NORTHERN TRUST CORP
S-3/A, 1997-01-06
STATE COMMERCIAL BANKS
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<PAGE>
 
    
 AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 3, 1997     
     
  REGISTRATION NOS. 333-18951, 333-18951-01, 333-18951-02 AND 333-18951-03     
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
                               ----------------
                                
                             AMENDMENT NO. 1     
                                       
                                    TO     
                                   FORM S-3
                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933
                               ----------------       NTC CAPITAL I
                                                     NTC CAPITAL II
 
                                                     NTC CAPITAL III
     NORTHERN TRUST CORPORATION             (EXACT NAME OF EACH REGISTRANT AS
                                            SPECIFIED IN ITS TRUST AGREEMENT)
    (EXACT NAME OF REGISTRANT AS
      SPECIFIED IN ITS CHARTER)
              DELAWARE                                  DELAWARE
                                             (STATE OR OTHER JURISDICTION OF
    (STATE OR OTHER JURISDICTION            INCORPORATION OR ORGANIZATION OF
  OFINCORPORATION OR ORGANIZATION)                  EACH REGISTRANT)
             36-2723087                          EACH TO BE APPLIED FOR
                                          (I.R.S. EMPLOYER IDENTIFICATION NO.)
(I.R.S. EMPLOYER IDENTIFICATION NO.)
 
                                             C/O NORTHERN TRUST CORPORATION
     FIFTY SOUTH LASALLE STREET                FIFTY SOUTH LASALLE STREET
       CHICAGO, ILLINOIS 60675                   CHICAGO, ILLINOIS 60675
           (312) 630-6000                            (312) 630-6000
                                            (ADDRESS, INCLUDING ZIP CODE, AND
  (ADDRESS, INCLUDING ZIP CODE, AND         TELEPHONE NUMBER, INCLUDING AREA
  TELEPHONE NUMBER, INCLUDING AREA        CODE, OF EACH REGISTRANT'S PRINCIPAL
   CODE, OF REGISTRANT'S PRINCIPAL                 EXECUTIVE OFFICES)
         EXECUTIVE OFFICES)
                               ----------------
                               PETER L. ROSSITER
                           EXECUTIVE VICE PRESIDENT,
                         GENERAL COUNSEL AND SECRETARY
                          NORTHERN TRUST CORPORATION
                          FIFTY SOUTH LASALLE STREET
                            CHICAGO, ILLINOIS 60675
                              TEL: (312) 444-3716
                              FAX: (312) 630-1596
           (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
         INCLUDING AREA CODE, OF AGENT FOR SERVICE OF EACH REGISTRANT)
                                WITH COPIES TO:
          ROBERT J. MINKUS                          MICHAEL M. MANEY
        SCHIFF HARDIN & WAITE                      SULLIVAN & CROMWELL
          7200 SEARS TOWER                          125 BROAD STREET
       CHICAGO, ILLINOIS 60606                  NEW YORK, NEW YORK 10004
         TEL: (312) 258-5500                       TEL: (212) 558-4000
         FAX: (312) 258-5600                       FAX: (212) 558-3588
                               ----------------
  APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: from time
to time after the Registration Statement becomes effective.
                               ----------------
  If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the
following box. [_]
  If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or
interest reinvestment plans, check the following box. [X]
  If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following
box and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [_]
  If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration number of the earlier effective registration statement for the
same offering. [_]
  If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [_]
                               ----------------
  THE REGISTRANTS HEREBY AMEND THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANTS
SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS
REGISTRATION STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH
SECTION 8(A) OF THE SECURITIES ACT OF 1933 OR UNTIL THIS REGISTRATION
STATEMENT SHALL BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING
PURSUANT TO SAID SECTION 8(A), MAY DETERMINE.
       
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>
 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A         +
+REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE   +
+SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY  +
+OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT        +
+BECOMES EFFECTIVE. NEITHER THIS PROSPECTUS SUPPLEMENT NOR THE PROSPECTUS TO   +
+WHICH IT RELATES SHALL CONSTITUTE AN OFFER TO SELL OR THE SOLICITATION OF AN  +
+OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE SECURITIES IN ANY STATE IN  +
+WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR TO             +
+REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.    +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                  
               SUBJECT TO COMPLETION, DATED JANUARY 3, 1997     
           PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JANUARY   , 1997
                                  $150,000,000
                                 NTC CAPITAL I
                         % PREFERRED SECURITIES, SERIES A
                (LIQUIDATION AMOUNT $25 PER PREFERRED SECURITY)
         FULLY AND UNCONDITIONALLY GUARANTEED, AS DESCRIBED HEREIN, BY
 
                           NORTHERN TRUST CORPORATION
 
                                  -----------
   
  The     % Preferred Securities, Series A (the "Series A Preferred
Securities"), offered hereby represent beneficial interests in NTC Capital I, a
statutory business trust created under the laws of the State of Delaware (the
"Series A Issuer"). Northern Trust Corporation, a Delaware corporation (the
"Corporation"), will be the owner of all of the beneficial interests
represented by common securities of the Series A Issuer ("Series A Common
Securities" and, collectively with the     
 
                                                        (Continued on next page)
 
                                  -----------
 
  SEE "RISK FACTORS" BEGINNING ON PAGE S-5 HEREOF FOR CERTAIN INFORMATION
RELEVANT TO AN INVESTMENT IN THE SERIES A PREFERRED SECURITIES.
 
                                  -----------
 
THESE SECURITIES ARE  NOT DEPOSITS OR OTHER  OBLIGATIONS OF A BANK  AND ARE NOT
 INSURED  BY  THE   FEDERAL  DEPOSIT   INSURANCE  CORPORATION   OR  ANY  OTHER
 GOVERNMENTAL AGENCY.
 
                                  -----------
 
THESE SECURITIES  HAVE NOT BEEN APPROVED  OR DISAPPROVED BY THE  SECURITIES AND
EXCHANGE  COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE  SECURITIES
 AND EXCHANGE  COMMISSION OR ANY  STATE SECURITIES COMMISSION PASSED  UPON THE
 ACCURACY  OR ADEQUACY  OF  THIS PROSPECTUS  SUPPLEMENT OR  THE PROSPECTUS  TO
  WHICH IT RELATES. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
                                  -----------
 
<TABLE>   
<CAPTION>
                                                                   PROCEEDS TO
                                      INITIAL PUBLIC UNDERWRITING  THE SERIES A
                                      OFFERING PRICE COMMISSION(1) ISSUER(2)(3)
                                      -------------- ------------- ------------
<S>                                   <C>            <C>           <C>
Per Preferred Security...............      $              $   (2)      $
Total................................     $              $    (2)     $
</TABLE>    
- -----
(1) The Series A Issuer and the Corporation have each agreed to indemnify the
    several Underwriters against certain liabilities, including liabilities
    under the Securities Act of 1933, as amended. See "Underwriting."
(2) In view of the fact that the proceeds of the sale of the Series A Preferred
    Securities will be invested in the Series A Subordinated Debentures, the
    Corporation has agreed to pay to the Underwriters as compensation
    ("Underwriters' Compensation") for their arranging the investment therein
    of such proceeds $    per Series A Preferred Security (or $    in the
    aggregate). See "Underwriting."
   
(3) Expenses of the offering which are payable by the Corporation are estimated
    to be $       .     
 
                                  -----------
 
  The Series A Preferred Securities offered hereby are offered severally by the
Underwriters, as specified herein, subject to receipt and acceptance by them
and subject to their right to reject any order in whole or in part. It is
expected that the Series A Preferred Securities will be ready for delivery in
book-entry form only through the facilities of The Depository Trust Company in
New York, New York, on or about January   , 1997, against payment therefor in
immediately available funds.
 
                                  -----------
 
           The date of this Prospectus Supplement is January  , 1997.
<PAGE>
 
  IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE SERIES A
PREFERRED SECURITIES AT A LEVEL ABOVE THAT WHICH MIGHT OTHERWISE PREVAIL IN
THE OPEN MARKET. SUCH TRANSACTIONS MAY BE EFFECTED ON THE NASDAQ STOCK MARKET
OR OTHERWISE. SUCH STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
 
                               ----------------
 
(cover page continued)
 
Series A Preferred Securities, the "Series A Securities"). The First National
Bank of Chicago is the Property Trustee of the Series A Issuer. The Series A
Issuer exists for the sole purpose of issuing the Series A Securities and
investing the proceeds thereof in $154,639,200 initial principal amount of  %
Junior Subordinated Deferrable Interest Debentures, Series A (the "Series A
Subordinated Debentures"), to be issued by the Corporation. The Series A
Subordinated Debentures will mature on      , 2027, which date may be (i)
shortened to a date not earlier than      , 2002 or (ii) extended to a date
not later than      , 2046, in each case if certain conditions are met. The
Corporation has committed to the Board of Governors of the Federal Reserve
System (the "Federal Reserve") not to exercise its right to shorten the Stated
Maturity of the Series A Subordinated Debentures without having received the
prior approval of the Federal Reserve to do so, if then required under
applicable Federal Reserve capital guidelines or policies. The Series A
Preferred Securities will have a preference under certain circumstances with
respect to cash distributions and amounts payable on liquidation, redemption
or otherwise over the Series A Common Securities. See "Description of
Preferred Securities--Subordination of Common Securities" in the accompanying
Prospectus.
 
  Holders of the Series A Preferred Securities will be entitled to receive
preferential cumulative cash distributions accruing from the date of original
issuance and payable quarterly in arrears on the last day of March, June,
September and December of each year, commencing March 31, 1997, at the annual
rate of  % of the Liquidation Amount of $25 per Series A Preferred Securities
("Distributions"). Subject to certain exceptions, as described herein, the
Corporation has the right to defer payment of interest on the Series A
Subordinated Debentures at any time or from time to time for a period not
exceeding 20 consecutive quarters with respect to each deferral period (each,
an "Extension Period"), provided that no Extension Period may extend beyond
the Stated Maturity of the Series A Subordinated Debentures. Upon the
termination of any such Extension Period and the payment of all interest then
accrued and unpaid (together with interest thereon at the rate of   % per
annum, compounded quarterly, to the extent permitted by applicable law), the
Corporation may elect to begin a new Extension Period subject to the
requirements set forth herein. If interest payments on the Series A
Subordinated Debentures are so deferred, Distributions on the Series A
Preferred Securities will also be deferred and the Corporation will not be
permitted, subject to certain exceptions described herein, to declare or pay
any cash distributions with respect to the Corporation's capital stock or debt
securities that rank pari passu with or junior to the Series A Subordinated
Debentures. During an Extension Period, interest on the Series A Subordinated
Debentures will continue to accrue (and the amount of Distributions to which
holders of the Series A Preferred Securities are entitled will accumulate) at
the rate of  % per annum, compounded quarterly from the relevant payment date
for such interest, and holders of Series A Preferred Securities will be
required to accrue interest income for United States federal income tax
purposes. See "Certain Terms of Series A Subordinated Debentures--Option to
Defer Interest Payments" and "Certain Federal Income Tax Consequences--
Interest Income and Original Issue Discount."
   
  The Series A Subordinated Debentures are unsecured and subordinate and
junior in right of payment to all Senior Debt (as defined in the accompanying
Prospectus) of the Corporation. Substantially all of the Corporation's
existing indebtedness constitutes Senior Debt; as of September 30, 1996, the
Corporation had approximately $289 million aggregate principal amount of
Senior Debt outstanding. Because the Corporation is a holding company, the
right of the Corporation to participate in any distribution of assets of any
subsidiary, including The Northern Trust Company (the "Bank"), upon such
subsidiary's liquidation or reorganization or otherwise (and thus the ability
of holders of the Series A Preferred Securities to benefit indirectly from
such distribution) is subject to the prior claims of creditors of that
subsidiary, except to the extent that the Corporation     
 
                                      S-2
<PAGE>
 
(cover page continued)
 
may itself be recognized as a creditor of that subsidiary. Accordingly, the
Series A Subordinated Debentures (and therefore the Series A Preferred
Securities) will be effectively subordinated to all existing and future
liabilities of the Corporation's subsidiaries, and holders thereof should look
only to the assets of the Corporation for payments on the Series A
Subordinated Debentures. See "Description of Junior Subordinated Debentures--
Subordination" in the accompanying Prospectus.
 
  The Corporation has, through the Series A Guarantee, the Trust Agreement,
the Series A Subordinated Debentures, the Indenture and the Expense Agreement
(each as defined herein), taken together, fully, irrevocably and
unconditionally guaranteed all of the Series A Issuer's obligations under the
Series A Preferred Securities. See "Relationship Among the Preferred
Securities, the Corresponding Junior Subordinated Debentures, the Expense
Agreement and the Guarantees--Full and Unconditional Guarantee" in the
accompanying Prospectus. The Series A Guarantee of the Corporation guarantees
the payment of Distributions and payments on liquidation or redemption of the
Series A Preferred Securities, but only in each case to the extent of funds
held by the Series A Issuer, as described herein (the "Series A Guarantee").
See "Description of Guarantees" in the accompanying Prospectus. If the
Corporation does not make interest payments on the Series A Subordinated
Debentures held by the Series A Issuer, the Series A Issuer will have
insufficient funds to pay Distributions on the Series A Preferred Securities.
The Series A Guarantee does not cover payment of Distributions when the Series
A Issuer has insufficient funds to pay such Distributions. In such event, a
holder of Series A Preferred Securities may institute a legal proceeding
directly against the Corporation pursuant to the terms of the Indenture to
enforce payment of amounts equal to such Distributions to such holder. See
"Description of Junior Subordinated Debentures--Enforcement of Certain Rights
By Holders of Preferred Securities" in the accompanying Prospectus. The
obligations of the Corporation under the Series A Guarantee and the Series A
Preferred Securities are subordinate and junior in right of payment to all
Senior Debt of the Corporation.
 
  The Series A Preferred Securities are subject to mandatory redemption, in
whole or in part, upon repayment of the Series A Subordinated Debentures at
maturity or their earlier redemption. The Series A Subordinated Debentures are
redeemable prior to maturity at the option of the Corporation (i) on or after
     , 2002, in whole at any time or in part from time to time, or (ii) at any
time prior to      , 2002, in whole (but not in part), at any time within 90
days following the occurrence and continuation of a Tax Event or a Capital
Treatment Event (each as defined herein), in each case at a redemption price
equal to 100% of the principal amount of the Series A Subordinated Debentures
so redeemed plus accrued and unpaid interest thereon to the date fixed for
redemption. See "Certain Terms of Series A Preferred Securities--Redemption."
The Corporation has committed to the Federal Reserve that it will not exercise
its right to redeem the Series A Subordinated Debentures prior to the Stated
Maturity without having received the prior approval of the Federal Reserve to
do so, if then required under applicable Federal Reserve capital guidelines or
policies.
   
  The Corporation will have the right at any time to terminate the Series A
Issuer and, after satisfaction of liabilities to creditors of the Series A
Issuer as required by applicable law, cause the Series A Subordinated
Debentures to be distributed to the holders of the Series A Preferred
Securities in liquidation of the Series A Issuer. The Corporation has
committed to the Federal Reserve that, so long as the Corporation (or any
affiliate) is a holder of Series A Common Securities, it will not so terminate
the Series A Issuer without having received the prior approval of the Federal
Reserve to do so, if then required under applicable Federal Reserve capital
guidelines or policies. See "Certain Terms of Series A Preferred Securities--
Liquidation of Series A Issuer and Distribution of Series A Subordinated
Debentures to Holders."     
 
  In the event of the termination of the Series A Issuer, after satisfaction
of liabilities to creditors of the Series A Issuer as required by applicable
law, the holders of the Series A Preferred Securities will be entitled to
receive a Liquidation Amount of $25 per Series A Preferred Security plus
accumulated and unpaid Distributions thereon to the date of payment, which may
be in the form of a distribution of such amount in Series A Subordinated
Debentures, subject to certain exceptions. See "Description of Preferred
Securities--Liquidation Distribution Upon Termination" in the accompanying
Prospectus.
 
 
                                      S-3
<PAGE>
 
(cover page continued)
 
  Application has been made to list the Series A Preferred Securities on the
Nasdaq Stock Market under the symbol "  ". If the Series A Subordinated
Debentures are distributed to the holders of Series A Preferred Securities
upon the liquidation of the Series A Issuer, the Corporation will use its best
efforts to list the Series A Subordinated Debentures on the Nasdaq Stock
Market or such stock exchanges or other automated quotation systems, if any,
on which the Series A Preferred Securities are then listed or traded.
 
  The Series A Preferred Securities will be represented by global certificates
registered in the name of The Depository Trust Company ("DTC") or its nominee.
Beneficial interests in the Series A Preferred Securities will be shown on,
and transfers thereof will be effected only through, records maintained by
participants in DTC. Except as described in the accompanying Prospectus,
Series A Preferred Securities in certificated form will not be issued in
exchange for the global certificates. See "Book-Entry Issuance" in the
accompanying Prospectus.
   
  The information in this Prospectus Supplement supplements and should be read
in conjunction with the information contained in the accompanying Prospectus.
As used herein, (i) the "Indenture" means the Junior Subordinated Indenture,
as amended and supplemented from time to time, between the Corporation and The
First National Bank of Chicago, as trustee (the "Debenture Trustee"), and (ii)
the "Trust Agreement" means the Amended and Restated Trust Agreement relating
to the Series A Issuer among the Corporation, as Depositor, The First National
Bank of Chicago, as Property Trustee (the "Property Trustee"), First Chicago
Delaware Inc., as Delaware Trustee (the "Delaware Trustee"), the
Administrative Trustees named therein (collectively, with the Property Trustee
and Delaware Trustee, the "Issuer Trustees") and the holders from time to time
of undivided beneficial interests of the Series A Issuer. Each of the other
capitalized terms used in this Prospectus Supplement and not otherwise defined
in this Prospectus Supplement has the meaning set forth in the accompanying
Prospectus.     
 
                                      S-4
<PAGE>
 
                                 RISK FACTORS
 
  Prospective purchasers of the Series A Preferred Securities should carefully
review the information contained elsewhere in this Prospectus Supplement and
in the accompanying Prospectus and should particularly consider the following
matters. In addition, because holders of Series A Preferred Securities may
receive Series A Subordinated Debentures in exchange therefor upon liquidation
of the Series A Issuer, prospective purchasers of Series A Preferred
Securities are also making an investment decision with regard to the Series A
Subordinated Debentures and should carefully review all the information
regarding the Series A Subordinated Debentures contained herein.
 
RANKING OF SUBORDINATED OBLIGATIONS UNDER THE SERIES A GUARANTEE AND THE
SERIES A SUBORDINATED DEBENTURES
   
  The obligations of the Corporation under the Series A Guarantee issued by
the Corporation for the benefit of the holders of Series A Preferred
Securities and under the Series A Subordinated Debentures are unsecured and
rank subordinate and junior in right of payment to all Senior Debt of the
Corporation. Substantially all of the Corporation's existing indebtedness
constitutes Senior Debt; as of September 30, 1996, the Corporation had
approximately $289 million aggregate principal amount of Senior Debt
outstanding. Because the Corporation is a holding company, the right of the
Corporation to participate in any distribution of assets of any subsidiary,
including the Bank, upon such subsidiary's liquidation or reorganization or
otherwise (and thus the ability of holders of the Series A Preferred
Securities to benefit indirectly from such distribution), is subject to the
prior claims of creditors of that subsidiary, except to the extent that the
Corporation may itself be recognized as a creditor of that subsidiary.
Accordingly, the Series A Subordinated Debentures will be effectively
subordinated to all existing and future liabilities of the Corporation's
subsidiaries, and holders of Series A Subordinated Debentures should look only
to the assets of the Corporation for payments on the Series A Subordinated
Debentures. See "The Corporation." None of the Indenture, the Series A
Guarantee, the Trust Agreement or the Expense Agreement places any limitation
on the amount of secured or unsecured debt, including Senior Debt, that may be
incurred by the Corporation. See "Description of Guarantees--Status of the
Guarantees" and "Description of Junior Subordinated Debentures--Subordination"
in the accompanying Prospectus.     
 
  The ability of the Series A Issuer to pay amounts due on the Series A
Preferred Securities is solely dependent upon the Corporation making payments
on the Series A Subordinated Debentures as and when required.
 
OPTION TO EXTEND INTEREST PAYMENT PERIOD; TAX CONSEQUENCES
 
  So long as no event of default under the Indenture has occurred or is
continuing, the Corporation has the right under the Indenture to defer payment
of interest on the Series A Subordinated Debentures at any time or from time
to time for a period not exceeding 20 consecutive quarters with respect to
each Extension Period, provided that no Extension Period may extend beyond the
Stated Maturity of the Series A Subordinated Debentures. As a consequence of
any such deferral, quarterly Distributions on the Series A Preferred
Securities by the Series A Issuer will also be deferred (and the amount of
Distributions to which holders of the Series A Preferred Securities are
entitled will accumulate additional Distributions thereon at the rate of  %
per annum, compounded quarterly from the relevant payment date for such
Distributions) during any such Extension Period. During any such Extension
Period, the Corporation may not (i) declare or pay any dividends or
distributions on, or redeem, purchase or acquire, or make a liquidation
payment with respect to, any of the Corporation's capital stock or (ii) make
any payment of principal of or interest or premium, if any, on or repay,
repurchase or redeem any debt securities of the Corporation that rank pari
passu in all respects with or junior in interest to the Series A Subordinated
Debentures (other than (a) repurchases, redemptions or other acquisitions of
shares of capital stock of the Corporation in connection with any employment
contract, benefit plan or other similar arrangement with or for the benefit of
one or more employees, officers, directors or consultants, in connection with
a dividend reinvestment or stockholder stock purchase plan or in connection
with the issuance of capital stock of the Corporation (or securities
convertible into or exercisable for such capital stock) as consideration in an
acquisition transaction entered into prior to the applicable Extension Period,
(b) as a result of any exchange or conversion of
 
                                      S-5
<PAGE>
 
any class or series of the Corporation's capital stock (or any capital stock
of a subsidiary of the Corporation) for any class or series of the
Corporation's capital stock or of any class or series of the Corporation's
indebtedness for any class or series of the Corporation's capital stock, (c)
the purchase of fractional interests in shares of the Corporation's capital
stock pursuant to the conversion or exchange provisions of such capital stock
or the security being converted or exchanged, (d) any declaration of a
dividend in connection with any stockholder rights plan, or the issuance of
rights, stock or other property under any stockholder rights plan, or the
redemption or repurchase of rights pursuant thereto, or (e) any dividend in
the form of stock, warrants, options or other rights where the dividend stock
or the stock issuable upon exercise of such warrants, options or other rights
is the same stock as that on which the dividend is being paid or ranks pari
passu with or junior to such stock). Prior to the termination of any such
Extension Period, the Corporation may further defer the payment of interest,
provided that no Extension Period may exceed 20 consecutive quarters or extend
beyond the Stated Maturity of the Series A Subordinated Debentures. Upon the
termination of any Extension Period and the payment of all interest then
accrued and unpaid (together with interest thereon at the annual rate of  %,
compounded quarterly from the interest payment date for such interest, to the
extent permitted by applicable law), the Corporation may elect to begin a new
Extension Period subject to the above requirements. There is no limitation on
the number of times that the Corporation may elect to begin an Extension
Period. See "Certain Terms of Series A Preferred Securities--Distributions"
and "Certain Terms of Series A Subordinated Debentures--Option to Defer
Interest Payments."
 
  Should an Extension Period occur, a holder of Series A Preferred Securities
will be required to recognize income (in the form of original issue discount)
in respect of its pro rata share of the Series A Subordinated Debentures held
by the Series A Issuer for United States federal income tax purposes. As a
result, a holder of Series A Preferred Securities will be required to include
such income in gross income for United States federal income tax purposes in
advance of the receipt of cash attributable to such income, and will not
receive the cash related to such income from the Series A Issuer if the holder
disposes of the Series A Preferred Securities prior to the record date for the
payment of Distributions. See "Certain Federal Income Tax Consequences--
Interest Income and Original Issue Discount" and "--Sale or Redemption of
Series A Preferred Securities."
 
  The Corporation has no current intention of exercising its right to defer
payments of interest by extending the interest payment period on the Series A
Subordinated Debentures. However, should the Corporation elect to exercise
such right in the future, the market price of the Series A Preferred
Securities is likely to be affected. A holder that disposes of its Series A
Preferred Securities during an Extension Period, therefore, might not receive
the same return on its investment as a holder that continues to hold its
Series A Preferred Securities.
 
TAX EVENT OR CAPITAL TREATMENT EVENT--REDEMPTION
 
  Upon the occurrence and continuation of a Tax Event or a Capital Treatment
Event (whether occurring before or after           , 2002), the Corporation
has the right to redeem the Series A Subordinated Debentures in whole (but not
in part) prior to            , 2002 and within 90 days following the
occurrence and continuation of such Tax Event or Capital Treatment Event and
thereby cause a mandatory redemption of the Series A Preferred Securities
before, as well as after,            , 2002. The Corporation has committed to
the Federal Reserve that it will not exercise such right without having
received the prior approval of the Federal Reserve to do so, if then required
under applicable Federal Reserve capital guidelines or policies.
 
  A "Tax Event" means the receipt by the Series A Issuer of an opinion of
counsel experienced in such matters to the effect that, as a result of any
amendment to, or change (including any announced prospective change) in, the
laws (or any regulations thereunder) of the United States or any political
subdivision or taxing authority thereof or therein, or as a result of any
official administrative pronouncement or judicial decision interpreting or
applying such laws or regulations, which amendment or change is effective or
such pronouncement or decision is announced on or after the date of issuance
of the Series A Preferred Securities under the Trust Agreement, there is more
than an insubstantial risk that (i) the Series A Issuer is, or will be within
90 days of the date of such opinion, subject to United States federal income
tax with respect to income received or accrued on the Series A Subordinated
Debentures, (ii) interest payable by the Corporation on the
 
                                      S-6
<PAGE>
 
   
Series A Subordinated Debentures is not, or within 90 days of the date of such
opinion will not be, deductible by the Corporation, in whole or in part, for
United States federal income tax purposes, or (iii) the Series A Issuer is, or
will be within 90 days of the date of the opinion, subject to more than a de
minimis amount of other taxes, duties or other governmental charges.     
 
  A "Capital Treatment Event" means the reasonable determination by the
Corporation that, as a result of any amendment to, or change (including any
announced prospective change) in, the laws (or any regulations thereunder) of
the United States or any political subdivision thereof or therein, or as a
result of any official or administrative pronouncement or action or judicial
decision interpreting or applying such laws, rules or regulations, which
amendment or change is effective or which pronouncement, action or decision is
announced on or after the date of issuance of the Series A Preferred
Securities under the Trust Agreement, there is more than an insubstantial risk
that the Corporation will not be entitled to treat an amount equal to the
aggregate Liquidation Amount of the Series A Preferred Securities as "Tier 1"
capital (or the then equivalent thereof) for purposes of the capital adequacy
guidelines of the Federal Reserve, as then in effect and applicable to the
Corporation.
  See "Risk Factors--Possible Tax Law Changes Affecting the Series A Preferred
Securities" for a discussion of certain legislative proposals that, if
adopted, could give rise to a Tax Event, which may permit the Corporation to
cause a redemption of the Series A Preferred Securities prior to            ,
2002.
 
EXCHANGE OF SERIES A PREFERRED SECURITIES FOR SERIES A SUBORDINATED DEBENTURES
 
  The Corporation will have the right at any time to terminate the Series A
Issuer and after satisfaction of liabilities to creditors of the Series A
Issuer as required by applicable law cause the Series A Subordinated
Debentures to be distributed to the holders of the Series A Preferred
Securities in exchange therefor upon liquidation of the Series A Issuer. The
exercise of such right is subject to the Corporation having received the prior
approval of the Federal Reserve, if then required under applicable Federal
Reserve capital guidelines or policies. See "Certain Terms of Series A
Preferred Securities--Liquidation of Series A Issuer and Distribution of
Series A Subordinated Debentures to Holders."
 
  Under current United States federal income tax law and interpretations, a
distribution of the Series A Subordinated Debentures upon liquidation of the
Series A Issuer should not be a taxable event to holders of the Series A
Preferred Securities. However, if a tax event were to occur which would cause
the Series A Issuer to be subject to United States federal income tax with
respect to income received or accrued on the Series A Subordinated Debentures,
a distribution of the Series A Subordinated Debentures by the Series A Issuer
could be a taxable event to the Series A Issuer and the holders of the Series
A Preferred Securities. See "Certain Federal Income Tax Consequences--
Distribution of Series A Subordinated Debentures to Holders of Series A
Preferred Securities."
 
SHORTENING OF STATED MATURITY OF SERIES A SUBORDINATED DEBENTURES
 
  The Corporation will have the right at any time to shorten the maturity of
the Series A Subordinated Debentures to a date not earlier than      , 2002
and thereby cause the Series A Preferred Securities to be redeemed on such
earlier date. The Corporation has committed to the Federal Reserve that it
will not exercise such right without having received the prior approval of the
Federal Reserve to do so, if then required under applicable Federal Reserve
capital guidelines or policies.
 
EXTENSION OF STATED MATURITY OF SERIES A SUBORDINATED DEBENTURES
 
  The Corporation will also have the right to elect to extend the maturity of
the Series A Subordinated Debentures, whether or not the Series A Issuer is
liquidated and the Series A Subordinated Debentures are distributed to holders
of the Series A Preferred Securities, to a date or dates not later than the
49th anniversary of the initial issuance of the Series A Preferred Securities,
provided that the Corporation can extend the maturity
 
                                      S-7
<PAGE>
 
only if at the time such election is made and at the time of such extension
(i) the Corporation is not in bankruptcy, otherwise insolvent or in
liquidation, (ii) the Corporation is not in default in the payment of any
interest or principal on the Series A Subordinated Debentures, (iii) if the
Series A Issuer has not been liquidated, the Series A Issuer is not in arrears
on payments of Distributions on the Series A Preferred Securities and no
deferred Distributions are accumulated, (iv) the Series A Subordinated
Debentures are rated not less than BBB- by Standard & Poor's Ratings Services
("Standard & Poor's") or Baa3 by Moody's Investors Service, Inc. ("Moody's")
or the equivalent by any other nationally recognized statistical rating
organization and (v) after such extension, the Series A Subordinated
Debentures shall not have a remaining term to maturity of more than 30 years.
To the extent that the Stated Maturity of the Series A Subordinated Debentures
is extended at such time as the Series A Preferred Securities are outstanding,
the Series A Preferred Securities would remain outstanding until such extended
date or until redeemed at an earlier date.
 
MARKET PRICES
 
  There can be no assurance as to the market prices for Series A Preferred
Securities or Series A Subordinated Debentures that may be distributed in
exchange for Series A Preferred Securities upon liquidation of the Series A
Issuer. Accordingly, the Series A Preferred Securities that an investor may
purchase, whether pursuant to the offer made hereby or in the secondary
market, or the Series A Subordinated Debentures that a holder of Series A
Preferred Securities may receive on liquidation of the Series A Issuer, may
trade at a discount to the price that the investor paid to purchase the Series
A Preferred Securities offered hereby. As a result of the existence of the
Corporation's right to defer interest payments, the market price of the Series
A Preferred Securities (which represent preferred beneficial interests in the
Series A Issuer) may be more volatile than the market prices of other
securities on which original issue discount accrues that are not subject to
such deferrals. In addition, because the Corporation has the right (i) to
shorten the Stated Maturity of the Series A Subordinated Debentures (subject
to its commitment to the Federal Reserve not to do so without the Federal
Reserve's prior approval, if then required under applicable Federal Reserve
guidelines or policies) or (ii) to extend the maturity of the Series A
Subordinated Debentures (subject to the conditions described above), there can
be no assurance that the Corporation will not exercise its option to change
the maturity of the Series A Subordinated Debentures as permitted by the terms
thereof and of the Indenture. If the Corporation does exercise such option,
there can be no assurance that the shortening or extension of the maturity of
the Series A Subordinated Debentures will not have an adverse effect on the
market price of the Series A Preferred Securities. See "Certain Terms of
Series A Subordinated Debentures" herein and "Description of Junior
Subordinated Debentures--Corresponding Junior Subordinated Debentures" in the
accompanying Prospectus.
 
  Application has been made to list the Series A Preferred Securities on the
Nasdaq Stock Market. If the Series A Preferred Securities are not listed on
the Nasdaq Stock Market or another automated quotation system or national
securities exchange and the underwriters do not make a market for the
securities, the liquidity of the Series A Preferred Securities could be
adversely affected.
 
TRADING CHARACTERISTICS OF SERIES A PREFERRED SECURITIES
 
  The Series A Preferred Securities may trade at prices that do not fully
reflect the value of accrued but unpaid interest with respect to the
underlying Series A Subordinated Debentures. A holder of Series A Preferred
Securities that disposes of its Series A Preferred Securities between record
dates for payments of Distributions (and consequently does not receive a
Distribution from the Series A Issuer for the period prior to such
disposition) will nevertheless be required to include accrued but unpaid
interest on the Series A Subordinated Debentures through the date of
disposition in income as ordinary income and to add such amount to its
adjusted tax basis in the Series A Preferred Securities disposed of. Such
holder will recognize a capital loss to the extent the selling price (which
may not fully reflect the value of accrued but unpaid interest) is less than
its adjusted tax basis (which will include accrued but unpaid interest).
Subject to certain limited exceptions, capital losses cannot be applied to
offset ordinary income for United States federal income tax purposes. See
"Certain Federal Income Tax Consequences--Sale or Redemption of Series A
Preferred Securities."
 
                                      S-8
<PAGE>
 
RIGHTS UNDER THE SERIES A GUARANTEE; DIRECT ACTION
 
  The Series A Guarantee guarantees to the holders of the Series A Preferred
Securities the following payments, to the extent not paid by the Series A
Issuer: (i) any accumulated and unpaid Distributions required to be paid on
the Series A Securities, to the extent that the Series A Issuer has funds on
hand available therefor at such time, (ii) the redemption price with respect
to any Series A Securities called for redemption, to the extent that the
Series A Issuer has funds on hand available therefor at such time, and (iii)
upon a voluntary or involuntary dissolution, winding-up or liquidation of the
Series A Issuer (unless the Series A Subordinated Debentures are distributed
to holders of the Series A Securities), the lesser of (a) the aggregate of the
Liquidation Amount and all accumulated and unpaid Distributions to the date of
payment to the extent that the Series A Issuer has funds on hand available
therefor at such time and (b) the amount of assets of the Series A Issuer
remaining available for distribution to holders of the Series A Securities.
The Series A Guarantee will be qualified as an indenture under the Trust
Indenture Act of 1939, as amended (the "Trust Indenture Act"). The First
National Bank of Chicago will act as the indenture trustee under the Series A
Guarantee (the "Guarantee Trustee") for the purposes of compliance with the
Trust Indenture Act and will hold the Series A Guarantee for the benefit of
the holders of the Series A Preferred Securities. The First National Bank of
Chicago will also act as Debenture Trustee for the Series A Subordinated
Debentures and as Property Trustee under the Trust Agreement, and First
Chicago Delaware Inc. will act as Delaware Trustee under the Trust Agreement.
 
  The holders of not less than a majority in aggregate liquidation amount of
the Series A Securities have the right to direct the time, method and place of
conducting any proceeding for any remedy available to the Guarantee Trustee in
respect of the Series A Guarantee or to direct the exercise of any trust power
conferred upon the Guarantee Trustee under the Series A Guarantee. Any holder
of the Series A Securities may institute a legal proceeding directly against
the Corporation to enforce its rights under the Series A Guarantee without
first instituting a legal proceeding against the Series A Issuer, the
Guarantee Trustee or any other person or entity. If the Corporation were to
default on its obligation to pay amounts payable under the Series A
Subordinated Debentures, the Series A Issuer would lack funds for the payment
of Distributions or amounts payable on redemption of the Series A Securities
or otherwise, and, in such event, holders of the Series A Securities would not
be able to rely upon the Series A Guarantee for payment of such amounts.
Instead, in the event a Debenture Event of Default shall have occurred and be
continuing and such event is attributable to the failure of the Corporation to
pay interest on or principal of the Series A Subordinated Debentures on the
payment date on which such payment is due and payable, then a holder of Series
A Securities may institute a legal proceeding directly against the Corporation
for enforcement of payment to such holder of the principal of or interest on
such Series A Subordinated Debentures having a principal amount equal to the
aggregate Liquidation Amount of the Series A Securities of such holder (a
"Direct Action"). In connection with such Direct Action, the Corporation will
have a right of set-off under the Indenture to the extent of any payment made
by the Corporation to such holder of Series A Securities in the Direct Action.
Except as described herein, holders of Series A Securities will not be able to
exercise directly any other remedy available to the holders of the Series A
Subordinated Debentures or assert directly any other rights in respect of the
Series A Subordinated Debentures. See "Description of Junior Subordinated
Debentures--Enforcement of Certain Rights by Holders of Preferred Securities"
and "--Debenture Events of Default" and "Description of Guarantees" in the
accompanying Prospectus. The Trust Agreement provides that each holder of
Series A Preferred Securities by acceptance thereof agrees to the provisions
of the Series A Guarantee and the Indenture.
 
LIMITED VOTING RIGHTS
 
  Holders of Series A Preferred Securities generally will have limited voting
rights relating only to the modification of the Series A Preferred Securities
and the exercise of the Series A Issuer's rights as holder of Series A
Subordinated Debentures and the Series A Guarantee. Holders of Series A
Preferred Securities will not be entitled to vote to appoint, remove or
replace the Property Trustee, the Delaware Trustee or any Administrative
Trustee, which voting rights are vested exclusively in the holder of the
Series A Common Securities except, with respect to the Property Trustee and
the Delaware Trustee, upon the occurrence of certain events described in the
accompanying Prospectus. The Property Trustee, the Administrative Trustees and
the
 
                                      S-9
<PAGE>
 
Corporation may amend the Trust Agreement without the consent of holders of
Series A Preferred Securities to ensure that the Series A Issuer will be
classified for United States federal income tax purposes as a grantor trust or
as other than an association taxable as a corporation unless such action
materially adversely affects the interests of such holders. See "Description
of Preferred Securities--Voting Rights; Amendment of Each Trust Agreement" and
"--Removal of Issuer Trustees" in the accompanying Prospectus.
 
POSSIBLE TAX LAW CHANGES AFFECTING THE SERIES A PREFERRED SECURITIES
 
  On March 19, 1996, the Revenue Reconciliation Bill of 1996 (the "Revenue
Reconciliation Bill"), the revenue portion of President Clinton's budget
proposal, was introduced in the 104th Congress. If enacted, the Revenue
Reconciliation Bill would have generally denied interest deductions for
interest on an instrument issued by a corporation that has a maximum term of
more than 20 years and that is not shown as indebtedness on the separate
balance sheet of the issuer or, where the instrument is issued to a related
party (other than a corporation), where the holder or some other related party
issues a related instrument that is not shown as indebtedness on the issuer's
consolidated balance sheet. For purposes of determining the weighted average
maturity or the term of an instrument, any right to extend would be treated as
exercised. The above-described provisions of the Revenue Reconciliation Bill
were proposed to be effective generally for instruments issued on or after
December 7, 1995. If the proposed provision had applied to the Series A
Subordinated Debentures, the Corporation would have been unable to deduct
interest on the Series A Subordinated Debentures. However, on March 29, 1996,
the Chairmen of the Senate Finance and House Ways and Means Committees issued
a joint statement to the effect that it was their intention that the effective
date of the President's legislative proposals, if adopted, would be no earlier
than the date of appropriate Congressional action. The 104th Congress
adjourned without enacting the above-described provisions of the Revenue
Reconciliation Bill, and under current law, the Corporation will be able to
deduct interest on the Series A Subordinated Debentures.
 
  Although the above-described provisions of the Revenue Reconciliation Bill
were not enacted in 1996, there can be no assurance that current or future
legislative proposals or final legislation will not affect the ability of the
Corporation to deduct interest on the Series A Subordinated Debentures. Such a
change could give rise to a Tax Event, which may permit the Corporation to
cause a redemption of the Series A Preferred Securities before         , 2002.
See "Certain Terms of Series A Subordinated Debentures--Redemption" herein and
"Description of Preferred Securities--Redemption or Exchange--Mandatory
Redemption--Tax Event or Capital Treatment Event Redemption" in the
accompanying Prospectus. See also "Certain Federal Income Tax Consequences--
Possible Tax Law Changes."
 
                                 NTC CAPITAL I
   
  NTC Capital I is a statutory business trust created under Delaware law
pursuant to (i) the Trust Agreement of the Series A Issuer dated as of
December 27, 1996 and (ii) the certificate of trust filed with the Delaware
Secretary of State on December 27, 1996. The Series A Issuer's business and
affairs are conducted by the Issuer Trustees: The First National Bank of
Chicago, as Property Trustee, and First Chicago Delaware Inc., as Delaware
Trustee, and two individual Administrative Trustees who are employees or
officers of or affiliated with the Corporation. The Series A Issuer exists for
the exclusive purposes of (i) issuing and selling the Series A Securities,
(ii) using the proceeds from the sale of Series A Securities to acquire Series
A Subordinated Debentures issued by the Corporation and (iii) engaging in only
those other activities necessary or incidental thereto (such as registering
the transfer of the Series A Preferred Securities). Accordingly, the Series A
Subordinated Debentures will be the sole assets of the Series A Issuer, and
payments under the Series A Subordinated Debentures will be the sole revenue
of the Series A Issuer. All of the Series A Common Securities will be owned by
the Corporation. The Series A Common Securities will rank pari passu, and
payments will be made thereon pro rata, with the Series A Preferred
Securities, except that upon the occurrence and continuance of an event of
default under the Trust Agreement resulting from an Event of Default under the
Indenture, the rights of the Corporation, as holder of the Series A Common
Securities, to payment in respect of Distributions and payments upon
liquidation, redemption or otherwise will be subordinated to the rights of the
holders of the     
 
                                     S-10
<PAGE>
 
Series A Preferred Securities. See "Description of Preferred Securities--
Subordination of Common Securities" in the accompanying Prospectus. The
Corporation will acquire Series A Common Securities in an aggregate
liquidation amount equal to 3% of the total capital of the Series A Issuer.
The Series A Issuer has a term of 55 years, but may terminate earlier as
provided in the Trust Agreement. The principal executive office of the Series
A Issuer is Fifty South LaSalle Street, Chicago, Illinois 60675, Attention:
Secretary, and its telephone number is (312) 630-6000. See "The Issuers" in
the accompanying Prospectus.
 
  It is anticipated that the Series A Issuer will not be subject to the
reporting requirements under the Securities Exchange Act of 1934, as amended
(the "Exchange Act").
 
                                THE CORPORATION
 
  Northern Trust Corporation is a bank holding company within the meaning of
the Bank Holding Company Act of 1956, as amended. The Corporation was
organized in Delaware in 1971 and that year became the owner of all of the
outstanding capital stock (except directors' qualifying shares) of the Bank,
the Corporation's principal banking subsidiary. At September 30, 1996, the
Corporation owned, in addition to the Bank, one bank in each of Arizona,
California, Florida and Texas, trust companies in Connecticut and New York and
various other non-bank subsidiaries, including a securities brokerage firm, a
retirement services company and a futures commission merchant. In November
1996, the Corporation acquired Bent Tree National Bank and its parent,
Metroplex Bancshares, Inc., of Dallas, Texas, for $14.6 million in cash.
 
  The Bank was founded by Byron L. Smith in 1869 to provide banking and trust
services to the public. Currently in its one hundred and seventh year, the
Bank's growth has come primarily from internal sources rather than through
merger or acquisition. At September 30, 1996, the Bank had consolidated assets
of approximately $18.2 billion. At June 30, 1996, the Bank was the third
largest bank in Illinois and the 33rd largest in the United States, based on
consolidated total assets of approximately $18.6 billion on that date.
 
  The Corporation expects that, although the operations of other subsidiaries
will be of increasing significance, the Bank will in the foreseeable future
continue to be the major source of the Corporation's assets, revenues and net
income. At September 30, 1996, the Corporation had consolidated total assets
of $21.3 billion and stockholders' equity of $1.5 billion. At September 30,
1996, the Corporation was the second largest bank holding company
headquartered in Illinois and the 34th largest in the United States, based on
consolidated total assets of $21.4 billion on that date.
 
  The Corporation provides client services through two principal business
units: Corporate and Institutional Services and Personal Financial Services.
The Worldwide Operations and Technology business unit encompasses all trust
and banking operations and systems activities to support the two principal
business units. The Investment Services Group provides investment management
services to corporate and institutional clients, as well as to personal
clients. The Risk Management business unit oversees financial, interest rate
and credit risk throughout the Corporation.
 
CORPORATE AND INSTITUTIONAL SERVICES
 
  Corporate and Institutional Services ("C&IS") provides trust, commercial
banking and treasury management services to corporate and institutional
clients. Trust activities encompass trust and custody services for owners of
securities in the United States and foreign markets, as well as securities
lending, asset management and related cash management services. Services with
respect to securities traded in markets foreign to the client are provided
primarily through the Bank's London Branch. Related foreign exchange services
are rendered at the London and Singapore Branches as well as in Chicago.
 
  A full range of commercial banking services is offered through the Bank,
which places special emphasis on developing institutional relationships in two
target markets: large domestic corporations and financial institutions
 
                                     S-11
<PAGE>
 
(both domestic and international). Treasury management services are provided
to corporations and financial institutions and include a variety of products
and services to accelerate cash collections, control disbursements outflows
and generate information to manage cash positions.
 
  The Corporation provides retirement benefit plan services for C&IS clients
through its subsidiary Northern Trust Retirement Consulting, Inc., located in
Atlanta, Georgia. Northern Trust Global Advisors, Inc., located in Stamford,
Connecticut, is an international provider of institutional investment
management services and the parent of RCB Trust Company.
 
PERSONAL FINANCIAL SERVICES
 
  Services to individuals are another major dimension of the Corporation's
trust business. Personal Financial Services ("PFS") encompasses personal
trust, estate administration, personal banking, mortgage lending and trust and
banking services to middle market companies. A key element of the personal
trust business is to provide private banking and trust services to targeted
high net worth individuals in rapidly growing areas of wealth concentration
through the Corporation's bank subsidiaries.
 
  The Bank operates sixteen offices in the Chicago metropolitan area. The
Corporation's Florida banking subsidiary, Northern Trust Bank of Florida N.A.,
headquartered in Miami, has twenty-two offices located throughout Florida,
with total assets of approximately $2.0 billion at September 30, 1996. The
Corporation's Arizona banking subsidiary, Northern Trust Bank of Arizona N.A.,
is headquartered in Phoenix, serves clients from six office locations and had
assets of approximately $369 million at September 30, 1996. The Corporation's
Texas banking subsidiary, Northern Trust Bank of Texas N.A., headquartered in
Dallas, had total assets of approximately $450 million at September 30, 1996.
With the acquisition of Bent Tree National Bank, the Corporation now has seven
office locations in Texas. The Corporation's California banking subsidiary,
Northern Trust Bank of California N.A., is headquartered in Santa Barbara. It
has six office locations and had total assets of approximately $409 million at
September 30, 1996.
 
WORLDWIDE OPERATIONS AND TECHNOLOGY
 
  Supporting all of the Corporation's business activities is the Worldwide
Operations and Technology Unit, which supports the sales, relationship
management, transaction processing and product management activities for C&IS
and PFS.
 
INVESTMENT SERVICES
 
  The Investment Services Group provides equity and fixed income research and
portfolio management services to clients of C&IS and PFS. The Group also acts
as the investment advisor to the Corporation's two families of mutual funds,
the Northern Funds and The Benchmark Funds.
 
RISK MANAGEMENT
 
  The Risk Management Unit includes the Treasury, Credit Policy and Controller
functions. The Treasury Department is responsible for managing the Bank's
wholesale funding and interest rate risk, as well as the portfolio of interest
rate risk management instruments under the direction of the Corporate Asset
and Liability Policy Committee. It is also responsible for the investment
portfolios of the Corporation and the Bank and provides investment advice and
management services to the subsidiary banks. Credit Policy is responsible for
credit risk management throughout the Corporation.
 
  The Corporation's principal executive offices are located at Fifty South
LaSalle Street, Chicago, Illinois 60675, and its telephone number is (312)
630-6000.
 
                                     S-12
<PAGE>
 
               CONSOLIDATED RATIOS OF EARNINGS TO FIXED CHARGES
 
  The following table sets forth the consolidated ratios of earnings to fixed
charges and ratios of earnings to fixed charges and preferred stock dividend
requirements for the Corporation for each of the years in the five-year period
ended December 31, 1995 and for the nine months ended September 30, 1996. For
purposes of computing these ratios, earnings represent net income, plus total
taxes based on income, plus fixed charges. Fixed charges include interest
expense (ratios are presented both excluding and including interest on
deposits), the estimated interest component of net rental expense and
amortization of debt expense. Pre-tax earnings required for preferred stock
dividends were computed using effective tax rates for the applicable year.
 
<TABLE>   
<CAPTION>
                                    NINE MONTHS
                                       ENDED        YEAR ENDED DECEMBER 31,
                                   SEPTEMBER 30, -----------------------------
                                       1996      1995  1994  1993  1992  1991
                                   ------------- ----- ----- ----- ----- -----
<S>                                <C>           <C>   <C>   <C>   <C>   <C>
Earnings to Fixed Charges:
  Including interest on deposits..     1.49x     1.42x 1.50x 1.60x 1.49x 1.28x
  Excluding interest on deposits..     2.14x     2.01x 2.14x 2.50x 2.54x 1.87x
Earnings to Fixed Charges and
 Preferred Stock Dividend
 Requirements:
  Including interest on deposits..     1.48x     1.41x 1.48x 1.58x 1.47x 1.27x
  Excluding interest on deposits..     2.12x     1.97x 2.09x 2.43x 2.45x 1.82x
</TABLE>    
 
                                USE OF PROCEEDS
 
  All of the proceeds from the sale of Series A Preferred Securities will be
invested by the Series A Issuer in Series A Subordinated Debentures. The
Corporation intends that the proceeds from the sale of such Series A
Subordinated Debentures will be added to its general corporate funds and will
be used for general corporate purposes.
 
  The Corporation is required by the Federal Reserve to maintain certain
levels of capital for bank regulatory purposes. On October 21, 1996, the
Federal Reserve announced that cumulative preferred securities having the
characteristics of the Series A Preferred Securities which qualify as a
minority interest could be included as "Tier 1" capital for bank holding
companies. See "Certain Regulatory Considerations--Capital Adequacy" in the
accompanying Prospectus. Such Tier 1 capital treatment, together with the
Corporation's ability to deduct, for income tax purposes, interest payable on
the Series A Subordinated Debentures, will provide the Corporation with a more
cost-effective means of obtaining capital for regulatory purposes than other
Tier 1 capital alternatives currently available to it.
 
                                     S-13
<PAGE>
 
                                CAPITALIZATION
 
  The following table sets forth the consolidated capitalization of the
Corporation and its subsidiaries as of September 30, 1996 and as adjusted to
give effect to the consummation of the offering of the Series A Preferred
Securities. The following data should be read in conjunction with the
consolidated financial statements and notes thereto of the Corporation and its
subsidiaries incorporated herein by reference.
 
<TABLE>   
<CAPTION>
                                                                 SEPTEMBER 30,
                                                                     1996
                                                                ----------------
                                                                           AS
                                                                ACTUAL  ADJUSTED
                                                                ------  --------
                                                                 (IN MILLIONS)
<S>                                                             <C>     <C>
Total Long-term Debt..........................................  $  437   $  437
                                                                ------   ------
Guaranteed Preferred Beneficial Interests in Corporation's Ju-
 nior Subordinated
 Deferrable Interest Debentures(a) ...........................     --       150
Stockholders' Equity
  Preferred Stock.............................................     120      120
  Common Stock................................................      95       95
  Capital Surplus.............................................     328      328
  Retained Earnings...........................................   1,064    1,064
  Common Stock Issuable--Performance Plan.....................      10       10
  Deferred Compensation.......................................     (37)     (37)
  Treasury Stock, at Cost.....................................     (63)     (63)
                                                                ------   ------
    Total Stockholders' Equity................................   1,517    1,517
                                                                ------   ------
      Total Capitalization....................................  $1,954   $2,104
                                                                ======   ======
</TABLE>    
 
  (a) As described herein, the sole assets of the Series A Issuer will be
$154,639,200 of   % Series A Subordinated Debentures, issued by the
Corporation to the Series A Issuer. The Series A Subordinated Debentures will
mature on      , 2027 which date may be shortened to a date not earlier than
     , 2002 or extended to a date not later than      , 2046 if certain
conditions are met. The Corporation owns all of the Series A Common Securities
of the Series A Issuer, which accrue distributions at the rate of   % per
annum.
 
                                     S-14
<PAGE>
 
                
             SUMMARY OF SELECTED CONSOLIDATED FINANCIAL DATA     
   
  The following summary is qualified in its entirety by the consolidated
financial statements and notes thereto of the Corporation and its subsidiaries
and the other information incorporated herein by reference. See "Incorporation
of Certain Documents by Reference" in the accompanying Prospectus. The results
for the nine months ended September 30, 1996 and September 30, 1995 are
unaudited but, in the opinion of management, all adjustments, consisting only
of normal recurring adjustments, necessary for a fair presentation of results
of operations for such periods have been included.     
 
<TABLE>   
<CAPTION>
                          NINE MONTHS ENDED
                            SEPTEMBER 30,             YEAR ENDED DECEMBER 31,
                          ----------------- --------------------------------------------
                            1996     1995     1995     1994     1993     1992     1991
                          -------- -------- -------- -------- -------- -------- --------
                                     (IN MILLIONS, EXCEPT PER SHARE AMOUNTS)
                             (UNAUDITED)
<S>                       <C>      <C>      <C>      <C>      <C>      <C>      <C>
Net Interest Income.....  $  287.7 $  265.9 $  357.6 $  334.6 $  327.9 $  310.3 $  281.1
Provision for Credit
 Losses.................      11.5      5.0      6.0      6.0     19.5     29.5     31.0
Noninterest Income
  Trust Fees............     440.3    371.4    505.0    453.4    404.8    368.4    303.1
  Other Noninterest
   Income...............     136.9    132.1    173.1    180.0    149.0    141.9    110.5
Noninterest Expenses....     566.9    530.7    709.2    700.5    628.2    584.6    500.1
Provision for Income
 Taxes..................      95.1     73.2    100.5     79.3     66.1     57.0     36.2
Net Income..............     191.4    160.5    220.0    182.2    167.9    149.5    127.4
Net Income Applicable to
 Common Stock...........     187.7    154.1    211.5    174.9    161.6    142.7    121.4
Per Common Share (a)
  Net Income--Primary...     1.635     1.37    1.875    1.585     1.48     1.32    1.145
  --Fully Diluted.......     1.625    1.355     1.85     1.58    1.475     1.32    1.135
  Dividends Declared....      .465      .39     .545      .46     .388     .333      .29
Average Total Assets....  20,956.3 19,113.7 19,409.5 17,885.8 15,700.2 13,418.0 12,182.5
Senior Notes and Notes
 Payable at Period End..     637.0    458.1    351.6    791.8  1,143.8    545.2    266.1
</TABLE>    
- --------
   
(a) Reflects a 2-for-1 split effected by means of a 100% stock distribution
    made on December 9, 1996 to stockholders of record on December 2, 1996.
        
                             ACCOUNTING TREATMENT
 
  For financial reporting purposes, the Series A Issuer will be treated as a
subsidiary of the Corporation and, accordingly, the accounts of the Series A
Issuer will be included in the consolidated financial statements of the
Corporation. The Series A Preferred Securities will be presented as a separate
line item in the consolidated balance sheets of the Corporation, entitled
"Guaranteed Preferred Beneficial Interests in Corporation's Junior
Subordinated Deferrable Interest Debentures" and appropriate disclosures about
the Series A Preferred Securities, the Series A Guarantee and the Series A
Subordinated Debentures will be included in the notes to the consolidated
financial statements. For financial reporting purposes, the Corporation will
record Distributions payable on the Series A Preferred Securities as an
expense (net of tax) in the consolidated statements of income.
 
  The Corporation has agreed that future financial reports of the Corporation
will: (i) present the Preferred Securities issued by other Issuer Trusts on
the Corporation's balance sheet as a separate line item entitled "Guaranteed
Preferred Beneficial Interests in Corporation's Junior Subordinated Deferrable
Interest Debentures"; (ii) include in a footnote to the financial statements
disclosure that the sole assets of the trusts are the Junior Subordinated
Debentures (specifying as to each trust the principal amount, interest rate
and maturity date of the Junior Subordinated Debentures held); and (iii) if
Staff Accounting Bulletin 53 treatment is sought, include in an audited
footnote to the financial statements disclosure that (a) the trusts are wholly
owned, (b) the sole assets of the trusts are the Junior Subordinated
Debentures (specifying as to each trust the principal amount, interest rate
and maturity date of the Junior Subordinated Debentures held), and (c) the
obligations of the Corporation under the Junior Subordinated Debentures and
the relevant Indenture, Trust Agreement, Guarantee and Expense Agreement, in
the aggregate, constitute a full and unconditional guarantee by the
Corporation of such trust's obligations under the preferred securities issued
by such trust.
 
                                     S-15
<PAGE>
 
                CERTAIN TERMS OF SERIES A PREFERRED SECURITIES
 
GENERAL
 
  The following summary of certain terms and provisions of the Series A
Preferred Securities supplements the description of the terms and provisions
of the Preferred Securities set forth in the accompanying Prospectus under the
heading "Description of Preferred Securities," to which description reference
is hereby made. This summary of certain terms and provisions of the Series A
Preferred Securities, which describes the material provisions thereof, does
not purport to be complete and is subject to, and qualified in its entirety by
reference to, the Trust Agreement, to which reference is hereby made. The form
of the Trust Agreement has been filed as an exhibit to the Registration
Statement of which this Prospectus Supplement and accompanying Prospectus form
a part.
 
DISTRIBUTIONS
   
  The Series A Preferred Securities represent beneficial interests in the
Series A Issuer, and Distributions on the Series A Preferred Securities will
be payable at the annual rate of  % of the stated Liquidation Amount of $25,
payable quarterly in arrears on March 31, June 30, September 30 and December
31 of each year (each a "Distribution Date"), to the holders of the Series A
Preferred Securities at the close of business on the fifteenth day (whether or
not a Business Day (as defined below)) next preceding the relevant
Distribution Date. Distributions will accumulate from the date of original
issuance. The first Distribution payment date for the Series A Preferred
Securities will be March 31, 1997. The amount of Distributions payable for any
period will be computed on the basis of a 360-day year of twelve 30-day
months. In the event that any date on which Distributions are payable on the
Series A Preferred Securities is not a Business Day, then payment of the
Distributions payable on such date will be made on the next succeeding day
that is a Business Day (and without any additional Distributions or other
payment in respect of any such delay), except that, if such Business Day is in
the next succeeding calendar year, such payment will be made on the
immediately preceding Business Day, in each case with the same force and
effect as if made on the date such payment was originally payable. The Paying
Agent for the Preferred Securities will be the Property Trustee. See
"Description of Preferred Securities--Distributions" in the accompanying
Prospectus.     
 
  So long as no event of default under the Indenture has occurred and is
continuing, the Corporation has the right under the Indenture to defer payment
of interest on the Series A Subordinated Debentures at any time or from time
to time for a period not exceeding 20 consecutive quarters with respect to
each Extension Period, provided that no Extension Period may extend beyond the
Stated Maturity of the Series A Subordinated Debentures. As a consequence of
any such deferral of interest payments by the Corporation, quarterly
Distributions on the Series A Preferred Securities will also be deferred by
the Series A Issuer during any such Extension Period. Distributions to which
holders of the Series A Preferred Securities are entitled will accumulate
additional Distributions thereon at the rate per annum of  % thereof,
compounded quarterly from the relevant payment date for such Distributions.
The term "Distributions" as used herein shall include any such additional
Distributions. During any such Extension Period, the Corporation may not (i)
declare or pay any dividends or distributions on, or redeem, purchase or
acquire, or make a liquidation payment with respect to, any of the
Corporation's capital stock or (ii) make any payment of principal of or
interest or premium, if any, on or repay, repurchase or redeem any debt
securities of the Corporation that rank pari passu in all respects with or
junior in interest to the Series A Subordinated Debentures (other than (a)
repurchases, redemptions or other acquisitions of shares of capital stock of
the Corporation in connection with any employment contract, benefit plan or
other similar arrangement with or for the benefit of one or more employees,
officers, directors or consultants, in connection with a dividend reinvestment
or stockholder stock purchase plan or in connection with the issuance of
capital stock of the Corporation (or securities convertible into or
exercisable for such capital stock) as consideration in an acquisition
transaction entered into prior to the applicable Extension Period, (b) as a
result of any exchange or conversion of any class or series of the
Corporation's capital stock (or any capital stock of a subsidiary of the
Corporation) for any class or series of the Corporation's capital stock or of
any class or series of the Corporation's indebtedness for any class or series
of the Corporation's capital stock, (c) the purchase of fractional interests
in shares of the Corporation's capital stock pursuant to the conversion or
exchange provisions of such capital stock or the security being converted or
exchanged, (d) any declaration of a dividend in connection with any
stockholder rights plan, or the issuance of rights, stock or other property
under any
 
                                     S-16
<PAGE>
 
stockholder rights plan, or the redemption or repurchase of rights pursuant
thereto, or (e) any dividend in the form of stock, warrants, options or other
rights where the dividend stock or the stock issuable upon exercise of such
warrants, options or other rights is the same stock as that on which the
dividend is being paid or ranks pari passu with or junior to such stock).
Prior to the termination of any such Extension Period, the Corporation may
further defer the payment of interest on the Series A Subordinated Debentures,
provided that no Extension Period may exceed 20 consecutive quarters or extend
beyond the Stated Maturity of the Series A Subordinated Debentures. Upon the
termination of any such Extension Period and the payment of all interest then
accrued and unpaid (together with interest thereon at the rate of   % per
annum, compounded quarterly, to the extent permitted by applicable law), the
Corporation may elect to begin a new Extension Period. There is no limitation
on the number of times that the Corporation may elect to begin an Extension
Period. See "Certain Terms of Series A Subordinated Debentures--Option to
Defer Interest Payments" and "Certain Federal Income Tax Consequences--
Interest Income and Original Issue Discount."
 
  The Corporation has no current intention of exercising its right to defer
payments of interest by extending the interest payment period on the Series A
Subordinated Debentures.
 
REDEMPTION
 
  Upon the repayment or redemption, in whole or in part, of the Series A
Subordinated Debentures, whether at Stated Maturity or upon earlier redemption
as provided in the Indenture, the proceeds from such repayment or redemption
shall be applied by the Property Trustee to redeem a Like Amount (as defined
in the accompanying Prospectus) of the Series A Securities, upon not less than
30 nor more than 60 days notice prior to the date fixed for repayment or
redemption, at a redemption price, with respect to the Series A Preferred
Securities (the "Redemption Price"), equal to the aggregate Liquidation Amount
of such Series A Preferred Securities plus accumulated and unpaid
Distributions thereon to the date of redemption (the "Redemption Date"). See
"Description of Preferred Securities--Redemption or Exchange" in the
accompanying Prospectus. For a description of the Stated Maturity and
redemption provisions of the Series A Subordinated Debentures, see "Certain
Terms of Series A Subordinated Debentures--General" and "--Redemption."
 
LIQUIDATION OF SERIES A ISSUER AND DISTRIBUTION OF SERIES A SUBORDINATED
DEBENTURES TO HOLDERS
   
  The Corporation will have the right at any time to liquidate the Series A
Issuer and, after satisfaction of liabilities to creditors of the Series A
Issuer as required by applicable law, cause the Series A Subordinated
Debentures to be distributed to the holders of the Series A Preferred
Securities in exchange therefor upon liquidation of the Series A Issuer. The
Corporation has committed to the Federal Reserve that, so long as the
Corporation (or any affiliate) is a holder of Series A Common Securities, the
Corporation will not exercise such right without having received the prior
approval of the Federal Reserve to do so, if then required under applicable
Federal Reserve capital guidelines or policies.     
 
  Under current United States Federal income tax law, a distribution of Series
A Subordinated Debentures in exchange for Series A Preferred Securities should
not be a taxable event to holders of the Series A Preferred Securities. Should
there be a change in law, a change in legal interpretation, a Tax Event or
other circumstances, however, the distribution of the Series A Subordinated
Debentures could be a taxable event to holders of the Series A Preferred
Securities. See "Certain Federal Income Tax Consequences--Distribution of
Series A Subordinated Debentures to Holders of Series A Preferred Securities."
If the Corporation elects neither to redeem the Series A Subordinated
Debentures prior to maturity nor to liquidate the Series A Issuer and
distribute the Series A Subordinated Debentures to holders of the Series A
Preferred Securities in exchange therefor, the Series A Preferred Securities
will remain outstanding until the Stated Maturity of the Series A Subordinated
Debentures.
 
  If the Corporation elects to liquidate the Series A Issuer and thereby
causes the Series A Subordinated Debentures to be distributed to holders of
the Series A Preferred Securities in exchange therefor upon liquidation of the
Series A Issuer, the Corporation shall continue to have the right to shorten
or extend the maturity of the Series A Subordinated Debentures, subject to
certain conditions as described under "Certain Terms of Series A Subordinated
Debentures--General."
 
                                     S-17
<PAGE>
 
LIQUIDATION VALUE
 
  The amount payable on the Series A Preferred Securities in the event of any
liquidation of the Series A Issuer is $25 per Series A Preferred Security plus
accumulated and unpaid Distributions, which may be in the form of a
distribution of a Like Amount in Series A Subordinated Debentures, subject to
certain exceptions. See "Description of Preferred Securities--Liquidation
Distribution Upon Termination" in the accompanying Prospectus.
 
REGISTRATION OF SERIES A PREFERRED SECURITIES
 
  The Series A Preferred Securities will be represented by global certificates
registered in the name of DTC or its nominee. Beneficial interests in the
Series A Preferred Securities will be shown on, and transfers thereof will be
effected only through, records maintained by Participants in DTC (as defined
in the accompanying Prospectus). Except as described below and in the
accompanying Prospectus, Series A Preferred Securities in certificated form
will not be issued in exchange for the global certificates. See "Book-Entry
Issuance" in the accompanying Prospectus.
 
  A global security shall be exchangeable for Series A Preferred Securities
registered in the names of persons other than DTC or its nominee only if (i)
DTC notifies the Series A Issuer that it is unwilling or unable to continue as
a depository for such global security and no successor depository shall have
been appointed, or if at any time DTC ceases to be a clearing agency
registered under the Exchange Act, at a time when DTC is required to be so
registered to act as such depository, (ii) the Series A Issuer in its sole
discretion determines that such global security shall be so exchangeable, or
(iii) there shall have occurred and be continuing an event of default under
the Indenture with respect to the Series A Subordinated Debentures. Any global
security that is exchangeable pursuant to the preceding sentence shall be
exchangeable for definitive certificates registered in such names as DTC shall
direct. It is expected that such instructions will be based upon directions
received by DTC from its Participants with respect to ownership of beneficial
interests in such global security. In the event that Series A Preferred
Securities are issued in definitive form, such Series A Preferred Securities
will be in denominations of $25 and integral multiples thereof and may be
transferred or exchanged at the offices described below.
 
  Payments on Series A Preferred Securities represented by a global security
will be made to DTC, as the depositary for the Series A Preferred Securities.
In the event Series A Preferred Securities are issued in certificated form,
the Liquidation Amount and Distributions will be payable, the transfer of the
Series A Preferred Securities will be registrable, and Series A Preferred
Securities will be exchangeable for Series A Preferred Securities of other
denominations of a like aggregate Liquidation Amount, at the corporate office
of the Property Trustee in Chicago, Illinois, or at the offices of any paying
agent or transfer agent appointed by the Administrative Trustees, provided
that payment of any Distribution may be made at the option of the
Administrative Trustees by check mailed to the address of the persons entitled
thereto or by wire transfer. In addition, if the Series A Preferred Securities
are issued in certificated form, the record dates for payment of Distributions
will be the fifteenth day (whether or not a Business Day) of the month in
which the relevant Distribution payment is scheduled to be made. For a
description of DTC and the terms of the depositary arrangements relating to
payments, transfers, voting rights, redemptions and other notices and other
matters, see "Book-Entry Issuance" in the accompanying Prospectus.
 
               CERTAIN TERMS OF SERIES A SUBORDINATED DEBENTURES
 
GENERAL
 
  The following summary of certain terms and provisions of the Series A
Subordinated Debentures supplements the description of the terms and
provisions of the Corresponding Junior Subordinated Debentures set forth in
the accompanying Prospectus under the headings "Description of Junior
Subordinated Debentures," to which description reference is hereby made. The
summary of certain terms and provisions of the Series A Subordinated
Debentures set forth below, which describes the material provisions thereof,
does not purport to be
 
                                     S-18
<PAGE>
 
complete and is subject to, and is qualified in its entirety by reference to,
the Indenture to which reference is hereby made. The form of Indenture has
been filed as an exhibit to the Registration Statement of which this
Prospectus Supplement and accompanying Prospectus form a part.
 
  Concurrently with the issuance of the Series A Preferred Securities, the
Series A Issuer will invest the proceeds thereof, together with the
consideration paid by the Corporation for the Series A Common Securities, in
the Series A Subordinated Debentures issued by the Corporation. The Series A
Subordinated Debentures will bear interest at the annual rate of  % of the
principal amount thereof, payable quarterly in arrears on March 31, June 30,
September 30 and December 31 of each year (each, an "Interest Payment Date"),
commencing March 31, 1997, to the person in whose name each Series A
Subordinated Debenture is registered, subject to certain exceptions, at the
close of business on the Business Day next preceding such Interest Payment
Date. It is anticipated that, until the liquidation, if any, of the Series A
Issuer, the Series A Subordinated Debentures will be held in the name of the
Property Trustee in trust for the benefit of the holders of the Series A
Securities. The amount of interest payable for any period will be computed on
the basis of a 360-day year of twelve 30-day months. In the event that any
date on which interest is payable on the Series A Subordinated Debentures is
not a Business Day, then payment of the interest payable on such date will be
made on the next succeeding day that is a Business Day (and without any
interest or other payment in respect of any such delay), except that, if such
Business Day is in the next succeeding calendar year, such payment shall be
made on the immediately preceding Business Day, in each case with the same
force and effect as if made on the date such payment was originally payable.
Accrued interest that is not paid on the applicable Interest Payment Date will
bear additional interest on the amount thereof (to the extent permitted by
law) at the rate per annum of  % thereof, compounded quarterly from the
relevant Interest Payment Date. The term "interest" as used herein shall
include quarterly interest payments, interest on quarterly interest payments
not paid on the applicable Interest Payment Date and Additional Sums (as
defined below), as applicable.
   
  The Series A Subordinated Debentures will be issued as a series of junior
subordinated deferrable interest debentures under the Indenture. The Series A
Subordinated Debentures will mature on      , 2027 (such date, as it may be
shortened or extended as hereinafter described, the "Stated Maturity"). Such
date may be shortened at any time by the Corporation to any date not earlier
than      , 2002, subject to the Corporation's commitment to the Federal
Reserve not to do so without the prior approval of the Federal Reserve, if
then required under applicable Federal Reserve capital guidelines or policies.
Such date may also be extended at any time at the election of the Corporation
to a date or dates not later than      , 2046, provided that at the time such
election is made and at the time of extension (i) the Corporation is not in
bankruptcy, otherwise insolvent or in liquidation, (ii) the Corporation is not
in default in the payment of any interest or principal on the Series A
Subordinated Debentures, (iii) if the Series A Issuer has not been liquidated,
the Series A Issuer is not in arrears on payments of Distributions on the
Series A Preferred Securities and no deferred Distributions are accumulated,
(iv) the Series A Subordinated Debentures are rated not less than BBB- by
Standard & Poor's or Baa3 by Moody's or the equivalent by any other nationally
recognized statistical rating organization, and (v) after such extension the
Series A Subordinated Debentures shall not have a remaining term to maturity
of more than 30 years. In the event the Corporation elects to shorten or
extend the Stated Maturity of the Series A Subordinated Debentures, it shall
give notice to the Debenture Trustee, and the Debenture Trustee shall give
notice of such shortening or extension to the holders of the Series A
Subordinated Debentures not less than 30 nor more than 60 days prior to the
effectiveness thereof.     
   
  The Series A Subordinated Debentures are unsecured and subordinate and
junior in right of payment to all Senior Debt of the Corporation. See
"Description of Junior Subordinated Debentures--Subordination" in the
accompanying Prospectus. Substantially all of the Corporation's existing
indebtedness constitutes Senior Debt; as of September 30, 1996, the
Corporation had approximately $289 million aggregate principal amount of
Senior Debt outstanding. Because the Corporation is a holding company, the
right of the Corporation to participate in any distribution of assets of any
subsidiary, including the Bank, upon such subsidiary's liquidation or
reorganization or otherwise (and thus the ability of holders of the Series A
Preferred Securities to benefit indirectly from such distribution) is subject
to the prior claims of creditors of that subsidiary, except to the extent     
 
                                     S-19
<PAGE>
 
that the Corporation may itself be recognized as a creditor of that
subsidiary. Accordingly, the Series A Subordinated Debentures (and therefore
the Series A Preferred Securities) will be effectively subordinated to all
existing and future liabilities of the Corporation's subsidiaries, and holders
of Series A Subordinated Debentures should look only to the assets of the
Corporation for payments on the Series A Subordinated Debentures. The
Indenture does not limit the incurrence or issuance of other secured or
unsecured debt of the Corporation, including Senior Debt, whether under the
Indenture or any existing or other indenture that the Corporation may enter
into in the future or otherwise. See "Description of Junior Subordinated
Debentures--Subordination" in the accompanying Prospectus.
 
OPTION TO DEFER INTEREST PAYMENTS
 
  So long as no event of default under the Indenture has occurred and is
continuing, the Corporation has the right under the Indenture at any time or
from time to time during the term of the Series A Subordinated Debentures to
defer payment of interest on the Series A Subordinated Debentures for a period
not exceeding 20 consecutive quarters with respect to each Extension Period,
provided that no Extension Period may extend beyond the Stated Maturity of the
Series A Subordinated Debentures. At the end of such Extension Period, the
Corporation must pay all interest then accrued and unpaid on the Subordinated
Debentures (together with interest on such unpaid interest at the annual rate
of  %, compounded quarterly from the relevant Interest Payment Date, to the
extent permitted by applicable law). During an Extension Period, interest will
continue to accrue and holders of Series A Subordinated Debentures (or holders
of Series A Preferred Securities while such series is outstanding) will be
required to accrue interest income for United States federal income tax
purposes. See "Certain Federal Income Tax Consequences--Interest Income and
Original Issue Discount."
   
  During any such Extension Period, the Corporation may not (i) declare or pay
any dividends or distributions on, or redeem, purchase or acquire, or make a
liquidation payment with respect to, any of the Corporation's capital stock or
(ii) make any payment of principal of or interest or premium, if any, on or
repay, repurchase or redeem any debt securities of the Corporation (including
other Junior Subordinated Debentures) that rank pari passu in all respects
with or junior in interest to the Series A Subordinated Debentures (other than
(a) repurchases, redemptions or other acquisitions of shares of capital stock
of the Corporation in connection with any employment contract, benefit plan or
other similar arrangement with or for the benefit of one or more employees,
officers, directors or consultants, in connection with a dividend reinvestment
or stockholder stock purchase plan or in connection with the issuance of
capital stock of the Corporation (or securities convertible into or
exercisable for such capital stock) as consideration in an acquisition
transaction entered into prior to the applicable Extension Period, (b) as a
result of any exchange or conversion of any class or series of the
Corporation's capital stock (or any capital stock of a subsidiary of the
Corporation) for any class or series of the Corporation's capital stock or of
any class or series of the Corporation's indebtedness for any class or series
of the Corporation's capital stock, (c) the purchase of fractional interests
in shares of the Corporation's capital stock pursuant to the conversion or
exchange provisions of such capital stock or the security being converted or
exchanged, (d) any declaration of a dividend in connection with any
stockholder rights plan, or the issuance of rights, stock or other property
under any stockholder rights plan, or the redemption or repurchase of rights
pursuant thereto, or (e) any dividend in the form of stock, warrants, options
or other rights where the dividend stock or the stock issuable upon exercise
of such warrants, options or other rights is the same stock as that on which
the dividend is being paid or ranks pari passu with or junior to such stock).
Prior to the termination of any such Extension Period, the Corporation may
further defer the payment of interest on the Series A Subordinated Debentures,
provided that no Extension Period may exceed 20 consecutive quarters or extend
beyond the Stated Maturity of the Series A Subordinated Debentures. Upon the
termination of any such Extension Period and the payment of all interest then
accrued and unpaid (together with interest thereon at the rate of   % per
annum compounded quarterly, to the extent permitted by applicable law), the
Corporation may elect to begin a new Extension Period subject to the above
requirements. No interest shall be due and payable during an Extension Period,
except at the end thereof. The Corporation must give the Property Trustee, the
Administrative Trustees and the Debenture Trustee notice of its election to
begin such Extension Period at least one Business Day prior to the earliest of
(i) the date interest on the Series A Subordinated Debentures would have been
payable except for the election to begin such Extension Period, (ii) the date
on which the     
 
                                     S-20
<PAGE>
 
   
Administrative Trustees are required to give notice to the Nasdaq Stock Market
or other applicable stock exchange or automated quotation system on which the
Series A Preferred Securities are then listed or quoted or to holders of
Series A Preferred Securities of the record date and (iii) the date such
interest is payable, but in any event not less than one Business Day prior to
such record date. The Debenture Trustee shall give notice of the Corporation's
election to begin a new Extension Period to the holders of the Series A
Subordinated Debentures. There is no limitation on the number of times that
the Corporation may elect to begin an Extension Period. See "Description of
Junior Subordinated Debentures--Option to Defer Interest Payments" in the
accompanying Prospectus.     
 
ADDITIONAL SUMS
 
  If the Series A Issuer is required to pay any additional taxes, duties or
other governmental charges as a result of a Tax Event, the Corporation will
pay as additional amounts on the Series A Subordinated Debentures such amounts
as shall be required so that the Distributions payable by the Series A Issuer
shall not be reduced as a result of any such additional taxes, duties or other
governmental charges.
 
REDEMPTION
 
  The Series A Subordinated Debentures are redeemable prior to maturity at the
option of the Corporation (i) on or after      , 2002, in whole at any time or
in part from time to time, or (ii) at any time in whole (but not in part)
prior to            , 2002 and within 90 days following the occurrence and
continuation of a Tax Event or Capital Treatment Event, in either case at a
redemption price equal to the accrued and unpaid interest on the Series A
Subordinated Debentures so redeemed to the date fixed for redemption, plus
100% of the principal amount thereof. See "Description of Junior Subordinated
Debentures--Redemption" in the accompanying Prospectus.
 
DISTRIBUTION OF SERIES A SUBORDINATED DEBENTURES
 
  As described under "Certain Terms of Series A Preferred Securities--
Liquidation of Series A Issuer and Distribution of Series A Subordinated
Debentures to Holders," under certain circumstances involving the termination
of the Series A Issuer, Series A Subordinated Debentures may be distributed to
the holders of the Series A Preferred Securities in exchange therefor upon
liquidation of the Series A Issuer after satisfaction of liabilities to
creditors of the Series A Issuer as provided by applicable law. If distributed
to holders of Series A Preferred Securities, the Series A Subordinated
Debentures will initially be issued in the form of one or more global
securities and DTC, or any successor depositary for the Series A Preferred
Securities, will act as depositary for the Series A Subordinated Debentures.
It is anticipated that the depositary arrangements for the Series A
Subordinated Debentures would be substantially identical to those in effect
for the Series A Preferred Securities. If Series A Subordinated Debentures are
distributed to the holders of Series A Preferred Securities in exchange
therefor upon liquidation of the Series A Issuer, the Corporation will use its
best efforts to list the Series A Subordinated Debentures on the Nasdaq Stock
Market or such other stock exchanges or automated quotation systems, if any,
on which the Series A Preferred Securities are then listed or quoted. There
can be no assurance as to the market price of any Series A Subordinated
Debentures that may be distributed to the holders of Series A Preferred
Securities.
 
REGISTRATION OF SERIES A SUBORDINATED DEBENTURES
 
  The Series A Subordinated Debentures will be represented by global
certificates registered in the name of DTC or its nominee. Beneficial
interests in the Series A Subordinated Debentures will be shown on, and
transfers thereof will be effected only through, records maintained by
Participants in DTC. Except as described below and in the accompanying
Prospectus, Series A Subordinated Debentures in certificated form will not be
issued in exchange for the global certificates. See "Book-Entry Issuance" in
the accompanying Prospectus.
 
  A global security will be exchangeable for Series A Subordinated Debentures
registered in the names of persons other than DTC or its nominee only if (i)
DTC notifies the Corporation that it is unwilling or unable to continue as a
depositary for such global security and no successor depositary shall have
been appointed, or if at
 
                                     S-21
<PAGE>
 
any time DTC ceases to be a clearing agency registered under the Exchange Act,
at a time when DTC is required to be so registered to act as such depositary,
(ii) the Corporation in its sole discretion determines that such global
security shall be so exchangeable, or (iii) there shall have occurred and be
continuing an event of default under the Indenture with respect to the Series
A Subordinated Debentures. Any global security that is exchangeable pursuant
to the preceding sentence shall be exchangeable for definitive certificates
registered in such names as DTC shall direct. It is expected that such
instructions will be based upon directions received by DTC from its
Participants with respect to ownership of beneficial interests in such global
security. In the event that Series A Subordinated Debentures are issued in
definitive form, such Series A Subordinated Debentures will be in
denominations of $25 and integral multiples thereof and may be transferred or
exchanged at the offices described below.
 
  Payments on Series A Subordinated Debentures represented by a global
security will be made to DTC, as the depositary for the Series A Subordinated
Debentures. In the event Series A Subordinated Debentures are issued in
certificated form, principal and interest will be payable, the transfer of the
Series A Subordinated Debentures will be registrable, and Series A
Subordinated Debentures will be exchangeable for Series A Subordinated
Debentures of other denominations of a like aggregate principal amount, at the
corporate office of the Debenture Trustee in Chicago, Illinois, or at the
offices of any paying agent or transfer agent appointed by the Corporation,
provided that payment of interest may be made at the option of the Corporation
by check mailed to the address of the persons entitled thereto or by wire
transfer. In addition, if the Series A Subordinated Debentures are issued in
certificated form, the record dates for payment of interest will be the
fifteenth day (whether or not a Business Day) of the last month of each
calendar quarter. For a description of DTC and the terms of the depositary
arrangements relating to payments, transfers, voting rights, redemptions and
other notices and other matters, see "Book-Entry Issuance" in the accompanying
Prospectus.
 
                      CERTAIN TERMS OF SERIES A GUARANTEE
 
  The Series A Guarantee guarantees to the holders of the Series A Preferred
Securities the following payments, to the extent not paid by the Series A
Issuer: (i) any accumulated and unpaid Distributions required to be paid on
the Series A Preferred Securities, to the extent that the Series A Issuer has
funds on hand available therefor at such time, (ii) the Redemption Price with
respect to any Series A Preferred Securities called for redemption, to the
extent that the Series A Issuer has funds on hand available therefor at such
time, and (iii) upon a voluntary or involuntary dissolution, winding-up or
liquidation of the Series A Issuer (unless the Series A Subordinated
Debentures are distributed to holders of the Series A Preferred Securities),
the lesser of (a) the aggregate of the Liquidation Amount and all accumulated
and unpaid Distributions to the date of payment, to the extent that the Series
A Issuer has funds on hand available therefor at such time, and (b) the amount
of assets of the Series A Issuer remaining available for distribution to
holders of the Series A Preferred Securities after payment of creditors of the
Series A Issuer as required by applicable law. The Series A Guarantee will be
qualified as an indenture under the Trust Indenture Act. The First National
Bank of Chicago will act as the Guarantee Trustee for the purposes of
compliance with the Trust Indenture Act and will hold the Series A Guarantee
for the benefit of the holders of the Series A Preferred Securities. The First
National Bank of Chicago will also act as Debenture Trustee for the Series A
Subordinated Debentures and as Property Trustee.
 
  The holders of not less than a majority in aggregate Liquidation Amount of
the Series A Preferred Securities have the right to direct the time, method
and place of conducting any proceeding for any remedy available to the
Guarantee Trustee in respect to the Series A Guarantee or to direct the
exercise of any trust power conferred upon the Guarantee Trustee under the
Series A Guarantee. Any holder of the Series A Preferred Securities may
institute a legal proceeding directly against the Corporation to enforce its
rights under the Series A Guarantee without first instituting a legal
proceeding against the Series A Issuer, the Guarantee Trustee or any other
person or entity. If the Corporation were to default on its obligation to pay
amounts payable under the Series A Subordinated Debentures, the Series A
Issuer would lack funds for the payment of Distributions or amounts payable on
redemption of the Series A Preferred Securities or otherwise, and, in such
event, holders of the Series
 
                                     S-22
<PAGE>
 
A Preferred Securities would not be able to rely upon the Series A Guarantee
for payment of such amounts. Instead, if any event of default under the
Indenture shall have occurred and be continuing and such event is attributable
to the failure of the Corporation to pay interest on or principal of the
Series A Subordinated Debentures on the applicable payment date, then a holder
of Series A Preferred Securities may institute a Direct Action against the
Corporation pursuant to the terms of the Indenture for enforcement of payment
to such holder of the principal of or interest on such Series A Subordinated
Debentures having a principal amount equal to the aggregate Liquidation Amount
of the Series A Preferred Securities of such holder. In connection with such
Direct Action, the Corporation will have a right to set-off under the
Indenture to the extent of any payment made by the Corporation to such holder
of Series A Securities in the Direct Action. Except as described herein,
holders of Series A Preferred Securities will not be able to exercise directly
any other remedy available to the holders of the Series A Subordinated
Debentures or assert directly any other rights in respect of the Series A
Subordinated Debentures. See "Description of Guarantees" in the accompanying
Prospectus. The Trust Agreement provides that each holder of Series A
Preferred Securities by acceptance thereof agrees to the provisions of the
Series A Guarantee, the Expense Agreement and the Indenture.
 
                    CERTAIN FEDERAL INCOME TAX CONSEQUENCES
 
  The following is a summary of the principal United States federal income tax
consequences of the purchase, ownership and disposition of Series A Preferred
Securities. This summary only addresses the tax consequences to a person that
acquires Series A Preferred Securities on their original issue at their
original offering price and that is (i) an individual citizen or resident of
the United States, (ii) a corporation or partnership organized in or under the
laws of the United States or any state thereof or the District of Columbia or
(iii) an estate or trust the income of which is subject to United States
federal income tax regardless of source (a "United States Person"). This
summary does not address all tax consequences that may be applicable to a
United States Person that is a beneficial owner of Series A Preferred
Securities, nor does it address the tax consequences to (i) persons that are
not United States Persons, (ii) persons that may be subject to special
treatment under United States federal income tax law, such as banks, insurance
companies, thrift institutions, regulated investment companies, real estate
investment trusts, tax-exempt organizations and dealers in securities or
currencies, (iii) persons that will hold Series A Preferred Securities as part
of a position in a "straddle" or as part of a "hedging," "conversion" or other
integrated investment transaction for federal income tax purposes, (iv)
persons whose functional currency is not the United States dollar or (v)
persons that do not hold Series A Preferred Securities as capital assets.
 
  The statements of law or legal conclusion set forth in this summary
constitute the opinion of Schiff Hardin & Waite, counsel to the Corporation
and the Series A Issuer. This summary is based upon the Internal Revenue Code
of 1986, as amended (the "Code"), Treasury regulations, Internal Revenue
Service ("IRS") rulings and pronouncements and judicial decisions now in
effect, all of which are subject to change at any time. Such changes may be
applied retroactively in a manner that could cause the tax consequences to
vary substantially from the consequences described below, possibly adversely
affecting a beneficial owner of Series A Preferred Securities. In particular,
legislation has been proposed that could adversely affect the Corporation's
ability to deduct interest on the Series A Subordinated Debentures, which may
in turn permit the Corporation to cause a redemption of the Series A Preferred
Securities. See "--Possible Tax Law Changes." The authorities on which this
summary is based are subject to various interpretations, and it is therefore
possible that the federal income tax treatment of the purchase, ownership and
disposition of Series A Preferred Securities may differ from the treatment
described below.
 
  PROSPECTIVE INVESTORS ARE ADVISED TO CONSULT WITH THEIR OWN TAX ADVISORS IN
LIGHT OF THEIR OWN PARTICULAR CIRCUMSTANCES AS TO THE FEDERAL TAX CONSEQUENCES
OF THE PURCHASE, OWNERSHIP AND DISPOSITION OF SERIES A PREFERRED SECURITIES,
AS WELL AS THE EFFECT OF ANY STATE, LOCAL OR FOREIGN TAX LAWS.
 
                                     S-23
<PAGE>
 
CLASSIFICATION OF THE SERIES A ISSUER
 
  Under current law and assuming compliance with the terms of the Trust
Agreement, the Series A Issuer will not be classified as an association
taxable as a corporation for United States federal income tax purposes. As a
result, each beneficial owner of Series A Preferred Securities (a
"Securityholder") will be required to include in its gross income its pro rata
share of the interest income, including original issue discount, paid or
accrued with respect to the Series A Subordinated Debentures whether or not
cash is actually distributed to the Securityholders. See "--Interest Income
and Original Issue Discount." No amount included in income with respect to the
Series A Preferred Securities will be eligible for the dividends-received
deduction.
 
INTEREST INCOME AND ORIGINAL ISSUE DISCOUNT
 
  Under recently issued Treasury regulations applicable to debt instruments
issued on or after August 13, 1996 (the "Regulations"), a contingency that
stated interest will not be timely paid that is "remote" because of the terms
of the relevant debt instrument will be ignored in determining whether such
debt instrument is issued with original issue discount ("OID"). As a result of
terms and conditions of the Series A Subordinated Debentures that prohibit
certain payments with respect to the Corporation's capital stock and
indebtedness if the Corporation elects to extend interest payment periods, the
Corporation believes that the likelihood of its exercising its option to defer
payments is remote. Based on the foregoing, the Corporation believes that the
Series A Subordinated Debentures will not be considered to be issued with OID
at the time of their original issuance and, accordingly, a Securityholder
should include in gross income such holder's allocable share of interest on
the Series A Subordinated Debentures.
 
  Under the Regulations, if the Corporation exercises its option to defer any
payment of interest, the Series A Subordinated Debentures would at that time
be treated as issued with OID, and all stated interest on the Series A
Subordinated Debentures would thereafter be treated as OID as long as the
Series A Subordinated Debentures remained outstanding. In such event, all of a
Securityholder's taxable interest income with respect to the Series A
Subordinated Debentures would be accounted for as OID on an economic-accrual
basis regardless of such holder's method of tax accounting, and actual
distributions of stated interest would not be reported as taxable income.
Consequently, a Securityholder would be required to include in gross income
OID even though the Corporation would not make any actual cash payments during
an Extension Period.
 
  The Regulations have not been addressed in any rulings or other
interpretations by the IRS, and it is possible that the IRS could take a
position contrary to the interpretation herein.
 
  Because income on the Series A Preferred Securities will constitute interest
or OID, corporate Securityholders will not be entitled to a dividends-received
deduction with respect to any income recognized with respect to the Series A
Preferred Securities.
 
DISTRIBUTION OF SERIES A SUBORDINATED DEBENTURES TO HOLDERS OF SERIES A
PREFERRED SECURITIES
 
  Under current law, a distribution by the Series A Issuer of the Series A
Subordinated Debentures as described under the caption "Certain Terms of
Series A Preferred Securities--Liquidation of Series A Issuer and Distribution
of Series A Subordinated Debentures to Holders" will be non-taxable and will
result in the Securityholder receiving directly its pro rata share of the
Series A Subordinated Debentures previously held indirectly through the Series
A Issuer, with a holding period and aggregate-tax basis equal to the holding
period and aggregate-tax basis such Securityholder had in its Series A
Preferred Securities before such distribution. If, however, the liquidation of
the Series A Issuer were to occur because the Series A Issuer is subject to
United States federal income tax with respect to income accrued or received on
the Series A Subordinated Debentures, the distribution of Series A
Subordinated Debentures to Securityholders by the Series A Issuer would be a
taxable event to the Series A Issuer and each Securityholder, and each
Securityholder would recognize gain or loss as if the Securityholder had
exchanged its Series A Preferred Securities for the Series A Subordinated
Debentures it received upon the liquidation of the Series A Issuer. A
Securityholder will include interest in income in respect of Series A
Subordinated Debentures received from the Series A Issuer in the manner
described above under "--Interest Income and Original Issue Discount."
 
                                     S-24
<PAGE>
 
SALE OR REDEMPTION OF SERIES A PREFERRED SECURITIES
 
  A Securityholder that sells (including a redemption for cash) Series A
Preferred Securities will recognize gain or loss equal to the difference
between its adjusted-tax basis in the Series A Preferred Securities and the
amount realized on the sale of such Series A Preferred Securities. Assuming
that the Corporation does not exercise its option to defer payment of interest
on the Series A Subordinated Debentures and the Series A Subordinated
Debentures are not considered issued with OID, a Securityholder's adjusted tax
basis in the Series A Preferred Securities generally will be its initial
purchase price. If the Series A Subordinated Debentures are deemed to be
issued with OID, as a result of the Corporation's deferral of interest
payments, a Securityholder's adjusted tax basis in the Series A Preferred
Securities generally will be its initial purchase price, increased by OID
previously includible in such Securityholder's gross income to the date of
disposition and decreased by Distributions or other payments received on the
Series A Preferred Securities since and including the date of the first
Extension Period. Such gain or loss generally will be a capital gain or loss
(except to the extent any amount realized is treated as a payment of accrued
interest with respect to such Securityholder's pro rata share of the Series A
Subordinated Debentures required to be included in income) and generally will
be a long-term capital gain or loss if the Series A Preferred Securities have
been held for more than one year.
 
  Should the Corporation exercise its option to defer any payment of interest
on the Series A Subordinated Debentures, the Series A Preferred Securities may
trade at a price that does not accurately reflect the value of accrued but
unpaid interest with respect to the underlying Series A Subordinated
Debentures. In the event of such a deferral, a Securityholder who disposes of
its Series A Preferred Securities between record dates for payments of
distributions thereon will be required to include in income as ordinary income
accrued but unpaid interest on the Series A Subordinated Debentures to the
date of disposition and to add such amount to its adjusted-tax basis in its
Series A Preferred Securities. To the extent the selling price is less than
the Securityholder's adjusted-tax basis, such holder will recognize a capital
loss. Subject to certain limited exceptions, capital losses cannot be applied
to offset ordinary income for United States federal income tax purposes.
 
MARKET DISCOUNT AND ACQUISITION PREMIUM
 
  Holders of Series A Preferred Securities other than initial holders may be
considered to have acquired their undivided interests in the Series A
Subordinated Debentures with "market discount" or "acquisition premium," as
such terms are defined for United States federal income tax purposes. Such
holders are advised to consult their tax advisors as to the income tax
consequences of the acquisition, ownership and disposition of the Series A
Preferred Securities.
 
BACKUP WITHHOLDING TAX AND INFORMATION REPORTING
 
  The amount of interest income paid and OID accrued on the Series A Preferred
Securities held of record by United States Persons (other than corporations
and other exempt Securityholders) will be reported to the IRS. "Backup"
withholding at a rate of 31% will apply to payments of interest to nonexempt
United States Persons unless the Securityholder furnishes its taxpayer
identification number in the manner prescribed in applicable Treasury
Regulations, certifies that such number is correct, certifies as to no loss of
exemption from backup withholding and meets certain other conditions.
 
  Payment of the proceeds from the disposition of Series A Preferred
Securities to or through the United States office of a broker is subject to
information reporting and backup withholding unless the holder or beneficial
owner establishes an exemption from information reporting and backup
withholding.
 
  Any amounts withheld from a Securityholder under the backup withholding
rules will be allowed as a refund or a credit against such Securityholder's
United States federal income tax liability, provided the required information
is furnished to the IRS.
 
  It is anticipated that income on the Series A Preferred Securities will be
reported to holders on Form 1099 and mailed to holders of the Series A
Preferred Securities by January 31 following each calendar year.
 
 
                                     S-25
<PAGE>
 
POSSIBLE TAX LAW CHANGES
 
  On March 19, 1996, the Revenue Reconciliation Bill, the revenue portion of
President Clinton's budget proposal, was introduced in the 104th Congress. If
enacted, the Revenue Reconciliation Bill would have generally denied interest
deductions for interest on an instrument issued by a corporation that has a
maximum term of more than 20 years and that is not shown as indebtedness on the
separate balance sheet of the issuer or, where the instrument is issued to a
related party (other than a corporation), where the holder or some other
related party issues a related instrument that is not shown as indebtedness on
the issuer's consolidated balance sheet. For purposes of determining the
weighted average maturity or the term of an instrument, any right to extend
would be treated as exercised. The above-described provisions of the Revenue
Reconciliation Bill were proposed to be effective generally for instruments
issued on or after December 7, 1995. If the proposed provision had applied to
the Series A Subordinated Debentures, the Corporation would have been unable to
deduct interest on the Series A Subordinated Debentures. However, on March 29,
1996, the Chairmen of the Senate Finance and House Ways and Means Committees
issued a joint statement to the effect that it was their intention that the
effective date of the President's legislative proposals, if adopted, will be no
earlier than the date of appropriate Congressional action. The 104th Congress
adjourned without enacting the above-described provisions of the Revenue
Reconciliation Bill, and under current law, the Corporation will be able to
deduct interest on the Series A Subordinated Debentures.
 
  Although the above-described provisions of the Revenue Reconciliation Bill
were not enacted in 1996, there can be no assurance that current or future
legislative proposals or final legislation will not affect the ability of the
Corporation to deduct interest on the Series A Subordinated Debentures. Such a
change could give rise to a Tax Event, which may permit the Corporation to
cause a redemption of the Series A Preferred Securities before           ,
2002, as described more fully under "Description of Preferred Securities--
Redemption or Exchange--Mandatory Redemption--Tax Event or Capital Treatment
Event Redemption" in the accompanying Prospectus.
 
                                      S-26
<PAGE>
 
                                 UNDERWRITING
 
  Subject to the terms and conditions set forth in the Underwriting Agreement,
the Corporation and the Series A Issuer have agreed that the Series A Issuer
will sell to              (the "Underwriters"), and the Underwriters have
agreed to purchase from the Series A Issuer, the respective number of Series A
Preferred Securities set forth opposite their names below. In the Underwriting
Agreement, the several Underwriters have agreed, subject to the terms and
conditions set forth therein, to purchase all the Series A Preferred
Securities offered hereby if any of the Series A Preferred Securities are
purchased. In the event of default by an Underwriter, the Underwriting
Agreement provides that, in certain circumstances, the purchase commitments of
the nondefaulting Underwriters may be increased or the Underwriting Agreement
may be terminated.
 
<TABLE>
<CAPTION>
                                                                      NUMBER OF
                                                                       SERIES A
                                                                      PREFERRED
                              UNDERWRITER                             SECURITIES
                              -----------                             ----------
   <S>                                                                <C>
 
                                                                         ----
     Total...........................................................
                                                                         ====
</TABLE>
 
  The Underwriters propose initially to offer the Series A Preferred
Securities to the public at the public offering price set forth on the cover
page of this Prospectus Supplement and to certain dealers at such price less a
concession not in excess of $  per Series A Preferred Security. The
Underwriters may allow, and such dealers may reallow, a discount not in excess
of $.  per Series A Preferred Security to certain other dealers. After the
initial public offering, the public offering price, concession and discount
may be changed.
 
  In view of the fact that the proceeds from the sale of the Series A
Preferred Securities will be used to purchase the Series A Subordinated
Debentures issued by the Corporation, the Underwriting Agreement provides that
the Corporation will pay as Underwriters' compensation for the Underwriters'
arranging the investment therein of such proceeds an amount of $    per Series
A Preferred Security for the accounts of the several Underwriters.
 
  The Corporation and the Series A Issuer have agreed that, during the period
beginning from the date of the Underwriting Agreement and continuing to and
including the earlier of (i) the termination of trading restrictions on the
Series A Preferred Securities, as determined by the Underwriters, and (ii)
days after the closing date, they will not offer, sell, contract to sell or
otherwise dispose of any Preferred Securities, any other beneficial interests
in the assets of the Series A Issuer, or any preferred securities or any other
securities of the Series A Issuer or the Corporation which are substantially
similar to the Series A Preferred Securities, including any guarantee of such
securities, or any securities convertible into or exchangeable for or
representing the right to receive securities, preferred securities or any such
substantially similar securities of either the Series A Issuer or the
Corporation, without the prior written consent of the Underwriters, except for
the Series A Preferred Securities offered in connection with this offering.
   
  Prior to this offering, there has been no public market for the Series A
Preferred Securities. Application has been made to list the Series A Preferred
Securities on the Nasdaq Stock Market. Trading of the Series A Preferred
Securities on the Nasdaq Stock Market is expected to commence
contemporaneously with the initial delivery of the Series A Preferred
Securities. The Underwriters have advised the Corporation that they intend to
make a market in the Series A Preferred Securities prior to commencement of
trading on the Nasdaq Stock     
 
                                     S-27
<PAGE>
 
Market, but are not obligated to do so and may discontinue market making at
any time without notice. No assurance can be given as to the liquidity of the
trading market for the Series A Preferred Securities.
 
  The Corporation and the Series A Issuer have agreed to indemnify the several
Underwriters against, or contribute to payments that the Underwriters may be
required to make in respect of, certain liabilities, including liabilities
under the Securities Act of 1933, as amended.
 
  Certain of the Underwriters or their affiliates have provided from time to
time, and expect to provide in the future, investment or commercial banking
services to the Corporation and its affiliates, for which such Underwriters or
their affiliates have received or will receive customary fees and commissions.
 
                            VALIDITY OF SECURITIES
   
  Certain matters of Delaware law relating to the validity of the Series A
Preferred Securities, the enforceability of the Trust Agreement and the
creation of the Series A Issuer will be passed upon by Richards, Layton &
Finger, Wilmington, Delaware, special Delaware counsel to the Corporation and
the Series A Issuer. The validity of the Series A Guarantee and the Series A
Subordinated Debentures will be passed upon for the Corporation by Schiff
Hardin & Waite, Chicago, Illinois, and for the Underwriters by Sullivan &
Cromwell, New York, New York. Schiff Hardin & Waite will rely as to all
matters of Delaware law upon the opinion of Richards, Layton & Finger, and
Sullivan and Cromwell will rely as to all matters of Illinois law upon the
opinion of Schiff Hardin & Waite. Certain matters relating to United States
federal income tax considerations will be passed upon for the Corporation by
Schiff Hardin & Waite.     
 
                                     S-28
<PAGE>
 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A         +
+REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE   +
+SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY  +
+OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT        +
+BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR   +
+THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE      +
+SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE    +
+UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF  +
+ANY SUCH STATE.                                                               +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                  
               SUBJECT TO COMPLETION, DATED JANUARY 3, 1997     
                           NORTHERN TRUST CORPORATION
               JUNIOR SUBORDINATED DEFERRABLE INTEREST DEBENTURES
 
                                 NTC CAPITAL I
                                 NTC CAPITAL II
                                NTC CAPITAL III
 
PREFERRED SECURITIES FULLY AND UNCONDITIONALLY GUARANTEED, AS DESCRIBED HEREIN,
                                       BY
 
                           NORTHERN TRUST CORPORATION
 
  Northern Trust Corporation, a Delaware corporation (the "Corporation"), may
from time to time offer in one or more series or issuances its junior
subordinated deferrable interest debentures (the "Junior Subordinated
Debentures"). The Junior Subordinated Debentures will be unsecured and
subordinate and junior in right of payment to all Senior Debt (as defined in
"Description of Junior Subordinated Debentures--Subordination") of the
Corporation. If provided in an accompanying Prospectus Supplement, the
Corporation will have the right to defer payments of interest on any series of
Junior Subordinated Debentures by extending the interest payment period thereon
at any time or from time to time for up to such number of consecutive interest
payment periods (which shall not extend beyond the Stated Maturity (as defined
herein) of the Junior Subordinated Debentures) with respect to each deferral
period as may be specified in such Prospectus Supplement (each, an "Extension
Period"). In such circumstances, however, the Corporation would not be
permitted, subject to certain exceptions set forth herein, to declare or pay
any dividends, distributions or other payments with respect to, or repay,
repurchase, redeem or otherwise acquire, the Corporation's capital stock or
debt securities that rank pari passu in all respects with or junior to such
series of Junior Subordinated Debentures. See "Description of Junior
Subordinated Debentures--Option to Defer Interest Payments" and "--Restrictions
on Certain Payments."
 
  NTC Capital I, NTC Capital II and NTC Capital III, each a statutory business
trust created under the laws of the State of Delaware (each, an "Issuer," and
collectively, the "Issuers"), may severally offer, from time to time, preferred
securities (the "Preferred Securities") representing preferred beneficial
interests in such Issuer. The Corporation will be the owner of the common
securities representing common ownership interests in such Issuer (the "Common
Securities" and, together with the Preferred Securities, the "Trust
Securities"). Holders of the Preferred Securities will be entitled to receive
preferential cumulative cash distributions ("Distributions") accumulating from
the date of original issuance and payable periodically as provided in an
accompanying
 
                                                        (continued on next page)
 
                                  -----------
 
  THESE SECURITIES  ARE NOT DEPOSITS OR  OTHER OBLIGATIONS OF A  BANK AND ARE
     NOT INSURED
     BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY OTHER GOVERNMENTAL
                                    AGENCY.
 
THESE SECURITIES  HAVE NOT BEEN APPROVED  OR DISAPPROVED BY THE  SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
 AND EXCHANGE  COMMISSION OR ANY  STATE SECURITIES COMMISSION PASSED  UPON THE
  ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE
                        CONTRARY IS A CRIMINAL OFFENSE.
 
                                  -----------
 
                The date of this Prospectus is January   , 1997.
<PAGE>
 
(cover page continued)
   
Prospectus Supplement. Concurrently with the issuance by an Issuer of its
Preferred Securities, such Issuer will invest the proceeds thereof and any
contributions received in respect of the Common Securities in a corresponding
series of the Corporation's Junior Subordinated Debentures (the "Corresponding
Junior Subordinated Debentures") with terms corresponding to the terms of that
Issuer's Preferred Securities (the "Related Preferred Securities"). The
Corresponding Junior Subordinated Debentures will be the sole assets of each
Issuer, and payments under the Corresponding Junior Subordinated Debentures
will be the only revenue of each Issuer. If provided in an accompanying
Prospectus Supplement, the Corporation may, upon receipt of the prior approval
of the Board of Governors of the Federal Reserve System (the "Federal
Reserve"), if then required under applicable Federal Reserve capital
guidelines or policies, redeem the Corresponding Junior Subordinated
Debentures (and cause the redemption of the related Trust Securities) or may
terminate each Issuer and, after satisfaction of the liabilities to creditors
of the Series A Issuer as required by applicable law, cause the Corresponding
Junior Subordinated Debentures to be distributed to the holders of the Related
Preferred Securities in liquidation of their interests in such Issuer. See
"Description of Preferred Securities--Liquidation Distribution Upon
Termination."     
 
  If provided in an accompanying Prospectus Supplement, the Corporation will
have the right to defer payments of interest on any series of Corresponding
Junior Subordinated Debentures. If interest payments are so deferred,
Distributions on the Related Preferred Securities will also be deferred and
the Corporation will not be permitted, subject to certain exceptions set forth
herein, to declare or pay any cash distributions with respect to the
Corporation's capital stock or debt securities that rank pari passu with or
junior to the Corresponding Junior Subordinated Debentures. During an
Extension Period, Distributions will continue to accumulate (and the Preferred
Securities will accumulate additional Distributions thereon at the rate per
annum set forth in the related Prospectus Supplement). See "Description of
Preferred Securities--Distributions."
 
  Taken together, the Corporation's obligations under each series of Junior
Subordinated Debentures, the Indenture, the related Trust Agreement, the
related Expense Agreement and the related Guarantee (each, as defined herein),
in the aggregate, provide a full, irrevocable and unconditional guarantee of
payments of distributions and other amounts due on the related series of
Preferred Securities. See "Relationship Among the Preferred Securities, the
Corresponding Junior Subordinated Debentures, the Expense Agreement and the
Guarantees--Full and Unconditional Guarantee." The payment of Distributions
with respect to the Preferred Securities of each Issuer and payments on
liquidation or redemption with respect to such Preferred Securities, in each
case out of funds held by such Issuer, are each irrevocably guaranteed by the
Corporation to the extent described herein (each, a "Guarantee"). See
"Description of Guarantees." The obligations of the Corporation under each
Guarantee will be subordinate and junior in right of payment to all Senior
Debt.
 
  The Junior Subordinated Debentures and Preferred Securities may be offered
in amounts, at prices and on terms to be determined at the time of offering;
provided, however, the aggregate initial public offering price of all Junior
Subordinated Debentures (other than Corresponding Junior Subordinated
Debentures) and Preferred Securities (including the Corresponding Junior
Subordinated Debentures) issued pursuant to the Registration Statement of
which this Prospectus forms a part shall not exceed $250,000,000. Certain
specific terms of the Junior Subordinated Debentures or Preferred Securities
in respect of which this Prospectus is being delivered will be described in an
accompanying Prospectus Supplement, including without limitation and where
applicable and to the extent not set forth herein, (a) in the case of Junior
Subordinated Debentures, the specific designation, aggregate principal amount,
denominations, Stated Maturity (including any provisions for the shortening or
extension thereof), interest payment dates, interest rate (which may be fixed
or variable) or method of calculating interest, if any, applicable Extension
Period or interest deferral terms, if any, place or places where principal,
premium, if any, and interest, if any, will be payable, any terms of
redemption, any sinking fund provisions, terms for any conversion or exchange
into other securities, initial offering or purchase price, methods of
distribution and any other special terms, and (b) in the case of Preferred
Securities, the identity of the Issuer, specific title, aggregate amount,
stated liquidation amount, number of securities, Distribution rate or method
of calculating such rate, Distribution payment dates, applicable Distribution
deferral terms, if any, place or places where Distributions will be payable,
any terms of redemption, exchange, initial offering or purchase price, methods
of distribution and any other special terms.
 
                                       2
<PAGE>
 
(cover page continued)
 
  The Prospectus Supplement also will contain information, as applicable,
about certain United States federal income tax consequences relating to the
Junior Subordinated Debentures or Preferred Securities.
 
  The Junior Subordinated Debentures and Preferred Securities may be sold to
or through underwriters, through dealers, remarketing firms or agents or
directly to purchasers. See "Plan of Distribution." The names of any
underwriters, dealers, remarketing firms or agents involved in the sale of
Junior Subordinated Debentures or Preferred Securities in respect of which
this Prospectus is being delivered and any applicable fee, commission or
discount arrangements with them will be set forth in a Prospectus Supplement.
The Prospectus Supplement will state whether the Junior Subordinated
Debentures or Preferred Securities will be listed on any national securities
exchange or automated quotation system. If the Junior Subordinated Debentures
or Preferred Securities are not listed on any national securities exchange or
automated quotation system, there can be no assurance that there will be a
secondary market for the Junior Subordinated Debentures or Preferred
Securities.
 
  This Prospectus may not be used to consummate sales of Junior Subordinated
Debentures or Preferred Securities unless accompanied by a Prospectus
Supplement.
 
                                       3
<PAGE>
 
                             AVAILABLE INFORMATION
 
  The Corporation is subject to the informational requirements of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and in
accordance therewith, files reports, proxy statements and other information
with the Securities and Exchange Commission (the "Commission"). Such reports,
proxy statements and other information can be inspected and copied at the
public reference facilities of the Commission at Room 1024, 450 Fifth Street,
N.W., Washington, D.C. 20549 and at the regional offices of the Commission
located at 7 World Trade Center, Suite 1300, New York, New York 10048 and 500
West Madison Street, Suite 1400, Chicago, Illinois 60661. Copies of such
material can also be obtained at prescribed rates by writing to the Public
Reference Section of the Commission at 450 Fifth Street, N.W., Washington,
D.C. 20549. Such material may also be accessed electronically by means of the
Commission's home page on the Internet at http://www.sec.gov.
 
  The Corporation and the Issuers have filed with the Commission a
Registration Statement on Form S-3 (together with all amendments and exhibits
thereto, the "Registration Statement") under the Securities Act of 1933, as
amended (the "Securities Act"), with respect to the securities offered hereby.
This Prospectus does not contain all the information set forth in the
Registration Statement, certain portions of which have been omitted as
permitted by the rules and regulations of the Commission. For further
information with respect to the Corporation and the securities offered hereby,
reference is made to the Registration Statement and the exhibits and the
financial statements, notes and schedules filed as a part thereof or
incorporated by reference therein, which may be inspected at the public
reference facilities of the Commission at the addresses set forth above or
through the Commission's home page on the Internet. Statements made in this
Prospectus concerning the contents of any documents referred to herein are not
necessarily complete and in each instance are qualified in all respects by
reference to the copy of such document filed as an exhibit to the Registration
Statement.
 
  No separate financial statements of any Issuer have been included herein.
The Corporation and the Issuers do not consider that such financial statements
would be material to holders of the Preferred Securities because each Issuer
is a newly formed special purpose entity, has no operating history or
independent operations and is not engaged in and does not propose to engage in
any activity other than holding as trust assets the Corresponding Junior
Subordinated Debentures of the Corporation and issuing the Trust Securities.
Furthermore, taken together, the Corporation's obligations under each series
of Corresponding Junior Subordinated Debentures, the Indenture, the related
Trust Agreement, the related Expense Agreement and the related Guarantee
provide, in the aggregate, a full, irrevocable and unconditional guarantee of
payments of Distributions and other amounts due on the related Preferred
Securities of an Issuer. See "The Issuers," "Description of Preferred
Securities," "Description of Junior Subordinated Debentures--Corresponding
Junior Subordinated Debentures" and "Description of Guarantees." In addition,
the Corporation does not expect that any of the Issuers will be filing reports
under the Exchange Act with the Commission.
 
                                       4
<PAGE>
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
  The following documents filed by the Corporation with the Commission are
incorporated into this Prospectus by reference:
 
    1. the Corporation's Annual Report on Form 10-K for the year ended
  December 31, 1995;
 
    2. the Corporation's Quarterly Reports on Form 10-Q for the quarters
  ended March 31, 1996, June 30, 1996 and September 30, 1996; and
 
    3. the Corporation's Current Reports on Form 8-K dated January 5, 1996,
  January 16, 1996, April 17, 1996, July 16, 1996, October 15, 1996 and
  November 19, 1996.
 
  Each document or report filed by the Corporation pursuant to Section 13(a),
13(c), 14 or 15(d) of the Exchange Act after the date hereof and prior to the
termination of any offering of securities made by this Prospectus shall be
deemed to be incorporated by reference into this Prospectus and to be a part
of this Prospectus from the date of filing of such document. Any statement
contained herein, or in a document all or a portion of which is incorporated
or deemed to be incorporated by reference herein, shall be deemed to be
modified or superseded for purposes of the Registration Statement and this
Prospectus to the extent that a statement contained herein or in any other
subsequently filed document which also is or is deemed to be incorporated by
reference herein modifies or supersedes such statement. Any such statement so
modified or superseded shall not be deemed, except as so modified or
superseded, to constitute a part of the Registration Statement or this
Prospectus.
 
  The Corporation will provide without charge to any person to whom this
Prospectus is delivered, on the written or oral request of such person, a copy
of any or all of the foregoing documents incorporated by reference herein
(other than exhibits not specifically incorporated by reference into the texts
of such documents). Requests for such documents should be directed to Northern
Trust Corporation, Fifty South LaSalle Street, Chicago, Illinois 60675,
Attention: Secretary, telephone number (312) 630-6000.
 
                                       5
<PAGE>
 
                                THE CORPORATION
 
  The Corporation is a bank holding company within the meaning of the Bank
Holding Company Act of 1956, as amended (the "BHC Act"). The Corporation was
organized in Delaware in 1971 and that year became the owner of all of the
outstanding capital stock (except directors' qualifying shares) of The
Northern Trust Company (the "Bank"), the Corporation's principal banking
subsidiary. At September 30, 1996, the Corporation owned, in addition to the
Bank, one bank in each of Arizona, California, Florida and Texas, trust
companies in Connecticut and New York and various other non-bank subsidiaries,
including a securities brokerage firm, a retirement services company and a
futures commission merchant.
 
  The Corporation's principal executive offices are located at Fifty South
LaSalle Street, Chicago, Illinois 60675, and its telephone number is (312)
630-6000.
 
                       CERTAIN REGULATORY CONSIDERATIONS
 
  The Corporation's principal assets and sources of income are its investments
in its bank subsidiaries, and it is a legal entity separate and distinct from
its banks and other subsidiaries. There are various legal limitations on the
extent to which these banks and other subsidiaries can finance or otherwise
supply funds to the Corporation and certain of its affiliates.
 
DIVIDENDS AND LOANS OR ADVANCES
 
  Provisions of state and federal banking laws restrict the amount of
dividends that can be paid to the Corporation by its banking subsidiaries.
Under applicable state and federal laws, no dividends may be paid in an amount
greater than the net profits then on hand, reduced by certain loan losses (as
defined in the applicable statute). In addition, prior approval of federal
banking authorities is required if dividends declared by a subsidiary bank in
any calendar year will exceed its net profits (as defined) for that year,
combined with its retained net profits for the preceding two years.
 
  Based on these regulations, the Corporation's banking subsidiaries, without
regulatory approval, could declare dividends during 1996 equal to their 1996
eligible net profits (as defined) plus $181.1 million. The ability of each
banking subsidiary to pay dividends to the Corporation may be further
restricted as a result of regulatory policies and guidelines relating to
dividend payments and capital adequacy.
 
  State and federal laws limit the transfer of funds by a banking subsidiary
to the Corporation and certain of its affiliates in the form of loans or
extensions of credit, investments or purchases of assets. Transfers of this
kind to the Corporation or a nonbanking subsidiary by a banking subsidiary are
each limited to 10% of the banking subsidiary's capital and surplus with
respect to each affiliate and to 20% in the aggregate, and are also subject to
certain collateral requirements. These transactions, as well as other
transactions between a banking subsidiary and the Corporation or its
affiliates, must also be on terms substantially the same as, or at least as
favorable as, those prevailing at the time for comparable transactions with
non-affiliated companies or, in the absence of comparable transactions, on
terms, or under circumstances, including credit standards, that would be
offered to, or would apply to, non-affiliated companies.
 
  Consistent with its policy regarding bank holding companies serving as a
source of financial strength for their subsidiary banks, the Federal Reserve
has stated that, as a matter of prudent banking, a bank holding company
generally should not maintain a rate of cash dividends unless its net income
available to common stockholders has been sufficient to fully fund the
dividends, and the prospective rate of earnings retention appears consistent
with the bank holding company's capital needs, asset quality and overall
financial condition. In the first nine months of 1996, the Corporation's net
income available to common stockholders was $187.7 million and it declared
common stock dividends totaling $52.5 million.
 
CAPITAL ADEQUACY
 
  The Federal bank regulators have adopted risk-based capital guidelines for
bank holding companies and banks. The minimum ratio of qualifying total
capital to risk-weighted assets (including certain off-balance sheet items)
("Total Capital Ratio") is 8%. At least half of the Total Capital is to be
comprised of common stock, retained earnings, noncumulative perpetual
preferred stock, minority interests and, for bank holding companies,
 
                                       6
<PAGE>
 
a limited amount of qualifying cumulative perpetual preferred stock, less
certain intangibles including goodwill ("Tier 1" capital). The balance may
consist of other preferred stock, certain other instruments, and limited
amounts of subordinated debt and the loan and lease loss allowance.
 
  In addition, the Federal Reserve has established minimum Leverage Ratio
(Tier 1 capital to average total assets) guidelines for bank holding companies
and banks. The Federal Reserve's guidelines provide for a minimum Leverage
Ratio of 3% for bank holding companies and banks that meet certain specified
criteria, including having the highest regulatory rating. All other banking
organizations are required to maintain a Leverage Ratio of at least 3% plus an
additional cushion of 100 to 200 basis points. The guidelines also provide
that banking organizations experiencing internal growth or making acquisitions
will be expected to maintain strong capital positions substantially above the
minimum supervisory levels, without significant reliance on intangible assets.
Furthermore, the guidelines indicate that the Federal Reserve will continue to
consider a "Tangible Tier 1 Leverage Ratio" in evaluating proposals for
expansion or new activities. The Tangible Tier 1 Leverage Ratio is the ratio
of Tier 1 capital, less intangibles not deducted from Tier 1 capital, to
average total assets. As of September 30, 1996, the Federal Reserve had not
advised the Corporation of any specific minimum Leverage Ratio applicable to
it.
 
  Federal bank regulators continue to indicate their desire to raise capital
requirements applicable to banking organizations. The Federal Reserve has
recently added interest rate and market risk components to risk-based capital
requirements.
 
FDICIA
 
  In addition to the effects of the provisions described above, the Federal
Deposit Insurance Corporation Improvement Act of 1991 ("FDICIA") substantially
revised the depository institution regulatory and funding provisions of the
Federal Deposit Insurance Act ("FDIA") and made revisions to several other
federal banking statutes.
 
  Among other things, FDICIA requires the federal banking regulators to take
prompt corrective action in respect of FDIC-insured depository institutions
that do not meet minimum capital requirements. FDICIA establishes five capital
tiers: "well capitalized," "adequately capitalized," "undercapitalized,"
"significantly undercapitalized" and "critically undercapitalized." A
depository institution's capital tier will depend upon how its capital levels
compare to various relevant capital measures and certain other factors, as
established by regulation. Under applicable regulations, an FDIC-insured bank
is defined to be well capitalized if it maintains a Leverage Ratio of at least
5%, a Tier 1 capital ratio of at least 6% and a Total Capital Ratio of at
least 10% and is not otherwise in a "troubled condition" as specified by its
appropriate federal regulatory agency. A bank is generally considered to be
adequately capitalized if it is not defined to be well capitalized but meets
all of its minimum capital requirements, i.e., if it has a Total Capital Ratio
of 8% or greater, a Tier 1 capital ratio of 4% or greater and a Leverage Ratio
of 4% or greater (or a Leverage Ratio of 3% or greater if the institution is
rated composite 1 in its most recent report of examination, subject to
appropriate federal banking agency guidelines). A bank will be considered
undercapitalized if it fails to meet any minimum required measure,
significantly undercapitalized if it is significantly below such measure and
critically undercapitalized if it maintains a level of tangible equity capital
equal to or less than 2% of total assets. A bank may be deemed to be in a
capitalization category that is lower than is indicated by its actual capital
position if it receives an unsatisfactory examination rating.
 
  FDICIA generally prohibits an FDIC-insured depository institution from
making any capital distribution (including payment of dividends) or paying any
management fee to its holding company if the depository institution would
thereafter be undercapitalized. Undercapitalized depository institutions are
subject to growth limitations and are required to submit a capital restoration
plan. The federal banking agencies may not accept a capital plan without
determining, among other things, that the plan is based on realistic
assumptions and is likely to succeed in restoring the depository institution's
capital. In addition, for an undercapitalized depository institution's capital
restoration plan to be acceptable, its holding company must guarantee the
capital plan up to
 
                                       7
<PAGE>
 
an amount equal to the lesser of 5% of the depository institution's assets at
the time it became undercapitalized or the amount of the capital deficiency
when the institution fails to comply with the plan. In the event of the parent
holding company's bankruptcy, such guarantee would take priority over the
parent's general unsecured creditors. If a depository institution fails to
submit an acceptable plan, it is treated as if it is significantly
undercapitalized.
 
  Significantly undercapitalized depository institutions may be subject to a
number of requirements and restrictions, including orders to sell sufficient
voting stock to become adequately capitalized, requirements to reduce total
assets and cessation of receipt of deposits from correspondent banks.
Critically undercapitalized depository institutions are subject to appointment
of a receiver or conservator.
 
  At September 30, 1996, the Bank and each of the Corporation's other
subsidiary banks met or exceeded the minimum regulatory ratios that are one of
the conditions for them to be considered to be well capitalized. At September
30, 1996, the Bank had leverage, risk-based total capital and risk-based Tier
1 capital ratios of 6.15%, 11.34% and 8.19%, respectively.
 
FDIA
 
  Under the FDIA, a depository institution insured by the FDIC can be held
liable for any loss incurred by, or reasonably expected to be incurred by, the
FDIC after August 9, 1989 in connection with (i) the default of a commonly
controlled FDIC-insured depository institution or (ii) any assistance provided
by the FDIC to a commonly controlled FDIC-insured depository institution in
danger of default. "Default" is defined generally as the appointment of a
conservator or receiver, and "in danger of default" is defined generally as
the existence of certain conditions indicating that a "default" is likely to
occur in the absence of regulatory assistance.
 
INTERSTATE BANKING AND BRANCHING LEGISLATION
 
  The Riegle-Neal Interstate Banking and Branching Efficiency Act of 1994
("IBBEA") permits bank holding companies, with Federal Reserve approval, to
acquire banks located in states other than the bank holding company's home
state without regard to whether the transaction is prohibited under state law.
In addition, commencing June 1, 1997, national banks and state banks with
different home states will be permitted to merge across state lines, with the
approval of the appropriate federal banking agency, unless the home state of a
participating bank passes legislation between the date of enactment of IBBEA
and May 31, 1997 expressly prohibiting interstate mergers. IBBEA further
provides that states may enact laws permitting interstate bank merger
transactions prior to June 1, 1997. A bank may establish and operate a de novo
branch in a state in which the bank does not maintain a branch if that state
expressly permits de novo branching. Once a bank has established branches in a
state through an interstate merger transaction, the bank may establish and
acquire additional branches at any location in the state where any bank
involved in the interstate merger transaction could have established or
acquired branches under applicable federal or state law. A bank that has
established a branch in a state through de novo branching may establish and
acquire additional branches in such state in the same manner and to the same
extent as a bank having a branch in such state as a result of an interstate
merger. If a state opts out of interstate branching within the specified time
period, no bank in any other state may establish a branch in the state which
has opted out, whether through an acquisition or de novo.
 
PROPOSED LEGISLATION
 
  Various bills have been introduced into the United States Congress that
would repeal, in some respects, the provisions of the Glass-Steagall Act which
prohibit certain banking organizations from engaging in certain securities
activities and the provisions of the BHC Act, which prohibit affiliations
between banking organizations and nonbanking organizations. The Corporation
cannot determine the ultimate effect that potential legislation, if enacted,
or implementing regulations, would have upon its financial condition or
results of operations.
 
  Other proposals to change the laws and regulations governing the banking
industry are frequently introduced in Congress, in the state legislatures and
before the various bank regulatory agencies. The likelihood and timing of any
such changes and the impact such changes might have on the Corporation and its
subsidiaries, however, cannot be determined at this time.
 
                                       8
<PAGE>
 
                                  THE ISSUERS
   
  Each Issuer is a statutory business trust created under Delaware law
pursuant to (i) a trust agreement executed by the Corporation, as Depositor,
the Delaware Trustee (as defined herein) and the Administrative Trustee named
therein and (ii) a certificate of trust filed with the Delaware Secretary of
State. Each trust agreement will be amended and restated in its entirety
(each, as so amended and restated, a "Trust Agreement") substantially in the
form filed as an exhibit to the Registration Statement of which this
Prospectus forms a part. Each Trust Agreement will be qualified as an
indenture under the Trust Indenture Act of 1939, as amended (the "Trust
Indenture Act"). Each Issuer exists for the exclusive purposes of (i) issuing
and selling its Trust Securities, (ii) using the proceeds from the sale of
such Trust Securities to acquire a series of Corresponding Junior Subordinated
Debentures issued by the Corporation, and (iii) engaging in only those other
activities necessary or incidental thereto (such as registering the transfer
of the Trust Securities). Accordingly, the Corresponding Junior Subordinated
Debentures and the right to reimbursement of expenses under the related
Expense Agreement will be the sole assets of each Issuer, and payments under
the Corresponding Junior Subordinated Debentures and the related Expense
Agreement will be the sole revenue of each Issuer.     
 
  All of the Common Securities of each Issuer will be owned by the
Corporation. The Common Securities of an Issuer will rank pari passu, and
payments will be made thereon pro rata, with the Preferred Securities of such
Issuer, except that upon the occurrence and continuance of an event of default
under a Trust Agreement resulting from an event of default under the
Indenture, the rights of the Corporation, as holder of the Common Securities,
to payment in respect of Distributions and payments upon liquidation or
redemption will be subordinated to the rights of the holders of the Preferred
Securities of such Issuer. See "Description of Preferred Securities--
Subordination of Common Securities." The Corporation will acquire Common
Securities in an aggregate Liquidation Amount equal to not less than 3% of the
total capital of each Issuer.
 
  Unless otherwise specified in the applicable Prospectus Supplement, each
Issuer has a term of approximately 55 years, but may terminate earlier as
provided in the applicable Trust Agreement. Each Issuer's business and affairs
are conducted by its trustees, each appointed by the Corporation as holder of
the Common Securities. The trustees for each Issuer will be The First National
Bank of Chicago, as the Property Trustee (the "Property Trustee"), First
Chicago Delaware Inc., as the Delaware Trustee (the "Delaware Trustee"), and
two individual trustees (the "Administrative Trustees") who are employees or
officers of or affiliated with the Corporation (collectively, the "Issuer
Trustees"). The First National Bank of Chicago, as Property Trustee, will act
as sole indenture trustee under each Trust Agreement for purposes of
compliance with the Trust Indenture Act. The First National Bank of Chicago
will also act as trustee under the Guarantees and the Indenture (each as
defined herein). See "Description of Guarantees" and "Description of Junior
Subordinated Debentures." The holder of the Common Securities of an Issuer, or
the holders of a majority in Liquidation Amount of the Related Preferred
Securities if an event of default under the Trust Agreement for such Issuer
has occurred and is continuing, will be entitled to appoint, remove or replace
the Property Trustee and/or the Delaware Trustee for such Issuer. In no event
will the holders of the Preferred Securities have the right to vote to
appoint, remove or replace the Administrative Trustees; such voting rights are
vested exclusively in the holder of the Common Securities. The duties and
obligations of each Issuer Trustee are governed by the applicable Trust
Agreement. The Corporation will pay all fees and expenses related to each
Issuer and the offering of the Preferred Securities and will pay, directly or
indirectly, all ongoing costs, expenses and liabilities of each Issuer.
 
  The principal executive office of each issuer is Fifty South LaSalle Street,
Chicago, Illinois 60675, and its telephone number is (312) 630-6000.
 
                                       9
<PAGE>
 
                                USE OF PROCEEDS
 
  Except as otherwise set forth in the applicable Prospectus Supplement, the
Corporation intends to use the proceeds from the sale of its Junior
Subordinated Debentures (including Corresponding Junior Subordinated
Debentures issued to the Issuers in connection with the investment by the
Issuers of all of the proceeds from the sale of Preferred Securities) for
general corporate purposes.
 
                 DESCRIPTION OF JUNIOR SUBORDINATED DEBENTURES
 
  The Junior Subordinated Debentures are to be issued in one or more series
under a Junior Subordinated Indenture, as supplemented from time to time (as
so supplemented, the "Indenture"), between the Corporation and The First
National Bank of Chicago, as trustee (the "Debenture Trustee"). This summary
of certain terms and provisions of the Junior Subordinated Debentures,
Corresponding Junior Subordinated Debentures and the Indenture, which
summarizes the material provisions thereof, does not purport to be complete
and is subject to, and is qualified in its entirety by reference to, the
Indenture, the form of which is filed as an exhibit to the Registration
Statement of which this Prospectus forms a part, and to the Trust Indenture
Act, to each of which reference is hereby made. The Indenture is qualified
under the Trust Indenture Act. Whenever particular defined terms of the
Indenture (as supplemented or amended from time to time) are referred to
herein or in a Prospectus Supplement, such defined terms are incorporated
herein or therein by reference.
 
GENERAL
 
  Each series of Junior Subordinated Debentures will rank pari passu with all
other series of Junior Subordinated Debentures and will be unsecured and
subordinate and junior in right of payment to the extent and in the manner set
forth in the Indenture to all Senior Debt (as defined below) of the
Corporation. See "--Subordination." The Corporation is a non-operating holding
company and almost all of the operating assets of the Corporation and its
consolidated subsidiaries are owned by such subsidiaries. The Corporation
relies primarily on dividends from such subsidiaries to meet its obligations.
See "Certain Regulatory Considerations--Dividends and Loans or Advances."
Because the Corporation is a holding company, the right of the Corporation to
participate in any distribution of assets of any subsidiary upon such
subsidiary's liquidation or reorganization or otherwise, is subject to the
prior claims of creditors of the subsidiary, except to the extent the
Corporation may itself be recognized as a creditor of that subsidiary.
Accordingly, the Junior Subordinated Debentures will be effectively
subordinated to all existing and future liabilities of the Corporation's
subsidiaries, and holders of Junior Subordinated Debentures should look only
to the assets of the Corporation for payments on the Junior Subordinated
Debentures. Except as otherwise provided in the applicable Prospectus
Supplement, the Indenture does not limit the incurrence or issuance of other
secured or unsecured debt of the Corporation, including Senior Debt, whether
under the Indenture, any other existing indenture or any other indenture that
the Corporation may enter into in the future or otherwise. See "--
Subordination" and the Prospectus Supplement relating to any offering of
Preferred Securities or Junior Subordinated Debentures.
 
  The Junior Subordinated Debentures will be issuable in one or more series
pursuant to an indenture supplemental to the Indenture or a resolution of the
Corporation's Board of Directors or a committee thereof.
 
  The applicable Prospectus Supplement or Prospectus Supplements will describe
the following terms of the Junior Subordinated Debentures: (1) the title of
the Junior Subordinated Debentures; (2) any limit upon the aggregate principal
amount of the Junior Subordinated Debentures; (3) the date or dates on which
the principal of the Junior Subordinated Debentures is payable (the "Stated
Maturity") or the method of determination thereof; (4) the rate or rates, if
any, at which the Junior Subordinated Debentures shall bear interest, the
dates on
 
                                      10
<PAGE>
 
which any such interest shall be payable (the "Interest Payment Dates"), the
right, if any, of the Corporation to defer or extend an Interest Payment Date,
and the record dates for any interest payable on any Interest Payment Date or
the method by which any of the foregoing shall be determined; (5) the place or
places where, subject to the terms of the Indenture as described below under
"--Payment and Paying Agents," the principal of and premium, if any, and
interest on the Junior Subordinated Debentures will be payable and where,
subject to the terms of the Indenture as described below under "--
Denominations, Registration and Transfer," the Junior Subordinated Debentures
may be presented for registration of transfer or exchange and the place or
places where notices and demands to or upon the Corporation in respect of the
Junior Subordinated Debentures and the Indentures may be made ("Place of
Payment"); (6) any period or periods within which or date or dates on which,
the price or prices at which and the terms and conditions upon which Junior
Subordinated Debentures may be redeemed, in whole or in part, at the option of
the Corporation or a holder thereof; (7) the obligation or the right, if any,
of the Corporation or a holder thereof to redeem, purchase or repay the Junior
Subordinated Debentures and the period or periods within which, the price or
prices at which, the currency or currencies (including currency unit or units)
in which and the other terms and conditions upon which the Junior Subordinated
Debentures shall be redeemed, repaid or purchased, in whole or in part,
pursuant to such obligation; (8) the denominations in which any Junior
Subordinated Debentures shall be issuable if other than denominations of $25
and any integral multiple thereof; (9) if other than in U.S. Dollars, the
currency or currencies (including currency unit or units) in which the
principal of (and premium, if any) and interest and Additional Interest, if
any, on the Junior Subordinated Debentures shall be payable, or in which the
Junior Subordinated Debentures shall be denominated; (10) any additions,
modifications or deletions in the events of default under the Indenture or
covenants of the Corporation specified in the Indenture with respect to the
Junior Subordinated Debentures; (11) if other than the principal amount
thereof, the portion of the principal amount of Junior Subordinated Debentures
that shall be payable upon declaration of acceleration of the maturity
thereof; (12) any additions or changes to the Indenture with respect to a
series of Junior Subordinated Debentures as shall be necessary to permit or
facilitate the issuance of such series in bearer form, registrable or not
registrable as to principal, and with or without interest coupons; (13) any
index or indices used to determine the amount of payments of principal of and
premium, if any, on the Junior Subordinated Debentures and the manner in which
such amounts will be determined; (14) the terms and conditions relating to the
issuance of a temporary Global Security representing all of the Junior
Subordinated Debentures of such series and the exchange of such temporary
Global Security for definitive Junior Subordinated Debentures of such series;
(15) subject to the terms described herein under "--Global Junior Subordinated
Debentures," whether the Junior Subordinated Debentures of the series shall be
issued in whole or in part in the form of one or more Global Securities and,
in such case, the Depositary for such Global Securities, which Depositary
shall be a clearing agency registered under the Exchange Act; (16) the
appointment of any paying agent or agents; (17) the terms and conditions of
any obligation or right of the Corporation or a holder to convert or exchange
the Junior Subordinated Debentures into Preferred Securities; (18) the form of
Trust Agreement, Guarantee Agreement and Expense Agreement, if applicable;
(19) the relative degree, if any, to which such Junior Subordinated Debentures
of the series shall be senior to or be subordinated to other series of such
Junior Subordinated Debentures or other indebtedness of the Corporation in
right of payment, whether such other series of Junior Subordinated Debentures
or other indebtedness are outstanding or not; and (20) any other terms of the
Junior Subordinated Debentures not inconsistent with the provisions of the
Indenture.
 
  Junior Subordinated Debentures may be sold at a substantial discount below
their stated principal amount, bearing no interest or interest at a rate which
at the time of issuance is below market rates. Certain United States federal
income tax consequences and special considerations applicable to any such
Junior Subordinated Debentures will be described in the applicable Prospectus
Supplement.
 
  If the purchase price of any of the Junior Subordinated Debentures is
payable in one or more foreign currencies or currency units or if any Junior
Subordinated Debentures are denominated in one or more foreign currencies or
currency units or if the principal of, premium, if any, or interest, if any,
on any Junior Subordinated Debentures is payable in one or more foreign
currencies or currency units, the restrictions, elections, certain United
States federal income tax consequences, specific terms and other information
with respect to such series
 
                                      11
<PAGE>
 
of Junior Subordinated Debentures and such foreign currency or currency units
will be set forth in the applicable Prospectus Supplement.
 
  If any index is used to determine the amount of payments of principal of,
premium, if any, or interest on any series of Junior Subordinated Debentures,
special United States federal income tax, accounting and other considerations
applicable thereto will be described in the applicable Prospectus Supplement.
 
DENOMINATIONS, REGISTRATION AND TRANSFER
 
  Unless otherwise specified in the applicable Prospectus Supplement, the
Junior Subordinated Debentures will be issuable only in registered form
without coupons in denominations of $25 and any integral multiple thereof.
Junior Subordinated Debentures of any series will be exchangeable for other
Junior Subordinated Debentures of the same issue and series, of any authorized
denominations, of a like aggregate principal amount, of the same original
issue date and stated maturity and bearing the same interest rate.
 
  Junior Subordinated Debentures may be presented for exchange as provided
above, and may be presented for registration of transfer (with the form of
transfer endorsed thereon, or a satisfactory written instrument of transfer,
duly executed), at the office of the appropriate securities registrar or at
the office of any transfer agent designated by the Corporation for such
purpose with respect to any series of Junior Subordinated Debentures and
referred to in the applicable Prospectus Supplement, without service charge
and upon payment of any taxes and other governmental charges as described in
the Indenture. The Corporation will appoint the Trustee as securities
registrar under the Indenture. If the applicable Prospectus Supplement refers
to any transfer agents (in addition to the securities registrar) initially
designated by the Corporation with respect to any series of Junior
Subordinated Debentures, the Corporation may at any time rescind the
designation of any such transfer agent or approve a change in the location
through which any such transfer agent acts, provided that the Corporation
maintains a transfer agent in each place of payment for such series. The
Corporation may at any time designate additional transfer agents with respect
to any series of Junior Subordinated Debentures.
 
  In the event of any redemption, neither the Corporation nor the Debenture
Trustee shall be required to (i) issue, register the transfer of or exchange
Junior Subordinated Debentures of any series during the period beginning at
the opening of business 15 days before the day of selection for redemption of
Junior Subordinated Debentures of that series and ending at the close of
business on the day of mailing of the relevant notice of redemption or (ii)
transfer or exchange any Junior Subordinated Debentures so selected for
redemption, except, in the case of any Junior Subordinated Debentures being
redeemed in part, any portion thereof not to be redeemed.
 
GLOBAL JUNIOR SUBORDINATED DEBENTURES
 
  The Junior Subordinated Debentures of a series may be issued in whole or in
part in the form of one or more Global Junior Subordinated Debentures that
will be deposited with, or on behalf of, a depositary (the "Depositary")
identified in the Prospectus Supplement relating to such series. Global Junior
Subordinated Debentures may be issued only in fully registered form and in
either temporary or permanent form. Unless and until it is exchanged in whole
or in part for the individual Junior Subordinated Debentures represented
thereby, a Global Junior Subordinated Debenture may not be transferred except
as a whole by the Depositary for such Global Junior Subordinated Debenture to
a nominee of such Depositary or by a nominee of such Depositary to such
Depositary or another nominee of such Depositary or by the Depositary or any
nominee to a successor Depositary or any nominee of such successor.
 
  The specific terms of the depositary arrangement with respect to a series of
Junior Subordinated Debentures will be described in the Prospectus Supplement
relating to such series. The Corporation anticipates that the following
provisions will generally apply to depositary arrangements. See also "Book-
Entry Issuance."
 
  Upon the issuance of a Global Junior Subordinated Debenture, and the deposit
of such Global Junior Subordinated Debenture with or on behalf of the
Depositary, the Depositary for such Global Junior Subordinated
 
                                      12
<PAGE>
 
Debenture or its nominee will credit, on its book-entry registration and
transfer system, the respective principal amounts of the individual Junior
Subordinated Debentures represented by such Global Junior Subordinated
Debenture to the accounts of persons that have accounts with such Depositary
("Participants"). Such accounts shall be designated by the dealers,
underwriters or agents with respect to such Junior Subordinated Debentures or
by the Corporation if such Junior Subordinated Debentures are offered and sold
directly by the Corporation. Ownership of beneficial interests in a Global
Junior Subordinated Debenture will be limited to Participants or persons that
may hold interests through Participants. Ownership of beneficial interests in
such Global Junior Subordinated Debenture will be shown on, and the transfer
of that ownership will be effected only through, records maintained by the
applicable Depositary or its nominee (with respect to interests of
Participants) and the records of Participants (with respect to interests of
persons who hold through Participants). The laws of some states require that
certain purchasers of securities take physical delivery of such securities in
definitive form. Such limits and such laws may impair the ability to transfer
beneficial interests in a Global Junior Subordinated Debenture.
 
  So long as the Depositary for a Global Junior Subordinated Debenture, or its
nominee, is the registered owner of such Global Junior Subordinated Debenture,
such Depositary or such nominee, as the case may be, will be considered the
sole owner or holder of the Junior Subordinated Debentures represented by such
Global Junior Subordinated Debenture for all purposes under the Indenture
governing such Junior Subordinated Debentures. Except as provided below,
owners of beneficial interests in a Global Junior Subordinated Debenture will
not be entitled to have any of the individual Junior Subordinated Debentures
of the series represented by such Global Junior Subordinated Debenture
registered in their names, will not receive or be entitled to receive physical
delivery of any such Junior Subordinated Debentures of such series in
definitive form and will not be considered the owners or holders thereof under
the Indenture.
 
  Payments of principal of (and premium, if any) and interest on individual
Junior Subordinated Debentures represented by a Global Junior Subordinated
Debenture registered in the name of a Depositary or its nominee will be made
to the Depositary or its nominee, as the case may be, as the registered owner
of the Global Junior Subordinated Debenture representing such Junior
Subordinated Debentures. None of the Corporation, the Debenture Trustee, any
Paying Agent, or the Securities Registrar for such Junior Subordinated
Debentures will have any responsibility or liability for any aspect of the
records relating to or payments made on account of beneficial ownership
interests of the Global Junior Subordinated Debenture representing such Junior
Subordinated Debentures or for maintaining, supervising or reviewing any
records relating to such beneficial ownership interests.
 
  The Corporation expects that the Depositary for a series of Junior
Subordinated Debentures or its nominee, upon receipt of any payment of
principal, premium, if any, or interest in respect of a permanent Global
Junior Subordinated Debenture representing any of such Junior Subordinated
Debentures, immediately will credit Participants' accounts with payments in
amounts proportionate to their respective beneficial interest in the principal
amount of such Global Junior Subordinated Debenture for such Junior
Subordinated Debentures as shown on the records of such Depositary or its
nominee. The Corporation also expects that payments by Participants to owners
of beneficial interests in such Global Junior Subordinated Debenture held
through such Participants will be governed by standing instructions and
customary practices, as is now the case with securities held for the accounts
of customers in bearer form or registered in "street name." Such payments will
be the responsibility of such Participants.
 
  Unless otherwise specified in the applicable Prospectus Supplement, if a
Depositary for a series of Junior Subordinated Debentures is at any time
unwilling, unable or ineligible to continue as depositary and the Corporation
is unable to locate a qualified successor, the Corporation will issue
individual Junior Subordinated Debentures of such series in exchange for the
Global Junior Subordinated Debenture representing such series of Junior
Subordinated Debentures. In addition, the Corporation may at any time and in
its sole discretion, subject to any limitations described in the Prospectus
Supplement relating to such Junior Subordinated Debentures, determine not to
have any Junior Subordinated Debentures of such series represented by one or
more Global Junior Subordinated Debentures and, in such event, will issue
certificated Junior Subordinated Debentures of
 
                                      13
<PAGE>
 
such series in exchange for the Global Junior Subordinated Debenture or
Securities representing such series of Junior Subordinated Debentures.
Further, if the Corporation so specifies with respect to the Junior
Subordinated Debentures of a series, an owner of a beneficial interest in a
Global Junior Subordinated Debenture representing Junior Subordinated
Debentures of such series may, on terms acceptable to the Corporation, the
Debenture Trustee and the Depositary for such Global Junior Subordinated
Debenture, receive certificated Junior Subordinated Debentures of such series
in exchange for such beneficial interests, subject to any limitations
described in the Prospectus Supplement relating to such Junior Subordinated
Debentures. In any such instance, an owner of a beneficial interest in a
Global Junior Subordinated Debenture will be entitled to physical delivery of
certificated Junior Subordinated Debentures of the series represented by such
Global Junior Subordinated Debenture equal in principal amount to such
beneficial interest and to have such Junior Subordinated Debentures registered
in its name. Individual Junior Subordinated Debentures of such series so
issued will be issued in denominations, unless otherwise specified by the
Corporation, of $25 and integral multiples thereof.
 
PAYMENT AND PAYING AGENTS
 
  Unless otherwise indicated in the applicable Prospectus Supplement, payment
of principal of (and premium, if any) and any interest on Junior Subordinated
Debentures will be made at the office of the Debenture Trustee in the City of
Chicago, Illinois or at the office of such paying agent or paying agents as
the Corporation may designate from time to time, except that at the option of
the Corporation payment of any interest may be made (i) except in the case of
Global Junior Subordinated Debentures, by check mailed to the address of the
Person entitled thereto as such address shall appear in the securities
register or (ii) by transfer to an account maintained by the person entitled
thereto as specified in the securities register, provided that proper transfer
instructions have been received by the Regular Record Date. Unless otherwise
indicated in the applicable Prospectus Supplement, payment of any interest on
Junior Subordinated Debentures will be made to the person in whose name such
Junior Subordinated Debenture is registered at the close of business on the
Regular Record Date for such interest, except in the case of Defaulted
Interest. The Corporation may at any time designate additional Paying Agents
or rescind the designation of any paying agent; however the Corporation will
at all times be required to maintain a paying agent in each place of payment
for each series of Junior Subordinated Debentures.
 
  Any moneys deposited with the Debenture Trustee or any paying agent, or then
held by the Corporation in trust, for the payment of the principal of (and
premium, if any) or interest on any Junior Subordinated Debenture and
remaining unclaimed for two years after such principal (and premium, if any)
or interest has become due and payable shall, at the request of the
Corporation, be repaid to the Corporation and the holder of such Junior
Subordinated Debenture shall thereafter look, as a general unsecured creditor,
only to the Corporation for payment thereof.
 
OPTION TO DEFER INTEREST PAYMENTS
 
  If provided in the applicable Prospectus Supplement, the Corporation will
have the right at any time and from time to time during the term of any series
of Junior Subordinated Debentures to defer payment of interest for up to such
number of consecutive interest payment periods as may be specified in the
applicable Prospectus Supplement (each, an "Extension Period"), subject to the
terms, conditions and covenants, if any, specified in such Prospectus
Supplement, provided that such Extension Period may not extend beyond the
Stated Maturity of such series of Junior Subordinated Debentures. Certain
United States federal income tax consequences and special considerations
applicable to any such Junior Subordinated Debentures will be described in the
applicable Prospectus Supplement.
 
REDEMPTION
 
  Unless otherwise indicated in the applicable Prospectus Supplement, Junior
Subordinated Debentures will not be subject to any sinking fund.
 
  Unless otherwise indicated in the applicable Prospectus Supplement, the
Corporation may, at its option and subject to receipt of the prior approval of
the Federal Reserve, if then required under applicable Federal Reserve
 
                                      14
<PAGE>
 
capital guidelines or policies, redeem the Junior Subordinated Debentures of
any series in whole at any time or in part from time to time. If the Junior
Subordinated Debentures of any series are so redeemable only on or after a
specified date or upon the satisfaction of additional conditions, the
applicable Prospectus Supplement will specify such date or describe such
conditions. Junior Subordinated Debentures in denominations larger than $25
may be redeemed in part but only in integral multiples of $25. Except as
otherwise specified in the applicable Prospectus Supplement, the redemption
price for any Junior Subordinated Debenture so redeemed shall equal any
accrued and unpaid interest (including Additional Interest) thereon to the
redemption date, plus 100% of the principal amount thereof.
 
  Except as otherwise specified in the applicable Prospectus Supplement, if a
Tax Event (as defined below) in respect of a series of Junior Subordinated
Debentures or a Capital Treatment Event (as defined below) shall occur and be
continuing, the Corporation may, at its option and subject to receipt of the
prior approval of the Federal Reserve, if then required under applicable
Federal Reserve capital guidelines or policies, redeem such series of Junior
Subordinated Debentures in whole (but not in part) at any time within 90 days
following the occurrence of such Tax Event or Capital Treatment Event, at a
redemption price equal to 100% of the principal amount of such Junior
Subordinated Debentures then outstanding plus accrued and unpaid interest to
the date fixed for redemption, except as otherwise specified in the applicable
Prospectus Supplement.
 
  "Tax Event" means the receipt by an Issuer of a series of Preferred
Securities of an opinion of counsel experienced in such matters to the effect
that, as a result of any amendment to, or change (including any announced
prospective change) in, the laws (or any regulations thereunder) of the United
States or any political subdivision or taxing authority thereof or therein, or
as a result of any official administrative pronouncement or judicial decision
interpreting or applying such laws or regulations, which amendment or change
is effective or which pronouncement or decision is announced on or after the
date of issuance of such Preferred Securities under the Trust Agreement, there
is more than an insubstantial risk that (i) such Issuer is, or will be within
90 days of the date of such opinion, subject to United States federal income
tax with respect to income received or accrued
on the corresponding series of Corresponding Junior Subordinated Debentures,
(ii) interest payable by the Corporation on such series of Corresponding
Junior Subordinated Debentures is not, or within 90 days of the date of such
opinion, will not be, deductible by the Corporation, in whole or in part, for
United States federal income tax purposes, or (iii) such Issuer is, or will be
within 90 days of the date of such opinion, subject to more than a de minimis
amount of other taxes, duties or other governmental charges.
 
  A "Capital Treatment Event" means the reasonable determination by the
Corporation that, as a result of the occurrence of any amendment to, or change
(including any announced prospective change) in, the laws (or any rules or
regulations thereunder) of the United States or any political subdivision
thereof or therein, or as a result of any official or administrative
pronouncement or action or judicial decision interpreting or applying such
laws, rules or regulations, which amendment or change is effective or which
pronouncement, action or decision is announced on or after the date of
issuance of the Preferred Securities, there is more than an insubstantial risk
that the Corporation will not be entitled to treat an amount equal to the
aggregate Liquidation Amount of the Preferred Securities as "Tier 1" capital
(or the then equivalent thereof) for purposes of the capital adequacy
guidelines of the Federal Reserve, as then in effect and applicable to the
Corporation.
 
  Notice of any redemption will be mailed at least 45 days but not more than
75 days before the redemption date to each Holder of Junior Subordinated
Debentures to be redeemed at its registered address. Unless the Corporation
defaults in payment of the redemption price, on and after the redemption date
interest shall cease to accrue on such Junior Subordinated Debentures or
portions thereof called for redemption.
 
RESTRICTIONS ON CERTAIN PAYMENTS
 
  The Corporation will also covenant, as to each series of Junior Subordinated
Debentures, that it will not, and will not permit any subsidiary of the
Corporation to, (i) declare or pay any dividends or distributions on, or
redeem, purchase or acquire, or make a liquidation payment with respect to,
any of the Corporation's capital stock or (ii) make any payment of principal
of or interest or premium, if any, on or repay or repurchase or redeem any
 
                                      15
<PAGE>
 
debt securities of the Corporation (including other Junior Subordinated
Debentures) that rank pari passu in all respects with or junior in interest to
the Junior Subordinated Debentures (other than (a) repurchases, redemptions or
other acquisitions of shares of capital stock of the Corporation in connection
with any employment contract, benefit plan or other similar arrangement with
or for the benefit of one or more employees, officers, directors or
consultants, in connection with a dividend reinvestment or stockholder stock
purchase plan or in connection with the issuance of capital stock of the
Corporation (or securities convertible into or exercisable for such capital
stock) as consideration in an acquisition transaction entered into prior to
the applicable Extension Period, (b) as a result of any exchange or conversion
of any class or series of the Corporation's capital stock (or any capital
stock of a subsidiary of the Corporation) for any class or series of the
Corporation's capital stock or of any class or series of the Corporation's
indebtedness for any class or series of the Corporation's capital stock, (c)
the purchase of fractional interests in shares of the Corporation's capital
stock pursuant to the conversion or exchange provisions of such capital stock
or the security being converted or exchanged, (d) any declaration of a
dividend in connection with any stockholder rights plan, or the issuance of
rights, stock or other property under any stockholder rights plan, or the
redemption or repurchase of rights pursuant thereto, or (e) any dividend in
the form of stock, warrants, options or other rights where the dividend stock
or the stock issuable upon exercise of such warrants, options or other rights
is the same stock as that on which the dividend is being paid or ranks pari
passu with or junior to such stock), if at such time (i) there shall have
occurred any event of which the Corporation has actual knowledge that (a) with
the giving of notice or the lapse of time, or both, would constitute an "Event
of Default" under the Indenture with respect to the Junior Subordinated
Debentures of such series and (b) in respect of which the Corporation shall
not have taken reasonable steps to cure, (ii) if such Junior Subordinated
Debentures are held by an Issuer of a series of Related Preferred Securities,
the Corporation shall be in default with respect to its payment of any
obligations under the Guarantee relating to such Related Preferred Securities
or (iii) the Corporation shall have given notice of its selection of an
Extension Period as provided in the Indenture with respect to the Junior
Subordinated Debentures of such series and shall not have rescinded such
notice, or such Extension Period, or any extension thereof, shall be
continuing.
 
MODIFICATION OF INDENTURE
 
  From time to time the Corporation and the Debenture Trustee may, without the
consent of the holders of any series of Junior Subordinated Debentures, amend,
waive or supplement the Indenture for specified purposes, including, among
other things, curing ambiguities, defects or inconsistencies (provided that
any such action does not materially adversely affect the interest of the
holders of any series of Junior Subordinated Debentures or, in the case of
Corresponding Junior Subordinated Debentures, the holders of the Related
Preferred Securities so long as they remain outstanding) and qualifying, or
maintaining the qualification of, the Indenture under the Trust Indenture Act.
The Indenture contains provisions permitting the Corporation and the Debenture
Trustee, with the consent of the holders of not less than a majority in
principal amount of each outstanding series of Junior Subordinated Debentures
affected, to modify the Indenture in a manner affecting adversely the rights
of the holders of such series of the Junior Subordinated Debentures in any
material respect; provided, that no such modification may, without the consent
of the holder of each outstanding Junior Subordinated Debenture so affected,
(i) change the Stated Maturity of any series of Junior Subordinated Debentures
(except as otherwise specified in the applicable Prospectus Supplement), or
reduce the principal amount thereof, or reduce the rate or extend the time of
payment of interest thereon or (ii) reduce the percentage of principal amount
of Junior Subordinated Debentures of any series, the holders of which are
required to consent to any such modification of the Indenture, provided that,
in the case of Corresponding Junior Subordinated Debentures, so long as any of
the Related Preferred Securities remain outstanding, (a) no such modification
may be made that adversely affects the holders of such Preferred Securities in
any material respect, and no termination of the Indenture may occur, and no
waiver of any event of default or compliance with any covenant under the
Indenture may be effective, without the prior consent of the holders of at
least a majority of the aggregate Liquidation Amount of all outstanding
Related Preferred Securities affected unless and until the principal of the
Corresponding Junior Subordinated Debentures and all accrued and unpaid
interest thereon have been paid in full and certain other conditions have been
satisfied and (b) where a consent under the Indenture would require the
consent of each holder of Corresponding Junior Subordinated Debentures, no
such consent will be given by the Property Trustee without the prior consent
of each holder of Related Preferred Securities.
 
                                      16
<PAGE>
 
  In addition, the Corporation and the Debenture Trustee may execute, without
the consent of any holder of Junior Subordinated Debentures, any supplemental
Indenture for the purpose of creating any new series of Junior Subordinated
Debentures.
 
DEBENTURE EVENTS OF DEFAULT
 
  The Indenture provides that any one or more of the following described
events with respect to a series of Junior Subordinated Debentures that has
occurred and is continuing constitutes a "Debenture Event of Default" with
respect to such series of Junior Subordinated Debentures:
 
    (i) failure for 30 days to pay any interest on such series of Junior
  Subordinated Debentures, including any Additional Interest in respect
  thereof, when due (subject to the deferral of any interest payment in the
  case of an Extension Period); or
 
    (ii) failure to pay any principal or premium, if any, on such series of
  Junior Subordinated Debentures when due whether at maturity or upon
  redemption; or
 
    (iii) failure to observe or perform any other covenants contained in the
  indenture for 90 days after written notice to the Corporation from the
  Debenture Trustee or the holders of at least 25% in aggregate outstanding
  principal amount of such affected series of outstanding Junior Subordinated
  Debentures; or
 
    (iv) certain events in bankruptcy, insolvency or reorganization of the
  Corporation.
 
  The holders of a majority in aggregate outstanding principal amount of
Junior Subordinated Debentures of each series affected have the right to
direct the time, method and place of conducting any proceeding for any remedy
available to the Debenture Trustee. The Debenture Trustee or the holders of
not less than 25% in aggregate outstanding principal amount of Junior
Subordinated Debentures of each series affected may declare the principal (or,
if the Junior Subordinated Debentures of such series are Discount Securities,
such portion of the principal amount as may be specified in a Prospectus
Supplement) due and payable immediately upon a Debenture Event of Default,
and, in the case of Corresponding Junior Subordinated Debentures, should the
Debenture Trustee or such holders of such Corresponding Junior Subordinated
Debentures fail to make such declaration, the holders of at least 25% in
aggregate Liquidation Amount of the Related Preferred Securities shall have
such right. The holders of a majority in aggregate outstanding principal
amount of Junior Subordinated Debentures of each series affected may annul
such declaration. In the case of Corresponding Junior Subordinated Debentures,
should the holders of such Corresponding Junior Subordinated Debentures fail
to annul such declaration and waive such default, the holders of a majority in
aggregate Liquidation Amount of the Related Preferred Securities shall have
such right.
 
  The holders of a majority in aggregate outstanding principal amount of each
series of Junior Subordinated Debentures affected thereby may, on behalf of
the holders of all the Junior Subordinated Debentures of such series, waive
any default, except a default in the payment of principal or interest
(including any Additional Interest) (unless such default has been cured and a
sum sufficient to pay all matured installments of interest (including any
Additional Interest) and principal due otherwise than by acceleration has been
deposited with the Debenture Trustee) or a default in respect of a covenant or
provision which under the Indenture cannot be modified or amended without the
consent of the holder of each outstanding Junior Subordinated Debenture of
such series. In the case of Corresponding Junior Subordinated Debentures,
should the holders of such Corresponding Junior Subordinated Debentures fail
to waive such default, the holders of a majority in aggregate Liquidation
Amount of the Related Preferred Securities shall have such right. The
Corporation is required to file annually with the Debenture Trustee a
certificate as to whether or not the Corporation is in compliance with all the
conditions and covenants applicable to it under the Indenture.
 
  In case a Debenture Event of Default shall occur and be continuing as to a
series of Corresponding Junior Subordinated Debentures, the Property Trustee
will have the right to declare the principal (or specified portion thereof) of
and the interest on such Corresponding Junior Subordinated Debentures, and any
other amounts payable under the Indenture, to be forthwith due and payable and
to enforce its other rights as a creditor with respect to such Corresponding
Junior Subordinated Debentures.
 
                                      17
<PAGE>
 
ENFORCEMENT OF CERTAIN RIGHTS BY HOLDERS OF PREFERRED SECURITIES
 
  If a Debenture Event of Default with respect to a series of Corresponding
Junior Subordinated Debentures has occurred and is continuing and such event
is attributable to the failure of the Corporation to pay interest or principal
on such Corresponding Junior Subordinated Debentures on the date such interest
or principal is due and payable, a holder of Preferred Securities may
institute a legal proceeding directly against the Corporation for enforcement
of payment to such holder of the principal of or interest (including any
Additional Interest) on such Corresponding Junior Subordinated Debentures
having a principal amount equal to the aggregate Liquidation Amount of the
Related Preferred Securities of such holder (a "Direct Action"). The
Corporation may not amend the Indenture to remove the foregoing right to bring
a Direct Action without the prior written consent of the holders of all of the
Preferred Securities outstanding. If the right to bring a Direct Action is
removed, the applicable Issuer may become subject to the reporting obligations
under the Exchange Act. The Corporation shall have the right under the
Indenture to set-off any payment made to such holder of Preferred Securities
by the Corporation in connection with a Direct Action.
 
  The holders of the Preferred Securities will not be able to exercise
directly any remedies other than those set forth in the preceding paragraph
available to the holders of the Junior Subordinated Debentures unless there
shall have been an event of default under the Trust Agreement. See
"Description of Preferred Securities--Events of Default; Notice."
 
CONSOLIDATION, MERGER, SALE OF ASSETS AND OTHER TRANSACTIONS
   
  The Indenture provides that the Corporation shall not consolidate with or
merge into any other entity or convey, transfer or lease its properties and
assets substantially as an entirety to any entity, and no entity shall
consolidate with or merge into the Corporation or convey, transfer or lease
its properties and assets substantially as an entirety to the Corporation,
unless (i) in case the Corporation consolidates with or merges into another
entity or conveys or transfers its properties and assets substantially as an
entirety to any Person, the successor entity is organized under the laws of
the United States or any state or the District of Columbia, and such successor
entity expressly assumes the Corporation's obligations on the Junior
Subordinated Debentures issued under the Indenture; (ii) immediately after
giving effect thereto, no Debenture Event of Default, and no event which,
after notice or lapse of time or both, would become a Debenture Event of
Default, shall have occurred and be continuing, and (iii) certain other
conditions as prescribed by the Indenture are met.     
 
  The general provisions of the Indenture do not afford holders of the Junior
Subordinated Debentures protection in the event of a highly leveraged or other
transaction involving the Corporation that may adversely affect holders of the
Junior Subordinated Debentures.
 
SATISFACTION AND DISCHARGE
 
  The Indenture provides that when, among other things, all Junior
Subordinated Debentures not previously delivered to the Debenture Trustee for
cancellation (i) have become due and payable or (ii) will become due and
payable at their Stated Maturity within one year, and the Corporation deposits
or causes to be deposited with the Debenture Trustee funds, in trust, for the
purpose and in an amount in the currency or currencies in which the Junior
Subordinated Debentures are payable sufficient to pay and discharge the entire
indebtedness on the Junior Subordinated Debentures not previously delivered to
the Debenture Trustee for cancellation, for the principal (and premium, if
any) and interest (including any Additional Interest) to the date of the
deposit or to the Stated Maturity, as the case may be, then the Indenture will
cease to be of further effect (except as to the Corporation's obligations to
pay all other sums due pursuant to the Indenture and to provide the officers'
certificates and opinions of counsel described therein), and the Corporation
will be deemed to have satisfied and discharged the Indenture.
 
                                      18
<PAGE>
 
CONVERSION OR EXCHANGE
 
  If and to the extent indicated in the applicable Prospectus Supplement, the
Junior Subordinated Debentures of any series may be convertible or
exchangeable into Junior Subordinated Debentures of another series or into
Preferred Securities of another series. The specific terms on which Junior
Subordinated Debentures of any series may be so converted or exchanged will be
set forth in the applicable Prospectus Supplement. Such terms may include
provisions for conversion or exchange, either mandatory, at the option of the
holder, or at the option of the Corporation, in which case the number of
shares of Preferred Securities or other securities to be received by the
holders of Junior Subordinated Debentures would be calculated as of a time and
in the manner stated in the applicable Prospectus Supplement.
 
SUBORDINATION
 
  The Junior Subordinated Debentures will be subordinate in right of payment,
to the extent set forth in the Indenture, to all Senior Debt (as defined
below) of the Corporation. If the Corporation defaults in the payment of any
principal, premium, if any, or interest, if any, or any other amount payable
on any Senior Debt when the same becomes due and payable, whether at maturity
or at a date fixed for redemption or by declaration of acceleration or
otherwise, then, unless and until such default has been cured or waived or has
ceased to exist or all Senior Debt has been paid, no direct or indirect
payment (in cash, property, securities, by set-off or otherwise) may be made
or agreed to be made on the Junior Subordinated Debentures, or in respect of
any redemption, repayment, retirement, purchase or other acquisition of any of
the Junior Subordinated Debentures.
 
  As used herein, "Senior Debt" means any obligation of the Corporation to its
creditors, whether now outstanding or subsequently incurred, other than any
obligation as to which, in the instrument creating or evidencing the
obligation or pursuant to which the obligation is outstanding, it is provided
that such obligation is not Senior Debt, but does not include trade accounts
payable and accrued liabilities arising in the ordinary course of business.
Senior Debt includes the Corporation's outstanding subordinated debt
securities and any subordinated debt securities issued in the future with
substantially similar subordination terms, but does not include the Junior
Subordinated Debentures of any series or any junior subordinated debt
securities issued in the future with subordination terms substantially similar
to those of the Junior Subordinated Debentures. Substantially all of the
existing indebtedness of the Corporation constitutes Senior Debt.
 
  In the event of (i) any insolvency, bankruptcy, receivership, liquidation,
reorganization, readjustment, composition or other similar proceeding relating
to the Corporation, its creditors or its property, (ii) any proceeding for the
liquidation, dissolution or other winding up of the Corporation, voluntary or
involuntary, whether or not involving insolvency or bankruptcy proceedings,
(iii) any assignment by the Corporation for the benefit of creditors or (iv)
any other marshalling of the assets of the Corporation, all Senior Debt
(including any interest thereon accruing after the commencement of any such
proceedings) shall first be paid in full before any payment or distribution,
whether in cash, securities or other property, shall be made on account of the
Junior Subordinated Debentures. In such event, any payment or distribution on
account of the Junior Subordinated Debentures, whether in cash, securities or
other property, that would otherwise (but for the subordination provisions) be
payable or deliverable in respect of the Junior Subordinated Debentures will
be paid or delivered directly to the holders of Senior Debt in accordance with
the priorities then existing among such holders until all Senior Debt
(including any interest thereon accruing after the commencement of any such
proceedings) has been paid in full.
 
  In the event of any such proceeding, after payment in full of all sums owing
with respect to Senior Debt, the holders of Junior Subordinated Debentures,
together with the holders of any obligations of the Corporation ranking on a
parity with the Junior Subordinated Debentures, will be entitled to be paid
from the remaining assets of the Corporation the amounts at the time due and
owing on the Junior Subordinated Debentures and such other obligations before
any payment or other distribution, whether in cash, property or otherwise,
will be made on account of any capital stock or obligations of the Corporation
ranking junior to the Junior Subordinated Debentures. If any payment or
distribution on account of the Junior Subordinated Debentures of any character
or
 
                                      19
<PAGE>
 
any security, whether in cash, securities or other property is received by any
holder of any Junior Subordinated Debentures in contravention of any of the
terms hereof and before all the Senior Debt has been paid in full, such
payment or distribution or security will be received in trust for the benefit
of, and must be paid over or delivered and transferred to, the holders of the
Senior Debt at the time outstanding in accordance with the priorities then
existing among such holders for application to the payment of all Senior Debt
remaining unpaid to the extent necessary to pay all such Senior Debt in full.
By reason of such subordination, in the event of the insolvency of the
Corporation, holders of Senior Debt may receive more, ratably, and holders of
the Junior Subordinated Debentures may receive less, ratably, than the other
creditors of the Corporation. Such subordination will not prevent the
occurrence of any Event of Default under the Indenture.
 
  The Indenture places no limitation on the amount of additional Senior Debt
that may be incurred by the Corporation. The Corporation expects from time to
time to incur additional indebtedness constituting Senior Debt.
 
TRUST EXPENSES
 
  Pursuant to the Expense Agreement for each series of Corresponding Junior
Subordinated Debentures, the Corporation will irrevocably and unconditionally
agree with each Issuer that holds Junior Subordinated Debentures that the
Corporation will pay to such Issuer, and reimburse such Issuer for, the full
amounts of any costs, expenses or liabilities of the Issuer, other than
obligations of the Issuer to pay to the holders of any Preferred Securities or
other similar interests in the Issuer the amounts due such holders pursuant to
the terms of the Preferred Securities or such other similar interests, as the
case may be. Such payment obligation will include any such costs, expenses or
liabilities of the Issuer that are required by applicable law to be satisfied
in connection with a termination of such Issuer.
 
GOVERNING LAW
 
  The Indenture and the Junior Subordinated Debentures will be governed by and
construed in accordance with the laws of the State of Illinois.
 
INFORMATION CONCERNING THE DEBENTURE TRUSTEE
 
  The Debenture Trustee shall have and be subject to all the duties and
responsibilities specified with respect to an indenture trustee under the
Trust Indenture Act. Subject to such provisions, the Debenture Trustee is
under no obligation to exercise any of the powers vested in it by the
Indenture at the request of any holder of Junior Subordinated Debentures,
unless offered reasonable indemnity by such holder against the costs, expenses
and liabilities which might be incurred thereby. The Debenture Trustee is not
required to expend or risk its own funds or otherwise incur personal financial
liability in the performance of its duties if the Debenture Trustee reasonably
believes that repayment or adequate indemnity is not reasonably assured to it.
 
CORRESPONDING JUNIOR SUBORDINATED DEBENTURES
 
  The Corresponding Junior Subordinated Debentures may be issued in one or
more series of Junior Subordinated Debentures under the Indenture with terms
corresponding to the terms of a series of Related Preferred Securities. In
that event, concurrently with the issuance of each Issuer's Preferred
Securities, such Issuer will invest the proceeds thereof and the consideration
paid by the Corporation for the Common Securities of such Issuer in such
series of Corresponding Junior Subordinated Debentures issued by the
Corporation to such Issuer. Each series of Corresponding Junior Subordinated
Debentures will be in the principal amount equal to the aggregate stated
Liquidation Amount of the Related Preferred Securities and the Common
Securities of such Issuer and will rank pari passu with all other series of
Junior Subordinated Debentures. Holders of the Related Preferred Securities
for a series of Corresponding Junior Subordinated Debentures will have the
rights in connection with modifications to the Indenture or upon occurrence of
a Debenture Event of Default, as described under "--Modification of Indenture"
and "--Debenture Events of Default," unless provided otherwise in the
Prospectus Supplement for such Related Preferred Securities.
 
                                      20
<PAGE>
 
  Unless otherwise specified in the applicable Prospectus Supplement, if a Tax
Event in respect of an Issuer shall occur and be continuing, the Corporation
may, at its option and subject to receipt of the prior approval of the Federal
Reserve, if then required under applicable Federal Reserve capital guidelines
or policies, redeem the Corresponding Junior Subordinated Debentures at any
time within 90 days of the occurrence of such Tax Event, in whole but not in
part, subject to the provisions of the Indenture and whether or not such
Corresponding Junior Subordinated Debentures are then otherwise redeemable at
the option of the Corporation. Unless otherwise provided in the applicable
Prospectus Supplement, the redemption price for any Corresponding Junior
Subordinated Debentures shall be equal to 100% of the principal amount of such
Corresponding Junior Subordinated Debentures then outstanding plus accrued and
unpaid interest to the date fixed for redemption. For so long as the
applicable Issuer is the holder of all the outstanding Corresponding Junior
Subordinated Debentures of such Issuer, the proceeds of any such redemption
will be used by the Issuer to redeem the corresponding Trust Securities in
accordance with their terms. The Corporation may not redeem a series of
Corresponding Junior Subordinated Debentures in part unless all accrued and
unpaid interest has been paid in full on all outstanding Corresponding Junior
Subordinated Debentures of such series for all interest periods terminating on
or prior to the Redemption Date.
 
  The Corporation will covenant in the Indenture, as to each series of
Corresponding Junior Subordinated Debentures, that if and so long as (i) the
Issuer of the related series of Trust Securities is the holder of all such
Corresponding Junior Subordinated Debentures, (ii) a Tax Event in respect of
such Issuer has occurred and is continuing and (iii) the Corporation has
elected, and has not revoked such election, to pay Additional Sums (as defined
under "Description of Preferred Securities--Redemption or Exchange") in
respect of such Trust Securities, the Corporation will pay to such Issuer such
Additional Sums. The Corporation will also covenant, as to each series of
Corresponding Junior Subordinated Debentures, (i) to maintain directly or
indirectly 100% ownership of the Common Securities of the Issuer to which such
Corresponding Junior Subordinated Debentures have been issued, provided that
certain successors which are permitted pursuant to the Indenture may succeed
to the Corporation's ownership of the Common Securities, (ii) not to
voluntarily terminate, wind-up or liquidate any Issuer, except (a) in
connection with a distribution of Corresponding Junior Subordinated Debentures
to the holders of the Preferred Securities in exchange therefor upon
liquidation of such Issuer or (b) in connection with certain mergers,
consolidations or amalgamations permitted by the related Trust Agreement, in
either such case, if so specified in the applicable Prospectus Supplement,
subject to receipt of the prior approval of the Federal Reserve, if then
required under applicable Federal Reserve capital guidelines or policies, and
(iii) to use its reasonable efforts, consistent with the terms and provisions
of the related Trust Agreement, to cause such Issuer to remain classified for
United States federal income tax purposes as a grantor trust or as other than
an association taxable as a corporation.
 
                                      21
<PAGE>
 
                      DESCRIPTION OF PREFERRED SECURITIES
 
  Pursuant to the terms of the Trust Agreement for each Issuer, the Issuer
Trustees on behalf of such Issuer will issue the Preferred Securities and the
Common Securities. The Preferred Securities of a particular Issuer will
represent preferred beneficial interests in the Issuer and the holders thereof
will be entitled to a preference in certain circumstances with respect to
Distributions and amounts payable on redemption or liquidation over the Common
Securities of such Issuer, as well as other benefits as described in the
corresponding Trust Agreement. This summary of certain provisions of the
Preferred Securities and each Trust Agreement, which summarizes the material
terms thereof, does not purport to be complete and is subject to, and is
qualified in its entirety by reference to, all the provisions of each Trust
Agreement, including the definitions therein of certain terms, and the Trust
Indenture Act, to which reference is hereby made. Wherever particular defined
terms of a Trust Agreement (as amended or supplemented from time to time) are
referred to herein or in a Prospectus Supplement, such defined terms are
incorporated herein or therein by reference. The form of the Trust Agreement
has been filed as an exhibit to the Registration Statement of which this
Prospectus forms a part. Each of the Issuers is a legally separate entity and
the assets of one are not available to satisfy the obligations of any of the
others.
 
GENERAL
 
  The Preferred Securities of an Issuer will rank pari passu, and payments
will be made thereon pro rata, with the Common Securities of that Issuer
except as described under "--Subordination of Common Securities." Legal title
to the Corresponding Junior Subordinated Debentures will be held by the
Property Trustee in trust for the benefit of the holders of the related
Preferred Securities and Common Securities. Each Guarantee Agreement executed
by the Corporation for the benefit of the holders of an Issuer's Trust
Securities (the "Guarantee" for such Preferred Securities) will be a guarantee
on a subordinated basis with respect to the related Trust Securities but will
not guarantee payment of Distributions or amounts payable on redemption or
liquidation of such Preferred Securities when the related Issuer does not have
funds on hand available to make such payments. See "Description of
Guarantees."
 
DISTRIBUTIONS
 
  Distributions on the Preferred Securities will be cumulative, will
accumulate from the date of original issuance and will be payable on such
dates as specified in the applicable Prospectus Supplement. In the event that
any date on which Distributions are payable on the Preferred Securities is not
a Business Day (as defined below), payment of the Distribution payable on such
date will be made on the next succeeding day that is a Business Day (and
without any interest or other payment in respect to any such delay) except
that, if such Business Day is in the next succeeding calendar year, payment of
such Distribution shall be made on the immediately preceding Business Day, in
either case with the same force and effect as if made on such date (each date
on which Distributions are payable in accordance with the foregoing, a
"Distribution Date"). A "Business Day" shall mean any day other than a
Saturday or a Sunday, or a day on which banking institutions in The City of
New York or the City of Chicago, Illinois, are authorized or required by law
or executive order to remain closed or a day on which the corporate trust
office of the Property Trustee or the Debenture Trustee is closed for
business.
 
  Each Issuer's Preferred Securities represent preferred beneficial interests
in the applicable Issuer, and the Distributions on each Preferred Security
will be payable at a rate specified in the applicable Prospectus Supplement
for such Preferred Securities. The amount of Distributions payable for any
period will be computed on the basis of a 360-day year of twelve 30-day months
unless otherwise specified in the applicable Prospectus Supplement.
Distributions to which holders of Preferred Securities are entitled will
accumulate additional Distributions at the rate per annum if and as specified
in the applicable Prospectus Supplement. The term "Distributions" as used
herein includes any such additional Distributions unless otherwise stated.
 
  If provided in the applicable Prospectus Supplement, the Corporation has the
right under the Indenture, pursuant to which it will issue the Corresponding
Junior Subordinated Debentures, to defer the payment of interest at any time
or from time to time on any series of the Corresponding Junior Subordinated
Debentures for
 
                                      22
<PAGE>
 
up to such number of consecutive interest payment periods which will be
specified in such Prospectus Supplement relating to such series (each, an
"Extension Period"), provided that no Extension Period may extend beyond the
Stated Maturity of the Corresponding Junior Subordinated Debentures. As a
consequence of any such deferral, Distributions on the Related Preferred
Securities would be deferred (but would continue to accumulate additional
Distributions thereon at the rate per annum set forth in the Prospectus
Supplement for such Preferred Securities) by the Issuer of such Preferred
Securities during any such Extension Period. During any such Extension Period,
the Corporation may not (i) declare or pay any dividends or distributions on,
or redeem, purchase or acquire, or make a liquidation payment with respect to,
any of the Corporation's capital stock or (ii) make any payment of principal
of or interest or premium, if any, on or repay, repurchase or redeem any debt
securities of the Corporation that rank pari passu in all respects with or
junior in interest to the Corresponding Junior Subordinated Debentures (other
than (a) repurchases, redemptions or other acquisitions of shares of capital
stock of the Corporation in connection with any employment contract, benefit
plan or other similar arrangement with or for the benefit of one or more
employees, officers, directors or consultants, in connection with a dividend
reinvestment or stockholder stock purchase plan or in connection with the
issuance of capital stock of the Corporation (or securities convertible into
or exercisable for such capital stock) as consideration in an acquisition
transaction entered into prior to the applicable Extension Period, (b) as a
result of any exchange or conversion of any class or series of the
Corporation's capital stock (or any capital stock of a subsidiary of the
Corporation) for any class or series of the Corporation's capital stock or of
any class or series of the Corporation's indebtedness for any class or series
of the Corporation's capital stock, (c) the purchase of fractional interests
in shares of the Corporation's capital stock pursuant to the conversion or
exchange provisions of such capital stock or the security being converted or
exchanged, (d) any declaration of a dividend in connection with any
stockholder rights plan, or the issuance of rights, stock or other property
under any stockholder rights plan, or the redemption or repurchase of rights
pursuant thereto, or (e) any dividend in the form of stock, warrants, options
or other rights where the dividend stock or the stock issuable upon exercise
of such warrants, options or other rights is the same stock as that on which
the dividend is being paid or ranks pari passu with or junior to such stock).
 
  The revenue of each Issuer available for distribution to holders of its
Preferred Securities will be limited to payments under the Corresponding
Junior Subordinated Debentures in which the Issuer will invest the proceeds
from the issuance and sale of its Trust Securities. See "Description of Junior
Subordinated Debentures--Corresponding Junior Subordinated Debentures." If the
Corporation does not make interest payments on such Corresponding Junior
Subordinated Debentures, the Property Trustee will not have funds available to
pay Distributions on the Related Preferred Securities. The payment of
Distributions (if and to the extent the Issuer has funds legally available for
the payment of such Distributions and cash sufficient to make such payments)
is guaranteed by the Corporation on a limited basis as set forth herein under
"Description of Guarantees."
 
  Distributions on the Preferred Securities will be payable to the holders
thereof as they appear on the register of such Issuer on the relevant record
dates, which, as long as the Preferred Securities remain in book-entry form,
will be one Business Day prior to the relevant Distribution Date. Subject to
any applicable laws and regulations and the provisions of the applicable Trust
Agreement, each such payment will be made as described under "Book-Entry
Issuance." In the event any Preferred Securities are not in book-entry form,
the relevant record date for such Preferred Securities shall be the date at
least 15 days prior to the relevant Distribution Date, as specified in the
applicable Prospectus Supplement.
 
REDEMPTION OR EXCHANGE
 
  MANDATORY REDEMPTION. Upon the repayment or redemption, in whole or in part,
of any Corresponding Junior Subordinated Debentures, whether at maturity or
upon earlier redemption as provided in the Indenture, the proceeds from such
repayment or redemption shall be applied by the Property Trustee to redeem a
Like Amount (as defined below) of the Trust Securities, upon not less than 30
nor more than 60 days notice, at a redemption price (the "Redemption Price")
equal to the aggregate Liquidation Amount of such Trust Securities plus
accumulated but unpaid Distributions thereon to the date of redemption (the
"Redemption Date") and the related amount of the premium, if any, paid by the
Corporation upon the concurrent redemption of such
 
                                      23
<PAGE>
 
Corresponding Junior Subordinated Debentures. See "Description of Junior
Subordinated Debentures--Redemption." If less than all of any series of
Corresponding Junior Subordinated Debentures are to be repaid or redeemed on a
Redemption Date, then the proceeds from such repayment or redemption shall be
allocated to the redemption pro rata of the Related Preferred Securities and
the Common Securities. The amount of premium, if any, paid by the Corporation
upon the redemption of all or any part of any series of any Corresponding
Junior Subordinated Debentures to be repaid or redeemed on a Redemption Date
shall be allocated to the redemption pro rata of the Related Preferred
Securities and the Common Securities.
 
  The Corporation will have the right to redeem any series of Corresponding
Junior Subordinated Debentures (i) on or after such date as may be specified
in the applicable Prospectus Supplement, in whole at any time or in part from
time to time, (ii) at any time, in whole (but not in part), upon the
occurrence of a Tax Event or Capital Treatment Event or (iii) as may be
otherwise specified in the applicable Prospectus Supplement, in each case
subject to receipt of the prior approval by the Federal Reserve, if then
required under applicable Federal Reserve capital guidelines or policies.
 
  Tax Event or Capital Treatment Event Redemption. If a Tax Event or Capital
Treatment Event in respect of a series of Preferred Securities and Common
Securities shall occur and be continuing, the Corporation shall have the right
to redeem the Corresponding Junior Subordinated Debentures in whole (but not
in part) and thereby cause a mandatory redemption of such Preferred Securities
and Common Securities in whole (but not in part) at the Redemption Price
within 90 days following the occurrence of such Tax Event or Capital Treatment
Event. In the event a Tax Event or Capital Treatment Event in respect of a
series of Preferred Securities and Common Securities has occurred and is
continuing and the Corporation does not elect to redeem the Corresponding
Junior Subordinated Debentures and thereby cause a mandatory redemption of
such Preferred Securities or to liquidate the related Issuer and cause the
Corresponding Junior Subordinated Debentures to be distributed to holders of
such Preferred Securities and Common Securities in exchange therefor upon
liquidation of the Issuer as described above, such Preferred Securities will
remain outstanding and Additional Sums (as defined below) may be payable on
the Corresponding Junior Subordinated Debentures.
 
  "Additional Sums" means the additional amounts as may be necessary in order
that the amount of Distributions then due and payable by an Issuer on the
outstanding Preferred Securities and Common Securities of the Issuer shall not
be reduced as a result of any additional taxes, duties and other governmental
charges to which such Issuer has become subject as a result of a Tax Event.
 
  "Capital Treatment Event" means the reasonable determination by the
Corporation that, as a result of the occurrence of any amendment to, or change
(including any announced prospective change) in, the laws (or any rules or
regulations thereunder) of the United States or any political subdivision
thereof or therein, or as a result of any official or administrative
pronouncement or action or judicial decision interpreting or applying such
laws, rules or regulations, which amendment or change is effective or such
pronouncement, action or decision is announced on or after the date of
issuance of the Preferred Securities of an Issuer, there is more than an
insubstantial risk that the Corporation will not be entitled to treat an
amount equal to the aggregate Liquidation Amount of such Preferred Securities
as Tier 1 capital (or the then equivalent thereof) for purposes of the capital
adequacy guidelines of the Federal Reserve, as then in effect and applicable
to the Corporation.
 
  "Like Amount" means (i) with respect to a redemption of any series of Trust
Securities, Trust Securities of such series having a Liquidation Amount (as
defined below) equal to the principal amount of Corresponding Junior
Subordinated Debentures to be contemporaneously redeemed in accordance with
the Indenture, the proceeds of which will be used to pay the Redemption Price
of such Trust Securities, and (ii) with respect to a distribution of
Corresponding Junior Subordinated Debentures to holders of any series of Trust
Securities in connection with a dissolution or liquidation of the related
Issuer, Corresponding Junior Subordinated Debentures having a principal amount
equal to the Liquidation Amount of the Trust Securities in respect of which
such distribution is made.
 
  "Liquidation Amount" means the stated amount per Trust Security of $25 (or
such other stated amount as is set forth in the applicable Prospectus
Supplement).
 
                                      24
<PAGE>
 
  "Tax Event" with respect to an Issuer means the receipt by the Issuer of a
series of Preferred Securities of an opinion of counsel experienced in such
matters to the effect that, as a result of any amendment to, or change
(including any announced prospective change) in, the laws (or any regulations
thereunder) of the United States or any political subdivision or taxing
authority thereof or therein, or as a result of any official administrative
pronouncement or judicial decision interpreting or applying such laws or
regulations, which amendment or change is effective or which pronouncement or
decision is announced on or after the date of issuance of such Preferred
Securities under the Trust Agreement, there is more than an insubstantial risk
that (i) such Issuer is, or will be within 90 days of the date of such
opinion, subject to United States federal income tax with respect to income
received or accrued on the corresponding series of Corresponding Junior
Subordinated Debentures, (ii) interest payable by the Corporation on such
series of Corresponding Junior Subordinated Debentures is not, or within 90
days of the date of such opinion, will not be, deductible by the Corporation,
in whole or in part, for United States federal income tax purposes, or (iii)
such Issuer is, or will be within 90 days of the date of such opinion, subject
to more than a de minimis amount of other taxes, duties or other governmental
charges.
 
  Possible Tax Law Changes. On March 19, 1996, the Revenue Reconciliation
Bill, the revenue portion of President Clinton's budget proposal, was
introduced in the 104th Congress. If enacted, the Revenue Reconciliation Bill
would have generally denied interest deductions for interest on an instrument
issued by a corporation that has a maximum term of more than 20 years and that
is not shown as indebtedness on the separate balance sheet of the issuer or,
where the instrument is issued to a related party (other than a corporation),
where the holder or some other related party issues a related instrument that
is not shown as indebtedness on the issuer's consolidated balance sheet. For
purposes of determining the weighted average maturity or the term of an
instrument, any right to extend would be treated as exercised. The above-
described provisions of the Revenue Reconciliation Bill were proposed to be
effective generally for instruments issued on or after December 7, 1995. If
the proposed provision had applied to the Preferred Securities of any Series,
the Corporation would have been unable to deduct interest on the Preferred
Securities of such Series. However, on March 29, 1996, the Chairmen of the
Senate Finance and House Ways and Means Committees issued a joint statement to
the effect that it was their intention that the effective date of the
President's legislative proposals, if adopted, will be no earlier than the
date of appropriate Congressional action. The 104th Congress adjourned without
enacting the above-described provisions of the Revenue Reconciliation Bill,
and under current law, the Corporation will be able to deduct interest on the
Preferred Securities.
 
  Although the above-described provisions of the Revenue Reconciliation Bill
were not enacted in 1996, there can be no assurance that current or future
legislative proposals or final legislation will not affect the ability of the
Corporation to deduct interest on the Preferred Securities. Such a change
could give rise to a Tax Event, which may permit the Corporation to cause a
redemption of the Preferred Securities, as described more fully herein.
   
  Distribution of Corresponding Junior Subordinated Debentures. Subject to the
Corporation having received the prior approval of the Federal Reserve to do
so, if such approval is then required under applicable Federal Reserve capital
guidelines or policies, the Corporation has the right at any time to terminate
any Issuer and, after satisfaction of the liabilities to creditors of such
Issuer as provided by applicable law, cause the Corresponding Junior
Subordinated Debentures in respect of the Preferred Securities and Common
Securities issued by such Issuer to be distributed to the holders of such
Preferred Securities and Common Securities in liquidation of the Issuer.     
 
  After the liquidation date fixed for any distribution of Corresponding
Junior Subordinated Debentures for any series of Preferred Securities (i) such
series of Preferred Securities will no longer be deemed to be outstanding,
(ii) the Depositary or its nominee, as the record holder of such series of
Preferred Securities, will receive a registered global certificate or
certificates representing the Corresponding Junior Subordinated Debentures to
be delivered upon such distribution and (iii) any certificates representing
such series of Preferred Securities not held by DTC or its nominee will be
deemed to represent the Corresponding Junior Subordinated Debentures having a
principal amount equal to the stated Liquidation Amount of such series of
Preferred Securities, and bearing accrued and unpaid interest in an amount
equal to the accrued and unpaid Distributions
 
                                      25
<PAGE>
 
on such series of Preferred Securities until such certificates are presented
to the Administrative Trustees or their agent for transfer or reissuance.
 
  There can be no assurance as to the market prices for the Preferred
Securities or the Corresponding Junior Subordinated Debentures that may be
distributed in exchange for Preferred Securities if a dissolution and
liquidation of an Issuer were to occur. Accordingly, the Preferred Securities
that an investor may purchase, or the Corresponding Junior Subordinated
Debentures that the investor may receive on dissolution and liquidation of an
Issuer, may trade at a discount to the price that the investor paid to
purchase the Preferred Securities offered hereby.
 
REDEMPTION PROCEDURES
 
  Preferred Securities redeemed on each Redemption Date shall be redeemed at
the Redemption Price with the applicable proceeds from the contemporaneous
redemption of the Corresponding Junior Subordinated Debentures. Redemptions of
the Preferred Securities shall be made and the Redemption Price shall be
payable on each Redemption Date only to the extent that the related Issuer has
funds on hand available for the payment of such Redemption Price. See also "--
Subordination of Common Securities."
 
  If the Property Trustee gives a notice of redemption in respect of the
Preferred Securities, then, by 12:00 noon, New York City time, on the
Redemption Date, to the extent funds are available, the Property Trustee will
deposit irrevocably with DTC funds sufficient to pay the applicable Redemption
Price and will give DTC irrevocable instructions and authority to pay the
Redemption Price to the holders of such Preferred Securities. See "Book-Entry
Issuance." If such Preferred Securities are no longer in book-entry form, the
Property Trustee, to the extent funds are available, will irrevocably deposit
with the paying agent for such Preferred Securities funds sufficient to pay
the applicable Redemption Price and will give such paying agent irrevocable
instructions and authority to pay the Redemption Price to the holders thereof
upon surrender of their certificates evidencing such Preferred Securities.
Notwithstanding the foregoing, Distributions payable on or prior to the
Redemption Date for any Preferred Securities called for redemption shall be
payable to the holders of such Preferred Securities on the relevant record
dates for the related Distribution Dates. If notice of redemption shall have
been given and funds deposited as required, then upon the date of such
deposit, all rights of the holders of such Preferred Securities so called for
redemption will cease, except the right of the holders of such Preferred
Securities to receive the Redemption Price, including any Distribution payable
in respect of the Preferred Securities on or prior to the Redemption Date, but
without interest on such Redemption Price, and such Preferred Securities will
cease to be outstanding. In the event that any date fixed for redemption of
Preferred Securities is not a Business Day, then payment of the Redemption
Price payable on such date will be made on the next succeeding day which is a
Business Day (and without any interest or other payment in respect of any such
delay), except that, if such Business Day falls in the next calendar year,
such payment will be made on the immediately preceding Business Day, in each
case, with the same force and effect as if made on such date. In the event
that payment of the Redemption Price in respect of Preferred Securities called
for redemption is improperly withheld or refused and not paid either by the
Issuer or by the Corporation pursuant to the Guarantee as described under
"Description of Guarantees," Distributions on such Preferred Securities will
continue to accrue at the then applicable rate from the Redemption Date
originally established by the Issuer for such Preferred Securities to the date
such Redemption Price is actually paid, in which case the actual payment date
will be the date fixed for redemption for purposes of calculating the
Redemption Price.
 
  Subject to applicable law (including, without limitation, United States
federal securities law), the Corporation or its subsidiaries may at any time
and from time to time purchase outstanding Preferred Securities by tender, in
the open market or by private agreement.
 
  Payment of the Redemption Price on the Preferred Securities and any
distribution of Corresponding Junior Subordinated Debentures to holders of
Preferred Securities shall be made to the applicable recordholders thereof as
they appear on the register for such Preferred Securities on the relevant
record date, which shall be one Business Day prior to the relevant Redemption
Date or liquidation date, as applicable; provided, however, that in
 
                                      26
<PAGE>
 
the event that any Preferred Securities are not in book-entry form, the
relevant record date for such Preferred Securities shall be a date at least 15
days prior to the Redemption Date or liquidation date, as applicable, as
specified in the applicable Prospectus Supplement.
 
  If less than all of the Preferred Securities and Common Securities issued by
an Issuer are to be redeemed on a Redemption Date, then the aggregate
Liquidation Amount of such Preferred Securities and Common Securities to be
redeemed shall be allocated pro rata to the Preferred Securities and the
Common Securities based upon the relative Liquidation Amounts of such classes.
The particular Preferred Securities to be redeemed shall be selected on a pro
rata basis not more than 60 days prior to the Redemption Date by the Property
Trustee from the outstanding Preferred Securities not previously called for
redemption, by such method as the Property Trustee shall deem fair and
appropriate and which may provide for the selection for redemption of portions
(equal to $25 or an integral multiple of $25 in excess thereof, unless a
different amount is specified in the applicable Prospectus Supplement) of the
Liquidation Amount of Preferred Securities of a denomination larger than $25
(or such other denomination as is specified in the applicable Prospectus
Supplement). The Property Trustee shall promptly notify the Securities
Registrar in writing of the Preferred Securities selected for redemption and,
in the case of any Preferred Securities selected for partial redemption, the
Liquidation Amount thereof to be redeemed. For all purposes of each Trust
Agreement, unless the context otherwise requires, all provisions relating to
the redemption of Preferred Securities shall relate, in the case of any
Preferred Securities redeemed or to be redeemed only in part, to the portion
of the aggregate Liquidation Amount of Preferred Securities which has been or
is to be redeemed.
 
  Notice of any redemption will be mailed at least 30 days but not more than
60 days before the Redemption Date to each holder of Trust Securities to be
redeemed at its registered address. Unless the Corporation defaults in payment
of the Redemption Price on the Corresponding Junior Subordinated Debentures,
on and after the Redemption Date interest will cease to accrue on such Junior
Subordinated Debentures or portions thereof (and Distributions will cease to
accrue on the Related Preferred Securities or portions thereof) called for
redemption.
 
SUBORDINATION OF COMMON SECURITIES
 
  Payment of Distributions on, and the Redemption Price of, each Issuer's
Preferred Securities and Common Securities, as applicable, shall be made pro
rata based on the Liquidation Amount of such Preferred Securities and Common
Securities; provided, however, that if on any Distribution Date, Redemption
Date or Liquidation Date a Debenture Event of Default shall have occurred and
be continuing, no payment of any Distribution on, or Redemption Price of, or
Liquidation Distribution in respect of, any of the Issuer's Common Securities,
and no other payment on account of the redemption, liquidation or other
acquisition of such Common Securities, shall be made unless payment in full in
cash of all accumulated and unpaid Distributions on all of the Issuer's
outstanding Preferred Securities for all Distribution periods terminating on
or prior thereto, or in the case of payment of the Redemption Price the full
amount of such Redemption Price on all of the Issuer's outstanding Preferred
Securities then called for redemption, or in the case of payment of the
Liquidation Distribution the full amount of such Liquidation Distribution on
all Outstanding Preferred Securities, shall have been made or provided for,
and all funds available to the Property Trustee shall first be applied to the
payment in full in cash of all Distributions on, or Redemption Price of, the
Issuer's Preferred Securities then due and payable.
 
  In the case of any Event of Default under the applicable Trust Agreement
resulting from a Debenture Event of Default, the Corporation as holder of such
Issuer's Common Securities will be deemed to have waived any right to act with
respect to any such Event of Default under the applicable Trust Agreement
until the effect of all such Events of Default with respect to such Preferred
Securities have been cured, waived or otherwise eliminated. See "--Events of
Default; Notice." Until any such Events of Default under the applicable Trust
Agreement with respect to the Preferred Securities have been so cured, waived
or otherwise eliminated, the Property Trustee shall act solely on behalf of
the holders of such Preferred Securities and not on behalf of the Corporation
as holder of the Issuer's Common Securities, and only the holders of such
Preferred Securities will have the right to direct the Property Trustee to act
on their behalf.
 
                                      27
<PAGE>
 
LIQUIDATION DISTRIBUTION UPON TERMINATION
   
  Pursuant to each Trust Agreement, each Issuer shall automatically terminate
upon expiration of its term and shall terminate on the first to occur of: (i)
certain events of bankruptcy, dissolution or liquidation of the Corporation;
(ii) the written direction to the Property Trustee from the Corporation at any
time to terminate an Issuer and to distribute a Like Amount of the
Corresponding Junior Subordinated Debentures in exchange for its Trust
Securities (subject to the Corporation having received the prior approval of
the Federal Reserve, if then required under applicable Federal Reserve capital
guidelines or policies); (iii) redemption of all of the Issuer's Preferred
Securities as described under "--Redemption or Exchange--Mandatory
Redemption"; and (iv) the entry of an order for the dissolution of the Issuer
by a court of competent jurisdiction.     
 
  If an early termination occurs as described in clause (i), (ii) or (iv)
above, the Issuer shall be liquidated by the Issuer Trustees as expeditiously
as the Issuer Trustees determine to be possible by distributing, after
satisfaction of liabilities to creditors of such Issuer as provided by
applicable law, to the holders of such Trust Securities in exchange therefor a
Like Amount of the Corresponding Junior Subordinated Debentures, unless such
distribution is determined by the Property Trustee not to be practical, in
which event such holders will be entitled to receive out of the assets of the
Issuer available for distribution to holders, after satisfaction of
liabilities to creditors of such Issuer as provided by applicable law, an
amount equal to, in the case of holders of Preferred Securities, the aggregate
of the Liquidation Amount plus accrued and unpaid Distributions thereon to the
date of payment (such amount being the "Liquidation Distribution"). If such
Liquidation Distribution can be paid only in part because such Issuer has
insufficient assets available to pay in full the aggregate Liquidation
Distribution, then the amounts payable directly by such Issuer on its
Preferred Securities shall be paid on a pro rata basis. The holder(s) of such
Issuer's Common Securities will be entitled to receive distributions upon any
such liquidation pro rata with the holders of its Preferred Securities, except
that if a Debenture Event of Default has occurred and is continuing, the
Preferred Securities shall have a priority over the Common Securities.
 
EVENTS OF DEFAULT; NOTICE
 
  Any one of the following events constitutes an "Event of Default" under each
Trust Agreement with respect to the Preferred Securities issued thereunder
(whatever the reason for such Event of Default and whether it shall be
voluntary or involuntary or be effected by operation of law or pursuant to any
judgment, decree or order of any court or any order, rule or regulation of any
administrative or governmental body):
 
    (i) the occurrence of a Debenture Event of Default under the Indenture
  (see "Description of Junior Subordinated Debentures--Debenture Events of
  Default"); or
     
    (ii) default by the Issuer in the payment of any Distribution when it
  becomes due and payable, and continuation of such default for a period of
  30 days; or     
     
    (iii) default by the Issuer in the payment of any Redemption Price of any
  Trust Security when it becomes due and payable; or     
 
    (iv) default in the performance, or breach, in any material respect, of
  any covenant or warranty of the Issuer Trustees in such Trust Agreement
  (other than a covenant or warranty a default in the performance of which or
  the breach of which is dealt with in clause (ii) or (iii) above), and
  continuation of such default or breach for a period of 60 days after there
  has been given, by registered or certified mail, to the defaulting Issuer
  Trustee or Trustees by the holders of at least 25% in aggregate Liquidation
  Amount of the outstanding Preferred Securities of the applicable Issuer, a
  written notice specifying such default or breach and requiring it to be
  remedied and stating that such notice is a "Notice of Default" under such
  Trust Agreement; or
 
    (v) the occurrence of certain events of bankruptcy or insolvency with
  respect to the Property Trustee and the failure by the Corporation to
  appoint a successor Property Trustee within 90 days thereof.
 
  Within five Business Days after the occurrence of any Event of Default
actually known to the Property Trustee, the Property Trustee shall transmit
notice of such Event of Default to the holders of such Issuer's Preferred
Securities, the Administrative Trustees and the Corporation, as Depositor,
unless such Event of Default
 
                                      28
<PAGE>
 
shall have been cured or waived. The Corporation, as Depositor, and the
Administrative Trustees are required to file annually with the Property
Trustee a certificate as to whether or not they are in compliance with all the
conditions and covenants applicable to them under each Trust Agreement.
 
  If a Debenture Event of Default has occurred and is continuing, the
Preferred Securities shall have a preference over the Common Securities as
described above. See "--Liquidation Distribution Upon Termination." The
existence of an Event of Default does not entitle the holders of Preferred
Securities to accelerate the maturity thereof.
 
REMOVAL OF ISSUER TRUSTEES
 
  Unless a Debenture Event of Default shall have occurred and be continuing,
any Issuer Trustee may be removed at any time by the holder of the Common
Securities. If a Debenture Event of Default has occurred and is continuing,
the Property Trustee and the Delaware Trustee may be removed at such time by
the holders of a majority in Liquidation Amount of the outstanding Preferred
Securities. In no event will the holders of the Preferred Securities have the
right to vote to appoint, remove or replace the Administrative Trustees, which
voting rights are vested exclusively in the Corporation as the holder of the
Common Securities. No resignation or removal of an Issuer Trustee and no
appointment of a successor trustee shall be effective until the acceptance of
appointment by the successor trustee in accordance with the provisions of the
applicable Trust Agreement.
 
CO-TRUSTEES AND SEPARATE PROPERTY TRUSTEE
 
  Unless an Event of Default shall have occurred and be continuing, at any
time or from time to time, for the purpose of meeting the legal requirements
of the Trust Indenture Act or of any jurisdiction in which any part of the
Trust Property may at the time be located, the Corporation, as the holder of
the Common Securities, and the Administrative Trustees shall have power to
appoint one or more persons either to act as a co-trustee, jointly with the
Property Trustee, of all or any part of such Trust Property, or to act as
separate trustee of any such property, in either case with such powers as may
be provided in the instrument of appointment, and to vest in such person or
persons in such capacity any property, title, right or power deemed necessary
or desirable, subject to the provisions of the applicable Trust Agreement. In
case a Debenture Event of Default has occurred and is continuing, the Property
Trustee alone shall have power to make such appointment.
 
MERGER OR CONSOLIDATION OF ISSUER TRUSTEES
   
  Any entity into which the Property Trustee, the Delaware Trustee or any
Administrative Trustee that is not a natural person may be merged or converted
or with which it may be consolidated, or any entity resulting from any merger,
conversion or consolidation to which such Trustee shall be a party, or any
entity succeeding to all or substantially all the corporate trust business of
such Trustee, shall be the successor of such Trustee under each Trust
Agreement, provided such entity shall be otherwise qualified and eligible.
    
MERGERS, CONSOLIDATIONS, AMALGAMATIONS OR REPLACEMENTS OF THE ISSUERS
   
  An Issuer may not merge, consolidate or amalgamate with or into, or be
replaced by, or convey, transfer or lease its properties and assets
substantially as an entirety to any entity, except as described below or as
otherwise provided in such Issuer's Trust Agreement. An Issuer may, at the
request of the Corporation, with the consent of the Administrative Trustees
and without the consent of the holders of the Preferred Securities, merge,
consolidate or amalgamate with or into, or be replaced by or convey, transfer
or lease its properties and assets substantially as an entirety to a trust
organized as such under the laws of any State; provided, that (i) such
successor entity either (a) expressly assumes all of the obligations of such
Issuer with respect to the Preferred Securities or (b) substitutes for the
Preferred Securities other securities having substantially the same terms as
the Preferred Securities (the "Successor Securities") so long as the Successor
Securities rank the same as the Preferred Securities in priority with respect
to distributions and payments upon liquidation, redemption and otherwise, (ii)
the Corporation expressly appoints a trustee of such successor entity
possessing the same powers and duties as     
 
                                      29
<PAGE>
 
   
the Property Trustee as the holder of the Corresponding Junior Subordinated
Debentures, (iii) the Successor Securities are listed, or any Successor
Securities will be listed upon notification of issuance, on any national
securities exchange, automated quotation system or other organization on which
the Preferred Securities are then listed, if any, (iv) such merger,
consolidation, amalgamation, replacement, conveyance, transfer or lease does
not cause the Preferred Securities to be downgraded by any nationally
recognized statistical rating organization which assigns ratings to the
Preferred Securities, (v) such merger, consolidation, amalgamation,
replacement, conveyance, transfer or lease does not adversely affect the
rights, preferences and privileges of the holders of the Preferred Securities
(including any Successor Securities) in any material respect, (vi) such
successor entity has a purpose substantially identical to that of the Issuer,
(vii) prior to such merger, consolidation, amalgamation, replacement,
conveyance, transfer or lease, the Corporation has received an opinion from
independent counsel to the Issuer experienced in such matters to the effect
that (a) such merger, consolidation, amalgamation, replacement, conveyance,
transfer or lease does not adversely affect the rights, preferences and
privileges of the holders of the Preferred Securities (including any Successor
Securities) in any material respect, and (b) following such merger,
consolidation, amalgamation, replacement, conveyance, transfer or lease,
neither the Issuer nor such successor entity will be required to register as
an investment company under the Investment Company Act of 1940, as amended
(the "Investment Company Act"), and (viii) the Corporation or any permitted
successor or assignee owns all of the common securities of such successor
entity and guarantees the obligations of such successor entity under the
Successor Securities at least to the extent provided by the Guarantee.
Notwithstanding the foregoing, an Issuer shall not, except with the consent of
holders of 100% in Liquidation Amount of the Preferred Securities, merge,
consolidate or amalgamate with or into, or be replaced by or convey, transfer
or lease its properties and assets substantially as an entirety to any other
entity or permit any other entity to merge, consolidate or amalgamate with or
into, or replace it if such consolidation, amalgamation, merger, replacement,
conveyance, transfer or lease would cause the Issuer or the successor entity
to be classified as an association taxable as a corporation or as other than a
grantor trust for United States federal income tax purposes.     
 
VOTING RIGHTS; AMENDMENT OF EACH TRUST AGREEMENT
 
  Except as provided below and under "Description of Guarantees--Amendments
and Assignment" and as otherwise required by law and the applicable Trust
Agreement, the holders of the Preferred Securities will have no voting rights.
   
  Each Trust Agreement may be amended from time to time by the holders of the
Common Securities, the Property Trustee and the Administrative Trustees,
without the consent of the holders of the Preferred Securities (i) to cure any
ambiguity, correct or supplement any provisions in such Trust Agreement that
may be inconsistent with any other provision, or to make any other provisions
with respect to matters or questions arising under such Trust Agreement, which
shall not be inconsistent with the other provisions of such Trust Agreement,
or (ii) to modify, eliminate or add to any provisions of such Trust Agreement
to such extent as shall be necessary to ensure that the Issuer will not be
taxable as a corporation or classified as other than a grantor trust for
United States federal income tax purposes at all times that any Trust
Securities are outstanding or to ensure that the Issuer will not be required
to register as an "investment company" under the Investment Company Act;
provided, however, that in the case of either clause (i) or clause (ii), such
action shall not adversely affect in any material respect the interests of any
holder of Preferred Securities, and any amendments of such Trust Agreement
shall become effective when notice thereof is given to the holders of Trust
Securities. Each Trust Agreement may be amended by the Issuer Trustees and the
holders of the Common Securities with (i) the consent of holders representing
not less than a majority (based upon Liquidation Amounts) of the outstanding
Trust Securities, and (ii) receipt by the Issuer Trustees of an opinion of
counsel to the effect that such amendment or the exercise of any power granted
to the Issuer Trustees in accordance with such amendment will not cause the
Issuer to be taxable as a corporation or affect the Issuer's status as a
grantor trust for United States federal income tax purposes or the Issuer's
exemption from status as an "investment company" under the Investment Company
Act, provided that without the consent of each holder of Trust Securities,
such Trust Agreement may not be amended to (i) change the amount or timing of
any Distribution on the Trust Securities or otherwise adversely affect the
amount of any Distribution required to be made in respect of the Trust
Securities as of a specified date or (ii) restrict the right of a holder of
Trust Securities to institute suit for the enforcement of any such payment on
or after such date.     
 
                                      30
<PAGE>
 
  So long as any Corresponding Junior Subordinated Debentures are held by the
Property Trustee, the Issuer Trustees shall not (i) direct the time, method
and place of conducting any proceeding for any remedy available to the
Debenture Trustee, or executing any trust or power conferred on the Property
Trustee with respect to such Corresponding Junior Subordinated Debentures,
(ii) waive any past default that is waivable under the Indenture, (iii)
exercise any right to rescind or annul a declaration that the principal of all
the Junior Subordinated Debentures shall be due and payable or (iv) consent to
any amendment, modification or termination of the Indenture or such
Corresponding Junior Subordinated Debentures, where such consent shall be
required, without, in each case, obtaining the prior approval of the holders
of a majority in aggregate Liquidation Amount of all outstanding Preferred
Securities; provided, however, that where a consent under the Indenture would
require the consent of each holder of Corresponding Junior Subordinated
Debentures affected thereby, no such consent shall be given by the Property
Trustee without the prior consent of each holder of the Related Preferred
Securities. The Issuer Trustees shall not revoke any action previously
authorized or approved by a vote of the holders of the Preferred Securities
except by subsequent vote of the holders of the Preferred Securities. The
Property Trustee shall notify each holder of Preferred Securities of any
notice of default with respect to the Corresponding Junior Subordinated
Debentures. In addition to obtaining the foregoing approvals of the holders of
the Preferred Securities, prior to taking any of the foregoing actions, the
Issuer Trustees shall obtain an opinion of counsel experienced in such matters
to the effect that the Issuer will not be classified as an association taxable
as a corporation for United States federal income tax purposes on account of
such action and such action would not cause the Issuer to be classified as
other than a grantor trust for United States federal income tax purposes.
 
  Any required approval of holders of Preferred Securities may be given at a
meeting of holders of Preferred Securities convened for such purpose or
pursuant to written consent. The Property Trustee will cause a notice of any
meeting at which holders of Preferred Securities are entitled to vote, or of
any matter upon which action by written consent of such holders is to be
taken, to be given to each holder of record of Preferred Securities in the
manner set forth in each Trust Agreement.
 
  No vote or consent of the holders of Preferred Securities will be required
for an Issuer to redeem and cancel its Preferred Securities in accordance with
the applicable Trust Agreement.
 
  Notwithstanding that holders of Preferred Securities are entitled to vote or
consent under any of the circumstances described above, any of the Preferred
Securities that are owned by the Corporation, the Issuer Trustees or any
affiliate of the Corporation or any Issuer Trustees, shall, for purposes of
such vote or consent, be treated as if they were not outstanding.
 
GLOBAL PREFERRED SECURITIES
 
  The Preferred Securities of a series may be issued in whole or in part in
the form of one or more Global Preferred Securities that will be deposited
with, or on behalf of, the Depositary identified in the Prospectus Supplement
relating to such series. Unless otherwise indicated in the applicable
Prospectus Supplement for such series, the Depositary will be DTC. Global
Preferred Securities may be issued only in fully registered form and in either
temporary or permanent form. Unless and until it is exchanged in whole or in
part for the individual Preferred Securities represented thereby, a Global
Preferred Security may not be transferred except as a whole by the Depositary
for such Global Preferred Security to a nominee of such Depositary or by a
nominee of such Depositary to such Depositary or another nominee of such
Depositary or by the Depositary or any nominee to a successor Depositary or
any nominee of such successor.
 
  The specific terms of the depositary arrangement with respect to a series of
Preferred Securities will be described in the Prospectus Supplement relating
to such series. The Corporation anticipates that the following provisions will
generally apply to depositary arrangements. See "Book-Entry Issuance."
 
  Upon the issuance of a Global Preferred Security, and the deposit of such
Global Preferred Security with or on behalf of the Depositary, the Depositary
for such Global Preferred Security or its nominee will credit, on its book-
entry registration and transfer system, the respective aggregate Liquidation
Amounts of the individual
 
                                      31
<PAGE>
 
Preferred Securities represented by such Global Preferred Securities to the
accounts of Participants. Such accounts shall be designated by the dealers,
underwriters or agents with respect to such Preferred Securities or by the
Corporation if such Preferred Securities are offered and sold directly by the
Corporation. Ownership of beneficial interests in a Global Preferred Security
will be limited to Participants or persons that may hold interests through
Participants. Ownership of beneficial interests in such Global Preferred
Security will be shown on, and the transfer of that ownership will be effected
only through, records maintained by the applicable Depositary or its nominee
(with respect to interests of Participants) and the records of Participants
(with respect to interests of persons who hold through Participants). The laws
of some states require that certain purchasers of securities take physical
delivery of such securities in definitive form. Such limits and such laws may
impair the ability to transfer beneficial interests in a Global Preferred
Security.
 
  So long as the Depositary for a Global Preferred Security, or its nominee,
is the registered owner of such Global Preferred Security, such Depositary or
such nominee, as the case may be, will be considered the sole owner or holder
of the Preferred Securities represented by such Global Preferred Security for
all purposes under the Indenture governing such Preferred Securities. Except
as provided below, owners of beneficial interests in a Global Preferred
Security will not be entitled to have any of the individual Preferred
Securities of the series represented by such Global Preferred Security
registered in their names, will not receive or be entitled to receive physical
delivery of any such Preferred Securities of such series in definitive form
and will not be considered the owners or holders thereof under the Indenture.
 
  Payments of principal of (and premium, if any) and interest on individual
Preferred Securities represented by a Global Preferred Security registered in
the name of a Depositary or its nominee will be made to the Depositary or its
nominee, as the case may be, as the registered owner of the Global Preferred
Security representing such Preferred Securities. None of the Corporation, the
Property Trustee, any Paying Agent, or the Securities Registrar for such
Preferred Securities will have any responsibility or liability for any aspect
of the records relating to or payments made on account of beneficial ownership
interests of the Global Preferred Security representing such Preferred
Securities or for maintaining, supervising or reviewing any records relating
to such beneficial ownership interests.
 
  The Corporation expects that the Depositary for a series of Preferred
Securities or its nominee, upon receipt of any payment of Liquidation Amount,
premium or Distributions, including any payment of Redemption Price, in
respect of a permanent Global Preferred Security representing any of such
Preferred Securities immediately will credit Participants' accounts with
payments in amounts proportionate to their respective beneficial interest in
the aggregate Liquidation Amount of such Global Preferred Security for such
Preferred Securities as shown on the records of such Depositary or its
nominee. The Corporation also expects that payments by Participants to owners
of beneficial interests in such Global Preferred Security held through such
Participants will be governed by standing instructions and customary
practices, as is now the case with securities held for the accounts of
customers in bearer form or registered in "street name." Such payments will be
the responsibility of such Participants.
 
  Unless otherwise specified in the applicable Prospectus Supplement, if a
Depositary for a series of Preferred Securities is at any time unwilling,
unable or ineligible to continue as depositary and a successor depositary is
not appointed by the Issuer within 90 days, or if there shall have occurred
and be continuing an event of default under the Indenture with respect to the
Subordinated Debentures of such series, the Issuer will issue individual
Preferred Securities of such series in exchange for the Global Preferred
Security representing such series of Preferred Securities. In addition, the
Issuer may at any time and in its sole discretion, subject to any limitations
described in the Prospectus Supplement relating to such Preferred Securities,
determine not to have any Preferred Securities of such series represented by
one or more Global Preferred Securities and, in such event, will issue
individual Preferred Securities of such series in exchange for the Global
Preferred Security or Securities representing such series of Preferred
Securities. Further, if the Issuer so specifies with respect to the Preferred
Securities of a series, an owner of a beneficial interest in a Global
Preferred Security representing Preferred
 
                                      32
<PAGE>
 
Securities of such series may, on terms acceptable to the Issuer, the Property
Trustee and the Depositary for such Global Preferred Security, receive
individual Preferred Securities of such series in exchange for such beneficial
interests, subject to any limitations described in the Prospectus Supplement
relating to such Preferred Securities. In any such instance, an owner of a
beneficial interest in a Global Preferred Security will be entitled to
physical delivery of individual Preferred Securities of the series represented
by such Global Preferred Security equal in principal amount to such beneficial
interest and to have such Preferred Securities registered in its name.
Individual Preferred Securities of such series so issued will be issued in
denominations, unless otherwise specified by the Issuer, and integral
multiples thereof that are the same as the denominations and multiples in
which the Preferred Securities are issued.
 
PAYMENT AND PAYING AGENCY
 
  Payments in respect of the Preferred Securities shall be made to the
Depositary, which shall credit the relevant accounts at the Depositary on the
applicable Distribution Dates or, if any Issuer's Preferred Securities are not
held by the Depositary, such payments shall be made by check mailed to the
address of the holder entitled thereto as such address shall appear on the
Securities Register. Unless otherwise specified in the applicable Prospectus
Supplement, the paying agent (the "Paying Agent") shall initially be the
Property Trustee and any co-paying agent chosen by the Property Trustee and
acceptable to the Administrative Trustees and the Corporation. The Paying
Agent shall be permitted to resign as Paying Agent upon 30 days' written
notice to the Property Trustee and the Corporation. In the event that the
Property Trustee shall no longer be the Paying Agent, the Administrative
Trustees shall appoint a successor (which shall be a bank or trust company
acceptable to the Administrative Trustees and the Corporation) to act as
Paying Agent.
 
REGISTRAR AND TRANSFER AGENT
 
  Unless otherwise specified in the applicable Prospectus Supplement, the
Property Trustee will act as registrar and transfer agent for the Preferred
Securities.
 
  Registration of transfers of Preferred Securities will be effected without
charge by or on behalf of each Issuer, but upon payment of any tax or other
governmental charges that may be imposed in connection with any transfer or
exchange. The Issuers will not be required to register or cause to be
registered the transfer of their Preferred Securities after such Preferred
Securities have been called for redemption.
 
INFORMATION CONCERNING THE PROPERTY TRUSTEE
 
  The Property Trustee, other than during the occurrence and continuance of an
Event of Default, undertakes to perform only such duties as are specifically
set forth in each Trust Agreement and, after such Event of Default, must
exercise the same degree of care and skill as a prudent person would exercise
or use in the conduct of his or her own affairs. Subject to this provision,
the Property Trustee is under no obligation to exercise any of the powers
vested in it by the applicable Trust Agreement at the request of any holder of
Preferred Securities unless it is offered reasonable indemnity against the
costs, expenses and liabilities that might be incurred thereby. If no Event of
Default has occurred and is continuing and the Property Trustee is required to
decide between alternative causes of action, construe ambiguous provisions in
the applicable Trust Agreement or is unsure of the application of any
provision of the applicable Trust Agreement, and the matter is not one on
which holders of Preferred Securities are entitled under such Trust Agreement
to vote, then the Property Trustee shall take such action as is directed by
the Corporation and if not so directed, shall take such action as it deems
advisable and in the best interests of the holders of the Trust Securities and
will have no liability except for its own bad faith, negligence or willful
misconduct.
 
 
                                      33
<PAGE>
 
MISCELLANEOUS
   
  The Issuer Trustees are authorized and directed to conduct the affairs of
and to operate the Issuers in such a way that no Issuer will be deemed to be
an "investment company" required to be registered under the Investment Company
Act or classified for United States federal income tax purposes as an
association taxable as a corporation or as other than a grantor trust and so
that the Corresponding Junior Subordinated Debentures will be treated as
indebtedness of the Corporation for United States federal income tax purposes.
In this connection, each Administrative Trustee, the Property Trustee and the
holders of at least a majority in Liquidation Amount of the Common Securities
are authorized to take any action, not inconsistent with applicable law, the
certificate of trust of each Issuer or each Trust Agreement, that such
Administrative Trustee, the Property Trustee or holders of Common Securities
determine in their discretion to be necessary or desirable for such purposes,
as long as such action does not adversely affect in any material respect the
interests of the holders of the Related Preferred Securities.     
 
  Holders of the Preferred Securities have no preemptive or similar rights.
 
  No Issuer may borrow money or issue debt or mortgage or pledge any of its
assets.
 
                              BOOK-ENTRY ISSUANCE
 
  DTC will act as securities depositary for all of the Preferred Securities
and the Junior Subordinated Debentures, unless otherwise referred to in the
Prospectus Supplement relating to an offering of Preferred Securities or
Junior Subordinated Debentures. The Preferred Securities and the Junior
Subordinated Debentures will be issued only as fully-registered securities
registered in the name of Cede & Co. (DTC's nominee). One or more fully-
registered global certificates will be issued for the Preferred Securities of
each Issuer and the Junior Subordinated Debentures, representing in the
aggregate the total number of such Issuer's Preferred Securities or aggregate
principal balance of Junior Subordinated Debentures, respectively, and will be
deposited with DTC.
 
  DTC is a limited purpose trust company organized under the New York Banking
Law, a "banking organization" within the meaning of the New York Banking Law,
a member of the Federal Reserve System, a "clearing corporation" within the
meaning of the New York Uniform Commercial Code, and a "clearing agency"
registered pursuant to the provisions of Section 17A of the Exchange Act. DTC
holds securities that its Participants deposit with DTC. DTC also facilitates
the settlement among Participants of securities transactions, such as
transfers and pledges, in deposited securities through electronic computerized
book-entry changes in Participants' accounts, thereby eliminating the need for
physical movement of securities certificates. "Direct Participants" include
securities brokers and dealers, banks, trust companies, clearing corporations
and certain other organizations. DTC is owned by a number of its Direct
Participants and by the New York Stock Exchange, Inc., the American Stock
Exchange, Inc. and the National Association of Securities Dealers, Inc. Access
to the DTC system is also available to others such as securities brokers and
dealers, banks and trust companies that clear through or maintain custodial
relationships with Direct Participants, either directly or indirectly
("Indirect Participants"). The rules applicable to DTC and its Participants
are on file with the Commission.
 
  Purchases of Preferred Securities or Junior Subordinated Debentures within
the DTC system must be made by or through Direct Participants, which will
receive a credit for the Preferred Securities or Junior Subordinated
Debentures on DTC's records. The ownership interest of each actual purchaser
of each Preferred Security and each Junior Subordinated Debenture ("Beneficial
Owner") is in turn to be recorded on the Direct and Indirect Participants'
records. Beneficial Owners will not receive written confirmation from DTC of
their purchases, but Beneficial Owners are expected to receive written
confirmations providing details of the transactions, as well as periodic
statements of their holdings, from the Direct or Indirect Participants through
which the Beneficial Owners purchased Preferred Securities or Junior
Subordinated Debentures. Transfers of ownership interests in the Preferred
Securities or Junior Subordinated Debentures are to be accomplished by entries
made on the books of Participants acting on behalf of Beneficial Owners.
Beneficial Owners will not receive certificates representing their ownership
interests in Preferred Securities or Junior Subordinated Debentures, except in
the event that use of the book-entry system for the Preferred Securities of
such Issuer or Junior Subordinated Debentures is discontinued.
 
                                      34
<PAGE>
 
  DTC has no knowledge of the actual Beneficial Owners of the Preferred
Securities or Junior Subordinated Debentures; DTC's records reflect only the
identity of the Direct Participants to whose accounts such Preferred
Securities or Junior Subordinated Debentures are credited, which may or may
not be the Beneficial Owners. The Participants will remain responsible for
keeping account of their holdings on behalf of their customers.
 
  Conveyance of notices and other communications by DTC to Direct
Participants, by Direct Participants to Indirect Participants, and by Direct
Participants and Indirect Participants to Beneficial Owners and the voting
rights of Direct Participants, Indirect Participants and Beneficial Owners
will be governed by arrangements among them, subject to any statutory or
regulatory requirements as may be in effect from time to time.
 
  Redemption notices will be sent to Cede & Co. as the registered holder of
the Preferred Securities or Junior Subordinated Debentures. If less than all
of an Issuer's Preferred Securities or the Junior Subordinated Debentures are
being redeemed, DTC's current practice is to determine by lot the amount of
the interest of each Direct Participant to be redeemed.
 
  Although voting with respect to the Preferred Securities or the Junior
Subordinated Debentures is limited to the holders of record of the Preferred
Securities or Junior Subordinated Debentures, in those instances in which a
vote is required, neither DTC nor Cede & Co. will itself consent or vote with
respect to Preferred Securities or Junior Subordinated Debentures. Under its
usual procedures, DTC would mail an omnibus proxy (the "Omnibus Proxy") to the
relevant Trustee as soon as possible after the record date. The Omnibus Proxy
assigns Cede & Co.'s consenting or voting rights to those Direct Participants
to whose accounts such Preferred Securities or Junior Subordinated Debentures
are credited on the record date (identified in a listing attached to the
Omnibus Proxy).
 
  Distribution payments on the Preferred Securities or the Junior Subordinated
Debentures will be made by the relevant Trustee to DTC. DTC's practice is to
credit Direct Participants' accounts on the relevant payment date in
accordance with their respective holdings shown on DTC's records unless DTC
has reason to believe that it will not receive payments on such payment date.
Payments by Participants to Beneficial Owners will be governed by standing
instructions and customary practices and will be the responsibility of such
Participant and not of DTC, the relevant Trustee, the Issuer thereof or the
Corporation, subject to any statutory or regulatory requirements as may be in
effect from time to time. Payment of Distributions to DTC is the
responsibility of the relevant Trustee, disbursement of such payments to
Direct Participants is the responsibility of DTC, and disbursements of such
payments to the Beneficial Owners is the responsibility of Direct and Indirect
Participants.
 
  DTC may discontinue providing its services as securities depositary with
respect to any of the Preferred Securities or the Junior Subordinated
Debentures at any time by giving reasonable notice to the relevant Trustee and
the Corporation. In the event that a successor securities depositary is not
obtained, definitive Preferred Security or Junior Subordinated Debenture
certificates representing such Preferred Securities or Junior Subordinated
Debentures are required to be printed and delivered. The Corporation, at its
option, may decide to discontinue use of the system of book-entry transfers
through DTC (or a successor depositary). After a Debenture Event of Default,
the holders of a majority in liquidation preference of Preferred Securities or
aggregate principal amount of Junior Subordinated Debentures may determine to
discontinue the system of book-entry transfers through DTC. In any such event,
definitive certificates for such Preferred Securities or Junior Subordinated
Debentures will be printed and delivered.
 
  The information in this section concerning DTC and DTC's book-entry system
has been obtained from sources that the Issuers and the Corporation believe to
be accurate, but the Issuers and the Corporation assume no responsibility for
the accuracy thereof. Neither the Issuers nor the Corporation has any
responsibility for the performance by DTC or its Participants of their
respective obligations as described herein or under the rules and procedures
governing their respective operations.
 
                                      35
<PAGE>
 
                           DESCRIPTION OF GUARANTEES
 
  A Guarantee will be executed and delivered by the Corporation concurrently
with the issuance by each Issuer of its Preferred Securities for the benefit
of the holders from time to time of such Preferred Securities. The First
National Bank of Chicago will act as indenture trustee ("Guarantee Trustee")
under each Guarantee for the purposes of compliance with the Trust Indenture
Act and each Guarantee will be qualified as an indenture under the Trust
Indenture Act. This summary of certain provisions of the Guarantees, which
summarizes the material terms thereof, does not purport to be complete and is
subject to, and qualified in its entirety by reference to, all of the
provisions of each Guarantee, including the definitions therein of certain
terms, and the Trust Indenture Act, to each of which reference is hereby made.
The form of the Guarantee has been filed as an exhibit to the Registration
Statement of which this Prospectus forms a part. Reference in this summary to
Preferred Securities means that Issuer's Preferred Securities to which a
Guarantee relates. The Guarantee Trustee will hold each Guarantee for the
benefit of the holders of the related Issuer's Preferred Securities.
 
GENERAL
 
  The Corporation will irrevocably agree to pay in full on a subordinated
basis, to the extent set forth herein, the Guarantee Payments (as defined
below) to the holders of the Preferred Securities, as and when due, regardless
of any defense, right of set-off or counterclaim that such Issuer may have or
assert other than the defense of payment. The following payments with respect
to the Preferred Securities, to the extent not paid by or on behalf of the
related Issuer (the "Guarantee Payments"), will be subject to the Guarantee:
(i) any accumulated and unpaid Distributions required to be paid on such
Preferred Securities, to the extent that such Issuer has funds on hand
available therefor at such time, (ii) the Redemption Price with respect to any
Preferred Securities called for redemption, to the extent that such Issuer has
funds on hand available therefor at such time, or (iii) upon a voluntary or
involuntary dissolution, winding up or liquidation of such Issuer (unless the
Corresponding Junior Subordinated Debentures are distributed to holders of
such Preferred Securities in exchange therefor), the lesser of (a) the
Liquidation Distribution and (b) the amount of assets of such Issuer remaining
available for distribution to holders of Preferred Securities after
satisfaction of liabilities to creditors of such Issuer as required by
applicable law. The Corporation's obligation to make a Guarantee Payment may
be satisfied by direct payment of the required amounts by the Corporation to
the holders of the applicable Preferred Securities or by causing the Issuer to
pay such amounts to such holders.
 
  Each Guarantee will be an irrevocable guarantee on a subordinated basis of
the related Issuer's obligations under the Preferred Securities, but will
apply only to the extent that such related Issuer has funds sufficient to make
such payments, and is not a guarantee of collection.
 
  If the Corporation does not make interest payments on the Corresponding
Junior Subordinated Debentures held by the Issuer, the Issuer will not be able
to pay Distributions on the Preferred Securities and will not have funds
legally available therefor. Each Guarantee will rank subordinate and junior in
right of payment to all Senior Debt of the Corporation. See "--Status of the
Guarantees." Because the Corporation is a holding company, the right of the
Corporation to participate in any distribution of assets of any subsidiary
upon such subsidiary's liquidation or reorganization or otherwise, is subject
to the prior claims of creditors of that subsidiary, except to the extent the
Corporation may itself be recognized as a creditor of that subsidiary.
Accordingly, the Corporation's obligations under the Guarantees will be
effectively subordinated to all existing and future liabilities of the
Corporation's subsidiaries, and claimants should look only to the assets of
the Corporation for payments thereunder. See "The Corporation." Except as
otherwise provided in the applicable Prospectus Supplement, the Guarantees do
not limit the incurrence or issuance of other secured or unsecured debt of the
Corporation, including Senior Debt, whether under the Indenture, any other
existing indenture or any other indenture that the Corporation may enter into
in the future or otherwise. See the applicable Prospectus Supplement relating
to any offering of Preferred Securities.
 
  The Corporation has, through the applicable Guarantee, the applicable Trust
Agreement, the applicable series of Corresponding Junior Subordinated
Debentures, the Indenture and the applicable Expense Agreement,
 
                                      36
<PAGE>
 
taken together, fully, irrevocably and unconditionally guaranteed all of the
Issuer's obligations under the Preferred Securities. No single document
standing alone or operating in conjunction with fewer than all of the other
documents constitutes such guarantee. It is only the combined operation of
these documents that has the effect of providing a full, irrevocable and
unconditional guarantee of the Issuer's obligations under the Preferred
Securities. See "Relationship Among the Preferred Securities, the
Corresponding Junior Subordinated Debentures, the Expense Agreement and the
Guarantees."
 
STATUS OF THE GUARANTEES
 
  Each Guarantee will constitute an unsecured obligation of the Corporation
and will rank subordinate and junior in right of payment to all Senior Debt of
the Corporation in the same manner as Junior Subordinated Debentures.
 
  Each Guarantee will rank pari passu with all other Guarantees issued by the
Corporation. Each Guarantee will constitute a guarantee of payment and not of
collection (i.e., the guaranteed party may institute a legal proceeding
directly against the Corporation to enforce its rights under the Guarantee
without first instituting a legal proceeding against any other person or
entity). Each Guarantee will be held for the benefit of the holders of the
related Preferred Securities. No Guarantee will be discharged except by
payment of the Guarantee Payments in full to the extent not paid by the Issuer
or upon distribution to the holders of the Preferred Securities of the
Corresponding Junior Subordinated Debentures. None of the Guarantees places a
limitation on the amount of additional Senior Debt that may be incurred by the
Corporation. The Corporation expects from time to time to incur additional
indebtedness constituting Senior Debt.
 
AMENDMENTS AND ASSIGNMENT
 
  Except with respect to any changes which do not materially adversely affect
the rights of holders of the related Preferred Securities (in which case no
vote will be required), no Guarantee may be amended without the prior approval
of the holders of not less than a majority of the aggregate Liquidation Amount
of such outstanding Preferred Securities. The manner of obtaining any such
approval will be as set forth under "Description of Preferred Securities--
Voting Rights; Amendment of Each Trust Agreement." All guarantees and
agreements contained in each Guarantee shall bind the successors, assigns,
receivers, trustees and representatives of the Corporation and shall inure to
the benefit of the holders of the related Preferred Securities then
outstanding.
 
EVENTS OF DEFAULT
 
  An event of default under each Guarantee will occur upon the failure of the
Corporation to perform any of its payment obligations thereunder or to perform
any non-payment obligations if such non-payment default remains unremedied for
30 days. The holders of not less than a majority in aggregate Liquidation
Amount of the related Preferred Securities have the right to direct the time,
method and place of conducting any proceeding for any remedy available to the
Guarantee Trustee in respect of such Guarantee or to direct the exercise of
any trust or power conferred upon the Guarantee Trustee under such Guarantee.
 
  Any holder of the Preferred Securities may institute a legal proceeding
directly against the Corporation to enforce its rights under such Guarantee
without first instituting a legal proceeding against the Issuer, the Guarantee
Trustee or any other person or entity.
 
  The Corporation, as guarantor, is required to file annually with the
Guarantee Trustee a certificate as to whether or not the Corporation is in
compliance with all the conditions and covenants applicable to it under the
Guarantee.
 
INFORMATION CONCERNING THE GUARANTEE TRUSTEE
 
  The Guarantee Trustee, other than during the occurrence and continuance of a
default by the Corporation in performance of any Guarantee, undertakes to
perform only such duties as are specifically set forth in each Guarantee and,
after default with respect to any Guarantee, must exercise the same degree of
care and skill as a
 
                                      37
<PAGE>
 
prudent person would exercise or use in the conduct of his or her own affairs.
Subject to this provision, the Guarantee Trustee is under no obligation to
exercise any of the powers vested in it by any Guarantee at the request of any
holder of any Preferred Securities unless it is offered reasonable indemnity
against the costs, expenses and liabilities that might be incurred thereby.
 
TERMINATION OF THE GUARANTEES
 
  Each Guarantee will terminate and be of no further force and effect upon
full payment of the Redemption Price of the related Preferred Securities, upon
full payment of the amounts payable upon liquidation of the related Issuer or
upon distribution of Corresponding Junior Subordinated Debentures to the
holders of the related Preferred Securities in exchange therefor. Each
Guarantee will continue to be effective or will be reinstated, as the case may
be, if at any time any holder of the related Preferred Securities must restore
payment of any sums paid under such Preferred Securities or such Guarantee.
 
GOVERNING LAW
 
  Each Guarantee will be governed by and construed in accordance with the laws
of the State of Illinois.
 
THE EXPENSE AGREEMENT
   
  Pursuant to the Expense Agreement entered into by the Corporation under each
Trust Agreement (the "Expense Agreement"), the Corporation will irrevocably
and unconditionally guarantee to each Person or entity to whom the Issuer
becomes indebted or liable, the full payment of any costs, expenses or
liabilities of the Issuer, other than obligations of the Issuer to pay to the
holders of any Preferred Securities or other similar interests in the Issuer
of the amounts due such holders pursuant to the terms of the Preferred
Securities or such other similar interests, as the case may be. The Expense
Agreement will be enforceable by third parties.     
 
     RELATIONSHIP AMONG THE PREFERRED SECURITIES, THE CORRESPONDING JUNIOR
       SUBORDINATED DEBENTURES, THE EXPENSE AGREEMENT AND THE GUARANTEES
 
FULL AND UNCONDITIONAL GUARANTEE
 
  Payments of Distributions and other amounts due on the Preferred Securities
(to the extent the Issuer has funds available for the payment of such
Distributions) are irrevocably guaranteed by the Corporation as and to the
extent set forth under "Description of Guarantees." Taken together, the
Corporation's obligations under each series of Corresponding Junior
Subordinated Debentures, the Indenture, the related Trust Agreement, the
related Expense Agreement, and the related Guarantee provide, in the
aggregate, a full, irrevocable and unconditional guarantee of payments of
Distributions and other amounts due on the Related Preferred Securities. No
single document standing alone or operating in conjunction with fewer than all
of the other documents constitutes such guarantee. It is only the combined
operation of these documents that has the effect of providing a full,
irrevocable and unconditional guarantee of the Issuer's obligations under the
Related Preferred Securities. If and to the extent that the Corporation does
not make payments on any series of Corresponding Junior Subordinated
Debentures, such Issuer will not pay Distributions or other amounts due on its
Related Preferred Securities. The Guarantees do not cover payment of
Distributions when the related Issuer does not have sufficient funds to pay
such Distributions. In such event, the remedy of a holder of a series of
Preferred Securities is to institute a legal proceeding directly against the
Corporation pursuant to the terms of the Indenture for enforcement of payment
of amounts of such Distributions to such holder. The obligations of the
Corporation under each Guarantee are subordinate and junior in right of
payment to all Senior Debt of the Corporation.
 
                                      38
<PAGE>
 
SUFFICIENCY OF PAYMENTS
 
  As long as payments of interest and other payments are made when due on each
series of Corresponding Junior Subordinated Debentures, such payments will be
sufficient to cover Distributions and other payments due on the Related
Preferred Securities, primarily because (i) the aggregate principal amount of
each series of Corresponding Junior Subordinated Debentures will be equal to
the sum of the aggregate stated Liquidation Amount of the Related Preferred
Securities and related Common Securities; (ii) the interest rate and interest
and other payment dates on each series of Corresponding Junior Subordinated
Debentures will match the Distribution rate and Distribution and other payment
dates for the Related Preferred Securities; (iii) the Corporation shall pay
for all and any costs, expenses and liabilities of such Issuer except the
Issuer's obligations to holders of its Preferred Securities under such
Preferred Securities; and (iv) each Trust Agreement provides that the Issuer
will not engage in any activity that is not consistent with the limited
purposes of such Issuer.
 
  Notwithstanding anything to the contrary in the Indenture, the Corporation
has the right to set-off any payment it is otherwise required to make
thereunder with and to the extent the Corporation has theretofore made, or is
concurrently on the date of such payment making, a payment under the related
Guarantee.
 
ENFORCEMENT RIGHTS OF HOLDERS OF PREFERRED SECURITIES
 
  A holder of any related Preferred Security may institute a legal proceeding
directly against the Corporation to enforce its rights under the related
Guarantee without first instituting a legal proceeding against the Guarantee
Trustee, the related Issuer or any other person or entity.
 
  A default or event of default under any Senior Debt of the Corporation would
not constitute a default or Event of Default under the Indenture. However, in
the event of payment defaults under, or acceleration of, Senior Debt of the
Corporation, the subordination provisions of the Indenture provide that no
payments may be made in respect of the Corresponding Junior Subordinated
Debentures until such Senior Debt has been paid in full or any payment default
thereunder has been cured or waived. Failure to make required payments on any
series of Corresponding Junior Subordinated Debentures would constitute a
Debenture Event of Default.
 
LIMITED PURPOSE OF ISSUERS
 
  Each Issuer's Preferred Securities evidence a beneficial interest in such
Issuer, and each Issuer exists for the sole purpose of issuing its Preferred
Securities and Common Securities and investing the proceeds thereof in
Corresponding Junior Subordinated Debentures. A principal difference between
the rights of a holder of a Preferred Security and a holder of a Corresponding
Junior Subordinated Debenture is that a holder of a Corresponding Junior
Subordinated Debenture is entitled to receive from the Corporation the
principal amount of and interest accrued on Corresponding Junior Subordinated
Debentures held, while a holder of Preferred Securities is entitled to receive
Distributions from such Issuer (or from the Corporation under the applicable
Guarantee) if and to the extent such Issuer has funds available for the
payment of such Distributions.
 
RIGHTS UPON TERMINATION
   
  Upon any voluntary or involuntary termination, winding-up or liquidation of
any Issuer involving the liquidation of the Corresponding Junior Subordinated
Debentures, after satisfaction of the liabilities to creditors of such Issuer
as required by applicable law, the holders of the related Preferred Securities
will be entitled to receive, out of the assets held by such Issuer, the
Liquidation Distribution in cash. See "Description of Preferred Securities--
Liquidation Distribution Upon Termination." Upon any voluntary or involuntary
liquidation or bankruptcy of the Corporation, the Property Trustee, as holder
of the Corresponding Junior Subordinated Debentures, would be a subordinated
creditor of the Corporation, subordinated in right of payment to all Senior
Debt as set forth in the Indenture, but entitled to receive payment in full of
principal and interest, before any stockholders of the Corporation receive
payments or distributions. Since the Corporation is the guarantor under each
Guarantee and has agreed to pay for all costs, expenses and liabilities of
each Issuer (other than the Issuer's obligations to the holders of its
Preferred Securities), the positions of a holder of such Preferred Securities
and a holder of such Corresponding Junior Subordinated Debentures relative to
other creditors and to stockholders of the Corporation in the event of
liquidation or bankruptcy of the Corporation are expected to be substantially
the same.     
 
                                      39
<PAGE>
 
                             PLAN OF DISTRIBUTION
 
  The Junior Subordinated Debentures or the Preferred Securities may be sold
in a public offering to or through underwriters or dealers designated from
time to time. The Corporation and each Issuer may sell its Junior Subordinated
Debentures or Preferred Securities as soon as practicable after effectiveness
of the Registration Statement of which this Prospectus forms a part. The names
of any underwriters or dealers involved in the sale of the Junior Subordinated
Debentures or Preferred Securities in respect of which this Prospectus is
delivered, the amount or number of Junior Subordinated Debentures and
Preferred Securities to be purchased by any such underwriters and any
applicable commissions or discounts will be set forth in the applicable
Prospectus Supplement.
 
  Underwriters may offer and sell Junior Subordinated Debentures or Preferred
Securities at a fixed price or prices, which may be changed, or from time to
time at market prices prevailing at the time of sale, at prices related to
such prevailing market prices or at negotiated prices. In connection with the
sale of Preferred Securities, underwriters may be deemed to have received
compensation from the Corporation and/or the applicable Issuer in the form of
underwriting discounts or commissions and may also receive commissions.
Underwriters may sell Junior Subordinated Debentures or Preferred Securities
to or through dealers, and such dealers may receive compensation in the form
of discounts, concessions or commissions from the underwriters.
 
  Any underwriting compensation paid by the Corporation and/or the applicable
Issuer to underwriters in connection with the offering of Junior Subordinated
Debentures or Preferred Securities, and any discounts, concessions or
commissions allowed by such underwriters to participating dealers, will be
described in an accompanying Prospectus Supplement. Underwriters and dealers
participating in the distribution of Junior Subordinated Debentures or
Preferred Securities may be deemed to be underwriters, and any discounts and
commissions received by them and any profit realized by them on resale of such
Junior Subordinated Debentures or Preferred Securities may be deemed to be
underwriting discounts and commissions, under the Securities Act. Underwriters
and dealers may be entitled, under agreement with the Corporation and the
applicable Issuer, to indemnification against and contribution toward certain
civil liabilities, including liabilities under the Securities Act, and to
reimbursement by the Corporation for certain expenses.
 
  In connection with the offering of the Preferred Securities of any Issuer,
such Issuer may grant to the underwriters an option to purchase additional
Preferred Securities to cover over-allotments, if any, at the initial public
offering price (with an additional underwriting commission), as may be set
forth in the accompanying Prospectus Supplement. If such Issuer grants any
over-allotment option, the terms of such over-allotment option will be set
forth in the Prospectus Supplement for such Preferred Securities.
 
  Underwriters and dealers may engage in transactions with, or perform
services for, the Corporation and/or the applicable Issuer and/or any of their
affiliates in the ordinary course of business.
 
  The Junior Subordinated Debentures and the Preferred Securities will be new
issues of securities and will have no established trading market. Any
underwriters to whom Junior Subordinated Debentures or Preferred Securities
are sold for public offering and sale may make a market in such Junior
Subordinated Debentures and Preferred Securities, but such underwriters will
not be obligated to do so and may discontinue any market making at any time
without notice. Such Junior Subordinated Debentures or Preferred Securities
may or may not be listed on a national securities exchange or automated
quotation system (including the Nasdaq Stock Market). No assurance can be
given as to the liquidity of or the existence of trading markets for any
Junior Subordinated Debentures or Preferred Securities.
 
                                      40
<PAGE>
 
                            VALIDITY OF SECURITIES
   
  Unless otherwise indicated in the applicable Prospectus Supplement, certain
matters of Delaware law relating to the validity of the Preferred Securities,
the enforceability of the Trust Agreements and the creation of the Issuers
will be passed upon by Richards, Layton & Finger, Wilmington, Delaware,
special Delaware counsel to the Corporation and the Issuers. Unless otherwise
indicated in the applicable Prospectus Supplement, the validity of the
Guarantees and the Junior Subordinated Debentures will be passed upon for the
Corporation by Schiff Hardin & Waite, Chicago, Illinois, and for the
underwriters by Sullivan & Cromwell, New York, New York. Schiff Hardin & Waite
will rely as to all matters of Delaware law upon the opinion of Richards,
Layton & Finger, and Sullivan & Cromwell will rely as to all matters of
Illinois law upon the opinion of Schiff Hardin & Waite. Certain matters
relating to United States federal income tax considerations will be passed
upon for the Corporation by Schiff Hardin & Waite, as tax counsel for the
Corporation.     
 
                                    EXPERTS
 
  The consolidated financial statements and schedules of the Corporation and
subsidiaries incorporated in this Prospectus by reference from the
Corporation's Annual Report on Form 10-K have been audited by Arthur Andersen
LLP, independent public accountants, as indicated in their report with respect
thereto, and are incorporated herein by reference in reliance upon the
authority of said firm as experts in accounting and auditing in giving said
report.
 
                                      41
<PAGE>
 
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 NO DEALER, SALESPERSON OR OTHER INDIVIDUAL HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED OR IN-
CORPORATED BY REFERENCE IN THIS PROSPECTUS SUPPLEMENT OR THE PROSPECTUS IN
CONNECTION WITH THE OFFER MADE BY THIS PROSPECTUS SUPPLEMENT AND THE PROSPEC-
TUS AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RE-
LIED UPON AS HAVING BEEN AUTHORIZED BY THE CORPORATION, THE ISSUERS OR BY THE
UNDERWRITERS. NEITHER THE DELIVERY OF THIS PROSPECTUS SUPPLEMENT AND THE PRO-
SPECTUS NOR ANY SALE MADE HEREUNDER AND THEREUNDER SHALL UNDER ANY CIRCUM-
STANCE CREATE AN IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF
THE CORPORATION OR THE ISSUERS SINCE THE DATE HEREOF. THIS PROSPECTUS SUPPLE-
MENT AND THE PROSPECTUS DO NOT CONSTITUTE AN OFFER OR SOLICITATION BY ANYONE
IN ANY JURISDICTION IN WHICH SUCH OFFER OR SOLICITATION IS NOT AUTHORIZED OR
IN WHICH THE PERSON MAKING SUCH OFFER OR SOLICITATION IS NOT QUALIFIED TO DO
SO OR TO ANYONE TO WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER OR SOLICITATION.
 
                                ---------------
 
                               TABLE OF CONTENTS
 
                             PROSPECTUS SUPPLEMENT
 
<TABLE>   
<CAPTION>
                                                                           PAGE
                                                                           ----
<S>                                                                        <C>
Risk Factors..............................................................  S-5
NTC Capital I............................................................. S-10
The Corporation........................................................... S-11
Consolidated Ratios of Earnings to Fixed Charges.......................... S-13
Use of Proceeds........................................................... S-13
Capitalization............................................................ S-14
Summary of Selected Consolidated Financial Data........................... S-15
Accounting Treatment...................................................... S-15
Certain Terms of Series A Preferred Securities............................ S-16
Certain Terms of Series A Subordinated Debentures......................... S-18
Certain Terms of Series A Guarantee....................................... S-22
Certain Federal Income Tax Consequences................................... S-23
Underwriting.............................................................. S-27
Validity of Securities.................................................... S-28
 
                                  PROSPECTUS
 
Available Information.....................................................    4
Incorporation of Certain Documents by Reference...........................    5
The Corporation...........................................................    6
Certain Regulatory Considerations.........................................    6
The Issuers...............................................................    9
Use of Proceeds...........................................................   10
Description of Junior Subordinated Debentures.............................   10
Description of Preferred Securities.......................................   22
Book-Entry Issuance.......................................................   34
Description of Guarantees.................................................   36
Relationship Among the Preferred Securities, the Corresponding Junior
 Subordinated Debentures, the Expense Agreement and the Guarantees........   38
Plan of Distribution......................................................   40
Validity of Securities....................................................   41
Experts...................................................................   41
</TABLE>    
 
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                                 $150,000,000
 
                                 NTC CAPITAL I
 
                                        %
                             PREFERRED SECURITIES,
                                   SERIES A
                     FULLY AND UNCONDITIONALLY GUARANTEED,
                            AS DESCRIBED HEREIN, BY
 
                          NORTHERN TRUST CORPORATION
 
                                  -----------
 
                             PROSPECTUS SUPPLEMENT
 
                                  -----------
 
 
 
                      REPRESENTATIVES OF THE UNDERWRITERS
 
                               JANUARY   , 1997
 
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<PAGE>
 
                                   PART II.
 
                    INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
<TABLE>     
   <S>                                                                <C>
   Registration fee under the Securities Act of 1933, as amended..... $ 75,758
   Blue Sky fees and expenses (including counsel fees)...............    5,000
   Fees of rating agencies...........................................  162,500
   Trustees' fee and expenses........................................   20,000
   Printing and engraving............................................  120,000
   Accounting services...............................................   25,000
   Legal fees of Registrant's counsel................................   75,000
   Miscellaneous.....................................................    6,742
                                                                      --------
     Total........................................................... $490,000
                                                                      ========
</TABLE>    
 
ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
  Section 145 of the Delaware General Corporation Law, Article Eighth of the
Corporation's Restated Certificate of Incorporation and the Underwriting
Agreement filed as Exhibit 1 provide for indemnification of the Corporation's
directors and officers in a variety of circumstances, which may include
liabilities under the Securities Act of 1933, as amended. Such Underwriting
Agreement also provides for indemnification of controlling persons of the
Corporation. The general effect of the provisions in the Corporation's
Restated Certificate of Incorporation and under the Delaware General
Corporation Law is to provide that the Corporation shall indemnify its
directors and officers against all liabilities and expenses reasonably
incurred in connection with the defense or settlement of any judicial or
administrative proceedings in which they become involved by reason of their
status as corporate directors or officers, if they acted in good faith and in
the reasonable belief that their conduct was neither unlawful (in the case of
criminal proceedings) nor inconsistent with the best interests of the
Corporation. With respect to legal proceedings by or in the right of the
Corporation in which a director or officer is adjudged liable for improper
performance of his duty to the Corporation, indemnification is limited by such
provisions to that amount which is permitted by the court. In addition, the
Corporation has purchased insurance as permitted by Delaware law on behalf of
directors, officers, employees or agents, which may cover liabilities under
the Securities Act of 1933, as amended, and the Corporation has entered into
insurance maintenance agreements with its directors under which the
Corporation is obligated to maintain insurance coverage for directors at
certain levels for specified periods.
 
  Under each Trust Agreement, the Corporation will agree to indemnify each of
the Trustees of the Issuer with respect thereto or any predecessor Trustee for
the Issuer, and to hold such Trustees harmless against any loss, damage,
claims, liability or expense incurred without negligence or bad faith on its
part, arising out of or in connection with the acceptance or administration of
the Trust Agreements, including the costs and expenses of defending itself
against any claim or liability in connection with the exercise or performance
of any of its powers or duties under the Trust Agreements.
 
ITEM 16. EXHIBITS.
 
<TABLE>   
<CAPTION>
 EXHIBIT
 -------
 <C>     <S>
   1     Form of Underwriting Agreement*
   3(a)  Restated Certificate of Incorporation of the Corporation, incorporated
          by reference to Exhibit 4 to the Corporation's Quarterly Report on
          Form 10-Q for the quarter ended March 31, 1993
   3(b)  By-laws of the registrant, incorporated by reference to Exhibit 3 to
          the registrant's Quarterly Report on Form 10-Q for the quarter ended
          March 31, 1996
   4(a)  Form of Junior Subordinated Indenture, dated as of January 1, 1997,
          between the Corporation and The First National Bank of Chicago, as
          Debenture Trustee
</TABLE>    
 
                                     II-1
<PAGE>
 
<TABLE>   
<CAPTION>
 EXHIBIT
 -------
 <C>     <S>
   4(b)  Certificate of Trust of NTC Capital I**
   4(c)  Trust Agreement of NTC Capital I
   4(d)  Certificate of Trust of NTC Capital II**
   4(e)  Trust Agreement of NTC Capital II
   4(f)  Certificate of Trust of NTC Capital III**
   4(g)  Trust Agreement of NTC Capital III
   4(h)  Form of Amended and Restated Trust Agreement of NTC Capital I, II and
          III
   4(i)  Form of Preferred Security Certificate for NTC Capital I, II and III
          (included as Exhibit E of Exhibit 4(h))
   4(j)  Form of Guarantee Agreement for NTC Capital I, II and III
   5(a)  Opinion of Schiff Hardin & Waite as to legality of the Junior
          Subordinated Debentures and the Guarantees to be issued by the
          Corporation
   5(b)  Opinion of Richards, Layton & Finger as to legality of the Preferred
          Securities to be issued by NTC Capital I
   5(c)  Opinion of Richards, Layton & Finger as to legality of the Preferred
          Securities to be issued by NTC Capital II
   5(d)  Opinion of Richards, Layton & Finger as to legality of the Preferred
          Securities to be issued by NTC Capital III
   8     Opinion of Schiff Hardin & Waite as to certain federal income tax
          matters
  12     Computation of ratios of earnings to fixed charges and earnings to
          fixed charges and preferred stock dividend requirements
  23(a)  Consent of Arthur Andersen LLP
  23(b)  Consent of Schiff Hardin & Waite (included in 5(a))
  23(c)  Consent of Richards, Layton & Finger (included in 5(b) through (d))
  24     Powers of Attorney
  25(a)  Form T-1 Statement of Eligibility of The First National Bank of
          Chicago to act as trustee under the Junior Subordinated Indenture**
  25(b)  Form T-1 Statement of Eligibility of The First National Bank of
          Chicago to act as trustee under the Amended and Restated Trust
          Agreement of NTC Capital I**
  25(c)  Form T-1 Statement of Eligibility of The First National Bank of
          Chicago to act as trustee under the Amended and Restated Trust
          Agreement of NTC Capital II**
  25(d)  Form T-1 Statement of Eligibility of The First National Bank of
          Chicago to act as trustee under the Amended and Restated Trust
          Agreement of NTC Capital III**
  25(e)  Form T-1 Statement of Eligibility of The First National Bank of
          Chicago under the Guarantee for the benefit of the holders of
          Preferred Securities of NTC Capital I**
  25(f)  Form T-1 Statement of Eligibility of The First National Bank of
          Chicago under the Guarantee for the benefit of the holders of
          Preferred Securities of NTC Capital II**
  25(g)  Form T-1 Statement of Eligibility of The First National Bank of
          Chicago under the Guarantee for the benefit of the holders of
          Preferred Securities of NTC Capital III**
</TABLE>    
- --------
   
*To be filed by a current report on Form 8-K to be incorporated by reference
herein.     
   
**Previously filed.     
 
ITEM 17. UNDERTAKINGS.
 
  Each of the undersigned Registrants hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, as amended, each
filing of the Registrant's annual report pursuant to Section 13(a) or Section
15(d) of the Securities Exchange Act of 1934 that is incorporated by reference
in this Registration Statement shall be deemed to be a new registration
statement relating to the securities offered herein, and the offering of such
securities at that time shall be deemed to be the initial bona fide offering
thereof.
 
                                     II-2
<PAGE>
 
  Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of
each Registrant pursuant to the provisions described under Item 15 above, or
otherwise, each Registrant has been advised that in the opinion of the
Securities and Exchange Commission such indemnification is against public
policy as expressed in the Act and is, therefore, unenforceable. In the event
that a claim for indemnification against such liabilities (other than the
payment by each Registrant of expenses incurred or paid by a director, officer
or controlling person of each Registrant in the successful defense of any
action, suit or proceeding) is asserted by such director, officer or
controlling person in connection with the securities being registered, each
Registrant will, unless in the opinion of its counsel the matter has been
settled by the controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Act and will be governed by the final adjudication
of such issue.
 
  Each of the undersigned Registrants hereby also undertakes:
 
  (1) to file, during any period in which offers or sales are being made, a
post-effective amendment to this Registration Statement:
 
    (i) to include any prospectus required by Section 10(a)(3) of the
  Securities Act of 1933;
 
    (ii) to reflect in the prospectus any facts or events arising after the
  effective date of this Registration Statement (or the most recent post-
  effective amendment thereto) which, individually or in the aggregate,
  represent a fundamental change in the information set forth in this
  Registration Statement. Notwithstanding the foregoing, any increase or
  decrease in volume of securities offered (if the total dollar value of
  securities offered would not exceed that which was registered) and any
  deviation from the low or high end of the estimated maximum offering range
  may be reflected in the form of prospectus filed with the Commission
  pursuant to Rule 424(b) if, in the aggregate, the changes in volume and
  price represent no more than a 20% change in the maximum aggregate offering
  price set forth in the "Calculation of Registration Fee" table in the
  effective registration statement; and
 
    (iii) to include any material information with respect to the plan of
  distribution not previously disclosed in this Registration Statement or any
  material change to such information in this Registration Statement;
 
provided, however, that paragraphs (1)(i) and (1)(ii) do not apply if the
information required to be included in post-effective amendment by those
paragraphs is contained in periodic reports filed by a Registrant pursuant to
Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are
incorporated by reference in this Registration Statement.
 
  (2) that, for the purpose of determining any liability under the Securities
Act of 1933, each such post-effective amendment shall be deemed to be a new
registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial
bona fide offering thereof.
 
  (3) to remove from registration by means of a post-effective amendment any
of the securities being registered which remain unsold at the termination of
the offering.
 
  (4) to provide to the underwriter at the closing specified in the
underwriting agreement certificates in such denominations and registered in
such names as required by the underwriter to permit prompt delivery to each
purchaser.
 
  (5) That, for the purposes of determining any liability under the Securities
Act of 1933:
 
    (i) The information omitted from the form of prospectus filed as part of
  this Registration Statement in reliance upon Rule 430A and contained in the
  form of prospectus filed by the Registration pursuant to Rule 424(b)(1) or
  (4) or 487(h) under the Securities Act shall be deemed to be part of this
  Registration Statement as of the time it was declared effective.
 
    (ii) Each post-effective amendment that contains a form of prospectus
  shall be deemed to be a new Registration Statement relating to the
  securities offered therein, and the offering of such securities at that
  time shall be deemed to be the initial bona fide offering thereof.
 
                                     II-3
<PAGE>
 
                                  SIGNATURES
   
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, AS AMENDED,
NORTHERN TRUST CORPORATION CERTIFIES THAT IT HAS REASONABLE GROUNDS TO BELIEVE
THAT IT MEETS ALL OF THE REQUIREMENTS FOR FILING ON FORM S-3 AND HAS DULY
CAUSED THIS REGISTRATION STATEMENT TO BE SIGNED ON ITS BEHALF BY THE
UNDERSIGNED, THEREUNTO DULY AUTHORIZED, IN THE CITY OF CHICAGO, STATE OF
ILLINOIS, ON THE 3RD DAY OF JANUARY, 1997.     
 
                                          Northern Trust Corporation
                                           (Registrant)
 
                                                     /s/ Perry R. Pero
                                          By: _________________________________
                                                       Perry R. Pero
                                              Senior Executive Vice President
                                                            and
                                                  Chief Financial Officer
 
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THIS
REGISTRATION STATEMENT HAS BEEN SIGNED BY THE FOLLOWING PERSONS IN THE
CAPACITIES INDICATED ON THE DATES INDICATED.
 
<TABLE>   
<CAPTION>
             SIGNATURE                           TITLE                    DATE
             ---------                           -----                    ----
 
 
<S>                                  <C>                           <C>
         William A. Osborn*          Chairman and Chief Executive   January 3, 1997
____________________________________   Officer
         William A. Osborn
 
         /s/ Perry R. Pero           Senior Executive Vice          January 3, 1997
____________________________________   President and Chief
           Perry R. Pero               Financial Officer
 
          Harry W. Short*            Senior Vice President and      January 3, 1997
____________________________________   Controller (Chief
           Harry W. Short              Accounting Officer)
 
         Dolores E. Cross*           Director                       January 3, 1997
____________________________________
          Dolores E. Cross
 
         Robert S. Hamada*           Director                       January 3, 1997
____________________________________
          Robert S. Hamada
 
         Barry G. Hastings*          Director                       January 3, 1997
____________________________________
         Barry G. Hastings
 
         Robert A. Helman*           Director                       January 3, 1997
____________________________________
          Robert A. Helman
 
          Arthur L. Kelly*           Director                       January 3, 1997
____________________________________
          Arthur L. Kelly
 
                                     Director
____________________________________
           Ardis Krainik
 
          Robert D. Krebs*           Director                       January 3, 1997
____________________________________
          Robert D. Krebs
 
</TABLE>    
 
 
 
                                     II-4
<PAGE>
 
<TABLE>   
<CAPTION>
             SIGNATURE                           TITLE                    DATE
             ---------                           -----                    ----
 
 
<S>                                  <C>                           <C>
       Frederick A. Krehbiel*        Director                       January 3, 1997
____________________________________
       Frederick A. Krehbiel
 
        William G. Mitchell*         Director                       January 3, 1997
____________________________________
        William G. Mitchell
 
         Edward J. Mooney*           Director                       January 3, 1997
____________________________________
          Edward J. Mooney
 
                                     Director
____________________________________
          Harold B. Smith
 
      /s/ William D. Smithburg       Director                       January 3, 1997
____________________________________
        William D. Smithburg
 
          Bide L. Thomas*            Director                       January 3, 1997
____________________________________
           Bide L. Thomas
</TABLE>    
 
 
       /s/ Perry R. Pero
*By____________________________
         Perry R. Pero
       Attorney-in-Fact
 
                                      II-5
<PAGE>
 
   
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, NTC CAPITAL I
CERTIFIES THAT IT HAS REASONABLE GROUNDS TO BELIEVE THAT IT MEETS ALL THE
REQUIREMENTS FOR FILING ON FORM S-3 AND HAS DULY CAUSED THIS REGISTRATION
STATEMENT TO BE SIGNED ON ITS BEHALF BY THE UNDERSIGNED, THEREUNTO DULY
AUTHORIZED, IN THE CITY OF CHICAGO, AND STATE OF ILLINOIS ON THE 3RD DAY OF
JANUARY, 1997.     
 
                                          NTC Capital I
 
                                          By: Northern Trust Corporation, as
                                             Depositor
 
                                                     /s/ Perry R. Pero
                                          By: _________________________________
   
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, NTC CAPITAL II
CERTIFIES THAT IT HAS REASONABLE GROUNDS TO BELIEVE THAT IT MEETS ALL THE
REQUIREMENTS FOR FILING ON FORM S-3 AND HAS DULY CAUSED THIS REGISTRATION
STATEMENT TO BE SIGNED ON ITS BEHALF BY THE UNDERSIGNED, THEREUNTO DULY
AUTHORIZED, IN THE CITY OF CHICAGO, AND STATE OF ILLINOIS ON THE 3RD DAY OF
JANUARY, 1997.     
 
                                          NTC Capital II
 
                                          By: Northern Trust Corporation, as
                                             Depositor
 
                                                     /s/ Perry R. Pero
                                          By: _________________________________
   
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, NTC CAPITAL III
CERTIFIES THAT IT HAS REASONABLE GROUNDS TO BELIEVE THAT IT MEETS ALL THE
REQUIREMENTS FOR FILING ON FORM S-3 AND HAS DULY CAUSED THIS REGISTRATION
STATEMENT TO BE SIGNED ON ITS BEHALF BY THE UNDERSIGNED, THEREUNTO DULY
AUTHORIZED, IN THE CITY OF CHICAGO, AND STATE OF ILLINOIS ON THE 3RD DAY OF
JANUARY, 1997.     
 
                                          NTC Capital III
 
                                          By: Northern Trust Corporation,as
                                             Depositor
 
                                                     /s/ Perry R. Pero
                                          By: _________________________________
 
 
                                     II-6

<PAGE>
 
                                                                    EXHIBIT 4(a)


================================================================================


                          NORTHERN TRUST CORPORATION



                                      to



                      THE FIRST NATIONAL BANK OF CHICAGO,
                                  as Trustee

                              ___________________

                         JUNIOR SUBORDINATED INDENTURE


                          Dated as of January __, 1997

                              ___________________


================================================================================
<PAGE>
 
                          NORTHERN TRUST CORPORATION

     Reconciliation and tie between the Trust Indenture Act of 1939 (including
cross-references to provisions of Sections 310 to and including 317 which,
pursuant to Section 318(c) of the Trust Indenture Act of 1939, as amended by the
Trust Reform Act of 1990, are a part of and govern the Indenture whether or not
physically contained therein) and the Junior Subordinated Indenture, dated as of
January __, 1997.

<TABLE>
<CAPTION>
TRUST INDENTURE                                                 INDENTURE
ACT SECTION                                                      SECTION
- ---------------                                                 --------
<S>            <C>                                              <C>
(S) 310        (a) (1), (2) and (5)............................ 6.9
               (a) (3)......................................... Not Applicable
               (a) (4)......................................... Not Applicable
               (b)............................................. 6.8, 6.10
               (c)............................................. Not Applicable
(S) 311        (a)............................................. 6.13
               (b)............................................. 6.13
               (b) (2)......................................... 7.3(a)(2)
(S) 312        (a)............................................. 7.1, 7.2(a)
               (b)............................................. 7.2(b)
               (c)............................................. 7.2(c)
(S) 313        (a)............................................. 7.3(a)
               (b)............................................. 7.3(b)
               (c)............................................. 7.3(a), 7.3(b)
               (d)............................................. 7.3(c)
(S) 314        (a) (1), (2) and (3)............................ 7.4
               (a) (4)......................................... 10.4
               (b)............................................. Not Applicable
               (c) (1)......................................... 1.2
               (c) (2)......................................... 1.2
               (c) (3)......................................... Not Applicable
               (d)............................................. Not Applicable
               (e)............................................. 1.2
               (f)............................................. Not Applicable
(S) 315        (a)............................................. 6.1(a)
               (b)............................................. 6.2, 7.3(a)
               (c)............................................. 6.1(b)
               (d)............................................. 6.1(c)
               (d) (1)......................................... 6.1(a) (1)
               (d) (2)......................................... 6.1(c) (2)
               (d) (3)......................................... 6.1(c) (3)
</TABLE>
<PAGE>
 
<TABLE>
<S>            <C>                                              <C> 
               (e)............................................. 5.14
(S) 316        (a)............................................. 1.1
               (a) (1) (A)..................................... 5.12
               (a) (1) (B)..................................... 5.13
               (a) (2)......................................... Not Applicable
               (b)............................................. 5.8
               (c)............................................. 1.4(f)
(S) 317        (a) (1)......................................... 5.3
               (a) (2)......................................... 5.4
               (b)............................................. 10.3
(S) 318        (a)............................................. 1.7
</TABLE>

- --------------
 Note: This reconciliation and tie shall not, for any purpose, be deemed to be a
       part of the Junior Subordinated Indenture.

<PAGE>
 
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>                                 
                                                                            Page
<S>                                                                         <C>
                                   ARTICLE I

            Definitions and Other Provisions of General Application


Section 1.1.  Definitions..................................................  1
Section 1.2.  Compliance Certificate and Opinions..........................  9
Section 1.3.  Forms of Documents Delivered to Trustee...................... 10
Section 1.4.  Acts of Holders.............................................. 10
Section 1.5.  Notices, Etc. to Trustee and Corporation..................... 12
Section 1.6.  Notice to Holders; Waiver.................................... 13
Section 1.7.  Conflict with Trust Indenture Act............................ 13
Section 1.8.  Effect of Headings and Table of Contents..................... 13
Section 1.9.  Successors and Assigns....................................... 13
Section 1.10. Separability Clause.......................................... 13
Section 1.11. Benefits of Indenture........................................ 13
Section 1.12. Governing Law................................................ 14
Section 1.13. Non-Business Days............................................ 14


                                  ARTICLE II

                                Security Forms

Section 2.1.  Forms Generally.............................................. 14
Section 2.2.  Form of Face of Security..................................... 15
Section 2.3.  Form of Reverse of Security.................................. 18
Section 2.4.  Additional Provisions Required in Global Security............ 20
Section 2.5.  Form of Trustee's Certificate of Authentication.............. 21


                                  ARTICLE III

                                The Securities

Section 3.1.  Title and Terms.............................................. 21
Section 3.2.  Denominations................................................ 24
Section 3.3.  Execution, Authentication, Delivery and Dating............... 24
Section 3.4.  Temporary Securities......................................... 26
Section 3.5.  Global Securities............................................ 26
Section 3.6.  Registration, Transfer and Exchange Generally................ 27
Section 3.7.  Mutilated, Destroyed, Lost and Stolen Securities............. 28
</TABLE>

                                    -i-    

<PAGE>
 
<TABLE> 
<CAPTION> 
                                                                            Page
<S>                                                                         <C>
Section 3.8.  Payment of Interest and Additional Interest; Interest 
                 Rights Preserved...........................................29
Section 3.9.  Persons Deemed Owners........................................ 30
Section 3.10. Cancellation................................................. 31
Section 3.11. Computation of Interest...................................... 31
Section 3.12. Deferrals of Interest Payment Dates.......................... 31
Section 3.13. Right of Set-Off............................................. 32
Section 3.14. Agreed Tax Treatment......................................... 32
Section 3.15. Shortening or Extension of Stated Maturity................... 33
Section 3.16. CUSIP Numbers................................................ 33


                                   ARTICLE IV

                          Satisfaction and Discharge

Section 4.1.  Satisfaction and Discharge of Indenture...................... 33
Section 4.2.  Application of Trust Money................................... 34


                                   ARTICLE V

                                   Remedies

Section 5.1.  Events of Default............................................ 35
Section 5.2.  Acceleration of Maturity; Rescission and Annulment........... 36
Section 5.3.  Collection of Indebtedness and Suits for Enforcement by
                 Trustee................................................... 37
Section 5.4.  Trustee May File Proofs of Claim............................. 37
Section 5.5.  Trustee May Enforce Claim Without Possession of Securities... 38
Section 5.6.  Application of Money Collected............................... 38
Section 5.7.  Limitation on Suits.......................................... 39
Section 5.8.  Unconditional Right of Holders to Receive Principal, Premium
                 an Interest; Direct Action by Holders of Preferred 
                     Securities............................................ 40
Section 5.9.  Restoration of Rights and Remedies........................... 40
Section 5.10. Rights and Remedies Cumulative............................... 40
Section 5.11. Delay or Omission Not Waiver................................. 40
Section 5.12. Control by Holders........................................... 41
Section 5.13. Waiver of Past Defaults...................................... 41
Section 5.14. Undertaking for Costs........................................ 41
Section 5.15. Waiver of Usury, Stay or Extension Laws...................... 42
</TABLE>

                                     -ii- 

<PAGE>
 
<TABLE> 
<CAPTION>
                                                                            Page

                                  ARTICLE VI

                                  The Trustee

<S>                                                                         <C>
Section 6.1.  Certain Duties and Responsibilities.......................... 42
Section 6.2.  Notice of Defaults........................................... 43
Section 6.3.  Certain Rights of Trustee.................................... 43
Section 6.4.  Not Responsible for Recitals or Issuance of Securities....... 44
Section 6.5.  May Hold Securities.......................................... 44
Section 6.6.  Money Held in Trust.......................................... 45
Section 6.7.  Compensation and Reimbursement............................... 45
Section 6.8.  Disqualification; Conflicting Interests...................... 45
Section 6.9.  Corporate Trustee Required; Eligibility...................... 46
Section 6.10. Resignation and Removal; Appointment of Successor............ 46
Section 6.11. Acceptance of Appointment by Successor....................... 47
Section 6.12. Merger, Conversion, Consolidation or Succession to Business.. 48
Section 6.13. Preferential Collection of Claims Against Corporation........ 49
Section 6.14. Appointment of Authenticating Agent.......................... 49


                                  ARTICLE VII

             Holder's Lists and Reports by Trustee and Corporation

Section 7.1.  Corporation to Furnish Trustee Names and Addresses of 
              Holders...................................................... 51
Section 7.2.  Preservation of Information, Communications to Holders....... 51
Section 7.3.  Reports by Trustee........................................... 51
Section 7.4.  Reports by Corporation....................................... 52



                                  ARTICLE VIII

              Consolidation, Merger, Conveyance, Transfer or Lease

Section 8.1.  Corporation May Consolidate, Etc., Only on Certain Terms..... 52
Section 8.2.  Successor Corporation Substituted............................ 53
</TABLE> 

                                     -iii-

<PAGE>
 
<TABLE> 
<CAPTION> 
                                                                            Page
<S>                                                                         <C>
                                  ARTICLE IX

                            Supplemental Indentures


Section 9.1.  Supplemental Indentures without Consent of Holders........... 53
Section 9.2.  Supplemental Indentures with Consent of Holders.............. 54
Section 9.3.  Execution of Supplemental Indentures......................... 56
Section 9.4.  Effect of Supplemental Indentures............................ 56
Section 9.5.  Conformity with Trust Indenture Act.......................... 56
Section 9.6.  Reference in Securities to Supplemental Indentures........... 56


                                   ARTICLE X

                                   Covenants
Section 10.1. Payment of Principal, Premium and Interest................... 56
Section 10.2. Maintenance of Office or Agency.............................. 57
Section 10.3. Money for Security Payments to be Held in Trust.............. 57
Section 10.4. Statement as to Compliance................................... 58
Section 10.5. Waiver of Certain Covenants.................................. 59
Section 10.6. Additional Sums.............................................. 59
Section 10.7. Additional Covenants......................................... 59
Section 10.8. Original Issue Discount...................................... 60


                                  ARTICLE XI

                           Redemption of Securities
Section 11.1  Applicability of This Article................................ 61
Section 11.2. Election to Redeem; Notice to Trustee........................ 61
Section 11.3. Selection of Securities to be Redeemed....................... 61
Section 11.4. Notice of Redemption......................................... 62
Section 11.5. Deposit of Redemption Price.................................. 63
Section 11.6. Payment of Securities Called for Redemption.................. 63
Section 11.7. Right of Redemption of Securities Initially Issued to an
                 Issuer Trust.............................................. 63
</TABLE>

                                     -iv-

<PAGE>
 
<TABLE>
<CAPTION>
                                                                           Page
<S>                                                                        <C>
                                  ARTICLE XII

                                 Sinking Funds

Section 12.1. Applicability of Article..................................... 64
Section 12.2. Satisfaction of Sinking Fund Payments with Securities........ 64
Section 12.3. Redemption of Securities for Sinking Fund.................... 64


                                 ARTICLE XIII

                          Subordination of Securities

Section 13.1. Securities Subordinate to Senior Indebtedness................ 66
Section 13.2. No Payment When Senior Indebtedness in Default; Payment
                 Over of Proceeds Upon Dissolution, Etc.................... 66
Section 13.3. Payment Permitted If No Default.............................. 68
Section 13.4. Subrogation to Rights of Holders of Senior Indebtedness...... 68
Section 13.5. Provisions Solely to Define Relative Rights.................. 68
Section 13.6. Trustee to Effectuate Subordination.......................... 69
Section 13.7. No Waiver of Subordination Provisions........................ 69
Section 13.8. Notice to Trustee............................................ 69
Section 13.9. Reliance on Judicial Order or Certificate of Liquidating
                  Agent.................................................... 70
Section 13.10. Trustee Not Fiduciary for Holders of Senior Indebtedness.... 70
Section 13.11. Rights of Trustee as Holder of Senior Indebtedness;
                 Preservation of Trustee's Rights.......................... 70
Section 13.12. Article Applicable to Paying Agents......................... 70
</TABLE>

                                      -v-

<PAGE>
 
     JUNIOR SUBORDINATED INDENTURE, dated as of January __, 1997, between
NORTHERN TRUST CORPORATION, a Delaware corporation (the "Corporation"), having
its principal office at Fifty South LaSalle Street, Chicago, Illinois 60675, and
THE FIRST NATIONAL BANK OF CHICAGO, a national banking association, as Trustee
(the "Trustee").


                          Recitals of the Corporation

     Whereas, the Corporation has duly authorized the execution and delivery of
this Indenture to provide for the issuance from time to time of its unsecured
junior subordinated debt securities in series (hereinafter called the
"Securities") of substantially the tenor hereinafter provided, including
Securities issued to evidence loans made to the Corporation of the proceeds from
the issuance from time to time by one or more business trusts (each an "Issuer
Trust") of undivided preferred beneficial interests in the assets of such Issuer
Trusts (the "Preferred Securities") and undivided common beneficial interests in
the assets of such Issuer Trusts (the "Common Securities" and, collectively with
the Preferred Securities, the "Trust Securities"), and to provide the terms and
conditions upon which the Securities are to be authenticated, issued and
delivered; and

     Whereas, all things necessary to make this Indenture a valid agreement of
the Corporation, in accordance with its terms, have been done.

     Now Therefore, this Indenture Witnesseth:

     For and in consideration of the premises and the purchase of the Securities
by the Holders thereof, it is mutually covenanted and agreed, for the equal and
proportionate benefit of all Holders of the Securities or of any series thereof,
as follows:


                                   ARTICLE I

            Definitions and Other Provisions of General Application

     Section 1.1. Definitions.

     For all purposes of this Indenture, except as otherwise expressly provided
or unless the context otherwise requires:

          (1) The terms defined in this Article have the meanings assigned to
     them in this Article, and include the plural as well as the singular;

          (2) All other terms used herein that are defined in the Trust
     Indenture Act, either directly or by reference therein, have the meanings
     assigned to them therein;

          (3) The words "include", "includes" and "including" shall be deemed to
     be followed by the phrase "without limitation";

          (4) All accounting terms not otherwise defined herein have the
     meanings assigned to

<PAGE>
 
     them in accordance with generally accepted accounting principles;

          (5) Whenever the context may require, any gender shall be deemed to
     include the others;

          (6) Unless the context otherwise requires, any reference to an
     "Article" or a "Section" refers to an Article or a Section, as the case may
     be, of this Indenture; and

          (7) The words "hereby", "herein", "hereof" and "hereunder" and other
     words of similar import refer to this Indenture as a whole and not to any
     particular Article, Section or other subdivision.

     "Act" when used with respect to any Holder has the meaning specified in
Section 1.4.

     "Additional Interest" means the interest, if any, that shall accrue on any
interest on the Securities of any series the payment of which has not been made
on the applicable Interest Payment Date and which shall accrue at the rate per
annum specified or determined as specified in such Security.

     "Additional Sums" has the meaning specified in Section 10.6.

     "Additional Taxes" means any additional taxes, duties and other
governmental charges to which an Issuer Trust has become subject from time to
time as a result of a Tax Event.

     "Administrative Trustees" means, in respect of any Issuer Trust, each
Person identified as an "Administrative Trustee" in the related Trust Agreement,
solely in such Person's capacity as Administrative Trustee of such Issuer Trust
under such Trust Agreement and not in such Person's individual capacity, or any
successor administrative trustee appointed as therein provided.

     "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person. For the purposes of this definition,
"control" when used with respect to any specified Person means the power to
direct the management and policies of such Person, directly or indirectly,
whether through the ownership of voting securities, by contract or otherwise;
and the terms "controlling" and "controlled" have meanings correlative to the
foregoing.

     "Agent Member" means any member of, or participant in, the Depositary.

     "Applicable Procedures" means, with respect to any transfer or transaction
involving a Global Security or beneficial interest therein, the rules and
procedures of the Depositary for such Security, in each case to the extent
applicable to such transaction and as in effect from time to time.

     "Authenticating Agent" means any Person authorized by the Trustee pursuant
to Section 6.14 to act on behalf of the Trustee to authenticate Securities of
one or more series.

     "Bankruptcy Code" means Title 11 of the United States Code or any successor
statute thereto, in each case as amended from time to time.

                                      -2-
<PAGE>
 
     "Board of Directors" means the board of directors of the Corporation or the
Executive Committee of the board of directors of the Corporation (or any other
committee of the board of directors of the Corporation performing similar
functions) or a committee designated by the board of directors of the
Corporation (or such committee), comprised of two or more members of the board
of directors of the Corporation or officers of the Corporation, or both.

     "Board Resolution" means a copy of a resolution certified by the Secretary
or an Assistant Secretary of the Corporation to have been duly adopted by the
Board of Directors, or officers of the Corporation to which authority to act on
behalf of the Board of Directors has been delegated, and to be in full force and
effect on the date of such certification, and delivered to the Trustee.

     "Business Day" means any day other than (i) a Saturday or Sunday, (ii) a
day on which banking institutions in the City of New York or the City of
Chicago, Illinois are authorized or required by law or executive order to remain
closed, or (iii) a day on which the Corporate Trust Office of the Trustee, or,
with respect to the Securities of a series initially issued to an Issuer Trust
for so long as such Securities are held by such Issuer Trust, the "Corporate
Trust Office" (as defined in the related Trust Agreement) of the Property
Trustee or the Delaware Trustee under the related Trust Agreement, is closed for
business.

     "Capital Treatment Event" means, in respect of any Issuer Trust, the
reasonable determination by the Corporation (as evidenced by an Officers'
Certificate delivered to the Trustee) that, as a result of the occurrence of any
amendment to, or change (including any announced prospective change) in, the
laws (or any rules or regulations thereunder) of the United States or any
political subdivision thereof or therein, or as a result of any official or
administrative pronouncement or action or judicial decision interpreting or
applying such laws, rules or regulations, which amendment or change is effective
or which pronouncement, action or decision is announced on or after the date of
issuance of the Preferred Securities of such Issuer Trust, there is more than an
insubstantial risk that the Corporation will not be entitled to treat an amount
equal to the aggregate Liquidation Amount (as such term is defined in the
related Trust Agreement) of such Preferred Securities as "Tier 1" capital (or
the then equivalent thereof) for purposes of the capital adequacy guidelines of
the Federal Reserve, as then in effect and applicable to the Corporation.

     "Commission" means the Securities and Exchange Commission, as from time to
time constituted, created under the Exchange Act, or if at any time after the
execution of this instrument such Commission is not existing and performing the
duties now assigned to it under the Trust Indenture Act, then the body
performing such duties on such date.

     "Common Securities" has the meaning specified in the first recital of this
Indenture.

     "Common Stock" means the common stock, par value $1.66 2/3 per share, of
the Corporation.

     "Corporate Trust Office" means the principal office of the Trustee at which
at any particular time its corporate trust business shall be administered.

     "corporation" includes a corporation, association, company, limited
liability company, joint-stock company or business trust.

                                      -3-
<PAGE>
 
     "Corporation" means the Person named as the "Corporation" in the first
paragraph of this instrument until a successor corporation shall have become
such pursuant to the applicable provisions of this Indenture, and thereafter
"Corporation" shall mean such successor corporation.

     "Corporation Request" and "Corporation Order" mean, respectively, the
written request or order signed in the name of the Corporation by its Chairman
of the Board of Directors, its Vice Chairman of the Board of Directors, its
President or a Vice President, and by its Treasurer, an Assistant Treasurer, its
Secretary or an Assistant Secretary, and delivered to the Trustee.

     "Debt" means, with respect to any Person, whether recourse is to all or a
portion of the assets of such Person and whether or not contingent and without
duplication, (i) every obligation of such Person for money borrowed; (ii) every
obligation of such Person evidenced by bonds, debentures, notes or other similar
instruments, including obligations incurred in connection with the acquisition
of property, assets or businesses; (iii) every reimbursement obligation of such
Person with respect to letters of credit, bankers' acceptances or similar
facilities issued for the account of such Person; (iv) every obligation of such
Person issued or assumed as the deferred purchase price of property or services
(but excluding trade accounts payable or accrued liabilities arising in the
ordinary course of business); (v) every capital lease obligation of such Person;
(vi) all indebtedness of the Corporation, whether incurred on or prior to the
date of this Indenture or thereafter incurred, for claims in respect of
derivative products, including interest rate, foreign exchange rate and
commodity forward contracts, options and swaps and similar arrangements; and
(vii) every obligation of the type referred to in clauses (i) through (vi) of
another Person and all dividends of another Person the payment of which, in
either case, such Person has guaranteed or is responsible or liable for,
directly or indirectly, as obligor or otherwise.

     "Defaulted Interest" has the meaning specified in Section 3.8.

     "Delaware Trustee" means, with respect to any Issuer Trust, the Person
identified as the "Delaware Trustee" in the related Trust Agreement, solely in
its capacity as Delaware Trustee of such Issuer Trust under such Trust Agreement
and not in its individual capacity, or its successor in interest in such
capacity, or any successor Delaware trustee appointed as therein provided.

     "Depositary" means, with respect to the Securities of any series issuable
or issued in whole or in part in the form of one or more Global Securities, the
Person designated as Depositary by the Corporation pursuant to Section 3.1 with
respect to such series (or any successor thereto).

     "Discount Security" means any security that provides for an amount less
than the principal amount thereof to be due and payable upon a declaration of
acceleration of the Maturity thereof pursuant to Section 5.2.

     "Distributions", with respect to the Trust Securities issued by an Issuer
Trust, means amounts payable in respect of such Trust Securities as provided in
the related Trust Agreement and referred to therein as "Distributions."

     "Dollar" or "$" means the currency of the United States of America that, as
at the time of payment, is legal tender for the payment of public and private
debts.

                                      -4-
<PAGE>
 
     "Event of Default", unless otherwise specified with respect to a series of
Securities as contemplated by Section 3.1, has the meaning specified in Article
V.

     "Exchange Act" means the Securities Exchange Act of 1934 or any statute
successor thereto, in each case as amended from time to time.

     "Expiration Date" has the meaning specified in Section 1.4.

     "Extension Period" has the meaning specified in Section 3.12.

     "Federal Reserve" means the Board of Governors of the Federal Reserve
System.

     "Global Security" means a Security in the form prescribed in Section 2.4
evidencing all or part of a series of Securities, issued to the Depositary or
its nominee for such series, and registered in the name of such Depositary or
its nominee.

     "Guarantee Agreement" means, with respect to any Issuer Trust, the
Guarantee Agreement executed by the Corporation for the benefit of the Holders
of the Preferred Securities issued by such Issuer Trust as modified, amended or
supplemented from time to time.

     "Holder" means a Person in whose name a Security is registered in the
Securities Register.

     "Indenture" means this instrument as originally executed or as it may from
time to time be supplemented or amended by one or more indentures supplemental
hereto entered into pursuant to the applicable provisions hereof and shall
include the terms of each particular series of Securities established as
contemplated by Section 3.1.

     "Interest Payment Date" means, as to each series of Securities, the Stated
Maturity of an installment of interest on such Securities.

     "Investment Company Act" means the Investment Company Act of 1940 or any
successor statute thereto, in each case as amended from time to time.

     "Issuer Trust" has the meaning specified in the first recital of this
Indenture.

     "Maturity" when used with respect to any Security means the date on which
the principal of such Security or any installment of principal becomes due and
payable as therein or herein provided, whether at the Stated Maturity or by
declaration of acceleration, call for redemption or otherwise.

     "Notice of Default" means a written notice of the kind specified in Section
5.1(3).

     "Officers' Certificate" means a certificate signed by the Chairman of the
Board, a Vice Chairman of the Board, the President or a Vice President, and by
the Treasurer, an Assistant Treasurer, the Secretary or an Assistant Secretary,
of the Corporation and delivered to the Trustee.

     "Opinion of Counsel" means a written opinion of counsel, who may be counsel
for or an employee of the Corporation or any Affiliate of the Corporation.

                                      -5-
<PAGE>
 
     "Original Issue Date" means the date of issuance specified as such in each
Security.

     "Outstanding" means, when used in reference to any Securities, as of the
date of determination, all Securities theretofore authenticated and delivered
under this Indenture, except:

          (i)   Securities theretofore canceled by the Trustee or delivered to
     the Trustee for cancellation;

          (ii)  Securities for whose payment money in the necessary amount has
     been theretofore deposited with the Trustee or any Paying Agent in trust
     for the Holders of such Securities; and

          (iii) Securities in substitution for or in lieu of which other
     Securities have been authenticated and delivered or that have been paid
     pursuant to Section 3.7, unless proof satisfactory to the Trustee is
     presented that any such Securities are held by Holders in whose hands such
     Securities are valid, binding and legal obligations of the Corporation;

provided, however, that in determining whether the Holders of the requisite
principal amount of Outstanding Securities have given any request, demand,
authorization, direction, notice, consent or waiver hereunder, Securities owned
by the Corporation or any other obligor upon the Securities or any Affiliate of
the Corporation or such other obligor shall be disregarded and deemed not to be
Outstanding, except that, in determining whether the Trustee shall be protected
in relying upon any such request, demand, authorization, direction, notice,
consent or waiver, only Securities that the Trustee knows to be so owned shall
be so disregarded. Securities so owned that have been pledged in good faith may
be regarded as Outstanding if the pledgee establishes to the satisfaction of the
Trustee the pledgee's right so to act with respect to such Securities and that
the pledgee is not the Corporation or any other obligor upon the Securities or
any Affiliate of the Corporation or such other obligor. Upon the written request
of the Trustee, the Corporation shall furnish to the Trustee promptly an
Officers' Certificate listing and identifying all Securities, if any, known by
the Corporation to be owned or held by or for the account of the Corporation, or
any other obligor on the Securities or any Affiliate of the Corporation or such
obligor, and subject to the provisions of Section 6.1, the Trustee shall be
entitled to accept such Officers' Certificate as conclusive evidence of the
facts therein set forth and of the fact that all Securities not listed therein
are Outstanding for the purpose of any such determination. Notwithstanding
anything herein to the contrary, Securities of any series initially issued to an
Issuer Trust that are owned by such Issuer Trust shall be deemed to be
Outstanding notwithstanding the ownership by the Corporation or an Affiliate of
any beneficial interest in such Issuer Trust.

     "Paying Agent" means the Trustee or any Person authorized by the
Corporation to pay the principal of (or premium, if any) or interest on, or
other amounts in respect of, any Securities on behalf of the Corporation.

     "Person" means a legal person, including any individual, corporation,
estate, partnership, joint venture, trust, unincorporated association, or
government or any agency or political subdivision thereof, or any other entity
of whatever nature.

     "Place of Payment" means, with respect to the Securities of any series, the
place or places

                                      -6-
<PAGE>
 
where the principal of (and premium, if any) and interest (including any
Additional Interest) on the Securities of such series are payable pursuant to
Section 3.1.

     "Predecessor Security" of any particular Security means every previous
Security evidencing all or a portion of the same debt as that evidenced by such
particular Security. For the purposes of this definition, any security
authenticated and delivered under Section 3.7 in lieu of a mutilated, destroyed,
lost or stolen Security shall be deemed to evidence the same debt as the
mutilated, destroyed, lost or stolen Security.

     "Preferred Securities" has the meaning specified in the first recital of
this Indenture.

     "Proceeding" has the meaning specified in Section 13.2.

     "Property Trustee" means, with respect to any Issuer Trust, the Person
identified as the "Property Trustee" in the related Trust Agreement, solely in
its capacity as Property Trustee of such Issuer Trust under such Trust Agreement
and not in its individual capacity, or its successor in interest in such
capacity, or any successor property trustee appointed as therein provided.

     "Redemption Date", when used with respect to any Security to be redeemed,
means the date fixed for such redemption by or pursuant to this Indenture or the
terms of such Security.

     "Redemption Price", when used with respect to any Security to be redeemed,
means the price at which it is to be redeemed pursuant to this Indenture.

     "Regular Record Date" for the interest payable on any Interest Payment Date
with respect to the Securities of a series means, unless otherwise provided
pursuant to Section 3.1 with respect to Securities of such series, the date that
is fifteen days next preceding such Interest Payment Date (whether or not a
Business Day).

     "Responsible Officer", when used with respect to the Trustee, means the
chairman or any vice-chairman of the board of directors, the chairman or any
vice-chairman of the executive committee of the board of directors, the chairman
of the trust committee, the president, any vice president, the secretary, any
assistant secretary, the treasurer, any assistant treasurer, the cashier, any
assistant cashier, any trust officer or assistant trust officer, the controller
or any assistant controller or any other officer of the Trustee customarily
performing functions similar to those performed by any of the above designated
officers and also means, with respect to a particular corporate trust matter,
any other officer to whom such matter is referred because of his knowledge of
and familiarity with the particular subject.

     "Rights Plan" means a plan of the Corporation providing for the issuance by
the Corporation to all holders of Common Stock of rights entitling the holders
thereof to subscribe for or purchase shares of any class or series of capital
stock of the Corporation which rights (i) are deemed to be transferred with such
shares of Common Stock, and (ii) are also issued in respect of future issuances
of Common Stock, in each case until the occurrence of a specified event or
events.

     "Securities" or "Security" means any debt securities or debt security, as
the case may be, authenticated and delivered under this Indenture.

                                      -7-
<PAGE>
 
     "Securities Act" means the Securities Act of 1933 or any successor statute
thereto, in each case as amended from time to time.

     "Securities Register" and "Securities Registrar" have the respective
meanings specified in Section 3.6.

     "Senior Indebtedness" means the principal of (and premium, if any) and
interest, if any (including interest accruing on or after the filing of any
petition in bankruptcy or for reorganization relating to the Corporation whether
or not such claim for post-petition interest is allowed in such proceeding), on
Debt of the Corporation, whether incurred on or prior to the date of this
Indenture or thereafter incurred, unless, in the instrument creating or
evidencing the same or pursuant to which the same is outstanding, it is provided
that such obligations are not superior in right of payment to the Securities or
to other Debt that is pari passu with, or subordinated to, the Securities,
provided, however, that Senior Indebtedness shall be deemed to include
securities issued under the indenture dated as of September 1, 1990, as amended,
by and between the Corporation and CoreStates Bank, N.A. (as successor to
Philadelphia National Bank), as trustee, and shall not be deemed to include (a)
any Debt of the Corporation that, when incurred and without respect to any
election under Section 1111(b) of the Bankruptcy Code, was without recourse to
the Corporation, (b) any Debt of the Corporation to any of its Subsidiaries, (c)
any Debt to any employee of the Corporation, (d) any Securities, (e) trade
accounts payable of the Corporation, and (g) accrued liabilities arising in the
ordinary course of business of the Corporation.

     "Special Record Date" for the payment of any Defaulted Interest means a
date fixed by the Trustee pursuant to Section 3.8.

     "Stated Maturity", when used with respect to any Security or any
installment of principal thereof (or premium, if any) or interest (including any
Additional Interest) thereon, means the date specified pursuant to the terms of
such Security as the fixed date on which the principal of such Security or such
installment of principal (or premium, if any) or interest (including any
Additional Interest) is due and payable, as such date may, in the case of the
stated maturity of the principal on any security, be shortened or extended as
provided pursuant to the terms of such Security and this Indenture and, in the
case of any installment of interest, subject to the deferral of any such date in
the case of any Extension Period.

     "Subsidiary" means a corporation more than 50% of the outstanding voting
stock of which is owned, directly or indirectly, by the Corporation or by one or
more other Subsidiaries, or by the Corporation and one or more other
Subsidiaries. For purposes of this definition, "voting stock" means stock that
ordinarily has voting power for the election of directors, whether at all times
or only so long as no senior class of stock has such voting power by reason of
any contingency.

     "Successor Security" of any particular Security means every Security issued
after, and evidencing all or a portion of the same debt as that evidenced by,
such particular Security; and, for the purposes of this definition, any Security
authenticated and delivered under Section 3.7 in exchange for or in lieu of a
mutilated, destroyed, lost or stolen Security shall be deemed to evidence the
same debt as the mutilated, destroyed, lost or stolen Security.

     "Tax Event" means the receipt by an Issuer Trust of an Opinion of Counsel
(as defined in the

                                      -8-
<PAGE>
 
relevant Trust Agreement) experienced in such matters to the effect that, as a
result of any amendment to, or change (including any announced prospective
change) in, the laws (or any regulations thereunder) of the United States or any
political subdivision or taxing authority thereof or therein, or as a result of
any official administrative pronouncement or judicial decision interpreting or
applying such laws or regulations, which amendment or change is effective or
which pronouncement or decision is announced on or after the date of issuance of
the Preferred Securities of such Issuer Trust, there is more than an
insubstantial risk that (i) such Issuer Trust is, or will be within 90 days of
the date of such Opinion of Counsel, subject to United States federal income tax
with respect to income received or accrued on the corresponding series of
Securities issued by the Corporation to such Issuer Trust, (ii) interest payable
by the Corporation on such corresponding series of Securities is not, or within
90 days of the date of such Opinion of Counsel will not be, deductible by the
Corporation, in whole or in part, for United States federal income tax purposes,
or (iii) such Issuer Trust is, or will be within 90 days of the date of such
Opinion of Counsel, subject to more than a de minimis amount of other taxes,
duties or other governmental charges.

     "Trust Agreement" means, with respect to any Issuer Trust, the trust
agreement or other governing instrument of such Issuer Trust, as modified,
amended or supplemented from time to time.

     "Trustee" means the Person named as the "Trustee" in the first paragraph of
this instrument, solely in its capacity as such and not in its individual
capacity, until a successor Trustee shall have become such pursuant to the
applicable provisions of this Indenture, and thereafter "Trustee" shall mean or
include each Person who is then a Trustee hereunder and, if at any time there is
more than one such Person, "Trustee" as used with respect to the Securities of
any series shall mean the Trustee with respect to Securities of that series.

     "Trust Indenture Act" means the Trust Indenture Act of 1939 (15 U.S.C.
(S)(S) 77aaa-77bbb), as amended and as in effect on the date as of this
Indenture, except as provided in Section 9.5.

     "Trust Securities" has the meaning specified in the first recital of this
Indenture.

     "Vice President", when used with respect to the Corporation, means any duly
appointed vice president, whether or not designated by a number or a word or
words added before or after the title "vice president."

     Section 1.2. Compliance Certificate and Opinions.

     Upon any application or request by the Corporation to the Trustee to take
any action under any provision of this Indenture, the Corporation shall furnish
to the Trustee an Officers' Certificate stating that all conditions precedent
(including covenants compliance with which constitutes a condition precedent),
if any, provided for in this Indenture relating to the proposed action have been
complied with and an Opinion of Counsel stating that in the opinion of such
counsel all such conditions precedent (including covenants compliance with which
constitutes a condition precedent), if any, have been complied with, except that
in the case of any such application or request as to which the furnishing of
such documents is specifically required by any provision of this Indenture
relating to such particular application or request, no additional certificate or
opinion need be furnished.

     Every certificate or opinion with respect to compliance with a condition or
covenant provided

                                      -9-
<PAGE>
 
for in this Indenture (other than the certificates provided pursuant to Section
10.4) shall include:

     (1) a statement by each individual signing such certificate or opinion that
such individual has read such covenant or condition and the definitions herein
relating thereto;

     (2) a brief statement as to the nature and scope of the examination or
investigation upon which the statements or opinions of such individual contained
in such certificate or opinion are based;

     (3) a statement that, in the opinion of such individual, he or she has made
such examination or investigation as is necessary to enable him or her to
express an informed opinion as to whether or not such covenant or condition has
been complied with; and

     (4) a statement as to whether, in the opinion of such individual, such
condition or covenant has been complied with.

     Section 1.3. Forms of Documents Delivered to Trustee.

     In any case where several matters are required to be certified by, or
covered by an opinion of, any specified Person, it is not necessary that all
such matters be certified by, or covered by the opinion of, only one such
Person, or that they be so certified or covered by only one document, but one
such Person may certify or give an opinion with respect to some matters and one
or more other such Persons as to other matters, and any such Person may certify
or give an opinion as to such matters in one or several documents.

     Any certificate or opinion of an officer of the Corporation may be based,
insofar as it relates to legal matters, upon a certificate or opinion of, or
representations by, counsel, unless such officer knows, or in the exercise of
reasonable care should know, that the certificate or opinion or representations
with respect to matters upon which his or her certificate or opinion is based
are erroneous. Any such certificate or Opinion of Counsel may be based, insofar
as it relates to factual matters, upon a certificate or opinion of, or
representations by, an officer or officers of the Corporation stating that the
information with respect to such factual matters is in the possession of the
Corporation, unless such counsel knows, or in the exercise of reasonable care
should know, that the certificate or opinion or representations with respect to
such matters are erroneous.

     Where any Person is required to make, give or execute two or more
applications, requests, consents, certificates, statements, opinions or other
instruments under this Indenture, they may, but need not, be consolidated and
form one instrument.

     Section 1.4. Acts of Holders.

     (a) Any request, demand, authorization, direction, notice, consent, waiver
or other action provided by this Indenture to be given to or taken by Holders
may be embodied in and evidenced by one or more instruments of substantially
similar tenor signed by such Holders in person or by an agent duly appointed in
writing; and, except as herein otherwise expressly provided, such action shall
become effective when such instrument or instruments is or are delivered to the
Trustee and, where it is hereby expressly required, to the Corporation. Such
instrument or instruments (and the action embodied therein and evidenced
thereby) are herein sometimes referred to as the "Act" of the Holders

                                      -10-
<PAGE>
 
signing such instrument or instruments. Proof of execution of any such
instrument or of a writing appointing any such agent shall be sufficient for any
purpose of this Indenture and (subject to Section 6.1) conclusive in favor of
the Trustee and the Corporation, if made in the manner provided in this Section.

     (b) The fact and date of the execution by any Person of any such instrument
or writing may be proved by the affidavit of a witness of such execution or by
the certificate of any notary public or other officer authorized by law to take
acknowledgments of deeds, certifying that the individual signing such instrument
or writing acknowledged to him or her the execution thereof. Where such
execution is by a Person acting in other than his or her individual capacity,
such certificate or affidavit shall also constitute sufficient proof of his or
her authority.

     (c) The fact and date of the execution by any Person of any such instrument
or writing, or the authority of the Person executing the same, may also be
proved in any other manner that the Trustee deems sufficient and in accordance
with such reasonable rules as the Trustee may determine.

     (d) The ownership of Securities shall be proved by the Securities Register.

     (e) Any request, demand, authorization, direction, notice, consent, waiver
or other action by the Holder of any Security shall bind every future Holder of
the same Security and the Holder of every Security issued upon the transfer
thereof or in exchange therefor or in lieu thereof in respect of anything done
or suffered to be done by the Trustee or the Corporation in reliance thereon,
whether or not notation of such action is made upon such Security.

     (f) The Corporation may set any day as a record date for the purpose of
determining the Holders of Outstanding Securities of any series entitled to
give, make or take any request, demand, authorization, direction, notice,
consent, waiver or other action provided or permitted by this Indenture to be
given, made or taken by Holders of Securities of such series, provided that the
Corporation may not set a record date for, and the provisions of this paragraph
shall not apply with respect to, the giving or making of any notice,
declaration, request or direction referred to in the next succeeding paragraph.
If any record date is set pursuant to this paragraph, the Holders of Outstanding
Securities of the relevant series on such record date, and no other Holders,
shall be entitled to take the relevant action, whether or not such Holders
remain Holders after such record date, provided that no such action shall be
effective hereunder unless taken on or prior to the applicable Expiration Date
(as defined below) by Holders of the requisite principal amount of Outstanding
Securities of such series on such record date. Nothing in this paragraph shall
be construed to prevent the Corporation from setting a new record date for any
action for which a record date has previously been set pursuant to this
paragraph (whereupon the record date previously set shall automatically and with
no action by any Person be cancelled and of no effect), and nothing in this
paragraph shall be construed to render ineffective any action taken by Holders
of the requisite principal amount of Outstanding Securities of the relevant
series on the date such action is taken. Promptly after any record date is set
pursuant to this paragraph, the Corporation, at its own expense, shall cause
notice of such record date, the proposed action by Holders and the applicable
Expiration Date to be given to the Trustee in writing and to each Holder of
Securities of the relevant series in the manner set forth in Section 1.6.

     The Trustee may set any day as a record date for the purpose of determining
the Holders of Outstanding Securities of any series entitled to join in the
giving or making of (i) any Notice of

                                      -11-
<PAGE>
 
Default, (ii) any declaration of acceleration referred to in Section 5.2, (iii)
any request to institute proceedings referred to in Section 5.7(2), or (iv) any
direction referred to in Section 5.12, in each case with respect to Securities
of such series. If any record date is set pursuant to this paragraph, the
Holders of Outstanding Securities of such series on such record date, and no
other Holders, shall be entitled to join in such notice, declaration, request or
direction, whether or not such Holders remain Holders after such record date,
provided that no such action shall be effective hereunder unless taken on or
prior to the applicable Expiration Date by Holders of the requisite principal
amount of Outstanding Securities of such series on such record date. Nothing in
this paragraph shall be construed to prevent the Trustee from setting a new
record date for any action for which a record date has previously been set
pursuant to this paragraph (whereupon the record date previously set shall
automatically and with no action by any Person be cancelled and of no effect),
and nothing in this paragraph shall be construed to render ineffective any
action taken by Holders of the requisite principal amount of Outstanding
Securities of the relevant series on the date such action is taken. Promptly
after any record date is set pursuant to this paragraph, the Trustee, at the
Corporation's expense, shall cause notice of such record date, the proposed
action by Holders and the applicable Expiration Date to be given to the
Corporation in writing and to each Holder of Securities of the relevant series
in the manner set forth in Section 1.6.

     With respect to any record date set pursuant to this Section, the party
hereto that sets such record date may designate any day as the "Expiration Date"
and from time to time may change the Expiration Date to any earlier or later
day, provided that no such change shall be effective unless notice of the
proposed new Expiration Date is given to the other party hereto in writing, and
to each Holder of Securities of the relevant series in the manner set forth in
Section 1.6, on or prior to the existing Expiration Date. If an Expiration Date
is not designated with respect to any record date set pursuant to this Section,
the party hereto that set such record date shall be deemed to have initially
designated the 180th day after such record date as the Expiration Date with
respect thereto, subject to its right to change the Expiration Date as provided
in this paragraph. Notwithstanding the foregoing, no Expiration Date shall be
later than the 180th day after the applicable record date.

     (g) Without limiting the foregoing, a Holder entitled hereunder to take any
action hereunder with regard to any particular Security may do so with regard to
all or any part of the principal amount of such Security or by one or more duly
appointed agents each of which may do so pursuant to such appointment with
regard to all or any part of such principal amount.

     Section 1.5. Notices, Etc. to Trustee and Corporation.

     Any request, demand, authorization, direction, notice, consent, waiver or
Act of Holders or other document provided or permitted by this Indenture to be
made upon, given or furnished to, or filed with,

     (1) the Trustee by any Holder, any holder of Preferred Securities or the
Corporation shall be sufficient for every purpose hereunder if made, given,
furnished or filed in writing to or with the Trustee at its Corporate Trust
office, or

     (2) the Corporation by the Trustee, any Holder or any holder of Preferred
Securities shall be sufficient for every purpose (except as otherwise provided
in Section 5.1) hereunder if in writing and mailed, first class, postage
prepaid, to the Corporation addressed to it at the address of its principal

                                      -12-
<PAGE>
 
office specified in the first paragraph of this instrument or at any other
address previously furnished in writing to the Trustee by the Corporation.

     Section 1.6. Notice to Holders; Waiver.

     Where this Indenture provides for notice to Holders of any event, such
notice shall be sufficiently given (unless otherwise herein expressly provided)
if in writing and mailed, first class postage prepaid, to each Holder affected
by such event, at the address of such Holder as it appears in the Securities
Register, not later than the latest date, and not earlier than the earliest
date, prescribed for the giving of such notice. If, by reason of the suspension
of or irregularities in regular mail service or for any other reason, it shall
be impossible or impracticable to mail notice of any event to Holders when said
notice is required to be given pursuant to any provision of this Indenture or of
the relevant Securities, then any manner of giving such notice as shall be
satisfactory to the Trustee shall be deemed to be a sufficient giving of such
notice. In any case where notice to Holders is given by mail, neither the
failure to mail such notice, nor any defect in any notice so mailed, to any
particular Holder shall affect the sufficiency of such notice with respect to
other Holders. Where this Indenture provides for notice in any manner, such
notice may be waived in writing by the Person entitled to receive such notice,
either before or after the event, and such waiver shall be the equivalent of
such notice. Waivers of notice by Holders shall be filed with the Trustee, but
such filing shall not be a condition precedent to the validity of any action
taken in reliance upon such waiver.

     Section 1.7. Conflict with Trust Indenture Act.

     If any provision of this Indenture limits, qualifies or conflicts with the
duties imposed by any of Sections 310 to 317, inclusive, of the Trust Indenture
Act through operation of Section 318(c) thereof, such imposed duties shall
control. If any provision of this Indenture modifies or excludes any provision
of the Trust Indenture Act which may be so modified or excluded, the latter
provision shall be deemed to apply to this Indenture as so modified or to be
excluded, as the case may be.

     Section 1.8. Effect of Headings and Table of Contents.

     The Article and Section headings herein and the Table of Contents are for
convenience only and shall not affect the construction hereof.

     Section 1.9. Successors and Assigns.

     All covenants and agreements in this Indenture by the Corporation shall
bind its successors and assigns, whether so expressed or not.

     Section 1.10. Separability Clause.

     If any provision in this Indenture or in the Securities shall be invalid,
illegal or unenforceable, the validity, legality and enforceability of the
remaining provisions shall not in any way be affected or impaired thereby.

                                      -13-
<PAGE>
 
     Section 1.11. Benefits of Indenture.

     Nothing in this Indenture or in the Securities, express or implied, shall
give to any Person, other than the parties hereto and their successors and
assigns, the holders of Senior Indebtedness, the Holders of the Securities and,
to the extent expressly provided in Sections 5.2, 5.8, 5.9, 5.11, 5.13, 9.1 and
9.2, the holders of Preferred Securities, any benefit or any legal or equitable
right, remedy or claim under this Indenture.

     Section 1.12. Governing Law.

     THIS INDENTURE AND THE SECURITIES SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF ILLINOIS.

     Section 1.13. Non-Business Days.

     If any Interest Payment Date, Redemption Date or Stated Maturity of any
Security shall not be a Business Day, then (notwithstanding any other provision
of this Indenture or the Securities) payment of interest or principal (and
premium, if any) or other amounts in respect of such Security need not be made
on such date, but may be made on the next succeeding Business Day (and no
interest shall accrue in respect of the amounts whose payment is so delayed for
the period from and after such Interest Payment Date, Redemption Date or Stated
Maturity, as the case may be, until such next succeeding Business Day) except
that, if such Business Day falls in the next succeeding calendar year, such
payment shall be made on the immediately preceding Business Day (in each case
with the same force and effect as if made on the Interest Payment Date or
Redemption Date or at the Stated Maturity).


                                  ARTICLE II

                                Security Forms

     Section 2.1. Forms Generally.

     The Securities of each series and the Trustee's certificate of
authentication shall be in substantially the forms set forth in this Article, or
in such other form or forms as shall be established by or pursuant to a Board
Resolution or in one or more indentures supplemental hereto, in each case with
such appropriate insertions, omissions, substitutions and other variations as
are required or permitted by this Indenture and may have such letters, numbers
or other marks of identification and such legends or endorsements placed thereon
as may be required to comply with applicable tax laws or the rules of any
securities exchange or as may, consistently herewith, be determined by the
officers executing such securities, as evidenced by their execution of the
Securities. If the form of Securities of any series is established by action
taken pursuant to a Board Resolution, a copy of an appropriate record of such
action shall be certified by the Secretary or an Assistant Secretary of the
Corporation and delivered to the Trustee at or prior to the delivery of the
Corporation Order contemplated by Section 3.3 with respect to the authentication
and delivery of such Securities.

     The definitive Securities shall be printed, lithographed or engraved or
produced by any

                                      -14-
<PAGE>
 
combination of these methods, if required by any securities exchange on which
the Securities may be listed, on a steel engraved border or steel engraved
borders or may be produced in any other manner permitted by the rules of any
securities exchange on which the Securities may be listed, all as determined by
the officers executing such Securities, as evidenced by their execution of such
securities.

     Section 2.2. Form of Face of Security.

                          NORTHERN TRUST CORPORATION
                              [TITLE OF SECURITY]

No.              $

     NORTHERN TRUST CORPORATION, a corporation organized and existing under the
laws of Delaware (hereinafter called the "Corporation", which term includes any
successor Person under the Indenture hereinafter referred to), for value
received, hereby promises to pay to _______________, or registered assigns, the
principal sum of __________ Dollars on __________ __, [if the Security is a
Global Security, then insert, if applicable--, or such other principal amount
represented hereby as may be set forth in the records of the Securities
Registrar hereinafter referred to in accordance with the Indenture,] [; provided
that the Corporation may (i) shorten the Stated Maturity of the principal of
this Security to a date not earlier than __________, and (ii) extend the Stated
Maturity of the principal of this Security at any time on one or more occasions,
subject to certain conditions specified in Section 3.15 of the Indenture, but in
no event to a date later than __________]. The Corporation further promises to
pay interest on said principal sum from _______________, ___ or from the most
recent Interest Payment Date to which interest has been paid or duly provided
for, [monthly] [quarterly] [semi-annually] [if applicable, insert--(subject to
deferral as set forth herein)] in arrears on [insert applicable Interest Payment
Dates] of each year, commencing _______________, ___, at the rate of ___% per
annum, [if applicable insert--together with Additional Sums, if any, as provided
in Section 10.6 of the Indenture] until the principal hereof is paid or duly
provided for or made available for payment [if applicable, insert-- ; provided
that any overdue principal, premium or Additional Sums and any overdue
installment of interest shall bear Additional Interest at the rate of____% per
annum (to the extent that the payment of such interest shall be legally
enforceable), compounded [monthly] [quarterly] [semi-annually], from the dates
such amounts are due until they are paid or made available for payment, and such
interest shall be payable on demand]. The amount of interest payable for any
period less than a full interest period shall be computed on the basis of a 360-
day year of twelve 30-day months and the actual days elapsed in a partial month
in such period. The amount of interest payable for any full interest period
shall be computed by dividing the applicable rate per annum by
[twelve/four/two]. The interest so payable, and punctually paid or duly provided
for, on any Interest Payment Date will, as provided in the Indenture, be paid to
the Person in whose name this Security (or one or more Predecessor Securities)
is registered at the close of business on the Regular Record Date for such
interest installment [if applicable insert--, which shall be the [____________
or ____________] (whether or not a Business Day), as the case may be, next
preceding such Interest Payment Date]. Any such interest not so punctually paid
or duly provided for shall forthwith cease to be payable to the Holder on such
Regular Record Date and may either be paid to the Person in whose name this
Security (or one or more Predecessor Securities) is registered at the close of
business on a Special Record Date for the payment of such Defaulted Interest to
be fixed by the Trustee, notice whereof shall be given to

                                      -15-
<PAGE>
 
Holders of Securities of this series not less than 10 days prior to such Special
Record Date, or be paid at any time in any other lawful manner not inconsistent
with the requirements of any securities exchange on which the Securities of this
series may be listed, and upon such notice as may be required by such exchange,
all as more fully provided in said Indenture.

     [If applicable, insert--So long as no Event of Default has occurred and is
continuing, the Corporation shall have the right, at any time during the term of
this Security, from time to time to defer the payment of interest on this
Security for up to ______ consecutive [monthly] [quarterly] [semi-annual]
interest payment periods with respect to each deferral period (each an
"Extension Period") [If applicable, insert--, during which Extension Periods the
Corporation shall have the right to make partial payments of interest on any
Interest Payment Date, and] at the end of which the Corporation shall pay all
interest then accrued and unpaid including any Additional Interest, as provided
below; provided, however, that no Extension Period shall extend beyond the
Stated Maturity of the principal of this Security [If Stated Maturity can be
shortened or extended, insert--, as then in effect,] and no such Extension
Period may end on a date other than an Interest Payment Date; and provided,
further, however, that during any such Extension Period, the Corporation shall
not (i) declare or pay any dividends or distributions on, redeem, purchase or
acquire, or make a liquidation payment with respect to, any of the Corporation's
capital stock, or (ii) make any payment of principal of or interest or premium,
if any, on or repay, repurchase or redeem any debt securities of the Corporation
that rank pari passu in all respects with or junior in interest to this Security
(other than (a) repurchases, redemptions or other acquisitions of shares of
capital stock of the Corporation in connection with any employment contract,
benefit plan or other similar arrangement with or for the benefit of any one or
more employees, officers, directors or consultants, in connection with a
dividend reinvestment or stockholder stock purchase plan or in connection with
the issuance of capital stock of the Corporation (or securities convertible into
or exercisable for such capital stock) as consideration in an acquisition
transaction entered into prior to the applicable Extension Period, (b) as a
result of an exchange or conversion of any class or series of the Corporation's
capital stock (or any capital stock of a Subsidiary of the Corporation) for any
class or series of the Corporation's capital stock or of any class or series of
the Corporation's indebtedness for any class or series of the Corporation's
capital stock, (c) the purchase of fractional interests in shares of the
Corporation's capital stock pursuant to the conversion or exchange provisions of
such capital stock or the security being converted or exchanged, (d) any
declaration of a dividend in connection with any Rights Plan, or the issuance of
rights, stock or other property under any Rights Plan, or the redemption or
repurchase of rights pursuant thereto, or (e) any dividend in the form of stock,
warrants, options or other rights where the dividend stock or the stock issuable
upon exercise of such warrants, options or other rights is the same stock as
that on which the dividend is being paid or ranks pari passu with or junior to
such stock). Prior to the termination of any such Extension Period, the
Corporation may further defer the payment of interest, provided that no
Extension Period shall exceed ______ consecutive [monthly] [quarterly] [semi-
annual] interest payment periods, extend beyond the Stated Maturity of the
principal of this Security or end on a date other than an Interest Payment Date.
Upon the termination of any such Extension Period and upon the payment of all
accrued and unpaid interest and any Additional Interest then due on any Interest
Payment Date, the Corporation may elect to begin a new Extension Period, subject
to the above conditions. No interest shall be due and payable during an
Extension Period, except at the end thereof, but each installment of interest
that would otherwise have been due and payable during such Extension shall bear
Additional Interest (to the extent that the payment of such interest shall be
legally enforceable) at the rate of ____% per annum, compounded [monthly]
[quarterly] [semi-annually] and calculated as set forth in the first paragraph
of this Security, from the

                                      -16-
<PAGE>
 
dates on which amounts would otherwise have been due and payable until paid or
made available for payment. The Corporation shall give the Holder of this
Security and the Trustee notice of its election to begin any Extension Period at
least one Business Day prior to the next succeeding Interest Payment Date on
which interest on this Security would be payable but for such deferral [if
applicable, insert--or so long as such Securities are held by [insert name of
applicable Issuer Trust], at least one Business Day prior to the earlier of (i)
the next succeeding date on which Distributions on the Preferred Securities of
such Issuer Trust would be payable but for such deferral, and (ii) the date on
which the Property Trustee of such Issuer Trust is required to give notice to
any securities exchange or other applicable self-regulatory organization or to
holders of such Preferred Securities of the record date or the date such
Distributions are payable].

     Payment of the principal of (and premium, if any) and interest (including
any Additional Interest) on this Security will be made at the office or agency
of the Corporation maintained for that purpose in the [insert Place of Payment],
in such coin or currency of the United States of America as at the time of
payment is legal tender for payment of public and private debts [if applicable,
insert--; provided, however, that at the option of the Corporation payment of
interest may be made (i) by check mailed to the address of the Person entitled
thereto as such address shall appear in the Securities Register, or (ii) by wire
transfer in immediately available funds at such place and to such account as may
be designated by the Person entitled thereto as specified in the Securities
Register].

     The indebtedness evidenced by this Security is, to the extent provided in
the Indenture, subordinate and junior in right of payment to the prior payment
in full of all Senior Indebtedness, and this Security is issued subject to the
provisions of the Indenture with respect thereto. Each Holder of this Security,
by accepting the same, (a) agrees to and shall be bound by such provisions, (b)
authorizes and directs the Trustee on his or her behalf to take such actions as
may be necessary or appropriate to effectuate the subordination so provided, and
(c) appoints the Trustee his or her attorney-in-fact for any and all such
purposes. Each Holder hereof, by his or her acceptance hereof, waives all notice
of the acceptance of the subordination provisions contained herein and in the
Indenture by each holder of Senior Indebtedness, whether now outstanding or
hereafter incurred, and waives reliance by each such holder upon said
provisions.

     Reference is hereby made to the further provisions of this Security set
forth on the reverse hereof, which further provisions shall for all purposes
have the same effect as if set forth at this place.

     Unless the certificate of authentication hereon has been executed by the
Trustee referred to on the reverse hereof by manual signature, this Security
shall not be entitled to any benefit under the Indenture or be valid or
obligatory for any purpose.

     IN WITNESS WHEREOF, the Corporation has caused this instrument to be duly
executed

                                      -17-
<PAGE>
 
under its corporate seal.

                                        Northern Trust Corporation


                                        By: ____________________________
                                            Name:
                                            Title:

Attest:

____________________________________________
[Secretary or Assistant Secretary]

     Section 2.3. Form of Reverse of Security.

     This Security is one of a duly authorized issue of securities of the
Corporation (herein called the "Securities"), issued and to be issued in one or
more series under the Junior Subordinated Indenture, dated as of January __,
1997 (herein called the "Indenture"), between the Corporation and THE FIRST
NATIONAL BANK OF CHICAGO, as Trustee (herein called the "Trustee", which term
includes any successor trustee under the Indenture), to which Indenture and all
indentures supplemental thereto reference is hereby made for a statement of the
respective rights, limitations of rights, duties and immunities thereunder of
the Corporation, the Trustee, the holders of Senior Indebtedness and the Holders
of the Securities, and of the terms upon which the Securities are, and are to
be, authenticated and delivered. This Security is one of the series designated
on the face hereof [if applicable, insert--, limited in aggregate principal
amount to $ ___________].

     All terms used in this Security that are defined in the Indenture [if
applicable, insert--or in the Amended and Restated Trust Agreement, dated as of
___________, 199__ (as modified, amended or supplemented from time to time, the
"Trust Agreement"), relating to [insert name of Issuer Trust] (the "Issuer
Trust") among the Corporation, as Depositor, the Trustees named therein and the
Holders from time to time of the Trust Securities issued pursuant thereto, shall
have the meanings assigned to them in the Indenture [if applicable, insert--or
the Trust Agreement, as the case may be].

     [If applicable, insert--The Corporation may at any time, at its option, on
or after _________, ____, and subject to the terms and conditions of Article XI
of the Indenture, redeem this Security in whole at any time or in part from time
to time, at the following Redemption Prices (expressed as per centages of the
principal amount hereof): If redeemed during the 12-month period beginning
_____________,

                                      -18-
<PAGE>
 
                              Year           Redemption
                              ----             Price
                                             ----------
 
 
 
and thereafter at a Redemption Price equal to 100% of the principal amount
hereof, together, in the case of any such redemption, with accrued interest [if
applicable, insert--, including any Additional Interest,] to but excluding the
date fixed for redemption.]

     [If applicable, insert--In addition, upon the occurrence and during the
continuation of a Tax Event or a Capital Treatment Event in respect of the
Issuer Trust, the Corporation may, at its option, at any time within 90 days of
the occurrence and during the continuation of such Tax Event or Capital
Treatment Event, as the case may be, redeem this Security, in whole but not in
part, subject to the terms and conditions of Article XI of the Indenture, at a
redemption price equal to [insert formula].]

     [If the Security is subject to redemption of any kind, insert--In the event
of redemption of this Security in part only, a new Security or Securities of
this series for the unredeemed portion hereof will be issued in the name of the
Holder hereof upon the cancellation hereof.]

     The Indenture contains provisions for satisfaction and discharge of the
entire indebtedness of this Security upon compliance by the Corporation with
certain conditions set forth in the Indenture.

     The Indenture permits, with certain exceptions as therein provided, the
Corporation and the Trustee at any time to enter into a supplemental indenture
or indentures for the purpose of modifying in any manner the rights and
obligations of the Corporation and of the Holders of the Securities, with the
consent of the Holders of not less than a majority in principal amount of the
Outstanding Securities of each series to be affected by such supplemental
indenture. The Indenture also contains provisions permitting Holders of
specified percentages in principal amount of the Securities of each series at
the time Outstanding, on behalf of the Holders of all Securities of such series,
to waive compliance by the Corporation with certain provisions of the Indenture
and certain past defaults under the Indenture and their consequences. Any such
consent or waiver by the Holder of this Security shall be conclusive and binding
upon such Holder and upon all future Holders of this Security and of any
Security issued upon the registration of transfer hereof or in exchange herefor
or in lieu hereof, whether or not notation of such consent or waiver is made
upon this Security.

     [If the Security is not a Discount Security, insert--As provided in and
subject to the provisions of the Indenture, if an Event of Default with respect
to the Securities of this series at the time Outstanding occurs and is
continuing, then and in every such case the Trustee or the Holders of not less
than 25% in aggregate principal amount of the Outstanding Securities of this
series may declare the principal amount of all the Securities of this series to
be due and payable immediately, by a notice in writing to the Corporation (and
to the Trustee if given by Holders) [if applicable, insert--, provided that, if
upon an Event of Default the Trustee or such Holders fail to declare the
principal of all the Outstanding Securities of this series to be immediately due
and payable, the holders of at least 25% in aggregate Liquidation Amount of the
Preferred Securities then Outstanding shall have the

                                      -19-
<PAGE>
 
right to make such declaration by a notice in writing to the Corporation and the
Trustee]; and upon any such declaration the principal amount of and the accrued
interest (including any Additional Interest) on all the Securities of this
series shall become immediately due and payable, provided that the payment of
principal and interest (including any Additional Interest) on such Securities
shall remain subordinated to the extent provided in Article XIII of the
Indenture.]

     [If the Security is a Discount Security, insert--As provided in and subject
to the provisions of the Indenture, if an Event of Default with respect to the
Securities of this series at the time Outstanding occurs and is continuing, then
and in every such case the Trustee or the Holders of not less than 25% in
aggregate principal amount of the Outstanding Securities of this series may
declare an amount of principal of the Securities of this series to be due and
payable immediately, by a notice in writing to the Corporation (and to the
Trustee if given by Holders) [if applicable, insert--, provided that, if upon an
Event of Default, the Trustee or such Holders fail to declare such principal
amount of the Outstanding Securities of this series to be immediately due and
payable, the holders of at least 25% in aggregate Liquidation Amount of the
Preferred Securities then Outstanding shall have the right to make such
declaration by a notice in writing to the Corporation and the Trustee]. The
principal amount payable upon such acceleration shall be equal to--insert
formula for determining the amount]. Upon any such declaration, such amount of
the principal of and the accrued interest  (including any Additional Interest)
on all the Securities of this series shall become immediately due and payable,
provided that the payment of such principal and interest (including any
Additional Interest) on all the Securities of this series shall remain
subordinated to the extent provided in Article XIII of the Indenture. Upon
payment (i) of the amount of principal so declared due and payable and (ii) of
interest on any overdue principal, premium and interest (in each case to the
extent that the payment of such interest shall be legally enforceable), all of
the Corporation's obligations in respect of the payment of the principal of and
premium and interest, if any, on this Security shall terminate.]

     No reference herein to the Indenture and no provision of this Security or
of the Indenture shall alter or impair the obligation of the Corporation, which
is absolute and unconditional, to pay the principal of (and premium, if any) and
interest [insert if applicable--including any Additional Interest)] on this
Security at the times, place and rate, and in the coin or currency, herein
prescribed.

     As provided in the Indenture and subject to certain limitations therein set
forth, the transfer of this Security is registrable in the Securities Register,
upon surrender of this Security for registration of transfer at the office or
agency of the Corporation maintained under Section 10.2 of the Indenture for
such purpose, duly endorsed by, or accompanied by a written instrument of
transfer in form satisfactory to the Corporation and the Securities Registrar
duly executed by, the Holder hereof or such Holder's attorney duly authorized in
writing, and thereupon one or more new Securities of this series, of like tenor,
of authorized denominations and for the same aggregate principal amount, will be
issued to the designated transferee or transferees.

     The Securities of this series are issuable only in registered form without
coupons in denominations of $____________ and any integral multiple of
$____________ in excess thereof. As provided in the Indenture and subject to
certain limitations therein set forth, Securities of this series are
exchangeable for a like aggregate principal amount of Securities of this series
and of like tenor of a different authorized denomination, as requested by the
Holder surrendering the same.

     No service charge shall be made for any such registration of transfer or
exchange, but the

                                      -20-
<PAGE>
 
Corporation may require payment of a sum sufficient to cover any tax or other
governmental charge payable in connection therewith.

     Prior to due presentment of this Security for registration of transfer, the
Corporation, the Trustee and any agent of the Corporation or the Trustee may
treat the Person in whose name this Security is registered as the owner hereof
for all purposes, whether or not this Security be overdue, and neither the
Corporation, the Trustee nor any such agent shall be affected by notice to the
contrary.

     The Corporation and, by its acceptance of this Security or a beneficial
interest therein, the Holder of, and any Person that acquires a beneficial
interest in, this Security agree that for United States federal, state and local
tax purposes it is intended that this Security constitute indebtedness.

     THIS SECURITY SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE
LAWS OF THE STATE OF ILLINOIS.

     Section 2.4. Additional Provisions Required in Global Security.

     Unless otherwise specified as contemplated by Section 3.1, any Global
Security issued hereunder shall, in addition to the provisions contained in
Sections 2.2 and 2.3, bear a legend in substantially the following form:

     THIS SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE
     HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITARY OR A
     NOMINEE OF A DEPOSITARY. THIS SECURITY IS EXCHANGEABLE FOR SECURITIES
     REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITARY OR ITS NOMINEE
     ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE AND MAY NOT BE
     TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE
     DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR ANOTHER
     NOMINEE OF THE DEPOSITARY, EXCEPT IN THE LIMITED CIRCUMSTANCES DESCRIBED IN
     THE INDENTURE.

     Section 2.5. Form of Trustee's Certificate of Authentication.

     The Trustee's certificates of authentication shall be in substantially the
following form:

     This is one of the Securities of the series designated therein referred to
in the within-mentioned Indenture.

Dated:
 
                                        The First National Bank of Chicago,
                                        as Trustee

                                        By:________________________________
                                             Authorized officer

                                      -21-
<PAGE>
 
                                  ARTICLE III

                                The Securities

     Section 3.1. Title and Terms.

     The aggregate principal amount of Securities that may be authenticated and
delivered under this Indenture is unlimited.

     The Securities may be issued in one or more series. There shall be
established in or pursuant to a Board Resolution and, subject to Section 3.3,
set forth or determined in the manner provided in an Officers' Certificate, or
established in one or more indentures supplemental hereto, prior to the issuance
of Securities of a series:

          (a) the title of the securities of such series, which shall
     distinguish the Securities of the series from all other Securities;

          (b) the limit, if any, upon the aggregate principal amount of the
     Securities of such series that may be authenticated and delivered under
     this Indenture (except for Securities authenticated and delivered upon
     registration of transfer of, or in exchange for, or in lieu of, other
     Securities of the series pursuant to Section 3.4, 3.6, 3.7, 9.6 or 11.6 and
     except for any Securities that, pursuant to Section 3.3, are deemed never
     to have been authenticated and delivered hereunder); provided, however,
     that the authorized aggregate principal amount of such series may be
     increased above such amount by a Board Resolution to such effect;

          (c) the Person to whom any interest on a Security of the series shall
     be payable, if other than the Person in whose name that security (or one or
     more Predecessor Securities) is registered at the close of business on the
     Regular Record Date for such interest;

          (d) the Stated Maturity or Maturities on which the principal of the
     Securities of such series is payable or the method of determination
     thereof, and any dates on which or circumstances under which, the
     Corporation shall have the right to extend or shorten such Stated Maturity
     or Maturities;

          (e) the rate or rates, if any, at which the Securities of such series
     shall bear interest, if any, the rate or rates and extent to which
     Additional Interest, if any, shall be payable in respect of any Securities
     of such series, the date or dates from which any such interest or
     Additional Interest shall accrue, the Interest Payment Dates on which such
     interest shall be payable, the right, pursuant to Section 3.12 or as
     otherwise set forth therein, of the Corporation to defer or extend an
     Interest Payment Date, and the Regular Record Date for the interest payable
     on any Interest Payment Date or the method by which any of the foregoing
     shall be determined;

          (f) the place or places where the principal of (and premium, if any)
     and interest (including any Additional Interest) on the Securities of such
     series shall be payable, the place or places where the Securities of such
     series may be presented for registration of transfer or exchange, any
     restrictions that may be applicable to any such transfer or exchange in
     addition

                                      -22-
<PAGE>
 
     to or in lieu of those set forth herein, and the place or places where
     notices and demands to or upon the Corporation in respect of the Securities
     of such series may be made;

          (g) the period or periods within or the date or dates on which, if
     any, the price or prices at which and the terms and conditions upon which
     the Securities of such series may be redeemed, in whole or in part, at the
     option of the Corporation, and if other than by a Board Resolution, the
     manner in which any election by the Corporation to redeem such Securities
     shall be evidenced;

          (h) the obligation or the right, if any, of the Corporation to redeem,
     repay or purchase the Securities of such series pursuant to any sinking
     fund, amortization or analogous provisions, or at the option of a Holder
     thereof, and the period or periods within which, the price or prices at
     which, the currency or currencies (including currency unit or units) in
     which and the other terms and conditions upon which Securities of the
     series shall be redeemed, repaid or purchased, in whole or in part,
     pursuant to such obligation;

          (i) the denominations in which any Securities of such series shall be
     issuable, if other than denominations of $25 and any integral multiple
     thereof;

          (j) if other than Dollars, the currency or currencies (including any
     currency unit or units) in which the principal of (and premium, if any) and
     interest (including any Additional Interest) on the Securities of the
     series shall be payable, or in which the Securities of the series shall be
     denominated and the manner of determining the equivalent thereof in Dollars
     for purposes of the definition of Outstanding;

          (k) the additions, modifications or deletions, if any, in the Events
     of Default or covenants of the Corporation set forth herein with respect to
     the Securities of such series;

          (l) if other than the principal amount thereof, the portion of the
     principal amount of Securities of such series that shall be payable upon
     declaration of acceleration of the Maturity thereof;

          (m) if the principal amount payable at the Stated Maturity of any
     Securities of the series will not be determinable as of any one or more
     dates prior to the Stated Maturity, the amount which shall be deemed to be
     the principal amount of such Securities as of any such date for any purpose
     thereunder or hereunder, including the principal amount thereof which shall
     be due and payable upon any Maturity other than the Stated Maturity or
     which shall be deemed to be Outstanding as of any date prior to the Stated
     Maturity (or, in any such case, the manner in which such amount deemed to
     be the principal amount shall be determined);

          (n) the additions or changes, if any, to this Indenture with respect
     to the Securities of such series as shall be necessary to permit or
     facilitate the issuance of the Securities of such series in bearer form,
     registrable or not registrable as to principal, and with or without
     interest coupons;

          (o) any index or indices used to determine the amount of payments of
     principal of and premium, if any, on the Securities of such series or the
     manner in which such amounts will be

                                      -23-
<PAGE>
 
     determined;

          (p) if applicable, that any Securities of the series shall be issuable
     in whole or in part in the form of one or more Global Securities and, in
     such case, the respective Depositaries for such Global Securities, the form
     of any legend or legends that shall be borne by any such Global Security in
     addition to or in lieu of that set forth in Section 2.4 and any
     circumstances in addition to or in lieu of those set forth in Section 3.5
     in which any such Global Security may be exchanged in whole or in part for
     Securities registered, and any transfer of such Global Security in whole or
     in part may be registered, in the name or names of Persons other than the
     Depositary for such Global Security or a nominee thereof;

          (q) the appointment of any Paying Agent or agents for the Securities
     of such series;

          (r) the terms of any right to convert or exchange Securities of such
     series into any other securities or property of the Corporation, and the
     additions or changes, if any, to this Indenture with respect to the
     Securities of such series to permit or facilitate such conversion or
     exchange;

          (s) if such Securities are to be issued to an Issuer Trust, the form
     or forms of the Trust Agreement, Guarantee Agreement and Expense Agreement
     (as defined in the related Trust Agreement) relating thereto;

          (t) if other than as set forth herein, the relative degree, if any, to
     which the Securities of the series shall be senior to or be subordinated to
     other series of Securities in right of payment, whether such other series
     of Securities are Outstanding or not;

          (u) any change in the right of the Trustee or the requisite Holders of
     such Securities to declare the principal amount thereof due and payable
     pursuant to Section 5.2; and

          (v) any other terms of the Securities of such series (which terms
     shall not be inconsistent with the provisions of this Indenture, except as
     permitted by Section 9.1(6)).

     All Securities of any one series shall be substantially identical except as
to denomination and except as may otherwise be provided herein or in or pursuant
to such Board Resolution and set forth, or determined in the manner provided, in
such Officers' Certificate or in any indenture supplemental hereto.

     If any of the terms of the series are established by action taken pursuant
to a Board Resolution, a copy of an appropriate record of such action shall be
certified by the Secretary or an Assistant Secretary of the Corporation and
delivered to the Trustee at or prior to the delivery of the Officers'
Certificate setting forth the terms of the series.

     The Securities shall be subordinated in right of payment to Senior
Indebtedness as provided in Article XIII.

                                      -24-
<PAGE>
 
     Section 3.2. Denominations.

     The Securities of each series shall be in registered form without coupons
and shall be issuable in denominations of $25 and any integral multiple thereof,
unless otherwise specified as contemplated by Section 3.1.

     Section 3.3. Execution, Authentication, Delivery and Dating.

     The Securities shall be executed on behalf of the Corporation by its
Chairman of the Board, its Vice Chairman of the Board, its President or one of
its Vice Presidents, under its corporate seal reproduced or impressed thereon
and attested by its Secretary or one of its Assistant Secretaries. The signature
of any of these officers on the Securities may be manual or facsimile.

     Securities bearing the manual or facsimile signatures of individuals who
were at any time the proper officers of the Corporation shall bind the
Corporation, notwithstanding that such individuals or any of them have ceased to
hold such offices prior to the authentication and delivery of such Securities or
did not hold such offices at the date of such Securities. At any time and from
time to time after the execution and delivery of this Indenture, the Corporation
may deliver Securities of any series executed by the Corporation to the Trustee
for authentication, together with a Corporation Order for the authentication and
delivery of such Securities, and the Trustee in accordance with the Corporation
Order shall authenticate and deliver such Securities. If the form or terms of
the Securities of the series have been established by or pursuant to one or more
Board Resolutions as permitted by Sections 2.1 and 3.1, in authenticating such
Securities, and accepting the additional responsibilities under this Indenture
in relation to such Securities, the Trustee shall be entitled to receive, and
(subject to Section 6.1) shall be fully protected in relying upon, an Opinion of
Counsel stating,

          (1) if the form of such Securities has been established by or pursuant
     to Board Resolution as permitted by Section 2.1, that such form has been
     established in conformity with the provisions of this Indenture;

          (2) if the terms of such Securities have been established by or
     pursuant to Board Resolution as permitted by Section 3.1, that such terms
     have been established in conformity with the provisions of this Indenture;
     and

          (3) that such Securities, when authenticated and delivered by the
     Trustee and issued by the Corporation in the manner and subject to any
     conditions specified in such Opinion of Counsel, will constitute valid and
     legally binding obligations of the Corporation, subject to bankruptcy,
     insolvency, fraudulent transfer, reorganization, moratorium and similar
     laws of general applicability relating to or affecting creditors' rights
     and to general equity principles.

If such form or terms have been so established, the Trustee shall not be
required to authenticate such Securities if the issue of such Securities
pursuant to this Indenture will affect the Trustee's own rights, duties or
immunities under the Securities and this Indenture or otherwise in a manner that
is not reasonably acceptable to the Trustee.

     Notwithstanding the provisions of Section 3.1 and of the preceding
paragraph, if all Securities of a series are not to be originally issued at one
time, it shall not be necessary to deliver the Officers'

                                      -25-
<PAGE>
 
Certificate otherwise required pursuant to Section 3.1 or the Corporation Order
and Opinion of Counsel otherwise required pursuant to such preceding paragraph
at or prior to the authentication of each Security of such series if such
documents are delivered at or prior to the authentication upon original issuance
of the first Security of such series to be issued.

     Each Security shall be dated the date of its authentication.

     No Security shall be entitled to any benefit under this Indenture or be
valid or obligatory for any purpose, unless there appears on such Security a
certificate of authentication substantially in the form provided for herein
executed by the Trustee by the manual signature of one of its authorized
officers, and such certificate upon any Security shall be conclusive evidence,
and the only evidence, that such Security has been duly authenticated and
delivered hereunder. Notwithstanding the foregoing, if any Security shall have
been authenticated and delivered hereunder but never issued and sold by the
Corporation, and the Corporation shall deliver such Security to the Trustee for
can cellation as provided in Section 3.10, for all purposes of this Indenture
such Security shall be deemed never to have been authenticated and delivered
hereunder and shall never be entitled to the benefits of this Indenture.

     Section 3.4. Temporary Securities.

     Pending the preparation of definitive Securities of any series, the
Corporation may execute, and upon receipt of a Corporation Order the Trustee
shall authenticate and deliver, temporary Securities that are printed,
lithographed, typewritten, mimeographed or otherwise produced, in any
denomination, substantially of the tenor of the definitive Securities of such
series in lieu of which they are issued and with such appropriate insertions,
omissions, substitutions and other variations as the officers executing such
Securities may determine, as evidenced by their execution of such Securities.

     If temporary Securities of any series are issued, the Corporation will
cause definitive Securities of such series to be prepared without unreasonable
delay. After the preparation of definitive Securities, the temporary Securities
shall be exchangeable for definitive Securities upon surrender of the temporary
Securities at the office or agency of the Corporation designated for that
purpose without charge to the Holder. Upon surrender for cancellation of any one
or more temporary Securities, the Corporation shall execute and the Trustee
shall authenticate and deliver in exchange therefor one or more definitive
Securities of the same series, of any authorized denominations having the same
Original Issue Date and Stated Maturity and having the same terms as such
temporary Securities. Until so exchanged, the temporary Securities of any series
shall in all respects be entitled to the same benefits under this Indenture as
definitive Securities of such series.


     Section 3.5. Global Securities.

     (a) Each Global Security issued under this Indenture shall be registered in
the name of the Depositary designated by the Corporation for such Global
Security or a nominee thereof and delivered to such Depositary or a nominee
thereof or custodian therefor, and each such Global Security shall constitute a
single Security for all purposes of this Indenture.

     (b) Notwithstanding any other provision in this Indenture, no Global
Security may be

                                      -26-
<PAGE>
 
exchanged in whole or in part for Securities registered, and no transfer of a
Global Security in whole or in part may be registered, in the name of any Person
other than the Depositary for such Global Security or a nominee thereof unless
(i) such Depositary advises the Trustee in writing that such Depositary is no
longer willing or able to properly discharge its responsibilities as Depositary
with respect to such Global Security, and the Corporation is unable to locate a
qualified successor, (ii) the Corporation executes and delivers to the Trustee a
Corporation Order stating that the Corporation elects to terminate the book-
entry system through the Depositary, or (iii) there shall have occurred and be
continuing an Event of Default.

     (c) If any Global Security is to be exchanged for other Securities or
cancelled in whole, it shall be surrendered by or on behalf of the Depositary or
its nominee to the Securities Registrar for exchange or cancellation as provided
in this Article III.  If any Global Security is to be exchanged for other
Securities or cancelled in part, or if another Security is to be exchanged in
whole or in part for a beneficial interest in any Global Security, then either
(i) such Global Security shall be so surrendered for exchange or cancellation as
provided in this Article III or (ii) the principal amount thereof shall be
reduced or increased by an amount equal to the portion thereof to be so
exchanged or cancelled, or equal to the principal amount of such other Security
to be so exchanged for a beneficial interest therein, as the case may be, by
means of an appropriate adjustment made on the records of the Securities
Registrar, whereupon the Trustee, in accordance with the Applicable Procedures,
shall instruct the Depositary or its authorized representative to make a
corresponding adjustment to its records. Upon any such surrender or adjustment
of a Global Security by the Depositary, accompanied by registration
instructions, the Trustee shall, subject to Section 3.5(b) and as otherwise
provided in this Article III, authenticate and deliver any Securities issuable
in exchange for such Global Security (or any portion thereof) in accordance with
the instructions of the Depositary. The Trustee shall not be liable for any
delay in delivery of such instructions and may conclusively rely on, and shall
be fully protected in relying on, such instructions.

     (d) Every Security authenticated and delivered upon registration of
transfer of, or in exchange for or in lieu of, a Global Security or any portion
thereof, whether pursuant to this Article III, Section 9.6 or 11.6 or otherwise,
shall be authenticated and delivered in the form of, and shall be, a Global
Security, unless such Security is registered in the name of a Person other than
the Depositary for such Global Security or a nominee thereof.

     (e) Securities distributed to holders of Book-Entry Preferred Securities
(as defined in the applicable Trust Agreement) upon the dissolution of an Issuer
Trust shall be distributed in the form of one or more Global Securities
registered in the name of a Depositary or its nominee, and deposited with the
Securities Registrar, as custodian for such Depositary, or with such Depositary,
for credit by the Depositary to the respective accounts of the beneficial owners
of the Securities represented thereby (or such other accounts as they may
direct).  Securities distributed to holders of Preferred Securities other than
Book-Entry Preferred Securities upon the dissolution of an Issuer Trust shall
not be issued in the form of a Global Security or any other form intended to
facilitate book-entry trading in beneficial interests in such Securities.

     (f) The Depositary or its nominee, as the registered owner of a Global
Security, shall be the Holder of such Global Security for all purposes under
this Indenture and the Securities, and owners of beneficial interests in a
Global Security shall hold such interests pursuant to the Applicable Procedures.
Accordingly, any such owner's beneficial interest in a Global Security shall be
shown

                                      -27-
<PAGE>
 
only on, and the transfer of such interest shall be effected only through,
records maintained by the Depositary or its nominee or its Agent Members.
Neither the Trustee nor the Securities Registrar shall have any liability in
respect of any transfers effected by the Depositary.

     (g) The rights of owners of beneficial interests in a Global Security shall
be exercised only through the Depositary and shall be limited to those
established by law and agreements between such owners and the Depositary and/or
its Agent Members.

     Section 3.6. Registration, Transfer and Exchange Generally.

     The Corporation shall cause to be kept at the Corporate Trust Office of the
Trustee a register in which, subject to such reasonable regulations as it may
prescribe, the Corporation shall provide for the registration of Securities and
of transfers of Securities. Such register is herein sometimes referred to as the
"Securities Register." The Trustee is hereby appointed "Securities Registrar"
for the purpose of registering Securities and transfers of Securities as herein
provided.

     Upon surrender for registration of transfer of any Security at the offices
or agencies of the Corporation designated for that purpose the Corporation shall
execute, and the Trustee shall authenticate and deliver, in the name of the
designated transferee or transferees, one or more new Securities of the same
series of any authorized denominations of like tenor and aggregate principal
amount.

     At the option of the Holder, Securities may be exchanged for other
Securities of the same series of any authorized denominations, of like tenor and
aggregate principal amount, upon surrender of the Securities to be exchanged at
such office or agency. Whenever any securities are so surrendered for exchange,
the Corporation shall execute, and the Trustee shall authenticate and deliver,
the Securities that the Holder making the exchange is entitled to receive.

     All Securities issued upon any transfer or exchange of Securities shall be
the valid obligations of the Corporation, evidencing the same debt, and entitled
to the same benefits under this Indenture, as the Securities surrendered upon
such transfer or exchange.

     Every Security presented or surrendered for transfer or exchange shall (if
so required by the Corporation or the Trustee) be duly endorsed, or be
accompanied by a written instrument of transfer in form satisfactory to the
Corporation and the Securities Registrar, duly executed by the Holder thereof or
such Holder's attorney duly authorized in writing.

     No service charge shall be made to a Holder for any transfer or exchange of
Securities, but the Corporation may require payment of a sum sufficient to cover
any tax or other governmental charge that may be imposed in connection with any
transfer or exchange of Securities.

     Neither the Corporation nor the Trustee shall be required, pursuant to the
provisions of this Section, (i) to issue, register the transfer of or exchange
any Security of any series during a period beginning at the opening of business
15 days before the day of selection for redemption of Securities of that series
pursuant to Article XI and ending at the close of business on the day of mailing
of the notice of redemption, or (ii) to register the transfer of or exchange any
Security so selected for redemption in whole or in part, except, in the case of
any such Security to be redeemed in part, any

                                      -28-
<PAGE>
 
portion thereof not to be redeemed.

     Section 3.7. Mutilated, Destroyed, Lost and Stolen Securities.

     If any mutilated Security is surrendered to the Trustee together with such
security or indemnity as may be required by the Corporation or the Trustee to
save each of them harmless, the Corporation shall execute and the Trustee shall
authenticate and deliver in exchange therefor a new Security of the same series,
of like tenor and aggregate principal amount, and bearing a number not
contemporaneously outstanding.

     If there shall be delivered to the Corporation and to the Trustee (i)
evidence to their satisfaction of the destruction, loss or theft of any
Security, and (ii) such security or indemnity as may be required by them to save
each of them harmless, then, in the absence of notice to the Corporation or the
Trustee that such Security has been acquired by a bona fide purchaser, the
Corporation shall execute and upon its request the Trustee shall authenticate
and deliver, in lieu of any such destroyed, lost or stolen Security, a new
Security of the same series, of like tenor and aggregate principal amount as
such destroyed, lost or stolen Security, and bearing a number not
contemporaneously outstanding.

     If any such mutilated, destroyed, lost or stolen Security has become or is
about to become due and payable, the Corporation in its discretion may, instead
of issuing a new Security, pay such Security.

     Upon the issuance of any new Security under this Section, the Corporation
may require the payment of a sum sufficient to cover any tax or other
governmental charge that may be imposed in relation thereto and any other
expenses (including the fees and expenses of the Trustee) connected therewith.

     Every new Security issued pursuant to this Section in lieu of any
destroyed, lost or stolen Security shall constitute an original additional
contractual obligation of the Corporation, whether or not the destroyed, lost or
stolen Security shall be at any time enforceable by anyone, and shall be
entitled to all the benefits of this Indenture equally and proportionately with
any and all other Securities of the same series duly issued hereunder.

     The provisions of this Section are exclusive and shall preclude (to the
extent lawful) all other rights and remedies with respect to the replacement or
payment of mutilated, destroyed, lost or stolen Securities.

     Section 3.8. Payment of Interest and Additional Interest; Interest Rights
Preserved.

     Interest and Additional Interest on any Security of any series that is
payable, and is punctually paid or duly provided for, on any Interest Payment
Date, shall be paid to the Person in whose name that Security (or one or more
Predecessor Securities) is registered at the close of business on the Regular
Record Date for such interest in respect of Securities of such series, except
that, unless otherwise provided in the Securities of such series, interest and
any Additional Interest payable on the Stated Maturity of the principal of a
Security shall be paid to the Person to whom principal is paid. The initial
payment of interest on any Security of any series that is issued between a
Regular Record

                                      -29-
<PAGE>
 
Date and the related Interest Payment Date shall be payable as provided in such
Security or in the Board Resolution pursuant to Section 3.1 with respect to the
related series of Securities.

     Any interest on any Security that is due and payable, but is not timely
paid or duly provided for, on any Interest Payment Date for Securities of such
series (herein called "Defaulted Interest"), shall forthwith cease to be payable
to the registered Holder on the relevant Regular Record Date by virtue of having
been such Holder, and such Defaulted Interest may be paid by the Corporation, at
its election in each case, as provided in Clause (1) or (2) below:

     (1) The Corporation may elect to make payment of any Defaulted Interest to
the Persons in whose names the Securities of such series in respect of which
interest is in default (or their respective Predecessor Securities) are
registered at the close of business on a Special Record Date for the payment of
such Defaulted Interest, which shall be fixed in the following manner. The
Corporation shall notify the Trustee in writing of the amount of Defaulted
Interest proposed to be paid on each Security and the date of the proposed
payment, and at the same time the Corporation shall deposit with the Trustee an
amount of money equal to the aggregate amount proposed to be paid in respect of
such Defaulted Interest or shall make arrangements satisfactory to the Trustee
for such deposit prior to the date of the proposed payment, such money when
deposited to be held in trust for the benefit of the Persons entitled to such
Defaulted Interest as in this Clause provided. Thereupon the Trustee shall fix a
Special Record Date for the payment of such Defaulted Interest, which shall be
not more than 15 days and not less than 10 days prior to the date of the
proposed payment and not less than 10 days after the receipt by the Trustee of
the notice of the proposed payment. The Trustee shall promptly notify the
Corporation of such Special Record Date and, in the name and at the expense of
the Corporation, shall cause notice of the proposed payment of such Defaulted
Interest and the Special Record Date therefor to be mailed, first class, postage
prepaid, to each Holder of a Security of such series at the address of such
Holder as it appears in the Securities Register not less than 10 days prior to
such Special Record Date. The Trustee may, in its discretion, in the name and at
the expense of the Corporation, cause a similar notice to be published at least
once in a newspaper, customarily published in the English language on each
Business Day and of general circulation in the Borough of Manhattan, The City of
New York, but such publication shall not be a condition precedent to the
establishment of such Special Record Date. Notice of the proposed payment of
such Defaulted Interest and the Special Record Date therefor having been mailed
as aforesaid, such Defaulted Interest shall be paid to the Persons in whose
names the Securities of such series (or their respective Predecessor Securities)
are registered on such Special Record Date and shall no longer be payable
pursuant to the following Clause (2).

     (2) The Corporation may make payment of any Defaulted Interest in any other
lawful manner not inconsistent with the requirements of any securities exchange
on which the Securities of the series in respect of which interest is in default
may be listed and, upon such notice as may be required by such exchange (or by
the Trustee if the Securities are not listed), if, after notice given by the
Corporation to the Trustee of the proposed payment pursuant to this Clause, such
payment shall be deemed practicable by the Trustee.

     Subject to the foregoing provisions of this Section, each Security
delivered under this Indenture upon transfer of or in exchange for or in lieu of
any other Security shall carry the rights to interest accrued and unpaid, and to
accrue, that were carried by such other Security.

                                      -30-
<PAGE>
 
     Section 3.9. Persons Deemed Owners.

     The Corporation, the Trustee and any agent of the Corporation or the
Trustee shall treat the Person in whose name any Security is registered as the
owner of such Security for the purpose of receiving payment of principal of and
(subject to Sections 3.8 and 3.12) any interest on such Security and for all
other purposes whatsoever, whether or not such Security be overdue, and neither
the Corporation, the Trustee nor any agent of the Corporation or the Trustee
shall be affected by notice to the contrary.

     No holder of any beneficial interest in any Global Security held on its
behalf by a Depositary shall have any rights under this Indenture with respect
to such Global Security, and such Depositary may be treated by the Corporation,
the Trustee and any agent of the Corporation or the Trustee as the owner of such
Global Security for all purposes whatsoever.  Notwithstanding the foregoing,
nothing herein shall prevent the Corporation, the Trustee or any agent of the
Corporation or the Trustee from giving effect to any written certification,
proxy or other authorization furnished by a Depositary or impair, as between a
Depositary and such holders of beneficial interests, the operation of customary
practices governing the exercise of the rights of the Depositary (or its
nominee) as Holder of any Security.

     Section 3.10. Cancellation.

     All Securities surrendered for payment, redemption, transfer or exchange
shall, if surrendered to any Person other than the Trustee, be delivered to the
Trustee, and any such Securities and Securities surrendered directly to the
Trustee for any such purpose shall be promptly canceled by it. The Corporation
may at any time deliver to the Trustee for cancellation any Securities
previously authenticated and delivered hereunder that the Corporation may have
acquired in any manner whatsoever, and all Securities so delivered shall be
promptly canceled by the Trustee. No Securities shall be authenticated in lieu
of or in exchange for any Securities canceled as provided in this Section,
except as expressly permitted by this Indenture. All canceled Securities shall
be destroyed by the Trustee and the Trustee shall deliver to the Corporation a
certificate of such destruction.

     Section 3.11. Computation of Interest.

     Except as otherwise specified as contemplated by Section 3.1 for Securities
of any series, interest on the Securities of each series for any partial period
shall be computed on the basis of a 360-day year of twelve 30-day months and the
actual number of days elapsed in any partial month in such period, and interest
on the Securities of each series for a full period shall be computed by dividing
the rate per annum by the number of interest periods that together constitute a
full twelve months.

     Section 3.12. Deferrals of Interest Payment Dates.

     If specified as contemplated by Section 2.1 or Section 3.1 with respect to
the Securities of a particular series, so long as no Event of Default has
occurred and is continuing, the Corporation shall have the right, at any time
during the term of such series, from time to time to defer the payment of
interest on such Securities for such period or periods as may be specified as
contemplated by Section 3.1 (each, an "Extension Period"), during which
Extension Periods the Corporation shall, if so specified as contemplated by
Section 3.1, have the right to make partial payments of interest on

                                      -31-
<PAGE>
 
any Interest Payment Date. No Extension Period shall end on a date other than an
Interest Payment Date. At the end of any such Extension Period the Corporation
shall pay all interest then accrued and unpaid on the Securities (together with
Additional Interest thereon, if any, at the rate specified for the Securities of
such series to the extent permitted by applicable law); provided, however, that
no Extension Period shall extend beyond the Stated Maturity of the principal of
the Securities of such series; and provided further, however that during any
such Extension Period, the Corporation shall not (i) declare or pay any
dividends or distributions on, redeem, purchase or acquire, or make a
liquidation payment with respect to, any of the Corporation's capital stock, or
(ii) make any payment of principal of or interest or premium, if any, on or
repay, repurchase or redeem any debt securities of the Corporation that rank
pari passu in all respects with or junior in interest to the Securities of such
series (other than (a) repurchases, redemptions or other acquisitions of shares
of capital stock of the Corporation in connection with any employment contract,
benefit plan or other similar arrangement with or for the benefit of any one or
more employees, officers, directors or consultants, in connection with a
dividend reinvestment or stockholder stock purchase plan or in connection with
the issuance of capital stock of the Corporation (or securities convertible into
or exercisable for such capital stock) as consideration in an acquisition
transaction entered into prior to the applicable Extension Period, (b) as a
result of an exchange or conversion of any class or series of the Corporation's
capital stock (or any capital stock of a Subsidiary of the Corporation) for any
class or series of the Corporation's capital stock or of any class or series of
the Corporation's indebtedness for any class or series of the Corporation's
capital stock, (c) the purchase of fractional interests in shares of the
Corporation's capital stock pursuant to the conversion or exchange provisions of
such capital stock or the security being converted or exchanged, (d) any
declaration of a dividend in connection with any Rights Plan, or the issuance of
rights, stock or other property under any Rights Plan, or the redemption or
repurchase of rights pursuant thereto, or (e) any dividend in the form of stock,
warrants, options or other rights where the dividend stock or the stock issuable
upon exercise of such warrants, options or other rights is the same stock as
that on which the dividend is being paid or ranks pari passu with or junior to
such stock). Prior to the termination of any such Extension Period, the
Corporation may further defer the payment of interest, provided that no
Extension Period shall exceed the period or periods specified in such
Securities, extend beyond the Stated Maturity of the principal of such
Securities or end on a date other than an Interest Payment Date. Upon the
termination of any such Extension Period and upon the payment of all accrued and
unpaid interest and any Additional Interest then due on any Interest Payment
Date, the Corporation may elect to begin a new Extension Period, subject to the
above conditions. No interest or Additional Interest shall be due and payable
during an Extension Period, except at the end thereof, but each installment of
interest that would otherwise have been due and payable during such Extension
Period shall bear Additional Interest as and to the extent as may be specified
as contemplated by Section 3.1. The Corporation shall give the Holders of the
Securities of such series and the Trustee notice of its election to begin any
such Extension Period at least one Business Day prior to the next succeeding
Interest Payment Date on which interest on Securities of such series would be
payable but for such deferral or, with respect to any Securities of a series
issued to an Issuer Trust, so long as any such Securities are held by such
Issuer Trust, at least one Business Day prior to the earlier of (i) the next
succeeding date on which Distributions on the Preferred Securities of such
Issuer Trust would be payable but for such deferral, and (ii) the date on which
the Property Trustee of such Issuer Trust is required to give notice to any
securities exchange or other applicable self-regulatory organization or to
holders of such Preferred Securities of the record date or the date such
Distributions are payable.

     The Trustee shall promptly give notice of the Corporation's election to
begin any such

                                      -32-
<PAGE>
 
Extension Period to the Holders of the Outstanding Securities of such series.

     Section 3.13. Right of Set-Off.

     With respect to the Securities of a series initially issued to an Issuer
Trust, notwithstanding anything to the contrary herein, the Corporation shall
have the right to set off any payment it is otherwise required to make in
respect of any such Security to the extent the Corporation has theretofore made,
or is concurrently on the date of such payment making, a payment under the
Guarantee Agreement relating to such Security or to a holder of Preferred
Securities pursuant to an action undertaken under Section 5.8 of this Indenture.

     Section 3.14. Agreed Tax Treatment.

     Each Security issued hereunder shall provide that the Corporation and, by
its acceptance of a Security or a beneficial interest therein, the Holder of,
and any Person that acquires a beneficial interest in, such Security agree that
for United States federal, state and local tax purposes it is intended that such
Security constitutes indebtedness.

     Section 3.15. Shortening or Extension of Stated Maturity.

     If specified as contemplated by Section 2.1 or Section 3.1 with respect to
the Securities of a particular series, the Corporation shall have the right to
(i) shorten the Stated Maturity of the principal of the Securities of such
series at any time to any date not earlier than the first date on which the
Company has the right to redeem the Securities of such series, and (ii) extend
the Stated Maturity of the principal of the Securities of such series at any
time at its election for one or more periods, but in no event to a date later
than the 49th anniversary of the first Interest Payment Date following the
Original Issue Date of the Securities of such series; provided that, if the
Company elects to exercise its right to extend the Stated Maturity of the
principal of the Securities of such series pursuant to clause (ii) above, at the
time such election is made and at the time of extension (A) the Company is not
in bankruptcy, otherwise insolvent or in liquidation, (B) the Company is not in
default in the payment of any interest or principal on such Securities, (C) in
the case of Securities initially issued to an Issuer Trust, if the Issuer Trust
has not been liquidated, such Issuer Trust is not in arrears on payments of
Distributions on the Preferred Securities issued by such Issuer Trust and no
deferred Distributions are accumulated, (D) such Securities are rated not less
than BBB- by Standard & Poor's Ratings Services or Baa3 by Moody's Investors
Service, Inc. or the equivalent by any other nationally recognized statistical
rating organization and (E) after such extension, the Securities shall not have
a remaining term to maturity of more than 30 years. In the event the Company
elects to shorten or extend the Stated Maturity of the Securities of such
series, it shall give notice to the Trustee, and the Trustee shall give notice
of such shortening or extension to the Holders, no less than 30 and no more than
60 days prior to the effectiveness thereof.

     Section 3.16. CUSIP Numbers.

     The Corporation in issuing the Securities may use "CUSIP" numbers (if then
generally in use), and, if so, the Trustee shall use "CUSIP" numbers in notices
of redemption and other similar or related materials as a convenience to
Holders; provided that any such notice or other materials may state that no
representation is made as to the correctness of such numbers either as printed
on the

                                      -33-
<PAGE>
 
Securities or as contained in any notice of redemption or other materials and
that reliance may be placed only on the other identification numbers printed on
the Securities, and any such redemption shall not be affected by any defect in
or omission of such numbers.


                                  ARTICLE IV

                          Satisfaction and Discharge

     Section 4.1. Satisfaction and Discharge of Indenture.

     This Indenture shall, upon Corporation Request, cease to be of further
effect (except as to any surviving rights of registration of transfer or
exchange of Securities herein expressly provided for and as otherwise provided
in this Section 4.1) and the Trustee, on demand of and at the expense of the
Corporation, shall execute proper instruments acknowledging satisfaction and
discharge of this Indenture, when

     (1)  either

          (A)  all Securities theretofore authenticated and delivered (other
     than (i) Securities that have been destroyed, lost or stolen and that have
     been replaced or paid as provided in Section 3.7 and (ii) Securities for
     whose payment money has theretofore been deposited in trust or segregated
     and held in trust by the Corporation and thereafter repaid to the
     Corporation or discharged from such trust, as provided in Section 10.3)
     have been delivered to the Trustee for cancellation; or

          (B)  all such Securities not theretofore delivered to the Trustee for
     cancellation

          (i)   have become due and payable, or

          (ii)  will become due and payable at their Stated Maturity within one
                year of the date of deposit, or

          (iii) are to be called for redemption within one year under
                arrangements satisfactory to the Trustee for the giving of
                notice of redemption by the Trustee in the name, and at the
                expense, of the Corporation,

     and the Corporation, in the case of subclause (B)(i), (ii) or (iii) above,
     has deposited or caused to be deposited with the Trustee as trust funds in
     trust for such purpose an amount in the currency or currencies in which the
     Securities of such series are payable sufficient to pay and discharge the
     entire indebtedness on such Securities not theretofore delivered to the
     Trustee for cancellation, for principal (and premium, if any) and interest
     (including any Additional Interest) to the date of such deposit (in the
     case of Securities that have become due and payable) or to the Stated
     Maturity or Redemption Date, as the case may be;

     (2)  the Corporation has paid or caused to be paid all other sums payable
hereunder by the Corporation; and

                                      -34-
<PAGE>
 
     (3)  the Corporation has delivered to the Trustee an Officers' Certificate
and an Opinion of Counsel each stating that all conditions precedent herein
provided for relating to the satisfaction and discharge of this Indenture have
been complied with.

Notwithstanding the satisfaction and discharge of this Indenture, the
obligations of the Corporation to the Trustee under Section 6.7, the obligations
of the Trustee to any Authenticating Agent under Section 6.14 and, if money
shall have been deposited with the Trustee pursuant to subclause (B) of Clause
(1) of this Section, the obligations of the Trustee under Section 4.2 and the
last paragraph of Section 10.3 shall survive.

     Section 4.2. Application of Trust Money.

     Subject to the provisions of the last paragraph of Section 10.3, all money
deposited with the Trustee pursuant to Section 4.1 shall be held in trust and
applied by the Trustee, in accordance with the provisions of the Securities and
this Indenture, to the payment, either directly or through any Paying Agent
(including the Corporation acting as its own Paying Agent) as the Trustee may
determine, to the Persons entitled thereto, of the principal (and premium, if
any) and interest (including any Additional Interest) for the payment of which
such money or obligations have been deposited with or received by the Trustee.


                                   ARTICLE V

                                   Remedies

     Section 5.1. Events of Default.

     "Event of Default", wherever used herein with respect to the Securities of
any series, means any one of the following events (whatever the reason for such
Event of Default and whether it shall be voluntary or involuntary or be effected
by operation of law or pursuant to any judgment, decree or order of any court or
any order, rule or regulation of any administrative or governmental body) except
as may be specified pursuant to Section 3.1:

     (1)  default in the payment of any interest upon any Security of that
series, including any Additional Interest in respect thereof, when it becomes
due and payable, and continuance of such default for a period of 30 days
(subject to the deferral of any due date in the case of an Extension Period); or

     (2)  default in the payment of the principal of (or premium, if any, on)
any Security of that series at its Maturity; or

     (3)  failure on the part of the Corporation duly to observe or perform any
other of the covenants or agreements on the part of the Corporation in the
Securities of that series or in this Indenture for a period of 90 days after the
date on which written notice of such failure, requiring the Corporation to
remedy the same, shall have been given to the Corporation by the Trustee by
registered or certified mail or to the Corporation and the Trustee by the
Holders of at least 25% in aggregate principal amount of the Outstanding
Securities of that series; or

                                      -35-
<PAGE>
 
     (4)  the entry of a decree or order by a court having jurisdiction in the
premises adjudging the Corporation a bankrupt or insolvent, or approving as
properly filed a petition seeking reorganization of the Corporation under the
Bankruptcy Code or any other similar applicable federal or state law, which
decree or order shall have continued undischarged and unstayed for a period of
60 days; or the entry of a decree or order of a court having jurisdiction in the
premises for the appointment of a receiver or liquidator or trustee or assignee
in bankruptcy or insolvency of the Corporation or of its property, or for the
winding up or liquidation of its affairs, which decree or order shall have
continued undischarged and unstayed for a period of 60 days; or

     (5)  the commencement by the Corporation of voluntary proceedings to be
adjudicated a bankrupt, or consent by the Corporation to the filing of a
bankruptcy proceeding against it, or the filing by the Corporation of a petition
or answer or consent seeking reorganization under the Bankruptcy Code or any
other similar federal or state law, or consent by the Corporation to the filing
of any such petition, or the consent by the Corporation to the appointment of a
receiver or liquidator or trustee or assignee in bankruptcy or insolvency of it
or of its property, or the making by the Corporation of an assignment for the
benefit of creditors, or the admission by the Corporation in writing of its
inability to pay its debts generally as they become due; or

     (6)  any other Event of Default provided with respect to Securities of that
series.

     Section 5.2. Acceleration of Maturity; Rescission and Annulment.

     If an Event of Default (other than an Event of Default specified in Section
5.1(4) or 5.1(5)) with respect to Securities of any series at the time
Outstanding occurs and is continuing, then and in every such case the Trustee or
the Holders of not less than 25% in aggregate principal amount of the
Outstanding Securities of that series may declare the principal amount (or, if
the Securities of that series are Discount Securities, such portion of the
principal amount as may be specified in the terms of that series) of all the
Securities of that series to be due and payable immediately, by a notice in
writing to the Corporation (and to the Trustee if given by Holders), provided
that, in the case of the Securities of a series issued to an Issuer Trust, if,
upon an Event of Default, the Trustee or the Holders of not less than 25% in
principal amount of the Outstanding Securities of such series fail to declare
the principal of all the Outstanding Securities of such series to be immediately
due and payable, the holders of at least 25% in aggregate Liquidation Amount (as
defined in the related Trust Agreement) of the related series of Preferred
Securities issued by such Issuer Trust then outstanding shall have the right to
make such declaration by a notice in writing to the Corporation and the Trustee;
and upon any such declaration such principal amount (or specified portion
thereof) of and the accrued interest (including any Additional Interest) on all
the Securities of such series shall become immediately due and payable. If an
Event of Default specified in Section 5.1(4) or 5.1(5) with respect to
Securities of any series at the time Outstanding occurs, the principal amount of
all the Securities of such series (or, if the Securities of such series are
Discount Securities, such portion of the principal amount of such Securities as
may be specified by the terms of that series) shall automatically, and without
any declaration or other action on the part of the Trustee or any Holder, become
immediately due and payable. Payment of principal and interest (including any
Additional Interest) on such Securities shall remain subordinated to the extent
provided in Article XIII notwithstanding that such amount shall become
immediately due and payable as herein provided.

     At any time after such a declaration of acceleration with respect to
Securities of any series has

                                      -36-
<PAGE>
 
been made and before a judgment or decree for payment of the money due has been
obtained by the Trustee as hereinafter in this Article provided, the Holders of
a majority in aggregate principal amount of the Outstanding Securities of that
series, by written notice to the Corporation and the Trustee, may rescind and
annul such declaration and its consequences if:

     (1)  the Corporation has paid or deposited with the Trustee a sum
sufficient to pay:

          (A)  all overdue installments of interest on all Securities of such
     series,

          (B)  any accrued Additional Interest on all Securities of such series,

          (C)  the principal of (and premium, if any, on) any Securities of such
     series that have become due otherwise than by such declaration of
     acceleration and interest and Additional Interest thereon at the rate borne
     by the Securities, and

          (D)  all sums paid or advanced by the Trustee hereunder and the
     reasonable compensation, expenses, disbursements and advances of the
     Trustee, its agents and counsel; and

     (2)  all Events of Default with respect to Securities of that series, other
than the non-payment of the principal of Securities of that series that has
become due solely by such acceleration, have been cured or waived as provided in
Section 5.13.

     In the case of Securities of a series initially issued to an Issuer Trust,
if the Holders of such Securities fail to annul such declaration and waive such
default, the holders of a majority in aggregate Liquidation Amount (as defined
in the related Trust Agreement) of the related series of Preferred Securities
issued by such Issuer Trust then outstanding shall also have the right to
rescind and annul such declaration and its consequences by written notice to the
Corporation and the Trustee, subject to the satisfaction of the conditions set
forth in Clauses (1) and (2) above of this Section 5.2.

     No such rescission shall affect any subsequent default or impair any right
consequent thereon.

     Section 5.3. Collection of Indebtedness and Suits for Enforcement by
Trustee.

     The Corporation covenants that if:

     (1)  default is made in the payment of any installment of interest
(including any Additional Interest) on any Security of any series when such
interest becomes due and payable and such default continues for a period of 30
days, or

     (2)  default is made in the payment of the principal of (and premium, if
any, on) any Security at the Maturity thereof,

the Corporation will, upon demand of the Trustee, pay to the Trustee, for the
benefit of the Holders of such Securities, the whole amount then due and payable
on such Securities for principal, including any sinking fund payment or
analogous obligations (and premium, if any) and interest (including any
Additional Interest), and, in addition thereto, all amounts owing the Trustee
under Section 6.7.

                                      -37-
<PAGE>
 
Payment of principal, including any sinking fund payment or analogous
obligations (and premium, if any) and interest (including any Additional
Interest) on such Securities shall remain subordinated to the extent provided in
Article XIII notwithstanding that such amount shall become immediately due and
payable as herein provided.

     If the Corporation fails to pay such amounts forthwith upon such demand,
the Trustee, in its own name and as trustee of an express trust, may institute a
judicial proceeding for the collection of the sums so due and unpaid, and may
prosecute such proceeding to judgment or final decree, and may enforce the same
against the Corporation or any other obligor upon such Securities and collect
the moneys adjudged or decreed to be payable in the manner provided by law out
of the property of the Corporation or any other obligor upon the Securities,
wherever situated.

     If an Event of Default with respect to Securities of any series occurs and
is continuing, the Trustee may in its discretion proceed to protect and enforce
its rights and the rights of the Holders of Securities of such series by such
appropriate judicial proceedings as the Trustee shall deem most effectual to
protect and enforce any such rights, whether for the specific enforcement of any
covenant or agreement in this Indenture or in aid of the exercise of any power
granted herein, or to enforce any other proper remedy.

     Section 5.4. Trustee May File Proofs of Claim.

     In case of any receivership, insolvency, liquidation, bankruptcy,
reorganization, arrangement, adjustment, composition or other judicial
proceeding relative to the Corporation or any other obligor upon the Securities
or the property of the Corporation or of such other obligor or their creditors,

          (a)  the Trustee (irrespective of whether the principal of the
     Securities of any series shall then be due and payable as therein expressed
     or by declaration or otherwise and irrespective of whether the Trustee
     shall have made any demand on the Corporation for the payment of overdue
     principal (and premium, if any) or interest (including any Additional
     Interest)) shall be entitled and empowered, by intervention in such
     proceeding or otherwise,

               (i) to file and prove a claim for the whole amount of principal
          (and premium, if any) and interest (including any Additional Interest)
          owing and unpaid in respect to the Securities and to file such other
          papers or documents as may be necessary or advisable and to take any
          and all actions as are authorized under the Trust Indenture Act in
          order to have the claims of the Holders and any predecessor to the
          Trustee under Section 6.7 allowed in any such judicial proceedings;
          and

               (ii) in particular, the Trustee shall be authorized to collect
          and receive any moneys or other property payable or deliverable on any
          such claims and to distribute the same in accordance with Section 5.6;
          and

          (b)  any custodian, receiver, assignee, trustee, liquidator,
     sequestrator (or other similar official) in any such judicial proceeding is
     hereby authorized by each Holder to make such payments to the Trustee for
     distribution in accordance with Section 5.6, and in the event that the
     Trustee shall consent to the making of such payments directly to the
     Holders, to pay to the Trustee any amount due to it and any predecessor
     Trustee under Section 6.7.

                                      -38-
<PAGE>
 
     Nothing herein contained shall be deemed to authorize the Trustee to
authorize or consent to or accept or adopt on behalf of any Holder any plan of
reorganization, arrangement, adjustment or composition affecting the Securities
or the rights of any Holder thereof, or to authorize the Trustee to vote in
respect of the claim of any Holder in any such proceeding; provided, however,
that the Trustee may, on behalf of the Holders, vote for the election of a
trustee in bankruptcy or similar official and be a member of a creditors' or
other similar committee.

     Section 5.5. Trustee May Enforce Claim Without Possession of Securities.

     All rights of action and claims under this Indenture or the Securities may
be prosecuted and enforced by the Trustee without the possession of any of the
Securities or the production thereof in any proceeding relating thereto, and any
such proceeding instituted by the Trustee shall be brought in its own name as
trustee of an express trust, and any recovery of judgment shall, subject to
Article XIII and after provision for the payment of all the amounts owing the
Trustee and any predecessor Trustee under Section 6.7, its agents and counsel,
be for the ratable benefit of the Holders of the Securities in respect of which
such judgment has been recovered.

     Section 5.6. Application of Money Collected.

     Any money or property collected or to be applied by the Trustee with
respect to a series of Securities pursuant to this Article shall be applied in
the following order, at the date or dates fixed by the Trustee and, in case of
the distribution of such money or property on account of principal (or premium,
if any) or interest (including any Additional Interest), upon presentation of
the Securities and the notation thereon of the payment if only partially paid
and upon surrender thereof if fully paid:

     FIRST: To the payment of all amounts due the Trustee and any predecessor
Trustee under Section 6.7;

     SECOND: Subject to Article XIII, to the payment of the amounts then due and
unpaid upon Securities of such series for principal (and premium, if any) and
interest (including any Additional Interest) in respect of which or for the
benefit of which such money has been collected, ratably, without preference or
priority of any kind, according to the amounts due and payable on such series of
Securities for principal (and premium, if any) and interest (including any
Additional Interest), respectively; and

     THIRD: The balance, if any, to the Person or Persons entitled thereto.

     Section 5.7. Limitation on Suits.

     Subject to Section 5.8, no Holder of any Securities of any series shall
have any right to institute any proceeding, judicial or otherwise, with respect
to this Indenture or for the appointment of a receiver, assignee, trustee,
liquidator, sequestrator (or other similar official) or for any other remedy
hereunder, unless:

     (1)  such Holder has previously given written notice to the Trustee of a
continuing Event of Default with respect to the Securities of that series;

                                      -39-
<PAGE>
 
     (2)  the Holders of not less than 25% in aggregate principal amount of the
Outstanding Securities of that series shall have made written request to the
Trustee to institute proceedings in respect of such Event of Default in its own
name as Trustee hereunder;

     (3)  such Holder or Holders have offered to the Trustee reasonable
indemnity against the costs, expenses and liabilities to be incurred in
compliance with such request;

     (4)  the Trustee for 60 days after its receipt of such notice, request and
offer of indemnity has failed to institute any such proceeding; and

     (5)  no direction inconsistent with such written request has been given to
the Trustee during such 60-day period by the Holders of a majority in aggregate
principal amount of the Outstanding Securities of that series;

it being understood and intended that no one or more of such Holders shall have
any right in any manner whatever by virtue of, or by availing itself of, any
provision of this Indenture to affect, disturb or prejudice the rights of any
other Holders of Securities, or to obtain or to seek to obtain priority or
preference over any other of such Holders or to enforce any right under this
Indenture, except in the manner herein provided and for the equal and ratable
benefit of all such Holders.

     Section 5.8. Unconditional Right of Holders to Receive Principal, Premium
and Interest; Direct Action by Holders of Preferred Securities.

     Notwithstanding any other provision in this Indenture, the Holder of any
Security of any series shall have the right, which is absolute and
unconditional, to receive payment of the principal of (and premium, if any) and
(subject to Sections 3.8 and 3.12) interest (including any Additional Interest)
on such Security on the respective Stated Maturities expressed in such Security
(or, in the case of redemption, on the Redemption Date) and to institute suit
for the enforcement of any such payment, and such right shall not be impaired
without the consent of such Holder. In the case of Securities of a series issued
to an Issuer Trust, any registered holder of the series of Preferred Securities
issued by such Issuer Trust shall have the right, upon the occurrence of an
Event of Default described in Section 5.1(1) or 5.1(2), to institute a suit
directly against the Corporation for enforcement of payment to such holder of
principal of (and premium, if any) and (subject to Sections 3.8 and 3.12)
interest (including any Additional Interest) on the Securities having a
principal amount equal to the aggregate Liquidation Amount (as defined in the
related Trust Agreement) of such Preferred Securities held by such holder.

     Section 5.9. Restoration of Rights and Remedies.

     If the Trustee, any Holder or any holder of Preferred Securities issued by
any Issuer Trust has instituted any proceeding to enforce any right or remedy
under this Indenture and such proceeding has been discontinued or abandoned for
any reason, or has been determined adversely to the Trustee, such Holder or such
holder of Preferred Securities, then and in every such case the Corporation, the
Trustee, such Holders and such holder of Preferred Securities shall, subject to
any determination in such proceeding, be restored severally and respectively to
their former positions hereunder, and thereafter all rights and remedies of the
Trustee, such Holder and such holder of Preferred Securities shall continue as
though no such proceeding had been instituted.

                                      -40-
<PAGE>
 
     Section 5.10. Rights and Remedies Cumulative.

     Except as otherwise provided in the last paragraph of Section 3.7, no right
or remedy herein conferred upon or reserved to the Trustee or the Holders is
intended to be exclusive of any other right or remedy, and every right and
remedy shall, to the extent permitted by law, be cumulative and in addition to
every other right and remedy given hereunder or now or hereafter existing at law
or in equity or otherwise. The assertion or employment of any right or remedy
hereunder, or otherwise, shall not prevent the concurrent assertion or
employment of any other appropriate right or remedy.

     Section 5.11. Delay or Omission Not Waiver.

     No delay or omission of the Trustee, any Holder of any Security or any
holder of any Preferred Security, in each case with respect to the Securities of
the related series, to exercise any right or remedy accruing upon any Event of
Default with respect to the Securities of the related series shall impair any
such right or remedy or constitute a waiver of any such Event of Default or an
acquiescence therein.

     Every right and remedy given by this Article or by law to the Trustee or to
the Holders and the right and remedy given to the holders of Preferred
Securities by Section 5.8 may be exercised from time to time, and as often as
may be deemed expedient, by the Trustee, the Holders or the holders of Preferred
Securities, as the case may be.

     Section 5.12. Control by Holders.

     The Holders of not less than a majority in aggregate principal amount of
the Outstanding Securities of any series shall have the right to direct the
time, method and place of conducting any proceeding for any remedy available to
the Trustee or exercising any trust or power conferred on the Trustee, with
respect to the Securities of such series, provided that:

     (1)  such direction shall not be in conflict with any rule of law or with
this Indenture,

     (2)  the Trustee may take any other action deemed proper by the Trustee
that is not inconsistent with such direction, and

     (3)  subject to the provisions of Section 6.1, the Trustee shall have the
right to decline to follow such direction if a Responsible Officer or Officers
of the Trustee shall, in good faith, determine that the proceeding so directed
would be unjustly prejudicial to the Holders not joining in any such direction
or would involve the Trustee in personal liability.

     Section 5.13. Waiver of Past Defaults.

     The Holders of not less than a majority in aggregate principal amount of
the Outstanding Securities of any series affected thereby and, in the case of
any Securities of a series initially issued to an Issuer Trust, the holders of a
majority in aggregate Liquidation Amount (as defined in the related Trust
Agreement) of the Preferred Securities issued by such Issuer Trust may waive any
past default hereunder and its consequences with respect to such series except a
default:

                                      -41-
<PAGE>
 
     (1)  in the payment of the principal of (or premium, if any) or interest
(including any Additional Interest) on any Security of such series (unless such
default has been cured and the Corporation has paid to or deposited with the
Trustee a sum sufficient to pay all matured installments of interest (including
any Additional Interest) and all principal of (and premium, if any, on) all
Securities of that series due otherwise than by acceleration), or

     (2)  in respect of a covenant or provision hereof that under Article IX
cannot be modified or amended without the consent of each Holder of any
Outstanding Security of such series affected.

     Any such waiver shall be deemed to be on behalf of the Holders of all the
Securities of such series or, in the case of a waiver by holders of Preferred
Securities issued by such Issuer Trust, by all holders of Preferred Securities
issued by such Issuer Trust.

     Upon any such waiver, such default shall cease to exist, and any Event of
Default arising therefrom shall be deemed to have been cured, for every purpose
of this Indenture; but no such waiver shall extend to any subsequent or other
default or impair any right consequent thereon.

     Section 5.14. Undertaking for Costs.

     All parties to this Indenture agree, and each Holder of any Security by his
acceptance thereof shall be deemed to have agreed, that any court may in its
discretion require, in any suit for the enforcement of any right or remedy under
this Indenture, or in any suit against the Trustee for any action taken or
omitted by it as Trustee, the filing by any party litigant in such suit of an
undertaking to pay the costs of such suit, and that such court may in its
discretion assess reasonable costs, including reasonable attorneys' fees,
against any party litigant in such suit, having due regard to the merits and
good faith of the claims or defenses made by such party litigant; but the
provisions of this Section shall not apply to any suit instituted by the
Trustee, to any suit instituted by any Holder, or group of Holders, holding in
the aggregate more than 10% in aggregate principal amount of the Outstanding
Securities of any series, or to any suit instituted by any Holder for the
enforcement of the payment of the principal of (or premium, if any) or interest
(including any Additional Interest) on any Security on or after the respective
Stated Maturities expressed in such Security.

     Section 5.15. Waiver of Usury, Stay or Extension Laws.

     The Corporation covenants (to the extent that it may lawfully do so) that
it will not at any time insist upon, or plead, or in any manner whatsoever claim
or take the benefit or advantage of, any usury, stay or extension law wherever
enacted, now or at any time hereafter in force, which may affect the covenants
or the performance of this Indenture; and the Corporation (to the extent that it
may lawfully do so) hereby expressly waives all benefit or advantage of any such
law, and covenants that it will not hinder, delay or impede the execution of any
power herein granted to the Trustee, but will suffer and permit the execution of
every such power as though no such law had been enacted.

                                      -42-
<PAGE>
 
                                  ARTICLE VI

                                  The Trustee

     Section 6.1. Certain Duties and Responsibilities.

     (a)  Except during the continuance of an Event
of Default,

     (1)  the Trustee undertakes to perform such duties and only such duties
as are specifically set forth in this Indenture, and no implied covenants or
obligations shall be read into this Indenture against the Trustee; and

     (2)  in the absence of bad faith on its part, the Trustee may conclusively
rely, as to the truth of the statements and the correctness of the opinions
expressed therein, upon certificates or opinions furnished to the Trustee and
conforming to the requirements of this Indenture; but in the case of any such
certificates or opinions that by any provisions hereof are specifically required
to be furnished to the Trustee, the Trustee shall be under a duty to examine the
same to determine whether or not they conform to the requirements of this
Indenture.

     (b)  In case an Event of Default has occurred and is continuing, the
Trustee shall exercise such of the rights and powers vested in it by this
Indenture, and use the same degree of care and skill in their exercise, as a
prudent person would exercise or use under the circumstances in the conduct of
his or her own affairs.

     (c)  No provision of this Indenture shall be construed to relieve the
Trustee from liability for its own negligent action, its own negligent failure
to act, or its own willful misconduct except that

     (1)  this Subsection shall not be construed to limit the effect of
Subsection (a) of this Section;

     (2)  the Trustee shall not be liable for any error of judgment made in good
faith by a Responsible Officer, unless it shall be proved that the Trustee was
negligent in ascertaining the pertinent facts; and

     (3)  the Trustee shall not be liable with respect to any action taken or
omitted to be taken by it in good faith in accordance with the direction of
Holders pursuant to Section 5.12 relating to the time, method and place of
conducting any proceeding for any remedy available to the Trustee, or exercising
any trust or power conferred upon the Trustee, under this Indenture with respect
to the Securities of a series.

     (d)  No provision of this Indenture shall require the Trustee to expend or
risk its own funds or otherwise incur any financial liability in the performance
of any of its duties hereunder, or in the exercise of any of its rights or
powers, if there shall be reasonable grounds for believing that repayment of
such funds or adequate indemnity against such risk or liability is not
reasonably assured to it.

     (e)  Whether or not therein expressly so provided, every provision of this
Indenture relating to the conduct or affecting the liability of or affording
protection to the Trustee shall be subject to the

                                      -43-
<PAGE>
 
provisions of this Section.

     Section 6.2. Notice of Defaults.

     Within 90 days after actual knowledge by a Responsible Officer of the
Trustee of the occurrence of any default hereunder with respect to the
Securities of any series, the Trustee shall transmit by mail to all Holders of
Securities of such series, as their names and addresses appear in the Securities
Register, notice of such default, unless such default shall have been cured or
waived; provided, however, that, except in the case of a default in the payment
of the principal of (or premium, if any) or interest (including any Additional
Interest) on any Security of such series, the Trustee shall be protected in
withholding such notice if and so long as the board of directors, the executive
committee or a trust committee of directors and/or Responsible Officers of the
Trustee in good faith determines that the withholding of such notice is in the
interests of the Holders of Securities of such series; and provided, further,
that, in the case of any default of the character specified in Section 5.1(3),
no such notice to Holders of Securities of such series shall be given until at
least 30 days after the occurrence thereof. For the purpose of this Section, the
term "default" means any event that is, or after notice or lapse of time or both
would become, an Event of Default with respect to Securities of such series.

     Section 6.3. Certain Rights of Trustee.

     Subject to the provisions of Section 6.1:

     (a)  the Trustee may rely and shall be protected in acting or refraining
from acting upon any resolution, certificate, statement, instrument, opinion,
report, notice, request, direction, consent, order, bond, debenture, Security or
other paper or document believed by it to be genuine and to have been signed or
presented by the proper party or parties;

     (b)  any request or direction of the Corporation mentioned herein shall be
sufficiently evidenced by a Corporation Request or Corporation Order and any
resolution of the Board of Directors shall be sufficiently evidenced by a Board
Resolution;

     (c)  whenever in the administration of this Indenture the Trustee shall
deem it desirable that a matter be proved or established prior to taking,
suffering or omitting any action hereunder, the Trustee (unless other evidence
be herein specifically prescribed) may, in the absence of bad faith on its part,
rely upon an Officers' Certificate;

     (d)  the Trustee may consult with counsel and the advice of such counsel or
any Opinion of Counsel shall be full and complete authorization and protection
in respect of any action taken, suffered or omitted by it hereunder in good
faith and in reliance thereon;

     (e)  the Trustee shall be under no obligation to exercise any of the rights
or powers vested in it by this Indenture at the request or direction of any of
the Holders pursuant to this Indenture, unless such Holders shall have offered
to the Trustee reasonable security or indemnity against the costs, expenses and
liabilities that might be incurred by it in compliance with such request or
direction;

     (f)  the Trustee shall not be bound to make any investigation into the
facts or matters stated in

                                      -44-
<PAGE>
 
any resolution, certificate, statement, instrument, opinion, report, notice,
request, direction, consent, order, bond, indenture, Security or other paper or
document, but the Trustee in its discretion may make such inquiry or
investigation into such facts or matters as it may see fit, and, if the Trustee
shall determine to make such inquiry or investigation, it shall be entitled to
examine the books, records and premises of the Corporation, personally or by
agent or attorney; and

     (g)  the Trustee may execute any of the trusts or powers hereunder or
perform any duties hereunder either directly or by or through agents or
attorneys and the Trustee shall not be responsible for any misconduct or
negligence on the part of any agent or attorney appointed with due care by it
hereunder.

     Section 6.4. Not Responsible for Recitals or Issuance of Securities.

     The recitals contained herein and in the Securities, except the Trustee's
certificates of authentication, shall be taken as the statements of the
Corporation, and neither the Trustee nor any Authenticating Agent assumes any
responsibility for their correctness. The Trustee makes no representations as to
the validity or sufficiency of this Indenture or of the Securities. Neither the
Trustee nor any Authenticating Agent shall be accountable for the use or
application by the Corporation of the Securities or the proceeds thereof.

     Section 6.5. May Hold Securities.

     The Trustee, any Authenticating Agent, any Paying Agent, any Securities
Registrar or any other agent of the Corporation, in its individual or any other
capacity, may become the owner or pledgee of Securities and, subject to Sections
6.8 and 6.13, may otherwise deal with the Corporation with the same rights it
would have if it were not Trustee, Authenticating Agent, Paying Agent,
Securities Registrar or such other agent.

     Section 6.6. Money Held in Trust.

     Money held by the Trustee in trust hereunder need not be segregated from
other funds except to the extent required by law. The Trustee shall be under no
liability for interest on any money received by it hereunder except as otherwise
agreed with the Corporation.

     Section 6.7. Compensation and Reimbursement.

     The Corporation agrees

     (1)  to pay to the Trustee from time to time reasonable compensation for
all services rendered by it hereunder in such amounts as the Corporation and the
Trustee shall agree from time to time (which compensation shall not be limited
by any provision of law in regard to the compensation of a trustee of an express
trust);

     (2)  to reimburse the Trustee upon its request for all reasonable expenses,
disbursements and advances incurred or made by the Trustee in accordance with
any provision of this Indenture (including the reasonable compensation and the
expenses and disbursements of its agents and counsel), except any such expense,
disbursement or advance as may be attributable to its negligence or bad

                                      -45-
<PAGE>
 
faith; and

     (3)  to indemnify the Trustee for, and to hold it harmless against, any
loss, liability or expense (including the reasonable compensation and the
expenses and disbursements of its agents and counsel) incurred without
negligence or bad faith, arising out of or in connection with the acceptance or
administration of this trust or the performance of its duties hereunder,
including the costs and expenses of defending itself against any claim or
liability in connection with the exercise or performance of any of its powers or
duties hereunder. This indemnification shall survive the termination of this
Indenture.

     When the Trustee incurs expenses or renders services after an Event of
Default specified in Section 5.1(4) or 5.1(5) occurs, the expenses and the
compensation for the services are intended to constitute expenses of
administration under the Bankruptcy Code or any successor statute.

     Section 6.8. Disqualification; Conflicting Interests.

     (a)  The Trustee for the Securities of any series issued hereunder shall be
subject to the provisions of Section 310(b) of the Trust Indenture Act. Nothing
herein shall prevent the Trustee from filing with the Commission the application
referred to in the second to last paragraph of said Section 310(b).

     (b)  The Trust Agreement and the Guarantee Agreement with respect to each
Issuer Trust shall be deemed to be specifically described in this Indenture for
the purposes of clause (i) of the first proviso contained in Section 310(b) of
the Trust Indenture Act.

     Section 6.9. Corporate Trustee Required; Eligibility.

     There shall at all times be a Trustee hereunder which shall be:

     (a)  a corporation organized and doing business under the laws of the
United States of America or of any State or Territory thereof or the District of
Columbia, authorized under such laws to exercise corporate trust powers and
subject to supervision or examination by federal, state, territorial or District
of Columbia authority, or

     (b)  a corporation or other Person organized and doing business under the
laws of a foreign government that is permitted to act as Trustee pursuant to a
rule, regulation or order of the Commission, authorized under such laws to
exercise corporate trust powers, and subject to supervision or examination by
authority of such foreign government or a political subdivision thereof
substantially equivalent to supervision or examination applicable to United
States institutional trustees,

in either case having a combined capital and surplus of at least $50,000,000,
subject to supervision or examination by federal or state authority. If such
corporation publishes reports of condition at least annually, pursuant to law or
to the requirements of the aforesaid supervising or examining authority, then,
for the purposes of this Section 6.9, the combined capital and surplus of such
corporation shall be deemed to be its combined capital and surplus as set forth
in its most recent report of condition so published. If at any time the Trustee
shall cease to be eligible in accordance with the provisions of this Section
6.9, it shall resign immediately in the manner and with the effect hereinafter
specified in

                                      -46-
<PAGE>
 
this Article VI. Neither the Corporation nor any Person directly or indirectly
controlling, controlled by or under common control with the Corporation shall
serve as Trustee for the Securities of any series issued hereunder.

     Section 6.10. Resignation and Removal; Appointment of Successor.

     (a)  No resignation or removal of the Trustee and no appointment of a
successor Trustee pursuant to this Article VI shall become effective until the
acceptance of appointment by the successor Trustee under Section 6.11.

     (b)  The Trustee may resign at any time with respect to the Securities of
one or more series by giving written notice thereof to the Corporation. If an
instrument of acceptance by a successor Trustee shall not have been delivered to
the Trustee within 30 days after the giving of such notice of resignation, the
resigning Trustee may petition any court of competent jurisdiction for the
appointment of a successor Trustee with respect to the Securities of such
series.

     (c)  The Trustee may be removed at any time with respect to the Securities
of any series by Act of the Holders of a majority in aggregate principal amount
of the Outstanding Securities of such series, delivered to the Trustee and to
the Corporation.

     (d)  If at any time:

     (1)  the Trustee shall fail to comply with Section 6.8 after written
request therefor by the Corporation or by any Holder who has been a bona fide
Holder of a Security for at least six months, or

     (2)  the Trustee shall cease to be eligible under Section 6.9 and shall
fail to resign after written request therefor by the Corporation or by any such
Holder, or

     (3)  the Trustee shall become incapable of acting or shall be adjudged a
bankrupt or insolvent or a receiver of the Trustee or of its property shall be
appointed or any public officer shall take charge or control of the Trustee or
of its property or affairs for the purpose of rehabilitation, conservation or
liquidation,

then, in any such case, (i) the Corporation, acting pursuant to the authority of
a Board Resolution, may remove the Trustee with respect to the Securities of all
series issued hereunder, or (ii) subject to Section 5.14, any Holder who has
been a bona fide Holder of a Security for at least six months may, on behalf of
such Holder and all others similarly situated, petition any court of competent
jurisdiction for the removal of the Trustee with respect to the Securities of
all series issued hereunder and the appointment of a successor Trustee or
Trustees.

     (e)  If the Trustee shall resign, be removed or become incapable of acting,
or if a vacancy shall occur in the office of Trustee for any cause with respect
to the Securities of one or more series, the Corporation, by a Board Resolution,
shall promptly appoint a successor Trustee with respect to the Securities of
that or those series. If, within one year after such resignation, removal or
incapability, or the occurrence of such vacancy, a successor Trustee with
respect to the Securities of any series shall be appointed by Act of the Holders
of a majority in aggregate principal amount of the

                                      -47-
<PAGE>
 
Outstanding Securities of such series delivered to the Corporation and the
retiring Trustee, the successor Trustee so appointed shall, forthwith upon its
acceptance of such appointment, become the successor Trustee with respect to the
Securities of such series and supersede the successor Trustee appointed by the
Corporation. If no successor Trustee with respect to the Securities of any
series shall have been so appointed by the Corporation or the Holders and
accepted appointment in the manner hereinafter provided, any Holder who has been
a bona fide Holder of a Security of such series for at least six months may,
subject to Section 5.14, on behalf of such Holder and all others similarly
situated, petition any court of competent jurisdiction for the appointment of a
successor Trustee with respect to the Securities of such series.

     (f)  The Corporation shall give notice of each resignation and each removal
of the Trustee with respect to the Securities of any series and each appointment
of a successor Trustee with respect to the Securities of any series by mailing
written notice of such event by first-class mail, postage prepaid, to the
Holders of Securities of such series as their names and addresses appear in the
Securities Register. Each notice shall include the name of the successor Trustee
with respect to the Securities of such series and the address of its Corporate
Trust Office.

     Section 6.11. Acceptance of Appointment by Successor.

     (a)  In case of the appointment hereunder of a successor Trustee with
respect to all Securities, every such successor Trustee so appointed shall
execute, acknowledge and deliver to the Corporation and to the retiring Trustee
an instrument accepting such appointment, and thereupon the resignation or
removal of the retiring Trustee shall become effective and such successor
Trustee, without any further act, deed or conveyance, shall become vested with
all the rights, powers, trusts and duties of the retiring Trustee; but, on the
request of the Corporation or the successor Trustee, such retiring Trustee
shall, upon payment of its charges, execute and deliver an instrument
transferring to such successor Trustee all the rights, powers and trusts of the
retiring Trustee and shall duly assign, transfer and deliver to such successor
Trustee all property and money held by such retiring Trustee hereunder.

     (b)  In case of the appointment hereunder of a successor Trustee with
respect to the Securities of one or more (but not all) series, the Corporation,
the retiring Trustee and each successor Trustee with respect to the Securities
of one or more series shall execute and deliver an indenture supplemental hereto
wherein each successor Trustee shall accept such appointment and which (1) shall
contain such provisions as shall be necessary or desirable to transfer and
confirm to, and to vest in, each successor Trustee all the rights, powers,
trusts and duties of the retiring Trustee with respect to the Securities of that
or those series to which the appointment of such successor Trustee relates, (2)
if the retiring Trustee is not retiring with respect to all Securities, shall
contain such provisions as shall be deemed necessary or desirable to confirm
that all the rights, powers, trusts and duties of the retiring Trustee with
respect to the Securities of that or those series as to which the retiring
Trustee is not retiring shall continue to be vested in the retiring Trustee, and
(3) shall add to or change any of the provisions of this Indenture as shall be
necessary to provide for or facilitate the administration of the trusts
hereunder by more than one Trustee, it being understood that nothing herein or
in such supplemental indenture shall constitute such Trustees co-trustees of the
same trust and that each such Trustee shall be trustee of a trust or trusts
hereunder separate and apart from any trust or trusts hereunder administered by
any other such Trustee; and upon the execution and delivery of such supplemental
indenture the resignation or removal of the retiring Trustee shall become
effective to the extent provided therein and each such successor Trustee,
without any further act, deed or conveyance,

                                      -48-
<PAGE>
 
shall become vested with all the rights, powers, trusts, and duties of the
retiring Trustee with respect to the Securities of that or those series to which
the appointment of such successor Trustee relates; but, on request of the
Corporation or any successor Trustee, such retiring Trustee shall duly assign,
transfer and deliver to such successor Trustee all property and money held by
such retiring Trustee hereunder with respect to the Securities of that or those
series to which the appointment of such successor Trustee relates.

     (c)  Upon request of any such successor Trustee, the Corporation shall
execute any and all instruments for more fully and certainly vesting in and
confirming to such successor Trustee all rights, powers and trusts referred to
in paragraph (a) or (b) of this Section, as the case may be.

     (d)  No successor Trustee shall accept its appointment unless at the
time of such acceptance such successor Trustee shall be qualified and eligible
under this Article.

     Section 6.12. Merger, Conversion, Consolidation or Succession to Business.

     Any corporation into which the Trustee may be merged or converted or with
which it may be consolidated, or any corporation resulting from any merger,
conversion or consolidation to which the Trustee shall be a party, or any
corporation succeeding to all or substantially all of the corporate trust
business of the Trustee, shall be the successor of the Trustee hereunder,
provided such corporation shall be otherwise qualified and eligible under this
Article, without the execution or filing of any paper or any further act on the
part of any of the parties hereto. In case any Securities shall have been
authenticated, but not delivered, by the Trustee then in office, any successor
by merger, conversion or consolidation to such authenticating Trustee may adopt
such authentication and deliver the Securities so authenticated, and in case any
Securities shall not have been authenticated, any successor to the Trustee may
authenticate such Securities either in the name of any predecessor Trustee or in
the name of such successor Trustee, and in all cases the certificate of
authentication shall have the full force which it is provided anywhere in the
Securities or in this Indenture that the certificate of the Trustee shall have.

     Section 6.13. Preferential Collection of Claims Against Corporation.

     If and when the Trustee shall be or become a creditor of the Corporation
(or any other obligor upon the Securities), the Trustee shall be subject to the
provisions of the Trust Indenture Act regarding the collection of claims against
the Corporation (or any such other obligor).

     Section 6.14. Appointment of Authenticating Agent.

     The Trustee may appoint an Authenticating Agent or Agents with respect to
one or more series of Securities, which shall be authorized to act on behalf of
the Trustee to authenticate Securities of such series issued upon original issue
and upon exchange, registration of transfer or partial redemption thereof or
pursuant to Section 3.6, and Securities so authenticated shall be entitled to
the benefits of this Indenture and shall be valid and obligatory for all
purposes as if authenticated by the Trustee hereunder. Wherever reference is
made in this Indenture to the authentication and delivery of Securities by the
Trustee or the Trustee's certificate of authentication, such reference shall be
deemed to include authentication and delivery on behalf of the Trustee by an
Authenticating Agent. Each Authenticating Agent shall be acceptable to the
Corporation and shall at all times be a corporation

                                      -49-
<PAGE>
 
organized and doing business under the laws of the United States of America, or
of any State or Territory thereof or the District of Columbia, authorized under
such laws to act as Authenticating Agent, having a combined capital and surplus
of not less than $50,000,000 and subject to supervision or examination by
federal or state authority. If such Authenticating Agent publishes reports of
condition at least annually, pursuant to law or to the requirements of said
supervising or examining authority, then for the purposes of this Section the
combined capital and surplus of such Authenticating Agent shall be deemed to be
its combined capital and surplus as set forth in its most recent report of
condition so published. If at any time an Authenticating Agent shall cease to be
eligible in accordance with the provisions of this Section, such Authenticating
Agent shall resign immediately in the manner and with the effect specified in
this Section.

     Any corporation into which an Authenticating Agent may be merged or
converted or with which it may be consolidated, or any corporation resulting
from any merger, conversion or consolidation to which an Authenticating Agent
shall be a party, or any corporation succeeding to all or substantially all of
the corporate trust business of an Authenticating Agent shall be a successor
Authenticating Agent hereunder, provided such corporation shall be otherwise
eligible under this Section, without the execution or filing of any paper or any
further act on the part of the Trustee or such Authenticating Agent.

     An Authenticating Agent may resign at any time by giving written notice
thereof to the Trustee and to the Corporation. The Trustee may at any time
terminate the agency of an Authenticating Agent by giving written notice thereof
to such Authenticating Agent and to the Corporation. Upon receiving such a
notice of resignation or upon such a termination, or in case at any time an
Authenticating Agent shall cease to be eligible in accordance with the
provisions of this Section, the Trustee may appoint a successor Authenticating
Agent, which shall be acceptable to the Corporation, and shall give notice of
such appointment in the manner provided in Section 1.6 to all Holders of
Securities of the series with respect to which such Authenticating Agent will
serve. Any successor Authenticating Agent upon acceptance of its appointment
hereunder shall become vested with all the rights, powers and duties of its
predecessor hereunder, with like effect as if originally named as an
Authenticating Agent. No successor Authenticating Agent shall be appointed
unless eligible under the provision of this Section.

     The Trustee agrees to pay to each Authenticating Agent from time to time
reasonable compensation for its services under this Section, and the Trustee
shall be entitled to be reimbursed for such payments, subject to the provisions
of Section 6.7.

     If an appointment with respect to one or more series is made pursuant to
this Section, the Securities of such series may have endorsed thereon, in
addition to the Trustee's certificate of authentication, an alternative
certificate of authentication in the following form:

                                      -50-
<PAGE>
 
     This is one of the Securities of the series designated therein referred to
in the within mentioned Indenture.



Dated:
                                 The First National Bank of Chicago,
                                 As Trustee


                                 By:
                                        As Authenticating Agent


                                 By:
                                        Authorized Officer



                                  ARTICLE VII

             Holder's Lists And Reports By Trustee And Corporation

     Section 7.1.  Corporation to Furnish Trustee Names and Addresses of
Holders.

     The Corporation will furnish or cause to be furnished to the Trustee:

          (a) semi-annually, on or before June 30 and December 31 of each year,
     a list, in such form as the Trustee may reasonably require, of the names
     and addresses of the Holders as of a date not more than 15 days prior to
     the delivery thereof, and

          (b) at such other times as the Trustee may request in writing, within
     30 days after the receipt by the Corporation of any such request, a list of
     similar form and content as of a date not more than 15 days prior to the
     time such list is furnished,

in each case to the extent such information is in the possession or control of
the corporation and has not otherwise been received by the Trustee in its
capacity as Securities Registrar.

     Section 7.2.  Preservation of Information, Communications to Holders.

     (a) The Trustee shall preserve, in as current a form as is reasonably
practicable, the names and addresses of Holders contained in the most recent
list furnished to the Trustee as provided in Section 7.1 and the names and
addresses of Holders received by the Trustee in its capacity as Securities
Registrar. The Trustee may destroy any list furnished to it as provided in
Section 7.1 upon receipt of a new list so furnished.

     (b) The rights of Holders to communicate with other Holders with respect to
their rights 

                                     -51-
<PAGE>
 
under this Indenture or under the Securities, and the corresponding rights and
privileges of the Trustee, shall be as provided in the Trust Indenture Act.

     (c) Every Holder of Securities, by receiving and holding the same, agrees
with the Corporation and the Trustee that neither the Corporation nor the
Trustee nor any agent of either of them shall be held accountable by reason of
the disclosure of information as to the names and addresses of the Holders made
pursuant to the Trust Indenture Act.

     Section 7.3.  Reports by Trustee.

     (a) The Trustee shall transmit to Holders such reports concerning the
Trustee and its actions under this Indenture as may be required pursuant to the
Trust Indenture Act, at the times and in the manner provided pursuant thereto.

     (b) Reports so required to be transmitted at stated intervals of not more
than 12 months shall be transmitted no later than July 15 in each calendar year,
commencing with July 15, 1997 after the first issuance of Securities under this
Indenture.

     (c) A copy of each such report shall, at the time of such transmission to
Holders, be filed by the Trustee with each securities exchange upon which any
Securities are listed and also with the Commission. The Corporation will notify
the Trustee when any Securities are listed on any securities exchange.

     Section 7.4.  Reports by Corporation.

     The Corporation shall file with the Trustee and with the Commission, and
transmit to Holders, such information, documents and other reports, and such
summaries thereof, as may be required pursuant to the Trust Indenture Act at the
times and in the manner provided in the Trust Indenture Act; provided that any
such information, documents or reports required to be filed with the Commission
pursuant to Section 13 or Section 15(d) of the Exchange Act shall be filed with
the Trustee within 15 days after the same is required to be filed with the
Commission. Notwithstanding that the Corporation may not be required to remain
subject to the reporting requirements of Section 13 or 15(d) of the Exchange
Act, the Corporation shall continue to file with the Commission and provide the
Trustee with the annual reports and the information, documents and other reports
which are specified in Sections 13 and 15(d) of the Exchange Act. The
Corporation also shall comply with the other provisions of Trust Indenture Act
Section 314(a).


                                 ARTICLE VIII

             Consolidation, Merger, Conveyance, Transfer or Lease

     Section 8.1.  Corporation May Consolidate, Etc., Only on Certain Terms.

     The Corporation shall not consolidate with or merge into any other Person
or convey, transfer or lease its properties and assets substantially as an
entirety to any Person, and no Person shall consolidate with or merge into the
Corporation or convey, transfer or lease its properties and assets

                                     -52-
<PAGE>
 
substantially as an entirety to the Corporation, unless:

     (1) if the Corporation shall consolidate with or merge into another Person
or convey, transfer or lease its properties and assets substantially as an
entirety to any Person, the corporation formed by such consolidation or into
which the Corporation is merged or the Person that acquires by conveyance or
transfer, or that leases, the properties and assets of the Corporation
substantially as an entirety shall be a corporation, partnership or trust
organized and existing under the laws of the United States of America or any
State thereof or the District of Columbia and shall expressly assume, by an
indenture supplemental hereto, executed and delivered to the Trustee, in form
satisfactory to the Trustee, the due and punctual payment of the principal of
(and premium, if any) and interest (including any Additional Interest) on all
the Securities of every series and the performance of every covenant of this
Indenture on the part of the Corporation to be performed or observed;

     (2) immediately after giving effect to such transaction, no Event of
Default, and no event that, after notice or lapse of time, or both, would
constitute an Event of Default, shall have happened and be continuing; and

     (3) the Corporation shall have delivered to the Trustee an Officers'
Certificate and an Opinion of Counsel, each stating that such consolidation,
merger, conveyance, transfer or lease and any such supplemental indenture comply
with this Article and that all conditions precedent herein provided for relating
to such transaction have been complied with; and the Trustee, subject to Section
6.1, may rely upon such Officers' Certificate and Opinion of Counsel as
conclusive evidence that such transaction complies with this Section 8.1.

     Section 8.2.  Successor Corporation Substituted.

     Upon any consolidation or merger by the Corporation with or into any other
Person, or any conveyance, transfer or lease by the Corporation of its
properties and assets substantially as an entirety to any Person in accordance
with Section 8.1, the successor corporation formed by such consolidation or into
which the Corporation is merged or to which such conveyance, transfer or lease
is made shall succeed to, and be substituted for, and may exercise every right
and power of, the Corporation under this Indenture with the same effect as if
such successor Person had been named as the Corporation herein; and in the event
of any such conveyance, transfer or lease the Corporation shall be discharged
from all obligations and covenants under the Indenture and the Securities.

     Such successor Person may cause to be executed, and may issue either in its
own name or in the name of the Corporation, any or all of the Securities
issuable hereunder that theretofore shall not have been signed by the
Corporation and delivered to the Trustee; and, upon the order of such successor
Person instead of the Corporation and subject to all the terms, conditions and
limitations in this Indenture prescribed, the Trustee shall authenticate and
shall deliver any Securities that previously shall have been signed and
delivered by the officers of the Corporation to the Trustee for authentication
pursuant to such provisions and any Securities that such successor Person
thereafter shall cause to be executed and delivered to the Trustee on its behalf
for the purpose pursuant to such provisions. All the Securities so issued shall
in all respects have the same legal rank and benefit under this Indenture as the
Securities theretofore or thereafter issued in accordance with the terms of this
Indenture.

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<PAGE>
 
     In case of any such consolidation, merger, sale, conveyance or lease, such
changes in phraseology and form may be made in the Securities thereafter to be
issued as may be appropriate.


                                  ARTICLE IX

                            Supplemental Indentures

     Section 9.1.  Supplemental Indentures without Consent of Holders.

     Without the consent of any Holders, the Corporation, when authorized by a
Board Resolution, and the Trustee, at any time and from time to time, may enter
into one or more indentures supplemental hereto, in form satisfactory to the
Trustee, for any of the following purposes:

          (1) to evidence the succession of another Person to the Corporation,
     and the assumption by any such successor of the covenants of the
     Corporation herein and in the Securities contained; or

          (2) to convey, transfer, assign, mortgage or pledge any property to or
     with the Trustee or to surrender any right or power herein conferred upon
     the Corporation; or

          (3) to establish the form or terms of Securities of any series as
     permitted by Sections 2.1 or 3.1; or

          (4) to add to the covenants of the Corporation for the benefit of the
     Holders of all or any series of Securities (and if such covenants are to be
     for the benefit of less than all series of Securities, stating that such
     covenants are expressly being included solely for the benefit of the series
     specified) or to surrender any right or power herein conferred upon the
     Corporation; or

          (5) to add any additional Events of Default for the benefit of the
     Holders of all or any series of Securities (and if such additional Events
     of Default are to be for the benefit of less than all series of Securities,
     stating that such additional Events of Default are expressly being included
     solely for the benefit of the series specified); or

          (6) to change or eliminate any of the provisions of this Indenture,
     provided that any such change or elimination shall (a) become effective
     only when there is no Security Outstanding of any series created prior to
     the execution of such supplemental indenture that is entitled to the
     benefit of such provision or (b) not apply to any Outstanding Securities;
     or

          (7) to cure any ambiguity, to correct or supplement any provision
     herein that may be defective or inconsistent with any other provision
     herein, or to make any other provisions with respect to matters or
     questions arising under this Indenture, provided that such action pursuant
     to this clause (7) shall not adversely affect the interest of the Holders
     of Securities of any series in any material respect or, in the case of the
     Securities of a series issued to an Issuer Trust and for so long as any of
     the corresponding series of Preferred Securities issued by such Issuer
     Trust shall remain outstanding, the holders of such Preferred Securities;
     or

                                     -54-
<PAGE>
 
          (8) to evidence and provide for the acceptance of appointment
     hereunder by a successor Trustee with respect to the Securities of one or
     more series and to add to or change any of the provisions of this Indenture
     as shall be necessary to provide for or facilitate the administration of
     the trusts hereunder by more than one Trustee, pursuant to the requirements
     of Section 6.11(b); or

          (9) to comply with the requirements of the Commission in order to
     effect or maintain qualification of this Indenture under the Trust
     Indenture Act.

     Section 9.2.  Supplemental Indentures with Consent of Holders.

     With the consent of the Holders of not less than a majority in aggregate
principal amount of the Outstanding Securities of each series affected by such
supplemental indenture, by Act of said Holders delivered to the Corporation and
the Trustee, the Corporation, when authorized by a Board Resolution, and the
Trustee may enter into an indenture or indentures supplemental hereto for the
purpose of adding any provisions to or changing in any manner or eliminating any
of the provisions of this Indenture or of modifying in any manner the rights of
the Holders of Securities of such series under this Indenture; provided,
however, that no such supplemental indenture shall, without the consent of the
Holder of each Outstanding Security of each series affected thereby,

     (1) change the Stated Maturity of the principal of, or any installment of
interest (including any Additional Interest) on, any Security, or reduce the
principal amount thereof or the rate of interest thereon or any premium payable
upon the redemption thereof, or reduce the amount of principal of a Discount
Security that would be due and payable upon a declaration of acceleration of the
Maturity thereof pursuant to Section 5.2, or change the place of payment where,
or the coin or currency in which, any Security or interest thereon is payable,
or impair the right to institute suit for the enforcement of any such payment on
or after the Stated Maturity thereof (or, in the case of redemption, on or after
the Redemption Date), or

     (2) reduce the percentage in aggregate principal amount of the Outstanding
Securities of any series, the consent of whose Holders is required for any such
supplemental indenture, or the consent of whose Holders is required for any
waiver (of compliance with certain provisions of this Indenture or certain
defaults hereunder and their consequences) provided for in this Indenture, or

     (3) modify any of the provisions of this Section, Section 5.13 or Section
10.5, except to increase any such percentage or to provide that certain other
provisions of this Indenture cannot be modified or waived without the consent of
the Holder of each Security affected thereby;

provided, further, that, in the case of the Securities of a series issued to an
Issuer Trust, so long as any of the corresponding series of Preferred Securities
issued by such Issuer Trust remains outstanding, (i) no such amendment shall be
made that adversely affects the holders of such Preferred Securities in any
material respect, and no termination of this Indenture shall occur, and no
waiver of any Event of Default or compliance with any covenant under this
Indenture shall be effective, without the prior consent of the holders of at
least a majority of the aggregate Liquidation Amount (as defined in the related
Trust Agreement) of such Preferred Securities then outstanding unless and until
the principal of (and premium, if any, on) the Securities of such series and all
accrued and (subject to Sections 3.8 and 3.12) unpaid interest (including any
Additional Interest) thereon have been paid in

                                     -55-
<PAGE>
 
full, and (ii) no amendment shall be made to Section 5.8 of this Indenture that
would impair the rights of the holders of Preferred Securities issued by any
Issuer Trust provided therein without the prior consent of the holders of each
such Preferred Security then outstanding unless and until the principal of (and
premium, if any, on) the Securities of such series and all accrued and (subject
to Sections 3.8 and 3.12) unpaid interest (including any Additional Interest)
thereon have been paid in full.

     A supplemental indenture that changes or eliminates any covenant or other
provision of this Indenture that has expressly been included solely for the
benefit of one or more particular series of Securities or any corresponding
series of Preferred Securities of an Issuer Trust that holds the Securities of
any series, or that modifies the rights of the Holders of Securities of such
series or holders of such Preferred Securities of such corresponding series with
respect to such covenant or other provision, shall be deemed not to affect the
rights under this Indenture of the Holders of Securities of any other series or
holders of Preferred Securities of any other such corresponding series.

     It shall not be necessary for any Act of Holders under this Section to
approve the particular form of any proposed supplemental indenture, but it shall
be sufficient if such Act shall approve the substance thereof.

     Section 9.3.  Execution of Supplemental Indentures.

     In executing or accepting the additional trusts created by any supplemental
indenture permitted by this Article or the modifications thereby of the trusts
created by this Indenture, the Trustee shall be entitled to receive, and
(subject to Section 6.1) shall be fully protected in relying upon, an Officers'
Certificate and an Opinion of Counsel stating that the execution of such
supplemental indenture is authorized or permitted by this Indenture, and that
all conditions precedent herein provided for relating to such action have been
complied with. The Trustee may, but shall not be obligated to, enter into any
such supplemental indenture that affects the Trustee's own rights, duties or
immunities under this Indenture or otherwise.

     Section 9.4.  Effect of Supplemental Indentures.

     Upon the execution of any supplemental indenture under this Article, this
Indenture shall be modified in accordance therewith, and such supplemental
indenture shall form a part of this Indenture for all purposes; and every Holder
of Securities theretofore or thereafter authenticated and delivered hereunder
shall be bound thereby.

     Section 9.5.  Conformity with Trust Indenture Act.

     Every supplemental indenture executed pursuant to this Article shall
conform to the requirements of the Trust Indenture Act as then in effect.

     Section 9.6.  Reference in Securities to Supplemental Indentures.

     Securities authenticated and delivered after the execution of any
supplemental indenture pursuant to this Article may, and shall if required by
the Corporation, bear a notation in form approved by the Corporation as to any
matter provided for in such supplemental indenture. If the

                                     -56-
<PAGE>
 
Corporation shall so determine, new Securities of any series so modified as to
conform, in the opinion of the Corporation, to any such supplemental indenture
may be prepared and executed by the Corporation and authenticated and delivered
by the Trustee in exchange for Outstanding Securities of such series.


                                   ARTICLE X

                                   Covenants

     Section 10.1. Payment of Principal, Premium and Interest.

     The Corporation covenants and agrees for the benefit of each series of
Securities that it will duly and punctually pay the principal of (and premium,
if any) and interest (including any Additional Interest) on the Securities of
that series in accordance with the terms of such Securities and this Indenture.

     Section 10.2. Maintenance of Office or Agency.

     The Corporation will maintain in each Place of Payment for any series of
Securities an office or agency where Securities of that series may be presented
or surrendered for payment, where Securities of that series may be surrendered
for registration of transfer or exchange and where notices and demands to or
upon the Corporation in respect of the Securities of that series and this
Indenture may be served. The Corporation initially appoints the Trustee, acting
through its Corporate Trust Office, as its agent for said purposes. The
Corporation will give prompt written notice to the Trustee of any change in the
location of any such office or agency. If at any time the Corporation shall fail
to maintain such office or agency or shall fail to furnish the Trustee with the
address thereof, such presentations, surrenders, notices and demands may be made
or served at the Corporate Trust Office of the Trustee, and the Corporation
hereby appoints the Trustee as its agent to receive all such presentations,
surrenders, notices and demands.

     The Corporation may also from time to time designate one or more other
offices or agencies where the Securities may be presented or surrendered for any
or all of such purposes, and may from time to time rescind such designations;
provided, however, that no such designation or rescission shall in any manner
relieve the Corporation of its obligation to maintain an office or agency in
each Place of Payment for Securities of any series for such purposes. The
Corporation will give prompt written notice to the Trustee of any such
designation and any change in the location of any such office or agency.

     Section 10.3. Money for Security Payments to be Held in Trust.

     If the Corporation shall at any time act as its own Paying Agent with
respect to any series of Securities, it will, on or before each due date of the
principal of (and premium, if any) or interest (including any Additional
Interest) on any of the Securities of such series, segregate and hold in trust
for the benefit of the Persons entitled thereto a sum sufficient to pay the
principal (and premium, if any) or interest (including any Additional Interest)
so becoming due until such sums shall be paid to such Persons or otherwise
disposed of as herein provided, and will promptly notify the Trustee of its

                                     -57-
<PAGE>
 
failure so to act.

     Whenever the Corporation shall have one or more Paying Agents, it will,
prior to 10:00 a.m., New York City time, on each due date of the principal of
(or premium, if any) or interest (including any Additional Interest) on any
Securities, deposit with a Paying Agent a sum sufficient to pay the principal
(and premium, if any) or interest (including any Additional Interest) so
becoming due, such sum to be held in trust for the benefit of the Persons
entitled to such principal (and premium, if any) or interest (including any
Additional Interest), and (unless such Paying Agent is the Trustee) the
Corporation will promptly notify the Trustee of its failure so to act.

     The Corporation will cause each Paying Agent other than the Trustee to
execute and deliver to the Trustee an instrument in which such Paying Agent
shall agree with the Trustee, subject to the provisions of this Section, that
such Paying Agent will:

          (1) hold all sums held by it for the payment of the principal of (and
     premium, if any) or interest (including any Additional Interest) on the
     Securities of a series in trust for the benefit of the Persons entitled
     thereto until such sums shall be paid to such Persons or otherwise disposed
     of as herein provided;

          (2) give the Trustee notice of any default by the Corporation (or any
     other obligor upon such Securities) in the making of any payment of
     principal (and premium, if any) or interest (including any Additional
     Interest) in respect of any Security of any series;

          (3) at any time during the continuance of any default with respect to
     a series of Securities, upon the written request of the Trustee, forthwith
     pay to the Trustee all sums so held in trust by such Paying Agent with
     respect to such series; and

          (4) comply with the provisions of the Trust Indenture Act applicable
     to it as a Paying Agent.

     The Corporation may at any time, for the purpose of obtaining the
satisfaction and discharge of this Indenture or for any other purpose, pay, or
by Corporation Order direct any Paying Agent to pay, to the Trustee all sums
held in trust by the Corporation or such Paying Agent, such sums to be held by
the Trustee upon the same trusts as those upon which such sums were held by the
Corporation or such Paying Agent; and, upon such payment by any Paying Agent to
the Trustee, such Paying Agent shall be released from all further liability with
respect to such money.

     Any money deposited with the Trustee or any Paying Agent, or then held by
the Corporation in trust for the payment of the principal of (and premium, if
any) or interest (including any Additional Interest) on any Security and
remaining unclaimed for two years after such principal (and premium, if any) or
interest (including any Additional Interest) has become due and payable shall
(unless otherwise required by mandatory provision of applicable escheat or
abandoned or unclaimed property law) be paid on Corporation Request to the
Corporation, or (if then held by the Corporation) shall (unless otherwise
required by mandatory provision of applicable escheat or abandoned or unclaimed
property law) be discharged from such trust; and the Holder of such Security
shall thereafter, as an unsecured general creditor, look only to the Corporation
for payment thereof, and all liability of the Trustee or such Paying Agent with
respect to such trust money, and all liability of the Corporation as

                                     -58-
<PAGE>
 
trustee thereof, shall thereupon cease; provided, however, that the Trustee or
such Paying Agent, before being required to make any such repayment, may at the
expense of the Corporation cause to be published once, in a newspaper published
in the English language, customarily published on each Business Day and of
general circulation in the Borough of Manhattan, The City of New York, notice
that such money remains unclaimed and that, after a date specified therein,
which shall not be less than 30 days from the date of such publication, any
unclaimed balance of such money then remaining will be repaid to the
Corporation.

     Section 10.4. Statement as to Compliance.

     The Corporation shall deliver to the Trustee, within 120 days after the end
of each fiscal year of the Corporation ending after the date hereof, an
Officers' Certificate covering the preceding calendar year, stating whether or
not to the best knowledge of the signers thereof the Corporation is in default
in the performance, observance or fulfillment of or compliance with any of the
terms, provisions, covenants and conditions of this Indenture, and if the
Corporation shall be in default, specifying all such defaults and the nature and
status thereof of which they may have knowledge. For the purpose of this Section
10.4, compliance shall be determined without regard to any grace period or
requirement of notice provided pursuant to the terms of this Indenture.

     Section 10.5. Waiver of Certain Covenants.

     Subject to the rights of holders of Preferred Securities specified in
Section 9.2, if any, the Corporation may omit in any particular instance to
comply with any covenant or condition provided pursuant to Section 3.1, 9.1(3)
or 9.1(4) with respect to the Securities of any series, if before or after the
time for such compliance the Holders of at least a majority in aggregate
principal amount of the Outstanding Securities of such series shall, by Act of
such Holders, either waive such compliance in such instance or generally waive
compliance with such covenant or condition, but no such waiver shall extend to
or affect such covenant or condition except to the extent so expressly waived,
and, until such waiver shall become effective, the obligations of the
Corporation in respect of any such covenant or condition shall remain in full
force and effect.

     Section 10.6. Additional Sums.

     In the case of the Securities of a series initially issued to an Issuer
Trust, so long as no Event of Default has occurred and is continuing and except
as otherwise specified as contemplated by Section 2.1 or Section 3.1, if (i) an
Issuer Trust is the Holder of all of the Outstanding Securities of such series,
and (ii) a Tax Event has occurred and is continuing in respect of such Issuer
Trust, the Corporation shall pay to such Issuer Trust (and its permitted
successors or assigns under the related Trust Agreement) for so long as such
Issuer Trust (or its permitted successor or assignee) is the registered holder
of the Outstanding Securities of such series, such additional sums as may be
necessary in order that the amount of Distributions (including any Additional
Amounts (as defined in such Trust Agreement)) then due and payable by such
Issuer Trust on the related Preferred Securities and Common Securities that at
any time remain outstanding in accordance with the terms thereof shall not be
reduced as a result of any Additional Taxes arising from such Tax Event (the
"Additional Sums"). Whenever in this Indenture or the Securities there is a
reference in any context to the payment of principal of or interest on the
Securities, such mention shall be deemed to include mention of the payments of
the Additional Sums provided for in this paragraph to the extent that, in such

                                     -59-
<PAGE>
 
context, Additional Sums are, were or would be payable in respect thereof
pursuant to the provisions of this paragraph and express mention of the payment
of Additional Sums (if applicable) in any provisions hereof shall not be
construed as excluding Additional Sums in those provisions hereof where such
express mention is not made; provided, however, that the deferral of the payment
of interest pursuant to Section 3.12 or the Securities shall not defer the
payment of any Additional Sums that may be due and payable.

     Section 10.7. Additional Covenants.

     The Corporation covenants and agrees with each Holder of Securities of each
series that it shall not (x) declare or pay any dividends or distributions on,
redeem, purchase, acquire or make a liquidation payment with respect to, any
shares of the Corporation's capital stock, or (y) make any payment of principal
of or interest or premium, if any, on or repay, repurchase or redeem any debt
securities of the Corporation that rank pari passu in all respects with or
junior in interest to the Securities of such series (other than (a) repurchases,
redemptions or other acquisitions of shares of capital stock of the Corporation
in connection with any employment contract, benefit plan or other similar
arrangement with or for the benefit of any one or more employees, officers,
directors or consultants, in connection with a dividend reinvestment or
stockholder stock purchase plan or in connection with the issuance of capital
stock of the Corporation (or securities convertible into or exercisable for such
capital stock) as consideration in an acquisition transaction entered into prior
to the applicable Extension Period, (b) as a result of an exchange or conversion
of any class or series of the Corporation's capital stock (or any capital stock
of a Subsidiary of the Corporation) for any class or series of the Corporation's
capital stock or of any class or series of the Corporation's indebtedness for
any class or series of the Corporation's capital stock, (c) the purchase of
fractional interests in shares of the Corporation's capital stock pursuant to
the conversion or exchange provisions of such capital stock or the security
being converted or exchanged, (d) any declaration of a dividend in connection
with any Rights Plan, or the issuance of rights, stock or other property under
any Rights Plan, or the redemption or repurchase of rights pursuant thereto, or
(e) any dividend in the form of stock, warrants, options or other rights where
the dividend stock or the stock issuable upon exercise of such warrants, options
or other rights is the same stock as that on which the dividend is being paid or
ranks pari passu with or junior to such stock) if at such time (i) there shall
have occurred any event (A) of which the Corporation has actual knowledge that
with the giving of notice or the lapse of time, or both, would constitute an
Event of Default with respect to the Securities of such series, and (B) which
the Corporation shall not have taken reasonable steps to cure, (ii) if the
Securities of such series are held by an Issuer Trust, the Corporation shall be
in default with respect to its payment of any obligations under the Guarantee
Agreement relating to the Preferred Securities issued by such Issuer Trust, or
(iii) the Corporation shall have given notice of its election to begin an
Extension Period with respect to the Securities of such series as provided
herein and shall not have rescinded such notice, or such Extension Period, or
any extension thereof, shall be continuing.

     The Corporation also covenants with each Holder of Securities of a series
issued to an Issuer Trust (i) to hold, directly or indirectly, 100% of the
Common Securities of such Issuer Trust, provided that any permitted successor of
the Corporation hereunder may succeed to the Corporation's ownership of such
Common Securities, (ii) as holder of such Common Securities, not to voluntarily
terminate, wind-up or liquidate such Issuer Trust, other than (a) in connection
with a distribution of the Securities of such series to the holders of the
related Preferred Securities in liquidation of such Issuer Trust, or (b) in
connection with certain mergers, consolidations or amalgamations permitted by

                                     -60-
<PAGE>
 
the related Trust Agreement, and (iii) to use its reasonable efforts, consistent
with the terms and provisions of such Trust Agreement, to cause such Issuer
Trust to continue not to be taxable as a corporation for United States federal
income tax purposes.

     Section 10.8. Original Issue Discount.

     For each year during which any Securities that were issued with original
issue discount are Outstanding, the Corporation shall furnish to each Paying
Agent in a timely fashion such information as may be reasonably requested by
each Paying Agent in order that each Paying Agent may prepare the information
which it is required to report for such year on Internal Revenue Service Forms
1096 and 1099 pursuant to Section 6049 of the Internal Revenue Code of 1986, as
amended.  Such information shall include the amount of original issue discount
includible in income for each $25 of principal amount at Stated Maturity of
outstanding Securities during such year.


                                  ARTICLE XI

                           Redemption of Securities

     Section 11.1  Applicability of This Article.

     Redemption of Securities of any series (whether by operation of a sinking
fund or otherwise) as permitted or required by any form of Security issued
pursuant to this Indenture shall be made in accordance with such form of
Security and this Article; provided, however, that if any provision of any such
form of Security shall conflict with any provision of this Article, the
provision of such form of Security shall govern. Except as otherwise set forth
in the form of Security for such series, each Security of a series shall be
subject to partial redemption only in the amount of $25 or any integral
multiples thereof.

     Section 11.2. Election to Redeem; Notice to Trustee.

     The election of the Corporation to redeem any Securities shall be evidenced
by or pursuant to a Board Resolution. In case of any redemption at the election
of the Corporation, the Corporation shall, at least 45 days prior to the
Redemption Date (unless a shorter notice shall be satisfactory to the Trustee),
notify the Trustee and, in the case of Securities of a series held by an Issuer
Trust, the Property Trustee under the related Trust Agreement, of such date and
of the principal amount of Securities of the applicable series to be redeemed
and provide the additional information required to be included in the notice or
notices contemplated by Section 11.4; provided that in the case of any series of
Securities initially issued to an Issuer Trust, for so long as such Securities
are held by such Issuer Trust, such notice shall be given not less than 45 nor
more than 75 days prior to such Redemption Date (unless a shorter notice shall
be satisfactory to the Property Trustee under the related Trust Agreement). In
the case of any redemption of Securities prior to the expiration of any
restriction on such redemption provided in the terms of such Securities, the
Corporation shall furnish the Trustee with an Officers' Certificate and an
Opinion of Counsel evidencing compliance with such restriction.

                                     -61-
<PAGE>
 
     Section 11.3. Selection of Securities to be Redeemed.

     If less than all the Securities of any series are to be redeemed, the
particular Securities to be redeemed shall be selected not more than 60 days
prior to the Redemption Date by the Trustee, from the Outstanding Securities of
such series not previously called for redemption, by such method as the Trustee
shall deem fair and appropriate and which may provide for the selection for
redemption of a portion of the principal amount of any Security of such series,
provided that the unredeemed portion of the principal amount of any Security
shall be in an authorized denomination (which shall not be less than the minimum
authorized denomination) for such Security.

     The Trustee shall promptly notify the Corporation in writing of the
Securities selected for partial redemption and the principal amount thereof to
be redeemed. For all purposes of this Indenture, unless the context otherwise
requires, all provisions relating to the redemption of Securities shall relate,
in the case of any Security redeemed or to be redeemed only in part, to the
portion of the principal amount of such Security that has been or is to be
redeemed.

     Section 11.4. Notice of Redemption.

     Notice of redemption shall be given by first-class mail, postage prepaid,
mailed not later than the thirtieth day, and not earlier than the sixtieth day,
prior to the Redemption Date, to each Holder of Securities to be redeemed, at
the address of such Holder as it appears in the Securities Register, provided
that in the case of any series of Securities initially issued to an Issuer
Trust, for so long as such Securities are held by such Issuer Trust, such notice
shall be given not less than 45 nor more than 75 days prior to such Redemption
Date (unless a shorter notice shall be satisfactory to the Property Trustee
under the related Trust Agreement).

     With respect to Securities of each series to be redeemed, each notice of
redemption shall state:

     (a) the Redemption Date;

     (b) the Redemption Price or, if the Redemption Price cannot be calculated
prior to the time the notice is required to be sent, the estimate of the
Redemption Price together with a statement that it is an estimate and that the
actual Redemption Price will be calculated on the third Business Day prior to
the Redemption Date (and if an estimate is provided, a further notice shall be
sent of the actual Redemption Price on the date that such Redemption Price is
calculated);

     (c) if less than all Outstanding Securities of such particular series are
to be redeemed, the identification (and, in the case of partial redemption, the
respective principal amounts) of the particular Securities to be redeemed;

     (d) that on the Redemption Date, the Redemption Price will become due and
payable upon each such Security or portion thereof, and that interest (including
any Additional Interest) thereon, if any, shall cease to accrue on and after
said date;

     (e) the place or places where such Securities are to be surrendered for
payment of the Redemption Price;

                                     -62-
<PAGE>
 
     (f) that the redemption is for a sinking fund, if such is the case;

     (g) such other provisions as may be required in respect of the terms of a
particular series of Securities.

     Notice of redemption of Securities to be redeemed at the election of the
Corporation shall be given by the Corporation or, at the Corporation's request,
by the Trustee in the name and at the expense of the Corporation and shall be
irrevocable. The notice if mailed in the manner provided above shall be
conclusively presumed to have been duly given, whether or not the Holder
receives such notice. In any case, a failure to give such notice by mail or any
defect in the notice to the Holder of any Security designated for redemption as
a whole or in part shall not affect the validity of the proceedings for the
redemption of any other Security.

     Section 11.5. Deposit of Redemption Price.

     Prior to 10:00 a.m., New York City time, on the Redemption Date specified
in the notice of redemption given as provided in Section 11.4, the Corporation
will deposit with the Trustee or with one or more Paying Agents (or if the
Corporation is acting as its own Paying Agent, the Corporation will segregate
and hold in trust as provided in Section 10.3) an amount of money sufficient to
pay the Redemption Price of, with any accrued interest (including any Additional
Interest) on, all the Securities (or portions thereof) that are to be redeemed
on that date.

     Section 11.6. Payment of Securities Called for Redemption.

     If any notice of redemption has been given as provided in Section 11.4, the
Securities or portion of Securities with respect to which such notice has been
given shall become due and payable on the date and at the place or places stated
in such notice at the applicable Redemption Price, together with accrued
interest (including any Additional Interest) to the Redemption Date. On
presentation and surrender of such Securities at a Place of Payment in said
notice specified, the said Securities or the specified portions thereof shall be
paid and redeemed by the Corporation at the applicable Redemption Price,
together with accrued interest (including any Additional Interest) to the
Redemption Date; provided, however, that, unless otherwise specified as
contemplated by Section 3.1, installments of interest (including any Additional
Interest) whose Stated Maturity is on or prior to the Redemption Date will be
payable to the Holders of such Securities, or one or more Predecessor
Securities, registered as such at the close of business on the relevant record
dates according to their terms and the provisions of Section 3.8.

     Upon presentation of any Security redeemed in part only, the Corporation
shall execute and the Trustee shall authenticate and deliver to the Holder
thereof, at the expense of the Corporation, a new Security or Securities of the
same series, of authorized denominations, in an aggregate principal amount equal
to the unredeemed portion of the Security so presented and having the same
Original Issue Date, Stated Maturity and terms.

     If any Security called for redemption shall not be so paid upon surrender
thereof for redemption, the principal of and premium, if any, on such Security
shall, until paid, bear interest from the Redemption Date at the rate prescribed
therefor in the Security.

                                     -63-
<PAGE>
 
     Section 11.7. Right of Redemption of Securities Initially Issued to an
Issuer Trust.

     In the case of the Securities of a series initially issued to an Issuer
Trust, except as otherwise specified as contemplated by Section 3.1, the
Corporation, at its option and subject to receipt of the prior approval of the
Federal Reserve, if then required under applicable Federal Reserve capital
guidelines or policies, may redeem such Securities (i) on or after the date
specified in such Security, in whole at any time or in part from time to time,
or (ii) upon the occurrence and during the continuation of a Tax Event or a
Capital Treatment Event, at any time within 90 days following the occurrence and
during the continuation of such Tax Event or Capital Treatment Event, in whole
(but not in part), in each case at a Redemption Price of 100% unless specified
in such Security, together with accrued interest (including any Additional
Interest) to the Redemption Date.

     If less than all the Securities of any such series are to be redeemed, the
aggregate principal amount of such Securities remaining Outstanding after giving
effect to such redemption shall be sufficient to satisfy any provisions of the
Trust Agreement related to the Issuer Trust to which such Securities were
issued, including any requirement in such Trust Agreement as to the minimum
Liquidation Amount (as defined in such Trust Agreement) of Preferred Securities
that may be held by a holder of Preferred Securities thereunder.


                                  ARTICLE XII

                                 Sinking Funds

     Section 12.1. Applicability of Article.

     The provisions of this Article shall be applicable to any sinking fund for
the retirement of Securities of any series except as otherwise specified as
contemplated by Section 3.1 for such Securities.

     The minimum amount of any sinking fund payment provided for by the terms of
any Securities of any series is herein referred to as a "mandatory sinking fund
payment", and any sinking fund payment in excess of such minimum amount that is
permitted to be made by the terms of such Securities of any series is herein
referred to as an "optional sinking fund payment". If provided for by the terms
of any Securities of any series, the cash amount of any sinking fund payment may
be subject to reduction as provided in Section 12.2. Each sinking fund payment
shall be applied to the redemption of Securities of any series as provided for
by the terms of such Securities.

     Section 12.2. Satisfaction of Sinking Fund Payments with Securities.

     In lieu of making all or any part of a mandatory sinking fund payment with
respect to any Securities of a series in cash, the Corporation may at its
option, at any time no more than 16 months and no less than 45 days prior to the
date on which such sinking fund payment is due, deliver to the Trustee
Securities of such series (together with the unmatured coupons, if any,
appertaining thereto) theretofore purchased or otherwise acquired by the
Corporation, except Securities of such series that have been redeemed through
the application of mandatory or optional sinking fund payments pursuant to the
terms of the Securities of such series, accompanied by a Corporation Order
instructing the

                                     -64-
<PAGE>
 
Trustee to credit such obligations and stating that the Securities of such
series were originally issued by the Corporation by way of bona fide sale or
other negotiation for value; provided that the Securities to be so credited have
not been previously so credited. The Securities to be so credited shall be
received and credited for such purpose by the Trustee at the redemption price
for such Securities, as specified in the Securities so to be redeemed, for
redemption through operation of the sinking fund and the amount of such sinking
fund payment shall be reduced accordingly.

     Section 12.3. Redemption of Securities for Sinking Fund.

     Not less than 45 days prior to each sinking fund payment date for any
series of Securities, the Corporation will deliver to the Trustee an Officers'
Certificate specifying the amount of the next ensuing sinking fund payment for
such Securities pursuant to the terms of such Securities, the portion thereof,
if any, which is to be satisfied by payment of cash in the currency in which the
Securities of such series are payable (except as provided pursuant to Section
3.1) and the portion thereof, if any, that is to be satisfied by delivering and
crediting Securities pursuant to Section 12.2 and will also deliver to the
Trustee any Securities to be so delivered. Such Officers' Certificate shall be
irrevocable and upon its delivery the Corporation shall be obligated to make the
cash payment or payments therein referred to, if any, on or before the
succeeding sinking fund payment date. In the case of the failure of the
Corporation to deliver such Officers' Certificate (or, as required by this
Indenture, the Securities and coupons, if any, specified in such Officers'
Certificate) by the due date therefor, the sinking fund payment due on the
succeeding sinking fund payment date for such series shall be paid entirely in
cash and shall be sufficient to redeem the principal amount of the Securities of
such series subject to a mandatory sinking fund payment without the right to
deliver or credit securities as provided in Section 12.2 and without the right
to make the optional sinking fund payment with respect to such series at such
time.

     Any sinking fund payment or payments (mandatory or optional) made in cash
plus any unused balance of any preceding sinking fund payments made with respect
to the Securities of any particular series shall be applied by the Trustee (or
by the Corporation if the Corporation is acting as its own Paying Agent) on the
sinking fund payment date on which such payment is made (or, if such payment is
made before a sinking fund payment date, on the sinking fund payment date
immediately following the date of such payment) to the redemption of Securities
of such series at the Redemption Price specified in such Securities with respect
to the sinking fund. Any and all sinking fund moneys with respect to the
Securities of any particular series held by the Trustee (or if the Corporation
is acting as its own Paying Agent, segregated and held in trust as provided in
Section 10.3) on the last sinking fund payment date with respect to Securities
of such series and not held for the payment or redemption of particular
Securities of such series shall be applied by the Trustee (or by the Corporation
if the Corporation is acting as its own Paying Agent), together with other
moneys, if necessary, to be deposited (or segregated) sufficient for the
purpose, to the payment of the principal of the Securities of such series at
Maturity. The Trustee shall select the Securities to be redeemed upon such
sinking fund payment date in the manner specified in Section 11.3 and cause
notice of the redemption thereof to be given in the name of and at the expense
of the Corporation in the manner provided in Section 11.4. Such notice having
been duly given, the redemption of such Securities shall be made upon the terms
and in the manner stated in Section 11.6. On or before each sinking fund payment
date, the Corporation shall pay to the Trustee (or, if the Corporation is acting
as its own Paying Agent, the Corporation shall segregate and hold in trust as
provided in Section 10.3) in cash a sum in the currency in which Securities of
such series are payable (except as provided pursuant to

                                     -65-
<PAGE>
 
Section 3.1) equal to the principal (and premium, if any) and any interest
(including any Additional Interest) accrued to the Redemption Date for
Securities or portions thereof to be redeemed on such sinking fund payment date
pursuant to this Section 12.3.

     Neither the Trustee nor the Corporation shall redeem any Securities of a
series with sinking fund moneys or mail any notice of redemption of Securities
of such series by operation of the sinking fund for such series during the
continuance of a default in payment of interest, if any, on any Securities of
such series or of any Event of Default (other than an Event of Default occurring
as a consequence of this paragraph) with respect to the Securities of such
series, except that if the notice of redemption shall have been provided in
accordance with the provisions hereof, the Trustee (or the Corporation, if the
Corporation is then acting as its own Paying Agent) shall redeem such Securities
if cash sufficient for that purpose shall be deposited with the Trustee (or
segregated by the Corporation) for that purpose in accordance with the terms of
this Article XII. Except as aforesaid, any moneys in the sinking fund for such
series at the time when any such default or Event of Default shall occur and any
moneys thereafter paid into such sinking fund shall, during the continuance of
such default or Event of Default, be held as security for the payment of the
Securities and coupons, if any, of such series; provided, however, that in case
such default or Event of Default shall have been cured or waived herein, such
moneys shall thereafter be applied on the next sinking fund payment date for the
Securities of such series on which such moneys may be applied pursuant to the
provisions of this Section 12.3.


                                 ARTICLE XIII

                          Subordination of Securities

     Section 13.1. Securities Subordinate to Senior Indebtedness.

     The Corporation covenants and agrees, and each Holder of a Security, by its
acceptance thereof, likewise covenants and agrees, that, to the extent and in
the manner hereinafter set forth in this Article, the payment of the principal
of (and premium, if any) and interest (including any Additional Interest) on
each and all of the Securities of each and every series are hereby expressly
made subordinate and subject in right of payment to the prior payment in full of
all Senior Indebtedness.

     Section 13.2. No Payment When Senior Indebtedness in Default; Payment Over
of Proceeds Upon Dissolution, Etc.

     If the Corporation shall default in the payment of any principal of (or
premium, if any) or interest on any Senior Indebtedness when the same becomes
due and payable, whether at maturity or at a date fixed for prepayment or by
declaration of acceleration or otherwise, then, upon written notice of such
default to the Corporation by the holders of Senior Indebtedness or any trustee
therefor, unless and until such default shall have been cured or waived or shall
have ceased to exist, no direct or indirect payment (in cash, property,
securities, by set-off or otherwise) shall be made or agreed to be made on
account of the principal of (or premium, if any) or interest (including any
Additional Interest) on any of the Securities, or in respect of any redemption,
repayment, retirement, purchase or other acquisition of any of the Securities.

                                     -66-
<PAGE>
 
     In the event of (a) any insolvency, bankruptcy, receivership, liquidation,
reorganization, readjustment, composition or other similar proceedings relating
to the Corporation, its creditors or its property, (b) any proceeding for the
liquidation, dissolution or other winding up of the Corporation, voluntary or
involuntary, whether or not involving insolvency or bankruptcy proceedings, (c)
any assignment by the Corporation for the benefit of creditors or (d) any other
marshalling of the assets of the Corporation (each such event, if any, herein
sometimes referred to as a "Proceeding"), all Senior Indebtedness (including any
interest thereon accruing after the commencement of any such proceedings) shall
first be paid in full before any payment or distribution, whether in cash,
securities or other property, shall be made to any Holder of any of the
Securities on account thereof. Any payment or distribution, whether in cash,
securities or other property (other than securities of the Corporation or any
other corporation provided for by a plan of reorganization or readjustment the
payment of which is subordinate, at least to the extent provided in these
subordination provisions with respect to the indebtedness evidenced by the
Securities, to the payment of all Senior Indebtedness at the time outstanding
and to any securities issued in respect thereof under any such plan of
reorganization or readjustment), which would otherwise (but for these
subordination provisions) be payable or deliverable in respect of the Securities
of any series shall be paid or delivered directly to the holders of Senior
Indebtedness in accordance with the priorities then existing among such holders
until all Senior Indebtedness (including any interest thereon accruing after the
commencement of any Proceeding) shall have been paid in full.

     In the event of any Proceeding, after payment in full of all sums owing
with respect to Senior Indebtedness, the Holders of the Securities, together
with the holders of any obligations of the Corporation ranking on a parity with
the Securities, shall be entitled to be paid from the remaining assets of the
Corporation the amounts at the time due and owing on account of unpaid principal
of (and premium, if any) and interest on the Securities and such other
obligations before any payment or other distribution, whether in cash, property
or otherwise, shall be made on account of any capital stock or any obligations
of the Corporation ranking junior to the Securities and such other obligations.
If, notwithstanding the foregoing, any payment or distribution of any character
or any security, whether in cash, securities or other property (other than
securities of the Corporation or any other corporation provided for by a plan of
reorganization or readjustment the payment of which is subordinate, at least to
the extent provided in these subordination provisions with respect to the
indebtedness evidenced by the Securities, to the payment of all Senior
Indebtedness at the time outstanding and to any securities issued in respect
thereof under any such plan of reorganization or readjustment), shall be
received by the Trustee or any Holder in contravention of any of the terms
hereof and before all Senior Indebtedness shall have been paid in full, such
payment or distribution or security shall be received in trust for the benefit
of, and shall be paid over or delivered and transferred to, the holders of the
Senior Indebtedness at the time outstanding in accordance with the priorities
then existing among such holders for application to the payment of all Senior
Indebtedness remaining unpaid, to the extent necessary to pay all such Senior
Indebtedness in full. In the event of the failure of the Trustee or any Holder
to endorse or assign any such payment, distribution or security, each holder of
Senior Indebtedness is hereby irrevocably authorized to endorse or assign the
same.

     The Trustee and the Holders shall take such action (including, without
limitation, the delivery of this Indenture to an agent for the holders of Senior
Indebtedness or consent to the filing of a financing statement with respect
hereto) as may, in the opinion of counsel designated by the holders of a
majority in principal amount of the Senior Indebtedness at the time outstanding,
be necessary or

                                     -67-
<PAGE>
 
appropriate to assure the effectiveness of the subordination effected by these
provisions.

     The provisions of this Section 13.2 shall not impair any rights, interests,
remedies or powers of any secured creditor of the Corporation in respect of any
security interest the creation of which is not prohibited by the provisions of
this Indenture.

     The securing of any obligations of the Corporation, otherwise ranking on a
parity with the Securities or ranking junior to the Securities, shall not be
deemed to prevent such obligations from constituting, respectively, obligations
ranking on a parity with the Securities or ranking junior to the Securities.

     Section 13.3. Payment Permitted If No Default.

     Nothing contained in this Article or elsewhere in this Indenture or in any
of the Securities shall prevent (a) the Corporation, at any time, except during
the pendency of the conditions described in the first paragraph of Section 13.2
or of any Proceeding referred to in Section 13.2, from making payments at any
time of principal of (and premium, if any) or interest (including any Additional
Interest) on the Securities, or (b) the application by the Trustee of any moneys
deposited with it hereunder to the payment of or on account of the principal of
(and premium, if any) or interest (including any Additional Interest) on the
Securities or the retention of such payment by the Holders, if, at the time of
such application by the Trustee, it did not have knowledge that such payment
would have been prohibited by the provisions of this Article.

     Section 13.4. Subrogation to Rights of Holders of Senior Indebtedness.

     Subject to the payment in full of all amounts due or to become due on all
Senior Indebtedness, or the provision for such payment in cash or cash
equivalents or otherwise in a manner satisfactory to the holders of Senior
Indebtedness, the Holders of the Securities shall be subrogated to the extent of
the payments or distributions made to the holders of such Senior Indebtedness
pursuant to the provisions of this Article (equally and ratably with the holders
of all indebtedness of the Corporation that by its express terms is subordinated
to Senior Indebtedness of the Corporation to substantially the same extent as
the Securities are subordinated to the Senior Indebtedness and is entitled to
like rights of subrogation by reason of any payments or distributions made to
holders of such Senior Indebtedness) to the rights of the holders of such Senior
Indebtedness to receive payments and distributions of cash, property and
securities applicable to the Senior Indebtedness until the principal of (and
premium, if any) and interest (including any Additional Interest) on the
Securities shall be paid in full. For purposes of such subrogation, no payments
or distributions to the holders of the Senior Indebtedness of any cash, property
or securities to which the Holders of the Securities or the Trustee would be
entitled except for the provisions of this Article, and no payments over
pursuant to the provisions of this Article to the holders of Senior Indebtedness
by Holders of the Securities or the Trustee, shall, as among the Corporation,
its creditors other than holders of Senior Indebtedness, and the Holders of the
Securities, be deemed to be a payment or distribution by the Corporation to or
on account of the Senior Indebtedness.

     Section 13.5. Provisions Solely to Define Relative Rights.

     The provisions of this Article are and are intended solely for the purpose
of defining the

                                     -68-
<PAGE>
 
relative rights of the Holders of the Securities on the one hand and the holders
of Senior Indebtedness on the other hand. Nothing contained in this Article or
elsewhere in this Indenture or in the Securities is intended to or shall (a)
impair, as between the Corporation and the Holders of the Securities, the
obligations of the Corporation, which are absolute and unconditional, to pay to
the Holders of the Securities the principal of (and premium, if any) and
interest (including any Additional Interest) on the Securities as and when the
same shall become due and payable in accordance with their terms; or (b) affect
the relative rights against the Corporation of the Holders of the Securities and
creditors of the Corporation other than their rights in relation to the holders
of Senior Indebtedness; or (c) prevent the Trustee or the Holder of any Security
(or to the extent expressly provided herein, the holder of any Preferred
Security) from exercising all remedies otherwise permitted by applicable law
upon default under this Indenture, including filing and voting claims in any
Proceeding, subject to the rights, if any, under this Article of the holders of
Senior Indebtedness to receive cash, property and securities otherwise payable
or deliverable to the Trustee or such Holder.

     Section 13.6. Trustee to Effectuate Subordination.

     Each Holder of a Security by his or her acceptance thereof authorizes and
directs the Trustee on his or her behalf to take such action as may be necessary
or appropriate to acknowledge or effectuate the subordination provided in this
Article and appoints the Trustee his or her attorney-in-fact for any and all
such purposes.

     Section 13.7. No Waiver of Subordination Provisions.

     No right of any present or future holder of any Senior Indebtedness to
enforce subordination as herein provided shall at any time in any way be
prejudiced or impaired by any act or failure to act on the part of the
Corporation or by any act or failure to act, in good faith, by any such holder,
or by any noncompliance by the Corporation with the terms, provisions and
covenants of this Indenture, regardless of any knowledge thereof that any such
holder may have or be otherwise charged with.

     Without in any way limiting the generality of the immediately preceding
paragraph, the holders of Senior Indebtedness may, at any time and from to time,
without the consent of or notice to the Trustee or the Holders of the Securities
of any series, without incurring responsibility to such Holders of the
Securities and without impairing or releasing the subordination provided in this
Article or the obligations hereunder of such Holders of the Securities to the
holders of Senior Indebtedness, do any one or more of the following: (i) change
the manner, place or terms of payment or extend the time of payment of, or renew
or alter, Senior Indebtedness, or otherwise amend or supplement in any manner
Senior Indebtedness or any instrument evidencing the same or any agreement under
which Senior Indebtedness is outstanding; (ii) sell, exchange, release or
otherwise deal with any property pledged, mortgaged or otherwise securing Senior
Indebtedness; (iii) release any Person liable in any manner for the collection
of Senior Indebtedness; and (iv) exercise or refrain from exercising any rights
against the Corporation and any other Person.

     Section 13.8. Notice to Trustee.

     The Corporation shall give prompt written notice to the Trustee of any fact
known to the Corporation that would prohibit the making of any payment to or by
the Trustee in respect of the Securities. Notwithstanding the provisions of this
Article or any other provision of this Indenture, the

                                     -69-
<PAGE>
 
Trustee shall not be charged with knowledge of the existence of any facts that
would prohibit the making of any payment to or by the Trustee in respect of the
Securities, unless and until the Trustee shall have received written notice
thereof from the Corporation or a holder of Senior Indebtedness or from any
trustee, agent or representative therefor; provided, however, that if the
Trustee shall not have received the notice provided for in this Section at least
two Business Days prior to the date upon which by the terms hereof any monies
may become payable for any purpose (including, the payment of the principal of
(and premium, if any) or interest (including any Additional Interest) on any
Security), then, anything herein contained to the contrary notwithstanding, the
Trustee shall have full power and authority to receive such monies and to apply
the same to the purpose for which they were received and shall not be affected
by any notice to the contrary that may be received by it within two Business
Days prior to such date.

     Subject to the provisions of Section 6.1, the Trustee shall be entitled to
rely on the delivery to it of a written notice by a Person representing such
Person to be a holder of Senior Indebtedness (or a trustee or attorney-in-fact
therefor) to establish that such notice has been given by a holder of Senior
Indebtedness (or a trustee or attorney-in-fact therefor). In the event that the
Trustee determines in good faith that further evidence is required with respect
to the right of any Person as a holder of Senior Indebtedness to participate in
any payment or distribution pursuant to this Article, the Trustee may request
such Person to furnish evidence to the reasonable satisfaction of the Trustee as
to the amount of Senior Indebtedness held by such Person, the extent to which
such Person is entitled to participate in such payment or distribution and any
other facts pertinent to the rights of such Person under this Article, and if
such evidence is not furnished, the Trustee may defer any payment to such Person
pending judicial determination as to the right of such Person to receive such
payment.

     Section 13.9. Reliance on Judicial Order or Certificate of Liquidating
Agent.

     Upon any payment or distribution of assets of the Corporation referred to
in this Article, the Trustee, subject to the provisions of Section 6.1, and the
Holders of the Securities shall be entitled to rely upon any order or decree
entered by any court of competent jurisdiction in which such Proceeding is
pending, or a certificate of the trustee in bankruptcy, receiver, liquidating
trustee, custodian, assignee for the benefit of creditors, agent or other Person
making such payment or distribution, delivered to the Trustee or to the Holders
of Securities, for the purpose of ascertaining the Persons entitled to
participate in such payment or distribution, the holders of the Senior
Indebtedness and other indebtedness of the Corporation, the amount thereof or
payable thereon, the amount or amounts paid or distributed thereon and all other
facts pertinent thereto or to this Article.

     Section 13.10. Trustee Not Fiduciary for Holders of Senior Indebtedness.

     The Trustee, in its capacity as trustee under this Indenture, shall not be
deemed to owe any fiduciary duty to the holders of Senior Indebtedness and shall
not be liable to any such holders if it shall in good faith mistakenly pay over
or distribute to Holders of Securities or to the Corporation or to any other
Person cash, property or securities to which any holders of Senior Indebtedness
shall be entitled by virtue of this Article or otherwise.

                                     -70-
<PAGE>
 
     Section 13.11. Rights of Trustee as Holder of Senior Indebtedness;
Preservation of Trustee's Rights.

     The Trustee in its individual capacity shall be entitled to all the rights
set forth in this Article with respect to any Senior Indebtedness that may at
any time be held by it, to the same extent as any other holder of Senior
Indebtedness, and nothing in this Indenture shall deprive the Trustee of any of
its rights as such holder.

     Section 13.12. Article Applicable to Paying Agents.

     If at any time any Paying Agent other than the Trustee shall have been
appointed by the Corporation and be then acting hereunder, the term "Trustee" as
used in this Article shall in such case (unless the context otherwise requires)
be construed as extending to and including such Paying Agent within its meaning
as fully for all intents and purposes as if such Paying Agent were named in this
Article in addition to or in place of the Trustee.

                                    * * * *

                                     -71-
<PAGE>
 
     This instrument may be executed in any number of counterparts, each of
 which so executed shall be deemed to be an original, but all such counterparts
 shall together constitute but one and the same instrument.

     IN WITNESS WHEREOF, the parties hereto have caused this Indenture to be
duly executed, and their respective corporate seals to be hereunto affixed and
attested, all as of the day and year first above written.


                                        Northern Trust Corporation


                                        By:_______________________________
                                        Name:
                                        Title:



Attest: ________________________


                                        The First National Bank of Chicago,
                                        as Trustee


                                        By:_______________________________
                                        Name:
                                        Title:



Attest: ________________________
<PAGE>
 
State of                 )
                         ) ss.:
County of                )


     On the _____ day of January, 1997, before me personally came
________________, to me known, who, being by me duly sworn, did depose and say
that he/she is ____________________________ one of the corporations described in
and which executed the foregoing instrument; that he/she knows the seal of said
corporation; that the seal affixed to said instrument is such corporate seal;
that it was so affixed by authority of the Board of Directors of said
corporation; and that he/she signed his/her name thereto by like authority.



                                                    ____________________________




State of                 )
                         ) ss.:
County of                )


     On the _____ day of January, 1997, before me personally came
_________________, to me known, who, being by me duly sworn, did depose and say
that he/she is ____________________________ one of the corporations described in
and which executed the foregoing instrument; that he/she knows the seal of said
corporation; that the seal affixed to said instrument is such corporate seal;
that it was so affixed by authority of the Board of Directors of said
corporation; and that he/she signed his/her name thereto by like authority.



                                                    ____________________________

<PAGE>
 
                                                                   Exhibit 4 (c)

                                TRUST AGREEMENT
                                      OF
                                 NTC CAPITAL I


     THIS TRUST AGREEMENT is made as of December 27, 1996 (this "Trust
Agreement"), by and among Northern Trust Corporation, a Delaware corporation, as
Depositor (the "Depositor"), and First Chicago Delaware Inc., a Delaware 
corporation, as trustee ("First Chicago"), and Donald L. Raiff, as trustee 
(jointly, the "Trustees"). The Depositor and the Trustees hereby agree as 
follows:

     1.  The trust created hereby shall be known as "NTC Capital I" (the
"Trust"), in which name the Trustees or the Depositor, to the extent provided
herein, may conduct the business of the Trust, make and execute contracts, and
sue and be sued.

     2.   The Depositor hereby assigns, transfers, conveys and sets over to the
Trust the sum of $10. Such amount shall constitute the initial trust estate,
which will be held in trust for the Depositor. It is the intention of the
parties hereto that the Trust created hereby constitute a business trust under
Chapter 38 of Title 12 of the Delaware Code, 12 Del. C. (s) 3801, et seq. (the
"Business Trust Act"), and that this document constitute the governing
instrument of the Trust. The Trustees are hereby authorized and directed to
execute and file a certificate of trust with the Delaware Secretary of State in
such form as the Trustees may approve.

     3.   The Depositor and the Trustees will enter into an amended and restated
Trust Agreement or Trust Agreement satisfactory to each such party and
substantially in the form to be included as an exhibit to the Registration
Statement on Form S-3 (the "1933 Act Registration Statement") referred to below,
or in such other form as the Trustees and the Depositor may approve, to provide
for the contemplated operation of the Trust created hereby and the issuance of
the Preferred Securities and Common Securities referred to therein. Prior to
the execution and delivery of such amended and restated Trust Agreement or Trust
Agreement and the Trustees shall not have any duty or obligation hereunder or
with respect of the trust estate, except as otherwise required by applicable law
or as may be necessary to obtain prior to such execution and delivery any
licenses, consents or approvals required by applicable law or otherwise.
Notwithstanding the foregoing, the Trustees may take all actions deemed proper
as are necessary to effect the transactions contemplated herein.

     4.   The Depositor and the Trustees hereby authorize and direct the
Depositor, as the sponsor of the Trust, (i) to file with the Securities and
Exchange Commission (the "Commission") and to execute, in the case of the 1933
Act Registration Statement and 1934 Act Registration Statement (as herein
defined), on behalf of the Trust, (a) the 1933 Act Registration Statement,
including pre-effective or post-effective amendments to such Registration
Statement, relating to the registration under the Securities Act of 1933, as
amended (the "1933 Act"), of the Preferred Securities of the Trust, (b) any
preliminary prospectus or prospectus or supplement thereto relating to the
Preferred Securities required to be filed pursuant under the 1933 Act, and (c) a
Registration Statement on Form 8-A or other appropriate form (the "1934 Act
Registration

<PAGE>

Statement") (including all pre-effective and post-effective amendments thereto)
relating to the registration of the Preferred Securities of the Trust under the
Securities Exchange Act of 1934, as amended; (ii) to file with the New York
Stock Exchange and execute on behalf of the Trust a listing application and all
other applications, statements, certificates, agreements and other instruments
as shall be necessary or desirable to cause the Preferred Securities to be
listed on the New York Stock Exchange; (iii) to file and execute on behalf of
the Trust such applications, reports, surety bonds, irrevocable consents,
appointments of attorney for service of process and other papers and documents
as shall be necessary or desirable to register the Preferred Securities under
the securities or "Blue Sky" laws of such jurisdictions as the Depositor, on
behalf of the Trust, may deem necessary or desirable; and (iv) to execute,
deliver and perform on behalf of the Trust, an underwriting agreement with the
Depositor and the underwriter or underwriters of the Preferred Securities of the
Trust. In the event that any filing referred to in clauses (i)-(iii) above is
required by the rules and regulations of the Commission, the New York Stock
Exchange or state securities or Blue Sky laws to be executed on behalf of the
Trust by the Trustees, in their capacities as trustees of the Trust, the
Trustees, in their capacities as trustees of the Trust, are hereby authorized
and directed to join in any such filing and to execute on behalf of the Trust
any and all of the foregoing, it being understood that First Chicago, in its
capacity as trustee of the Trust, shall not be required to join in any such
filing or execute on behalf of the Trust any such document unless required by
the rules and regulations of the Commission, the New York Stock Exchange or
state securities or Blue Sky laws. In connection with all of the foregoing, the
Trustees, solely in their capacities as trustees as the Trust, and the Depositor
hereby constitute and appoint Donald L. Raiff as his or its, as the case may be,
true and lawful attorney-in-fact and agent, with full power of substitution and
resubstitution for the Depositor or the Depositor's name, place and stead, in
any and all capacities, to sign any and all amendments (including all pre-
effective and post-effective amendments) to the 1933 Act Registration Statement
and the 1934 Act Registration Statement and to file the same, with all exhibits
thereto, and any other documents in connection therewith, with the Commission,
granting unto said attorney-in-fact and agent full power and authority to do and
perform each and every act and thing requisite and necessary to be done in
connection therewith, as fully to all intents and purposes as the Depositor
might or could do in person, hereby ratifying and confirming all that said
attorney-in-fact and agent or his respective substitute or substitutes, shall do
or cause to be done by virtue hereof.

     5.  This Trust Agreement may be executed in one or more counterparts.

     6.  The number of trustees of the Trust initially shall be two and
thereafter the number of trustees of the Trust shall be such number as shall be
fixed from time to time by a written instrument signed by the Depositor which
may increase or decrease the number of trustees of the Trust; provided, however,
that to the extent required by the Business Trust Act, one trustee of the Trust
shall either be a natural person who is a resident of the State of Delaware or,
if not a natural person, an entity which has its principal place of business in
the State of Delaware. Subject to the foregoing, the Depositor is entitled to
appoint or remove without cause any trustee of the Trust at any time. Any
trustee of the Trust may resign upon thirty days' prior notice to the Depositor.

                                      -2-

<PAGE>
 
     7.  First Chicago, in its capacity as a trustee of the Trust, shall not 
have any of the powers and duties of the Trustees set forth herein and shall be 
a trustee of the Trust for the sole purpose of satisfying the requirements of 
Section 3807 of the Business Trust Act.

     8.  This Trust Agreement shall be governed by, and construed in accordance 
with, the laws of the State of Delaware (with regard to conflict of laws 
principles).

     IN WITNESS WHEREOF, the parties hereto have caused this Trust Agreement to 
be duly executed as of the day and year first above written.


                                            NORTHERN TRUST CORPORATION,
                                            as Depositor


                                            By:  /s/ Harry W. Short
                                                 -----------------------------
                                                 Name:   Harry W. Short
                                                 Title:  Senior Vice President



                                            FIRST CHICAGO DELAWARE INC.
                                            as Trustee



                                            By:  
                                                 -----------------------------
                                                 Name:
                                                 Title:



                                            /s/ Donald L. Raiff
                                            ----------------------------------
                                            Name:  Donald L. Raiff, as Trustee

                                      -3-



<PAGE>
 
                                                                   Exhibit 4 (e)

                                TRUST AGREEMENT
                                      OF
                                 NTC CAPITAL II


     THIS TRUST AGREEMENT is made as of December 27, 1996 (this "Trust
Agreement"), by and among Northern Trust Corporation, a Delaware corporation, as
Depositor (the "Depositor"), and First Chicago Delaware Inc., a Delaware
corporation, as trustee ("First Chicago"), and Donald L. Raiff, as trustee
(jointly, the "Trustees"). The Depositor and the Trustees hereby agree as
follows:

     1. The trust created hereby shall be known as "NTC Capital II" (the
"Trust"), in which name the Trustees or the Depositor, to the extent provided
herein, may conduct the business of the Trust, make and execute contracts, and
sue and be sued.

     2. The Depositor hereby assigns, transfers, conveys and sets over to the
Trust the sum of $10. Such amount shall constitute the initial trust estate,
which will be held in trust for the Depositor. It is the intention of the
parties hereto that the Trust created hereby constitute a business trust under
Chapter 38 of Title 12 of the Delaware Code, 12 Del. C. (s) 3801, et seq. (the
"Business Trust Act"), and that this document constitute the governing
instrument of the Trust. The Trustees are hereby authorized and directed to
execute and file a certificate of trust with the Delaware Secretary of State in
such form as the Trustees may approve.

     3. The Depositor and the Trustees will enter into an amended and restated
Trust Agreement or Trust Agreement satisfactory to each such party and
substantially in the form to be included as an exhibit to the Registration
Statement on Form S-3 (the "1933 Act Registration Statement") referred to below,
or in such other form as the Trustees and the Depositor may approve, to provide
for the contemplated operation of the Trust created hereby and the issuance of
the Preferred Securities and Common Securities referred to therein. Prior to the
execution and delivery of such amended and restated Trust Agreement or Trust
Agreement and the Trustees shall not have any duty or obligation hereunder or
with respect of the trust estate, except as otherwise required by applicable law
or as may be necessary to obtain prior to such execution and delivery any
licenses, consents or approvals required by applicable law or otherwise.
Notwithstanding the foregoing, the Trustees may take all actions deemed proper
as are necessary to effect the transactions contemplated herein.

     4.   The Depositor and the Trustees hereby authorize and direct the
Depositor, as the sponsor of the Trust, (i) to file with the Securities and
Exchange Commission (the "Commission") and to execute, in the case of the 1933
Act Registration Statement and 1934 Act Registration Statement (as herein
defined), on behalf of the Trust, (a) the 1933 Act Registration Statement,
including pre-effective or post-effective amendments to such Registration
Statement, relating to the registration under the Securities Act of 1933, as
amended (the "1933 Act"), of the Preferred Securities of the Trust, (b) any
preliminary prospectus or prospectus or supplement thereto relating to the
Preferred Securities required to be filed pursuant under the 1933 Act, and (c) a
Registration Statement on Form 8-A or other appropriate form (the "1934 Act
Registration


<PAGE>
Statement") (including all pre-effective and post-effective amendments thereto)
relating to the registration of the Preferred Securities of the Trust under the
Securities Exchange Act of 1934, as amended; (ii) to file with the New York
Stock Exchange and execute on behalf of the Trust a listing application and all
other applications, statements, certificates, agreements and other instruments
as shall be necessary or desirable to cause the Preferred Securities to be
listed on the New York Stock Exchange; (iii) to file and execute on behalf of
the Trust such applications, reports, surety bonds, irrevocable consents,
appointments of attorney for service of process and other papers and documents
as shall be necessary or desirable to register the Preferred Securities under
the securities or "Blue Sky" laws of such jurisdictions as the Depositor, on
behalf of the Trust, may deem necessary or desirable; and (iv) to execute,
deliver and perform on behalf of the Trust, an underwriting agreement with the
Depositor and the underwriter or underwriters of the Preferred Securities of the
Trust. In the event that any filing referred to in clauses (i)-(iii) above is
required by the rules and regulations of the Commission, the New York Stock
Exchange or state securities or Blue Sky laws to be executed on behalf of the
Trust by the Trustees, in their capacities as trustees of the Trust, the
Trustees, in their capacities as trustees of the Trust, are hereby authorized
and directed to join in any such filing and to execute on behalf of the Trust
any and all of the foregoing, it being understood that First Chicago, in its
capacity as trustee of the Trust, shall not be required to join in any such
filing or execute on behalf of the Trust any such document unless required by
the rules and regulations of the Commission, the New York Stock Exchange or
state securities or Blue Sky laws. In connection with all of the foregoing, the
Trustees, solely in their capacities as trustees as the Trust, and the Depositor
hereby constitute and appoint Donald L. Raiff as his or its, as the case may be,
true and lawful attorney-in-fact and agent, with full power of substitution and
resubstitution for the Depositor or the Depositor's name, place and stead, in
any and all capacities, to sign any and all amendments (including all pre-
effective and post-effective amendments) to the 1933 Act Registration Statement
and the 1934 Act Registration Statement and to file the same, with all exhibits
thereto, and any other documents in connection therewith, with the Commission,
granting unto said attorney-in-fact and agent full power and authority to do and
perform each and every act and thing requisite and necessary to be done in
connection therewith, as fully to all intents and purposes as the Depositor
might or could do in person, hereby ratifying and confirming all that said
attorney-in-fact and agent or his respective substitute or substitutes, shall do
or cause to be done by virtue hereof.

     5.  This Trust Agreement may be executed in one or more counterparts.

     6.  The number of trustees of the Trust initially shall be two and
thereafter the number of trustees of the Trust shall be such number as shall be
fixed from time to time by a written instrument signed by the Depositor which
may increase or decrease the number of trustees of the Trust; provided, however,
that to the extent required by the Business Trust Act, one trustee of the Trust
shall either be a natural person who is a resident of the State of Delaware or,
if not a natural person, an entity which has its principal place of business in
the State of Delaware. Subject to the foregoing, the Depositor is entitled to
appoint or remove without cause any trustee of the Trust at any time. Any
trustee of the Trust may resign upon thirty days' prior notice to the Depositor.

                                      -2-
<PAGE>
 
     7.  First Chicago, in its capacity as a trustee of the Trust, shall not 
have any of the powers and duties of the Trustees set forth herein and shall be 
a trustee of the Trust for the sole purpose of satisfying the requirements of 
Section 3807 of the Business Trust Act.

     8.  This Trust Agreement shall be governed by, and construed in accordance 
with, the laws of the State of Delaware (with regard to conflict of laws 
principles).

     IN WITNESS WHEREOF, the parties hereto have caused this Trust Agreement to 
be duly executed as of the day and year first above written.

                                            NORTHERN TRUST CORPORATION,
                                            as Depositor


                                            By:  /s/ Harry W. Short
                                                 -----------------------------
                                                 Name:   Harry W. Short
                                                 Title:  Senior Vice President



                                            FIRST CHICAGO DELAWARE INC.
                                            as Trustee



                                            By:  
                                                 -----------------------------
                                                 Name:
                                                 Title:



                                            /s/ Donald L. Raiff
                                            ----------------------------------
                                            Name:  Donald L. Raiff, as Trustee

                                      -3-


<PAGE>
 
                                                                   Exhibit 4 (g)

                                TRUST AGREEMENT
                                      OF
                                 NTC CAPITAL III


     THIS TRUST AGREEMENT is made as of December 27, 1996 (this "Trust
Agreement"), by and among Northern Trust Corporation, a Delaware corporation, as
Depositor (the "Depositor"), and First Chicago Delaware Inc., a Delaware
corporation, as trustee ("First Chicago"), and Donald L. Raiff, as trustee
(jointly, the "Trustees"). The Depositor and the Trustees hereby agree as
follows:

     1. The trust created hereby shall be known as "NTC Capital III" (the
"Trust"), in which name the Trustees or the Depositor, to the extent provided
herein, may conduct the business of the Trust, make and execute contracts, and
sue and be sued.

     2. The Depositor hereby assigns, transfers, conveys and sets over to the
Trust the sum of $10. Such amount shall constitute the initial trust estate,
which will be held in trust for the Depositor. It is the intention of the
parties hereto that the Trust created hereby constitute a business trust under
Chapter 38 of Title 12 of the Delaware Code, 12 Del. C. (s) 3801, et seq. (the
"Business Trust Act"), and that this document constitute the governing
instrument of the Trust. The Trustees are hereby authorized and directed to
execute and file a certificate of trust with the Delaware Secretary of State in
such form as the Trustees may approve.

     3. The Depositor and the Trustees will enter into an amended and restated
Trust Agreement or Trust Agreement satisfactory to each such party and
substantially in the form to be included as an exhibit to the Registration
Statement on Form S-3 (the "1933 Act Registration Statement") referred to below,
or in such other form as the Trustees and the Depositor may approve, to provide
for the contemplated operation of the Trust created hereby and the issuance of
the Preferred Securities and Common Securities referred to therein. Prior to
the execution and delivery of such amended and restated Trust Agreement or Trust
Agreement and the Trustees shall not have any duty or obligation hereunder or
with respect of the trust estate, except as otherwise required by applicable law
or as may be necessary to obtain prior to such execution and delivery any
licenses, consents or approvals required by applicable law or otherwise.
Notwithstanding the foregoing, the Trustees may take all actions deemed proper
as are necessary to effect the transactions contemplated herein.

     4. The Depositor and the Trustees hereby authorize and direct the
Depositor, as the sponsor of the Trust, (i) to file with the Securities and
Exchange Commission (the "Commission") and to execute, in the case of the 1933
Act Registration Statement and 1934 Act Registration Statement (as herein
defined), on behalf of the Trust, (a) the 1933 Act Registration Statement,
including pre-effective or post-effective amendments to such Registration
Statement, relating to the registration under the Securities Act of 1933, as
amended (the "1933 Act"), of the Preferred Securities of the Trust, (b) any
preliminary prospectus or prospectus or supplement thereto relating to the
Preferred Securities required to be filed pursuant under the 1933 Act, and (c) a
Registration Statement on Form 8-A or other appropriate form (the "1934 Act
Registration


<PAGE>

Statement") (including all pre-effective and post-effective amendments thereto)
relating to the registration of the Preferred Securities of the Trust under the
Securities Exchange Act of 1934, as amended; (ii) to file with the New York
Stock Exchange and execute on behalf of the Trust a listing application and all
other applications, statements, certificates, agreements and other instruments
as shall be necessary or desirable to cause the Preferred Securities to be
listed on the New York Stock Exchange; (iii) to file and execute on behalf of
the Trust such applications, reports, surety bonds, irrevocable consents,
appointments of attorney for service of process and other papers and documents
as shall be necessary or desirable to register the Preferred Securities under
the securities or "Blue Sky" laws of such jurisdictions as the Depositor, on
behalf of the Trust, may deem necessary or desirable; and (iv) to execute,
deliver and perform on behalf of the Trust, an underwriting agreement with the
Depositor and the underwriter or underwriters of the Preferred Securities of the
Trust. In the event that any filing referred to in clauses (i)-(iii) above is
required by the rules and regulations of the Commission, the New York Stock
Exchange or state securities or Blue Sky laws to be executed on behalf of the
Trust by the Trustees, in their capacities as trustees of the Trust, the
Trustees, in their capacities as trustees of the Trust, are hereby authorized
and directed to join in any such filing and to execute on behalf of the Trust
any and all of the foregoing, it being understood that First Chicago, in its
capacity as trustee of the Trust, shall not be required to join in any such
filing or execute on behalf of the Trust any such document unless required by
the rules and regulations of the Commission, the New York Stock Exchange or
state securities or Blue Sky laws. In connection with all of the foregoing, the
Trustees, solely in their capacities as trustees as the Trust, and the Depositor
hereby constitute and appoint Donald L. Raiff as his or its, as the case may be,
true and lawful attorney-in-fact and agent, with full power of substitution and
resubstitution for the Depositor or the Depositor's name, place and stead, in
any and all capacities, to sign any and all amendments (including all pre-
effective and post-effective amendments) to the 1933 Act Registration Statement
and the 1934 Act Registration Statement and to file the same, with all exhibits
thereto, and any other documents in connection therewith, with the Commission,
granting unto said attorney-in-fact and agent full power and authority to do and
perform each and every act and thing requisite and necessary to be done in
connection therewith, as fully to all intents and purposes as the Depositor
might or could do in person, hereby ratifying and confirming all that said
attorney-in-fact and agent or his respective substitute or substitutes, shall do
or cause to be done by virtue hereof.

     5.  This Trust Agreement may be executed in one or more counterparts.

     6.  The number of trustees of the Trust initially shall be two and
thereafter the number of trustees of the Trust shall be such number as shall be
fixed from time to time by a written instrument signed by the Depositor which
may increase or decrease the number of trustees of the Trust; provided, however,
that to the extent required by the Business Trust Act, one trustee of the Trust
shall either be a natural person who is a resident of the State of Delaware or,
if not a natural person, an entity which has its principal place of business in
the State of Delaware. Subject to the foregoing, the Depositor is entitled to
appoint or remove without cause any trustee of the Trust at any time. Any
trustee of the Trust may resign upon thirty days' prior notice to the Depositor.

                                      -2-

<PAGE>
 
     7.  First Chicago, in its capacity as a trustee of the Trust, shall not 
have any of the powers and duties of the Trustees set forth herein and shall be 
a trustee of the Trust for the sole purpose of satisfying the requirements of 
Section 3807 of the Business Trust Act.

     8.  This Trust Agreement shall be governed by, and construed in accordance 
with, the laws of the State of Delaware (with regard to conflict of laws 
principles).

     IN WITNESS WHEREOF, the parties hereto have caused this Trust Agreement to 
be duly executed as of the day and year first above written.


                                            NORTHERN TRUST CORPORATION,
                                            as Depositor


                                            By:  /s/ Harry W. Short
                                                 -----------------------------
                                                 Name:   Harry W. Short
                                                 Title:  Senior Vice President



                                            FIRST CHICAGO DELAWARE INC.
                                            as Trustee



                                            By:  
                                                 -----------------------------
                                                 Name:
                                                 Title:



                                            /s/ Donald L. Raiff
                                            ----------------------------------
                                            Name:  Donald L. Raiff, as Trustee

                                      -3-

<PAGE>
 
                                                                    EXHIBIT 4(h)



================================================================================


                     AMENDED AND RESTATED TRUST AGREEMENT

                                     AMONG


                          NORTHERN TRUST CORPORATION
                                 as Depositor


                      THE FIRST NATIONAL BANK OF CHICAGO,
                              as Property Trustee

                         FIRST CHICAGO DELAWARE INC.,
                              as Delaware Trustee

                                      and

                 AND THE ADMINISTRATIVE TRUSTEES NAMED HEREIN

                              ___________________


                         Dated as of January __, 1997


                              ___________________


                                 NTC CAPITAL I


================================================================================
<PAGE>
 
                                 NTC CAPITAL I

                        Certain Sections of this Trust
                             Agreement relating to
                        Sections 310 through 318 of the
                         Trust Indenture Act of 1939:

<TABLE>
<CAPTION>
Trust Indenture                                        Trust Agreement
Act Section                                                Section
- ---------------                                        ---------------
<S>                                                    <C>
  (S) 310  (a)(1)....................................  8.7

           (a)(2)....................................  8.7

           (a)(3)....................................  8.9

           (a)(4)....................................  2.7(a)(ii)

           (b).......................................  8.8

  (S) 311  (a).......................................  8.13

           (b).......................................  8.13

  (S) 312  (a).......................................  5.8

           (b).......................................  5.8

           (c).......................................  5.8

  (S) 313  (a).......................................  8.15(a)

           (a)(4)....................................  8.15(b)

           (b).......................................  8.15(b)

           (c).......................................  10.8

           (d).......................................  8.15(c)

  (S) 314  (a).......................................  8.16

           (b).......................................  Not Applicable

           (c)(1)....................................  8.17

           (c)(2)....................................  8.17

           (c)(3)....................................  Not Applicable

           (d).......................................  Not Applicable

           (e).......................................  1.1, 8.17

  (S) 315  (a).......................................  8.1(a), 8.3(a)

           (b).......................................  8.2, 10.8

           (c).......................................  8.1(a)

           (d).......................................  8.1, 8.3

           (e).......................................  Not Applicable

  (S) 316  (a).......................................  Not Applicable

           (a)(1)(A).................................  Not Applicable

           (a)(1)(B).................................  Not Applicable

           (a)(2)....................................  Not Applicable

           (b).......................................  5.15

           (c).......................................  6.7

  (S) 317  (a)(1)....................................  Not Applicable

           (a)(2)....................................  Not Applicable

           (b).......................................  5.10

  (S) 318  (a).......................................  10.10
</TABLE>

- ------------
Note: This reconciliation and tie sheet shall not, for any purpose, be deemed to
be a part of the Trust Agreement.
<PAGE>
 
                               TABLE OF CONTENTS



                                  ARTICLE I.

                                 Defined Terms

<TABLE>
     <S>                                                                                                <C>
     Section 1.1.  Definitions.......................................................................    1


                                                  ARTICLE II.

                                       Continuation of the Issuer Trust

     Section 2.1.  Name..............................................................................   10
     Section 2.2.  Office of the Delaware Trustee; Principal Place of Business.......................   10
     Section 2.3.  Initial Contribution of Trust Property; Organizational Expenses...................   10
     Section 2.4.  Issuance of the Preferred Securities..............................................   10
     Section 2.5.  Issuance of the Common Securities; Subscription and Purchase
                     of Debentures...................................................................   11
     Section 2.6.  Continuation of Trust.............................................................   11
     Section 2.7.  Authorization to Enter into Certain Transactions..................................   11
     Section 2.8.  Assets of Trust...................................................................   15
     Section 2.9.  Title to Trust Property...........................................................   15

                                                 ARTICLE III.

                                                Payment Account

     Section 3.1.   Payment Account..................................................................   15



                                                  ARTICLE IV.

                                           Distributions; Redemption

     Section 4.1.   Distributions....................................................................   15
     Section 4.2.   Redemption.......................................................................   16
     Section 4.3.   Subordination of Common Securities...............................................   18
     Section 4.4.   Payment Procedures...............................................................   19
     Section 4.5.   Tax Returns and Reports..........................................................   19
     Section 4.6.   Payment of Taxes, Duties, Etc. of the Issuer Trust...............................   19
     Section 4.7.   Payments under Indenture or Pursuant to Direct Actions...........................   19
</TABLE>

                                       i
 
<PAGE>
 
                                  ARTICLE V.

                         Trust Securities Certificates
<TABLE>
     <S>                                                                                                <C>
     Section 5.1.   Initial Ownership................................................................   20
     Section 5.2.   The Trust Securities Certificates................................................   20
     Section 5.3.   Execution and Delivery of Trust Securities Certificates..........................   20
     Section 5.4.   Book-Entry Preferred Securities..................................................   20
     Section 5.5.   Registration of Transfer and Exchange of Preferred Securities
                       Certificates..................................................................   22
     Section 5.6.   Mutilated, Destroyed, Lost or Stolen Trust Securities Certificates...............   23
     Section 5.7.   Persons Deemed Holders...........................................................   24
     Section 5.8.   Access to List of Holders' Names and Addresses...................................   24
     Section 5.9.   Maintenance of Office or Agency..................................................   24
     Section 5.10.  Appointment of Paying Agent......................................................   24
     Section 5.11.  Ownership of Common Securities by Depositor......................................   25
     Section 5.12.  Notices to Clearing Agency.......................................................   25
     Section 5.13.  Rights of Holders; Waivers of Past Defaults......................................   25


                                                  ARTICLE VI.

                                       Acts of Holders; Meetings; Voting

     Section 6.1.   Limitations on Voting Rights.....................................................   27
     Section 6.2.   Notice of Meetings...............................................................   28
     Section 6.3.   Meetings of Holders of the Preferred Securities..................................   28
     Section 6.4.   Voting Rights. 29
     Section 6.5.   Proxies, etc. 29
     Section 6.6.   Holder Action by Written Consent.................................................   29
     Section 6.7.   Record Date for Voting and Other Purposes........................................   29
     Section 6.8.   Acts of Holders. 30
     Section 6.9.   Inspection of Records............................................................   31


                                                 ARTICLE VII.

                                        Representations and Warranties

     Section 7.1.   Representations and Warranties of the Property Trustee and the
                       Delaware Trustee..............................................................   31
     Section 7.2.   Representations and Warranties of Depositor......................................   32
</TABLE>

                                      ii
 
<PAGE>
 
                                 ARTICLE VIII.

                              The Issuer Trustees

<TABLE>
     <S>                                                                                                <C>
     Section 8.1.   Certain Duties and Responsibilities..............................................   32
     Section 8.2.   Certain Notices..................................................................   35
     Section 8.3.   Certain Rights of Property Trustee...............................................   35
     Section 8.4.   Not Responsible for Recitals or Issuance of Securities...........................   37
     Section 8.5.   May Hold Securities..............................................................   37
     Section 8.6.   Compensation; Indemnity; Fees....................................................   37
     Section 8.7.   Corporate Property Trustee Required; Eligibility of Issuer Trustees..............   38
     Section 8.8.   Conflicting Interests............................................................   39
     Section 8.9.   Co-Trustees and Separate Trustee.................................................   39
     Section 8.10.  Resignation and Removal; Appointment of Successor................................   40
     Section 8.11.  Acceptance of Appointment by Successor...........................................   41
     Section 8.12.  Merger, Conversion, Consolidation or Succession to Business......................   42
     Section 8.13.  Preferential Collection of Claims Against Depositor or Issuer Trust..............   42
     Section 8.14.  Property Trustee May File Proofs of Claim........................................   42
     Section 8.15.  Reports by Property Trustee......................................................   43
     Section 8.16.  Reports to the Property Trustee..................................................   44
     Section 8.17.  Evidence of Compliance with Conditions Precedent.................................   44
     Section 8.18.  Number of Issuer Trustees........................................................   44
     Section 8.19.  Delegation of Power..............................................................   44
     Section 8.20.  Appointment of Administrative Trustees...........................................   45


                                                  ARTICLE IX.

                                      Termination, Liquidation and Merger

     Section 9.1.   Termination Upon Expiration Date.................................................   45
     Section 9.2.   Early Termination................................................................   45
     Section 9.3.   Termination......................................................................   46
     Section 9.4.   Liquidation......................................................................   46
     Section 9.5.   Mergers, Consolidations, Amalgamations or Replacements of
                       Issuer Trust..................................................................   47

                                                  ARTICLE X.

                                           Miscellaneous Provisions

     Section 10.1.  Limitation of Rights of Holders..................................................   48
</TABLE>

                                      iii
 
<PAGE>
 
<TABLE>
     <S>                                                                                                <C>
     Section 10.2.  Amendment........................................................................   48
     Section 10.3.  Separability.....................................................................   49
     Section 10.4.  Governing Law....................................................................   50
     Section 10.5.  Payments Due on Non-Business Day.................................................   50
     Section 10.6.  Successors.......................................................................   50
     Section 10.7.  Headings.........................................................................   50
     Section 10.8.  Reports, Notices and Demands.....................................................   50
     Section 10.9.  Agreement Not to Petition........................................................   51
     Section 10.10. Trust Indenture Act; Conflict with Trust Indenture Act...........................   51
     Section 10.11. Acceptance of Terms of Trust Agreement, Guarantee Agreement and
                      Indenture......................................................................   51

     Exhibit A      Certificate of Trust
     Exhibit B      Form of Certificate Depository Agreement
     Exhibit C      Form of Common Securities Certificate
     Exhibit D      Form of Expense Agreement
     Exhibit E      Form of Preferred Securities Certificate
</TABLE>

                                      iv
 
<PAGE>
 
     AMENDED AND RESTATED TRUST AGREEMENT, dated as of January __, 1997, among
(i) Northern Trust Corporation, a Delaware corporation (including any successors
or assigns, the "Depositor"), (ii) The First National Bank of Chicago, a
national banking association, as property trustee (in such capacity, the
"Property Trustee" and, in its separate corporate capacity and not in its
capacity as Property Trustee, the "Bank"), (iii) First Chicago Delaware Inc., a
Delaware corporation, as Delaware trustee (in such capacity, the "Delaware
Trustee"), (iv) Donald L. Raiff, an individual, and Duane S. Rocheleau, an
individual, each of whose address is c/o Northern Trust Corporation, Fifty South
LaSalle Street, Chicago, Illinois 60675 (each an "Administrative Trustee" and
collectively the "Administrative Trustees") (the Property Trustee, the Delaware
Trustee and the Administrative Trustees being referred to collectively as the
"Issuer Trustees"), and (v) the several Holders, as hereinafter defined.


                                  Witnesseth

     Whereas, the Depositor, the Delaware Trustee and the Administrative Trustee
named therein have heretofore duly declared and established a business trust
pursuant to the Delaware Business Trust Act by entering into the Trust
Agreement, dated as of December 27, 1996 (the "Original Trust Agreement"), and
by the execution and filing by the Delaware Trustee with the Secretary of State
of the State of Delaware of the Certificate of Trust, filed on December 27,
1996, attached as Exhibit A; and

     Whereas, the parties hereto desire to amend and restate the Original Trust
Agreement in its entirety as set forth herein to provide for, among other
things, (i) the issuance of the Common Securities by the Issuer Trust to the
Depositor, (ii) the issuance and sale of the Preferred Securities by the Issuer
Trust pursuant to the Underwriting Agreement, and (iii) the acquisition by the
Issuer Trust from the Depositor of all of the right, title and interest in the
Debentures;

     Now Therefore, in consideration of the agreements and obligations set forth
herein and for other good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged, each party, for the benefit of the
other parties and for the benefit of the Holders, hereby amends and restates the
Original Trust Agreement in its entirety and agrees as follows:


                                    ARTICLE

                                 Defined Terms

     Section 1.1.   Definitions.

     For all purposes of this Trust Agreement, except as otherwise expressly
provided or unless the context otherwise requires:

     (a) The terms defined in this Article have the meanings assigned to them in
this Article, and include the plural as well as the singular;

     (b) All other terms used herein that are defined in the Trust Indenture
Act, either directly or by reference therein, have the meanings assigned to them
therein;
<PAGE>
 
     (c) The words "include", "includes" and "including" shall be deemed to be
followed by the phrase "without limitation";

     (d) All accounting terms used but not defined herein have the meanings
assigned to them in accordance with United States generally accepted accounting
principles;

     (e) Unless the context otherwise requires, any reference to an "Article", a
"Section" or an "Exhibit" refers to an Article, a Section or an Exhibit, as the
case may be, of or to this Trust Agreement; and

     (f) The words "hereby", "herein", "hereof" and "hereunder" and other words
of similar import refer to this Trust Agreement as a whole and not to any
particular Article, Section or other subdivision.

     "Act" has the meaning specified in Section 6.8.

     "Additional Amount" means, with respect to Trust Securities of a given
Liquidation Amount and/or a given period, the amount of Additional Interest (as
defined in the Indenture) paid by the Depositor on a Like Amount of Debentures
for such period.

     "Additional Sums" has the meaning specified in Section 10.6 of the
Indenture.

     "Administrative Trustee" means each of the Persons appointed in accordance
with Section 8.20 solely in such Person's capacity as Administrative Trustee of
the Issuer Trust heretofore created and continued hereunder and not in such
Person's individual capacity, or any successor trustee appointed as herein
provided.

     "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person. For the purposes of this definition,
"control" when used with respect to any specified Person means the power to
direct the management and policies of such Person, directly or indirectly,
whether through the ownership of voting securities, by contract or otherwise;
and the terms "controlling" and "controlled" have meanings correlative to the
foregoing.

     "Applicable Procedures" means, with respect to any transfer or transaction
involving a Book-Entry Preferred Security, the rules and procedures of the
Clearing Agency for such Book-Entry Preferred Security, in each case to the
extent applicable to such transaction and as in effect from time to time.

     "Bank" has the meaning specified in the preamble to this Trust Agreement.

     "Bankruptcy Event" means, with respect to any Person:

     (a) the entry of a decree or order by a court having jurisdiction in the
premises judging such Person a bankrupt or insolvent, or approving as properly
filed a petition seeking reorganization, arrangement, adjudication or
composition of or in respect of such Person under any applicable federal or
state bankruptcy, insolvency, reorganization or other similar law, or appointing
a receiver, liquidator, assignee, trustee, sequestrator (or other similar
official) of such Person or of any substantial part of its 

                                      -2-
<PAGE>
 
property or ordering the winding up or liquidation of its affairs, and the
continuance of any such decree or order unstayed and in effect for a period of
60 consecutive days; or

     (b) the institution by such Person of proceedings to be adjudicated a
bankrupt or insolvent, or the consent by it to the institution of bankruptcy or
insolvency proceedings against it, or the filing by it of a petition or answer
or consent seeking reorganization or relief under any applicable federal or
state bankruptcy, insolvency, reorganization or other similar law, or the
consent by it to the filing of any such petition or to the appointment of a
receiver, liquidator, assignee, trustee, sequestrator (or similar official) of
such Person or of any substantial part of its property, or the making by it of
an assignment for the benefit of creditors, or the admission by it in writing of
its inability to pay its debts generally as they become due and its willingness
to be adjudicated a bankrupt, or the taking of corporate action by such Person
in furtherance of any such action.

     "Bankruptcy Laws" has the meaning specified in Section 10.9.

     "Board of Directors" means the board of directors of the Depositor or the
Executive Committee of the board of directors of the Depositor (or any other
committee of the board of directors of the Depositor performing similar
functions) or a committee designated by the board of directors of the Depositor
(or any such committee), comprised of two or more members of the board of
directors of the Depositor or officers of the Depositor, or both.

     "Board Resolution" means a copy of a resolution certified by the Secretary
or an Assistant Secretary of the Depositor to have been duly adopted by the
Depositor's Board of Directors, or officers of the Depositor to which authority
to act on behalf of the Board of Directors has been delegated, and to be in full
force and effect on the date of such certification, and delivered to the Issuer
Trustees.

     "Book-Entry Preferred Securities Certificate" means a Preferred Securities
Certificate evidencing ownership of Book-Entry Preferred Securities.

     "Book-Entry Preferred Security" means a Preferred Security, the ownership
and transfers of which shall be made through book entries by a Clearing Agency
as described in Section 5.4.

     "Business Day" means a day other than (a) a Saturday or Sunday, (b) a day
on which banking institutions in the City of New York or the City of Chicago,
Illinois are authorized or required by law or executive order to remain closed,
or (c) a day on which the Property Trustee's Corporate Trust Office or the
Corporate Trust Office of the Debenture Trustee is closed for business.

     "Certificate Depository Agreement" means the agreement among the Issuer
Trust, the Depositor and DTC, as the initial Clearing Agency, dated as of the
Closing Date, substantially in the form attached as Exhibit B, as the same may
be amended and supplemented from time to time.

     "Clearing Agency" means an organization registered as a "clearing agency"
pursuant to Section 17A of the Exchange Act. DTC will be the initial Clearing
Agency.

     "Clearing Agency Participant" means a broker, dealer, bank, other financial
institution or other Person for whom from time to time a Clearing Agency effects
book-entry transfers and pledges of securities deposited with the Clearing
Agency.

                                      -3-
<PAGE>
 
     "Closing Date" means the Time of Delivery, which date is also the date of
execution and delivery of this Trust Agreement.

     "Code" means the Internal Revenue Code of 1986, as amended.

     "Commission" means the Securities and Exchange Commission, as from time to
time constituted, created under the Exchange Act or, if at any time after the
execution of this instrument such Commission is not existing and performing the
duties now assigned to it under the Trust Indenture Act, then the body
performing such duties at such time.

     "Common Securities Certificate" means a certificate evidencing ownership of
Common Securities, substantially in the form attached as Exhibit C.

     "Common Security" means an undivided beneficial interest in the assets of
the Issuer Trust, having a Liquidation Amount of $25 and having the rights
provided therefor in this Trust Agreement, including the right to receive
Distributions and a Liquidation Distribution to the extent provided herein.

     "Corporate Trust Office" means (i) when used with respect to the Property
Trustee, the principal office of the Property Trustee located in Chicago,
Illinois, and (ii) when used with respect to the Debenture Trustee, the
principal office of the Debenture Trustee located in Chicago, Illinois.

     "Debenture Event of Default" means any "Event of Default" specified in
Section 5.1 of the Indenture.

     "Debenture Redemption Date" means, with respect to any Debentures to be
redeemed under the Indenture, the date fixed for redemption of such Debentures
under the Indenture.

     "Debenture Tax Event" means a "Tax Event" as defined in the Indenture.

     "Debenture Trustee" means the Person identified as the "Trustee" in the
Indenture, solely in its capacity as Trustee pursuant to the Indenture and not
in its individual capacity, or its successor in interest in such capacity, or
any successor Trustee appointed as provided in the Indenture.

     "Debentures" means the Depositor's [ ]% Junior Subordinated Deferrable
Interest Debentures, Series A, issued pursuant to the Indenture.

     "Definitive Preferred Securities Certificates" means either or both (as the
context requires) of (i) Preferred Securities Certificates issued as Book-Entry
Preferred Securities Certificates as provided in Section 5.2 or 5.4, and (ii)
Preferred Securities Certificates issued in certificated, fully registered form
as provided in Section 5.2, 5.4 or 5.5.

     "Delaware Business Trust Act" means Chapter 38 of Title 12 of the Delaware
Code, 12 Del. Code (S) 3801 et seq., as it may be amended from time to time.
         ---  ----                                                          

     "Delaware Trustee" means the Person identified as the "Delaware Trustee" in
the preamble to this Trust Agreement, solely in its capacity as Delaware Trustee
of the trust heretofore formed and 

                                      -4-
<PAGE>
 
continued hereunder and not in its individual capacity, or its successor in
interest in such capacity, or any successor Delaware trustee appointed as herein
provided.

     "Depositor" has the meaning specified in the preamble to this Trust
Agreement.

     "Direct Action" has the meaning specified in Section 5.13(c).

     "Distribution Date" has the meaning specified in Section 4.1(a).

     "Distributions" means amounts payable in respect of the Trust Securities as
provided in Section 4.1.

     "DTC" means The Depository Trust Company.

     "Early Termination Event" has the meaning specified in Section 9.2.

     "Event of Default" means any one of the following events (whatever the
reason for such event and whether it shall be voluntary or involuntary or be
effected by operation of law or pursuant to any judgment, decree or order of any
court or any order, rule or regulation of any administrative or governmental
body):

     (a) the occurrence of a Debenture Event of Default; or

     (b) default by the Issuer Trust in the payment of any Distribution when it
     becomes due and payable, and continuation of such default for a period of
     30 days; or

     (c) default by the Issuer Trust in the payment of any Redemption Price of
     any Trust Security when it becomes due and payable; or

     (d) default in the performance, or breach, in any material respect, of any
     covenant or warranty of the Issuer Trustees in this Trust Agreement (other
     than those specified in clause (b) or (c) above) and continuation of such
     default or breach for a period of 60 days after there has been given, by
     registered or certified mail, to the Issuer Trustees and to the Depositor
     by the Holders of at least 25% in aggregate Liquidation Amount of the
     Outstanding Preferred Securities a written notice specifying such default
     or breach and requiring it to be remedied and stating that such notice is a
     "Notice of Default" hereunder; or

     (e) the occurrence of a Bankruptcy Event with respect to the Property
     Trustee if a successor Property Trustee has not been appointed within 90
     days thereof.

     "Exchange Act" means the Securities Exchange Act of 1934, and any successor
statute thereto, in each case as amended from time to time.

     "Expense Agreement" means the Agreement as to Expenses and Liabilities,
dated as of the Closing Date, between the Depositor and the Issuer Trust,
substantially in the form attached as Exhibit D, as amended from time to time.

                                      -5-
<PAGE>
 
     "Expiration Date" has the meaning specified in Section 9.1.

     "Guarantee Agreement" means the Guarantee Agreement executed and delivered
by the Depositor and The First National Bank of Chicago, as guarantee trustee,
contemporaneously with the execution and delivery of this Trust Agreement, for
the benefit of the holders of the Preferred Securities, as amended from time to
time.

     "Holder" means a Person in whose name a Trust Security or Trust Securities
are registered in the Securities Register; any such Person shall be a beneficial
owner within the meaning of the Delaware Business Trust Act.

     "Indemnified Person" has the meaning specified in Section 8.6(c).

     "Indenture" means the Junior Subordinated Indenture, dated as of January
__, 1997, between the Depositor and the Debenture Trustee, as trustee, as
amended or supplemented from time to time.

     "Issuer Trust" means the Delaware business trust known as "NTC Capital I"
which was created on December 27, 1996 under the Delaware Business Trust Act
pursuant to the Original Trust Agreement and the filing of the Certificate of
Trust, and continued pursuant to this Trust Agreement.

     "Issuer Trustees" has the meaning specified in the preamble to this Trust
Agreement.

     "Investment Company Act" means the Investment Company Act of 1940, or any
successor statute thereto, in each case as amended from time to time.

     "Lien" means any lien, pledge, charge, encumbrance, mortgage, deed of
trust, adverse ownership interest, hypothecation, assignment, security interest
or preference, priority or other security agreement or preferential arrangement
of any kind or nature whatsoever.

     "Like Amount" means (a) with respect to a redemption of any Trust
Securities, Trust Securities having a Liquidation Amount equal to the principal
amount of Debentures to be contemporaneously redeemed in accordance with the
Indenture, the proceeds of which will be used to pay the Redemption Price of
such Trust Securities, (b) with respect to a distribution of Debentures to
Holders of Trust Securities in connection with a dissolution or liquidation of
the Issuer Trust, Debentures having a principal amount equal to the Liquidation
Amount of the Trust Securities of the Holder to whom such Debentures are
distributed, and (c) with respect to any distribution of Additional Amounts to
Holders of Trust Securities, Debentures having a principal amount equal to the
Liquidation Amount of the Trust Securities in respect of which such distribution
is made.

     "Liquidation Amount" means the stated amount of $25 per Trust Security.

     "Liquidation Date" means the date of the dissolution, winding-up or
termination of the Issuer Trust pursuant to Section 9.4.

     "Liquidation Distribution" has the meaning specified in Section 9.4(d).

                                      -6-
<PAGE>
 
     "Majority in Liquidation Amount of the Preferred Securities" or "Majority
in Liquidation Amount of the Common Securities" means, except as provided by the
Trust Indenture Act, Preferred Securities or Common Securities, as the case may
be, representing more than 50% of the aggregate Liquidation Amount of all then
Outstanding Preferred Securities or Common Securities, as the case may be.

     "Officers' Certificate" means a certificate signed by the Chairman of the
Board, a Vice Chairman of the Board, the President or a Vice President, and by
the Treasurer, an Assistant Treasurer, the Secretary or an Assistant Secretary,
of the Depositor, and delivered to the Issuer Trustees. Any Officers'
Certificate delivered with respect to compliance with a condition or covenant
provided for in this Trust Agreement shall include:

     (a) a statement by each officer signing the Officers' Certificate that such
     officer has read the covenant or condition and the definitions relating
     thereto;

     (b) a brief statement of the nature and scope of the examination or
     investigation undertaken by such officer in rendering the Officers'
     Certificate;

     (c) a statement that such officer has made such examination or
     investigation as, in such officer's opinion, is necessary to enable such
     officer to express an informed opinion as to whether or not such covenant
     or condition has been complied with; and

     (d) a statement as to whether, in the opinion of such officer, such
     condition or covenant has been complied with.

     "Opinion of Counsel" means a written opinion of counsel, who may be counsel
for or an employee of the Depositor or any Affiliate of the Depositor.

     "Original Trust Agreement" has the meaning specified in the recitals to
this Trust Agreement.

     "Outstanding", when used with respect to Trust Securities, means, as of the
date of determination, all Trust Securities theretofore executed and delivered
under this Trust Agreement, except:

     (a) Trust Securities theretofore cancelled by the Property Trustee or
     delivered to the Property Trustee for cancellation;

     (b) Trust Securities for whose payment or redemption money in the necessary
     amount has been theretofore deposited with the Property Trustee or any
     Paying Agent; provided that, if such Trust Securities are to be redeemed,
     notice of such redemption has been duly given pursuant to this Trust
     Agreement; and

     (c) Trust Securities that have been paid or in exchange for or in lieu of
     which other Preferred Securities have been executed and delivered pursuant
     to Sections 5.4, 5.5, 5.6 and 5.11;

provided, however, that in determining whether the Holders of the requisite
Liquidation Amount of the Outstanding Preferred Securities have given any
request, demand, authorization, direction, notice, consent or waiver hereunder,
Preferred Securities owned by the Depositor, any Issuer Trustee or any Affiliate
of the Depositor or of any Issuer Trustee shall be disregarded and deemed not to
be Outstanding, except 

                                      -7-
<PAGE>
 
that (a) in determining whether any Issuer Trustee shall be protected in relying
upon any such request, demand, authorization, direction, notice, consent or
waiver, only Preferred Securities that such Issuer Trustee knows to be so owned
shall be so disregarded, and (b) the foregoing shall not apply at any time when
all of the outstanding Preferred Securities are owned by the Depositor, one or
more of the Issuer Trustees and/or any such Affiliate. Preferred Securities so
owned that have been pledged in good faith may be regarded as Outstanding if the
pledgee establishes to the satisfaction of the Administrative Trustees the
pledgee's right so to act with respect to such Preferred Securities and that the
pledgee is not the Depositor or any Affiliate of the Depositor.

     "Owner" means each Person who is the beneficial owner of Book-Entry
Preferred Securities as reflected in the records of the Clearing Agency or, if a
Clearing Agency Participant is not the Owner, then as reflected in the records
of a Person maintaining an account with such Clearing Agency (directly or
indirectly, in accordance with the rules of such Clearing Agency).

     "Paying Agent" means any paying agent or co-paying agent appointed pursuant
to Section 5.10 and shall initially be the Bank.

     "Payment Account" means a segregated non-interest-bearing corporate trust
account maintained by the Property Trustee in its corporate trust department for
the benefit of the Holders in which all amounts paid in respect of the
Debentures will be held and from which the Property Trustee, through the Paying
Agent, shall make payments to the Holders in accordance with Sections 4.1 and
4.2.

     "Person" means a legal person, including any individual, corporation,
estate, partnership, joint venture, association, joint stock company, company,
limited liability company, trust, unincorporated association, or government or
any agency or political subdivision thereof, or any other entity of whatever
nature.

     "Preferred Securities Certificate" means a certificate evidencing ownership
of Preferred Securities, substantially in the form attached as Exhibit E.

     "Preferred Security" means an undivided beneficial interest in the assets
of the Issuer Trust, having a Liquidation Amount of $25 and having the rights
provided therefor in this Trust Agreement, including the right to receive
Distributions and a Liquidation Distribution to the extent provided herein.

     "Property Trustee" means the Person identified as the "Property Trustee" in
the preamble to this Trust Agreement, solely in its capacity as Property Trustee
of the trust heretofore created and continued hereunder and not in its
individual capacity, or its successor in interest in such capacity, or any
successor property trustee appointed as herein provided.

     "Redemption Date" means, with respect to any Trust Security to be redeemed,
the date fixed for such redemption by or pursuant to this Trust Agreement;
provided that each Debenture Redemption Date and the stated maturity of the
Debentures shall be a Redemption Date for a Like Amount of Trust Securities.

     "Redemption Price" means, with respect to any Trust Security, the
Liquidation Amount of such Trust Security, plus accumulated and unpaid
Distributions to the Redemption Date, plus the related 

                                      -8-
<PAGE>
 
amount of the premium, if any, paid by the Depositor upon the concurrent
redemption of a Like Amount of Debentures.

     "Relevant Trustee" shall have the meaning specified in Section 8.10.

     "Securities Act" means the Securities Act of 1933, and any successor
statute thereto, in each case as amended from time to time.

     "Securities Register" and "Securities Registrar" have the respective
meanings specified in Section 5.5.

     "Successor Preferred Securities" of any particular Preferred Securities
Certificate means every Preferred Securities Certificate issued after, and
evidencing all or a portion of the same beneficial interest in the Issuer Trust
as that evidenced by, such particular Preferred Securities Certificate; and, for
the purposes of this definition, any Preferred Securities Certificate executed
and delivered under Section 5.6 in exchange for or in lieu of a mutilated,
destroyed, lost or stolen Preferred Securities Certificate shall be deemed to
evidence the same beneficial interest in the Issuer Trust as the mutilated,
destroyed, lost or stolen Preferred Securities Certificate.

     "Time of Delivery" has the meaning specified in the Underwriting Agreement.

     "Trust Agreement" means this Amended and Restated Trust Agreement, as the
same may be modified, amended or supplemented in accordance with the applicable
provisions hereof, including for all purposes of this Trust Agreement and any
such modification, amendment or supplement, the provisions of the Trust
Indenture Act that are deemed to be a part of and govern this Trust Agreement
and any such modification, amendment or supplement, respectively.

     "Trust Indenture Act" means the Trust Indenture Act of 1939 as in force at
the date as of which this instrument was executed; provided, however, that in
the event the Trust Indenture Act of 1939 is amended after such date, "Trust
Indenture Act" means, to the extent required by any such amendment, the Trust
Indenture Act of 1939 as so amended.

     "Trust Property" means (a) the Debentures, (b) any cash on deposit in, or
owing to, the Payment Account, and (c) all proceeds and rights in respect of the
foregoing and any other property and assets for the time being held or deemed to
be held by the Property Trustee pursuant to the trusts of this Trust Agreement.

     "Trust Security" means any one of the Common Securities or the Preferred
Securities.

     "Trust Securities Certificate" means any one of the Common Securities
Certificates or the Preferred Securities Certificates.

     "Underwriting Agreement" means the Pricing Agreement, dated as of January
__, 1997, among the Issuer Trust, the Depositor and the Underwriters named
therein, as the same may be amended from time to time.

                                      -9-
<PAGE>
 
     "Vice President," when used with respect to the Depositor, means any duly
appointed vice president, whether or not designated by a number or a word or
words added before or after the title "vice president."


                                  ARTICLE II.

                       Continuation of the Issuer Trust

     Section 2.1.   Name.

     The trust continued hereby shall be known as "NTC Capital I", as such name
may be modified from time to time by the Administrative Trustees following
written notice to the Holders of Trust Securities and the other Issuer Trustees,
in which name the Issuer Trustees may conduct the business of the Issuer Trust,
make and execute contracts and other instruments on behalf of the Issuer Trust
and sue and be sued.

     Section 2.2.   Office of the Delaware Trustee; Principal Place of Business.

     The address of the Delaware Trustee in the State of Delaware is 300 King
Street, Wilmington, Delaware 19801, Attention: Michael J. Majchrzak, or such
other address in the State of Delaware as the Delaware Trustee may designate by
written notice to the Holders, the Depositor, the Property Trustee and the
Administrative Trustees. The principal executive office of the Issuer Trust is
Fifty South LaSalle Street, Chicago, Illinois 60675, Attention: Secretary.

     Section 2.3.   Initial Contribution of Trust Property; Organizational
Expenses.

     The Property Trustee acknowledges receipt in trust from the Depositor in
connection with the Original Trust Agreement of the sum of $10, which
constituted the initial Trust Property. The Depositor shall pay organizational
expenses of the Issuer Trust as they arise or shall, upon request of any Issuer
Trustee, promptly reimburse such Issuer Trustee for any such expenses paid by
such Issuer Trustee. The Depositor shall make no claim upon the Trust Property
for the payment of such expenses.

     Section 2.4.   Issuance of the Preferred Securities.

     The Depositor, both on its own behalf and on behalf of the Issuer Trust
pursuant to the Original Trust Agreement, executed and delivered the
Underwriting Agreement. Contemporaneously with the execution and delivery of
this Trust Agreement, an Administrative Trustee, on behalf of the Issuer Trust,
shall manually execute in accordance with Sections 5.2, 5.3 and 8.9(a) and the
Property Trustee shall deliver to the Underwriters, Preferred Securities
Certificates, registered in the names requested by the Underwriters, evidencing
an aggregate of 6,000,000 Preferred Securities having an aggregate Liquidation
Amount of $150,000,000, against receipt of the aggregate purchase price of such
Preferred Securities of $150,000,000.

                                      -10-
<PAGE>
 
     Section 2.5.   Issuance of the Common Securities; Subscription and Purchase
of Debentures.

     Contemporaneously with the execution and delivery of this Trust Agreement,
an Administrative Trustee, on behalf of the Issuer Trust, shall execute in
accordance with Sections 5.2, 5.3 and 8.9(a) and the Property Trustee shall
deliver to the Depositor Common Securities Certificates, registered in the name
of the Depositor, evidencing an aggregate of 185,568 Common Securities having an
aggregate Liquidation Amount of $4,639,200, against receipt of the aggregate
purchase price of such Common Securities of $4,639,200. Contemporaneously
therewith, an Administrative Trustee, on behalf of the Issuer Trust, shall
subscribe for and purchase from the Depositor the Debentures, registered in the
name of the Property Trustee on behalf of the Issuer Trust and having an
aggregate principal amount equal to $154,639,200, and, in satisfaction of the
purchase price for such Debentures, the Property Trustee, on behalf of the
Issuer Trust, shall deliver to the Depositor the sum of $154,639,200 (being the
sum of the amounts delivered to the Property Trustee pursuant to (i) the second
sentence of Section 2.4, and (ii) the first sentence of this Section 2.5).

     Section 2.6.   Continuation of Trust.

     The exclusive purposes and functions of the Issuer Trust are (a) to issue
and sell Trust Securities and use the proceeds from such sale to acquire the
Debentures, and (b) to engage in those activities necessary or incidental
thereto. The Depositor hereby reaffirms the appointment of the Property Trustee
and the Delaware Trustee and appoints the Administrative Trustees as trustees of
the Issuer Trust, to have all the rights, powers and duties to the extent set
forth herein, and the respective Issuer Trustees hereby accept such appointment.
The Property Trustee hereby declares that it will hold the Trust Property in
trust upon and subject to the conditions set forth herein for the benefit of the
Issuer Trust and the Holders. The Administrative Trustees shall have all rights,
powers and duties set forth herein and in accordance with applicable law with
respect to accomplishing the purposes of the Issuer Trust. The Delaware Trustee
shall not be entitled to exercise any powers, nor shall the Delaware Trustee
have any of the duties and responsibilities, of the Property Trustee or the
Administrative Trustees set forth herein. The Delaware Trustee shall be one of
the trustees of the Issuer Trust for the sole and limited purpose of fulfilling
the requirements of Section 3807 of the Delaware Business Trust Act and for
taking such actions as are required to be taken by a Delaware trustee under the
Delaware Business Trust Act.

     Section 2.7.   Authorization to Enter into Certain Transactions.

     (a) The Issuer Trustees shall conduct the affairs of the Issuer Trust in
accordance with the terms of this Trust Agreement. Subject to the limitations
set forth in paragraph (b) of this Section, and in accordance with the following
provisions (i) and (ii), the Issuer Trustees shall have the authority to enter
into all transactions and agreements determined by the Issuer Trustees to be
appropriate in exercising the authority, express or implied, otherwise granted
to the Issuer Trustees, as the case may be, under this Trust Agreement, and to
perform all acts in furtherance thereof, including, without limitation, the
following:

            (i) As among the Issuer Trustees, each Administrative Trustee shall
have the power and authority to act on behalf of the Issuer Trust with respect
to the following matters:

                    (A) the issuance and sale of the Trust Securities;

                                      -11-
<PAGE>
 
                    (B) to cause the Issuer Trust to enter into, and to execute,
            deliver and perform on behalf of the Issuer Trust, the Expense
            Agreement and the Certificate Depository Agreement and such other
            agreements as may be necessary or desirable in connection with the
            purposes and function of the Issuer Trust;

                    (C) assisting in the registration of the Preferred
            Securities under the Securities Act and under applicable state
            securities or blue sky laws and the qualification of this Trust
            Agreement as a trust indenture under the Trust Indenture Act;

                    (D) assisting in the listing of the Preferred Securities
            upon such securities exchange or exchanges as shall be determined by
            the Depositor, with the registration of the Preferred Securities
            under the Exchange Act and with the preparation and filing of all
            periodic and other reports and other documents pursuant to the
            foregoing;

                    (E) assisting in the sending of notices (other than notices
            of default) and other information regarding the Trust Securities and
            the Debentures to the Holders in accordance with this Trust
            Agreement;

                    (F) the consent to the appointment of a Paying Agent,
            authenticating agent and Securities Registrar in accordance with
            this Trust Agreement (which consent shall not be unreasonably
            withheld);

                    (G) execution of the Trust Securities on behalf of the
            Issuer Trust in accordance with this Trust Agreement;

                    (H) execution and delivery of closing certificates, if any,
            pursuant to the Underwriting Agreement and application for a
            taxpayer identification number for the Issuer Trust;

                    (I) unless otherwise determined by the Property Trustee or
            Holders of at least a Majority in Liquidation Amount of the
            Preferred Securities or as otherwise required by the Delaware
            Business Trust Act or the Trust Indenture Act, to execute on behalf
            of the Issuer Trust (either acting alone or together with any or all
            of the Administrative Trustees) any documents that the
            Administrative Trustees have the power to execute pursuant to this
            Trust Agreement; and

                    (J) the taking of any action incidental to the foregoing as
            the Issuer Trustees may from time to time determine is necessary or
            advisable to give effect to the terms of this Trust Agreement.

            (ii) As among the Issuer Trustees, the Property Trustee shall have
     the power, duty and authority to act on behalf of the Issuer Trust with
     respect to the following matters :

                    (A) the establishment of the Payment Account;

                    (B) the receipt of the Debentures;

                                      -12-
<PAGE>
 
                    (C) the collection of interest, principal and any other
            payments made in respect of the Debentures and the holding of such
            amounts in the Payment Account;

                    (D) the distribution through the Paying Agent of amounts
            distributable to the Holders in respect of the Trust Securities;

                    (E) the exercise of all of the rights, powers and privileges
            of a holder of the Debentures;

                    (F) the sending of notices of default and other information
            regarding the Trust Securities and the Debentures to the Holders in
            accordance with this Trust Agreement;

                    (G) the distribution of the Trust Property in accordance
            with the terms of this Trust Agreement;

                    (II) to the extent provided in this Trust Agreement, the
            winding up of the affairs of and liquidation of the Issuer Trust and
            the preparation, execution and filing of the certificate of
            cancellation with the Secretary of State of the State of Delaware;

                    (I) after an Event of Default (other than under paragraph
            (b), (c), (d) or (e) of the definition of such term if such Event of
            Default is by or with respect to the Property Trustee) the taking of
            any action incidental to the foregoing as the Property Trustee may
            from time to time determine is necessary or advisable to give effect
            to the terms of this Trust Agreement and protect and conserve the
            Trust Property for the benefit of the Holders (without consideration
            of the effect of any such action on any particular Holder); and

                    (J) any of the duties, liabilities, powers or the authority
            of the Administrative Trustees set forth in Section 2.7(a)(i)(E) and
            (I) herein; and in the event of a conflict between the action of the
            Administrative Trustees and the action of the Property Trustee, the
            action of the Property Trustee shall prevail.

     (b) So long as this Trust Agreement remains in effect, the Issuer Trust (or
the Issuer Trustees acting on behalf of the Issuer Trust) shall not undertake
any business, activities or transaction except as expressly provided herein or
contemplated hereby. In particular, the Issuer Trustees shall not (i) acquire
any investments or engage in any activities not authorized by this Trust
Agreement, (ii) sell, assign, transfer, exchange, mortgage, pledge, set-off or
otherwise dispose of any of the Trust Property or interests therein, including
to Holders, except as expressly provided herein, (iii) take any action that
would reasonably be expected to cause the Issuer Trust to become taxable as a
corporation or classified as other than a grantor trust for United States
federal income tax purposes, (iv) incur any indebtedness for borrowed money or
issue any other debt, or (v) take or consent to any action that would result in
the placement of a Lien on any of the Trust Property. The Administrative
Trustees shall defend all claims and demands of all Persons at any time claiming
any Lien on any of the Trust Property adverse to the interest of the Issuer
Trust or the Holders in their capacity as Holders.

     (c) In connection with the issue and sale of the Preferred Securities, the
Depositor shall have the right and responsibility to assist the Issuer Trust
with respect to, or effect on behalf of the Issuer Trust, 

                                      -13-
<PAGE>
 
the following (and any actions taken by the Depositor in furtherance of the
following prior to the date of this Trust Agreement are hereby ratified and
confirmed in all respects):

            (i) the preparation and filing by the Issuer Trust with the
     Commission and the execution on behalf of the Issuer Trust of a
     registration statement on the appropriate form in relation to the Preferred
     Securities, including any amendments thereto and the taking of any action
     necessary or desirable to sell the Preferred Securities in a transaction or
     a series of transactions pursuant thereto;

            (ii) the determination of the States in which to take appropriate
     action to qualify or register for sale all or part of the Preferred
     Securities and the determination of any and all such acts, other than
     actions that must be taken by or on behalf of the Issuer Trust, and the
     advice to the Issuer Trust of actions they must take on behalf of the
     Issuer Trust, and the preparation for execution and filing of any documents
     to be executed and filed by the Issuer Trust or on behalf of the Issuer
     Trust, as the Depositor deems necessary or advisable in order to comply
     with the applicable laws of any such States in connection with the sale of
     the Preferred Securities;

            (iii) the preparation for filing by the Issuer Trust and execution
     on behalf of the Issuer Trust of an application to the Nasdaq Stock Market
     or any national stock exchange or other interdealer quotation system for
     listing upon notice of issuance of any Preferred Securities;

            (iv) the preparation for filing by the Issuer Trust with the
     Commission and the execution on behalf of the Issuer Trust of a
     registration statement on Form 8-A relating to the registration of the
     Preferred Securities under Section 12(b) or 12(g) of the Exchange Act,
     including any amendments thereto;

            (v) the negotiation of the terms of, and the execution and delivery
     of, the Underwriting Agreement providing for the sale of the Preferred
     Securities; and

            (vi) the taking of any other actions necessary or desirable to carry
     out any of the foregoing activities.

     (d) Notwithstanding anything herein to the contrary, the Issuer Trustees
are authorized and directed to conduct the affairs of the Issuer Trust and to
operate the Issuer Trust so that the Issuer Trust will not be deemed to be an
"investment company" required to be registered under the Investment Company Act,
and will not be taxable as a corporation or classified as other than a grantor
trust for United States federal income tax purposes and so that the Debentures
will be treated as indebtedness of the Depositor for United States federal
income tax purposes. In this connection, each Administrative Trustee, the
Property Trustee and the Holders of at least a Majority in Liquidation Amount of
the Common Securities are authorized to take any action, not inconsistent with
applicable law, the Certificate of Trust or this Trust Agreement, that such
Administrative Trustee, the Property Trustee or Holders of Common Securities
determine in their discretion to be necessary or desirable for such purposes, as
long as such action does not adversely affect in any material respect the
interests of the Holders of the Outstanding Preferred Securities. In no event
shall the Issuer Trustees be liable to the Issuer Trust or the Holders for any
failure to comply with this section that results from a change in law or
regulation or in the interpretation thereof.

                                      -14-
<PAGE>
 
     Section 2.8.   Assets of Trust.

     The assets of the Issuer Trust shall consist of the Trust Property.

     Section 2.9.   Title to Trust Property.

     Legal title to all Trust Property shall be vested at all times in the
Property Trustee (in its capacity as such) and shall be held and administered by
the Property Trustee in trust for the benefit of the Issuer Trust and the
Holders in accordance with this Trust Agreement.


                                 ARTICLE III.

                                PAYMENT ACCOUNT

     Section 3.1.   Payment Account.

     (a)  On or prior to the Closing Date, the Property Trustee shall establish
the Payment Account. The Property Trustee and its agents shall have exclusive
control and sole right of withdrawal with respect to the Payment Account for the
purpose of making deposits in and withdrawals from the Payment Account in
accordance with this Trust Agreement. All monies and other property deposited or
held from time to time in the Payment Account shall be held by the Property
Trustee in the Payment Account for the exclusive benefit of the Holders and for
distribution as herein provided, including (and subject to) any priority of
payments provided for herein.

     (b)  The Property Trustee shall deposit in the Payment Account, promptly
upon receipt, all payments of principal of or interest on, and any other
payments or proceeds with respect to, the Debentures. Amounts held in the
Payment Account shall not be invested by the Property Trustee pending
distribution thereof.

                                  ARTICLE IV.

                           DISTRIBUTIONS; REDEMPTION

     Section 4.1.   Distributions.

     (a)  The Trust Securities represent undivided beneficial interests in the
Trust Property, and Distributions (including of Additional Amounts) will be made
on the Trust Securities at the rate and on the dates that payments of interest
(including of Additional Interest, as defined in the Indenture) are made on the
Debentures. Accordingly:

          (i)    Distributions on the Trust Securities shall be cumulative, and
     will accumulate whether or not there are funds of the Issuer Trust
     available for the payment of Distributions. Distributions shall accumulate
     from January __, 1997, and, except in the event (and to the extent) that
     the Depositor exercises its right to defer the payment of interest on the
     Debentures pursuant to the Indenture, shall be payable quarterly in arrears
     on March 31, June 30, September 30 and 

                                      -15-
<PAGE>
 
     December 31 of each year, commencing on March 31, 1997. If any date on
     which a Distribution is otherwise payable on the Trust Securities is not a
     Business Day, then the payment of such Distribution shall be made on the
     next succeeding day that is a Business Day (and without any interest or
     other payment in respect of any such delay), with the same force and effect
     as if made on the date on which such payment was originally payable (each
     date on which Distributions are payable in accordance with this Section
     4.1(a), a "Distribution Date").

          (ii)   The Trust Securities shall be entitled to Distributions payable
     at a rate of [  ]% per annum of the Liquidation Amount of the Trust
     Securities. The amount of Distributions payable for any period less than a
     full Distribution period shall be computed on the basis of a 360-day year
     of twelve 30-day months and the actual number of days elapsed in a partial
     month in a period. Distributions payable for each full Distribution period
     will be computed by dividing the rate per annum by four. The amount of
     Distributions payable for any period shall include any Additional Amounts
     in respect of such period.

          (iii)  Distributions on the Trust Securities shall be made by the
     Property Trustee from the Payment Account and shall be payable on each
     Distribution Date only to the extent that the Issuer Trust has funds then
     on hand and available in the Payment Account for the payment of such
     Distributions.

     (b)  Distributions on the Trust Securities with respect to a Distribution
Date shall be payable to the Holders thereof as they appear on the Securities
Register for the Trust Securities at the close of business on the relevant
record date, which shall be at the close of business on the fifteenth day
(whether or not a Business Day) next preceding the relevant Distribution Date.

     Section 4.2.   Redemption.

     (a)  On each Debenture Redemption Date and on the stated maturity of the
Debentures, the Issuer Trust will be required to redeem a Like Amount of Trust
Securities at the Redemption Price.

     (b)  Notice of redemption shall be given by the Property Trustee by first-
class mail, postage prepaid, mailed not less than 30 nor more than 60 days prior
to the Redemption Date to each Holder of Trust Securities to be redeemed, at
such Holder's address appearing in the Security Register. All notices of
redemption shall state:

          (i)    the Redemption Date;

          (ii)   the Redemption Price or if the Redemption Price cannot be
     calculated prior to the time the notice is required to be sent, the
     estimate of the Redemption Price together with a statement that it is an
     estimate and that the actual Redemption Price will be calculated on the
     third Business Day prior to the Redemption Date (and if an estimate is
     provided, a further notice shall be sent of the actual Redemption Price on
     the date that such Redemption Price is calculated);

          (iii)  the CUSIP number or CUSIP numbers of the Preferred Securities
     affected;

          (iv)   if less than all the Outstanding Trust Securities are to be
     redeemed, the identification and the aggregate Liquidation Amount of the
     particular Trust Securities to be redeemed;

                                      -16-
<PAGE>
 
          (v)    that on the Redemption Date the Redemption Price will become
     due and payable upon each such Trust Security to be redeemed and that
     Distributions thereon will cease to accumulate on and after said date,
     except as provided in Section 4.2(d) below; and

          (vi)   the place or places where the Trust Securities are to be
     surrendered for the payment of the Redemption Price.

     (c)  The Trust Securities redeemed on each Redemption Date shall be
redeemed at the Redemption Price with the proceeds from the contemporaneous
redemption of Debentures. Redemptions of the Trust Securities shall be made and
the Redemption Price shall be payable on each Redemption Date only to the extent
that the Issuer Trust has funds then on hand and available in the Payment
Account for the payment of such Redemption Price.

     (d)  If the Property Trustee gives a notice of redemption in respect of any
Preferred Securities, then, by 12:00 noon, New York City time, on the Redemption
Date, subject to Section 4.2(c), the Property Trustee will, with respect to 
Book-Entry Preferred Securities, irrevocably deposit with the Clearing Agency
for such Book-Entry Preferred Securities, to the extent available therefor,
funds sufficient to pay the applicable Redemption Price and will give such
Clearing Agency irrevocable instructions and authority to pay the Redemption
Price to the Holders of the Preferred Securities. With respect to Preferred
Securities that are not Book-Entry Preferred Securities, the Property Trustee,
subject to Section 4.2(c), will irrevocably deposit with the Paying Agent, to
the extent available therefor, funds sufficient to pay the applicable Redemption
Price and will give the Paying Agent irrevocable instructions and authority to
pay the Redemption Price to the Holders of the Preferred Securities upon
surrender of their Preferred Securities Certificates. Notwithstanding the
foregoing, Distributions payable on or prior to the Redemption Date for any
Trust Securities called for redemption shall be payable to the Holders of such
Trust Securities as they appear on the Securities Register for the Trust
Securities on the relevant record dates for the related Distribution Dates. If
notice of redemption shall have been given and funds deposited as required, then
upon the date of such deposit, all rights of Holders holding Trust Securities so
called for redemption will cease, except the right of such Holders to receive
the Redemption Price and any Distribution payable in respect of the Trust
Securities on or prior to the Redemption Date, but without interest, and such
Securities will cease to be outstanding. In the event that any date on which any
Redemption Price is payable is not a Business Day, then payment of the
Redemption Price payable on such date will be made on the next succeeding day
that is a Business Day (without any interest or other payment in respect of any
such delay), except that, if such Business Day falls in the next calendar year,
such payment will be made on the immediately preceding Business Day, in each
case, with the same force and effect as if made on such date. In the event that
payment of the Redemption Price in respect of any Trust Securities called for
redemption is improperly withheld or refused and not paid either by the Issuer
Trust or by the Depositor pursuant to the Guarantee Agreement, Distributions on
such Trust Securities will continue to accumulate, as set forth in Section 4.1,
from the Redemption Date originally established by the Issuer Trust for such
Trust Securities to the date such Redemption Price is actually paid, in which
case the actual payment date will be the date fixed for redemption for purposes
of calculating the Redemption Price.

     (e)  Subject to Section 4.3(a), if less than all the Outstanding Trust
Securities are to be redeemed on a Redemption Date, then the aggregate
Liquidation Amount of Trust Securities to be redeemed shall be allocated pro
rata to the Common Securities and the Preferred Securities based upon the
relative Liquidation Amounts of such classes. The particular Preferred
Securities to be redeemed shall be selected 

                                      -17-
<PAGE>
 
on a pro rata basis based upon their respective Liquidation Amounts not more
than 60 days prior to the Redemption Date by the Property Trustee from the
Outstanding Preferred Securities not previously called for redemption, provided
that so long as the Preferred Securities are in book-entry-only form, such
selection shall be made in accordance with the customary procedures for the
Clearing Agency for the Preferred Securities. The Property Trustee shall
promptly notify the Securities Registrar in writing of the Preferred Securities
selected for redemption and, in the case of any Preferred Securities selected
for partial redemption, the Liquidation Amount thereof to be redeemed. For all
purposes of this Trust Agreement, unless the context otherwise requires, all
provisions relating to the redemption of Preferred Securities shall relate, in
the case of any Preferred Securities redeemed or to be redeemed only in part, to
the portion of the aggregate Liquidation Amount of Preferred Securities that has
been or is to be redeemed.

     Section 4.3.   Subordination of Common Securities.

     (a)  Payment of Distributions (including any Additional Amounts) on, the
Redemption Price of, and the Liquidation Distribution in respect of the Trust
Securities, as applicable, shall be made, subject to Section 4.2(e), pro rata
among the Common Securities and the Preferred Securities based on the
Liquidation Amount of the Trust Securities; provided, however, that if on any
Distribution Date, Redemption Date or Liquidation Date any Event of Default
resulting from a Debenture Event of Default specified in Section 5.1(1) or
5.1(2) of the Indenture shall have occurred and be continuing, no payment of any
Distribution (including any Additional Amounts) on, Redemption Price of, or
Liquidation Distribution in respect of any Common Security, and no other payment
on account of the redemption, liquidation or other acquisition of Common
Securities, shall be made unless payment in full in cash of all accumulated and
unpaid Distributions (including any Additional Amounts) on all Outstanding
Preferred Securities for all Distribution periods terminating on or prior
thereto, or in the case of payment of the Redemption Price the full amount of
such Redemption Price on all Outstanding Preferred Securities then called for
redemption, or in the case of payment of the Liquidation Distribution the full
amount of such Liquidation Distribution on all Outstanding Preferred Securities,
shall have been made or provided for, and all funds immediately available to the
Property Trustee shall first be applied to the payment in full in cash of all
Distributions (including any Additional Amounts) on, or the Redemption Price of,
the Preferred Securities then due and payable.

     (b)  In the case of the occurrence of any Event of Default resulting from
any Debenture Event of Default, the Holders of the Common Securities shall have
no right to act with respect to any such Event of Default under this Trust
Agreement until the effect of all such Events of Default with respect to the
Preferred Securities have been cured, waived or otherwise eliminated. Until all
such Events of Default under this Trust Agreement with respect to the Preferred
Securities have been so cured, waived or otherwise eliminated, the Property
Trustee shall act solely on behalf of the Holders of the Preferred Securities
and not on behalf of the Holders of the Common Securities, and only the Holders
of the Preferred Securities will have the right to direct the Property Trustee
to act on their behalf.

     Section 4.4.   Payment Procedures.

     Payments of Distributions (including any Additional Amounts) in respect of
the Preferred Securities shall be made by check mailed to the address of the
Person entitled thereto as such address shall appear on the Securities Register
or, if the Preferred Securities are held by a Clearing Agency, such
Distributions shall be made to the Clearing Agency in immediately available
funds. Payments in respect 

                                      -18-
<PAGE>
 
of the Common Securities shall be made in such manner as shall be mutually
agreed between the Property Trustee and the Holders of the Common Securities.

     Section 4.5.   Tax Returns and Reports.

     The Administrative Trustees shall prepare (or cause to be prepared), at the
Depositor's expense, and file all United States federal, state and local tax and
information returns and reports required to be filed by or in respect of the
Issuer Trust. In this regard, the Administrative Trustees shall (a) prepare and
file (or cause to be prepared and filed) all Internal Revenue Service forms
required to be filed in respect of the Issuer Trust in each taxable year of the
Issuer Trust, and (b) prepare and furnish (or cause to be prepared and
furnished) to each Holder all Internal Revenue Service forms required to be
provided by the Issuer Trust. The Administrative Trustees shall provide the
Depositor and the Property Trustee with a copy of all such returns and reports
promptly after such filing or furnishing. The Issuer Trustees shall comply with
United States federal withholding and backup withholding tax laws and
information reporting requirements with respect to any payments to Holders under
the Trust Securities.

     Section 4.6.   Payment of Taxes, Duties, Etc. of the Issuer Trust.

     Upon receipt under the Debentures of Additional Sums, the Property Trustee
shall promptly pay any taxes, duties or governmental charges of whatsoever
nature (other than withholding taxes) imposed on the Issuer Trust by the United
States or any other taxing authority.

     Section 4.7.   Payments under Indenture or Pursuant to Direct Actions.

     Any amount payable hereunder to any Holder of Preferred Securities shall be
reduced by the amount of any corresponding payment such Holder (or Owner with
respect to an Holder's Preferred Securities) has directly received pursuant to
Section 5.8 of the Indenture or Section 5.13 of this Trust Agreement.


                                  ARTICLE V.

                         Trust Securities Certificates

     Section 5.1.   Initial Ownership.

     Upon the creation of the Issuer Trust and the contribution by the Depositor
pursuant to Section 2.3 and until the issuance of the Trust Securities, and at
any time during which no Trust Securities are outstanding, the Depositor shall
be the sole beneficial owner of the Issuer Trust.

     Section 5.2.   The Trust Securities Certificates.

     (a)  The Preferred Securities Certificates shall be issued in minimum
denominations of $25 Liquidation Amount and integral multiples of $25 in excess
thereof, and the Common Securities Certificates shall be issued in denominations
of $25 Liquidation Amount and integral multiples thereof. The Trust Securities
Certificates shall be executed on behalf of the Issuer Trust by manual signature
of at least one Administrative Trustee. Trust Securities Certificates bearing
the manual signatures of 

                                      -19-
<PAGE>
 
individuals who were, at the time when such signatures shall have been affixed,
authorized to sign on behalf of the Issuer Trust, shall be validly issued and
entitled to the benefits of this Trust Agreement, notwithstanding that such
individuals or any of them shall have ceased to be so authorized prior to the
delivery of such Trust Securities Certificates or did not hold such offices at
the date of delivery of such Trust Securities Certificates. A transferee of a
Trust Securities Certificate shall become a Holder, and shall be entitled to the
rights and subject to the obligations of a Holder hereunder, upon due
registration of such Trust Securities Certificate in such transferee's name
pursuant to Section 5.5.

     (b)  Upon their original issuance, Preferred Securities Certificates shall
be issued in the form of one or more Book-Entry Preferred Securities
Certificates registered in the name of DTC, as Clearing Agency, or its nominee
and deposited with DTC or a custodian for DTC for credit by DTC to the
respective accounts of the Owners thereof (or such other accounts as they may
direct).

     (c)  A single Common Securities Certificate representing the Common
Securities shall be issued to the Depositor in the form of a definitive Common
Securities Certificate.

     Section 5.3.   Execution and Delivery of Trust Securities Certificates.

     At each Time of Delivery, the Administrative Trustees shall cause Trust
Securities Certificates, in an aggregate Liquidation Amount as provided in
Sections 2.4 and 2.5, to be executed on behalf of the Issuer Trust and delivered
to or upon the written order of the Depositor, executed by one authorized
officer thereof, without further corporate action by the Depositor, in
authorized denominations.

     Section 5.4.   Book-Entry Preferred Securities.

     (a)  Each Book-Entry Preferred Securities Certificate issued under this
Trust Agreement shall be registered in the name of the Clearing Agency or a
nominee thereof and delivered to such Clearing Agency or a nominee thereof or
custodian therefor, and each such Book-Entry Preferred Securities Certificate
shall constitute a single Preferred Securities Certificate for all purposes of
this Trust Agreement.

     (b)  Notwithstanding any other provision in this Trust Agreement, no Book-
Entry Preferred Securities Certificate may be exchanged in whole or in part for
Preferred Securities Certificates registered, and no transfer of a Book-Entry
Preferred Securities Certificate in whole or in part may be registered, in the
name of any Person other than the Clearing Agency for such Book-Entry Preferred
Securities Certificates or a nominee thereof unless (i) the Clearing Agency
advises the Property Trustee in writing that the Clearing Agency is no longer
willing or able to properly discharge its responsibilities with respect to the
Book-Entry Preferred Securities Certificates, and the Property Trustee is unable
to locate a qualified successor, (ii) the Issuer Trust at its option advises the
Depositary in writing that it elects to terminate the book-entry system through
the Clearing Agency, or (iii) a Debenture Event of Default has occurred and is
continuing. Upon the occurrence of any event specified in clause (i), (ii) or
(iii) above, the Administrative Trustees shall notify the Clearing Agency and
instruct the Clearing Agency to notify all Owners of Book-Entry Preferred
Securities, the Delaware Trustee and the Administrative Trustees of the
occurrence of such event and of the availability of the Definitive Preferred
Securities Certificates to Owners of such class or classes, as applicable,
requesting the same.

                                      -20-
<PAGE>
 
     (c)  If any Book-Entry Preferred Securities Certificate is to be exchanged
for other Preferred Securities Certificates or cancelled in part, or if any
other Preferred Securities Certificate is to be exchanged in whole or in part
for Book-Entry Preferred Securities represented by a Book-Entry Preferred
Securities Certificate, then either (i) such Book-Entry Preferred Securities
Certificate shall be so surrendered for exchange or cancellation as provided in
this Article V or (ii) the aggregate Liquidation Amount represented by such
Book-Entry Preferred Securities Certificate shall be reduced, subject to Section
5.2, or increased by an amount equal to the Liquidation Amount represented by
that portion of the Book-Entry Preferred Securities Certificate to be so
exchanged or cancelled, or equal to the Liquidation Amount represented by such
other Preferred Securities Certificates to be so exchanged for Book-Entry
Preferred Securities represented thereby, as the case may be, by means of an
appro  priate adjustment made on the records of the Securities Registrar,
whereupon the Property Trustee, in accordance with the Applicable Procedures,
shall instruct the Clearing Agency or its authorized representative to make a
corresponding adjustment to its records. Upon surrender to the Administrative
Trustees or the Securities Registrar of the Book-Entry Preferred Securities
Certificate or Certificates by the Clearing Agency, accompanied by registration
instructions, the Administrative Trustees, or any one of them, shall execute the
Definitive Preferred Securities Certificates in accordance with the instructions
of the Clearing Agency. None of the Securities Registrar or the Issuer Trustees
shall be liable for any delay in delivery of such instructions and may
conclusively rely on, and shall be protected in relying on, such instructions.
Upon the issuance of Definitive Preferred Securities Certificates, the Issuer
Trustees shall recognize the Holders of the Definitive Preferred Securities
Certificates as Holders. The Definitive Preferred Securities Certificates shall
be printed, lithographed or engraved or may be produced in any other manner as
is reasonably acceptable to the Administrative Trustees, as evidenced by the
execution thereof by the Administrative Trustees or any one of them.

     (d)  Every Preferred Securities Certificate executed and delivered upon
registration of transfer of, or in exchange for or in lieu of, a Book-Entry
Preferred Securities Certificate or any portion thereof, whether pursuant to
this Article V or Article IV or otherwise, shall be executed and delivered in
the form of, and shall be, a Book-Entry Preferred Securities Certificate, unless
such Preferred Securities Certificate is registered in the name of a Person
other than the Clearing Agency for such Book-Entry Preferred Securities
Certificate or a nominee thereof.

     (e)  The Clearing Agency or its nominee, as registered owner of a Book-
Entry Preferred Securities Certificate, shall be the Holder of such Book-Entry
Preferred Securities Certificate for all purposes under this Trust Agreement and
the Book-Entry Preferred Securities Certificate, and Owners with respect to a
Book-Entry Preferred Securities Certificate shall hold such interests pursuant
to the Applicable Procedures. The Securities Registrar and the Issuer Trustees
shall be entitled to deal with the Clearing Agency for all purposes of this
Trust Agreement relating to the Book-Entry Preferred Securities Certificates
(including the payment of the Liquidation Amount of and Distributions on the
Book-Entry Preferred Securities represented thereby and the giving of
instructions or directions by Owners of Book-Entry Preferred Securities
represented thereby) as the sole Holder of the Book-Entry Preferred Securities
represented thereby and shall have no obligations to the Owners thereof. None of
the Property Trustee, the Administrative Trustees nor the Securities Registrar
shall have any liability in respect of any transfers effected by the Clearing
Agency.

     The rights of the Owners of the Book-Entry Preferred Securities shall be
exercised only through the Clearing Agency and shall be limited to those
established by law, the Applicable Procedures and agreements between such Owners
and the Clearing Agency and/or the Clearing Agency Participants. 

                                      -21-
<PAGE>
 
Pursuant to the Certificate Depository Agreement, unless and until Definitive
Preferred Securities Certificates are issued pursuant to Section 5.4(b), the
Clearing Agency will make book-entry transfers among the Clearing Agency
Participants and receive and transmit payments on the Preferred Securities to
such Clearing Agency Participants, and none of the Depositor, the Administrative
Trustees or the Issuer Trustees shall have any responsibility or obligation with
respect thereto.

     Section 5.5.   Registration of Transfer and Exchange of Preferred
Securities Certificates.

     (a)  The Property Trustee shall keep or cause to be kept, at the office or
agency maintained pursuant to Section 5.9, a register or registers for the
purpose of registering Trust Securities Certificates and transfers and exchanges
of Trust Securities Certificates (the "Securities Register") in which the
registrar and transfer agent with respect to the Trust Securities (the
"Securities Registrar"), subject to such reasonable regulations as it may
prescribe, shall provide for the registration of Preferred Securities
Certificates and Common Securities Certificates (subject to Section 5.11 in the
case of the Common Securities Certificates) and registration of transfers and
exchanges of Preferred Securities Certificates as herein provided. The Person
acting as the Property Trustee shall at all times also be the Securities
Registrar.

     Upon surrender for registration of transfer of any Preferred Securities
Certificate at the office or agency maintained pursuant to Section 5.9, the
Administrative Trustees or any one of them shall execute and deliver to the
Property Trustee, and the Property Trustee shall deliver, in the name of the
designated transferee or transferees, one or more new Preferred Securities
Certificates in authorized denominations of a like aggregate Liquidation Amount
dated the date of execution by such Administrative Trustee or Trustees.

     The Securities Registrar shall not be required, (i) to issue, register the
transfer of or exchange any Preferred Security during a period beginning at the
opening of business fifteen days before the day of selection for redemption of
such Preferred Securities pursuant to Article IV and ending at the close of
business on the day of mailing of the notice of redemption, or (ii) to register
the transfer of or exchange any Preferred Security so selected for redemption in
whole or in part, except, in the case of any such Preferred Security to be
redeemed in part, any portion thereof not to be redeemed.

     Every Preferred Securities Certificate presented or surrendered for
registration of transfer or exchange shall be accompanied by a written
instrument of transfer in form satisfactory to an Administrative Trustee and the
Securities Registrar duly executed by the Holder or its attorney duly authorized
in writing. Each Preferred Securities Certificate surrendered for registration
of transfer or exchange shall be cancelled and subsequently disposed of by the
Property Trustee in accordance with such Person's customary practice.

     No service charge shall be made for any registration of transfer or
exchange of Preferred Securities Certificates, but the Securities Registrar may
require payment of a sum sufficient to cover any tax or governmental charge that
may be imposed in connection with any transfer or exchange of Preferred
Securities Certificates.

     (b)  Notwithstanding any other provision of this Trust Agreement, transfers
and exchanges of Preferred Securities Certificates and beneficial interests in a
Book-Entry Preferred Securities Certificate of the kinds specified in this
Section 5.5(b) shall be made only in accordance with this Section 5.5(b).

                                      -22-
<PAGE>
 
          (i)  Non-Book-Entry Preferred Securities Certificate to Book-Entry 
               -------------------------------------------------------------
     Preferred Securities Certificate.  If the Holder of a Preferred Securities 
     --------------------------------
     Certificate (other than a Book-Entry Preferred Securities Certificate)
     wishes at any time to transfer all or any portion of such Preferred
     Securities Certificate to a Person who wishes to take delivery thereof in
     the form of a beneficial interest in a Book-Entry Preferred Securities
     Certificate, such transfer may be effected only in accordance with the
     provisions of this Clause (b)(i) and subject to the Applicable Procedures.
     Upon receipt by the Securities Registrar of (A) such Preferred Securities
     Certificate as provided in Section 5.5(a) and instructions satisfactory to
     the Securities Registrar directing that a beneficial interest in the Book-
     Entry Preferred Securities Certificate of a specified number of Preferred
     Securities not greater than the number of Preferred Securities represented
     by such Preferred Securities Certificate be credited to a specified
     Clearing Agency Participant's account, then the Securities Registrar shall
     cancel such Preferred Securities Certificate (and issue a new Preferred
     Securities Certificate in respect of any untransferred portion thereof) as
     provided in Section 5.5(a) and increase the aggregate Liquidation Amount of
     the Book-Entry Preferred Securities Certificate by the Liquidation Amount
     represented by such Preferred Securities so transferred as provided in
     Section 5.4(c).

          (ii) Non-Book-Entry Preferred Securities Certificate to Non-Book-Entry
               -----------------------------------------------------------------
     Preferred Securities Certificate.  A Preferred Securities Certificate that 
     --------------------------------         
     is not a Book-Entry Preferred Securities Certificate may be transferred, in
     whole or in part, to a Person who takes delivery in the form of another
     Preferred Securities Certificate that is not a Book-Entry Preferred
     Securities Certificate as provided in Section 5.5(a).

          (iii) Exchanges between Book-Entry Preferred Securities Certificate 
                -------------------------------------------------------------
     and Non-Book-Entry Preferred Securities Certificate.  A beneficial 
     ---------------------------------------------------             
     interest in a Book-Entry Preferred Securities Certificate may be exchanged
     for a Preferred Securities Certificate that is not a Book-Entry Preferred
     Securities Certificate as provided in Section 5.4.

     Section 5.6.   Mutilated, Destroyed, Lost or Stolen Trust Securities
Certificates.

     If (a) any mutilated Trust Securities Certificate shall be surrendered to
the Securities Registrar, or if the Securities Registrar shall receive evidence
to its satisfaction of the destruction, loss or theft of any Trust Securities
Certificate, and (b) there shall be delivered to the Securities Registrar and
the Administrative Trustees such security or indemnity as may be required by
them to save each of them harmless, then in the absence of notice that such
Trust Securities Certificate shall have been acquired by a bona fide purchaser,
the Administrative Trustees, or any one of them, on behalf of the Issuer Trust
shall execute and make available for delivery, in exchange for or in lieu of any
such mutilated, destroyed, lost or stolen Trust Securities Certificate, a new
Trust Securities Certificate of like class, tenor and denomination. In
connection with the issuance of any new Trust Securities Certificate under this
Section 5.6, the Administrative Trustees or the Securities Registrar may require
the payment of a sum sufficient to cover any tax or other governmental charge
that may be imposed in connection therewith. Any duplicate Trust Securities
Certificate issued pursuant to this Section shall constitute conclusive evidence
of an undivided beneficial interest in the assets of the Issuer Trust
corresponding to that evidenced by the lost, stolen or destroyed Trust
Securities Certificate, as if originally issued, whether or not the lost, stolen
or destroyed Trust Securities Certificate shall be found at any time.

                                      -23-
<PAGE>
 
     Section 5.7.   Persons Deemed Holders.

     The Issuer Trustees and the Securities Registrar shall each treat the
Person in whose name any Trust Securities Certificate shall be registered in the
Securities Register as the owner of such Trust Securities Certificate for the
purpose of receiving Distributions and for all other purposes whatsoever, and
none of the Issuer Trustees and the Securities Registrar shall be bound by any
notice to the contrary.

     Section 5.8.   Access to List of Holders' Names and Addresses.

     Each Holder and each Owner shall be deemed to have agreed not to hold the
Depositor, the Property Trustee, the Delaware Trustee or the Administrative
Trustees accountable by reason of the disclosure of its name and address,
regardless of the source from which such information was derived.

     Section 5.9.   Maintenance of Office or Agency.

     The Property Trustee shall designate, with the consent of the
Administrative Trustees, which consent shall not be unreasonably withheld, an
office or offices or agency or agencies where Preferred Securities Certificates
may be surrendered for registration of transfer or exchange and where notices
and demands to or upon the Issuer Trustees in respect of the Trust Securities
Certificates may be served. The Administrative Trustees initially designate The
First National Bank of Chicago, One First National Plaza, Suite 0126, Chicago,
Illinois 60670, Attention: Corporate Trust Administration, as its office and
agency for such purposes. The Property Trustee shall give prompt written notice
to the Depositor, the Administrative Trustees and to the Holders of any change
in the location of the Securities Register or any such office or agency.

     Section 5.10.  Appointment of Paying Agent.

     The Paying Agent shall make Distributions to Holders from the Payment
Account and shall report the amounts of such Distributions to the Property
Trustee and the Administrative Trustees. Any Paying Agent shall have the
revocable power to withdraw funds from the Payment Account solely for the
purpose of making the Distributions referred to above. The Administrative
Trustees may revoke such power and remove the Paying Agent in their sole
discretion. The Paying Agent shall initially be the Bank. Any Person acting as
Paying Agent shall be permitted to resign as Paying Agent upon 30 days' written
notice to the Administrative Trustees and the Property Trustee. If the Bank
shall no longer be the Paying Agent or a successor Paying Agent shall resign or
its authority to act be revoked, the Administrative Trustees shall appoint a
successor (which shall be a bank or trust company) to act as Paying Agent. Such
successor Paying Agent or any additional Paying Agent appointed by the
Administrative Trustees shall execute and deliver to the Issuer Trustees an
instrument in which such successor Paying Agent or additional Paying Agent shall
agree with the Issuer Trustees that as Paying Agent, such successor Paying Agent
or additional Paying Agent will hold all sums, if any, held by it for payment to
the Holders in trust for the benefit of the Holders entitled thereto until such
sums shall be paid to such Holders. The Paying Agent shall return all unclaimed
funds to the Property Trustee and upon removal of a Paying Agent such Paying
Agent shall also return all funds in its possession to the Property Trustee. The
provisions of Sections 8.1, 8.3 and 8.6 herein shall apply to the Bank also in
its role as Paying Agent, for so long as the Bank shall act as Paying Agent and,
to the extent applicable, to any other paying agent appointed hereunder. Any
reference in this Trust Agreement to the Paying Agent shall include any co-
paying agent unless the context requires otherwise.

                                      -24-
<PAGE>
 
     Section 5.11.  Ownership of Common Securities by Depositor.

     At each Time of Delivery, the Depositor shall acquire, and thereafter shall
retain, beneficial and record ownership of the Common Securities. The Depositor
may not transfer the Common Securities except (i) in connection with a
consolidation or merger of the Depositor into another Person, or any conveyance,
transfer or lease by the Depositor of its properties and assets substantially as
an entirety to any Person, pursuant to Section 8.1 of the Indenture, or (ii) to
the Depositor or an Affiliate thereof in compliance with applicable law
(including the Securities Act and applicable state securities and blue sky
laws). To the fullest extent permitted by law, any attempted transfer of the
Common Securities other than as set forth in the next proceeding sentence shall
be void. The Administrative Trustees shall cause each Common Securities
Certificate issued to the Depositor to contain a legend stating substantially
"THIS CERTIFICATE IS NOT TRANSFERABLE EXCEPT TO THE DEPOSITOR OR AN AFFILIATE OF
THE DEPOSITOR IN COMPLIANCE WITH APPLICABLE LAW AND SECTION 5.11 OF THE TRUST
AGREEMENT."

     Section 5.12.  Notices to Clearing Agency.

     To the extent that a notice or other communication to the Holders is
required under this Trust Agreement, for so long as Preferred Securities are
represented by a Book-Entry Preferred Securities Certificate, the Issuer
Trustees shall give all such notices and communications specified herein to be
given to the Clearing Agency, and shall have no obligations to the Owners.

     Section 5.13.  Rights of Holders; Waivers of Past Defaults.

     (a)  The legal title to the Trust Property is vested exclusively in the
Property Trustee (in its capacity as such) in accordance with Section 2.9, and
the Holders shall not have any right or title therein other than the undivided
beneficial interest in the assets of the Issuer Trust conferred by their Trust
Securities and they shall have no right to call for any partition or division of
property, profits or rights of the Issuer Trust except as described below. The
Trust Securities shall be personal property giving only the rights specifically
set forth therein and in this Trust Agreement. The Trust Securities shall have
no preemptive or similar rights and, except to the extent set forth in Section
4.8, when issued and delivered to Holders against payment of the purchase price
therefor will be fully paid and nonassessable by the Issuer Trust. Subject to
the provisions of Section 4.8, the Holders of the Trust Securities, in their
capacities as such, shall be entitled to the same limitation of personal
liability extended to stockholders of private corporations for profit organized
under the General Corporation Law of the State of Delaware.

     (b)  For so long as any Preferred Securities remain Outstanding, if, upon a
Debenture Event of Default, the Debenture Trustee fails or the holders of not
less than 25% in principal amount of the outstanding Debentures fail to declare
the principal of all of the Debentures to be immediately due and payable, the
Holders of at least 25% in Liquidation Amount of the Preferred Securities then
Outstanding shall have the right to make such declaration by a notice in writing
to the Property Trustee, the Depositor and the Debenture Trustee.

     At any time after a declaration of acceleration with respect to the
Debentures has been made and before a judgment or decree for payment of the
money due has been obtained by the Debenture Trustee as in the Indenture
provided, if the Property Trustee fails to annul any such declaration and waive
such default, the Holders of at least a Majority in Liquidation Amount of the
Preferred Securities, by written 

                                      -25-
<PAGE>
 
notice to the Property Trustee, the Depositor and the Debenture Trustee, may
rescind and annul such declaration and its consequences if:

          (i)    the Depositor has paid or deposited with the Debenture Trustee
     a sum sufficient to pay

                    (A) all overdue installments of interest on all of the
          Debentures,

                    (B) any accrued Additional Interest on all of the
          Debentures,

                    (C) the principal of (and premium, if any, on) any
          Debentures that have become due otherwise than by such declaration of
          acceleration and interest and Additional Interest thereon at the rate
          borne by the Debentures, and

                    (D) all sums paid or advanced by the Debenture Trustee under
          the Indenture and the reasonable compensation, expenses, disbursements
          and advances of the Debenture Trustee and the Property Trustee, their
          agents and counsel; and

          (ii)   all Events of Default with respect to the Debentures, other
     than the non-payment of the principal of the Debentures that has become due
     solely by such acceleration, have been cured or waived as provided in
     Section 5.13 of the Indenture.

     The Holders of at least a Majority in Liquidation Amount of the Preferred
Securities may, on behalf of the Holders of all the Preferred Securities, waive
any past default under the Indenture, except a default in the payment of
principal or interest (unless such default has been cured and a sum sufficient
to pay all matured installments of interest and principal due otherwise than by
acceleration has been deposited with the Debenture Trustee) or a default in
respect of a covenant or provision that under the Indenture cannot be modified
or amended without the consent of the holder of each outstanding Debenture. No
such rescission shall affect any subsequent default or impair any right
consequent thereon.

     Upon receipt by the Property Trustee of written notice declaring such an
acceleration, or rescission and annulment thereof, by Holders of any part of the
Preferred Securities a record date shall be established for determining Holders
of Outstanding Preferred Securities entitled to join in such notice, which
record date shall be at the close of business on the day the Property Trustee
receives such notice. The Holders on such record date, or their duly designated
proxies, and only such Persons, shall be entitled to join in such notice,
whether or not such Holders remain Holders after such record date; provided,
that, unless such declaration of acceleration, or rescission and annulment, as
the case may be, shall have become effective by virtue of the requisite
percentage having joined in such notice prior to the day that is 90 days after
such record date, such notice of declaration of acceleration, or rescission and
annulment, as the case may be, shall automatically and without further action by
any Holder be canceled and of no further effect. Nothing in this paragraph shall
prevent a Holder, or a proxy of a Holder, from giving, after expiration of such
90-day period, a new written notice of declaration of acceleration, or
rescission and annulment thereof, as the case may be, that is identical to a
written notice that has been canceled pursuant to the proviso to the preceding
sentence, in which event a new record date shall be established pursuant to the
provisions of this Section 5.13(b).

     (c)  For so long as any Preferred Securities remain Outstanding, to the
fullest extent permitted by law and subject to the terms of this Trust Agreement
and the Indenture, upon a Debenture Event of 

                                      -26-
<PAGE>
 
Default specified in Section 5.1(1) or 5.1(2) of the Indenture, any Holder of
Preferred Securities shall have the right to institute a proceeding directly
against the Depositor, pursuant to Section 5.8 of the Indenture, for enforcement
of payment to such Holder of any amounts payable in respect of Debentures having
an aggregate principal amount equal to the aggregate Liquidation Amount of the
Preferred Securities of such Holder (a "Direct Action"). Except as set forth in
Section 5.13(b) and this Section 5.13(c), the Holders of Preferred Securities
shall have no right to exercise directly any right or remedy available to the
holders of, or in respect of, the Debentures.

     (d)  Except as otherwise provided in paragraphs (a), (b) and (c) of this
Section 5.13, the Holders of at least a Majority in Liquidation Amount of the
Preferred Securities may, on behalf of the Holders of all the Preferred
Securities, waive any past default or Event of Default and its consequences.
Upon such waiver, any such default or Event of Default shall cease to exist, and
any default or Event of Default arising therefrom shall be deemed to have been
cured, for every purpose of this Trust Agreement, but no such waiver shall
extend to any subsequent or other default or Event of Default or impair any
right consequent thereon.

                                  ARTICLE VI.

                       Acts of Holders; Meetings; Voting

     Section 6.1.   Limitations on Voting Rights.

     (a)  Except as expressly provided in this Trust Agreement and in the
Indenture and as otherwise required by law, no Holder of Preferred Securities
shall have any right to vote or in any manner otherwise control the
administration, operation and management of the Issuer Trust or the obligations
of the parties hereto, nor shall anything herein set forth, or contained in the
terms of the Trust Securities Certificates, be construed so as to constitute the
Holders from time to time as partners or members of an association.

     (b)  So long as any Debentures are held by the Property Trustee on behalf
of the Issuer Trust, the Property Trustee shall not (i) direct the time, method
and place of conducting any proceeding for any remedy available to the Debenture
Trustee, or execute any trust or power conferred on the Property Trustee with
respect to the Debentures, (ii) waive any past default that may be waived under
Section 5.13 of the Indenture, (iii) exercise any right to rescind or annul a
declaration that the principal of all the Debentures shall be due and payable,
or (iv) consent to any amendment, modification or termination of the Indenture
or the Debentures, where such consent shall be required, without, in each case,
obtaining the prior approval of the Holders of at least a Majority in
Liquidation Amount of the Preferred Securities, provided, however, that where a
consent under the Indenture would require the consent of each Holder of
Debentures affected thereby, no such consent shall be given by the Property
Trustee without the prior written consent of each Holder of Preferred
Securities. The Property Trustee shall not revoke any action previously
authorized or approved by a vote of the Holders of the Preferred Securities,
except by a subsequent vote of the Holders of the Preferred Securities. The
Property Trustee shall notify all Holders of the Preferred Securities of any
notice of default received with respect to the Debentures. In addition to
obtaining the foregoing approvals of the Holders of the Preferred Securities,
prior to taking any of the foregoing actions, the Issuer Trustees shall, at the
expense of the Depositor, obtain an Opinion of Counsel 

                                      -27-
<PAGE>
 
experienced in such matters to the effect that such action shall not cause the
Issuer Trust to be taxable as a corporation or classified as other than a
grantor trust for United States federal income tax purposes.

     (c) If any proposed amendment to this Trust Agreement provides for, or the
Issuer Trustees otherwise propose to effect, (i) any action that would adversely
affect in any material respect the powers, preferences or special rights of the
Preferred Securities, whether by way of amendment to the Trust Agreement or
otherwise, or (ii) the dissolution, winding-up or termination of the Issuer
Trust, other than pursuant to the terms of this Trust Agreement, then the
Holders of Outstanding Preferred Securities as a class will be entitled to vote
on such amendment or proposal and such amendment or proposal shall not be
effective except with the approval of the Holders of at least a Majority in
Liquidation Amount of the Preferred Securities. Notwithstanding any other
provision of this Trust Agreement, no amendment to this Trust Agreement may be
made if, as a result of such amendment, it would cause the Issuer Trust to be
taxable as a corporation or classified as other than a grantor trust for United
States federal income tax purposes.

     Section 6.2.   Notice of Meetings.

     Notice of all meetings of the Holders of the Preferred Securities, stating
the time, place and purpose of the meeting, shall be given by the Property
Trustee pursuant to Section 10.8 to each Holder of Preferred Securities, at such
Holder's registered address, at least fifteen days and not more than 90 days
before the meeting. At any such meeting, any business properly before the
meeting may be so considered whether or not stated in the notice of the meeting.
Any adjourned meeting may be held as adjourned without further notice.

     Section 6.3.   Meetings of Holders of the Preferred Securities.

     No annual meeting of Holders is required to be held. The Administrative
Trustees, however, shall call a meeting of the Holders of the Preferred
Securities to vote on any matter upon the written request of the Holders of at
least 25% in aggregate Liquidation Amount of the Outstanding Preferred
Securities and the Administrative Trustees or the Property Trustee may, at any
time in their discretion, call a meeting of the Holders of the Preferred
Securities to vote on any matters as to which such Holders are entitled to vote.

     The Holders of at least a Majority in Liquidation Amount of the Preferred
Securities, present in person or by proxy, shall constitute a quorum at any
meeting of the Holders of the Preferred Securities.

     If a quorum is present at a meeting, an affirmative vote by the Holders
present, in person or by proxy, holding Preferred Securities representing at
least a Majority in aggregate Liquidation Amount of the Preferred Securities
held by the Holders present, either in person or by proxy, at such meeting shall
constitute the action of the Holders of the Preferred Securities, unless this
Trust Agreement requires a greater number of affirmative votes.

     Section 6.4.   Voting Rights.

     Holders shall be entitled to one vote for each $25 of Liquidation Amount
represented by their Outstanding Trust Securities in respect of any matter as to
which such Holders are entitled to vote.

                                      -28-
<PAGE>
 
     Section 6.5.   Proxies, etc.

     At any meeting of Holders, any Holder entitled to vote thereat may vote by
proxy, provided that no proxy shall be voted at any meeting unless it shall have
been placed on file with the Administrative Trustees, or with such other officer
or agent of the Issuer Trust as the Administrative Trustees may direct, for
verification prior to the time at which such vote shall be taken. Pursuant to a
resolution of the Property Trustee, proxies may be solicited in the name of the
Property Trustee or one or more officers of the Property Trustee. Only Holders
of record shall be entitled to vote. When Trust Securities are held jointly by
several Persons, any one of them may vote at any meeting in person or by proxy
in respect of such Trust Securities, but if more than one of them shall be
present at such meeting in person or by proxy, and such joint owners or their
proxies so present disagree as to any vote to be cast, such vote shall not be
received in respect of such Trust Securities. A proxy purporting to be executed
by or on behalf of a Holder shall be deemed valid unless challenged at or prior
to its exercise, and the burden of proving invalidity shall rest on the
challenger. No proxy shall be valid more than three years after its date of
execution.

     Section 6.6.   Holder Action by Written Consent.

     Any action that may be taken by Holders at a meeting may be taken without a
meeting if Holders holding at least a Majority in Liquidation Amount of all
Preferred Securities entitled to vote in respect of such action (or such larger
proportion thereof as shall be required by any other provision of this Trust
Agreement) shall consent to the action in writing.

     Section 6.7.   Record Date for Voting and Other Purposes.

     For the purposes of determining the Holders who are entitled to notice of
and to vote at any meeting or by written consent, or to participate in any
distribution on the Trust Securities in respect of which a record date is not
otherwise provided for in this Trust Agreement, or for the purpose of any other
action, the Administrative Trustees or Property Trustee may from time to time
fix a date, not more than 90 days prior to the date of any meeting of Holders or
the payment of a distribution or other action, as the case may be, as a record
date for the determination of the identity of the Holders of record for such
purposes.

     Section 6.8.   Acts of Holders.

     Any request, demand, authorization, direction, notice, consent, waiver or
other action provided or permitted by this Trust Agreement to be given, made or
taken by Holders may be embodied in and evidenced by one or more instruments of
substantially similar tenor signed by such Holders in person or by an agent duly
appointed in writing; and, except as otherwise expressly provided herein, such
action shall become effective when such instrument or instruments are delivered
to an Administrative Trustee. Such instrument or instruments (and the action
embodied therein and evidenced thereby) are herein sometimes referred to as the
"Act" of the Holders signing such instrument or instruments. Proof of execution
of any such instrument or of a writing appointing any such agent shall be
sufficient for any purpose of this Trust Agreement and (subject to Section 8.1)
conclusive in favor of the Issuer Trustees, if made in the manner provided in
this Section.

                                      -29-
<PAGE>
 
     The fact and date of the execution by any Person of any such instrument or
writing may be proved by the affidavit of a witness of such execution or by a
certificate of a notary public or other officer authorized by law to take
acknowledgments of deeds, certifying that the individual signing such instrument
or writing acknowledged to him the execution thereof. Where such execution is by
a signer acting in a capacity other than his individual capacity, such
certificate or affidavit shall also constitute sufficient proof of his
authority. The fact and date of the execution of any such instrument or writing,
or the authority of the Person executing the same, may also be proved in any
other manner that any Issuer Trustee receiving the same deems sufficient.

     The ownership of Trust Securities shall be proved by the Securities
Register.

     Any request, demand, authorization, direction, notice, consent, waiver or
other Act of the Holder of any Trust Security shall bind every future Holder of
the same Trust Security and the Holder of every Trust Security issued upon the
registration of transfer thereof or in exchange therefor or in lieu thereof in
respect of anything done, omitted or suffered to be done by the Issuer Trustees
or the Issuer Trust in reliance thereon, whether or not notation of such action
is made upon such Trust Security.

     Without limiting the foregoing, a Holder entitled hereunder to take any
action hereunder with regard to any particular Trust Security may do so with
regard to all or any part of the Liquidation Amount of such Trust Security or by
one or more duly appointed agents each of which may do so pursuant to such
appointment with regard to all or any part of such Liquidation Amount.

     If any dispute shall arise among the Holders or the Issuer Trustees with
respect to the authenticity, validity or binding nature of any request, demand,
authorization, direction, consent, waiver or other Act of such Holder or Issuer
Trustee under this Article VI, then the determination of such matter by the
Property Trustee shall be conclusive with respect to such matter.

     A Holder may institute a legal proceeding directly against the Depositor
under the Guarantee Agreement to enforce its rights under the Guarantee
Agreement without first instituting a legal proceeding against the Guarantee
Trustee (as defined in the Guarantee Agreement), the Issuer Trust, any Issuer
Trustee or any Person.

     Section 6.9.   Inspection of Records.

     Upon reasonable notice to the Administrative Trustees and the Property
Trustee, the records of the Issuer Trust shall be open to inspection by Holders
during normal business hours for any purpose reasonably related to such Holder's
interest as a Holder.


                                 ARTICLE VII.

                        Representations and Warranties

                                      -30-
<PAGE>
 
     Section 7.1.   Representations and Warranties of the Property Trustee and
the Delaware Trustee.

     The Property Trustee and the Delaware Trustee, each severally on behalf of
and as to itself, hereby represents and warrants for the benefit of the
Depositor and the Holders that:

     (a) the Property Trustee is a national banking association, duly organized,
validly existing and in good standing under the laws of the United States;

     (b) the Property Trustee has full corporate power, authority and legal
right to execute, deliver and perform its obligations under this Trust Agreement
and has taken all necessary action to authorize the execution, delivery and
performance by it of this Trust Agreement;

     (c) the Delaware Trustee is a Delaware corporation that satisfies for the
Trust the requirements of Section 3807 of the Delaware Business Trust Act;

     (d) the Delaware Trustee has full corporate power, authority and legal
right to execute, deliver and perform its obligations under this Trust Agreement
and has taken all necessary action to authorize the execution, delivery and
performance by it of this Trust Agreement;

     (e) this Trust Agreement has been duly authorized, executed and delivered
by the Property Trustee and the Delaware Trustee and constitutes the valid and
legally binding agreement of each of the Property Trustee and the Delaware
Trustee enforceable against each of them in accordance with its terms, subject
to bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium and
similar laws of general applicability relating to or affecting creditors' rights
and to general equity principles;

     (f) the execution, delivery and performance of this Trust Agreement has
been duly authorized by all necessary corporate or other action on the part of
the Property Trustee and the Delaware Trustee and does not require any approval
of stockholders of the Property Trustee or the Delaware Trustee and such
execution, delivery and performance will not (i) violate the Charter or By-laws
of the Property Trustee or the Delaware Trustee, (ii) violate any provision of,
or constitute, with or without notice or lapse of time, a default under, or
result in the creation or imposition of, any Lien on any properties included in
the Trust Property pursuant to the provisions of, any indenture, mortgage,
credit agreement, license or other agreement or instrument to which the Property
Trustee or the Delaware Trustee is a party or by which it is bound, or (iii)
violate any law, governmental rule or regulation of the United States or the
State of Delaware, as the case may be, governing the banking, trust or general
powers of the Property Trustee or the Delaware Trustee (as appropriate in
context) or any order, judgment or decree applicable to the Property Trustee or
the Delaware Trustee;

     (g) neither the authorization, execution or delivery by the Property
Trustee or the Delaware Trustee of this Trust Agreement nor the consummation of
any of the transactions by the Property Trustee or the Delaware Trustee (as
appropriate in context) contemplated herein requires the consent or approval of,
the giving of notice to, the registration with or the taking of any other action
with respect to any governmental authority or agency under any existing law of
the United States or the State of Delaware governing the banking, trust or
general powers of the Property Trustee or the Delaware Trustee, as the case may
be; and

                                      -31-
<PAGE>
 
     (h) there are no proceedings pending or, to the best of each of the
Property Trustee's and the Delaware Trustee's knowledge, threatened against or
affecting the Property Trustee or the Delaware Trustee in any court or before
any governmental authority, agency or arbitration board or tribunal that,
individually or in the aggregate, would materially and adversely affect the
Issuer Trust or would question the right, power and authority of the Property
Trustee or the Delaware Trustee, as the case may be, to enter into or perform
its obligations as one of the Issuer Trustees under this Trust Agreement.

     Section 7.2.   Representations and Warranties of Depositor.

     The Depositor hereby represents and warrants for the benefit of the Holders
that:

     (a) the Trust Securities Certificates issued at each Time of Delivery on
behalf of the Issuer Trust have been duly authorized and will have been duly and
validly executed, issued and delivered by the Issuer Trustees pursuant to the
terms and provisions of, and in accordance with the requirements of, this Trust
Agreement, and the Holders will be, as of each such date, entitled to the
benefits of this Trust Agreement; and

     (b) there are no taxes, fees or other governmental charges payable by the
Issuer Trust (or the Issuer Trustees on behalf of the Issuer Trust) under the
laws of the State of Delaware or any political subdivision thereof in connection
with the execution, delivery and performance by the Property Trustee or the
Delaware Trustee, as the case may be, of this Trust Agreement.


                                 ARTICLE VIII.

                              The Issuer Trustees

     Section 8.1.   Certain Duties and Responsibilities.

     (a) The duties and responsibilities of the Issuer Trustees shall be as
provided by this Trust Agreement and, in the case of the Property Trustee, by
the Trust Indenture Act. Notwithstanding the foregoing, no provision of this
Trust Agreement shall require any of the Issuer Trustees to expend or risk its
or their own funds or otherwise incur any financial liability in the performance
of any of its or their duties hereunder, or in the exercise of any of its or
their rights or powers, if it or they shall have reasonable grounds for
believing that repayment of such funds or adequate indemnity against such risk
or liability is not reasonably assured to it. Whether or not therein expressly
so provided, every provision of this Trust Agreement relating to the conduct or
affecting the liability of or affording protection to the Issuer Trustees shall
be subject to the provisions of this Section 8.1. Nothing in this Trust
Agreement shall be construed to release an Administrative Trustee from liability
for such Person's own negligent action, such Person's own negligent failure to
act, or such Person's own willful misconduct. To the extent that, at law or in
equity, an Issuer Trustee has duties and liabilities relating to the Issuer
Trust or to the Holders, such Issuer Trustee shall not be liable to the Issuer
Trust or to any Holder for such Issuer Trustee's good faith reliance on the
provisions of this Trust Agreement. The provisions of this Trust Agreement, to
the extent that they restrict the duties and liabilities of the Issuer Trustees
otherwise existing at law or in equity, are agreed by the Depositor and the
Holders to replace such other duties and liabilities of the Issuer Trustees.

                                      -32-
<PAGE>
 
     (b) All payments made by the Property Trustee or a Paying Agent in respect
of the Trust Securities shall be made only from the revenue and proceeds from
the Trust Property and only to the extent that there shall be sufficient revenue
or proceeds from the Trust Property to enable the Property Trustee or a Paying
Agent to make payments in accordance with the terms hereof. Each Holder, by its
acceptance of a Trust Security, agrees that it will look solely to the revenue
and proceeds from the Trust Property to the extent legally available for
distribution to it as herein provided and that the Issuer Trustees are not
personally liable to it for any amount distributable in respect of any Trust
Security or for any other liability in respect of any Trust Security. This
Section 8.1(b) does not limit the liability of the Issuer Trustees expressly set
forth elsewhere in this Trust Agreement or, in the case of the Property Trustee,
in the Trust Indenture Act.

     (c) The Property Trustee, before the occurrence of any Event of Default and
after the curing of all Events of Default that may have occurred, shall
undertake to perform only such duties as are specifically set forth in this
Trust Agreement (including pursuant to Section 10.10), and no implied covenants
shall be read into this Trust Agreement against the Property Trustee. If an
Event of Default has occurred (that has not been cured or waived pursuant to
Section 5.13), the Property Trustee shall exercise such of the rights and powers
vested in it by this Trust Agreement, and use the same degree of care and skill
in its exercise thereof, as a prudent person would exercise or use under the
circumstances in the conduct of such Person's own affairs.

     (d) No provision of this Trust Agreement shall be construed to relieve the
Property Trustee or the Delaware Trustee from liability for its own negligent
action, its own negligent failure to act, or its own willful misconduct, except
that:

          (i)    prior to the occurrence of any Event of Default and after the
     curing or waiving of all such Events of Default that may have occurred:

                    (A) the duties and obligations of the Property Trustee shall
          be determined solely by the express provisions of this Trust Agreement
          (including pursuant to Section 10.10), and the Property Trustee shall
          not be liable except for the performance of such duties and
          obligations as are specifically set forth in this Trust Agreement
          (including pursuant to Section 10.10); and

                    (B) in the absence of bad faith on the part of the Property
          Trustee, the Property Trustee may conclusively rely, as to the truth
          of the statements and the correctness of the opinions expressed
          therein, upon any certificates or opinions furnished to the Property
          Trustee and conforming to the requirements of this Trust Agreement;
          but in the case of any such certificates or opinions that by any
          provision hereof or of the Trust Indenture Act are specifically
          required to be furnished to the Property Trustee, the Property Trustee
          shall be under a duty to examine the same to determine whether or not
          they conform to the requirements of this Trust Agreement.

          (ii)   the Property Trustee shall not be liable for any error of
     judgment made in good faith by an authorized officer of the Property
     Trustee, unless it shall be proved that the Property Trustee was negligent
     in ascertaining the pertinent facts;

                                      -33-
<PAGE>
 
          (iii)  the Property Trustee shall not be liable with respect to any
     action taken or omitted to be taken by it in good faith in accordance with
     the direction of the Holders of at least a Majority in Liquidation Amount
     of the Preferred Securities relating to the time, method and place of
     conducting any proceeding for any remedy available to the Property Trustee,
     or exercising any trust or power conferred upon the Property Trustee under
     this Trust Agreement;

          (iv)   the Property Trustee's sole duty with respect to the custody,
     safe keeping and physical preservation of the Debentures and the Payment
     Account shall be to deal with such Property in a similar manner as the
     Property Trustee deals with similar property for its own account, subject
     to the protections and limitations on liability afforded to the Property
     Trustee under this Trust Agreement and the Trust Indenture Act;

          (v)    the Property Trustee shall not be liable for any interest on
     any money received by it except as it may otherwise agree with the
     Depositor; and money held by the Property Trustee need not be segregated
     from other funds held by it except in relation to the Payment Account
     maintained by the Property Trustee pursuant to Section 3.1 and except to
     the extent otherwise required by law;

          (vi)   the Property Trustee shall not be responsible for monitoring
     the compliance by the Administrative Trustees or the Depositor with their
     respective duties under this Trust Agreement, nor shall the Property
     Trustee be liable for the default or misconduct of any other Issuer Trustee
     or the Depositor; and

          (vii)  no provision of this Trust Agreement shall require the Property
     Trustee to expend or risk its own funds or otherwise incur personal
     financial liability in the performance of any of its duties or in the
     exercise of any of its rights or powers, if the Property Trustee shall have
     reasonable grounds for believing that the repayment of such funds or
     liability is not reasonably assured to it under the terms of this Trust
     Agreement or adequate indemnity against such risk or liability is not
     reasonably assured to it.

     (e) The Administrative Trustees shall not be responsible for monitoring the
compliance by the other Issuer Trustees or the Depositor with their respective
duties under this Trust Agreement, nor shall any Administrative Trustee be
liable for the default or misconduct of any other Administrative Trustee, the
other Issuer Trustees or the Depositor.

     Section 8.2.   Certain Notices.

     Within five Business Days after the occurrence of any Event of Default
actually known to the Property Trustee, the Property Trustee shall transmit, in
the manner and to the extent provided in Section 10.8, notice of such Event of
Default to the Holders and the Administrative Trustees, unless such Event of
Default shall have been cured or waived.

     Within five Business Days after the receipt of notice of the Depositor's
exercise of its right to defer the payment of interest on the Debentures
pursuant to the Indenture, the Property Trustee shall transmit, in the manner
and to the extent provided in Section 10.8, notice of such exercise to the
Holders and the Administrative Trustees, unless such exercise shall have been
revoked.

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<PAGE>
 
     The Property Trustee shall not be deemed to have knowledge of any Event of
Default unless the Property Trustee shall have received written notice or a
Responsible Officer of the Property Trustee charged with the administration of
this Trust Agreement shall have obtained actual knowledge of such Event of
Default.

     Section 8.3.   Certain Rights of Property Trustee.

     Subject to the provisions of Section 8.1:

     (a) the Property Trustee may rely and shall be protected in acting or
refraining from acting in good faith upon any resolution, Opinion of Counsel,
certificate, written representation of a Holder or transferee, certificate of
auditors or any other certificate, statement, instrument, opinion, report,
notice, request, consent, order, appraisal, bond, debenture, note, other
evidence of indebtedness or other paper or document believed by it to be genuine
and to have been signed or presented by the proper party or parties;

     (b) if (i) in performing its duties under this Trust Agreement the Property
Trustee is required to decide between alternative courses of action, (ii) in
construing any of the provisions of this Trust Agreement the Property Trustee
finds the same ambiguous or inconsistent with any other provisions contained
herein, or (iii) the Property Trustee is unsure of the application of any
provision of this Trust Agreement, then, except as to any matter as to which the
Holders of the Preferred Securities are entitled to vote under the terms of this
Trust Agreement, the Property Trustee shall deliver a notice to the Depositor
requesting the Depositor's opinion as to the course of action to be taken, and
the Property Trustee shall take such action, or refrain from taking such action,
as the Property Trustee shall be instructed in writing to take, or to refrain
from taking, by the Depositor; provided, however, that if the Property Trustee
does not receive such instructions of the Depositor within ten Business Days
after it has delivered such notice, or such reasonably shorter period of time
set forth in such notice (which to the extent practicable shall not be less than
two Business Days), it may, but shall be under no duty to, take or refrain from
taking such action not inconsistent with this Trust Agreement  as it shall deem
advisable and in the best interests of the Holders, in which event the Property
Trustee shall have no liability except for its own bad faith, negligence or
willful misconduct;

     (c) any direction or act of the Depositor contemplated by this Trust
Agreement shall be sufficiently evidenced by an Officers' Certificate;

     (d) any direction or act of an Administrative Trustee contemplated by this
Trust Agreement shall be sufficiently evidenced by a certificate executed by
such Administrative Trustee and setting forth such direction or act;

     (e) the Property Trustee shall have no duty to see to any recording, filing
or registration of any instrument (including any financing or continuation
statement or any filing under tax or securities laws) or any rerecording,
refiling or re-registration thereof;

     (f) the Property Trustee may consult with counsel (which counsel may be
counsel to the Depositor or any of its Affiliates, and may include any of its
employees) and the advice of such counsel shall be full and complete
authorization and protection in respect of any action taken, suffered or omitted
by it hereunder in good faith and in reliance thereon and in accordance with
such advice; the Property Trustee

                                      -35-
<PAGE>
 
shall have the right at any time to seek instructions concerning the
administration of this Trust Agreement from any court of competent jurisdiction;

     (g) the Property Trustee shall be under no obligation to exercise any of
the rights or powers vested in it by this Trust Agreement at the request or
direction of any of the Holders pursuant to this Trust Agreement, unless such
Holders shall have offered to the Property Trustee reasonable security or
indemnity against the costs, expenses and liabilities that might be incurred by
it in compliance with such request or direction; provided that, nothing
contained in this Section 8.3(g) shall be taken to relieve the Property Trustee,
upon the occurrence of an Event of Default, of its obligation to exercise the
rights and powers vested in it by this Trust Agreement;

     (h) the Property Trustee shall not be bound to make any investigation into
the facts or matters stated in any resolution, certificate, statement,
instrument, opinion, report, notice, request, consent, order, approval, bond,
debenture, note or other evidence of indebtedness or other paper or document,
unless requested in writing to do so by one or more Holders, but the Property
Trustee may make such further inquiry or investigation into such facts or
matters as it may see fit;

     (i) the Property Trustee may execute any of the trusts or powers hereunder
or perform any duties hereunder either directly or by or through its agents or
attorneys, provided that the Property Trustee shall be responsible for its own
negligence or misconduct with respect to selection of any agent or attorney
appointed by it hereunder;

     (j) whenever in the administration of this Trust Agreement the Property
Trustee shall deem it desirable to receive instructions with respect to
enforcing any remedy or right or taking any other action hereunder, the Property
Trustee (i) may request instructions from the Holders (which instructions may
only be given by the Holders of the same proportion in Liquidation Amount of the
Trust Securities as would be entitled to direct the Property Trustee under the
terms of the Trust Securities in respect of such remedy, right or action), (ii)
may refrain from enforcing such remedy or right or taking such other action
until such instructions are received, and (iii) shall be protected in acting in
accordance with such instructions; and

     (k) except as otherwise expressly provided by this Trust Agreement, the
Property Trustee shall not be under any obligation to take any action that is
discretionary under the provisions of this Trust Agreement.

     No provision of this Trust Agreement shall be deemed to impose any duty or
obligation on any Issuer Trustee to perform any act or acts or exercise any
right, power, duty or obligation conferred or imposed on it, in any jurisdiction
in which it shall be illegal, or in which such Person shall be unqualified or
incompetent in accordance with applicable law, to perform any such act or acts,
or to exercise any such right, power, duty or obligation. No permissive power or
authority available to any Issuer Trustee shall be construed to be a duty.

     Section 8.4.   Not Responsible for Recitals or Issuance of Securities.

     The recitals contained herein and in the Trust Securities Certificates
shall be taken as the statements of the Issuer Trust and the Depositor, and the
Issuer Trustees do not assume any responsibility 

                                      -36-
<PAGE>
 
for their correctness. The Issuer Trustees shall not be accountable for the use
or application by the Depositor of the proceeds of the Debentures.

     Section 8.5.   May Hold Securities.

     Any Issuer Trustee or any other agent of any Issuer Trustee or the Issuer
Trust, in its individual or any other capacity, may become the owner or pledgee
of Trust Securities and, subject to Sections 8.8 and 8.13, and except as
provided in the definition of the term "Outstanding" in Article I, may otherwise
deal with the Issuer Trust with the same rights it would have if it were not an
Issuer Trustee or such other agent.

     Section 8.6.   Compensation; Indemnity; Fees.

     The Depositor agrees:

     (a) to pay to the Issuer Trustees from time to time such reasonable
compensation for all services rendered by them hereunder as may be agreed by the
Depositor and the Issuer Trustees from time to time (which compensation shall
not be limited by any provision of law in regard to the compensation of a
trustee of an express trust);

     (b) except as otherwise expressly provided herein, to reimburse the Issuer
Trustees upon request for all reasonable expenses, disbursements and advances
incurred or made by the Issuer Trustees in accordance with any provision of this
Trust Agreement (including the reasonable compensation and the expenses and
disbursements of their agents and counsel), except any such expense,
disbursement or advance as may be attributable to their negligence, bad faith or
wilful misconduct; and

     (c) to the fullest extent permitted by applicable law, to indemnify and
hold harmless (i) each Issuer Trustee, (ii) any Affiliate of any Issuer Trustee,
(iii) any officer, director, shareholder, employee, representative or agent of
any Issuer Trustee, and (iv) any employee or agent of the Issuer Trust (referred
to herein as an "Indemnified Person") from and against any loss, damage,
liability, tax, penalty, expense or claim of any kind or nature whatsoever
incurred by such Indemnified Person by reason of the creation, operation or
termination of the Issuer Trust or any act or omission performed or omitted by
such Indemnified Person in good faith on behalf of the Issuer Trust and in a
manner such Indemnified Person reasonably believed to be within the scope of
authority conferred on such Indemnified Person by this Trust Agreement, except
that no Indemnified Person shall be entitled to be indemnified in respect of any
loss, damage or claim incurred by such Indemnified Person by reason of
negligence, bad faith or wilful misconduct with respect to such acts or
omissions.

     The provisions of this Section 8.6 shall survive the termination of this
Trust Agreement and the removal or resignation of any Issuer Trustee.

     No Issuer Trustee may claim any Lien on any Trust Property as a result of
any amount due pursuant to this Section 8.6.

     The Depositor and any Issuer Trustee (subject to Section 8.8) may engage in
or possess an interest in other business ventures of any nature or description,
independently or with others, similar or dissimilar to the business of the
Issuer Trust, and the Issuer Trust and the Holders of Trust Securities 

                                      -37-
<PAGE>
 
shall have no rights by virtue of this Trust Agreement in and to such
independent ventures or the income or profits derived therefrom, and the pursuit
of any such venture, even if competitive with the business of the Issuer Trust,
shall not be deemed wrongful or improper. Neither the Depositor nor any Issuer
Trustee shall be obligated to present any particular investment or other
opportunity to the Issuer Trust even if such opportunity is of a character that,
if presented to the Issuer Trust, could be taken by the Issuer Trust, and the
Depositor or any Issuer Trustee shall have the right to take for its own account
(individually or as a partner or fiduciary) or to recommend to others any such
particular investment or other opportunity. Any Issuer Trustee may engage or be
interested in any financial or other transaction with the Depositor or any
Affiliate of the Depositor, or may act as depository for, trustee or agent for,
or act on any committee or body of holders of, securities or other obligations
of the Depositor or its Affiliates.

     Section 8.7.   Corporate Property Trustee Required; Eligibility of Issuer
Trustees.

     (a) There shall at all times be a Property Trustee hereunder with respect
to the Trust Securities. The Property Trustee shall be a Person that is a
national or state chartered bank and eligible pursuant to the Trust Indenture
Act to act as such and that has a combined capital and surplus of at least
$50,000,000. If any such Person publishes reports of condition at least
annually, pursuant to law or to the requirements of its supervising or examining
authority, then for the purposes of this Section and to the extent permitted by
the Trust Indenture Act, the combined capital and surplus of such Person shall
be deemed to be its combined capital and surplus as set forth in its most recent
report of condition so published. If at any time the Property Trustee with
respect to the Trust Securities shall cease to be eligible in accordance with
the provisions of this Section, it shall resign immediately in the manner and
with the effect hereinafter specified in this Article. At the time of
appointment, the Property Trustee must have securities rated in one of the three
highest rating categories by a nationally recognized statistical rating
organization.

     (b) There shall at all times be one or more Administrative Trustees
hereunder with respect to the Trust Securities. Each Administrative Trustee
shall be either a natural person who is at least 21 years of age or a legal
entity that shall act through one or more persons authorized to bind that
entity.

     (c) There shall at all times be a Delaware Trustee with respect to the
Trust Securities. The Delaware Trustee shall either be (i) a natural person who
is at least 21 years of age and a resident of the State of Delaware, or (ii) a
legal entity with its principal place of business in the State of Delaware and
that otherwise meets the requirements of applicable Delaware law and that shall
act through one or more persons authorized to bind such entity.

     Section 8.8.   Conflicting Interests.

     (a) If the Property Trustee has or shall acquire a conflicting interest
within the meaning of the Trust Indenture Act, the Property Trustee shall either
eliminate such interest or resign, to the extent and in the manner provided by,
and subject to the provisions of, the Trust Indenture Act and this Trust
Agreement.

     (b) The Guarantee Agreement and the Indenture shall be deemed to be
specifically described in this Trust Agreement for the purposes of clause (i) of
the first proviso contained in Section 310(b) of the Trust Indenture Act.

                                      -38-
<PAGE>
 
     Section 8.9.   Co-Trustees and Separate Trustee.

     Unless an Event of Default shall have occurred and be continuing, at any
time or times, for the purpose of meeting the legal requirements of the Trust
Indenture Act or of any jurisdiction in which any part of the Trust Property may
at the time be located, the Depositor and the Administrative Trustees, by agreed
action of the majority of such Trustees, shall have power to appoint, and upon
the written request of the Administrative Trustees, the Depositor shall for such
purpose join with the Administrative Trustees in the execution, delivery and
performance of all instruments and agreements necessary or proper to appoint,
one or more Persons approved by the Property Trustee either to act as co-
trustee, jointly with the Property Trustee, of all or any part of such Trust
Property, or to the extent required by law to act as separate trustee of any
such property, in either case with such powers as may be provided in the
instrument of appointment, and to vest in such Person or Persons in the capacity
aforesaid, any property, title, right or power deemed necessary or desirable,
subject to the other provisions of this Section. Any co-trustee or separate
trustee appointed pursuant to this Section shall either be (i) a natural person
who is at least 21 years of age and a resident of the United States, or (ii) a
legal entity with its principal place of business in the United States that
shall act through one or more persons authorized to bind such entity. In case an
Event of Default under the Indenture shall have occurred and be continuing, the
Property Trustee alone shall have the power to make such appointment.

     Should any written instrument from the Depositor be required by any co-
trustee or separate trustee so appointed for more fully confirming to such co-
trustee or separate trustee such property, title, right or power, any and all
such instruments shall, on request, be executed, acknowledged and delivered by
the Depositor.

     Every co-trustee or separate trustee shall, to the extent permitted by law,
but to such extent only, be appointed subject to the following terms, namely:

     (a) The Trust Securities shall be executed by one or more Administrative
Trustees, and the Trust Securities shall be delivered by the Property Trustee,
and all rights, powers, duties and obligations hereunder in respect of the
custody of securities, cash and other personal property held by, or required to
be deposited or pledged with, the Property Trustee specified hereunder shall be
exercised solely by the Property Trustee and not by such co-trustee or separate
trustee.

     (b) The rights, powers, duties and obligations hereby conferred or imposed
upon the Property Trustee in respect of any property covered by such appointment
shall be conferred or imposed upon and exercised or performed by the Property
Trustee or by the Property Trustee and such co-trustee or separate trustee
jointly, as shall be provided in the instrument appointing such co-trustee or
separate trustee, except to the extent that under any law of any jurisdiction in
which any particular act is to be performed, the Property Trustee shall be
incompetent or unqualified to perform such act, in which event such rights,
powers, duties and obligations shall be exercised and performed by such co-
trustee or separate trustee.

     (c) The Property Trustee at any time, by an instrument in writing executed
by it, with the written concurrence of the Depositor, may accept the resignation
of or remove any co-trustee or separate trustee appointed under this Section,
and, in case a Debenture Event of Default has occurred and is continuing, the
Property Trustee shall have power to accept the resignation of, or remove, any
such co-trustee or separate trustee without the concurrence of the Depositor.
Upon the written request of the Property Trustee, the Depositor shall join with
the Property Trustee in the execution, delivery and performance 

                                      -39-
<PAGE>
 
of all instruments and agreements necessary or proper to effectuate such
resignation or removal. A successor to any co-trustee or separate trustee so
resigning or removed may be appointed in the manner provided in this Section.

     (d) No co-trustee or separate trustee hereunder shall be personally liable
by reason of any act or omission of the Property Trustee or any other trustee
hereunder.

     (e) The Property Trustee shall not be liable by reason of any act of a co-
trustee or separate trustee.

     (f) Any Act of Holders delivered to the Property Trustee shall be deemed to
have been delivered to each such co-trustee and separate trustee.

     Section 8.10.  Resignation and Removal; Appointment of Successor.

     No resignation or removal of any Issuer Trustee (the "Relevant Trustee")
and no appointment of a successor Issuer Trustee pursuant to this Article shall
become effective until the acceptance of appointment by the successor Issuer
Trustee in accordance with the applicable requirements of Section 8.11.

     Subject to the immediately preceding paragraph, the Relevant Trustee may
resign at any time by giving written notice thereof to the Holders. If the
instrument of acceptance by the successor Trustee required by Section 8.11 shall
not have been delivered to the Relevant Trustee within 30 days after the giving
of such notice of resignation, the Relevant Trustee may petition, at the expense
of the Trust, any court of competent jurisdiction for the appointment of a
successor Relevant Trustee.

     Unless a Debenture Event of Default shall have occurred and be continuing,
any Issuer Trustee may be removed at any time by Act of the Holders of Common
Securities. If a Debenture Event of Default shall have occurred and be
continuing, the Property Trustee or the Delaware Trustee, or both of them, may
be removed at such time by Act of the Holders of a majority in Liquidation
Amount of the Preferred Securities, delivered to the Relevant Trustee (in its
individual capacity and on behalf of the Trust). An Administrative Trustee may
be removed by the Holders of Common Securities at any time.

     If any Issuer Trustee shall resign, be removed or become incapable of
acting as Issuer Trustee, or if a vacancy shall occur in the office of any
Issuer Trustee for any cause, at a time when no Debenture Event of Default shall
have occurred and be continuing, the Holders of Common Securities, by Act of the
Holders of Common Securities delivered to the retiring Issuer  Trustee, shall
promptly appoint a successor Issuer Trustee or Issuer Trustees, and the retiring
Issuer Trustee shall comply with the applicable requirements of Section 8.11. If
the Property Trustee or the Delaware Trustee shall resign, be removed or become
incapable of continuing to act as the Property Trustee or the Delaware Trustee,
as the case may be, at a time when a Debenture Event of Default shall have
occurred and be continuing, the Holders of Preferred Securities, by Act of the
Holders of a majority in Liquidation Amount of the Preferred Securities then
Outstanding delivered to the retiring Relevant Trustee, shall promptly appoint a
successor Relevant Trustee or Trustees, and such successor Trustee shall comply
with the applicable requirements of Section 8.11. If an Administrative Trustee
shall resign, be removed or become incapable of acting as Administrative
Trustee, at a time when a Debenture Event of Default shall have occurred and be
continuing, the Holders of Common Securities by Act of the Holders of Common
Securities delivered 

                                      -40-
<PAGE>
 
to the Administrative Trustee shall promptly appoint a successor Administrative
Trustee or Administrative Trustees, and such successor Administrative Trustee or
Trustees shall comply with the applicable requirements of Section 8.11. If no
successor Relevant Trustee shall have been so appointed by the Holders of Common
Securities or the Holders of Preferred Securities and accepted appointment in
the manner required by Section 8.11, any Holder who has been a Holder of Trust
Securities for at least six months may, on behalf of himself and all others
similarly situated, petition any court of competent jurisdiction for the
appointment of a successor Relevant Trustee.

     The Property Trustee shall give notice of each resignation and each removal
of an Issuer Trustee and each appointment of a successor Issuer Trustee to all
Holders in the manner provided in Section 10.8 and shall give notice to the
Depositor. Each notice shall include the name of the successor Relevant Trustee
and the address of its Corporate Trust Office if it is the Property Trustee.

     Notwithstanding the foregoing or any other provision of this Trust
Agreement, in the event any Administrative Trustee or a Delaware Trustee who is
a natural person dies or becomes, in the opinion of the Depositor, incompetent
or incapacitated, the vacancy created by such death, incompetence or incapacity
may be filled by (a) the unanimous act of the remaining Administrative Trustees
if there were at least two of them prior to such vacancy or (b) otherwise by the
Depositor (with the successor in each case being a Person who satisfies the
eligibility requirement for Administrative Trustees or Delaware Trustee, as the
case may be, set forth in Section 8.7).

     Section 8.11.  Acceptance of Appointment by Successor.

     In case of the appointment hereunder of a successor Relevant Trustee, the
retiring Relevant Trustee and each successor Relevant Trustee with respect to
the Trust Securities shall execute and deliver an amendment hereto wherein each
successor Relevant Trustee shall accept such appointment and which (a) shall
contain such provisions as shall be necessary or desirable to transfer and
confirm to, and to vest in, each successor Relevant Trustee all the rights,
powers, trusts and duties of the retiring Relevant Trustee with respect to the
Trust Securities and the Issuer Trust, and (b) shall add to or change any of the
provisions of this Trust Agreement as shall be necessary to provide for or
facilitate the administration of the Issuer Trust by more than one Relevant
Trustee, it being understood that nothing herein or in such amendment shall
constitute such Relevant Trustees co-trustees and upon the execution and
delivery of such amendment the resignation or removal of the retiring Relevant
Trustee shall become effective to the extent provided therein and each such
successor Relevant Trustee, without any further act, deed or conveyance, shall
become vested with all the rights, powers, trusts and duties of the retiring
Relevant Trustee; but, on request of the Issuer Trust or any successor Relevant
Trustee such retiring Relevant Trustee shall duly assign, transfer and deliver
to such successor Relevant Trustee all Trust Property, all proceeds thereof and
money held by such retiring Relevant Trustee hereunder with respect to the Trust
Securities and the Issuer Trust.

     Upon request of any such successor Relevant Trustee, the Issuer Trust shall
execute any and all instruments for more fully and certainly vesting in and
confirming to such successor Relevant Trustee all such rights, powers and trusts
referred to in the preceding paragraph, as the case may be.

     No successor Relevant Trustee shall accept its appointment unless at the
time of such acceptance such successor Relevant Trustee shall be qualified and
eligible under this Article.

                                      -41-
<PAGE>
 
     Section 8.12.  Merger, Conversion, Consolidation or Succession to Business.

     Any Person into which the Property Trustee, the Delaware Trustee or any
Administrative Trustee that is not a natural Person may be merged or converted
or with which it may be consolidated, or any Person resulting from any merger,
conversion or consolidation to which such Relevant Trustee shall be a party, or
any Person succeeding to all or substantially all the corporate trust business
of such Relevant Trustee, shall be the successor of such Relevant Trustee
hereunder, provided that such Person shall be otherwise qualified and eligible
under this Article, without the execution or filing of any paper or any further
act on the part of any of the parties hereto.

     Section 8.13.  Preferential Collection of Claims Against Depositor or
Issuer Trust.

     If and when the Property Trustee shall be or become a creditor of the
Depositor or the Issuer Trust (or any other obligor upon the Preferred
Securities), the Property Trustee shall be subject to the provisions of the
Trust Indenture Act regarding the collection of claims against the Depositor or
the Issuer Trust (or any such other obligor).

     Section 8.14.  Property Trustee May File Proofs of Claim.

     In case of any receivership, insolvency, liquidation, bankruptcy,
reorganization, arrangement, adjustment, composition or other similar judicial
proceeding relative to the Issuer Trust or any other obligor upon the Trust
Securities or the property of the Issuer Trust or of such other obligor or their
creditors, the Property Trustee (irrespective of whether any Distributions on
the Trust Securities shall then be due and payable and irrespective of whether
the Property Trustee shall have made any demand on the Issuer Trust for the
payment of any past due Distributions) shall be entitled and empowered, to the
fullest extent permitted by law, by intervention in such proceeding or
otherwise:

     (a) to file and prove a claim for the whole amount of any Distributions
owing and unpaid in respect of the Trust Securities and to file such other
papers or documents as may be necessary or advisable in order to have the claims
of the Property Trustee (including any claim for the reasonable compensation,
expenses, disbursements and advances of the Property Trustee, its agents and
counsel) and of the Holders allowed in such judicial proceeding, and

     (b) to collect and receive any moneys or other property payable or
deliverable on any such claims and to distribute the same;

and any custodian, receiver, assignee, trustee, liquidator, sequestrator or
other similar official in any such judicial proceeding is hereby authorized by
each Holder to make such payments to the Property Trustee and, in the event the
Property Trustee shall consent to the making of such payments directly to the
Holders, to pay to the Property Trustee any amount due it for the reasonable
compensation, expenses, disbursements and advances of the Property Trustee, its
agents and counsel, and any other amounts due the Property Trustee.

     Nothing herein contained shall be deemed to authorize the Property Trustee
to authorize or consent to or accept or adopt on behalf of any Holder any plan
of reorganization, arrangement, adjustment or compensation affecting the Trust
Securities or the rights of any Holder thereof or to authorize the Property
Trustee to vote in respect of the claim of any Holder in any such proceeding.

                                      -42-
<PAGE>
 
     Section 8.15.  Reports by Property Trustee.

     (a) Not later than July 15 of each year commencing with July 15, 1997, the
Property Trustee shall transmit to all Holders in accordance with Section 10.8,
and to the Depositor, a brief report dated as of the immediately preceding May
15 with respect to:

          (i)    its eligibility under Section 8.7 or, in lieu thereof, if to
     the best of its knowledge it has continued to be eligible under said
     Section, a written statement to such effect;

          (ii)   a statement that the Property Trustee has complied with all of
     its obligations under this Trust Agreement during the twelve-month period
     (or, in the case of the initial report, the period since the Closing Date)
     ending with such May 15 or, if the Property Trustee has not complied in any
     material respect with such obligations, a description of such
     noncompliance; and

          (iii)  any change in the property and funds in its possession as
     Property Trustee since the date of its last report and any action taken by
     the Property Trustee in the performance of its duties hereunder which it
     has not previously reported and which in its opinion materially affects the
     Trust Securities.

     (b) In addition, the Property Trustee shall transmit to Holders such
reports concerning the Property Trustee and its actions under this Trust
Agreement as may be required pursuant to the Trust Indenture Act at the times
and in the manner provided pursuant thereto.

     (c) A copy of each such report shall, at the time of such transmission to
Holders, be filed by the Property Trustee with each national stock exchange, the
Nasdaq Stock Market or such other interdealer quotation system or self-
regulatory organization upon which the Trust Securities are listed or traded,
with the Commission and with the Depositor.

     Section 8.16.  Reports to the Property Trustee.

     Each of the Depositor and the Administrative Trustees shall provide to the
Property Trustee such documents, reports and information as required by Section
314 of the Trust Indenture Act (if any) and the compliance certificate required
by Section 314(a) of the Trust Indenture Act in the form, in the manner and at
the times required by Section 314 of the Trust Indenture Act. The Depositor and
the Administrative Trustees shall annually file with the Property Trustee a
certificate specifying whether such Person is in compliance with all of the
terms and covenants applicable to such Person hereunder.

     Section 8.17.  Evidence of Compliance with Conditions Precedent.

     Each of the Depositor and the Administrative Trustees shall provide to the
Property Trustee such evidence of compliance with any conditions precedent, if
any, provided for in this Trust Agreement that relate to any of the matters set
forth in Section 314(c) of the Trust Indenture Act. Any certificate or opinion
required to be given by an officer pursuant to Section 314(c)(1) of the Trust
Indenture Act shall be given in the form of an Officers' Certificate.

                                      -43-
<PAGE>
 
     Section 8.18   Number of Issuer Trustees.

     (a) The number of Issuer Trustees shall be four, provided that the Property
Trustee and the Delaware Trustee may be the same Person.

     (b) If an Issuer Trustee ceases to hold office for any reason, a vacancy
shall occur. The vacancy shall be filled with an Issuer Trustee appointed in
accordance with Section 8.10.

     (c) The death, resignation, retirement, removal, bankruptcy, incompetence
or incapacity to perform the duties of an Issuer Trustee shall not operate to
annul, dissolve or terminate the Issuer Trust.

     Section 8.19   Delegation of Power.

     (a) Any Administrative Trustee may, by power of attorney consistent with
applicable law, delegate to any other natural person over the age of 21 such
Person's power for the purpose of executing any documents contemplated in
Section 2.7(a), including any registration statement or amendment thereto filed
with the Commission, or making any other governmental filing; and

     (b) The Administrative Trustees shall have power to delegate from time to
time to such of their number or to the Depositor the doing of such things and
the execution of such instruments either in the name of the Issuer Trust or the
names of the Administrative Trustees or otherwise as the Administrative Trustees
may deem expedient, to the extent such delegation is not prohibited by
applicable law or contrary to the provisions of this Trust Agreement.

     Section 8.20   Appointment of Administrative Trustees.

     (a) The Administrative Trustees shall initially be Donald L. Raiff, an
individual, and Duane S. Rocheleau, an individual.  Their successors shall be
appointed by the Holders of a Majority in Liquidation Amount of the Common
Securities and they may resign or be may be removed by the Holders of a Majority
in Liquidation Amount of the Common Securities at any time.

     (b) Whenever a vacancy in the number of Administrative Trustees shall
occur, until such vacancy is filled by the appointment of an Administrative
Trustee in accordance with this Section 8.20, the Administrative Trustees in
office, regardless of their number (and notwithstanding any other provision of
this Trust Agreement), shall have all the powers granted to the Administrative
Trustees and shall discharge all the duties imposed upon the Administrative
Trustees by this Trust Agreement.


                                  ARTICLE IX.

                      Termination, Liquidation and Merger

     Section 9.1.   Termination Upon Expiration Date.

     Unless earlier terminated, the Issuer Trust shall automatically terminate
on January __, 2052 (the "Expiration Date"), following the distribution of the
Trust Property in accordance with Section 9.4.

                                      -44-
<PAGE>
 
     Section 9.2.   Early Termination.

     The first to occur of any of the following events is an "Early Termination
Event":

     (a) the occurrence of a Bankruptcy Event in respect of, or the dissolution
or liquidation of, the Depositor;

     (b) the written direction to the Property Trustee from the Depositor at any
time to terminate the Issuer Trust and to distribute the Debentures to Holders
in exchange for the Preferred Securities (which direction is optional and wholly
within the discretion of the Depositor);

     (c) the redemption of all of the Preferred Securities in connection with
the redemption of all the Debentures; and

     (d) the entry of an order for dissolution of the Issuer Trust by a court of
competent jurisdiction.

     Section 9.3.   Termination.

     The respective obligations and responsibilities of the Issuer Trustees and
the Issuer Trust created and continued hereby shall terminate upon the latest to
occur of the following: (a) the distribution by the Property Trustee to Holders
of all amounts required to be distributed hereunder upon the liquidation of the
Issuer Trust pursuant to Section 9.4, or upon the redemption of all of the Trust
Securities pursuant to Section 4.2; (b) the payment of any expenses owed by the
Issuer Trust; and (c) the discharge of all administrative duties of the
Administrative Trustees, including the performance of any tax reporting
obligations with respect to the Issuer Trust or the Holders.

     Section 9.4.   Liquidation.

     (a) If an Early Termination Event specified in clause (a), (b) or (d) of
Section 9.2 occurs or upon the Expiration Date, the Issuer Trust shall be
liquidated by the Issuer Trustees as expeditiously as the Issuer Trustees
determine to be possible by distributing, after satisfaction of liabilities to
creditors of the Issuer Trust as provided by applicable law, to each Holder a
Like Amount of Debentures, subject to Section 9.4(d). Notice of liquidation
shall be given by the Property Trustee by first-class mail, postage prepaid
mailed not less than 30 nor more than 60 days prior to the Liquidation Date to
each Holder of Trust Securities at such Holder's address appearing in the
Securities Register. All such notices of liquidation shall:

           (i)   state the Liquidation Date;

          (ii)   state that from and after the Liquidation Date, the Trust
Securities will no longer be deemed to be Outstanding and any Trust Securities
Certificates not surrendered for exchange will be deemed to represent a Like
Amount of Debentures; and

          (iii)  provide such information with respect to the mechanics by which
Holders may exchange Trust Securities Certificates for Debentures, or if Section
9.4(d) applies receive a Liquidation Distribution, as the Administrative
Trustees or the Property Trustee shall deem appropriate.

                                      -45-
<PAGE>
 
     (b) Except where Section 9.2(c) or 9.4(d) applies, in order to effect the
liquidation of the Issuer Trust and distribution of the Debentures to Holders,
the Property Trustee, either itself acting as exchange agent or through the
appointment of a separate exchange agent, shall establish a record date for such
distribution (which shall be not more than 30 days prior to the Liquidation
Date) and establish such procedures as it shall deem appropriate to effect the
distribution of Debentures in exchange for the Outstanding Trust Securities
Certificates.

     (c) Except where Section 9.2(c) or 9.4(d) applies, after the Liquidation
Date, (i) the Trust Securities will no longer be deemed to be Outstanding, (ii)
certificates representing a Like Amount of Debentures will be issued to Holders
of Trust Securities Certificates, upon surrender of such Certificates to the
exchange agent for exchange, (iii) the Depositor shall use its best efforts to
have the Debentures listed on the Nasdaq Stock Market or on such exchange, other
interdealer quotation system or self-regulatory organization as the Preferred
Securities are then listed, (iv) any Trust Securities Certificates not so
surrendered for exchange will be deemed to represent a Like Amount of Debentures
bearing accrued and unpaid interest in an amount equal to the accumulated and
unpaid Distributions on such Trust Securities Certificates until such
certificates are so surrendered (and until such certificates are so surrendered,
no payments of interest or principal will be made to Holders of Trust Securities
Certificates with respect to such Debentures) and (v) all rights of Holders
holding Trust Securities will cease, except the right of such Holders to receive
Debentures upon surrender of Trust Securities Certificates.

     (d) If, notwithstanding the other provisions of this Section 9.4, whether
because of an order for dissolution entered by a court of competent jurisdiction
or otherwise, distribution of the Debentures in the manner provided herein is
determined by the Property Trustee not to be practical, the Trust Property shall
be liquidated, and the Issuer Trust shall be dissolved, wound-up or terminated
by the Property Trustee in such manner as the Property Trustee determines. In
such event, on the date of the dissolution, winding-up or other termination of
the Issuer Trust, Holders will be entitled to receive out of the assets of the
Issuer Trust available for distribution to Holders, after satisfaction of
liabilities to creditors of the Issuer Trust as provided by applicable law, an
amount equal to the Liquidation Amount per Trust Security plus accumulated and
unpaid Distributions thereon to the date of payment (such amount being the
"Liquidation Distribution"). If, upon any such dissolution, winding up or
termination, the Liquidation Distribution can be paid only in part because the
Issuer Trust has insufficient assets available to pay in full the aggregate
Liquidation Distribution, then, subject to the next succeeding sentence, the
amounts payable by the Issuer Trust on the Trust Securities shall be paid on a
pro rata basis (based upon Liquidation Amounts). The Holders of the Common
Securities will be entitled to receive Liquidation Distributions upon any such
dissolution, winding-up or termination pro rata (determined as aforesaid) with
Holders of Preferred Securities, except that, if a Debenture Event of Default
specified in Section 5.1(1) or 5.1(2) of the Indenture has occurred and is
continuing, the Preferred Securities shall have a priority over the Common
Securities as provided in Section 4.3.

                                      -46-
<PAGE>
 
     Section 9.5.   Mergers, Consolidations, Amalgamations or Replacements of
Issuer Trust.

     The Issuer Trust may not merge, consolidate or amalgamate with or into, or
be replaced by, or convey, transfer or lease its properties and assets
substantially as an entirety to any corporation or other body, except pursuant
to this Section 9.5 or as otherwise set forth in this Trust Agreement. At the
request of the Holders of the Common Securities, with the consent of the Holders
of at least a Majority in Liquidation Amount of the Preferred Securities, the
Issuer Trust may merge, consolidate or amalgamate with or into, or be replaced
by or convey, transfer or lease its properties and assets substantially as an
entirety to a trust organized as such under the laws of any State; provided,
that (i) such successor entity either (a) expressly assumes all of the
obligations of the Issuer Trust with respect to the Preferred Securities, or (b)
substitutes for the Preferred Securities other securities having substantially
the same terms as the Preferred Securities (the "Successor Securities") so long
as the Successor Securities have the same priority as the Preferred Securities
with respect to distributions and payments upon liquidation, redemption and
otherwise, (ii) a trustee of such successor entity possessing the same powers
and duties as the Property Trustee is appointed to hold the Debentures, (iii)
such merger, consolidation, amalgamation, replacement, conveyance, transfer or
lease does not cause the Preferred Securities (including any Successor
Securities) to be downgraded by any nationally recognized statistical rating
organization which assigns ratings to the Preferred Securities, (iv) the
Successor Securities are listed, or any Successor Securities will be listed upon
notice of issuance, on any national securities exchange, automated quotation
system or other organization on which the Preferred Securities are then listed,
if any, (v) such merger, consolidation, amalgamation, replacement, conveyance,
transfer or lease does not adversely affect the rights, preferences and
privileges of the holders of the Preferred Securities (including any Successor
Securities) in any material respect, (vi) such successor entity has a purpose
substantially identical to that of the Issuer Trust, (vii) prior to such merger,
consolidation, amalgamation, replacement, conveyance, transfer or lease, the
Depositor has received an Opinion of Counsel to the effect that (a) such merger,
consolidation, amalgamation, replacement, conveyance, transfer or lease does not
adversely affect the rights, preferences and privileges of the Holders of the
Preferred Securities (including any Successor Securities) in any material
respect, and (b) following such merger, consolidation, amalgamation,
replacement, conveyance, transfer or lease, neither the Issuer Trust nor such
successor entity will be required to register as an "investment company" under
the Investment Company Act, and (viii) the Depositor or its permitted transferee
owns all of the common securities of such successor entity and guarantees the
obligations of such successor entity under the Successor Securities at least to
the extent provided by the Guarantee Agreement. Notwithstanding the foregoing,
the Issuer Trust shall not, except with the consent of holders of all of the
Preferred Securities, consolidate, amalgamate or merge with or into, or be
replaced by or convey, transfer or lease its properties and assets substantially
as an entirety to any other entity or permit any other entity to consolidate,
amalgamate or merge with or into, or replace it if such consolidation,
amalgamation, merger, replacement, conveyance, transfer or lease would cause the
Issuer Trust or the successor entity to be taxable as a corporation or
classified as other than a grantor trust for United States federal income tax
purposes.

                                      -47-
<PAGE>
 
                                  ARTICLE X.

                            MISCELLANEOUS PROVISIONS

     Section 10.1   Limitation of Rights of Holders.

     Except as set forth in Section 9.2, the death, incapacity, bankruptcy,
dissolution or termination of any Person having an interest, beneficial or
otherwise, in Trust Securities shall not operate to terminate this Trust
Agreement, nor entitle the legal representatives or heirs of such Person or any
Holder for such Person, to claim an accounting, take any action or bring any
proceeding in any court for a partition or winding up of the arrangements
contemplated hereby, nor otherwise affect the rights, obligations and
liabilities of the parties hereto or any of them.

     Section 10.2   Amendment.

     (a) This Trust Agreement may be amended from time to time by the Property
Trustee, the Administrative Trustees and the Holders of all of the Common
Securities, without the consent of any Holder of the Preferred Securities, (i)
to cure any ambiguity, correct or supplement any provision herein that may be
inconsistent with any other provision herein, or to make any other provisions
with respect to matters or questions arising under this Trust Agreement, which
shall not be inconsistent with the other provisions of this Trust Agreement;
provided, however, that such action shall not adversely affect in any material
respect the interests of any Holder, or (ii) to modify, eliminate or add to any
provisions of this Trust Agreement to such extent as shall be necessary to
ensure that the Issuer Trust will not be taxable as a corporation or classified
as other than a grantor trust for United States federal income tax purposes at
all times that any Trust Securities are outstanding or to ensure that the Issuer
Trust will not be required to register as an "investment company" under the
Investment Company Act.

     (b) Except as provided in Section 10.2(c) hereof, any provision of this
Trust Agreement may be amended by the Issuer Trustees and the Holders of all of
the Common Securities and with (i) the consent of Holders of at least a Majority
in Liquidation Amount of the Preferred Securities, and (ii) receipt by the
Issuer Trustees of an Opinion of Counsel to the effect that such amendment or
the exercise of any power granted to the Issuer Trustees in accordance with such
amendment will not cause the Issuer Trust to be taxable as a corporation or as
other than a grantor trust for United States federal income tax purposes or
affect the Issuer Trust's exemption from status as an "investment company" under
the Investment Company Act.

     (c) In addition to and notwithstanding any other provision in this Trust
Agreement, without the consent of each affected Holder (such consent being
obtained in accordance with Section 6.3 or 6.6 hereof), this Trust Agreement may
not be amended to (i) change the amount or timing of any Distribution on the
Trust Securities or otherwise adversely affect the amount of any Distribution
required to be made in respect of the Trust Securities as of a specified date,
or (ii) restrict the right of a Holder to institute suit for the enforcement of
any such payment on or after such date; and notwithstanding any other provision
herein, without the unanimous consent of the Holders (such consent being
obtained in accordance with Section 6.3 or 6.6 hereof), this paragraph (c) of
this Section 10.2 may not be amended.

     (d) Notwithstanding any other provisions of this Trust Agreement, no Issuer
Trustee shall enter into or consent to any amendment to this Trust Agreement
that would cause the Issuer Trust to fail or 

                                      -48-
<PAGE>
 
cease to qualify for the exemption from status as an "investment company" under
the Investment Company Act or to be taxable as a corporation or to be classified
as other than a grantor trust for United States federal income tax purposes.

     (e) Notwithstanding anything in this Trust Agreement to the contrary,
without the consent of the Depositor and the Administrative Trustees, this Trust
Agreement may not be amended in a manner that imposes any additional obligation
on the Depositor or the Administrative Trustees.

     (f) In the event that any amendment to this Trust Agreement is made, the
Administrative Trustees or the Property Trustee shall promptly provide to the
Depositor a copy of such amendment.

     (g) Neither the Property Trustee nor the Delaware Trustee shall be required
to enter into any amendment to this Trust Agreement that affects its own rights,
duties or immunities under this Trust Agreement. The Property Trustee shall be
entitled to receive an Opinion of Counsel and an Officers' Certificate stating
that any amendment to this Trust Agreement is in compliance with this Trust
Agreement.

     Section 10.3.  Separability.

     In case any provision in this Trust Agreement or in the Trust Securities
Certificates shall be invalid, illegal or unenforceable, the validity, legality
and enforceability of the remaining provisions shall not in any way be affected
or impaired thereby.

     Section 10.4.  Governing Law.

     THIS TRUST AGREEMENT AND THE RIGHTS AND OBLIGATIONS OF EACH OF THE HOLDERS,
THE ISSUER TRUST, THE DEPOSITOR AND THE ISSUER TRUSTEES WITH RESPECT TO THIS
TRUST AGREEMENT AND THE TRUST SECURITIES SHALL BE CONSTRUED IN ACCORDANCE WITH
AND GOVERNED BY THE LAWS OF THE STATE OF DELAWARE WITHOUT REFERENCE TO ITS
CONFLICTS OF LAWS PROVISIONS.

     Section 10.5.  Payments Due on Non-Business Day.

     If the date fixed for any payment on any Trust Security shall be a day that
is not a Business Day, then such payment need not be made on such date but may
be made on the next succeeding day that is a Business Day (except as otherwise
provided in Sections 4.1(a) and 4.2(d)), with the same force and effect as
though made on the date fixed for such payment, and no Distributions shall
accumulate on such unpaid amount for the period after such date.

     Section 10.6.  Successors.

     This Trust Agreement shall be binding upon and shall inure to the benefit
of any successor to the Depositor, the Issuer Trust and any Issuer Trustee,
including any successor by operation of law. Except in connection with a
consolidation, merger or sale involving the Depositor that is permitted under
Article VIII of the Indenture and pursuant to which the assignee agrees in
writing to perform the Depositor's obligations hereunder, the Depositor shall
not assign its obligations hereunder.

                                      -49-
<PAGE>
 
     Section 10.7.  Headings.

     The Article and Section headings are for convenience only and shall not
affect the construction of this Trust Agreement.

     Section 10.8.  Reports, Notices and Demands.

     Any report, notice, demand or other communication that by any provision of
this Trust Agreement is required or permitted to be given or served to or upon
any Holder or the Depositor may be given or served in writing by deposit
thereof, first-class postage prepaid, in the United States mail, hand delivery
or facsimile transmission, in each case, addressed, (a) in the case of a Holder
of Preferred Securities, to such Holder as such Holder's name and address may
appear on the Securities Register; and (b) in the case of the Holder of the
Common Securities or the Depositor, to Northern Trust Corporation, Fifty South
LaSalle Street, Chicago, Illinois 60675, Attention: Secretary, facsimile no.:
(312) 630-1596, or to such other address as may be specified in a written notice
by the Holder of the Common Securities or the Depositor, as the case may be, to
the Property Trustee. Such notice, demand or other communication to or upon a
Holder shall be deemed to have been sufficiently given or made, for all
purposes, upon hand delivery, mailing or transmission. Such notice, demand or
other communication to or upon the Depositor shall be deemed to have been
sufficiently given or made only upon actual receipt of the writing by the
Depositor.

     Any notice, demand or other communication that by any provision of this
Trust Agreement is required or permitted to be given or served to or upon the
Issuer, the Property Trustee, the Delaware Trustee, the Administrative Trustees
or the Trust shall be given in writing addressed to such Person as follows: (a)
with respect to the Property Trustee to The First National Bank of Chicago, One
First National Plaza, Suite 0126, Chicago, Illinois 60670, Attention: Corporate
Trust Administration; (b) with respect to the Delaware Trustee, to First Chicago
Delaware Inc., 300 King Street, Wilmington, Delaware 19801, Attention: Michael
J. Majchrzak; (c) with respect to the Administrative Trustees, to them at the
address above for notices to the Depositor, marked "Attention: Administrative
Trustees of NTC Capital I"; and (d) with respect to the Issuer Trust, to its
principal office specified in Section 2.2, with a copy to the Property Trustee.
Such notice, demand or other communication to or upon the Issuer Trust, the
Property Trustee or the Administrative Trustees shall be deemed to have been
sufficiently given or made only upon actual receipt of the writing by the Issuer
Trust, the Property Trustee or such Administrative Trustee.

     Section 10.9   Agreement Not to Petition.

     Each of the Issuer Trustees and the Depositor agree for the benefit of the
Holders that, until at least one year and one day after the Issuer Trust has
been terminated in accordance with Article IX, they shall not file, or join in
the filing of, a petition against the Issuer Trust under any bankruptcy,
insolvency, reorganization or other similar law (including the United States
Bankruptcy Code) (collectively, "Bankruptcy Laws") or otherwise join
in the commencement of any proceeding against the Issuer Trust under any
Bankruptcy Law. If the Depositor takes action in violation of this Section 10.9,
the Property Trustee agrees, for the benefit of Holders, that at the expense of
the Depositor, it shall file an answer with the bankruptcy court or otherwise
properly contest the filing of such petition by the Depositor against the Issuer
Trust or the commencement of such action and raise the defense that the
Depositor has 

                                      -50-
<PAGE>
 
agreed in writing not to take such action and should be stopped
and precluded therefrom and such other defenses, if any, as counsel for the
Issuer Trustee or the Issuer Trust may assert.

     Section 10.10. Trust Indenture Act; Conflict with Trust Indenture Act.

     (a) This Trust Agreement is subject to the provisions of the Trust
Indenture Act that are required to be part of this Trust Agreement and shall, to
the extent applicable, be governed by such provisions.

     (b) The Property Trustee shall be the only Issuer Trustee that is a trustee
for the purposes of the Trust Indenture Act.

     (c) If any provision hereof limits, qualifies or conflicts with the duties
imposed by Sections 310 to 317, inclusive, of the Trust Indenture Act through
operation of Section 318(c) thereof, such imposed duties shall control. If any
provision of this Trust Agreement modifies or excludes any provision of the
Trust Indenture Act which may be so modified or excluded, the latter provision
shall be deemed to apply to this Trust Agreement as so modified or excluded, as
the case may be.

     (d) The application of the Trust Indenture Act to this Trust Agreement
shall not affect the nature of the Trust Securities as equity securities
representing undivided beneficial interests in the assets of the Issuer Trust.

     Section 10.11. Acceptance of Terms of Trust Agreement, Guarantee Agreement
and Indenture.

     THE RECEIPT AND ACCEPTANCE OF A TRUST SECURITY OR ANY INTEREST THEREIN BY
OR ON BEHALF OF A HOLDER OR ANY OWNER, WITHOUT ANY SIGNATURE OR FURTHER
MANIFESTATION OF ASSENT, SHALL CONSTITUTE THE UNCONDITIONAL ACCEPTANCE BY THE
HOLDER AND ALL OTHERS HAVING A BENEFICIAL INTEREST IN SUCH TRUST SECURITY OF ALL
THE TERMS AND PROVISIONS OF THIS TRUST AGREEMENT, THE GUARANTEE AGREEMENT AND
THE INDENTURE, AND AGREEMENT TO THE SUBORDINATION PROVISIONS AND OTHER TERMS OF
THE GUARANTEE AGREEMENT AND THE INDENTURE, AND SHALL CONSTITUTE THE AGREEMENT OF
THE ISSUER TRUST, SUCH HOLDER AND SUCH OTHERS THAT THE TERMS AND PROVISIONS OF
THIS TRUST AGREEMENT SHALL BE BINDING, OPERATIVE AND EFFECTIVE AS BETWEEN THE
ISSUER TRUST AND SUCH HOLDER AND SUCH OTHERS.

               [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

                                      -51-
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have executed this Amended and
Restated Trust Agreement.

                                        Northern Trust Corporation,
                                                as Depositor


                                        By:____________________________________
                                            Name:
                                            Title:


                                        The First National Bank of Chicago,
                                          as Property Trustee


                                        By:____________________________________
                                            Name:
                                            Title:


                                        First Chicago Delaware Inc.,
                                          as Delaware Trustee


                                        By:____________________________________
                                            Name:
                                            Title:

                                        By:____________________________________
                                            Name: Donald L. Raiff
                                              as Administrative Trustee



                                        By:____________________________________
                                            Name: Duane S. Rocheleau
                                              as Administrative Trustee
<PAGE>
 
State of       )
               ) ss.:
County of      )


     On the _____ day of January, 1997, before me personally came
___________________, to me known, who, being by me duly sworn, did depose and
say that he/she is ____________________________ of ________________, one of the
corporations described in and which executed the foregoing instrument; that
he/she signed his/her name thereto by authority of the Board of Directors of
said corporation.



                                        ____________________________



State of       )
               ) ss.:
County of      )


     On the _____ day of January, 1997, before me personally came
_________________, to me known, who, being by me duly sworn, did depose and say
that he/she is a/an ____________________________ of ____________________, one of
the corporations described in and which executed the foregoing instrument by
authority of the Board of Directors of said corporation.



                                        ____________________________
<PAGE>
 
State of       )
               ) ss.:
County of      )


     On the _____ day of January, 1997, before me personally came
_________________, to me known, who, being by me duly sworn, did depose and say
that he/she is a/an ____________________________ of ____________________, one of
the corporations described in and which executed the foregoing instrument by
authority of the Board of Directors of said corporation.



                                        ____________________________
<PAGE>
 
                                                                       Exhibit A



                             CERTIFICATE OF TRUST

                                      OF

                                 NTC CAPITAL I


          This Certificate of Trust of NTC Capital I (the "Trust"), dated as of
December 27, 1996, is being duly executed and filed by the undersigned, as
trustees, to form a business trust under the Delaware Business Trust Act (12
Del. C. (S) 3801 et seq.)

          1.   Name.  The name of the business trust being formed hereby is NTC
Capital I.

          2.   Delaware Trustee.  The name and business address of the trustee
of the Trust in the State of Delaware are First Chicago Delaware Inc., 300 King
Street, Wilmington, Delaware 19801 .

          3.   Effective Date.  This Certificate of Trust shall be effective
upon filing.

          IN WITNESS WHEREOF, the undersigned, being the only trustees of the
Trust, have executed this Certificate of Trust as of the date first-above
written.

                                    FIRST CHICAGO DELAWARE INC., as trustee

                                    By: /s/ Richard D. Manella
                                        ---------------------------
                                        Name:  Richard D. Manella
                                        Title: Vice President

                                    /s/ Donald L. Raiff
                                    --------------------------
                                    Name:  Donald L. Raiff, as trustee

                                      A-1
<PAGE>
 
                                                                       Exhibit B


                      [FORM OF LETTER OF REPRESENTATIONS]


                                        January __, 1997



The Depository Trust Company,
   55 Water Street, 49th Floor,
      New York, New York 10041-0099.

Attention:  General Counsel's Office

               Re:NTC Capital I
               [_]% Preferred Securities, Series A
               CUSIP
               ------------------------------------

Ladies and Gentlemen:

          The purpose of this letter is to set forth certain matters relating to
the issuance and deposit with The Depository Trust Company ("DTC") of the book-
entry-only portion of the [_]% Preferred Securities, Series A (the "Preferred
Securities"), of NTC Capital I, a statutory business trust created under the
laws of the State of Delaware (the "Issuer"), governed by the Amended and
Restated Trust Agreement, dated as of January __, 1997, among Northern Trust
Corporation (the "Corporation"), as Depositor, The First National Bank of
Chicago, as Property Trustee, First Chicago Delaware Inc., as Delaware Trustee,
the Administrative Trustees named therein, and the holders, from time to time,
of undivided beneficial interests in the assets of the Issuer. The payment of
distributions on the Preferred Securities and payments due upon liquidation of
the Issuer or redemption of the Preferred Securities, to the extent the Issuer
has funds available for the payment thereof, are guaranteed by the Corporation
to the extent set forth in a Guarantee Agreement, dated as of January __, 1997,
between the Corporation and The First National Bank of Chicago, as Guarantee
Trustee with respect to the Preferred Securities. The Corporation and the Issuer
propose to sell the Preferred Securities to the Underwriters (the
"Underwriters") pursuant to a Pricing Agreement, dated as of January __, 1997,
by and among the Underwriters, the Issuer and the Corporation, which
incorporates the provisions of the Underwriting Agreement Standard Provisions
(January 1997), and the Underwriters wish to take delivery of the Preferred
Securities through DTC. The First National Bank of Chicago is acting as transfer
agent and registrar with respect to the Preferred Securities (the "Transfer
Agent and Registrar").

          To induce DTC to accept the Preferred Securities as eligible for
deposit at DTC, and to act in accordance with DTC's rules with respect to the
Preferred Securities, the Issuer and the Transfer Agent and Registrar make the
following representations to DTC:

                                      B-1
<PAGE>
 
          1.   Prior to the closing of the sale of the Preferred Securities to
the Underwriters on January __, 1997, there shall be deposited with, or held by
the Transfer Agent and Registrar as custodian for, DTC one or more global
certificates (individually and collectively, the "Global Certificate")
registered in the name of DTC's nominee, Cede & Co., representing an aggregate
of 6,000,000 Preferred Securities and bearing the following legend:

     Unless this certificate is presented by an authorized representative
     of The Depository Trust Company, a New York corporation ("DTC"), to
     Issuer or its agent for registration of transfer, exchange, or
     payment, and any certificate issued is registered in the name of Cede
     & Co. or in such other name as is requested by an authorized
     representative of DTC (and any payment is made to Cede & Co. or to
     such other entity as is requested by an authorized representative of
     DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHER
     WISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
     hereof, Cede & Co., has an interest herein.

          2.   The Amended and Restated Trust Agreement of the Issuer provides
for the voting by holders (with no provision for revocation of consents or votes
by subsequent holders) of the Preferred Securities under certain limited
circumstances. The Issuer shall establish a record date for such purposes and
shall, to the extent possible, give DTC notice of such record date not less than
15 calendar days in advance of such record date.

          3.   In the event of a stock split, conversion, recapitalization,
reorganization or any other similar transaction resulting in the cancellation of
all or any part of the Preferred Securities outstanding, the Issuer or the
Transfer Agent and Registrar shall send DTC a notice of such event as soon as
possible but, at least 5 business days prior to the effective date of such
event.

          4.   In the event of any distribution on, or an offering or issuance
of rights with respect to, the Preferred Securities outstanding, the Issuer or
the Transfer Agent and Registrar shall send DTC a notice specifying: (a) the
amount of and conditions, if any, applicable to the payment of any such
distribution or any such offering or issuance of rights; (b) any applicable
expiration or deadline date, or any date by which any action on the part of the
holders of Preferred Securities is required; and (c) the date any required
notice is to be mailed by or on behalf of the Issuer to holders of Preferred
Securities or published by or on behalf of the Issuer (whether by mail or
publication, the "Publication Date"). Such notice shall be sent to DTC by a
secure means (e.g., legible telecopy, registered or certified mail, overnight
              - -                                                            
delivery) in a timely manner designed to assure that such notice is in DTC's
possession no later than the close of business on the business day before the
Publication Date. The Issuer or the Transfer Agent and Registrar will forward
such notice either in a separate secure transmission for each CUSIP number or in
a secure transmission of multiple CUSIP numbers (if applicable) that includes a
manifest or list of each CUSIP number submitted in that transmission. (The party
sending such notice shall have a method to verify subsequently the use of such
means and the timeliness of such notice.) The Publication Date shall be not less
than 30 calendar days nor more than 60 calendar days prior to the payment of any
such distribution or any such offering or issuance of rights with respect to the
Preferred Securities. After establishing the amount of payment to be made on the
Preferred Securities, the Issuer or the Transfer Agent and Registrar will notify
DTC's Dividend Department of such payment 5 business days prior to payment date.
Notices to DTC's Dividend Department by telecopy shall be sent to (212) 709-
1723. Such notices by mail or by any other means shall be sent to:

                                      B-2
<PAGE>
 
                            Manager, Announcements
                            Dividend Department
                            The Depository Trust Company
                            7 Hanover Square, 23rd Floor
                            New York, New York 10004-2695

          The Issuer or the Transfer Agent and Registrar shall confirm DTC's
receipt of such telecopy by telephoning the Dividend Department at (212) 709-
1270.

          5.   In the event of a redemption by the Issuer of the Preferred
Securities, notice specifying the terms of the redemption and the Publication
Date of such notice shall be sent by the Issuer or the Transfer Agent and
Registrar to DTC not less than 30 calendar days prior to such event by a secure
means in the manner set forth in paragraph 4. Such redemption notice shall be
sent to DTC's Call Notification Department at (516) 227-4164 or (516) 227-4190,
and receipt of such notice shall be confirmed by telephoning (516) 227-4070.
Notice by mail or by any other means shall be sent to:

                            Call Notification Department
                            The Depository Trust Company
                            711 Stewart Avenue
                            Garden City, New York 11530-4719

          6.   In the event of any invitation to tender the Preferred
Securities, notice specifying the terms of the tender and the Publication Date
of such notice shall be sent by the Issuer or the Transfer Agent and Registrar
to DTC by a secure means and in a timely manner as described in paragraph 4.
Notices to DTC pursuant to this paragraph and notices of other corporate actions
(including mandatory tenders, exchanges and capital changes), shall be sent,
unless notification to another department is expressly provided for herein, by
telecopy to DTC's Reorganization Department at (212) 709-1093 or (212) 709-1094
and receipt of such notice shall be confirmed by telephoning (212) 709-6884, or
by mail or any other means to:

                            Manager, Reorganization Department
                            Reorganization Window
                            The Depository Trust Company
                            7 Hanover Square, 23rd Floor
                            New York, New York 10004-2695

          7.   All notices and payment advices sent to DTC shall contain the
CUSIP number or numbers of the Preferred Securities and the accompanying
designation of the Preferred Securities, which, as of the date of this letter,
is "NTC Capital I, [_]% Preferred Securities, Series A".

                                      B-3
<PAGE>
 
          8.    Distribution payments or other cash payments with respect to the
Preferred Securities shall be governed by DTC's current Principal and Income
Payments Rider, a copy of which is attached hereto as Annex I. For purposes of
this letter, the term "Agent" used in Annex I shall be deemed to refer to The
First National Bank of Chicago or any successor Property Trustee under the
Amended and Restated Trust Agreement.

          9.   DTC may direct the Issuer and the Transfer Agent and Registrar to
use any other telecopy number or address of DTC as the number or address to
which notices or payments may be sent.

          10.  In the event of a conversion, redemption, or any other similar
transaction (e.g., tender made and accepted in response to the Issuer's or the
             - -                                                              
Transfer Agent and Registrar's invitation) necessitating a reduction in the
aggregate number of Preferred Securities outstanding evidenced by the Global
Certificate, DTC, in its discretion: (a) may request the Issuer or the Transfer
Agent and Registrar to issue and countersign a new Global Certificate; or (b)
may make an appropriate notation on the Global Certificate indicating the date
and amount of such reduction.

          11.  DTC may discontinue its services as a securities depositary with
respect to the Preferred Securities at any time by giving reasonable prior
written notice to the Issuer and the Transfer Agent and Registrar (at which time
DTC will confirm with the Issuer or the Transfer Agent and Registrar the
aggregate number of Preferred Securities deposited with it) and discharging its
responsibilities with respect thereto under applicable law. Under such
circumstances, the Issuer may determine to make alternative arrangements for
book-entry settlement for the Preferred Securities, make available one or more
separate global certificates evidencing Preferred Securities to any Participant
having Preferred Securities credited to its DTC account, or issue definitive
Preferred Securities to the beneficial holders thereof, and in any such case,
DTC agrees to cooperate fully with the Issuer and the Transfer Agent and
Registrar and to return the Global Certificate, duly endorsed for transfer as
directed by the Issuer or the Transfer Agent and Registrar, together with any
other documents of transfer reasonably requested by the Issuer or the Transfer
Agent and Registrar.

          12.  In the event that the Issuer determines that beneficial owners of
Preferred Securities shall be able to obtain definitive Preferred Securities,
the Issuer or the Transfer Agent and Registrar shall notify DTC of the
availability of certificates. In such event, the Issuer or the Transfer Agent
and Registrar shall issue, transfer and exchange certificates in appropriate
amounts, as required by DTC and others, and DTC agrees to cooperate fully with
the Issuer and the Transfer Agent and Registrar and to return the Global
Certificate, duly endorsed for transfer as directed by the Issuer or the
Transfer Agent and Registrar, together with any other documents of transfer
reasonably requested by the Issuer or the Transfer Agent and Registrar.

          13.  This letter may be executed in any number of counterparts, each
of which when so executed shall be deemed to be an original, but all such
counterparts shall together constitute but one and the same instrument.

                                      B-4
<PAGE>
 
          Nothing herein shall be deemed to require the Transfer Agent and
Registrar to advance funds on behalf of NTC Capital I.

                                    Very truly yours,

                                    NTC CAPITAL I
                                    (As Issuer)



                                    By:___________________________
                                     __________________________
                                     Administrative Trustee

                                    THE FIRST NATIONAL BANK OF
                                      CHICAGO
                                    (As Transfer Agent and Registrar)



                                    By:___________________________
                                       Name:
                                       Title:


          RECEIVED AND ACCEPTED:

          THE DEPOSITORY TRUST COMPANY

          By:__________________________
             Authorized Officer

                                      B-5
<PAGE>
 
                                                                       Exhibit C

                    [FORM OF COMMON SECURITIES CERTIFICATE]

      THIS CERTIFICATE IS NOT TRANSFERABLE EXCEPT TO THE DEPOSITOR OR AN
       AFFILIATE OF THE DEPOSITOR IN COMPLIANCE WITH APPLICABLE LAW AND
                      SECTION 5.11 OF THE TRUST AGREEMENT

Certificate Number                                  Number of Common Securities

       CI-

                   Certificate Evidencing Common Securities

                                      of

                                 NTC Capital I

                          [     ]% Common Securities
                 (liquidation amount $25 per Common Security)

     NTC Capital I, a statutory business trust created under the laws of the
State of Delaware (the "Issuer Trust"), hereby certifies that [NAME OF HOLDER]
(the "Holder") is the registered owner of                         common
securities of the Issuer Trust representing undivided beneficial interests in
the assets of the Issuer Trust and designated the [_]% Common Securities
(liquidation amount $25 per Common Security) (the "Common Securities"). Except
in accordance with Section 5.11 of the Trust Agreement (as defined below) the
Common Securities are not transferable and any attempted transfer hereof other
than in accordance therewith shall be void. The designations, rights,
privileges, restrictions, preferences and other terms and provisions of the
Common Securities are set forth in, and this certificate and the Common
Securities represented hereby are issued and shall in all respects be subject to
the terms and provisions of, the Amended and Restated Trust Agreement of the
Issuer Trust, dated as of January __, 1997, as the same may be amended from time
to time (the "Trust Agreement"), among Northern Trust Corporation, as Depositor,
The First National Bank of Chicago, as Property Trustee, First Chicago Delaware
Inc., as Delaware Trustee, the Administrative Trustees named therein, and the
holders, from time to time, of undivided beneficial interests in the assets of
the Issuer, including the designation of the terms of the Common Securities as
set forth therein. The Issuer Trust will furnish a copy of the Trust Agreement
to the Holder without charge upon written request to the Issuer Trust at its
principal place of business or registered office.

     Upon receipt of this certificate, the Holder is bound by the Trust
Agreement and is entitled to the benefits thereunder.

     Terms used but not defined herein have the meanings set forth in the Trust
Agreement.

     In Witness Whereof, one of the Administrative Trustees of the Issuer Trust
has executed this certificate this __th day of January, 1997.


                                  NTC Capital I

                                      C-1
<PAGE>
 
                                    By: ________________________________________
                                        Name:
                                        Administrative Trustee

                                      C-2
<PAGE>
 
                                                                       Exhibit D

                          [FORM OF EXPENSE AGREEMENT]

                   AGREEMENT AS TO EXPENSES AND LIABILITIES

     Agreement as to Expenses and Liabilities, dated as of January __, 1997,
between Northern Trust Corporation, a Delaware corporation (the "Corporation"),
and NTC Capital I, a Delaware business trust (the "Issuer Trust").

     Whereas, the Issuer Trust intends to issue its Common Securities (the
"Common Securities") to and acquire Debentures from the Corporation and to issue
and sell [   ]% Preferred Securities, Series A (the "Preferred Securities") with
such powers, preferences and special rights and restrictions as are set forth in
the Amended and Restated Trust Agreement of the Issuer Trust, dated as of
January __, 1997, among the Corporation, as Depositor, The First National Bank
of Chicago, as Property Trustee, First Chicago Delaware Inc., as Delaware
Trustee, the Administrative Trustees named therein, and the holders, from time
to time, of undivided beneficial interests in the assets of the Issuer, as the
same may be amended from time to time (the "Trust Agreement");

     Whereas, the Corporation will own all of the Common Securities of the Trust
and will issue the Debentures;

     Whereas, terms used but not defined herein have the meanings set forth in
the Trust Agreement;

     Now, Therefore, for good and valid consideration, the receipt and
sufficiency of which are hereby acknowledged:


                                   ARTICLE I

     Section 1.1.   Guarantee by the Corporation. Subject to the terms and
conditions hereof, the Corporation hereby irrevocably and unconditionally
guarantees to each person or entity to whom the Issuer Trust is now or hereafter
becomes indebted or liable (the "Beneficiaries") the full payment, when and as
due, of any and all Obligations (as hereinafter defined) to such Beneficiaries.
As used herein, "Obligations" means any costs, expenses or liabilities of the
Issuer Trust, other than obligations of the Issuer Trust to pay to holders of
any Trust Securities the amounts due such holders pursuant to the terms of the
Trust Securities. This Agreement is intended to be for the benefit of, and to be
enforceable by, all such Beneficiaries, whether or not such Beneficiaries have
received notice hereof.

     Section 1.2. Subordination of Guarantee. The guarantee and other
liabilities and obligations of the Corporation under this Agreement shall
constitute unsecured obligations of the Corporation and shall rank subordinate
and junior in right of payment to all Senior Indebtedness (as defined in the
Indenture) of the Corporation to the extent and in the manner set forth in the
Indenture with respect to the Debentures, and the provisions of Article XIII of
the Indenture will apply, mutatis mutandis, to the obligations of the
Corporation hereunder. The obligations of the Corporation hereunder do not
constitute Senior Indebtedness (as defined in the Indenture) of the Corporation.

     Section 1.3. Term of Agreement. This Agreement shall terminate and be of no
further force and effect upon the dissolution of the Issuer Trust, provided,
however, that this Agreement shall continue to 

                                      D-1

<PAGE>
 
be effective or shall be reinstated, as the case may be, if at any time any
holder of Preferred Securities or any Beneficiary must restore payment of any
sums paid under the Preferred Securities, under any Obligation, under the
Guarantee Agreement dated the date hereof by the Depositor and The First
National Bank of Chicago as guarantee trustee, or under this Agreement for any
reason whatsoever. This Agreement is continuing, irrevocable, unconditional and
absolute.

     Section 1.4. Waiver of Notice. The  Corporation hereby waives notice of
acceptance of this Agreement and of any Obligation to which it applies or may
apply, and the Corporation hereby waives presentment, demand for payment,
protest, notice of nonpayment, notice of dishonor, notice of redemption and all
other notices and demands.

     Section 1.5. No Impairment. The obligations, covenants, agreements and
duties of the Corporation under this Agreement shall in no way be affected or
impaired by reason of the happening from time to time of any of the following:

     (a)  the extension of time for the payment by the Issuer Trust of all or
any portion of the Obligations or for the performance of any other obligation
under, arising out of, or in connection with, the Obligations;

     (b)  any failure, omission, delay or lack of diligence on the part of the
Beneficiaries to enforce, assert or exercise any right, privilege, power or
remedy conferred on the Beneficiaries with respect to the Obligations or any
action on the part of the Issuer Trust granting indulgence or extension of any
kind; or

     (c)  the voluntary or involuntary liquidation, dissolution, sale of any
collateral, receivership, insolvency, bankruptcy, assignment for the benefit of
creditors, reorganization, arrangement, composition or readjustment of debt of,
or other similar proceedings affecting, the Issuer Trust or any of the assets of
the Issuer Trust (other than the liquidation of the Issuer Trust in accordance
with the terms thereof).

There shall be no obligation of the Beneficiaries to give notice to, or obtain
the consent of, the Corporation with respect to the happening of any of the
foregoing.

     Section 1.6. Enforcement. A Beneficiary may enforce this Agreement directly
against the Corporation and the Corporation waives any right or remedy to
require that any action be brought against the Issuer Trust or any other person
or entity before proceeding against the Corporation.

     Section 1.7. Subrogation. The Corporation shall be subrogated to all rights
(if any) of the Issuer Trust in respect of any amounts paid to the Beneficiaries
by the Corporation under this Agreement; provided, however, that the Corporation
shall not (except to the extent required by mandatory provisions of law) be
entitled to enforce or exercise any rights which it may acquire by way of
subrogation or any indemnity, reimbursement or other agreement, in all cases as
a result of payment under this Agreement, if, at the time of any such payment,
any amounts are due and unpaid under this Agreement.


                                  ARTICLE II

                                   D-2     

<PAGE>
 
     Section 2.1. Assignment. This Agreement may not be assigned by either party
hereto without the consent of the other, and any purported assignment without
such consent shall be void.


     Section 2.2. Binding Effect. All guarantees and agreements contained in
this Agreement shall bind the successors, assigns, receivers, trustees and
representatives of the Corporation and shall inure to the benefit of the
Beneficiaries.

     Section 2.3. Amendment. So long as there remains any Beneficiary or any
Preferred Securities are outstanding, this Agreement shall not be modified or
amended in any manner adverse to such Beneficiary or to the holders of the
Preferred Securities without the consent of such Beneficiary or the holders of
the Preferred Securities, as the case may be.

     Section 2.4. Notices. Any notice, request or other communication required
or permitted to be given hereunder shall be given in writing by delivering the
same against receipt therefor by facsimile transmission (confirmed by mail),
telex or by registered or certified mail, addressed as follows (and if so given,
shall be deemed given when mailed or upon receipt of an answer-back, if sent by
telex):

          NTC Capital I
          c/o The First National Bank of Chicago
          One First National Plaza, Suite 0126
          Chicago, Illinois  60670
          Facsimile No.:  (312) 407-1708
          Attention:  Corporate Trust Administration

          With a copy to:

               Northern Trust Corporation
               Fifty South LaSalle Street
               Chicago, Illinois 60675
               Facsimile No.: (312) 630-1596
               Attention: Secretary


     Section 2.4. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED AND
INTERPRETED IN ACCORDANCE WITH THE LAWS OF THE STATE OF ILLINOIS (WITHOUT REGARD
TO CONFLICT OF LAWS PRINCIPLES).

                                      D-3

<PAGE>
 
     This Agreement is executed as of the day and year first above written.


                                  Northern Trust Corporation


                                  By: __________________________________________
                                  Name:
                                  Title:

                                  NTC Capital I


                                  By: __________________________________________
                                  Name:
                                  Administrative Trustee

                                      D-4
 
<PAGE>
 
                                                                       Exhibit E


                  [FORM OF PREFERRED SECURITIES CERTIFICATE]

     [If the Preferred Securities Certificate is to be Evidenced By a Book-Entry
Preferred Securities Certificate, insert--This Preferred Securities Certificate
is a Book-Entry Preferred Securities Certificate within the meaning of the Trust
Agreement hereinafter referred to and is registered in the name of a Depositary
or a nominee of a Depositary. This Preferred Securities Certificate is
exchangeable for Preferred Securities Certificates registered in the name of a
person other than the Depositary or its nominee only in the limited
circumstances described in the Trust Agreement and may not be transferred except
as a whole by the Depositary to a nominee of the Depositary or by a nominee of
the Depositary to the Depositary or another nominee of the Depositary, except in
the limited circumstances described in the Trust Agreement.

     Unless this Preferred Securities Certificate is presented by an authorized
representative of The Depository Trust Company, a New York Corporation ("DTC"),
to NTC Capital I or its agent for registration of transfer, exchange or payment,
and any Preferred Securities Certificate issued is registered in the name of
Cede & Co. or such other name as is requested by an authorized representative of
DTC (and any payment is made to Cede & Co. or to such other entity as is
requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER
USE HEREOF FOR VALUE OR OTHERWISE BY OR TO A PERSON IS WRONGFUL inasmuch as the
registered owner hereof, Cede & Co., has an interest herein.]

                                      E-1
<PAGE>
 
CERTIFICATE NUMBER                                NUMBER OF PREFERRED SECURITIES

     PAI-

                             CUSIP NO. 

                  CERTIFICATE EVIDENCING PREFERRED SECURITIES

                                      OF

                                 NTC CAPITAL I

                     [_]% PREFERRED SECURITIES, SERIES A
                (LIQUIDATION AMOUNT $25 PER PREFERRED SECURITY)


     NTC Capital I, a statutory business trust created under the laws of the
State of Delaware (the "Issuer Trust"), hereby certifies that
_____________________________ (the "Holder") is the registered owner of
    (    ) Preferred Securities of the Issuer Trust representing an undivided 
- ----------
beneficial interest in the assets of the Issuer Trust and designated the NTC
Capital I [_]% Preferred Securities, Series A (liquidation amount $25 per
Preferred Security) (the "Preferred Securities"). The Preferred Securities are
transferable on the books and records of the Issuer Trust, in person or by a
duly authorized attorney, upon surrender of this certificate duly endorsed and
in proper form for transfer as provided in Section 5.5 of the Trust Agreement
(as defined below). The designations, rights, privileges, restrictions,
preferences and other terms and provisions of the Preferred Securities are set
forth in, and this certificate and the Preferred Securities represented hereby
are issued and shall in all respects be subject to the terms and provisions of,
the Amended and Restated Trust Agreement of the Issuer Trust, dated as of
January __, 1997, as the same may be amended from time to time (the "Trust
Agreement"), among Northern Trust Corporation, as Depositor, The First National
Bank of Chicago, as Property Trustee, First Chicago Delaware Inc., as Delaware
Trustee, the Administrative Trustees named therein, and the holders, from time
to time, of undivided beneficial interests in the assets of the Issuer,
including the designation of the terms of the Preferred Securities as set forth
therein. The Holder is entitled to the benefits of the Guarantee Agreement
entered into by Northern Trust Corporation, a Delaware corporation, and The
First National Bank of Chicago, as guarantee trustee, dated as of January __,
1997 (the "Guarantee Agreement"), to the extent provided therein. The Issuer
Trust will furnish a copy of the Issuer Trust Agreement and the Guarantee
Agreement to the Holder without charge upon written request to the Issuer Trust
at its principal place of business or registered office.

     Upon receipt of this certificate, the Holder is bound by the Trust
Agreement and is entitled to the benefits thereunder.

                                      E-2
<PAGE>
 
     In Witness Whereof, one of the Administrative Trustees of the Issuer Trust
has executed this certificate this ____ day of January, 1997.

                                        NTC Capital I


                                        By: ____________________________________
                                            Name:
                                            Administrative Trustee

                                      E-3
<PAGE>
 
                                  ASSIGNMENT

   For Value Received, the undersigned assigns and transfers this Preferred
                                 Security to:


________________________________________________________________________________
       (Insert assignee's social security or tax identification number)


________________________________________________________________________________
                   (Insert address and zip code of assignee)


and irrevocably appoints _______________________________________________________


________________________________________________________________________________
agent to transfer this Preferred Securities Certificate on the books of the
Issuer Trust. The agent may substitute another to act for him or her.

Date: ________________

Signature: _____________________________________________________________________
    (Sign exactly as your name appears on the other side of this Preferred
                            Securities Certificate)

The signature(s) should be guaranteed by an eligible guarantor institution
(banks, stockbrokers, savings and loan associations and credit unions with
membership in an approved signature guarantee medallion program), pursuant to
S.E.C. Rule 17Ad-15.

                                      E-4

<PAGE>
 
                                                                    EXHIBIT 4(j)



================================================================================


                              GUARANTEE AGREEMENT

                                BY AND BETWEEN


                          NORTHERN TRUST CORPORATION,
                                 as Guarantor


                                      and


                      THE FIRST NATIONAL BANK OF CHICAGO,
                             as Guarantee Trustee


                                  RELATING TO

                                 NTC CAPITAL I

                             _____________________


                         Dated as of January __, 1997


                             _____________________



================================================================================
<PAGE>
 
                            CROSS-REFERENCE TABLE*

<TABLE>
<CAPTION>
Section of
Trust Indenture Act                                             Section of
of 1939, as amended                                         Guarantee Agreement
- -------------------                                         -------------------
<S>                                                         <C>  
310(a)............................................................4.1(a)
310(b)............................................................4.1(c), 2.8
310(c)............................................................Inapplicable
311(a)............................................................2.2(b)
311(b)............................................................2.2(b)
311(c)............................................................Inapplicable
312(a)............................................................2.2(a)
312(b)............................................................2.2(b)
313...............................................................2.3
314(a)............................................................2.4
314(b)............................................................Inapplicable
314(c)............................................................2.5
314(d)............................................................Inapplicable
314(e)............................................................1.1, 2.5, 3.2
314(f)............................................................2.1, 3.2
315(a)............................................................3.1(d)
315(b)............................................................2.7
315(c)............................................................3.1
315(d)............................................................3.1(d)
316(a)............................................................1.1, 2.6, 5.4
316(b)............................................................5.3
316(c)............................................................8.2
317(a)............................................................Inapplicable
317(b)............................................................Inapplicable
318(a)............................................................2.1
318(b)............................................................2.1
318(c)............................................................2.1
</TABLE>

____________
* This Cross-Reference Table does not constitute part of the Guarantee Agreement
 and shall not affect the interpretation of any of its terms or provisions.

                                      -i-
<PAGE>
 
                               TABLE OF CONTENTS

<TABLE> 
<CAPTION> 
                                                                                            Page 
<S>                                                                                         <C> 

                                   ARTICLE I

                                  Definitions

Section 1.1. Definitions....................................................................   1


                                  ARTICLE II

                              Trust Indenture Act

Section 2.1. Trust Indenture Act; Application...............................................   4
Section 2.2. List of Holders................................................................   5
Section 2.3. Reports by the Guarantee Trustee...............................................   5
Section 2.4. Periodic Reports to the Guarantee Trustee......................................   5
Section 2.5. Evidence of Compliance with Conditions Precedent...............................   5
Section 2.6. Events of Default; Waiver......................................................   5
Section 2.7. Event of Default; Notice.......................................................   6
Section 2.8. Conflicting Interests..........................................................   6

                                  ARTICLE III

              Powers, Duties and Rights of the Guarantee Trustee

Section 3.1. Powers and Duties of the Guarantee Trustee.....................................   6
Section 3.2. Certain Rights of Guarantee Trustee............................................   8
Section 3.3. Compensation; Indemnity; Fees..................................................   9

                                  ARTICLE IV

                               Guarantee Trustee

Section 4.1. Guarantee Trustee; Eligibility.................................................  10
Section 4.2. Appointment, Removal and Resignation of the Guarantee Trustee..................  10


                                   ARTICLE V

                                   Guarantee

Section 5.1. Guarantee......................................................................  11
</TABLE> 
                                     -ii-
<PAGE>
 
<TABLE> 
                                                                                            Page
<S>                                                                                         <C>   
Section 5.2. Waiver of Notice and Demand....................................................  11
Section 5.3. Obligations Not Affected.......................................................  11
Section 5.4. Rights of Holders..............................................................  12
Section 5.5. Guarantee of Payment...........................................................  12
Section 5.6. Subrogation....................................................................  12
Section 5.7. Independent Obligations........................................................  13

                                  ARTICLE VI

                          Covenants and Subordination

Section 6.1. Subordination..................................................................  13
Section 6.2. Pari Passu Guarantees..........................................................  13


                                  ARTICLE VII

                                  Termination

Section 7.1. Termination....................................................................  13


                                 ARTICLE VIII

                                 Miscellaneous

Section 8.1. Successors and Assigns.........................................................  14
Section 8.2. Amendments.....................................................................  14
Section 8.3. Notices........................................................................  14
Section 8.4. Benefit........................................................................  15
Section 8.5. Governing Law..................................................................  15
Section 8.6. Counterparts...................................................................  15
</TABLE>

                                     -iii-
<PAGE>
 
     GUARANTEE AGREEMENT, dated as of January __, 1997, between NORTHERN TRUST
CORPORATION, a Delaware corporation (the "Guarantor"), having its principal
office at Fifty South LaSalle Street, Chicago, Illinois 60675, and THE FIRST
NATIONAL BANK OF CHICAGO, a national banking association, as trustee (the
"Guarantee Trustee"), for the benefit of the Holders (as defined herein) from
time to time of the Preferred Securities (as defined herein) of NTC CAPITAL I, a
Delaware statutory business trust (the "Issuer Trust").

                          Recitals of the Corporation

     Whereas, pursuant to an Amended and Restated Trust Agreement, dated as of
January __, 1997 (the "Trust Agreement"), among Northern Trust Corporation, as
Depositor, the Property Trustee, the Delaware Trustee and the Administrative
Trustees named therein, the Issuer Trust is issuing $150,000,000 aggregate
Liquidation Amount (as defined in the Trust Agreement) of its [   ]% Preferred
Securities, Series A (liquidation amount $25 per Preferred Security) (the
"Preferred Securities"), representing preferred undivided beneficial interests
in the assets of the Issuer Trust and having the terms set forth in the Trust
Agreement; and

     Whereas, the Preferred Securities will be issued by the Issuer Trust and
the proceeds thereof, together with the proceeds from the issuance of the Issuer
Trust's Common Securities (as defined herein), will be used to purchase the
Debentures (as defined in the Trust Agreement) of the Guarantor, which
Debentures will be deposited with The First National Bank of Chicago, as
Property Trustee under the Trust Agreement, as trust assets; and

     Whereas, as an incentive for the Holders to purchase Preferred Securities,
the Guarantor desires irrevocably and unconditionally to agree, to the extent
set forth herein, to pay to the Holders of the Preferred Securities the
Guarantee Payments (as defined herein) and to make certain other payments on the
terms and conditions set forth herein.

     Now, Therefore, in consideration of the purchase of Preferred Securities by
each Holder, which purchase the Guarantor hereby acknowledges shall benefit the
Guarantor, the Guarantor executes and delivers this Guarantee Agreement for the
benefit of the Holders from time to time.


                                   ARTICLE I

                                  Definitions

     Section 1.1. Definitions.

          For all purposes of this Guarantee Agreement, except as otherwise
expressly provided or unless the context otherwise requires:

     (a) The terms defined in this Article have the meanings assigned to them in
this Article, and include the plural as well as the singular;

     (b) All other terms used herein that are defined in the Trust Indenture
Act, either directly or by reference therein, have the meanings assigned to them
therein;
<PAGE>
 
     (c) The words "include", "includes" and "including" shall be deemed to be
followed by the phrase "without limitation";

     (d) All accounting terms used but not defined herein have the meanings
assigned to them in accordance with United States generally accepted accounting
principles;

     (e) Unless the context otherwise requires, any reference to an "Article" or
a "Section" refers to an Article or a Section, as the case may be, of this
Guarantee Agreement; and

     (f) The words "hereby", "herein", "hereof" and "hereunder" and other words
of similar import refer to this Guarantee Agreement as a whole and not to any
particular Article, Section or other subdivision.

     "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person. For the purposes of this definition,
"control", when used with respect to any specified Person, means the power to
direct the management and policies of such Person, directly or indirectly,
whether through the ownership of voting securities, by contract or otherwise;
and the terms "controlling" and "controlled" have meanings correlative to the
foregoing.

     "Board of Directors" means the board of directors of the Guarantor or the
Executive Committee of the board of directors of the Guarantor (or any other
committee of the board of directors of the Guarantor performing similar
functions) or a committee designated by the board of directors of the Guarantor
(or such committee), comprised of two or more members of the board of directors
of the Guarantor or officers of the Guarantor, or both.

     "Common Securities" means the securities representing common undivided
beneficial interests in the assets of the Issuer Trust.

     "Event of Default" means (i) a default by the Guarantor in any of its
payment obligations under this Guarantee Agreement or (ii) a default by the
Guarantor in any other obligation hereunder that remains unremedied for 30 days.

     "Guarantee Agreement" means this Guarantee Agreement, as modified, amended
or supplemented from time to time.

     "Guarantee Payments" means the following payments or distributions, without
duplication, with respect to the Preferred Securities, to the extent not paid or
made by or on behalf of the Issuer Trust: (i) any accumulated and unpaid
Distributions (as defined in the Trust Agreement) required to be paid on the
Preferred Securities, to the extent the Issuer Trust shall have funds on hand
available therefor at such time; (ii) the Redemption Price (as defined in the
Trust Agreement) with respect to any Preferred Securities called for redemption
by the Issuer Trust, to the extent the Issuer Trust shall have funds on hand
available therefor at such time; and (iii) upon a voluntary or involuntary
termination, winding-up or liquidation of the Issuer Trust, unless Debentures
are distributed to the Holders, the lesser of (a) the Liquidation Distribution
(as defined in the Trust Agreement) with respect to the Preferred Securities, to
the extent that the Issuer Trust shall have funds on hand available therefor at
such time, and (b) the amount of assets of the Issuer Trust remaining available

                                      -2-
<PAGE>
 
for distribution to Holders on liquidation of the Issuer.

     "Guarantee Trustee" means The First National Bank of Chicago, solely in its
capacity as Guarantee Trustee and not in its individual capacity, until a
Successor Guarantee Trustee has been appointed and has accepted such appointment
pursuant to the terms of this Guarantee Agreement, and thereafter means each
such Successor Guarantee Trustee.

     "Guarantor" has the meaning specified in the first paragraph of this
Guarantee Agreement.

     "Holder" means any Holder (as defined in the Trust Agreement) of any
Preferred Securities; provided, however, that in determining whether the holders
of the requisite percentage of Preferred Securities have given any request,
notice, consent or waiver hereunder, "Holder" shall not include the Guarantor,
the Guarantee Trustee, or any Affiliate of the Guarantor or the Guarantee
Trustee.

     "Indenture" means the Junior Subordinated Indenture, dated as of January
__, 1997 between Northern Trust Corporation and The First National Bank of
Chicago, as trustee, as the same may be modified, amended or supplemented from
time to time.

     "Issuer Trust" has the meaning specified in the first paragraph of this
Guarantee Agreement.

     "List of Holders" has the meaning specified in Section 2.2(a).

     "Majority in Liquidation Amount of the Preferred Securities" means, except
as provided by the Trust Indenture Act, Preferred Securities representing more
than 50% of the aggregate Liquidation Amount (as defined in the Trust Agreement)
of all Preferred Securities then Outstanding (as defined in the Trust
Agreement).

     "Officers' Certificate" means, with respect to the Guarantor, a certificate
signed by the Chairman or a Vice Chairman of the Board of Directors of the
Guarantor or the President or a Vice President of the Guarantor, and by the
Treasurer, an Assistant Treasurer, the Secretary or an Assistant Secretary of
the Guarantor, and delivered to the Guarantee Trustee. Any Officers' Certificate
delivered with respect to compliance with a condition or covenant provided for
in this Guarantee Agreement shall include:

     (a) a statement by each officer signing the Officers' Certificate that such
officer has read the covenant or condition and the definitions relating thereto;

     (b) a brief statement of the nature and scope of the examination or
investigation undertaken by such officer in rendering the Officers' Certificate;

     (c) a statement that such officer has made such examination or
investigation as, in such officer's opinion, is necessary to enable such officer
to express an informed opinion as to whether or not such covenant or condition
has been complied with; and

     (d) a statement as to whether, in the opinion of such officer, such
condition or covenant has been complied with.

                                      -3-
<PAGE>
 
     "Person" means a legal person, including any individual, corporation,
estate, partnership, joint venture, association, joint-stock company, company,
limited liability company, trust, business trust, unincorporated association, or
government or any agency or political subdivision thereof, or any other entity
of whatever nature.

     "Preferred Securities" has the meaning specified in the recitals to this
Guarantee Agreement.

     "Responsible Officer" means, with respect to the Guarantee Trustee, any
Senior Vice President, any Vice President, any Assistant Vice President, the
Secretary, any Assistant Secretary, the Treasurer, any Assistant Treasurer, any
Trust Officer or Assistant Trust Officer or any other officer of the Corporate
Trust Department of the Guarantee Trustee and also means, with respect to a
particular matter, any other officer to whom such matter is referred because of
that officer's knowledge of and familiarity with the particular subject.

     "Successor Guarantee Trustee" means a successor Guarantee Trustee
possessing the qualifications to act as Guarantee Trustee under Section 4.1.

     "Trust Agreement" means the Amended and Restated Trust Agreement of the
Issuer Trust referred to in the recitals to this Guarantee Agreement, as
modified, amended or supplemented from time to time.

     "Trust Indenture Act" means the Trust Indenture Act of 1939 as in force at
the date as of which this Guarantee Agreement was executed; provided, however,
that in the event the Trust Indenture Act of 1939 is amended after such date,
"Trust Indenture Act" means, to the extent required by any such amendment, the
Trust Indenture Act of 1939 as so amended.

     "Vice President", when used with respect to the Corporation, means any duly
appointed vice president, whether or not designated by a number or a word or
words added before or after the title "vice president."


                                  ARTICLE II

                              Trust Indenture Act

     Section 2.1. Trust Indenture Act; Application.

     (a) This Guarantee Agreement is subject to the provisions of the Trust
Indenture Act that are required to be part of this Guarantee Agreement and
shall, to the extent applicable, be governed by such provisions.

     (b) If and to the extent that any provision of this Guarantee Agreement
limits, qualifies or conflicts with the duties imposed by Section 310 and 317,
inclusive, of the Trust Indenture Act through operation of Section 318(c)
thereof, such imposed duties shall control. If any provision of this Guarantee
Agreement modifies or excludes any provision of the Trust Indenture Act which
may be so modified or excluded, the latter provision shall be deemed to apply to
this Guarantee Agreement as so modified or to be excluded, as the case may be.

                                      -4-
<PAGE>
 
     Section 2.2. List of Holders.

     (a) The Guarantor shall furnish or cause to be furnished to the Guarantee
Trustee (a) semiannually, on or before June 30 and December 31 of each year, a
list, in such form as the Guarantee Trustee may reasonably require, of the names
and addresses of the Holders (a "List of Holders") as of a date not more than 15
days prior to the delivery thereof, and (b) at such other times as the Guarantee
Trustee may request in writing, within 30 days after the receipt by the
Guarantor of any such request, a List of Holders as of a date not more than 15
days prior to the time such list is furnished, in each case to the extent such
information is in the possession or control of the Guarantor and has not
otherwise been received by the Guarantee Trustee in its capacity as such. The
Guarantee Trustee may destroy any List of Holders previously given to it on
receipt of a new List of Holders.

     (b) The Guarantee Trustee shall comply with the requirements of Section
311(a), Section 311(b) and Section 312(b) of the Trust Indenture Act.

     Section 2.3. Reports by the Guarantee Trustee.

     Not later than July 15 of each year, commencing July 15, 1997, the
Guarantee Trustee shall provide to the Holders such reports as are required by
Section 313 of the Trust Indenture Act, if any, in the form and in the manner
provided by Section 313 of the Trust Indenture Act. The Guarantee Trustee shall
also comply with the requirements of Section 313(d) of the Trust Indenture Act.

     Section 2.4. Periodic Reports to the Guarantee Trustee.

     The Guarantor shall provide to the Guarantee Trustee, the Securities and
Exchange Commission and the Holders such documents, reports and information, if
any, as required by Section 314 of the Trust Indenture Act and the compliance
certificate required by Section 314 of the Trust Indenture Act, in the form, in
the manner and at the times required by Section 314 of the Trust Indenture Act.

     Section 2.5. Evidence of Compliance with Conditions Precedent.

     The Guarantor shall provide to the Guarantee Trustee such evidence of
compliance with such conditions precedent, if any, provided for in this
Guarantee Agreement that relate to any of the matters set forth in Section
314(c) of the Trust Indenture Act. Any certificate or opinion required to be
given by an officer of the Guarantor pursuant to Section 314(c)(1) may be given
in the form of an Officers' Certificate.

     Section 2.6. Events of Default; Waiver.

     The Holders of at least a Majority in Liquidation Amount of the Preferred
Securities may, by vote, on behalf of the Holders of all the Preferred
Securities, waive any past default or Event of Default and its consequences.
Upon such waiver, any such default or Event of Default shall cease to exist, and
any default or Event of Default arising therefrom shall be deemed to have been
cured, for every purpose of this Guarantee Agreement, but no such waiver shall
extend to any subsequent or other default or Event of Default or impair any
right consequent thereon.

                                      -5-
<PAGE>
 
     Section 2.7. Event of Default; Notice.

     (a) The Guarantee Trustee shall, within 90 days after the occurrence of an
Event of Default, transmit by mail, first class postage prepaid, to the Holders,
notice of any such Event of Default known to the Guarantee Trustee, unless such
Event of Default has been cured before the giving of such notice, provided that,
except in the case of a default in the payment of a Guarantee Payment, the
Guarantee Trustee shall be protected in withholding such notice if and so long
as the board of directors, the executive committee or a trust committee of
directors and/or Responsible Officers of the Guarantee Trustee in good faith
determines that the withholding of such notice is in the interests of the
Holders.

     (b) The Guarantee Trustee shall not be deemed to have knowledge of any
Event of Default unless the Guarantee Trustee shall have received written
notice, or a Responsible Officer charged with the administration of this
Guarantee Agreement shall have obtained actual knowledge, of such Event of
Default.

     Section 2.8. Conflicting Interests.

     The Trust Agreement and the Indenture shall be deemed to be specifically
described in this Guarantee Agreement for the purposes of clause (i) of the
first proviso contained in Section 310(b) of the Trust Indenture Act.


                                  ARTICLE III

              Powers, Duties and Rights of the Guarantee Trustee

     Section 3.1. Powers and Duties of the Guarantee Trustee.

     (a) This Guarantee Agreement shall be held by the Guarantee Trustee for the
benefit of the Holders, and the Guarantee Trustee shall not transfer this
Guarantee Agreement to any Person except to a Successor Guarantee Trustee on
acceptance by such Successor Guarantee Trustee of its appointment to act as
Guarantee Trustee hereunder. The right, title and interest of the Guarantee
Trustee, as such, hereunder shall automatically vest in any Successor Guarantee
Trustee, upon acceptance by such Successor Guarantee Trustee of its appointment
hereunder, and such vesting and cessation of title shall be effective whether or
not conveyancing documents have been executed and delivered pursuant to the
appointment of such Successor Guarantee Trustee.

     (b) If an Event of Default has occurred and is continuing, the Guarantee
Trustee shall enforce this Guarantee Agreement for the benefit of the Holders.

     (c) The Guarantee Trustee, before the occurrence of any Event of Default
and after the curing of all Events of Default that may have occurred, shall
undertake to perform only such duties as are specifically set forth in this
Guarantee Agreement, and no implied covenants shall be read into this Guarantee
Agreement against the Guarantee Trustee. If an Event of Default has occurred and
is continuing, the Guarantee Trustee shall exercise such of the rights and
powers vested in it by this Guarantee Agreement, and use the same degree of care
and skill in its exercise thereof, as a prudent 

                                      -6-
<PAGE>
 
person would exercise or use under the circumstances in the conduct of his or
her own affairs.

     (d) No provision of this Guarantee Agreement shall be construed to relieve
the Guarantee Trustee from liability for its own negligent action, its own
negligent failure to act or its own wilful misconduct, except that:

          (i)    Prior to the occurrence of any Event of Default and after the
     curing or waiving of all such Events of Default that may have occurred:

               (A) the duties and obligations of the Guarantee Trustee shall be
          determined solely by the express provisions of this Guarantee
          Agreement (including pursuant to Section 2.1), and the Guarantee
          Trustee shall not be liable except for the performance of such duties
          and obligations as are specifically set forth in this Guarantee
          Agreement; and

               (B) in the absence of bad faith on the part of the Guarantee
          Trustee, the Guarantee Trustee may conclusively rely, as to the truth
          of the statements and the correctness of the opinions expressed
          therein, upon any certificates or opinions furnished to the Guarantee
          Trustee and conforming to the requirements of this Guarantee
          Agreement; but in the case of any such certificates or opinions that
          by any provision hereof or of the Trust Indenture Act are specifically
          required to be furnished to the Guarantee Trustee, the Guarantee
          Trustee shall be under a duty to examine the same to determine whether
          or not they conform to the requirements of this Guarantee Agreement.

          (ii)   The Guarantee Trustee shall not be liable for any error of
     judgment made in good faith by a Responsible Officer of the Guarantee
     Trustee, unless it shall be proved that the Guarantee Trustee was negligent
     in ascertaining the pertinent facts upon which such judgment was made.

          (iii)  The Guarantee Trustee shall not be liable with respect to any
     action taken or omitted to be taken by it in good faith in accordance with
     the direction of the Holders of not less than a Majority in Liquidation
     Amount of the Preferred Securities relating to the time, method and place
     of conducting any proceeding for any remedy available to the Guarantee
     Trustee, or exercising any trust or power conferred upon the Guarantee
     Trustee under this Guarantee Agreement.

          (iv)   No provision of this Guarantee Agreement shall require the
     Guarantee Trustee to expend or risk its own funds or otherwise incur
     personal financial liability in the performance of any of its duties or in
     the exercise of any of its rights or powers, if the Guarantee Trustee shall
     have reasonable grounds for believing that the repayment of such funds or
     liability is not reasonably assured to it under the terms of this Guarantee
     Agreement or adequate indemnity against such risk or liability is not
     reasonably assured to it.

                                      -7-
<PAGE>
 
     Section 3.2. Certain Rights of Guarantee Trustee.

     (a) Subject to the provisions of Section 3.1:

          (i)    The Guarantee Trustee may rely and shall be fully protected in
     acting or refraining from acting upon any resolution, certificate,
     statement, instrument, opinion, report, notice, request, direction,
     consent, order, bond, debenture, note, other evidence of indebtedness or
     other paper or document reasonably believed by it to be genuine and to have
     been signed, sent or presented by the proper party or parties.

          (ii)   Any direction or act of the Guarantor contemplated by this
     Guarantee Agreement shall be sufficiently evidenced by an Officers'
     Certificate unless otherwise prescribed herein.

          (iii)  Whenever, in the administration of this Guarantee Agreement,
     the Guarantee Trustee shall deem it desirable that a matter be proved or
     established before taking, suffering or omitting to take any action
     hereunder, the Guarantee Trustee (unless other evidence is herein
     specifically prescribed) may, in the absence of bad faith on its part,
     request and rely upon an Officers' Certificate which, upon receipt of such
     request from the Guarantee Trustee, shall be promptly delivered by the
     Guarantor.

          (iv)   The Guarantee Trustee may consult with legal counsel, and the
     written advice or opinion of such legal counsel with respect to legal
     matters shall be full and complete authorization and protection in respect
     of any action taken, suffered or omitted to be taken by it hereunder in
     good faith and in accordance with such advice or opinion. Such legal
     counsel may be legal counsel to the Guarantor or any of its Affiliates and
     may be one of its employees. The Guarantee Trustee shall have the right at
     any time to seek instructions concerning the administration of this
     Guarantee Agreement from any court of competent jurisdiction.

          (v)    The Guarantee Trustee shall be under no obligation to exercise
     any of the rights or powers vested in it by this Guarantee Agreement at the
     request or direction of any Holder unless such Holder shall have provided
     to the Guarantee Trustee such adequate security and indemnity as would
     satisfy a reasonable person in the position of the Guarantee Trustee
     against the costs, expenses (including attorneys' fees and expenses) and
     liabilities that might be incurred by it in complying with such request or
     direction, including such reasonable advances as may be requested by the
     Guarantee Trustee; provided that nothing contained in this Section
     3.2(a)(v) shall be taken to relieve the Guarantee Trustee, upon the
     occurrence of an Event of Default, of its obligation to exercise the rights
     and powers vested in it by this Guarantee Agreement.

          (vi)   The Guarantee Trustee shall not be bound to make any
     investigation into the facts or matters stated in any resolution,
     certificate, statement, instrument, opinion, report, notice, request,
     direction, consent, order, bond, debenture, note, other evidence of
     indebtedness or other paper or document, but the Guarantee Trustee, in its
     discretion, may make such further inquiry or investigation into such facts
     or matters as it may see fit.

          (vii)  The Guarantee Trustee may execute any of the trusts or powers
     hereunder or 

                                      -8-
<PAGE>
 
     perform any duties hereunder either directly or by or through its agents or
     attorneys, and the Guarantee Trustee shall not be responsible for any
     misconduct or negligence on the part of any such agent or attorney
     appointed by it with due care hereunder.

          (viii) Whenever in the administration of this Guarantee Agreement the
     Guarantee Trustee shall deem it desirable to receive instructions with
     respect to enforcing any remedy or right or taking any other action
     hereunder, the Guarantee Trustee (A) may request instructions from the
     Holders, (B) may refrain from enforcing such remedy or right or taking such
     other action until such instructions are received, and (C) shall be
     protected in acting in accordance with such instructions.

     (b) No provision of this Guarantee Agreement shall be deemed to impose any
duty or obligation on the Guarantee Trustee to perform any act or acts or
exercise any right, power, duty or obligation conferred or imposed on it in any
jurisdiction in which it shall be illegal, or in which the Guarantee Trustee
shall be unqualified or incompetent in accordance with applicable law, to
perform any such act or acts or to exercise any such right, power, duty or
obligation. No permissive power or authority available to the Guarantee Trustee
shall be construed to be a duty to act in accordance with such power and
authority.

     Section 3.3. Compensation; Indemnity; Fees.

     The Guarantor agrees:

          (a)  to pay to the Guarantee Trustee from time to time such reasonable
     compensation for all services rendered by it hereunder as may be agreed by
     the Guarantor and the Guarantee Trustee from time to time (which
     compensation shall not be limited by any provision of law in regard to the
     compensation of a trustee of an express trust);

          (b) except as otherwise expressly provided herein, to reimburse the
     Guarantee Trustee upon request for all reasonable expenses, disbursements
     and advances incurred or made by the Guarantee Trustee in accordance with
     any provision of this Guarantee Agreement (including the reasonable
     compensation and the expenses and disbursements of its agents and counsel),
     except any such expense, disbursement or advance as may be attributable to
     its negligence or bad faith; and

          (c) to indemnify the Guarantee Trustee for, and to hold it harmless
     against, any loss, liability or expense incurred without negligence, wilful
     misconduct or bad faith on the part of the Guarantee Trustee, arising out
     of or in connection with the acceptance or administration of this Guarantee
     Agreement, including the costs and expenses of defending itself against any
     claim or liability in connection with the exercise or performance of any of
     its powers or duties hereunder.

The Guarantee Trustee will not claim or exact any lien or charge on any
Guarantee Payments as a result of any amount due to it under this Guarantee
Agreement.

                                      -9-
<PAGE>
 
                                  ARTICLE IV

                               Guarantee Trustee

     Section 4.1. Guarantee Trustee; Eligibility.

     (a) There shall at all times be a Guarantee Trustee which shall:

          (i)  not be an Affiliate of the Guarantor; and

          (ii) be a Person that is eligible pursuant to the Trust Indenture Act
     to act as such and has a combined capital and surplus of at least
     $50,000,000, and shall be a corporation meeting the requirements of Section
     310(a) of the Trust Indenture Act. If such corporation publishes reports of
     condition at least annually, pursuant to law or to the requirements of its
     supervising or examining authority, then, for the purposes of this Section
     4.1 and to the extent permitted by the Trust Indenture Act, the combined
     capital and surplus of such corporation shall be deemed to be its combined
     capital and surplus as set forth in its most recent report of condition so
     published.

     (b) If at any time the Guarantee Trustee shall cease to be eligible to so
act under Section 4.1(a), the Guarantee Trustee shall immediately resign in the
manner and with the effect set out in Section 4.2.

     (c) If the Guarantee Trustee has or shall acquire any "conflicting
interest" within the meaning of Section 310(b) of the Trust Indenture Act, the
Guarantee Trustee and Guarantor shall in all respects comply with the provisions
of Section 310(b) of the Trust Indenture Act.

     Section 4.2. Appointment, Removal and Resignation of the Guarantee
Trustee.

     (a) Subject to Section 4.2(b), the Guarantee Trustee may be appointed or
removed without cause at any time by the Guarantor.

     (b) The Guarantee Trustee shall not be removed until a Successor Guarantee
Trustee has been appointed and has accepted such appointment by written
instrument executed by such Successor Guarantee Trustee and delivered to the
Guarantor.

     (c) The Guarantee Trustee appointed hereunder shall hold office until a
Successor Guarantee Trustee shall have been appointed or until its removal or
resignation. The Guarantee Trustee may resign from office (without need for
prior or subsequent accounting) by an instrument in writing executed by the
Guarantee Trustee and delivered to the Guarantor, which resignation shall not
take effect until a Successor Guarantee Trustee has been appointed and has
accepted such appointment by instrument in writing executed by such Successor
Guarantee Trustee and delivered to the Guarantor and the resigning Guarantee
Trustee.

     (d) If no Successor Guarantee Trustee shall have been appointed and
accepted appointment as provided in this Section 4.2 within 60 days after
delivery to the Guarantor of an instrument of resignation, the resigning
Guarantee Trustee may petition, at the expense of the Guarantor, any court 

                                      -10-
<PAGE>
 
of competent jurisdiction for appointment of a Successor Guarantee Trustee. Such
court may thereupon, after prescribing such notice, if any, as it may deem
proper, appoint a Successor Guarantee Trustee.


                                   ARTICLE V

                                   Guarantee

     Section 5.1. Guarantee.

     The Guarantor irrevocably and unconditionally agrees to pay in full to the
Holders the Guarantee Payments (without duplication of amounts theretofore paid
by or on behalf of the Issuer Trust), as and when due, regardless of any
defense, right of set-off or counterclaim that the Issuer Trust may have or
assert, except the defense of payment. The Guarantor's obligation to make a
Guarantee Payment may be satisfied by direct payment of the required amounts by
the Guarantor to the Holders or by causing the Issuer Trust to pay such amounts
to the Holders.

     Section 5.2. Waiver of Notice and Demand.

     The Guarantor hereby waives notice of acceptance of this Guarantee
Agreement and of any liability to which it applies or may apply, presentment,
demand for payment, any right to require a proceeding first against the
Guarantee Trustee, the Issuer Trust or any other Person before proceeding
against the Guarantor, protest, notice of nonpayment, notice of dishonor, notice
of redemption and all other notices and demands.

     Section 5.3. Obligations Not Affected.

     The obligations, covenants, agreements and duties of the Guarantor under
this Guarantee Agreement shall in no way be affected or impaired by reason of
the happening from time to time of any of the following:

          (a) the release or waiver, by operation of law or otherwise, of the
     performance or observance by the Issuer Trust of any express or implied
     agreement, covenant, term or condition relating to the Preferred Securities
     to be performed or observed by the Issuer Trust;

          (b) the extension of time for the payment by the Issuer Trust of all
     or any portion of the Distributions (other than an extension of time for
     payment of Distributions that results from the extension of any interest
     payment period on the Debentures as provided in the Indenture), Redemption
     Price, Liquidation Distribution or any other sums payable under the terms
     of the Preferred Securities or the extension of time for the performance of
     any other obligation under, arising out of, or in connection with, the
     Preferred Securities;

          (c) any failure, omission, delay or lack of diligence on the part of
     the Holders to enforce, assert or exercise any right, privilege, power or
     remedy conferred on the Holders pursuant to the terms of the Preferred
     Securities, or any action on the part of the Issuer Trust granting
     indulgence or extension of any kind;

                                      -11-
<PAGE>
 
          (d) the voluntary or involuntary liquidation, dissolution,
     receivership, insolvency, bankruptcy, assignment for the benefit of
     creditors, reorganization, arrangement, composition or readjustment of debt
     of, or other similar proceedings affecting, the Issuer Trust or any of the
     assets of the Issuer Trust;

          (e) any invalidity of, or defect or deficiency in, the Preferred
     Securities;

          (f) the settlement or compromise of any obligation guaranteed hereby
     or hereby incurred; or

          (g) any other circumstance whatsoever that might otherwise constitute
     a legal or equitable discharge or defense of a guarantor (other than
     payment of the underlying obligation), it being the intent of this Section
     5.3 that the obligations of the Guarantor hereunder shall be absolute and
     unconditional under any and all circumstances.

There shall be no obligation of the Holders to give notice to, or obtain the
consent of, the Guarantor with respect to the happening of any of the foregoing.

     Section 5.4. Rights of Holders.

     The Guarantor expressly acknowledges that: (i) this Guarantee Agreement
will be deposited with the Guarantee Trustee to be held for the benefit of the
Holders; (ii) the Guarantee Trustee has the right to enforce this Guarantee
Agreement on behalf of the Holders; (iii) the Holders of a Majority in
Liquidation Amount of the Preferred Securities have the right to direct the
time, method and place of conducting any proceeding for any remedy available to
the Guarantee Trustee in respect of this Guarantee Agreement or exercising any
trust or power conferred upon the Guarantee Trustee under this Guarantee
Agreement; and (iv) any Holder may institute a legal proceeding directly against
the Guarantor to enforce its rights under this Guarantee Agreement without first
instituting a legal proceeding against the Guarantee Trustee, the Issuer Trust
or any other Person.

     Section 5.5. Guarantee of Payment.

     This Guarantee Agreement creates a guarantee of payment and not of
collection. This Guarantee Agreement will not be discharged except by payment of
the Guarantee Payments in full (without duplication of amounts theretofore paid
by the Issuer Trust) or upon the distribution of Debentures to Holders as
provided in the Trust Agreement.

     Section 5.6. Subrogation.

     The Guarantor shall be subrogated to all rights (if any) of the Holders
against the Issuer Trust in respect of any amounts paid to the Holders by the
Guarantor under this Guarantee Agreement; provided, however, that the Guarantor
shall not (except to the extent required by mandatory provisions of law) be
entitled to enforce or exercise any rights which it may acquire by way of
subrogation or any indemnity, reimbursement or other agreement, in all cases as
a result of payment under this Guarantee Agreement, if, at the time of any such
payment, any amounts are due and unpaid under this Guarantee Agreement. If any
amount shall be paid to the Guarantor in violation of the preceding sentence,
the Guarantor agrees to hold such amount in trust for the Holders and to pay

                                      -12-
<PAGE>
 
over such amount to the Holders.

     Section 5.7. Independent Obligations.

     The Guarantor acknowledges that its obligations hereunder are independent
of the obligations of the Issuer Trust with respect to the Preferred Securities
and that the Guarantor shall be liable as principal and as debtor hereunder to
make Guarantee Payments pursuant to the terms of this Guarantee Agreement
notwithstanding the occurrence of any event referred to in subsections (a)
through (g), inclusive, of Section 5.3 hereof.


                                  ARTICLE VI

                          Covenants and Subordination

     Section 6.1. Subordination.

     The obligations of the Guarantor under this Guarantee Agreement will
constitute unsecured obligations of the Guarantor and will rank subordinate and
junior in right of payment to all Senior Indebtedness (as defined in the
Indenture) of the Guarantor to the extent and in the manner set forth in the
Indenture with respect to the Debentures, and the provisions of Article XIII of
the Indenture will apply, mutatis mutandis, to the obligations of the Guarantor
hereunder. The obligations of the Guarantor hereunder do not constitute Senior
Indebtedness (as defined in the Indenture) of the Guarantor.

     Section 6.2. Pari Passu Guarantees.

     The obligations of the Guarantor under this Guarantee Agreement shall rank
pari passu with the obligations of the Guarantor under (i) any similar guarantee
agreements issued by the Guarantor on behalf of the holders of preferred or
capital securities issued by any Issuer Trust (as defined in the Indenture),
(ii) the Indenture and the Securities (as defined therein) issued thereunder;
(iii) the Expense Agreement (as defined in the Trust Agreement) and any similar
expense agreements entered into by the Guarantor in connection with the offering
of Preferred Securities (as defined in the Indenture) by any Issuer Trust (as
defined in the Indenture), and (iv) any other security, guarantee or other
agreement or obligation that is expressly stated to rank pari passu with the
obligations of the Guarantor under this Guarantee Agreement or with any
obligation that ranks pari passu with the obligations of the Guarantor under
this Guarantee Agreement.


                                  ARTICLE VII

                                  Termination

     Section 7.1. Termination.

     This Guarantee Agreement shall terminate and be of no further force and
effect upon (i) full payment of the Redemption Price (as defined in the Trust
Agreement) of all Preferred Securities, (ii) 

                                      -13-
<PAGE>
 
the distribution of Debentures to the Holders in exchange for all of the
Preferred Securities or (iii) full payment of the amounts payable in accordance
with Article IX of the Trust Agreement upon liquidation of the Issuer Trust.
Notwithstanding the foregoing, this Guarantee Agreement will continue to be
effective or will be reinstated, as the case may be, if at any time any Holder
is required to repay any sums paid with respect to Preferred Securities or this
Guarantee Agreement.


                                 ARTICLE VIII

                                 Miscellaneous

     Section 8.1. Successors and Assigns.

     All guarantees and agreements contained in this Guarantee Agreement shall
bind the successors, assigns, receivers, trustees and representatives of the
Guarantor and shall inure to the benefit of the Holders of the Preferred
Securities then outstanding. Except in connection with a consolidation, merger
or sale involving the Guarantor or a conveyance, transfer or lease of the
Guarantor's properties that is permitted under Article VIII of the Indenture and
pursuant to which the successor or assignee agrees in writing to perform the
Guarantor's obligations hereunder, the Guarantor shall not assign its
obligations hereunder, and any purported assignment other than in accordance
with this provision shall be void.

     Section 8.2. Amendments.

     Except with respect to any changes that do not adversely affect the rights
of the Holders in any material respect (in which case no consent of the Holders
will be required), this Guarantee Agreement may only be amended with the prior
approval of the Holders of not less than a Majority in Liquidation Amount of the
Preferred Securities. The provisions of Article VI of the Trust Agreement
concerning meetings of the Holders shall apply to the giving of such approval.

     Section 8.3. Notices.

     Any notice, request or other communication required or permitted to be
given hereunder shall be in writing, duly signed by the party giving such
notice, and delivered, telecopied or mailed by first class mail as follows:

     (a) if given to the Guarantor, to the address or telecopy number set forth
below or such other address or telecopy number as the Guarantor may give notice
to the Guarantee Trustee and the Holders:

          Northern Trust Corporation
          Fifty South LaSalle Street
          Chicago, Illinois 60675
          Attention: Secretary
          Telecopy: 312-630-1596

     (b) if given to the Guarantee Trustee, at the address or telecopy number
set forth below or 

                                      -14-
<PAGE>
 
such other address or telecopy number as the Guarantee Trustee may give notice
to the Guarantor and Holders:

          The First National Bank of Chicago
          One First National Bank Plaza, Suite 0126
          Chicago, Illinois 60670
          Attention:  Corporate Trust Administration
          Telecopy:  312-407-1708

     with a copy to:

          NTC Capital I
          c/o Northern Trust Corporation
          Fifty South LaSalle Street
          Chicago, Illinois 60675
          Attention: Secretary
          Telecopy: 312-630-1596


     (c) if given to any Holder, at the address set forth on the books and
records of the Issuer Trust.

     All notices hereunder shall be deemed to have been given when received in
person, telecopied with receipt confirmed, or mailed by first class mail,
postage prepaid, except that if a notice or other document is refused delivery
or cannot be delivered because of a changed address of which no notice was
given, such notice or other document shall be deemed to have been delivered on
the date of such refusal or inability to deliver.

     Section 8.4. Benefit.

     This Guarantee Agreement is solely for the benefit of the Holders and is
not separately transferable from the Preferred Securities.

     Section 8.5. Governing Law.

     This Guarantee Agreement shall be governed by and construed in accordance
with the laws of the State of Illinois.

     Section 8.6. Counterparts.

     This instrument may be executed in any number of counterparts, each of
which so executed shall be deemed to be an original, but all such counterparts
shall together constitute but one and the same instrument.

                                      -15-
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have executed this Guarantee
Agreement as of the day and year first above written.


                                    Northern Trust Corporation


                                    By:_________________________________________
                                       Name:
                                       Title:


                                    The First National Bank of Chicago,
                                    as Guarantee Trustee


                                    By:_________________________________________
                                       Name:
                                       Title:

                                      -16-
<PAGE>
 
State of          )     
                  ) ss.:
County of         )     


     On the _____ day of January, 1997, before me personally came
to me known, who, being by me duly sworn, did depose and say that he/she is
____________________________ of ________________, one of the corporations
described in and which executed the foregoing instrument; that he/she signed
his/her name thereto by authority of the Board of Directors of said corporation.



                                                   _____________________________



State of          )     
                  ) ss.:
County of         )     


     On the _____ day of January, 1997, before me personally came
_________________, to me known, who, being by me duly sworn, did depose and say
that he/she is a/an ____________________________ of ____________________ one of
the corporations described in and which executed the foregoing instrument by
authority of the Board of Directors of said corporation.



                                                    ____________________________

                                      -17-

<PAGE>
 
                     [LETTERHEAD OF SCHIFF HARDIN & WAITE]

                                                                    Exhibit 5(a)


Robert J. Minkus
(312) 258-5584


                                January 3, 1997



Northern Trust Corporation
50 South LaSalle Street
Chicago, Illinois 60675

Ladies and Gentlemen:

     We are acting as counsel to Northern Trust Corporation, a Delaware
corporation (the "Corporation"), and NTC Capital I, NTC Capital II and NTC
Capital III, each of which is a Delaware statutory business trust (each, a
"Trust"), in connection with their filing of a Registration Statement on Form S-
3 (the "Registration Statement") under the Securities Act of 1933, as amended
(the "Act"), relating to the registration of (i) up to $250,000,000 aggregate
principal amount of Junior Subordinated Deferrable Interest Debentures of the
Corporation (the "Debt Securities"), (ii) up to $250,000,000 aggregate
liquidation amount of Preferred Securities of the Trusts (the "Preferred
Securities") and (iii) the guarantees with respect to the Preferred Securities
(the "Guarantees") to be executed and delivered by the Corporation for the
benefit of the holders from time to time of the Preferred Securities, to be
issued from time to time pursuant to Rule 415 under the Act.

     As counsel to the Corporation and the Trusts, we have examined such
corporate records, certificates and other documents, and such matters of law, as
we deemed necessary or appropriate to enable us to render this opinion.

     On the basis of such examination, we are of the opinion that, when:

          (a) the Registration Statement, as it may be amended, has become
effective under the Act and any applicable state securities or Blue Sky laws
have been complied with;

          (b) the Indenture relating to the Debt Securities (the "Indenture")
has been executed and delivered;

          (c) the Guarantee Agreement relating to the Guarantees with respect to
the Preferred Securities of a Trust has been duly executed and delivered;
<PAGE>

Northern Trust Corporation
January 3, 1997
Page 2
 
          (d) the Amended and Restated Trust Agreement of such Trust has been
     duly executed and delivered;

          (e) the terms of the Debt Securities and of their issuance and sale
     have been established by the Corporation in conformity with the Indenture
     so as not to violate any applicable law or result in a default under or
     breach of any agreement or instrument binding upon the Corporation and so
     as to comply with any requirement or restriction imposed by any court of
     governmental body having jurisdiction over the Corporation;

          (f)  the terms of the Preferred Securities of such Trust and of their
     issuance and sale have been established in conformity with the Amended and
     Restated Trust Agreement of such Trust so as not to violate any applicable
     law or result in a default under or breach of any agreement or instrument
     binding upon such Trust and so as to comply with any requirement or
     restriction imposed by any court of governmental body having jurisdiction
     over such Trust;

          (g)  the Debt Securities have been duly executed and authenticated in
     accordance with the applicable provisions of the Indenture and issued and
     sold as contemplated in the Registration Statement; and

          (h)  the Preferred Securities have been duly executed and
     authenticated in accordance with the applicable provisions of the Amended
     and Restated Trust Agreement of such Trust and issued and sold as
     contemplated in the Registration Statement,

the Debt Securities and the Guarantee relating to the Preferred Securities of
such Trust will be valid and legally binding obligations of the Corporation,
enforceable in accordance with their terms and entitled to the benefits of the
Indenture, except to the extent enforceability may be limited by applicable
bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium or other
similar laws now or hereafter in effect relating to or affecting creditors'
rights generally and by general principles of equity (regardless of whether such
enforceability is considered in a proceeding in equity or at law).

     The foregoing opinion is limited to the Delaware General Corporation Law,
the federal laws of the United States and the laws of the State of Illinois, and
we express no opinion as to the laws of any other jurisdiction.
<PAGE>
Northern Trust Corporation
January 3, 1997
Page 3

 
     We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to the reference to this firm under the caption
"Validity of Securities" in the Prospectus and the related Prospectus
Supplement.

                                 Very truly yours,

                                 SCHIFF HARDIN & WAITE


                                 By: /s/Robert J. Minkus
                                     ---------------------    
                                     Robert J. Minkus

RJM/tmc

<PAGE>
 
                                                                    Exhibit 5(b)



                   [Letterhead of Richards, Layton & Finger]



                                January 3, 1997



NTC Capital I
c/o Northern Trust Corporation
Fifty South LaSalle Street
Chicago, IL 60675

   Re:  NTC Capital I
        -------------

Ladies and Gentlemen:

   We have acted as special Delaware counsel for Northern Trust Corporation, a
Delaware corporation (the "Company"), and NTC Capital I, a Delaware business
trust (the "Trust"), in connection with the matters set forth herein.  At your
request, this opinion is being furnished to you.

   For purposes of giving the opinions hereinafter set forth, our examination of
documents has been limited to the examination of originals or copies of the
following:
 
   (a) The Certificate of Trust of the Trust, dated as of December 27, 1996 (the
"Certificate"), as filed in the office of the Secretary of State of the State of
Delaware (the "Secretary of State") on December 27, 1996;

   (b) The Trust Agreement of the Trust, dated as of December 27, 1996, among
the Company, as Depositor, and the trustees of the Trust named therein;

<PAGE>

NTC Capital I
January 3, 1997
Page 2
 
     (c)  Amendment No. 1 to the Registration Statement (the "Registration
Statement") on Form S-3, including a preliminary prospectus (the "Prospectus")
and preliminary prospectus supplement (the "Prospectus Supplement"), relating to
the __% Cumulative Trust Preferred Capital Securities, Series A, of the Trust
representing preferred undivided beneficial interests in the assets of the Trust
(each, a "Preferred Security" and collectively, the "Preferred Securities"), as
proposed to be filed by the Company, the Trust and others as set forth therein
with the Securities and Exchange Commission on or about January 3, 1997;

     (d)  A form of Amended and Restated Trust Agreement of the Trust, to be
entered into among the Company, as Depositor, the trustees of the Trust named
therein, and the holders, from time to time, of undivided beneficial interests
in the assets of the Trust (including Exhibits A, C and E thereto) (the "Trust
Agreement"), attached as an exhibit to the Registration Statement; and

     (e)  A Certificate of Good Standing for the Trust, dated January 3, 1997,
obtained from the Secretary of State.

     Initially capitalized terms used herein and not otherwise defined are used
as defined in the Trust Agreement.

     For purposes of this opinion, we have not reviewed any documents other than
the documents listed in paragraphs (a) through (e) above. In particular, we have
not reviewed any document (other than the documents listed in paragraphs (a)
through (e) above) that is referred to in or incorporated by reference into the
documents reviewed by us. We have assumed that there exists no provision in any
document that we have not reviewed that is inconsistent with the opinions stated
herein. We have conducted no independent factual investigation of our own but
rather have relied solely upon the foregoing documents, the statements and
information set forth therein and the additional matters recited or assumed
herein, all of which we have assumed to be true, complete and accurate in all
material respects.

     With respect to all documents examined by us, we have assumed (i) the
authenticity of all documents submitted to us as authentic originals, (ii) the
conformity with the originals of all documents submitted to us as copies or
forms, and (iii) the genuineness of all signatures.

     For purposes of this opinion, we have assumed (i) that the Trust Agreement
constitutes the entire agreement among the parties thereto with respect to the
subject matter thereof, including with respect to the creation, operation and
termination of the Trust, and that the Trust Agreement and the Certificate are
in full force and effect and have not been amended, (ii) except to the extent
provided in paragraph 1 below, the due creation or due organization or due
formation, as the case may be, and valid existence in good standing of each
party to the


<PAGE>

NTC Capital I
January 3, 1997
Page 3

 
documents examined by us under the laws of the jurisdiction governing its
creation, organization or formation, (iii) the legal capacity of natural persons
who are parties to the documents examined by us, (iv) that each of the parties
to the documents examined by us has the power and authority to execute and
deliver, and to perform its obligations under, such documents, (v) the due
authorization, execution and delivery by all parties thereto of all documents
examined by us, (vi) the receipt by each Person to whom a Preferred Security is
to be issued by the Trust (collectively, the "Preferred Security Holders") of a
Preferred Securities Certificate for such Preferred Security and the payment for
the Preferred Security acquired by it, in accordance with the Trust Agreement
and the Registration Statement, and (vii) that the Preferred Securities are
issued and sold to the Preferred Security Holders in accordance with the Trust
Agreement and the Registration Statement.  We have not participated in the
preparation of the Registration Statement and assume no responsibility for its
contents.

     This opinion is limited to the laws of the State of Delaware (excluding the
securities laws of the State of Delaware), and we have not considered and
express no opinion on the laws of any other jurisdiction, including federal laws
and rules and regulations relating thereto.  Our opinions are rendered only with
respect to Delaware laws and rules, regulations and orders thereunder that are
currently in effect.

     Based upon the foregoing, and upon our examination of such questions of law
and statutes of the State of Delaware as we have considered necessary or
appropriate, and subject to the assumptions, qualifications, limitations and
exceptions set forth herein, we are of the opinion that:

     1.   The Trust has been duly created and is validly existing in good
standing as a business trust under the Delaware Business Trust Act.

     2.   The Preferred Securities will represent valid and, subject to the
qualifications set forth in paragraph 3 below, fully paid and nonassessable
undivided beneficial interests in the assets of the Trust.

     3.   The Preferred Security Holders, as beneficial owners of the Trust,
will be entitled to the same limitation of personal liability extended to
stockholders of private corporations for profit organized under the General
Corporation Law of the State of Delaware. We note that the Preferred Security
Holders may be obligated to make payments as set forth in the Trust Agreement.

     We consent to the filing of this opinion with the Securities and Exchange
Commission as an exhibit to the Registration Statement.  In addition, we hereby
consent to the use of our name under the heading "Validity of Securities" in the
Prospectus and the
<PAGE>

NTC Capital I
January 3, 1997
Page 4
 
Prospectus Supplement.  In giving the foregoing consents, we do not thereby
admit that we come within the category of Persons whose consent is required
under Section 7 of the Securities Act of 1933, as amended, or the rules and
regulations of the Securities and Exchange Commission thereunder.  Except as
stated above, without our prior written consent, this opinion may not be
furnished or quoted to, or relied upon by, any other Person for any purpose.

                                       Very truly yours,



                                       /s/ Richards, Layton & Finger



BJK/dgw

<PAGE>
 
                                                                    Exhibit 5(c)



                   [Letterhead of Richards, Layton & Finger]



                                January 3, 1997



NTC Capital II
c/o Northern Trust Corporation
Fifty South LaSalle Street
Chicago, IL 60675

   Re:  NTC Capital II
        --------------

Ladies and Gentlemen:

          We have acted as special Delaware counsel for Northern Trust
Corporation, a Delaware corporation (the "Company"), and NTC Capital II, a
Delaware business trust (the "Trust"), in connection with the matters set forth
herein. At your request, this opinion is being furnished to you.

          For purposes of giving the opinions hereinafter set forth, our
examination of documents has been limited to the examination of originals or
copies of the following:
 
          (a)  The Certificate of Trust of the Trust, dated as of December 27,
1996 (the "Certificate"), as filed in the office of the Secretary of State of
the State of Delaware (the "Secretary of State") on December 27, 1996;

          (b)  The Trust Agreement of the Trust, dated as of December 27, 1996,
among the Company, as Depositor, and the trustees of the Trust named therein;
<PAGE>
NTC Capital II
January 3, 1997
Page 2

 
          (c)  Amendment No. 1 to the Registration Statement (the "Registration
Statement") on Form S-3, including a preliminary prospectus (the "Prospectus"),
relating to the __% Preferred Securities of the Trust representing preferred
undivided beneficial interests in the assets of the Trust (each, a "Preferred
Security" and collectively, the "Preferred Securities"), as proposed to be filed
by the Company, the Trust and others as set forth therein with the Securities
and Exchange Commission on or about January 3, 1997;

          (d)  A form of Amended and Restated Trust Agreement of the Trust, to
be entered into among the Company, as Depositor, the trustees of the Trust named
therein, and the holders, from time to time, of undivided beneficial interests
in the assets of the Trust (including Exhibits A, C and E thereto) (the "Trust
Agreement"), attached as an exhibit to the Registration Statement; and

          (e)  A Certificate of Good Standing for the Trust, dated January 3,
1997, obtained from the Secretary of State.

          Initially capitalized terms used herein and not otherwise defined are
used as defined in the Trust Agreement.

          For purposes of this opinion, we have not reviewed any documents other
than the documents listed in paragraphs (a) through (e) above. In particular, we
have not reviewed any document (other than the documents listed in paragraphs
(a) through (e) above) that is referred to in or incorporated by reference into
the documents reviewed by us. We have assumed that there exists no provision in
any document that we have not reviewed that is inconsistent with the opinions
stated herein. We have conducted no independent factual investigation of our own
but rather have relied solely upon the foregoing documents, the statements and
information set forth therein and the additional matters recited or assumed
herein, all of which we have assumed to be true, complete and accurate in all
material respects.

          With respect to all documents examined by us, we have assumed (i) the
authenticity of all documents submitted to us as authentic originals, (ii) the
conformity with the originals of all documents submitted to us as copies or
forms, and (iii) the genuineness of all signatures.

          For purposes of this opinion, we have assumed (i) that the Trust
Agreement constitutes the entire agreement among the parties thereto with
respect to the subject matter thereof, including with respect to the creation,
operation and termination of the Trust, and that the Trust Agreement and the
Certificate are in full force and effect and have not been amended, (ii) except
to the extent provided in paragraph 1 below, the due creation
<PAGE>
NTC Capital II
January 3, 1997
Page 3
 
or due organization or due formation, as the case may be, and valid existence in
good standing of each party to the documents examined by us under the laws of
the jurisdiction governing its creation, organization or formation, (iii) the
legal capacity of natural persons who are parties to the documents examined by
us, (iv) that each of the parties to the documents examined by us has the power
and authority to execute and deliver, and to perform its obligations under, such
documents, (v) the due authorization, execution and delivery by all parties
thereto of all documents examined by us, (vi) the receipt by each Person to whom
a Preferred Security is to be issued by the Trust (collectively, the "Preferred
Security Holders") of a Preferred Securities Certificate for such Preferred
Security and the payment for the Preferred Security acquired by it, in
accordance with the Trust Agreement and the Registration Statement, and (vii)
that the Preferred Securities are issued and sold to the Preferred Security
Holders in accordance with the Trust Agreement and the Registration Statement.
We have not participated in the preparation of the Registration Statement and
assume no responsibility for its contents.

          This opinion is limited to the laws of the State of Delaware
(excluding the securities laws of the State of Delaware), and we have not
considered and express no opinion on the laws of any other jurisdiction,
including federal laws and rules and regulations relating thereto. Our opinions
are rendered only with respect to Delaware laws and rules, regulations and
orders thereunder that are currently in effect.

          Based upon the foregoing, and upon our examination of such questions
of law and statutes of the State of Delaware as we have considered necessary or
appropriate, and subject to the assumptions, qualifications, limitations and
exceptions set forth herein, we are of the opinion that:

          1.   The Trust has been duly created and is validly existing in good
standing as a business trust under the Delaware Business Trust Act.

          2.   The Preferred Securities will represent valid and, subject to the
qualifications set forth in paragraph 3 below, fully paid and nonassessable
undivided beneficial interests in the assets of the Trust.

          3.   The Preferred Security Holders, as beneficial owners of the
Trust, will be entitled to the same limitation of personal liability extended to
stockholders of private corporations for profit organized under the General
Corporation Law of the State of Delaware. We note that the Preferred Security
Holders may be obligated to make payments as set forth in the Trust Agreement.

          We consent to the filing of this opinion with the Securities and
Exchange Commission as an exhibit to the Registration Statement. In addition, we
hereby consent to
<PAGE>
NTC Capital II
January 3, 1997
Page 4

 
the use of our name under the heading "Validity of Securities" in the Prospectus
and the Prospectus Supplement.  In giving the foregoing consents, we do not
thereby admit that we come within the category of Persons whose consent is
required under Section 7 of the Securities Act of 1933, as amended, or the rules
and regulations of the Securities and Exchange Commission thereunder.  Except as
stated above, without our prior written consent, this opinion may not be
furnished or quoted to, or relied upon by, any other Person for any purpose.

                                       Very truly yours,



                                       /s/ Richards, Layton & Finger

BJK/dgw

<PAGE>
 
                                                                    Exhibit 5(d)




                   [Letterhead of Richards, Layton & Finger]



                                January 3, 1997



NTC Capital III
c/o Northern Trust Corporation
Fifty South LaSalle Street
Chicago, IL 60675

          Re:  NTC Capital III
               ---------------

Ladies and Gentlemen:

          We have acted as special Delaware counsel for Northern Trust
Corporation, a Delaware corporation (the "Company"), and NTC Capital III, a
Delaware business trust (the "Trust"), in connection with the matters set forth
herein. At your request, this opinion is being furnished to you.

          For purposes of giving the opinions hereinafter set forth, our
examination of documents has been limited to the examination of originals or
copies of the following:
 
          (a) The Certificate of Trust of the Trust, dated as of December 27,
1996 (the "Certificate"), as filed in the office of the Secretary of State of
the State of Delaware (the "Secretary of State") on December 27, 1996;

          (b) The Trust Agreement of the Trust, dated as of December 27, 1996,
among the Company, as Depositor, and the trustees of the Trust named therein;
<PAGE>


NTC Capital III
January 3, 1997
Page 2

 
          (c) Amendment No. 1 to the Registration Statement (the "Registration
Statement") on Form S-3, including a preliminary prospectus (the "Prospectus"),
relating to the __% Preferred Securities of the Trust representing preferred
undivided beneficial interests in the assets of the Trust (each, a "Preferred
Security" and collectively, the "Preferred Securities"), as proposed to be filed
by the Company, the Trust and others as set forth therein with the Securities
and Exchange Commission on or about January 3, 1997;

          (d) A form of Amended and Restated Trust Agreement of the Trust, to be
entered into among the Company, as Depositor, the trustees of the Trust named
therein, and the holders, from time to time, of undivided beneficial interests
in the assets of the Trust (including Exhibits A, C and E thereto) (the "Trust
Agreement"), attached as an exhibit to the Registration Statement; and

          (e) A Certificate of Good Standing for the Trust, dated January 3,
1997, obtained from the Secretary of State.

          Initially capitalized terms used herein and not otherwise defined are
used as defined in the Trust Agreement.

          For purposes of this opinion, we have not reviewed any documents other
than the documents listed in paragraphs (a) through (e) above. In particular, we
have not reviewed any document (other than the documents listed in paragraphs
(a) through (e) above) that is referred to in or incorporated by reference into
the documents reviewed by us. We have assumed that there exists no provision in
any document that we have not reviewed that is inconsistent with the opinions
stated herein. We have conducted no independent factual investigation of our own
but rather have relied solely upon the foregoing documents, the statements and
information set forth therein and the additional matters recited or assumed
herein, all of which we have assumed to be true, complete and accurate in all
material respects.

          With respect to all documents examined by us, we have assumed (i) the
authenticity of all documents submitted to us as authentic originals, (ii) the
conformity with the originals of all documents submitted to us as copies or
forms, and (iii) the genuineness of all signatures.

          For purposes of this opinion, we have assumed (i) that the Trust
Agreement constitutes the entire agreement among the parties thereto with
respect to the subject matter thereof, including with respect to the creation,
operation and termination of the Trust, and that the Trust Agreement and the
Certificate are in full force and effect and have not been amended, (ii) except
to the extent provided in paragraph 1 below, the due creation or due
organization or due formation, as the case may be, and valid existence in good


<PAGE>
NTC Capital III
January 3, 1997
Page 3
 
standing of each party to the documents examined by us under the laws of the
jurisdiction governing its creation, organization or formation, (iii) the legal
capacity of natural persons who are parties to the documents examined by us,
(iv) that each of the parties to the documents examined by us has the power and
authority to execute and deliver, and to perform its obligations under, such
documents, (v) the due authorization, execution and delivery by all parties
thereto of all documents examined by us, (vi) the receipt by each Person to whom
a Preferred Security is to be issued by the Trust (collectively, the "Preferred
Security Holders") of a Preferred Securities Certificate for such Preferred
Security and the payment for the Preferred Security acquired by it, in
accordance with the Trust Agreement and the Registration Statement, and (vii)
that the Preferred Securities are issued and sold to the Preferred Security
Holders in accordance with the Trust Agreement and the Registration Statement.
We have not participated in the preparation of the Registration Statement and
assume no responsibility for its contents.

          This opinion is limited to the laws of the State of Delaware
(excluding the securities laws of the State of Delaware), and we have not
considered and express no opinion on the laws of any other jurisdiction,
including federal laws and rules and regulations relating thereto. Our opinions
are rendered only with respect to Delaware laws and rules, regulations and
orders thereunder that are currently in effect.

          Based upon the foregoing, and upon our examination of such questions
of law and statutes of the State of Delaware as we have considered necessary or
appropriate, and subject to the assumptions, qualifications, limitations and
exceptions set forth herein, we are of the opinion that:

          1.   The Trust has been duly created and is validly existing in good
standing as a business trust under the Delaware Business Trust Act.

          2.   The Preferred Securities will represent valid and, subject to the
qualifications set forth in paragraph 3 below, fully paid and nonassessable
undivided beneficial interests in the assets of the Trust.

          3.   The Preferred Security Holders, as beneficial owners of the
Trust, will be entitled to the same limitation of personal liability extended to
stockholders of private corporations for profit organized under the General
Corporation Law of the State of Delaware. We note that the Preferred Security
Holders may be obligated to make payments as set forth in the Trust Agreement.

          We consent to the filing of this opinion with the Securities and
Exchange Commission as an exhibit to the Registration Statement. In addition, we
hereby consent to the use of our name under the heading "Validity of Securities"
in the Prospectus. In giving
<PAGE>
NTC Capital III
January 3, 1997
Page 4
 
the foregoing consents, we do not thereby admit that we come within the category
of Persons whose consent is required under Section 7 of the Securities Act of
1933, as amended, or the rules and regulations of the Securities and Exchange
Commission thereunder.  Except as stated above, without our prior written
consent, this opinion may not be furnished or quoted to, or relied upon by, any
other Person for any purpose.

                                       Very truly yours,



                                       /s/ Richards, Layton & Finger


BJK/dgw

<PAGE>
 
                                                                       Exhibit 8

                     [LETTERHEAD OF SCHIFF HARDIN & WAITE]

Robert J. Minkus
(312) 258-5584


                                January 3, 1997



Northern Trust Corporation
50 South LaSalle Street
Chicago, Illinois 60675

 Re: Northern Trust Corporation/NTC Capital I/NTC Capital II/NTC Capital III
     Registration Statement on Form S-3 (Registration No. 333-18951/-01/-02/-03)
     ---------------------------------------------------------------------------

Ladies and Gentlemen:

     As special tax counsel to NTC Capital I, NTC Capital II, NTC Capital III
(each a "Trust") and Northern Trust Corporation in connection with the issuance
of up to $250,000,000 of Preferred Securities of the Trusts (the "Securities"),
and assuming (i) the holder of the Common Securities of each Trust will have
"substantial assets" (other than the Common Securities) within the meaning of
Treasury Regulations Section 301.7701-2(d)(2) and (ii) the operative documents
for the Securities described in the Prospectus and the Prospectus Supplement to
which this opinion is filed as an exhibit (the "Registration Statement") will be
performed in accordance with the terms described therein, we hereby confirm to
you our opinion as set forth under the heading "Certain Federal Income Tax
Consequences" in the Prospectus Supplement, subject to the limitations set forth
therein.

     Our opinion is based on current provisions of the Internal Revenue Code of
1986, the Treasury Regulations promulgated thereunder, published pronouncements
of the Internal Revenue Service and case law, any of which may be changed at any
time with retroactive effect.  Any change in applicable laws or facts and
circumstances surrounding the offering of the Securities, or any inaccuracy in
the statements, facts, assumptions and representations on which we have relied,
may affect the continuing validity of the opinions set forth herein.  We assume
no responsibility to inform you of any such change or inaccuracy that may occur
or come to our attention.
<PAGE>
Northern Trust Corporation
January 3, 1997
Page 2
 
     We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and the reference to us under the heading "Certain
Federal Income Tax Consequences" in the Registration Statement.

                                       Very truly yours,

                                       SCHIFF HARDIN & WAITE



                                       By:   /s/ Robert J. Minkus
                                             --------------------
                                                 Robert J. Minkus

RJM/cjk

<PAGE>
 
                                                                      EXHIBIT 12

                           NORTHERN TRUST CORPORATION

               COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

                             (DOLLARS IN MILLIONS)
<TABLE>
<CAPTION> 
                                                                                    Nine Months
                                                                                       Ended
                                                                                   --------------
                                                  Year Ended December 31            September 30
                                         ----------------------------------------  --------------
                                          1991    1992    1993    1994     1995     1995    1996
                                         ------  ------  ------  ------  --------  ------  ------
<S>                                      <C>     <C>     <C>     <C>     <C>       <C>     <C>

INCLUDING INTEREST ON DEPOSITS
Fixed Charges
   Interest Expense (Including
     Interest on Deposits).............  $566.3  $411.6  $378.5  $514.1  $  746.4  $552.2  $573.2
   One-Third of All Rents..............    12.2    12.4    12.5    13.4      14.7    10.8    11.8
                                         ------  ------  ------  ------  --------  ------  ------
          Total Fixed Charges..........  $578.5  $424.0  $391.0  $527.5  $  761.1  $563.0  $585.0
                                         ======  ======  ======  ======  ========  ======  ======

Income
   Income Before Income Taxes..........  $163.6  $206.5  $234.0  $261.5  $  320.5  $233.7  $286.5
   Fixed Charges.......................   578.5   424.0   391.0   527.5     761.1   563.0   585.0
                                         ------  ------  ------  ------  --------  ------  ------ 
          Earnings, as Defined.........  $742.1  $630.5  $625.0  $789.0  $1,081.6  $796.7  $871.5
                                         ======  ======  ======  ======  ========  ======  ======

Ratio of Earnings to Fixed Charges.....   1.28X   1.49X   1.60X   1.50X     1.42X   1.42X   1.49X

EXCLUDING INTEREST ON DEPOSITS
Fixed Charges
   Interest Expense (Excluding
     Interest on Deposits).............  $175.9  $121.5  $143.1  $216.1  $  303.1  $218.8  $239.4
   One-Third of All Rents..............    12.2    12.4    12.5    13.4      14.7    10.8    11.8
                                         ------  ------  ------  ------  --------  ------  ------
          Total Fixed Charges..........  $188.1  $133.9  $155.6  $229.5  $  317.8  $229.6  $251.2
                                         ======  ======  ======  ======  ========  ======  ======

Income
   Income Before Income Taxes..........  $163.6  $206.5  $234.0  $261.5  $  320.5  $233.7  $286.5
   Fixed Charges.......................   188.1   133.9   155.6   229.5     317.8   229.6   251.2
                                         ------  ------  ------  ------  --------  ------  ------
          Earnings, as Defined.........  $351.7  $340.4  $389.6  $491.0  $  638.3  $463.3  $537.7
                                         ======  ======  ======  ======  ========  ======  ======

   Ratio of Earnings to Fixed Charges..   1.87X   2.54X   2.50X   2.14X     2.01X   2.02X   2.14X
</TABLE>
<PAGE>
 

                           NORTHERN TRUST CORPORATION

           COMPUTATION OF RATIO OF EARNINGS TO COMBINED FIXED CHARGES
                            AND PREFERRED DIVIDENDS
                             (DOLLARS IN MILLIONS)
<TABLE>
<CAPTION>

                                                                                                  Nine Months
                                                                                                     Ended
                                                       Year Ended December 31                    September 30
                                        ------------------------------------------------       -----------------
                                         1991      1992      1993      1994       1995          1995       1996
                                        -------   ------    ------    ------    --------       ------     ------
<S>                                     <C>       <C>       <C>       <C>       <C>            <C>        <C>
INCLUDING INTEREST ON DEPOSITS
Fixed Charges
   Interest Expense (Including Interest
    on Deposits)........................ $566.3   $411.6    $378.5    $514.1    $  746.4       $552.2     $573.2
   One-Third of All Rents...............   12.2     12.4      12.5      13.4        14.7         10.8       11.8
                                        -------   ------    ------    ------    --------       ------     ------
          Total Fixed Charges........... $578.5   $424.0    $391.0    $527.5    $  761.1       $563.0     $585.0
Preferred Dividends*....................    4.7      4.9       4.5       5.1         5.8          4.4        2.5
          Total Combined Fixed Charges  -------   ------    ------    ------    --------       ------     ------
           and Preferred Dividends...... $583.2   $428.9    $395.5    $532.6    $  766.9       $567.4     $587.5
                                        =======   ======    ======    ======    ========       ======     ======
Income
   Income Before Income Taxes........... $163.6   $206.5    $234.0    $261.5    $  320.5       $233.7     $286.5
   Fixed Charges........................  578.5    424.0     391.0     527.5       761.1        563.0      585.0
                                        -------   ------    ------    ------    --------       ------     ------
          Earnings, as Defined.......... $742.1   $630.5    $625.0    $789.0    $1,081.6       $796.7     $871.5
                                        =======   ======    ======    ======    ========       ======     ======

Ratio of Earnings to Combined Fixed
 Charges and Preferrred Dividends.......  1.27X    1.47X     1.58X     1.48X       1.41X        1.40X      1.48X

EXCLUDING INTEREST ON DEPOSITS
Fixed Charges
   Interest Expense (Excluding
    Interest on Deposits)............... $175.9   $121.5    $143.1    $216.1    $  303.1       $218.8     $239.4
   One-Third of All Rents...............   12.2     12.4      12.5      13.4        14.7         10.8       11.8
                                        -------   ------    ------    ------    --------       ------     ------
          Total Fixed Charges........... $188.1   $133.9    $155.6    $229.5    $  317.8       $229.6     $251.2
Preferred Dividends*....................    4.7      4.9       4.5       5.1         5.8          4.4        2.5
                                        -------   ------    ------    ------    --------       ------     ------
          Total Combined Fixed Charges
           and Preferred Dividends...... $192.8   $138.8    $160.1    $234.6    $  323.6       $234.0     $253.7
                                        =======   ======    ======    ======    ========       ======     ======
Income
   Income Before Income Taxes........... $163.6   $206.5    $234.0    $261.5    $  320.5       $233.7     $286.5
   Fixed Charges........................  188.1    133.9     155.6     229.5       317.8        229.6      251.2
                                        -------   ------    ------    ------    --------       ------     ------
          Earnings, as Defined.......... $351.7   $340.4    $389.6    $491.0    $  638.3       $463.3     $537.7
                                        =======   ======    ======    ======    ========       ======     ======
   Ratio of Earnings to Combined Fixed
    Charges and Preferred Dividends.....  1.82X    2.45X     2.43X     2.09X       1.97X        1.98X      2.12X
</TABLE>
*The preferred dividends have been adjusted to a pretax basis using the
Corporation's effective tax rate. The effective tax rates for the twelve months
ended December 31, 1991 through 1995 were 22.1%, 27.6%, 28.2%, 30.3%, and 31.4%,
respectively. The effective tax rates for the nine months ended September 30,
1995 and September 30, 1996 were 31.3% and 33.2%, respectively.

<PAGE>
 
                                                                   EXHIBIT 23(a)

                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
                   -----------------------------------------



As independent public accountants, we hereby consent to the incorporation by
reference in this registration statement of our report dated January 16, 1996,
included in Northern Trust Corporation's Form 10-K for the year ended December
31, 1995, and to all references to our Firm included in this registration
statement.



                                       ARTHUR ANDERSEN LLP


Chicago, Illinois,

January 3, 1997

<PAGE>
 
                                                                      Exhibit 24

                               POWER OF ATTORNEY


KNOW ALL MEN BY THESE PRESENTS, THAT I, WILLIAM D. SMITHBURG, hereby constitute
and appoint William A. Osborn, Barry G. Hastings, Perry R. Pero and Harry W.
Short, or any of them, my true and lawful attorneys and agents, with full power
of substitution and resubstitution, for him and in his name, place and stead, to
execute in my name and on my behalf, in all capacities as a Director of Northern
Trust Corporation (the "Corporation"), one or more Registration Statements and
any amendments thereto (including, without limitation, post-effective
amendments, including post-effective amendments under Rule 462(b) under the
Securities Act of 1933) to be filed with the Securities and Exchange Commission
in connection with the registration under the Securities Act of 1933, as
amended, of junior subordinated deferrable interest debentures to be issued by
the Corporation, trust preferred securities to be issued by a business trust or
similar entity created by the Corporation, and guarantees by the Corporation of
the payment obligations under such trust preferred securities in an aggregate
amount to be registered not in excess of $300,000,000.

            I hereby ratify and confirm all that said attorneys, or any of them,
have done or shall lawfully do by virtue of this Power of Attorney.
            WITNESS my hand this 26th day of December, 1996.

                                      /s/ William D. Smithburg
                                      -------------------------------------- 
                                      William D. Smithburg
 

  


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