NORTHERN TRUST CORP
8-K, 1997-01-22
STATE COMMERCIAL BANKS
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<PAGE>

 
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                   FORM 8-K

                                CURRENT REPORT

                    Pursuant to Section 13 or 15(d) of the
                        Securities Exchange Act of 1934


     Date of Report (Date of earliest event reported)          January 16, 1997
                                                           ---------------------

                          NORTHERN TRUST CORPORATION
- --------------------------------------------------------------------------------
            (Exact name of registrant as specified in its charter)


                                   Delaware
- --------------------------------------------------------------------------------
                (State or other jurisdiction of incorporation)



        0-5965                                         36-2723087         
- ----------------------------                 ---------------------------------
   (Commission File Number)                  (IRS Employer Identification No.)



    Fifty South LaSalle Street, Chicago, Illinois               60675
- --------------------------------------------------------------------------------
     (Address of principal executive offices)                 (Zip Code)



      Registrant's telephone number, including area code     (312) 630-6000 
                                                            ---------------- 

<PAGE>
 
Item 5.  Other Events

         1.  On January 16, 1997, NTC Capital I, a Delaware statutory business 
trust (the "Trust"), issued $150,000,000 face amount of its Floating Rate 
Capital Securities, Series A (the "Capital Securities"), which represent 
beneficial interests in the Trust, in a public offering registered under the 
Securities Act of 1933, as amended (Registration Statement No. 333-18951).  The 
sole asset of the Trust is $154,640,000 in aggregate principal amount of the 
Floating Rate Junior Subordinated Debentures, Series A, of the registrant.  In 
addition, pursuant to the Guarantee Agreement referred to below, the registrant 
has guaranteed the obligations of the Trust under the Capital Securities to the 
extent set forth in the Guarantee Agreement.

         2.  The information contained in the registrant's January 21, 1997 
press release, reporting on the registrant's earnings for the fourth quarter and
full year of 1996, a copy of which is filed as Exhibit 99 hereto, is 
incorporated herein by reference.

Item 7.  Financial Statements and Exhibits
<TABLE> 
<CAPTION> 
             <S>             <C> 

         (c) Exhibits:

             Exhibit 1       Underwriting Agreement, dated January 9, 1997, by
                             and between Northern Trust Corporation, NTC Capital
                             I, Goldman, Sachs & Co. and Salomon Brothers Inc,
                             as Representatives of the Underwriters.

             Exhibit 4(a)    Junior Subordinated Indenture, dated as of January
                             1, 1997, between Northern Trust Corporation and The
                             First National Bank of Chicago, as Debenture
                             Trustee.

             Exhibit 4(h)    Amended and Restated Trust Agreement of NTC Capital
                             I, dated as of January 16, 1997, among Northern
                             Trust Corporation, as Depositor, The First National
                             Bank of Chicago, as Property Trustee, First Chicago
                             Delaware Inc., as Delaware Trustee, and the
                             Administrative Trustees named therein.

             Exhibit 4(j)    Guarantee Agreement, dated as of January 16, 1997,
                             relating to NTC Capital I, by and between Northern
                             Trust Corporation, as Guarantor, and The First
                             National Bank of Chicago, as Guarantee Trustee.

             Exhibit 99      January 21, 1997 Press Release.

</TABLE> 
                                    -2-   
<PAGE>
 
                                  SIGNATURE 

      Pursuant to the requirements of the Securities Exchange Act of 1934, the 
registrant has duly caused this report to be signed on its behalf by the 
undersigned thereunto duly authorized.


                                       NORTHERN TRUST CORPORATION
                                       --------------------------
                                             (Registrant)


Dated:  January 22, 1997               By:  /s/ Perry R. Pero
                                            ---------------------
                                            Perry R. Pero 
                                            Senior Executive Vice President
                                            and Chief Financial Officer


                                      -3-
<PAGE>
 
<TABLE> 
<CAPTION> 

                                 EXHIBIT INDEX
                                 -------------


Number                        Description                            
- ------                        -----------                            
<S>             <C> 

Exhibit 1       Underwriting Agreement, dated January 9, 1997, by
                and between Northern Trust Corporation, NTC Capital
                I, Goldman, Sachs & Co. and Salomon Brothers Inc,
                as Representatives of the Underwriters.

Exhibit 4(a)    Junior Subordinated Indenture, dated as of January
                1, 1997, between Northern Trust Corporation and The
                First National Bank of Chicago, as Debenture
                Trustee.

Exhibit 4(h)    Amended and Restated Trust Agreement of NTC Capital 
                I, dated as of January 16, 1997, among Northern Trust 
                Corporation, as Depositor, The First National Bank of 
                Chicago, as Property Trustee, First Chicago Delaware 
                Inc., as Delaware Trustee, and the Administrative
                Trustees named therein.

Exhibit 4(j)    Guarantee Agreement, dated as of January 16, 1997,
                relating to NTC Capital I, by and between Northern
                Trust Corporation, as Guarantor, and The First
                National Bank of Chicago, as Guarantee Trustee.

Exhibit 99      January 21, 1997 Press Release.                           


</TABLE> 

                                      -4-

<PAGE>
 
                                                                [Conformed Copy]

                                 NTC CAPITAL I
                                NTC CAPITAL II
                                NTC CAPITAL III

                             Preferred Securities

                     fully and unconditionally guaranteed
                  to the extent set forth in the Guarantee by

                          NORTHERN TRUST CORPORATION

                            Underwriting Agreement



                                                                 January 9, 1997



Ladies and Gentlemen:

     From time to time, NTC Capital I, NTC Capital II or NTC Capital III, each a
statutory business trust created under the laws of the State of Delaware (each a
"Trust" and collectively, the "Trusts"), and Northern Trust Corporation, a
Delaware corporation (the "Guarantor"), as depositor of each Trust and as
Guarantor, propose to enter into one or more Pricing Agreements (each a "Pricing
Agreement") in the form of Annex I hereto, with such additions and deletions as
the parties thereto may determine, and, subject to the terms and conditions
stated herein and therein, which shall provide that the Trust identified in the
applicable Pricing Agreement (such Trust being the "Designated Trust" with
respect to such Pricing Agreement) shall issue and sell to the firms (such firms
constituting the "Underwriters" with respect to such Pricing Agreement and the
securities specified therein) certain of its preferred securities (the
"Securities") identified in Schedule I to the applicable Pricing Agreement (with
respect to such Pricing Agreement, the "Firm Designated Securities")
representing undivided beneficial interests in the assets of the Designated
Trust, guaranteed by the Guarantor to the extent set forth in the guarantee
agreement (the "Guarantee") identified in such Pricing Agreement. If specified
in such Pricing Agreement, the Designated Trust may grant to the Underwriters
the right to purchase at their election an additional number of Securities,
specified in such Pricing Agreement as provided
<PAGE>
 
in Section 3 hereof (the "Optional Designated Securities"). The Firm Designated
Securities and any Optional Designated Securities are collectively called the
"Designated Securities." The proceeds of the sale of the Designated Securities
and of common securities of the Designated Trust (the "Common Securities") sold
to the Guarantor are to be invested in junior subordinated deferrable interest
debentures of the Guarantor (the "Subordinated Debentures"), to be issued
pursuant to a junior subordinated indenture (the "Indenture") identified in the
Pricing Agreement. The Designated Securities may be exchangeable into
Subordinated Debentures, as specified in Schedule II to such Pricing Agreement.
Pursuant to the Guarantee Agreement identified in the Pricing Agreement relating
to any particular issuance of Designated Securities, the Designated Securities
will be guaranteed by the Guarantor to the extent set forth in such Pricing
Agreement (the "Guarantee").

     The terms and rights of any particular issuance of Designated Securities
shall be as specified in the Pricing Agreement relating thereto and in or
pursuant to the amended and restated trust agreement (the "Trust Agreement")
among the Guarantor, the trustees named therein (the "Trustees") and the holders
from time to time of the Designated Trust's securities issued thereunder.

     Particular sales of Designated Securities may be made from time to time to
the Underwriters of such Securities, for whom the firms designated as
representatives of the Underwriters of such Securities in the Pricing Agreement
relating thereto will act as representatives (the "Representatives"). The term
"Representatives" also refers to a single firm acting as sole representative of
the Underwriters and to Underwriters who act without any firm being designated
as their representative. This Underwriting Agreement shall not be construed as
an obligation of any Trust to sell any of the Securities or as an obligation of
any of the Underwriters to purchase any of the Securities. The obligation of any
Trust to issue and sell any of the Securities and the obligation of any of the
Underwriters to purchase any of the Securities shall be evidenced by the Pricing
Agreement with respect to the Securities specified therein. Each Pricing
Agreement shall specify the aggregate number of Firm Designated Securities, the
aggregate number of Optional Designated Securities, if any, the initial public
offering price of such Firm and Optional Designated Securities or the manner of
determining such price, the

                                      -2-
<PAGE>
 
terms of the Designated Securities, including the terms on which and terms of
the securities into which the Designated Securities will be exchangeable, the
purchase price to the Underwriters of such Designated Securities, the names of
the Underwriters of such Designated Securities, the names of the Representatives
of such Underwriters and the number of such Designated Securities to be
purchased by each Underwriter and the commission, if any, payable to the
Underwriters with respect thereto and shall set forth the date, time and manner
of delivery of such Designated Securities and payment therefor. The Pricing
Agreement shall also specify (to the extent not set forth in the Trust Agreement
or the registration statement and prospectus with respect thereto) the terms of
such Designated Securities. A Pricing Agreement shall be in the form of an
executed writing (which may be in counterparts), and may be evidenced by an
exchange of telegraphic communications or any other rapid transmission device
designed to produce a written record of communications transmitted. The
obligations of the Underwriters under this Agreement and each Pricing Agreement
shall be several and not joint.

     1.  Each of the Guarantor and each Designated Trust jointly and severally
represents and warrants to, and agrees with, each of the Underwriters that:

          (a) A registration statement on Form S-3 (File Nos. 333-18951, 333-
     18951-01, 333-18951-02 and 333-18951-03) in respect of the Securities, the
     Subordinated Debentures and the Guarantees has been filed with the
     Securities and Exchange Commission (the "Commission"); such registration
     statement and any post-effective amendment thereto, each in the form
     heretofore delivered or to be delivered to the Representatives and,
     excluding exhibits to such registration statement, but including all
     documents incorporated by reference in the prospectus contained therein, to
     the Representatives for each of the other Underwriters, have been declared
     effective by the Commission in such form; no other document with respect to
     such registration statement or document incorporated by reference therein
     has heretofore been filed or transmitted for filing with the Commission;
     and no stop order suspending the effectiveness of such registration
     statement has been issued and no proceeding for that purpose has been
     initiated or threatened by the Commission (any preliminary prospectus
     included in such registration statement or filed with the Commission

                                      -3-
<PAGE>
 
     pursuant to Rule 424(a) of the rules and regulations of the Commission
     under the Securities Act of 1933, as amended (the "Act"), being hereinafter
     called a "Preliminary Prospectus"; the various parts of such registration
     statement, including (i) the information contained in the form of final
     prospectus filed with the Commission pursuant to Rule 424(b) under the Act
     in accordance with Section 4(a) hereof and deemed by virtue of Rule 430A
     under the Act to be part of the registration statement at the time it was
     declared effective and (ii) all exhibits thereto and the documents
     incorporated by reference in the prospectus contained in the registration
     statement at the time such part of the registration statement became
     effective, being hereinafter called the "Registration Statement"; the
     prospectus relating to the Securities, the Subordinated Debentures and the
     Guarantees, in the form in which it has most recently been filed, or
     transmitted for filing, with the Commission on or prior to the date of this
     Agreement, being hereinafter called the "Prospectus"; any reference herein
     to any Preliminary Prospectus or the Prospectus shall be deemed to refer to
     and include the documents incorporated by reference therein pursuant to the
     applicable form under the Act, as of the date of such Preliminary
     Prospectus or Prospectus, as the case may be; any reference to any
     amendment or supplement to any Preliminary Prospectus or the Prospectus
     shall be deemed to refer to and include any documents filed after the date
     of such Preliminary Prospectus or Prospectus, as the case may be, under the
     Securities Exchange Act of 1934, as amended (the "Exchange Act"), and
     incorporated by reference in such Preliminary Prospectus or Prospectus, as
     the case may be; any reference to any amendment to the Registration
     Statement shall be deemed to refer to and include any annual report of the
     Guarantor filed pursuant to Section 13(a) or 15(d) of the Exchange Act
     after the effective date of the Registration Statement that is incorporated
     by reference in the Registration Statement; and any reference to the
     Prospectus, as amended or supplemented, shall be deemed to refer to the
     Prospectus, as amended or supplemented, in relation to the applicable
     Designated Securities in the form in which it is filed with the Commission
     pursuant to Rule 424(b) under the Act in accordance with Section 4(a)
     hereof, including any documents incorporated by reference therein as of the
     date of such filing);

                                      -4-
<PAGE>
 
          (b) No order preventing or suspending the use of any Preliminary
     Prospectus has been issued by the Commission, and each Preliminary
     Prospectus, at the time of filing thereof, conformed in all material
     respects to the requirements of the Act and the rules and regulations of
     the Commission thereunder, and did not contain an untrue statement of a
     material fact or omit to state a material fact required to be stated
     therein or necessary to make the statements therein, in light of the
     circumstances under which they were made, not misleading; provided,
     however, that this representation and warranty shall not apply to any
     statements or omissions made in reliance upon and in conformity with
     information furnished in writing to a Designated Trust or the Guarantor by
     an Underwriter of Designated Securities through the Representatives
     expressly for use in the Prospectus, as amended or supplemented, relating
     to such Securities.

          (c) The documents incorporated by reference in the Prospectus, when
     they became effective or were filed with the Commission, as the case may
     be, conformed in all material respects to the requirements of the Act or
     the Exchange Act, as applicable, and the rules and regulations of the
     Commission thereunder, and none of such documents contained an untrue
     statement of a material fact or omitted to state a material fact required
     to be stated therein or necessary to make the statements therein not
     misleading; and any further documents so filed and incorporated by
     reference in the Prospectus or any further amendment or supplement thereto,
     when such documents become effective or are filed with the Commission, as
     the case may be, will conform in all material respects to the requirements
     of the Act or the Exchange Act, as applicable, and the rules and
     regulations of the Commission thereunder and will not contain an untrue
     statement of a material fact or omit to state a material fact required to
     be stated therein or necessary to make the statements therein not
     misleading; provided, however, that this representation and warranty shall
     not apply to any statements or omissions made in reliance upon and in
     conformity with information furnished in writing to a Designated Trust or
     the Guarantor by an Underwriter of Designated Securities through the
     Representatives expressly for use in the Prospectus, as amended or
     supplemented, relating to such Securities;

                                      -5-
<PAGE>
 
          (d) The Registration Statement and the Prospectus conform, and any
     further amendments or supplements to the Registration Statement or the
     Prospectus will conform, in all material respects to the requirements of
     the Act and the Trust Indenture Act of 1939, as amended (the "Trust
     Indenture Act"), and the rules and regulations of the Commission thereunder
     and do not and will not, as of the applicable effective date as to the
     Registration Statement and any amendment thereto and as of the applicable
     filing date as to the Prospectus and any amendment or supplement thereto,
     contain an untrue statement of a material fact or omit to state a material
     fact required to be stated therein or necessary to make the statements
     therein not misleading; provided, however, that this representation and
     warranty shall not apply to any statements or omissions made in reliance
     upon and in conformity with information furnished in writing to a
     Designated Trust or the Guarantor by an Underwriter of Designated
     Securities through the Representatives expressly for use in the Prospectus,
     as amended or supplemented, relating to such Securities;
 
          (e) Since the respective dates as of which information is given in the
     Registration Statement and the Prospectus, there has not been any material
     adverse change, or any development involving a prospective material adverse
     change, in or affecting the general affairs, management, financial
     position, stockholders' equity or results of operations of the Guarantor
     and its subsidiaries, considered as a whole, otherwise than as set forth or
     contemplated in the Prospectus; and, since the respective dates as of which
     information is given in the Registration Statement and the Prospectus and
     except as otherwise set forth therein, there has not been any change in the
     capital stock (other than the Guarantor's purchase of treasury stock in
     connection with its buy back program and the issuance of stock upon the
     exercise of employee stock options, director stock awards, bonus stock
     awards and earn-outs of performance shares) or long-term debt in excess of
     $10 million of the Guarantor or any of its subsidiaries, otherwise than as
     set forth or contemplated in the Prospectus;

          (f) The Guarantor has been duly incorporated and is validly existing
     as a corporation in good standing under the laws of the jurisdiction of its

                                      -6-
<PAGE>
 
     incorporation, with power and authority (corporate and other) to own its
     properties and conduct its business as described in the Prospectus, and has
     been duly qualified as a foreign corporation for the transaction of
     business and is in good standing under the laws of each other jurisdiction
     in which it owns or leases properties or conducts any business so as to
     require such qualification, or is subject to no material liability or
     disability by reason of the failure to be so qualified in any such
     jurisdiction; each subsidiary of the Guarantor has been duly incorporated
     and is validly existing as a corporation in good standing under the laws of
     the jurisdiction of its incorporation, except where such failure to be in
     good standing would not have a material adverse effect on the financial
     condition, operating results or business prospects of such subsidiary; and
     The Northern Trust Company (the "Bank") has the power and authority
     (corporate and other) to own its properties and conduct its business as
     described in the Prospectus;

          (g) The Guarantor is duly registered under the Bank Holding Company
     Act of 1956, as amended; and each subsidiary of the Guarantor which
     conducts business as a bank is duly authorized to conduct such banking
     business in each jurisdiction in which such banking business is conducted;

          (h) The Guarantor has an authorized capitalization as set forth in the
     Prospectus, and all the issued shares of capital stock of the Guarantor
     have been duly and validly authorized and issued and are fully paid and
     non-assessable; and all of the issued shares of capital stock of each
     subsidiary of the Guarantor have been duly and validly authorized and
     issued, are fully paid and non-assessable, except as provided in 12 U.S.C.
     Section 55, and (except for directors' qualifying shares and except as set
     forth in the Prospectus) are owned directly or indirectly by the Guarantor,
     free and clear of all liens, encumbrances, equities or claims;

          (i) The Designated Trust has been duly created and is validly existing
     as a statutory business trust in good standing under the Delaware Business
     Trust Act with the power and authority to own its properties and conduct
     its business as described in the Prospectus, and the Designated Trust has
     conducted no business to date other than as contemplated by this Agreement
     and 

                                      -7-
<PAGE>
 
     any Pricing Agreement, and it will conduct no business in the future that
     would be inconsistent with the Trust Agreement and the description of the
     Designated Trust set forth in the Prospectus; the Designated Trust is not a
     party to or bound by any agreement or instrument other than this Agreement,
     any Pricing Agreement, the Trust Agreement and the agreements and
     instruments contemplated by the Trust Agreement; the Designated Trust has
     no liabilities or obligations other than those arising out of the
     transactions contemplated by this Agreement, any Pricing Agreement and the
     Trust Agreement and described in the Prospectus; based on expected
     operations and current law, the Designated Trust is not and will not be
     classified as an association taxable as a corporation for United States
     federal income tax purposes; and the Designated Trust is not a party to or
     subject to any action, suit or proceeding of any nature;

          (j) The Designated Securities have been duly and validly authorized by
     the Designated Trust, and, when issued and delivered against payment
     therefor as provided herein, will be duly and validly issued and fully paid
     and non-assessable undivided beneficial interests in the assets of the
     Designated Trust and will conform to the description of the Designated
     Securities contained in the Prospectus; the issuance of the Designated
     Securities is not subject to preemptive or other similar rights; the
     Designated Securities will have the rights set forth in the Trust
     Agreement, and the terms of the Designated Securities are valid and binding
     on the Designated Trust; and the holders of the Designated Securities (the
     "Securityholders") 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;

          (k) The Common Securities of the Designated Trust have been duly and
     validly authorized by the Designated Trust and, upon delivery by the
     Designated Trust to the Guarantor against payment therefor as described in
     the Prospectus, will be duly and validly issued undivided beneficial
     interests in the assets of the Designated Trust and will conform in all
     material respects to the description thereof contained in the Prospectus;
     the issuance of the Common Securities is not subject to preemptive or other
     similar rights; and at the Time of 

                                      -8-
<PAGE>
 
     Delivery, all of the issued and outstanding Common Securities of the
     Designated Trust will be directly owned by the Guarantor free and clear of
     any security interest, mortgage, pledge, lien, encumbrance, claim or
     equity;

          (l) The Guarantee, the Subordinated Debentures, the Trust Agreement,
     the Indenture and the Agreement as to Expenses and Liabilities between the
     Guarantor and the Designated Trust (the "Expense Agreement"); the
     Guarantee, the Subordinated Debentures, the Trust Agreement, the Indenture
     and the Expense Agreement being collectively referred to as the "Guarantor
     Agreements"), when validly executed and delivered by the Guarantor and, in
     the case of the Guarantee, by the Guarantee Trustee, in the case of the
     Trust Agreement, by the Trustees and, in the case of the Indenture, by the
     Debenture Trustee, will constitute valid and legally binding obligations of
     the Guarantor, enforceable in accordance with their respective terms,
     except as such enforcement may be limited by (i) bankruptcy, insolvency,
     moratorium, receivership, reorganization, liquidation, fraudulent
     conveyance or transfer and other laws relating to or affecting creditors'
     rights generally, (ii) by general equitable principles and (iii), with
     respect to the Expense Agreement, the effect of public policy on the
     enforceability of provisions relating to indemnification and contribution;
     the Subordinated Debentures are entitled to the benefits of the Indenture;
     and the Guarantor Agreements will conform to the descriptions thereof in
     the Prospectus;

          (m) The execution and delivery of this Agreement, any Pricing
     Agreement and the Guarantor Agreements, and the consummation of the
     transactions contemplated herein and therein, have been duly authorized by
     all necessary corporate action and when executed by the Guarantor and the
     other parties thereto will not result in a breach or violation of any of
     the terms or provisions of, or constitute a default under, or result in the
     creation or imposition of any security interest, lien, charge or
     encumbrance upon any property or assets of the Guarantor (other than the
     Designated Trust), pursuant to any indenture, mortgage, deed of trust, loan
     agreement, contract or other agreement or instrument to which the Guarantor
     is a party or by which the Guarantor is bound or to which any of its

                                      -9-
<PAGE>
 
     property or assets is subject, or to which any subsidiary of the Guarantor
     is a party or by which any subsidiary of the Guarantor is bound or to which
     any of its assets or property is subject where such subsidiary's breach or
     violation would have a material adverse effect on the Guarantor and its
     subsidiaries, considered as a whole, or would materially impair the ability
     of the Guarantor to perform any of its obligations hereunder, under any
     Pricing Agreement or in the Guarantor Agreements, nor will such action
     result in any violation of the provisions of the Restated Certificate of
     Incorporation, as amended, or the By-laws of the Guarantor or any statute
     or any order, rule or regulation of any court or governmental agency or
     body having jurisdiction over the Guarantor, its subsidiaries or any of
     their respective properties; and no consent, approval, authorization,
     order, registration or qualification of or with any such court or
     governmental agency or body is required for the issue and sale of the
     Designated Securities or the consummation by the Guarantor or the
     Designated Trust of the transactions contemplated by this Agreement, any
     Pricing Agreement or the Guarantor Agreements, except such as have been, or
     will have been, obtained or received prior to the applicable First Time of
     Delivery (as defined in Section 3 hereof) and such consents, approvals,
     authorizations, registrations or qualifications as may be required under
     state securities or Blue Sky laws in connection with the purchase and
     distribution of the Designated Securities by the Underwriters;

          (n) Neither the Designated Trust nor the Guarantor is, and after
     giving effect to the offering and sale of the Designated Securities,
     neither the Designated Trust nor the Guarantor will be, an "investment
     company", or an entity "controlled" by an "investment company", as such
     terms are defined in the Investment Company Act of 1940, as amended (the
     "Investment Company Act");

          (o) Except as set forth or contemplated in the Prospectus, there is
     not pending or, to the Guarantor's knowledge, threatened, any actions,
     suits or proceedings to which the Guarantor or any of its subsidiaries is a
     party, before or by any court or governmental agency or body, which, taking
     into account the likelihood of the outcome, the damages or other relief
     sought and other relevant factors, individually 

                                      -10-
<PAGE>
 
     and in the aggregate, would reasonably be expected to result in any
     material adverse change, or any development involving a prospective
     material adverse change, in or affecting the general affairs, management,
     financial position, stockholders' equity or results of operations of the
     Guarantor and its subsidiaries taken as a whole;

          (p) The statements set forth in the Prospectus under the captions
     "Description of Junior Subordinated Debentures", "Description of Preferred
     Securities", "Description of Guarantees" and "Relationship Among the
     Preferred Securities, the Corresponding Junior Subordinated Debentures, the
     Expense Agreement and the Guarantees", insofar as they constitute a summary
     of the terms of the Securities, the Subordinated Debentures, the Guarantees
     and the Guarantor Agreements, are accurate and complete in all material
     respects;

          (q) To the Guarantor's knowledge, Arthur Andersen LLP, who certified
     the financial statements of the Guarantor and its subsidiaries included in
     or incorporated by reference in the Prospectus, are independent public
     accountants as required by the Act and the rules and regulations of the
     Commission thereunder; and

          (r) The Guarantor and its affiliates have complied, and as of the date
     of any Pricing Agreement will comply, with all of the provisions of Section
     517.075, Florida Statutes, and all rules and regulations promulgated
     thereunder, relating to issuers doing business in Cuba.

     2.   Upon the execution of the Pricing Agreement applicable to any
Designated Securities and authorization by the Representatives of the release of
such Designated Securities, the several Underwriters propose to offer the Firm
Designated Securities for sale upon the terms and conditions set forth in the
Prospectus, as amended or supplemented.

          The Designated Trust may specify in the Pricing Agreement applicable
to any Designated Securities that the Designated Trust thereby grants to the
Underwriters the right (an "Over-allotment Option") to purchase at their
election up to the number of Optional Designated Securities 

                                      -11-
<PAGE>
 
set forth in such Pricing Agreement, on the terms set forth in the paragraph
above, for the sole purpose of covering over-allotments in the sale of the Firm
Designated Securities. Any such election to purchase Optional Designated
Securities may be exercised only by written notice from the Representatives to
the Designated Trust and the Guarantor, given within a period specified in the
Pricing Agreement, setting forth the aggregate number of Optional Designated
Securities to be purchased and the date on which such Optional Designated
Securities are to be delivered, as determined by the Representatives but in no
event earlier than the First Time of Delivery or, unless the Representatives,
the Guarantor and the Designated Trust otherwise agree in writing, earlier than
or later than the respective number of business days after the date of such
notice set forth in such Pricing Agreement.

          The number of Optional Designated Securities to be added to the number
of Firm Designated Securities to be purchased by each Underwriter as set forth
in Schedule I to the Pricing Agreement applicable to such Designated Securities
shall be, in each case, the number of Optional Designated Securities which each
of the Guarantor and the Designated Trust has been advised by the
Representatives have been attributed to such Underwriter, provided that, if each
of the Guarantor and the Designated Trust has not been so advised, the number of
Optional Designated Securities to be so added shall be, in each case, that
proportion of Optional Designated Securities which the number of Firm Designated
Securities to be purchased by such Underwriter under such Pricing Agreement
bears to the aggregate number of Firm Designated Securities (rounded as the
Representatives may determine to the nearest 100 securities).  The total number
of Designated Securities to be purchased by all the Underwriters pursuant to
such Pricing Agreement shall be the aggregate number of Firm Designated
Securities set forth in Schedule I to such Pricing Agreement plus the aggregate
number of Optional Designated Securities which the Underwriters elect to
purchase.

     3.   Designated Securities to be purchased by each Underwriter pursuant to
the Pricing Agreement relating thereto, in definitive form to the extent
practicable, and in such authorized denominations and registered in such names
as the Representatives may request upon at least forty-eight hours' prior notice
to the Designated Trust, shall be delivered by or on behalf of the Designated
Trust to the Representatives for the account of such Underwriter, 

                                      -12-
<PAGE>
 
against payment by such Underwriter or on its behalf of the purchase price
therefor by certified or official bank check or checks, payable to the order of
the Designated Trust in the funds specified in such Pricing Agreement, all in
the manner and at the place and time and date specified in such Pricing
Agreement or at such other place and time and date as the Representatives and
the Designated Trust may agree upon in writing. Such time and date for delivery
of Firm Designated Securities pursuant to the Pricing Agreement relating thereto
is herein called the "First Time of Delivery," such time and date for delivery
of Optional Designated Securities, if not the First Time of Delivery, is herein
called the "Second Time of Delivery," and each such time and date is herein
called the "Time of Delivery."

     4.   The Designated Trust and the Guarantor jointly and severally agree
with each of the Underwriters of any Designated Securities:

          (a) To prepare the Prospectus as amended and supplemented in relation
     to the applicable Designated Securities in a form approved by the
     Representatives and to file such Prospectus pursuant to Rule 424(b) under
     the Act not later than the Commission's close of business on the second
     business day following the execution and delivery of the Pricing Agreement
     relating to the applicable Designated Securities or, if applicable, such
     earlier time as may be required by Rule 424(b); to make no further
     amendment or any supplement to the Registration Statement or Prospectus, as
     amended or supplemented, after the date of the Pricing Agreement relating
     to such Securities and prior to the Time of Delivery for such Securities
     which shall be disapproved by the Representatives for such Securities
     promptly after reasonable notice thereof, to advise you promptly after it
     receives notice thereof of the time when the Registration Statement, or any
     amendment thereto, has been filed or becomes effective or any supplement to
     the Prospectus or any amended Prospectus has been filed and to furnish the
     Representatives with copies thereof; to advise the Representatives promptly
     of any such amendment or supplement after such Time of Delivery and furnish
     the Representatives with copies thereof; to file promptly all reports and
     any definitive proxy or information statements required to be filed by the
     Guarantor with the Commission pursuant to Section 13(a), 13(c), 14 or 15(d)
     of the Exchange Act subsequent to the date of the 

                                      -13-
<PAGE>
 
     Prospectus and for so long as the delivery of a prospectus is required in
     connection with the offering or sale of such Securities, and during such
     same period to advise the Representatives, promptly after it receives
     notice thereof, of the time when any amendment to the Registration
     Statement has been filed or becomes effective or any supplement to the
     Prospectus or any amended Prospectus has been filed with the Commission, of
     the issuance by the Commission of any stop order or of any order preventing
     or suspending the use of any prospectus relating to the Securities, of the
     suspension of the qualification of such Securities or the Subordinated
     Debentures issuable upon exchange of the Securities for offering or sale in
     any jurisdiction, of the initiation or threatening of any proceeding for
     any such purpose, or of any request by the Commission for the amending or
     supplementing of the Registration Statement or Prospectus or for additional
     information; and, in the event of the issuance of any such stop order or of
     any such order preventing or suspending the use of any prospectus relating
     to the Securities or suspending any such qualification, to use promptly its
     best efforts to obtain its withdrawal;

          (b) Promptly from time to time to take such action as the
     Representatives may reasonably request to qualify such Securities or the
     Subordinated Debentures issuable upon exchange of the Securities for
     offering and sale under the securities laws of such jurisdictions as the
     Representatives may request and to comply with such laws so as to permit
     the continuance of sales and dealings therein in such jurisdictions for as
     long as may be necessary to complete the distribution of such Designated
     Securities, provided that in connection therewith neither the Designated
     Trust nor the Guarantor shall be required to qualify as a foreign
     corporation or to file a general consent to service of process in any
     jurisdiction;

          (c) To furnish the Underwriters with copies of the Prospectus, as
     amended or supplemented, in such quantities as the Representatives may from
     time to time reasonably request, and, if the delivery of a prospectus is
     required at any time prior to the expiration of nine months after the time
     of issue of the Prospectus in connection with the offering or sale of the
     Securities or the Subordinated Debentures issuable upon exchange of the
     Securities and if at such time any event shall have occurred as a result of
     which 

                                      -14-
<PAGE>
 
     the Prospectus as then amended or supplemented would include an untrue
     statement of a material fact or omit to state any material fact necessary
     in order to make the statements therein, in the light of the circumstances
     under which they were made when such Prospectus is delivered, not
     misleading, or, if for any other reason it shall be necessary during such
     same period to amend or supplement the Prospectus or to file under the
     Exchange Act any document incorporated by reference in the Prospectus in
     order to comply with the Act, the Exchange Act or the Trust Indenture Act,
     to notify the Representatives and upon the request of the Representatives
     to file such document and to prepare and furnish without charge to each
     Underwriter and to any dealer in securities as many copies as the
     Representatives may from time to time reasonably request of an amended
     Prospectus or a supplement to the Prospectus which will correct such
     statement or omission or effect such compliance, and in case any
     Underwriter is required to deliver a prospectus in connection with the
     offering or sale of the Securities or the Subordinated Debentures issuable
     upon exchange of the Securities at any time nine months or more after the
     time of issue of the Prospectus, upon an Underwriter's request but at the
     expense of such Underwriter, to prepare and deliver to such Underwriter as
     many copies as such Underwriter may request of an amended or supplemented
     Prospectus complying with Section 10(a)(3) of the Act;

          (d) In the case of the Guarantor, to make generally available to its
     security holders as soon as practicable, but in any event not later than
     eighteen months after the effective date of the Registration Statement (as
     defined in Rule 158(c)), an earnings statement of the Guarantor and its
     subsidiaries (which need not be audited) complying with Section 11(a) of
     the Act and the rules and regulations of the Commission thereunder
     (including, at the option of the Guarantor, Rule 158);

          (e) During the period beginning from the date of the Pricing Agreement
     for such Designated Securities and continuing to and including the later of
     (i) the termination of trading restrictions for such Designated Securities,
     as notified to the Guarantor by the Representatives and (ii) the last Time
     of Delivery for such Designated Securities, not to offer, sell, contract to
     sell or otherwise dispose of, except as 

                                      -15-
<PAGE>
 
     provided hereunder, any Securities, any other beneficial interests in the
     assets of the Designated Trust, or any preferred securities or any other
     securities of the Designated Trust or the Guarantor, as the case may be,
     that are substantially similar to such Designated Securities (including any
     guarantee of such securities) or any securities that are convertible into
     or exchangeable for, or that represent the right to receive securities,
     preferred securities or any such substantially similar securities of either
     the Designated Trust or the Guarantor without the prior written consent of
     the Representatives;

          (f) Not to have the Designated Trust be or become, at any time prior
     to the expiration of three years after the Time of Delivery, an open-end
     investment company, unit investment trust, closed-end investment company or
     face-amount certificate company that is or is required to be registered
     under Section 8 of the Investment Company Act;

          (g) In the case of the Guarantor, to issue the Guarantee concurrently
     with the issue and sale of the Designated Securities as contemplated herein
     or in the Pricing Agreement; and

          (h) If provided in the applicable Pricing Agreement, to use its best
     efforts to list, subject to notice of issuance, the Designated Securities
     on the Nasdaq Stock Market.

     5.   The Guarantor and the Designated Trust jointly and severally covenant
and agree with the several Underwriters that the Guarantor and the Designated
Trust will pay or cause to be paid the following: (i) the fees, disbursements
and expenses of the Guarantor's or the Designated Trust's counsel and
accountants in connection with the issue of the Designated Securities and all
other expenses in connection with the preparation, printing and distribution of
the Registration Statement, any Preliminary Prospectus and the Prospectus and
any amendments and supplements thereto and the mailing and delivering of copies
thereof to the Underwriters and dealers; (ii) the cost of printing or producing
any Agreement among Underwriters, this Agreement, any Pricing Agreement, any
Guarantor Agreement, any Blue Sky and Legal Investment Memoranda, closing
documents (including any compilations thereof) and any other documents in
connection with the offering, purchase, sale and delivery of the Designated
Securities; (iii) all expenses in connection 

                                      -16-
<PAGE>
 
with the qualification of the Designated Securities and the Subordinated
Debentures issuable upon exchange of the Securities for offering and sale under
state securities laws as provided in Section 4(b) hereof, including the
reasonable fees and disbursements of counsel for the Underwriters in connection
with such qualification and in connection with the Blue Sky and legal investment
surveys; (iv) any fees charged by securities rating services for rating the
Designated Securities and the Subordinated Debentures; (v) any filing fees
incident to, and the fees and disbursements of counsel for the Underwriters in
connection with, any required reviews by the National Association of Securities
Dealers, Inc. of the terms of the sale of the Designated Securities and the
issuance of the Guarantees and the Subordinated Debentures; (vi) the cost of
preparing certificates for the Designated Securities and the Subordinated
Debentures; (vii) the fees and expenses of the Trustees, the Debenture Trustee
and the Guarantee Trustee and any agent of the Guarantee Trustee and the
Debenture Trustee and the fees and disbursements of counsel for the Trustees in
connection with the Trust Agreement and the Designated Securities, counsel for
the Guarantee Trustee in connection with the Guarantee and counsel for the
Debenture Trustee in connection with the Indenture and the Subordinated
Debentures; (viii) the cost of qualifying the Designated Securities with The
Depository Trust Company; (ix) all fees and expenses, if any, in connection with
the listing of the Designated Securities on the Nasdaq Stock Market and the cost
of registering the Designated Securities under Section 12 of the Exchange Act;
and (x) all other costs and expenses incident to the performance of its
obligations hereunder and under any Over-allotment Option which are not
otherwise specifically provided for in this Section. It is understood, however,
that, except as provided in this Section, Section 7 and Section 10 hereof, the
Underwriters will pay all of their own costs and expenses, including the fees of
their counsel, transfer taxes on resale of any of the Designated Securities by
them, and any advertising expenses connected with any offers they may make.

     6. The obligations of the Underwriters of any Designated Securities under
the Pricing Agreement relating to such Designated Securities shall be subject,
in the discretion of the Representatives, to the condition that all
representations and warranties and other statements of the Designated Trust and
the Guarantor in or incorporated by reference in the Pricing Agreement relating
to such Designated Securities are, at and as of the respective Time

                                     -17-
<PAGE>
 
of Delivery for such Designated Securities, true and correct, the condition that
the Designated Trust and the Guarantor shall have performed all of their
respective obligations hereunder theretofore to be performed, and the following
additional conditions:

          (a) The Prospectus, as amended or supplemented, in relation to the
     applicable Designated Securities shall have been filed with the Commission
     pursuant to Rule 424(b) within the applicable time period prescribed for
     such filing by the rules and regulations under the Act and in accordance
     with Section 4(a) hereof; no stop order suspending the effectiveness of the
     Registration Statement or any part thereof shall have been issued and no
     proceeding for that purpose shall have been initiated or threatened by the
     Commission; and all requests for additional information on the part of the
     Commission shall have been complied with to the Representatives' reasonable
     satisfaction;
 
          (b) Sullivan & Cromwell shall have furnished to the Representatives
     such opinion or opinions, dated the respective Time of Delivery for such
     Designated Securities, with respect to such matters as the Representatives
     may reasonably request, and such counsel shall have received such papers
     and information as they may reasonably request to enable them to pass upon
     such matters. In giving such opinion, Sullivan & Cromwell may rely, as to
     all matters governed by the laws of jurisdictions in which such counsel is
     not qualified, upon opinions of other counsel, who shall be counsel
     satisfactory to counsel for the Representatives, in which case the opinion
     or opinions shall state that they believe you and they are entitled to rely
     on such opinions;

          (c) Peter L. Rossiter, Esq., or the then General Counsel for the
     Guarantor, shall have furnished to the Representatives his or her written
     opinion, dated the respective Time of Delivery for such Designated
     Securities, in form and substance satisfactory to the Representatives, to
     the effect that:

               (i) All of the issued shares of capital stock of the Guarantor
          have been duly and validly authorized and issued and are fully paid
          and non-assessable;

               (ii) Each subsidiary of the Guarantor which

                                     -18-
<PAGE>
 
          conducts business as a bank is duly authorized to conduct such banking
          business and/or trust business as it conducts in each jurisdiction in
          the United States in which it maintains offices for the conduct of
          such banking and/or trust business (such counsel being entitled to
          rely in respect of the opinion in this clause upon opinions of local
          counsel and in respect of matters of fact upon certificates of
          officers of the Guarantor, provided that such counsel shall state that
          he believes that both you and he are justified in relying upon such
          opinions and certificates);

               (iii) All of the issued and outstanding shares of capital stock
          of each of the subsidiaries of the Guarantor listed in Annex I hereto
          have been duly and validly authorized and issued and are fully paid
          and non-assessable, except as provided in 12 U.S.C. Section 55; and
          all of such shares of capital stock are owned directly or indirectly
          by the Guarantor free and clear of any liens, claims, encumbrances or
          rights of others (except for directors' qualifying shares and except
          as set forth in the Prospectus, as amended or supplemented); and

               (iv) The documents, as amended prior to the date hereof,
          incorporated by reference in the Prospectus (other than the financial
          statements and related financial information and schedules therein, as
          to which such counsel need express no opinion), when they were filed
          with the Commission or as so amended, complied as to form in all
          material respects with the requirements of the Exchange Act and the
          rules and regulations of the Commission thereunder; and he has no
          reason to believe that any such documents, when such documents were so
          filed, contained an untrue statement of a material fact or omitted to
          state a material fact necessary in order to make the statements
          therein, in light of the circumstances under which they were made when
          such documents were so filed, not misleading.

          (d) Schiff Hardin & Waite, counsel for the Designated Trust and the
     Guarantor, shall have furnished to the Representatives their written
     opinion, dated the respective Time of Delivery for such

                                     -19-
<PAGE>
 
     Designated Securities, in form and substance satisfactory to the
     Representatives, to the effect that:

               (i) The Guarantor has been duly incorporated and is validly
          existing as a corporation in good standing under the laws of Delaware,
          with corporate power and authority to own its properties and conduct
          its business as described in the Prospectus, as amended or
          supplemented;

               (ii) The Guarantor has an authorized capitalization as set forth
          in the Prospectus, as amended or supplemented;

               (iii) The Guarantor has been duly qualified as a foreign
          corporation for the transaction of business and is in good standing
          under the laws of each jurisdiction in which it owns or leases
          properties or conducts any business so as to require such
          qualification or is subject to no material liability or disability by
          reason of the failure to be so qualified in any such jurisdiction
          (such counsel being entitled to rely in respect of the opinion in this
          clause upon opinions of local counsel and in respect of matters of
          fact upon certificates of officers of the Guarantor, provided that
          such counsel shall state that they believe both you and they are
          justified in relying upon such opinions or certificates);

               (iv) The Bank has been duly incorporated and is validly existing
          as a banking corporation in good standing under the laws of Illinois,
          with power and authority (corporate and other) to own its properties
          and conduct its business as described in the Prospectus, as amended or
          supplemented;

               (v) The Guarantor is duly registered under the Bank Holding
          Company Act of 1956, as amended;

               (vi) This Agreement and the Pricing Agreement with respect to the
          Designated Securities have been duly authorized, executed and
          delivered by the Designated Trust and the Guarantor;

                                     -20-
<PAGE>
 
               (vii) The Guarantor Agreements have each been duly authorized,
          executed and delivered by the Guarantor and/or the Designated Trust,
          as the case may be, and the Guarantor Agreements (other than the Trust
          Agreement, as to which such counsel need express no opinion)
          constitute valid and legally binding instruments and obligations of
          the Guarantor and/or the Designated Trust, as the case may be,
          enforceable against the Guarantor and/or the Designated Trust, as the
          case may be, in accordance with their respective terms, except as such
          enforcement may be limited by (a) bankruptcy, insolvency, moratorium,
          receivership, reorganization, liquidation, fraudulent conveyance or
          transfer and other laws relating to or affecting creditors' rights
          generally, (b) by general equitable principles and (c), with respect
          to the Expense Agreement, the effect of public policy on the
          enforceability of provisions relating to indemnification and
          contribution; and the Subordinated Debentures are entitled to the
          benefits provided by the Indenture;

               (viii) No consent, approval, authorization, order, registration
          or qualification of or with any court or governmental agency or body
          is required for the issue and sale of the Guarantee or the
          Subordinated Debentures or consummation by the Guarantor of the
          transactions contemplated by this Agreement or the Guarantor
          Agreements, except such consents, approvals, authorizations,
          registrations or qualifications as may be required under state
          securities or Blue Sky laws in connection with the purchase and
          distribution of the Designated Securities by the Underwriters;

               (ix) The issue by the Guarantor of the Guarantee and the
          Subordinated Debentures, the compliance by the Guarantor with all of
          the provisions of this Agreement and the Guarantor Agreements, the
          execution, delivery and performance by the Guarantor of this Agreement
          and the Guarantor Agreements and the consummation of the transactions
          herein and therein contemplated will not result in a breach or
          violation of any of the terms or provisions of, or constitute a
          default under, any indenture, mortgage, deed of trust, loan agreement
          or other agreement or instrument filed by the Guarantor as an exhibit
          to

                                     -21-
<PAGE>
 
          any report filed pursuant to the Act or Exchange Act on or after the
          filing of the Annual Report on Form 10-K for the year ended December
          31, 1995, where such subsidiary's breach or violation would have a
          material adverse effect on the Guarantor and its subsidiaries,
          considered as a whole, or would materially impair the ability of the
          Guarantor to perform any of its obligations hereunder or under the
          Guarantor Agreements, nor will such actions result in any violation of
          the provisions of the Restated Certificate of Incorporation, as
          amended, or By-Laws of the Guarantor or the Articles of Organization
          or By-laws of the Bank or, to the knowledge of such counsel, any
          statute or any order, rule or regulation of any court or governmental
          agency or body having jurisdiction over the Guarantor or any of its
          subsidiaries or any of their properties;

               (x) The statements set forth in the Prospectus under the caption
          "Description of Junior Subordinated Debentures", "Description of
          Preferred Securities", "Description of Guarantees", "Description of
          Corresponding Junior Subordinated Debentures" and "Relationship Among
          the Preferred Securities, the Corresponding Junior Subordinated
          Debentures, the Expense Agreement and the Guarantees" insofar as they
          purport to summarize certain provisions of documents specifically
          referred to therein, are accurate summaries of such provisions in all
          material respects;

               (xi) Neither the Designated Trust nor the Guarantor is an
          "investment company" or an entity controlled by an "investment
          company" required to be registered under the Investment Company Act;

               (xii) The documents, as amended prior to the date hereof,
          incorporated by reference in the Prospectus, as amended or
          supplemented (other than the financial statements and related
          financial information and schedules therein, as to which such counsel
          need express no opinion), when they became effective or were filed
          with the Commission, as the case may be, complied as to form in all
          material respects with the requirements of the Act or the Exchange
          Act, as

                                     -22-
<PAGE>
 
          applicable, and the rules and regulations of the Commission
          thereunder; and nothing has come to such counsel's attention that
          would lead such counsel to believe that any of such documents, when
          they became effective or were so filed, as the case may be, contained,
          in the case of a registration statement which became effective under
          the Act, an untrue statement of a material fact or omitted to state a
          material fact required to be stated therein or necessary to make the
          statements therein not misleading, and, in the case of other documents
          which were filed under the Act or the Exchange Act with the
          Commission, an untrue statement of a material fact or omitted to state
          a material fact necessary in order to make the statements therein, in
          the light of the circumstances under which they were made when such
          documents were so filed, not misleading; it being understood that such
          counsel need express no opinion as to the financial statements or
          other financial information included in any of the documents mentioned
          in this clause and that such counsel may state that they have not
          independently verified factual statements in any such documents; and

               (xiii) The Registration Statement and the Prospectus, as amended
          or supplemented, and any further amendments and supplements thereto
          made by the Guarantor or the Designated Trust prior to the Time of
          Delivery for the Designated Securities (other than the financial
          statements and related financial information and schedules therein, as
          to which such counsel need express no opinion) comply as to form in
          all material respects with the requirements of the Act and the Trust
          Indenture Act and the rules and regulations thereunder; such nothing
          has come to such counsel's attention that would lead such counsel to
          believe that, as of its effective date, the Registration Statement or
          any further amendment thereto made by the Guarantor or the Designated
          Trust prior to the Time of Delivery (other than the financial
          statements and related financial information and schedules therein, as
          to which such counsel need express no opinion) contained an untrue
          statement of a material fact or omitted to state a material fact
          required to be stated therein or necessary to make the statements
          therein not misleading or that, as of its date,

                                     -23-
<PAGE>
 
          the Prospectus, as amended or supplemented, or any further amendment
          or supplement thereto made by the Guarantor or the Designated Trust
          prior to the Time of Delivery (other than the financial statements and
          related financial information and schedules therein, as to which such
          counsel need express no opinion) contained an untrue statement of a
          material fact or omitted to state a material fact necessary in order
          to make the statements therein, in light of the circumstances in which
          they were made, not misleading or that, as of the Time of Delivery,
          either the Registration Statement or the Prospectus, as amended or
          supplemented, or any further amendment or supplement thereto made by
          the Guarantor or the Designated Trust prior to the Time of Delivery
          (other than the financial statements and related financial information
          and schedules therein, as to which such counsel need express no
          opinion) contains an untrue statement of a material fact or omits to
          state a material fact necessary in order to make the statements
          therein, in light of the circumstances in which they were made, not
          misleading; and such counsel does not know of any amendment to the
          Registration Statement required to be filed or any contracts or other
          documents of a character required to be filed as an exhibit to the
          Registration Statement or required to be incorporated by reference
          into the Prospectus, as amended or supplemented, or required to be
          described in the Registration Statement or the Prospectus, as amended
          or supplemented, which are not filed or incorporated by reference or
          described as required;

          (e) Richards, Layton & Finger, special Delaware counsel to the
     Designated Trust and the Guarantor, shall have furnished to you, the
     Guarantor and the Designated Trust their written opinion, dated the
     respective Time of Delivery, in form and substance satisfactory to you, to
     the effect that:

               (i) The Designated Trust has been duly created and is validly
          existing as a business trust in good standing under the Delaware
          Business Trust Act and, under the Trust Agreement and the Delaware
          Business Trust Act, has the trust power and authority to own its
          properties and conduct its business, all as described in the
          Prospectus,

                                     -24-
<PAGE>
 
          and all filings required under the laws of the State of Delaware with
          respect to the creation and valid existence of the Designated Trust as
          a business trust have been made;

               (ii) The Trust Agreement constitutes a valid and binding
          obligation of the Guarantor and the Trustees, and is enforceable
          against the Guarantor and the Trustees, in accordance with its terms,
          and the terms of the Designated Securities as set forth in the Trust
          Agreement are valid and binding obligations of the Designated Trust in
          accordance with the terms of the Trust Agreement, all subject to the
          effect upon the Trust Agreement of (a) bankruptcy, insolvency,
          moratorium, receivership, reorganization, liquidation, fraudulent
          conveyance or transfer and other similar laws relating to or affecting
          the rights and remedies of creditors generally, (b) principles of
          equity, including applicable law relating to fiduciary duties
          (regardless of whether considered and applied in a proceeding in
          equity or at law), and (c) the effect of applicable public policy on
          the enforceability of provisions relating to indemnification or
          contribution;

               (iii) Under the Trust Agreement and the Delaware Business Trust
          Act, the Designated Trust has the trust power and authority to (a)
          execute and deliver this Agreement and the Pricing Agreement and to
          perform its obligations under this Agreement and the Pricing
          Agreement, and (b) issue and perform its obligations under the
          Designated Securities and the Common Securities;

               (iv) Under the Trust Agreement and the Delaware Business Trust
          Act, the execution and delivery by the Designated Trust of this
          Agreement and the Pricing Agreement and the performance by the
          Designated Trust of its obligations hereunder and thereunder have been
          duly authorized by all necessary trust action on the part of the
          Designated Trust;

               (v) The Designated Securities have been duly and validly
          authorized by the Trust Agreement, and, when issued and delivered
          against payment therefor as provided herein, will be duly and validly
          issued and, subject to the qualifications

                                     -25-
<PAGE>
 
          set forth herein, fully paid and non-assessable undivided beneficial
          interests in the assets of the Designated Trust; under the Trust
          Agreement and the Delaware Business Trust Act, the issuance of the
          Designated Securities is not subject to preemptive or other similar
          rights; the Designated Securities will have the rights set forth in
          the Trust Agreement (subject to the terms of the Trust Agreement); the
          Securityholders, as beneficial owners of the Designated 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; provided that such
          counsel may note that the Securityholders may be obligated, pursuant
          to the Trust Agreement, to (a) provide indemnity and/or security in
          connection with and pay taxes or governmental charges arising from
          transfers or exchanges of Preferred Securities Certificates (as
          defined in the Trust Agreement) and the issuance of replacement
          Preferred Securities Certificates and (b) provide security and
          indemnity in connection with requests of or directions to the Property
          Trustee (as defined in the Trust Agreement) to exercise its rights and
          remedies under the Trust Agreement;

               (vi) The Common Securities of the Designated Trust and the
          Expense Agreement have been duly and validly authorized by the Trust
          Agreement; under the Trust Agreement and the Delaware Business Trust
          Act, the issuance of the Common Securities is not subject to
          preemptive or other similar rights;

               (vii) The issue and sale of the Designated Securities and the
          Common Securities by the Designated Trust, the execution and delivery
          of this Agreement by the Designated Trust, the compliance by the
          Designated Trust with all of the provisions of the Designated
          Securities, the Trust Agreement, this Agreement and the Pricing
          Agreement, the purchase by the Designated Trust of the Subordinated
          Debentures and the consummation of the transactions herein and therein
          contemplated do not violate (a) the Trust Agreement or the Certificate
          of Trust of the Designated Trust or (b) any applicable Delaware

                                     -26-
<PAGE>
 
          law, rule or regulation;

               (viii) No authorization, approval, consent or order of any
          Delaware court or Delaware governmental authority or Delaware agency
          is required to be obtained by the Designated Trust solely in
          connection with the issuance and sale of the Designated Securities and
          the Common Securities; and

               (ix) Assuming that the Designated Trust derives no income from or
          connected with sources within the State of Delaware and has no assets,
          activities (other than having a Delaware trustee as required by the
          Delaware Business Trust Act and filing documents with the Delaware
          Secretary of State) or employees in the State of Delaware and that the
          Designated Trust is treated as a grantor trust for United States
          federal income tax purposes, the Securityholders (other than those
          holders of the Designated Securities who reside or are domiciled in
          the State of Delaware) will have no liability for income taxes imposed
          by the State of Delaware solely as a result of their participation in
          the Designated Trust, and the Designated Trust will not be liable for
          any income tax imposed by the State of Delaware.

          In giving such opinion, Richards, Layton & Finger may rely, as to all
     matters governed by the laws of jurisdictions in which such counsel is not
     qualified, upon opinions of other counsel, who shall be counsel
     satisfactory to counsel for the Representatives, in which case the opinion
     shall state that they believe you and they are entitled to rely on such
     opinions.

          (f) Schiff Hardin & Waite, tax counsel for the Designated Trust and
     the Guarantor, shall have furnished to you their written opinion, dated the
     respective Time of Delivery, in form and substance satisfactory to you, to
     the effect that such firm confirms its opinion set forth in the Prospectus
     under the caption "Certain Federal Income Tax Consequences";

          (g) At the respective Time of Delivery for such Designated Securities,
     and, if so specified in the Pricing Agreement, on the date of the Pricing
     Agreement, Arthur Andersen LLP, the independent

                                     -27-
<PAGE>
 
     accountants of the Guarantor who have certified the financial statements of
     the Guarantor and its subsidiaries included or incorporated by reference in
     the Registration Statement, shall have furnished to the Representatives a
     letter, dated such Time of Delivery and, if applicable, such date of the
     Pricing Agreement, respectively, to the effect set forth in Annex II
     hereto, and with respect to such letter dated such Time of Delivery, as to
     such other matters as the Representatives may reasonably request and in
     form and substance satisfactory to the Representatives;

          (h) Since the respective dates as of which information is given in the
     Prospectus, as amended or supplemented, there shall not have been (i) any
     change in the capital stock (other than the Guarantor's purchase of
     treasury stock in connection with its buy back program and the issuance of
     stock upon the exercise of employee stock options, director stock awards,
     bonus stock awards and earn-outs of performance shares) or long-term debt
     in excess of $10 million of the Guarantor or any of its subsidiaries or
     (ii) any change, or any development involving a prospective change, in or
     affecting the general affairs, management, financial position,
     stockholders' equity or results of operations of the Guarantor and its
     subsidiaries, in each case, otherwise than as set forth or contemplated in
     the Prospectus, as amended or supplemented, the effect of which, in any
     such case described in Clause (i) or (ii), is in the judgment of the
     Representatives so material and adverse as to make it impracticable or
     inadvisable to proceed with the offering or the delivery of the Designated
     Securities on the terms and in the manner contemplated in the Prospectus,
     as amended or supplemented;

          (i) On or after the date hereof (i) no downgrading shall have occurred
     in the rating accorded the Guarantor's or the Bank's debt securities or
     preferred stock by any "nationally recognized statistical rating
     organization," as that term is defined by the Commission for purposes of
     Rule 436(g)(2) under the Act, and (ii) no such organization shall have
     publicly announced that it has under surveillance or review, with possible
     negative implications, its rating of any of the Guarantor's or the Bank's
     debt securities or preferred stock;

                                     -28-
<PAGE>
 
          (j) On or after the date hereof, there shall not have occurred any of
     the following: (i) a suspension or material limitation in trading in
     securities generally on the New York Stock Exchange or the Nasdaq Stock
     Market; (ii) a suspension or material limitation in trading in the
     Guarantor's securities on the Nasdaq Stock Market; (iii) a general
     moratorium on commercial banking activities in Illinois or New York
     declared by federal, Illinois or New York State authorities; or (iv) the
     outbreak or escalation of hostilities involving the United States or the
     declaration by the United States of a national emergency or war, if the
     effect of any such event specified in this clause (iv) in the judgment of
     the Representatives makes it impracticable or inadvisable to proceed with
     the offering or the delivery of the Designated Securities on the terms and
     in the manner contemplated by the Prospectus, as amended and supplemented;

          (k) If provided in the applicable Pricing Agreement, the Designated
     Securities to be sold by the Designated Trust at the respective Time of
     Delivery shall have been duly listed, subject to notice of issuance, on the
     Nasdaq Stock Market; and

          (l) The Designated Trust and the Guarantor shall have furnished or
     caused to be furnished to the Representatives at the respective Time of
     Delivery for the Designated Securities certificates of officers of the
     Designated Trust and the Guarantor satisfactory to the Representatives as
     to the accuracy of the representations and warranties of the Designated
     Trust and the Guarantor herein at and as of such Time of Delivery, as to
     the performance by the Designated Trust and the Guarantor of all of their
     obligations hereunder to be performed at or prior to such Time of Delivery,
     as to the matters set forth in subsections (a) and (h) of this Section and
     as to such other matters as the Representatives may reasonably request.

          7. (a) The Designated Trust and the Guarantor jointly and severally
     will indemnify and hold harmless each Underwriter against any losses,
     claims, damages or liabilities, joint or several, to which such Underwriter
     may become subject, under the Act or otherwise, insofar as such losses,
     claims, damages or liabilities (or actions in respect thereof) arise out of
     or are based upon an untrue statement or alleged untrue statement of a
     material fact contained in any

                                     -29-
<PAGE>
 
     Preliminary Prospectus, any preliminary prospectus supplement, the
     Registration Statement, the Prospectus, as amended or supplemented, and any
     other prospectus relating to the Designated Securities, or any amendment or
     supplement thereto, or arise out of or are based upon the omission or
     alleged omission to state therein a material fact required to be stated
     therein or necessary to make the statements therein not misleading, and
     will reimburse each Underwriter for any legal or other expenses reasonably
     incurred by such Underwriter in connection with investigating or defending
     any such action or claim as such expenses are incurred; provided, however,
     that neither the Designated Trust nor the Guarantor shall be liable in any
     such case to the extent that any such loss, claim, damage or liability
     arises out of or is based upon an untrue statement or alleged untrue
     statement or omission or alleged omission made in any Preliminary
     Prospectus, any preliminary prospectus supplement, the Registration
     Statement, the Prospectus, as amended or supplemented, and any other
     prospectus relating to the Designated Securities, or any such amendment or
     supplement in reliance upon and in conformity with written information
     furnished to the Designated Trust or the Guarantor by any Underwriter of
     Designated Securities through the Representatives expressly for use in the
     Prospectus, as amended or supplemented, relating to such Securities.

          (b) Each Underwriter will indemnify and hold harmless the Designated
     Trust and the Guarantor against any losses, claims, damages or liabilities
     to which the Designated Trust or the Guarantor may become subject, under
     the Act or otherwise, insofar as such losses, claims, damages or
     liabilities (or actions in respect thereof) arise out of or are based upon
     an untrue statement or alleged untrue statement of a material fact
     contained in any Preliminary Prospectus, any preliminary prospectus
     supplement, the Registration Statement, the Prospectus, as amended or
     supplemented, and any other prospectus relating to the Securities, or any
     amendment or supplement thereto, or arise out of or are based upon the
     omission or alleged omission to state therein a material fact required to
     be stated therein or necessary to make the statements therein not
     misleading, in each case to the extent, but only to the extent, that such
     untrue statement or alleged untrue statement or omission or alleged
     omission was made in any Preliminary Prospectus, any preliminary prospectus

                                     -30-
<PAGE>
 
     supplement, the Registration Statement, the Prospectus, as amended or
     supplemented, and any other prospectus relating to the Securities, or any
     such amendment or supplement in reliance upon and in conformity with
     written information furnished to the Designated Trust or the Guarantor by
     such Underwriter through the Representatives expressly for use therein; and
     will reimburse the Designated Trust or the Guarantor for any legal or other
     expenses reasonably incurred by the Designated Trust or the Guarantor in
     connection with investigating or defending any such action or claim as such
     expenses are incurred.

          (c) Promptly after receipt by an indemnified party under subsection
     (a) or (b) above of notice of the commencement of any action, such
     indemnified party will, if a claim in respect thereof is to be made against
     the indemnifying party under such subsection, notify the indemnifying party
     in writing of the commencement thereof; but the omission so to notify the
     indemnifying party shall not relieve it from any liability which it may
     have to any indemnified party otherwise than under such subsection. In any
     such proceeding, any indemnified party shall have the right to retain its
     own counsel, but the fees and expenses of such counsel shall be at the
     expense of such indemnified party unless (i) the indemnifying party and the
     indemnified party shall have mutually agreed to the retention of such
     counsel or (ii) the named parties to any such proceeding (including any
     impleaded parties) include both the indemnifying party and the indemnified
     party and representation of both parties by the same counsel would be
     inappropriate due to actual or potential differing interests between them.
     It is understood that the indemnifying party shall not, in connection with
     any proceeding or related proceedings in the same jurisdiction, be liable
     for the reasonable fees and expenses of more than one separate firm for all
     such indemnified parties. Such firm shall be designated in writing by the
     Representatives in the case of parties indemnified pursuant to subsection
     (a) above and by the Guarantor in the case of parties indemnified pursuant
     to subsection (b) above.

          (d) If the indemnification provided for in this Section 7 is
     unavailable to or insufficient to hold harmless an indemnified party under
     subsection (a) or (b) above in respect of any losses, claims, damages or
     liabilities (or actions in respect thereof) referred to

                                     -31-
<PAGE>
 
     therein, then each indemnifying party shall contribute to the amount paid
     or payable by such indemnified party as a result of such losses, claims,
     damages or liabilities (or actions in respect thereof) in such proportion
     as is appropriate to reflect the relative benefits received by the
     Designated Trust and the Guarantor on the one hand and the Underwriters of
     the Designated Securities on the other from the offering of the Designated
     Securities to which such loss, claim, damage or liability (or action in
     respect thereof) relates. If, however, the allocation provided by the
     immediately preceding sentence is not permitted by applicable law or if the
     indemnified party failed to give the notice required under subsection (c)
     above, then each indemnifying party shall contribute to such amount paid or
     payable by such indemnified party in such proportion as is appropriate to
     reflect not only such relative benefits but also the relative fault of the
     Designated Trust and the Guarantor on the one hand and the Underwriters of
     the Designated Securities on the other in connection with the statements or
     omissions which resulted in such losses, claims, damages or liabilities (or
     actions in respect thereof), as well as any other relevant equitable
     considerations. The relative benefits received by the Designated Trust and
     the Guarantor on the one hand and such Underwriters on the other shall be
     deemed to be in the same proportion as the total net proceeds from such
     offering (before deducting expenses) received by the Designated Trust bear
     to the total compensation (before deducting expenses) received or realized
     by the Underwriters from the underwriting of the Designated Securities. The
     relative fault shall be determined by reference to, among other things,
     whether the untrue or alleged untrue statement of a material fact or the
     omission or alleged omission to state a material fact relates to
     information supplied by the Designated Trust and the Guarantor on the one
     hand or such Underwriters on the other and the parties' relative intent,
     knowledge, access to information and opportunity to correct or prevent such
     statement or omission. The Designated Trust, the Guarantor and the
     Underwriters agree that it would not be just and equitable if contribution
     pursuant to this subsection (d) were determined by pro rata allocation or
     by any other method of allocation (even if the Underwriters were treated as
     one entity for such purpose) which does not take account of the equitable
     considerations referred to above in this subsection (d). The amount paid or
     payable by an

                                     -32-
<PAGE>
 
     indemnified party as a result of the losses, claims, damages or liabilities
     (or actions in respect thereof) referred to above in this subsection (d)
     shall be deemed to include any legal or other expenses reasonably incurred
     by such indemnified party in connection with investigating or defending any
     such action or claim. Notwithstanding the provisions of this subsection
     (d), no Underwriter shall be required to contribute any amount in excess of
     the amount by which the total price at which the applicable Designated
     Securities underwritten by it and distributed to the public were offered to
     the public exceeds the amount of any damages which such Underwriter has
     otherwise been required to pay by reason of such untrue or alleged untrue
     statement or omission or alleged omission. No person guilty of fraudulent
     misrepresentation (within the meaning of Section 11(f) of the Act) shall be
     entitled to contribution from any person who was not guilty of such
     fraudulent misrepresentation. The obligations of the Underwriters of
     Designated Securities in this subsection (d) to contribute are several in
     proportion to their respective underwriting obligations with respect to
     such Securities and not joint. For purposes of this Section 7, each person
     who controls an Underwriter within the meaning of the Act shall have the
     same rights to contribution as such Underwriter, and each person who
     controls the Guarantor or the Designated Trust within the meaning of the
     Act, and each director of the Guarantor and each administrative trustee of
     the Designated Trust, shall have the same rights to contribution as the
     Guarantor and the Designated Trust, subject in each case to the limitation
     described in the preceding sentence.

          (e) The obligations of the Designated Trust and the Guarantor under
     this Section 7 shall be in addition to any liability which the Designated
     Trust and the Guarantor may otherwise have and shall extend, upon the same
     terms and conditions, to each person, if any, who controls any Underwriter
     within the meaning of the Act; and the obligations of the Underwriters
     under this Section 7 shall be in addition to any liability which the
     respective Underwriters may otherwise have and shall extend, upon the same
     terms and conditions, to each officer and director of the Guarantor, to
     each administrative trustee of the Designated Trust and to each person, if
     any, who controls the Designated Trust or the Guarantor within the meaning
     of the Act.

                                     -33-
<PAGE>
 
          8.(a) If any Underwriter shall default in its obligation to purchase
     the Firm Designated Securities or the Optional Designated Securities which
     it has agreed to purchase under the Pricing Agreement relating to such
     Designated Securities, the Representatives may in their discretion arrange
     for themselves or another party or other parties to purchase such
     Designated Securities on the terms contained herein and in such Pricing
     Agreement. If within thirty-six hours after such default by any Underwriter
     the Representatives do not arrange for the purchase of such Firm Designated
     Securities or such Optional Designated Securities, as the case may be, then
     the Designated Trust and the Guarantor shall be entitled to a further
     period of thirty-six hours within which to procure another party or other
     parties satisfactory to the Representatives to purchase such Designated
     Securities on such terms. In the event that, within the respective
     prescribed period, the Representatives notify the Designated Trust and the
     Guarantor that they have so arranged for the purchase of such Designated
     Securities, or the Designated Trust and the Guarantor notifies the
     Representatives that they have so arranged for the purchase of such
     Designated Securities, the Representatives or the Designated Trust and the
     Guarantor shall have the right to postpone the Time of Delivery for such
     Designated Securities for a period of not more than seven days, in order to
     effect whatever changes may thereby be made necessary in the Registration
     Statement or the Prospectus, as amended or supplemented, or in any other
     documents or arrangements, and the Designated Trust and the Guarantor agree
     to file promptly any amendments or supplements to the Registration
     Statement or the Prospectus which in the opinion of the Representatives may
     thereby be made necessary. The term "Underwriter" as used in this Agreement
     shall include any person substituted under this Section with like effect as
     if such person had originally been a party to the Pricing Agreement with
     respect to such Designated Securities.
 
          (b) If, after giving effect to any arrangements for the purchase of
     the Firm Designated Securities or Optional Designated Securities, as the
     case may be, of a defaulting Underwriter or Underwriters by the
     Representatives and the Designated Trust and the Guarantor as provided in
     subsection (a) above, the

                                     -34-
<PAGE>
 
     aggregate number of such Designated Securities which remains unpurchased
     does not exceed one-eleventh of the aggregate number of the Firm Designated
     Securities or Optional Designated Securities, as the case may be, to be
     purchased at the respective Time of Delivery, then the Designated Trust and
     the Guarantor shall have the right to require each non-defaulting
     Underwriter to purchase the number of Firm Designated Securities or
     Optional Designated Securities, as the case may be, which such Underwriter
     agreed to purchase under the Pricing Agreement relating to such Designated
     Securities and, in addition, to require each non-defaulting Underwriter to
     purchase its pro rata share (based on the number of Firm Designated
     Securities or Optional Designated Securities, as the case may be, which
     such Underwriter agreed to purchase under such Pricing Agreement) of the
     Firm Designated Securities or Optional Designated Securities, as the case
     may be, of such defaulting Underwriter or Underwriters for which such
     arrangements have not been made; but nothing herein shall relieve a
     defaulting Underwriter from liability for its default.

          (c) If, after giving effect to any arrangements for the purchase of
     the Firm Designated Securities or Optional Designated Securities, as the
     case may be, of a defaulting Underwriter or Underwriters by the
     Representatives and the Designated Trust and the Guarantor as provided in
     subsection (a) above, the aggregate number of Firm Designated Securities or
     Optional Designated Securities, as the case may be, which remains
     unpurchased exceeds one-eleventh of the aggregate number of the Firm
     Designated Securities or Optional Designated Securities, as the case may
     be, to be purchased at the respective Time of Delivery, as referred to in
     subsection (b) above, or if the Designated Trust and the Guarantor shall
     not exercise the right described in subsection (b) above to require non-
     defaulting Underwriters to purchase Firm Designated Securities or Optional
     Designated Securities, as the case may be, of a defaulting Underwriter or
     Underwriters, then the Pricing Agreement relating to such Firm Designated
     Securities or Optional Designated Securities, as the case may be, shall
     thereupon terminate, without liability on the part of any non-defaulting
     Underwriter, the Designated Trust or the Guarantor, except for the expenses
     to be borne by the Designated Trust, the Guarantor and the Underwriters as
     provided in Section 5 hereof and the indemnity and

                                     -35-
<PAGE>
 
     contribution agreements in Section 7 hereof; but nothing herein shall
     relieve a defaulting Underwriter from liability for its default.

     9.   The respective indemnities, agreements, representations, warranties
and other statements of the Designated Trust, the Guarantor and the several
Underwriters, as set forth in this Agreement or made by or on behalf of them,
respectively, pursuant to this Agreement, shall remain in full force and effect,
regardless of any investigation (or any statement as to the results thereof)
made by or on behalf of any Underwriter or any controlling person of any
Underwriter, or the Designated Trust, the Guarantor, or any officer or director
or controlling person of the Designated Trust or the Guarantor, and shall
survive delivery of and payment for the Designated Securities.

     10.  If any Pricing Agreement or Over-allotment Option shall be terminated
pursuant to Section 8 hereof, neither the Designated Trust nor the Guarantor
shall then be under any liability to any Underwriter with respect to the Firm
Designated Securities or Optional Designated Securities covered by such Pricing
Agreement except as provided in Section 5 and Section 7 hereof; but, if for any
other reason, Designated Securities are not delivered by or on behalf of the
Designated Trust as provided herein, the Designated Trust and the Guarantor will
reimburse the Underwriters through the Representatives for all out-of-pocket
expenses approved in writing by the Representatives, including fees and
disbursements of counsel, reasonably incurred by the Underwriters in making
preparations for the purchase, sale and delivery of such Designated Securities,
but the Designated Trust and the Guarantor shall then be under no further
liability to any Underwriter with respect to such Designated Securities except
as provided in Section 5 and Section 7 hereof.

     11.  In all dealings hereunder, the Representatives of the Underwriters of
Designated Securities shall act on behalf of each of such Underwriters, and the
parties hereto shall be entitled to act and rely upon any statement, request,
notice or agreement on behalf of any Underwriter made or given by such
Representatives jointly or by such of the Representatives, if any, as may be
designated for such purpose in the Pricing Agreement.

     All statements, requests, notices and agreements hereunder shall be in
writing, and if to the Underwriters shall be delivered or sent by mail, telex or
facsimile

                                     -36-
<PAGE>
 
transmission to the address of the Representatives as set forth in the Pricing
Agreement; and if to the Designated Trust or the Guarantor shall be delivered or
sent by mail, telex or facsimile transmission to the address of the Designated
Trust or the Guarantor set forth in the Registration Statement: Attention:
Corporate Secretary, with a copy to Northern Trust Corporation, Fifty South
LaSalle Street, Chicago, Illinois 60675, Attention: General Counsel, Facsimile
Transmission No. (312) 630-1596; provided, however, that any notice to an
Underwriter pursuant to Section 7(c) hereof shall be delivered or sent by mail,
telex or facsimile transmission to such Underwriter at its address set forth in
its Underwriters' Questionnaire, or telex constituting such Questionnaire, which
address will be supplied to the Designated Trust and the Guarantor by the
Representatives upon request. Any such statements, requests, notices or
agreements shall take effect upon receipt thereof.

     12. This Agreement and each Pricing Agreement shall be binding upon, and
inure solely to the benefit of, the Underwriters, the Designated Trust and the
Guarantor and, to the extent provided in Section 7 and Section 9 hereof, the
officers and directors of the Designated Trust or the Guarantor and each person
who controls the Designated Trust, the Guarantor or any Underwriter, and their
respective heirs, executors, administrators, successors and assigns, and no
other person shall acquire or have any right under or by virtue of this
Agreement or any such Pricing Agreement. No purchaser of any of the Designated
Securities from any Underwriter shall be deemed a successor or assign by reason
merely of such purchase.

     13. Time shall be of the essence of each Pricing Agreement. As used herein,
"business day" shall mean any day when the Commission's office in Washington,
D.C. is open for business.

     14. THIS AGREEMENT AND EACH PRICING AGREEMENT SHALL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.
 
     15.  This Agreement and each Pricing Agreement may be executed by any one
or more of the parties hereto and thereto in any number of counterparts, each of
which shall be deemed to be an original, but all such respective counterparts
shall together constitute one and the same instrument.

                                     -37-
<PAGE>
 
     If the foregoing is in accordance with your understanding, please sign and
return to us six counterparts hereof.

                                        Very truly yours,

                                        NORTHERN TRUST CORPORATION


                                        By: /s/ Perry R. Pero
                                            ----------------------------
                                            Name: Perry R. Pero
                                            Title: Senior Executive Vice
                                                   President and Chief
                                                   Financial Officer

                                        NTC CAPITAL I
                                        By:  Northern Trust Corporation, 
                                               as Depositor


                                        By: /s/ Perry R. Pero
                                            ----------------------------
                                            Name: Perry R. Pero
                                            Title: Senior Executive Vice
                                                   President and Chief
                                                   Financial Officer

                                        NTC CAPITAL II
                                        By:  Northern Trust Corporation,
                                               as Depositor


                                        By: /s/ Perry R. Pero
                                            ----------------------------
                                            Name: Perry R. Pero
                                            Title: Senior Executive Vice
                                                   President and Chief
                                                   Financial Officer

                                        NTC CAPITAL III
                                        By:  Northern Trust Corporation,
                                               as Depositor


                                        By: /s/ Perry R. Pero
                                            ----------------------------
                                            Name: Perry R. Pero
                                            Title: Senior Executive Vice
                                                   President and Chief
                                                   Financial Officer

                                     -38-
<PAGE>
 
Accepted on behalf of ourselves and the other Underwriters listed in Schedule I
to the Pricing Agreement:

Goldman, Sachs & Co.
Salomon Brothers Inc


By:   /s/ Goldman, Sachs & Co.
     -----------------------------
       (Goldman, Sachs & Co.)

                                     -39-
<PAGE>
 
                                                                         ANNEX I


                              Pricing Agreement
                              -----------------


Goldman, Sachs & Co.,
Salomon Brothers Inc,
   As Representatives of the several
      Underwriters named in Schedule I hereto,
c/o Goldman, Sachs & Co.,
85 Broad Street,
New York, New York 10004.

                                                              _________ __, ____

Dear Sirs:

          NTC Capital ___, a statutory business trust created under the laws of
the State of Delaware (the "Designated Trust"), and Northern Trust Corporation,
a Delaware corporation (the "Guarantor"), propose, subject to the terms and
conditions stated herein and in the Underwriting Agreement, dated January 9,
1997 (the "Underwriting Agreement"), among the Guarantor and the Designated
Trust on the one hand and the Underwriters named in Schedule I to the
Underwriting Agreement, on the other hand, to issue and sell to the Underwriters
named in Schedule I hereto (the "Underwriters") the Securities specified in
Schedule II hereto (the "Designated Securities", consisting of Firm Designated
Securities and any Optional Designated Securities the Underwriters may elect to
purchase).  Each of the provisions of the Underwriting Agreement is incorporated
herein by reference in its entirety, and shall be deemed to be a part of this
Agreement to the same extent as if such provisions had been set forth in full
herein; and each of the representations and warranties set forth therein shall
be deemed to have been made at and as of the date of this Pricing Agreement,
except that each representation and warranty which refers to the Prospectus in
Section 2 of the Underwriting Agreement shall be deemed to be a representation
or warranty as of the date of the Underwriting Agreement in relation to the
Prospectus (as therein defined), and also a representation and warranty as of
the date of this Pricing Agreement in relation to the Prospectus, as amended or
supplemented, relating to the Designated Securities which are the subject of
this Pricing Agreement.  Each reference to the 

                                      -40-

<PAGE>
 
Representatives herein and in the provisions of the Underwriting Agreement so
incorporated by reference shall be deemed to refer to you. Unless otherwise
defined herein, terms defined in the Underwriting Agreement are used herein as
therein defined. The Representatives designated to act on behalf of the
Representatives and on behalf of each of the Underwriters of the Designated
Securities pursuant to Section 11 of the Underwriting Agreement and the address
of the Representatives referred to in such Section 11 are set forth at the end
of Schedule II hereto.

          An amendment to the Registration Statement, or a supplement to the
Prospectus, as the case may be, relating to the Designated Securities, in the
form heretofore delivered to you is now proposed to be filed with the
Commission.

          Subject to the terms and conditions set forth herein and in the
Underwriting Agreement incorporated herein by reference, (a) the Designated
Trust agrees to issue and sell to each of the Underwriters, and each of the
Underwriters agrees, severally and not jointly, to purchase from the Designated
Trust, at the time and place and at the purchase price to the Underwriters set
forth in Schedule II hereto, the number of Firm Designated Securities set forth
opposite the name of such Underwriter in Schedule  I hereto, and (b) in the
event and to the extent that the Underwriters shall exercise the election to
purchase Optional Designated Securities, as provided below, the Designated Trust
agrees to issue and sell to each of the Underwriters, and each of the
Underwriters agrees, severally and not jointly, to purchase from the Designated
Trust at the purchase price to the Underwriters set out in Schedule II hereto
that portion of the number of Optional Designated Securities as to which such
election shall have been exercised.

          The Designated Trust hereby grants to each of the Underwriters the
right to purchase at their election up to the number of Optional Designated
Securities set forth opposite the name of such Underwriter in Schedule I hereto
on the terms referred to in the paragraph above for the sole purpose of covering
over-allotments in the sale of the Firm Designated Securities.  Any such
election to purchase Optional Designated Securities may be exercised by written
notice from the Representatives to the Designated Trust and the Guarantor given
within a period of 30 calendar days after the date of this Pricing Agreement,
setting forth the aggregate number of Optional Designated Securities to be
purchased and the date on which such Optional Designated 

                                      -41-
<PAGE>
 
Securities are to be delivered, as determined by the Representatives, but in no
event earlier than the First Time of Delivery or, unless the Representatives,
the Guarantor and the Designated Trust otherwise agree in writing, no earlier
than two or later than ten business days after the date of such notice.

          If the foregoing is in accordance with your understanding, please sign
and return to us six counterparts hereof, and upon acceptance hereof by you, on
behalf of each of the Underwriters, this letter and such acceptance hereof,
including the provisions of the Underwriting Agreement incorporated herein by
reference, shall constitute a binding agreement between each of the
Underwriters, the Designated Trust and the Guarantor.  It is understood that
your acceptance of this letter on behalf of each of the Underwriters is or will
be pursuant to the authority set forth in a form of Agreement among
Underwriters, the form of which shall be submitted to the Guarantor for
examination upon request, but without warranty on the part of the
Representatives as to the authority of the signers thereof.

                         Very truly yours,

                         NORTHERN TRUST CORPORATION


                         By:_________________________
                             Name:
                             Title:

 

                         NTC CAPITAL _____
                         By: Northern Trust Corporation,
                              as Depositor


                         By:_________________________
                             Name:
                             Title:

                                      -42-

<PAGE>
 
Accepted as of the date hereof:


Goldman, Sachs & Co.
Salomon Brothers Inc

As Representatives of the Underwriters
named in Schedule I hereto

___________________________________


On behalf of each of the Underwriters
named on Schedule I hereto

                                      -43-

<PAGE>
 
SCHEDULE I

                                                Number of
                                                 Maximum
                            Number of Firm       Optional
                             Designated         Designated
                           Securities to be   Securities to
Underwriter                   Purchased       be Purchased
- -----------                ----------------   -------------


[Names of 
Underwriters] ...

Total




                            ------------       ------------

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

                                      -44-
<PAGE>
 
                                  SCHEDULE II
                                        
DESIGNATED TRUST:

     NTC Capital __

TITLE OF DESIGNATED SECURITIES:

     ____% Preferred Securities, Series ___

AGGREGATE PRINCIPAL AMOUNT:

     Aggregate principal amount of Firm Designated Securities:
     $_________________________

     Maximum aggregate principal amount of Optional Designated Securities:
     $_________________________

PRICE TO PUBLIC

     ______% of the principal amount of the Designated Securities

PURCHASE PRICE BY UNDERWRITERS:

     ______% of the principal amount of the Designated Securities

UNDERWRITERS' COMPENSATION:

     $_____ per Designated Security

SPECIFIED FUNDS FOR PAYMENT OF PURCHASE PRICE:

     New York Clearing House same-day funds

ACCOUNTANTS' LETTER TO BE DELIVERED ON DATE OF PRICING AGREEMENT:

     Yes.

TRUST AGREEMENT:

     Amended and Restated Trust Agreement dated __________________, between the
     Guarantor and the Trustees named therein

                                      -45-

<PAGE>
 
INDENTURE:

     Junior Subordinated Indenture dated as of January 1, 1997, between the
     Guarantor and The First National Bank of Chicago, as Debenture Trustee (the
     "Indenture")

GUARANTEE:

     Guarantee Agreement, dated as of _________________, between Guarantor and
     Guarantee Trustee

MATURITY:



INTEREST RATE:

     _____%

INTEREST PAYMENT DATES:



EXTENSION PERIOD:

     [20 quarters]

REDEMPTION PROVISIONS:

     [The redemption provisions set forth in Section 4.2 of the Trust Agreement
     shall apply to the Designated Securities.]

SINKING FUND PROVISIONS:

     No sinking fund provisions.

[FIRST] TIME OF DELIVERY:

     10:00 a.m., New York City time _______ ___, ____

CLOSING LOCATION:

     Sullivan & Cromwell
     125 Broad Street
     New York, New York  10004

                                      -46-

<PAGE>
 
NAMES AND ADDRESSES OF REPRESENTATIVES:

                                      -47-

<PAGE>
 
                                                                        ANNEX II


                              Accountants' Letter
                              -------------------
                                        

          Pursuant to Section 6(g) of the Underwriting Agreement, the
Guarantor's independent certified public accountants shall furnish letters to
the effect that:

          (i) they are independent certified public accountants with respect to
     the Guarantor and its subsidiaries within the meaning of the Act and the
     applicable published rules and regulations thereunder;

          (ii) in their opinion, the financial statements and any supplementary
     financial information and schedules (and, if applicable, prospective
     financial statements and/or pro forma financial information) examined by
     them and included or incorporated by reference in the Registration
     Statement or the Prospectus comply as to form in all material respects with
     the applicable accounting requirements of the Act or the Exchange Act, as
     applicable, and the related published rules and regulations thereunder;
     and, if reasonably requested by the Representatives, they have made a
     review in accordance with standards established by the American Institute
     of Certified Public Accountants of the unaudited consolidated interim
     financial statements, selected financial data, pro forma financial
     information, prospective financial statements and/or condensed financial
     statements derived from audited financial statements of the Guarantor for
     the periods specified in such letter, as indicated in their reports
     thereon, copies of which have been furnished to the representatives of the
     Underwriters (the "Representatives");

          (iii) they have made a review in accordance with standards established
     by the American Institute of Certified Public Accountants of the unaudited
     condensed consolidated statements of income, consolidated balance sheets
     and consolidated statements of cash flows included in the Prospectus and/or
     included in the Guarantor's quarterly reports on Form 10-Q incorporated by
     reference into the Prospectus as indicated in their reports thereon copies
     of which have been separately furnished to the Representatives; and on the
     basis of 

                                      -48-

<PAGE>
 
     specified procedures including inquiries of officials of the Guarantor who
     have responsibility for financial and accounting matters regarding whether
     the unaudited condensed consolidated financial statements referred to in
     paragraph (v)(A) below comply as to form in all material respects with the
     applicable accounting requirements of the Act and the Exchange Act and the
     related published rules and regulations, nothing came to their attention
     that caused them to believe that the unaudited condensed consolidated
     financial statements do not comply as to form in all material respects with
     the applicable accounting requirements of the Act and the Exchange Act and
     the related published rules and regulations;

          (iv) the unaudited selected financial information with respect to the
     consolidated results of operations and financial position of the Guarantor
     for the five most recent fiscal years included in the Prospectus and
     included or incorporated by reference in Item 2 of the Guarantor's
     Registration Statement on Form 10 or Item 6 of the Guarantor's Annual
     Report on Form 10-K for the most recent fiscal year, as applicable, agrees
     with the corresponding amounts (after restatement where applicable) in the
     audited consolidated financial statements for the five such fiscal years
     which were included or incorporated by reference in the Guarantor's
     Registration Statement on Form 10 or the Guarantor's Annual Reports on Form
     10-K for such fiscal years, as applicable;

          (v) on the basis of limited procedures, not constituting an
     examination in accordance with generally accepted auditing standards,
     consisting of a reading of the unaudited financial statements and other
     information referred to below, a reading of the latest available interim
     financial statements of the Guarantor and its subsidiaries, inspection of
     the minute books of the Guarantor and its subsidiaries since the date of
     the latest audited financial statements included or incorporated by
     reference in the Prospectus, inquiries of officials of the Guarantor and
     its subsidiaries responsible for financial accounting matters and such
     other inquiries and procedures as may be specified in such letter, nothing
     came to their attention that caused them to believe that:

               (A) the unaudited condensed consolidated statements of income,
          consolidated balance sheets 

                                      -49-
<PAGE>
 
          and consolidated statements of cash flows included or incorporated by
          reference in the Guarantor's Quarterly Reports on Form 10-Q
          incorporated by reference in the Prospectus (if any) do not comply as
          to form in all material respects with the applicable accounting
          requirements of the Exchange Act as it applies to Form 10-Q and the
          related published rules and regulations thereunder or are not in
          conformity with generally accepted accounting principles applied on a
          basis substantially consistent with the basis for the audited
          consolidated statements of income, consolidated balance sheets and
          consolidated statements of cash flows included or incorporated by
          reference in the Guarantor's Registration Statement on Form 10 or the
          Guarantor's Annual Report on Form 10-K for the most recent fiscal
          year, as applicable;

               (B) any other unaudited income statement data and balance sheet
          items included in the Prospectus do not agree with the corresponding
          items in the unaudited consolidated financial statements from which
          such data and items were derived, and any such unaudited data and
          items were not determined on a basis substantially consistent with the
          basis for the corresponding amounts in the audited consolidated
          financial statements included or incorporated by reference in the
          Guarantor's Registration Statement on Form 10 or the Guarantor's
          Annual Report on Form 10-K for the most recent fiscal year, as
          applicable;
 
               (C) the unaudited financial statements which were not included in
          the Prospectus but from which were derived the unaudited condensed
          financial statements referred to in Clause (A) and any unaudited
          income statement data and balance sheet items included in the
          Prospectus and referred to in Clause (B) were not determined on a
          basis substantially consistent with the basis for the audited
          financial statements included or incorporated by reference in the
          Guarantor's Registration Statement on Form 10 or the Guarantor's
          Annual Report on Form 10-K for the most recent fiscal year, as
          applicable;
 
               (D) any unaudited pro forma consolidated condensed financial
          statements included or 

                                      -50-
<PAGE>
 
          incorporated by reference in the Prospectus do not comply as to form
          in all material respects with the applicable accounting requirements
          of the Act and the published rules and regulations thereunder or the
          pro forma adjustments have not been properly applied to the historical
          amounts in the compilation of those statements;
 
               (E) as of a specified date not more than five days prior to the
          date of such letter, there have been any changes in the consolidated
          capital stock (other than the Guarantor's purchase of treasury stock
          in connection with its buy back program and the issuance of stock upon
          the exercise of employee stock options, director stock awards, bonus
          stock awards and earn-outs of performance shares) or any increase in
          the consolidated long-term debt of the Guarantor and its subsidiaries
          or any decreases in total assets, in each case as compared with
          amounts shown in the latest balance sheet included or incorporated by
          reference in the Prospectus, except in each case for changes,
          increases or decreases which the Prospectus discloses have occurred or
          may occur or which are described in such letter; and
 
               (F) for the period from the date of the latest financial
          statements included or incorporated by reference in the Prospectus to
          the specified date referred to in Clause (E) there were any decreases
          in consolidated net interest income, non-interest income or the total
          or per share amounts of consolidated net income, in each case as
          compared with the comparable period of the preceding year and with any
          other period of corresponding length specified by the Representatives,
          except in each case for increases or decreases which the Prospectus
          discloses have occurred or may occur or which are described in such
          letter; and

          (vi) in addition to the examination referred to in their report(s)
     included or incorporated by reference in the Prospectus and the limited
     procedures, inspection of minute books, inquiries and other procedures
     referred to in paragraphs (iii) and (v) above, they have carried out
     certain specified procedures, not constituting an examination in accordance
     with generally accepted auditing standards, 

                                      -51-
<PAGE>
 
     with respect to certain amounts, percentages and financial information
     specified by the Representatives which are derived from the general
     accounting records of the Guarantor and its subsidiaries, which appear in
     the Prospectus (excluding documents incorporated by reference), or in Part
     II of, or in exhibits and schedules to, the Registration Statement
     specified by the Representatives or in documents incorporated by reference
     in the Prospectus specified by the Representatives, and have compared
     certain of such amounts, percentages and financial information with the
     accounting records of the Guarantor and its subsidiaries and have found
     them to be in agreement.
 
          All references in this Annex II to the Prospectus shall be deemed to
refer to the Prospectus (including the documents incorporated by reference
therein) as defined in the Underwriting Agreement as of the date of the letter
delivered on the date of the Pricing Agreement, if so delivered, for purposes of
such letter and to the Prospectus, as amended or supplemented, (including the
documents incorporated by reference therein) in relation to the applicable
Designated Securities for purposes of the letter delivered at the Time of
Delivery for such Designated Securities.

                                      -52-

<PAGE>
 
                                                                [Execution Copy]

- --------------------------------------------------------------------------------



                          NORTHERN TRUST CORPORATION



                                      to



                      THE FIRST NATIONAL BANK OF CHICAGO,
                                  as Trustee

                            ----------------------

                         JUNIOR SUBORDINATED INDENTURE


                          Dated as of January 1, 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 1, 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)
          (e)................................................. 5.14
(S) 316   (a)................................................. 1.1
          (a)(1)(A)........................................... 5.12
          (a)(1)(B)........................................... 5.13
</TABLE>
<PAGE>
 
<TABLE>
<CAPTION>

<S>       <C>                                                  <C>

          (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
                                                                            Page



                                   ARTICLE I

            Definitions and Other Provisions of General Application
<TABLE>
<CAPTION>

<S>                                                                          <C>
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................................................ 11
Section 1.5.  Notices, Etc. to Trustee and Corporation....................... 13
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......................................... 14
Section 1.10. Separability Clause............................................ 14
Section 1.11. Benefits of Indenture.......................................... 14
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.............. 21
Section 2.5.  Form of Trustee's Certificate of Authentication................ 21


                                  ARTICLE III

                                The Securities

Section 3.1.  Title and Terms................................................ 22
Section 3.2.  Denominations.................................................. 25
Section 3.3.  Execution, Authentication, Delivery and Dating................. 25
Section 3.4.  Temporary Securities........................................... 26
Section 3.5.  Global Securities.............................................. 26
Section 3.6.  Registration, Transfer and Exchange Generally.................. 28
Section 3.7.  Mutilated, Destroyed, Lost and Stolen Securities............... 29
Section 3.8.  Payment of Interest and Additional Interest; Interest Rights
                Preserved.................................................... 29
Section 3.9.  Persons Deemed Owners.......................................... 31
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............................................... 33
Section 3.14. Agreed Tax Treatment........................................... 33
</TABLE>

                                      -i-
<PAGE>

<TABLE>
<CAPTION>
                                                                            Page
<S>                                                                         <C>
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........................ 34
Section 4.2.  Application of Trust Money..................................... 35



                                   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............................... 38
Section 5.5.  Trustee May Enforce Claim Without Possession of Securities..... 39
Section 5.6.  Application of Money Collected................................. 39
Section 5.7.  Limitation on Suits............................................ 39
Section 5.8.  Unconditional Right of Holders to Receive Principal, Premium
                and 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................................. 41
Section 5.11. Delay or Omission Not Waiver................................... 41
Section 5.12. Control by Holders............................................. 41
Section 5.13. Waiver of Past Defaults........................................ 42
Section 5.14. Undertaking for Costs.......................................... 42
Section 5.15. Waiver of Usury, Stay or Extension Laws........................ 42


                                  ARTICLE VI

                                  The Trustee

Section 6.1.  Certain Duties and Responsibilities............................ 43
Section 6.2.  Notice of Defaults............................................. 44
Section 6.3.  Certain Rights of Trustee...................................... 44
Section 6.4.  Not Responsible for Recitals or Issuance of Securities......... 45
Section 6.5.  May Hold Securities............................................ 45
Section 6.6.  Money Held in Trust............................................ 45
Section 6.7.  Compensation and Reimbursement................................. 46
Section 6.8.  Disqualification; Conflicting Interests........................ 46
Section 6.9.  Corporate Trustee Required; Eligibility........................ 46
Section 6.10. Resignation and Removal; Appointment of Successor.............. 47
Section 6.11. Acceptance of Appointment by Successor......................... 48
</TABLE>

                                     -ii-
<PAGE>

<TABLE>
<CAPTION>
                                                                            Page
<S>                                                                         <C>
Section 6.12. Merger, Conversion, Consolidation or Succession to Business.... 49
Section 6.13. Preferential Collection of Claims Against Corporation.......... 50
Section 6.14. Appointment of Authenticating Agent............................ 50


                                  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......... 52
Section 7.3.  Reports by Trustee............................................. 52
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....... 53
Section 8.2.  Successor Corporation Substituted.............................. 53



                                  ARTICLE IX

                            Supplemental Indentures

Section 9.1.  Supplemental Indentures without Consent of Holders............. 54
Section 9.2.  Supplemental Indentures with Consent of Holders................ 55
Section 9.3.  Execution of Supplemental Indentures........................... 56
Section 9.4.  Effect of Supplemental Indentures.............................. 56
Section 9.5.  Conformity with Trust Indenture Act............................ 57
Section 9.6.  Reference in Securities to Supplemental Indentures............. 57


                                   ARTICLE X

                                   Covenants

Section 10.1. Payment of Principal, Premium and Interest..................... 57
Section 10.2. Maintenance of Office or Agency................................ 57
Section 10.3. Money for Security Payments to be Held in Trust................ 58
Section 10.4. Statement as to Compliance..................................... 59
Section 10.5. Waiver of Certain Covenants.................................... 59
Section 10.6. Additional Sums................................................ 60
Section 10.7. Additional Covenants........................................... 60
Section 10.8. Original Issue Discount........................................ 61
</TABLE>

                                     -iii-
<PAGE>

<TABLE>
<CAPTION>
                                                                             Page

                                  ARTICLE XI

                           Redemption of Securities


<S>                                                                            <C>
Section 11.1   Applicability of This Article.................................. 61
Section 11.2.  Election to Redeem; Notice to Trustee.......................... 62
Section 11.3.  Selection of Securities to be Redeemed......................... 62
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........................................................ 64


                                  ARTICLE XII

                                 Sinking Funds

Section 12.1.  Applicability of Article....................................... 64
Section 12.2.  Satisfaction of Sinking Fund Payments with Securities.......... 65
Section 12.3.  Redemption of Securities for Sinking Fund...................... 65


                                 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............................ 67
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.................... 69
Section 13.6.  Trustee to Effectuate Subordination............................ 69
Section 13.7.  No Waiver of Subordination Provisions.......................... 69
Section 13.8.  Notice to Trustee.............................................. 70
Section 13.9.  Reliance on Judicial Order or Certificate of Liquidating Agent. 70
Section 13.10. Trustee Not Fiduciary for Holders of Senior Indebtedness....... 71
Section 13.11. Rights of Trustee as Holder of Senior Indebtedness;
                 Preservation of Trustee's Rights............................. 71
Section 13.12. Article Applicable to Paying Agents............................ 71
</TABLE>

                                     -iv-
<PAGE>
 
     JUNIOR SUBORDINATED INDENTURE, dated as of January 1, 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 them in accordance with generally accepted accounting
     principles;

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

     "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

                                      -2-
<PAGE>
 
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.

     "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

                                      -3-
<PAGE>
 
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.

     "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.

                                      -4-
<PAGE>
 
     "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.

     "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

                                      -5-
<PAGE>
 
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 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.

                                      -6-
<PAGE>
 
     "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.

     "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 The
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 (f) 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

                                      -7-
<PAGE>
 
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 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

                                      -8-
<PAGE>
 
"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 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.

                                      -9-
<PAGE>
 
     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 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.

                                     -10-
<PAGE>
 
     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 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
office specified in the first paragraph of this instrument or at any other
address previously furnished in writing to the Trustee by the Corporation.

                                     -11-
<PAGE>
 
     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.

     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

                                     -12-
<PAGE>
 
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 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.

                                     -13-
<PAGE>
 
     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 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

                                     -14-
<PAGE>
 
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 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 date interest on this Security
would have been payable except for the election to begin such Extension Period
and (ii) the date on which the Administrative Trustees of such Issuer Trust are
required to give notice to any securities exchange or other applicable self-
regulatory organization on which the Preferred Securities are then listed or
quoted or to holders of such 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].

     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--;

                                     -15-
<PAGE>
 
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 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 1, 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

                                     -16-
<PAGE>
 
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 percentages of the
principal amount hereof): If redeemed during the 12-month period beginning
_____________. 
 

                                        Redemption
                       Year                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

                                     -17-
<PAGE>
 
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 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

                                     -18-
<PAGE>
 
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 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


     ARTICLE III

                                     -19-
<PAGE>
 
                                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, or method of calculating the rate or
     rates, if any, at which the Securities of such series shall bear interest,
     if any, the rate or rates, or method of calculating the rate or rates at
     which 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 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

                                     -20-
<PAGE>
 
     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 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;

                                     -21-
<PAGE>
 
          (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.

     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.

                                     -22-
<PAGE>
 
     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 bility 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' 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
cancellation 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.

                                     -23-
<PAGE>
 
     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 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

                                     -24-
<PAGE>
 
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 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

                                     -25-
<PAGE>
 
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 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.

                                     -26-
<PAGE>
 
     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 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 

                                     -27-
<PAGE>
 
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.

     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 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

                                     -28-
<PAGE>
 
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 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

                                     -29-
<PAGE>
 
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 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

                                     -30-
<PAGE>
 
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

     (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.

                                     -31-
<PAGE>
 
     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

     (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

                                     -32-
<PAGE>
 
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 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.

                                     -33-
<PAGE>
 
     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. 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

                                      -34-
<PAGE>
 
               (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.

     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

                                      -35-
<PAGE>
 
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;

     (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.

                                      -36-
<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:

     (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

                                      -37-
<PAGE>
 
     (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.


     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 

                                      -38-
<PAGE>
 
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 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:

                                     -39-
<PAGE>
 
     (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 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.

                                     -40-
<PAGE>
 
     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 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

                                     -41-
<PAGE>
 
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 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

                                     -42-
<PAGE>
 
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 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, 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

                                     -43-
<PAGE>
 
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 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.

                                     -44-
<PAGE>
 
     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:

     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

                                     -45-
<PAGE>
 
             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 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, 

                                     -46-
<PAGE>
 
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 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 

                                     -47-
<PAGE>
 
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.

     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

                                     -48-
<PAGE>
 
          (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

          (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 change the manner in calculating the rate of
interest thereon, 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
                                     -49-
<PAGE>
 
(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, 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 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.

                                      -50-
<PAGE>
 
     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
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 

                                      -51-
<PAGE>
 
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 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.

                                      -52-
<PAGE>
 
     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
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 

                                      -53-
<PAGE>
 
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
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.

                                     -54-
<PAGE>
 
     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.

     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 

                                     -55-
<PAGE>
 
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;

     (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.

                                     -56-
<PAGE>
 
     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.

     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 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

                                     -57-
<PAGE>
 
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 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

                                     -58-
<PAGE>
 
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.

     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

                                     -59-
<PAGE>
 
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 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.

                                     -60-
<PAGE>
 
     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 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.

                                     -61-
<PAGE>
 
     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 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

                                     -62-
<PAGE>
 
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.

     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.

                                    * * * *

                                     -63-
<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


[SEAL]                        By: /s/ Perry R. Pero
                                  ---------------------------------
                                  Name:  Perry R. Pero
                                  Title: Senior Executive Vice President
                                         and Chief Financial Officer


Attest: /s/ Peter L. Rossiter    
        ------------------------
        Peter L. Rossiter
        Executive Vice President,
        General Counsel and Secretary


                              The First National Bank of Chicago,
                              as Trustee


                              By: /s/ John R. Prendiville
[SEAL]                            ---------------------------
                                  Name:  John R. Prendiville
                                  Title: Vice President



Attest: /s/ Jeffrey L. Kinney
        --------------------------
        Jeffrey L. Kinney
        Assistant Vice President
<PAGE>
 
State of Illinois      )
                       ) ss.:
County of Cook         )


     On the 16th day of January, 1997, before me personally came Perry R. Pero,
to me known, who, being by me duly sworn, did depose and say that he is the
Senior Executive Vice President and Chief Financial Officer of Northern Trust
Corporation, one of the corporations described in and which executed the
foregoing instrument; that he 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 signed his
name thereto by like authority.


                                                    /s/ Anne C. Pidgeon
                                                    ----------------------------




State of Illinois      )
                       ) ss.:
County of Cook         )


     On the 16 day of January, 1997, before me personally came John R.
Prendiville, to me known, who, being by me duly sworn, did depose and say that
he/she is Vice President of The First National Bank of Chicago, 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.


                                                    /s/ Theresa M. Carmody  
                                                    ----------------------------

<PAGE>
 
                                                                [Execution Copy]

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


                     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

                   THE ADMINISTRATIVE TRUSTEES NAMED HEREIN

                            ----------------------

                         Dated as of January 16, 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>                                             <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.

                                      -i-
<PAGE>

                               TABLE OF CONTENTS



                                  ARTICLE I.

                                 Defined Terms

<TABLE>
<CAPTION>

<S>           <C>                                                            <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..................................................... 11
Section 2.4.  Issuance of the Capital Securities............................. 11
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............... 12
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.................................................. 16
Section 4.2.  Redemption..................................................... 17
Section 4.3.  Subordination of Common Securities............................. 19
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............. 20
Section 4.7.  Payments under Indenture or Pursuant to Direct Actions......... 20


                                   ARTICLE V.

                         Trust Securities Certificates

Section 5.1.  Initial Ownership.............................................. 20
Section 5.2.  The Trust Securities Certificates.............................. 20
</TABLE>

                                     -ii-
<PAGE>

<TABLE>
<CAPTION>

<S>           <C>                                                            <C>
Section 5.3.  Execution and Delivery of Trust Securities Certificates........ 21
Section 5.4.  Book-Entry Capital Securities.................................. 21
Section 5 5.  Registration of Transfer and Exchange of Capital Securities
                Certificates................................................. 22
Section 5 6.  Mutilated, Destroyed, Lost or Stolen Trust Securities
                Certificates................................................. 24
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................................ 25
Section 5.10. Appointment of Paying Agent.................................... 25
Section 5.11. Ownership of Common Securities by Depositor.................... 25
Section 5.12. Notices to Clearing Agency..................................... 26
Section 5.13. Rights of Holders; Waivers of Past Defaults.................... 26


                                  ARTICLE VI.

                       Acts of Holders; Meetings; Voting

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


                                 ARTICLE VIII.

                              The Issuer Trustees

Section 8.1.  Certain Duties and Responsibilities............................ 33
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
</TABLE>

                                     -iii-
<PAGE>

<TABLE>
<CAPTION>

<S>            <C>                                                           <C>
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................................................... 45
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
Section 10.2.  Amendment..................................................... 48
Section 10.3.  Separability.................................................. 49
Section 10.4.  Governing Law................................................. 49
Section 10.5.  Payments Due on Non-Business Day.............................. 49
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
</TABLE>

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 Capital Securities Certificate

                                     -iv-
<PAGE>
 
  AMENDED AND RESTATED TRUST AGREEMENT, dated as of January 16, 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 Capital 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 I.

                                 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;

  (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
<PAGE>
 
"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 Capital Security, the rules and procedures of the
Clearing Agency for such Book-Entry Capital 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 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.

                                      -2-
<PAGE>
 
  "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 Capital Securities Certificate" means a Capital Securities
Certificate evidencing ownership of Book-Entry Capital Securities.

  "Book-Entry Capital Security" means a Capital 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.

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

  "Capital Security" means an undivided beneficial interest in the assets of the
Issuer Trust, having a Liquidation Amount of $1,000 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.

  "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.

  "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 

                                      -3-
<PAGE>
 
a Liquidation Amount of $1,000 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 Floating Rate Junior Subordinated
Deferrable Interest Debentures, Series A, issued pursuant to the Indenture.

  "Definitive Capital Securities Certificates" means either or both (as the
context requires) of (i) Capital Securities Certificates issued as Book-Entry
Capital Securities Certificates as provided in Section 5.2 or 5.4, and (ii)
Capital 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 created and 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.

  "Determination Date" means, in respect of each Distribution Period, the second
day on which commercial banks are open for business (including dealings in
foreign exchange and foreign currency deposits) in London prior to the
commencement of such Distribution Period.

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

  "Distribution Amount" means, with respect to any Capital Security and any
Distribution Period, the amount of Distributions payable in respect of such
Distribution Period, which amount shall be calculated by applying the
Distribution Rate to the Liquidation Amount of each Trust Security Outstanding
at the commencement of the Distribution Period, by multiplying each such amount
by the actual number of days in the Distribution Period concerned (which actual
number of days shall include the first day but exclude the last day of such
Distribution Period) divided by 360 and rounding the resultant figure upwards to
the nearest cent (half a cent being rounded upwards). The determination of the
Distribution Rate and the Distribution Amount by or on behalf of the Issuer
Trust shall (in the absence of manifest error) be final and binding on all
parties.

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

                                      -4-
<PAGE>
 
  "Distribution Period" means each period beginning on, and including, January
16, 1997, and ending on, but excluding, the first Distribution Date, and each
successive period beginning on, and including, a Distribution Date and ending
on, but excluding, the next succeeding Distribution Date.

  "Distribution Rate" means, with respect to any Distribution Period, a rate per
annum equal to the Interest Rate (as defined in the Debentures) with respect to
the Interest Period under (and as defined in) the Debentures that begins on the
same date as such Distribution Period begins and ends on the same date as such
Distribution Period ends.

  "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
  Capital 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.

  "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 Capital Securities, as amended from time to
time.

                                      -5-
<PAGE>
 
  "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 1,
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 $1,000 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).

  "Majority in Liquidation Amount of the Capital Securities" or "Majority in
Liquidation Amount of the Common Securities" means, except as provided by the
Trust Indenture Act, Capital Securities or Common Securities, as the case may
be, representing more than 50% of the aggregate Liquidation Amount of all then
Outstanding Capital 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;

                                      -6-
<PAGE>
 
  (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 Trust 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 Capital Securities have given any request,
demand, authorization, direction, notice, consent or waiver hereunder, Capital
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 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 Capital 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 Capital Securities are owned by
the Depositor, one or more of the Issuer Trustees and/or any such Affiliate.
Capital 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
Capital 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 Capital
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.

                                      -7-
<PAGE>
 
  "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.

  "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 amount of the premium, if any, paid by the
Depositor upon the concurrent redemption of a Like Amount of Debentures.

  "Relevant Trustee" has 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 Capital Securities" of any particular Capital Securities
Certificate means every Capital 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 Capital Securities Certificate; and, for
the purposes of this definition, any Capital Securities Certificate executed and
delivered under Section 5.6 in exchange for or in lieu of a mutilated,
destroyed, lost or stolen Capital Securities Certificate shall be deemed to
evidence the same beneficial interest in the Issuer Trust as the mutilated,
destroyed, lost or stolen Capital 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 (i) all exhibits, and (ii) 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.

                                      -8-
<PAGE>
 
   "Trust Security" means any one of the Common Securities or the Capital
Securities.

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

   "Underwriting Agreement" means the Pricing Agreement, dated as of January 16,
1997, among the Issuer Trust, the Depositor and the Underwriters named therein,
as the same may be amended from time to time.

   "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 Capital Securities.

  The Depositor, both on its own behalf and on behalf of the Issuer Trust
pursuant to the Original Trust Agreement, has 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, Capital Securities
Certificates, registered in the names requested by the Underwriters,
evidencing an aggregate of 150,000 Capital Securities having an aggregate
Liquidation Amount of $150,000,000, against the aggregate purchase price of such
Capital Securities of $148,500,000.

                                      -9-
<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 4,640 Common Securities having an
aggregate Liquidation Amount of $4,640,000, against the aggregate purchase price
of such Common Securities of $4,593,600. 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 $154,640,000, 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 $153,093,600 (being the sum of the amounts
paid 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;

        (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 Capital Securities under the
     Securities Act and under applicable state securities or blue sky laws and
     the qualification of this

                                     -10-
<PAGE>
 
     Trust Agreement as a trust indenture under the Trust Indenture Act;

        (D) assisting in the listing of the Capital Securities upon such
     securities exchange or exchanges as shall be determined by the Depositor,
     with the registration of the Capital 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 Capital 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;

        (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;

                                     -11-
<PAGE>
 
        (H) 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 Capital 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, 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 Capital Securities, including any
  amendments thereto and the taking of any action necessary or desirable to sell
  the Capital 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 Capital Securities and the
  taking of any and all such acts, other than actions that must be taken by or
  on behalf of the Issuer Trust, and advice to the Issuer Trust of actions that
  must be taken by or 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 Capital 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 Capital Securities;

     (iv) the preparation for filing by the Issuer Trust with the Commission and
  the execution 

                                     -12-
<PAGE>
 
  on behalf of the Issuer Trust of a registration statement on Form 8-A relating
  to the registration of the Capital 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 Capital 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 Capital 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.

  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.

                                     -13-
<PAGE>
 
                                  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 16,
  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 January
  15, April 15, July 15 and October 15 of each year, commencing on April 15,
  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), 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 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 the
  Distribution Rate as in effect from time to time. 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.

  (c) (i) The Issuer Trust shall cause the Distribution Rate, the Distribution
Amount in respect of each Trust Security and the Distribution Date for each
Distribution Period to be notified to the Property Trustee, each Paying Agent
appointed by the Issuer Trust and any securities exchange or automated quotation
system on which the Trust Securities are listed or quoted and also to be
notified to the Holders of the Trust Securities in accordance with the
provisions of Section 10.8, in each case as soon as practicable after the
determination thereof but in no event later than the second Business Day after
the Determination Date in respect of such Distribution Period.

  (ii) All calculations of the Distribution Rate and the Distribution Amount by
or on behalf of the Issuer Trust shall (in the absence of manifest error) be
final and binding on all parties, and all certificates, communications,
opinions, determinations, calculations, quotations and decisions given,
expressed, made or obtained for the purposes of the provisions of this Section
4.1(c) or the provisions of the Indenture relating to the calculation of the
Interest Rate (as defined in the Indenture), whether by the Reference

                                     -14-
<PAGE>
 
Banks (or any of them) or the Debenture Trustee (in each case as defined in the
Indenture), shall (in the absence of willful default, bad faith or manifest
error) be binding on the Issuer Trust, the Depositor, the Debenture Trustee and
all of the Holders of the Trust Securities, and no liability shall (in the
absence of willful default, bad faith or manifest error) attach to the Debenture
Trustee in connection with the exercise or non-exercise by it of its powers,
duties and discretions.

   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 Capital 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;

     (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
Capital 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 Capital Securities, irrevocably deposit with the Clearing Agency for
such Book-Entry Capital 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 Capital Securities. With respect to Capital Securities that are
not Book-Entry Capital 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 Capital Securities upon surrender of their Capital
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

                                     -15-
<PAGE>
 
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 Capital Securities based upon the relative
Liquidation Amounts of such classes. The particular Capital Securities to be
redeemed shall be selected 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 Capital Securities not previously called
for redemption, provided that so long as the Capital Securities are in book-
entry-only form, such selection shall be made in accordance with the customary
procedures for the Clearing Agency for the Capital Securities. The Property
Trustee shall promptly notify the Securities Registrar in writing of the Capital
Securities selected for redemption and, in the case of any Capital 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 Capital Securities shall relate, in
the case of any Capital Securities redeemed or to be redeemed only in part, to
the portion of the aggregate Liquidation Amount of Capital 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 Capital 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 Capital
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 Capital 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 Capital 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 Capital 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

                                     -16-
<PAGE>
 
Default under this Trust Agreement until the effect of all such Events of
Default with respect to the Capital Securities have been cured, waived or
otherwise eliminated. Until all such Events of Default under this Trust
Agreement with respect to the Capital Securities have been so cured, waived or
otherwise eliminated, the Property Trustee shall act solely on behalf of the
Holders of the Capital Securities and not on behalf of the Holders of the Common
Securities, and only the Holders of the Capital 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) or of the
Redemption Price, Liquidation Amount or any other amounts in respect of the
Capital 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 Capital Securities are held by a Clearing Agency, such Distributions shall
be made to the Clearing Agency in immediately available funds. Payments in
respect 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 Capital Securities shall be
reduced by the amount of any corresponding payment such Holder (or Owner with
respect to a Holder's Capital 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.

                                     -17-
<PAGE>
 
   Section 5.2. The Trust Securities Certificates.

  (a) The Capital Securities Certificates shall be issued in minimum
denominations of $1,000 Liquidation Amount and integral multiples of $1,000 in
excess thereof, and the Common Securities Certificates shall be issued in
denominations of $1,000 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 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, Capital Securities Certificates shall be
issued in the form of one or more Book-Entry Capital 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 Capital Securities.

  (a) Each Book-Entry Capital 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 Capital Securities Certificate shall
constitute a single Capital Securities Certificate for all purposes of this
Trust Agreement.

  (b) Notwithstanding any other provision in this Trust Agreement, no Book-Entry
Capital Securities Certificate may be exchanged in whole or in part for Capital
Securities Certificates registered, and no transfer of a Book-Entry Capital
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 Capital 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
Capital 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 Capital
Securities, the Delaware Trustee and the Administrative Trustees of the
occurrence of such event and of the availability of the Definitive Capital
Securities Certificates to Owners of such class or classes, as applicable,
requesting the same.

  (c) If any Book-Entry Capital Securities Certificate is to be exchanged for
other Capital Securities

                                     -18-
<PAGE>
 
Certificates or cancelled in part, or if any other Capital Securities
Certificate is to be exchanged in whole or in part for Book-Entry Capital
Securities represented by a Book-Entry Capital Securities Certificate, then
either (i) such Book-Entry Capital 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 Capital
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 Capital Securities Certificate to be so exchanged or cancelled, or
equal to the Liquidation Amount represented by such other Capital Securities
Certificates to be so exchanged for Book-Entry Capital Securities represented
thereby, as the case may be, by means of an appropriate 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 Capital Securities Certificate or Certificates by the Clearing
Agency, accompanied by registration instructions, the Administrative Trustees,
or any one of them, shall execute the Definitive Capital 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
Capital Securities Certificates, the Issuer Trustees shall recognize the Holders
of the Definitive Capital Securities Certificates as Holders. The Definitive
Capital 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 Capital Securities Certificate executed and delivered upon
registration of transfer of, or in exchange for or in lieu of, a Book-Entry
Capital 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 Capital Securities Certificate, unless such
Capital Securities Certificate is registered in the name of a Person other than
the Clearing Agency for such Book-Entry Capital Securities Certificate or a
nominee thereof.

  (e) The Clearing Agency or its nominee, as registered owner of a Book-Entry
Capital Securities Certificate, shall be the Holder of such Book-Entry Capital
Securities Certificate for all purposes under this Trust Agreement and the Book-
Entry Capital Securities Certificate, and Owners with respect to a Book-Entry
Capital 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 Capital Securities Certificates (including
the payment of the Liquidation Amount of and Distributions on the Book-Entry
Capital Securities represented thereby and the giving of instructions or
directions by Owners of Book-Entry Capital Securities represented thereby) as
the sole Holder of the Book-Entry Capital 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 Capital 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. Pursuant to the
Certificate Depository Agreement, unless and until Definitive Capital 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 Capital 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.

                                     -19-
<PAGE>
 
  Section 5.5. Registration of Transfer and Exchange of Capital 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 Capital 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
Capital 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 Capital 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 Capital 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 Capital Security during a period beginning at the
opening of business fifteen days before the day of selection for redemption of
such Capital 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 Capital Security so selected for redemption in
whole or in part, except, in the case of any such Capital Security to be
redeemed in part, any portion thereof not to be redeemed.

  Every Capital 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
Capital 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 Capital 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 Capital Securities
Certificates.

  (b) Notwithstanding any other provision of this Trust Agreement, transfers and
exchanges of Capital Securities Certificates and beneficial interests in a Book-
Entry Capital Securities Certificate of the kinds specified in this Section
5.5(b) shall be made only in accordance with this Section 5.5(b).

     (i) Non-Book-Entry Capital Securities Certificate to Book-Entry Capital
  Securities Certificate. If the Holder of a Capital Securities Certificate
  (other than a Book-Entry Capital Securities Certificate) wishes at any time to
  transfer all or any portion of such Capital Securities Certificate to a Person
  who wishes to take delivery thereof in the form of a beneficial interest in a
  Book-Entry Capital 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
  Capital 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 Capital Securities Certificate of a specified number of
  Capital Securities not greater than the number of Capital Securities
  represented by such Capital Securities Certificate be credited to a specified
  Clearing Agency Participant's account, then the Securities Registrar shall
  cancel such

                                     -20-
<PAGE>
 
  Capital Securities Certificate (and issue a new Capital 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 Capital
  Securities Certificate by the Liquidation Amount represented by such Capital
  Securities so transferred as provided in Section 5.4(c).

     (ii) Non-Book-Entry Capital Securities Certificate to Non-Book-Entry
  Capital Securities Certificate. A Capital Securities Certificate that is not a
  Book-Entry Capital Securities Certificate may be transferred, in whole or in
  part, to a Person who takes delivery in the form of another Capital Securities
  Certificate that is not a Book-Entry Capital Securities Certificate as
  provided in Section 5.5(a).

     (iii) Exchanges between Book-Entry Capital Securities Certificate and Non-
  Book-Entry Capital Securities Certificate. A beneficial interest in a Book-
  Entry Capital Securities Certificate may be exchanged for a Capital Securities
  Certificate that is not a Book-Entry Capital 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.

   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.

                                     -21-
<PAGE>
 
  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 Capital 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.

  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."

                                     -22-
<PAGE>
 
   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 Capital Securities are represented by
a Book-Entry Capital 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 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 Capital 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 Capital 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 Capital Securities,
by written 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
     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.

                                     -23-
<PAGE>
 
  The Holders of at least a Majority in Liquidation Amount of the Capital
Securities may, on behalf of the Holders of all the Capital 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
Capital Securities a record date shall be established for determining Holders of
Outstanding Capital 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 Capital 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 Default specified in Section 5.1(1) or
5.1(2) of the Indenture, any Holder of Capital 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 Capital 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 Capital 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
Capital Securities may, on behalf of the Holders of all the Capital 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 Capital 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.

                                     -24-
<PAGE>
 
  (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 Capital 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 Capital Securities.
The Property Trustee shall not revoke any action previously authorized or
approved by a vote of the Holders of the Capital Securities, except by a
subsequent vote of the Holders of the Capital Securities. The Property Trustee
shall notify all Holders of the Capital Securities of any notice of default
received with respect to the Debentures. In addition to obtaining the foregoing
approvals of the Holders of the Capital Securities, prior to taking any of the
foregoing actions, the Property Trustee shall, at the expense of the Depositor,
obtain an Opinion of Counsel 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
Capital 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 Capital 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 Capital 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 Capital 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 Capital 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 Capital Securities.

  No annual meeting of Holders is required to be held. The Administrative
Trustees, however, shall call a meeting of the Holders of the Capital Securities
to vote on any matter upon the written request of the Holders of at least 25% in
aggregate Liquidation Amount of the Outstanding Capital Securities and the
Administrative Trustees or the Property Trustee may, at any time in their
discretion, call a meeting of the Holders of the Capital 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 Capital
Securities, present in person or by proxy, shall constitute a quorum at any
meeting of the Holders of the Capital Securities.

  If a quorum is present at a meeting, an affirmative vote by the Holders
present, in person or by

                                     -25-
<PAGE>
 
proxy, holding Capital Securities representing at least a Majority in aggregate
Liquidation Amount of the Capital Securities held by the Holders present, either
in person or by proxy, at such meeting shall constitute the action of the
Holders of the Capital 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 $1,000 of Liquidation Amount
represented by their Outstanding Trust Securities in respect of any matter as to
which such Holders are entitled to vote.

  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
Capital 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.

                                     -26-
<PAGE>
 
     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.

     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.

     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.


                                      -27-
<PAGE>
 
                        REPRESENTATIONS AND WARRANTIES

     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

     (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

                                      -28-
<PAGE>
 
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.

     (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.

                                      -29-
<PAGE>
 
     (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;

          (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 Capital 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

                                      -30-
<PAGE>
 
     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.

     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 Capital 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 

                                      -31-
<PAGE>
 
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 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.

                                      -32-
<PAGE>
 
     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 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
willful 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 willful 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

                                      -33-
<PAGE>
 
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 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.

                                      -34-
<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 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.

                                      -35-
<PAGE>
 
     (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 Capital 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 Capital Securities, by Act of the
Holders of a majority in Liquidation Amount of the Capital 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 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 Capital 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

                                      -36-
<PAGE>
 
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.

     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 Capital
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).

                                      -37-
<PAGE>
 
     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.

     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.

                                      -38-
<PAGE>
 
     (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.

     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 removed by the Holders of a Majority in
Liquidation Amount of the Common Securities at any time.

                                      -39-
<PAGE>
 
     (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 31, 2052 (the "Expiration Date"), following the distribution of the
Trust Property in accordance with Section 9.4.

     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 all of the Holders
of the Common Securities at any time to terminate the Issuer Trust and to
distribute the Debentures to Holders in exchange for the Capital Securities
(which direction is optional and wholly within the discretion of the Holders of
the Common Securities);

     (c) the redemption of all of the Capital 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:

                                      -40-
<PAGE>
 
          (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.

     (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 Capital
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.

                                      -41-
<PAGE>
 
     (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 Capital 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 Capital Securities shall have a priority over the Common
Securities as provided in Section 4.3.

     Section 9.5.  Mergers, Consolidations, Amalgamations or Replacements of
Issuer Trust.

                                      -42-
<PAGE>
 
     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 Capital 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 Capital Securities, or (b)
substitutes for the Capital Securities other securities having substantially the
same terms as the Capital Securities (the "Successor Securities") so long as the
Successor Securities have the same priority as the Capital 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 Capital Securities (including any Successor Securities)
to be downgraded by any nationally recognized statistical rating organization
which assigns ratings to the Capital 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 Capital 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 Capital 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
Capital 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
Capital 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.

     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.

                                      -43-
<PAGE>
 
     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 Capital 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, 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; 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.

     (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 Capital 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 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.

                                      -44-
<PAGE>
 
     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.

     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 Capital 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
the Property Trustee, the Delaware Trustee, the

                                      -45-
<PAGE>
 
Administrative Trustees or the Issuer 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 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.

                                      -46-
<PAGE>
 
     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]

                                      -47-
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have executed this Amended and
Restated Trust Agreement.

                                       NORTHERN TRUST CORPORATION,
                                            as Depositor


                                          /s/ Perry R. Pero
                                       By:___________________________________
                                          Name: Perry R. Pero
                                          Title: Senior Executive Vice President
                                                     and Chief Financial Officer


                                       THE FIRST NATIONAL BANK OF CHICAGO,
                                         as Property Trustee


                                          /s/ Jeffrey L. Kinney
                                       By:___________________________________
                                          Name: Jeffrey L. Kinney
                                          Title: Assistant Vice President


                                       FIRST CHICAGO DELAWARE INC.,
                                         as Delaware Trustee


                                          /s/ John R. Prendiville
                                       By:___________________________________
                                          Name: John R. Prendiville
                                          Title: Vice President

                                          /s/ Donald L. Raiff
                                       By:___________________________________
                                          Name: Donald L. Raiff
                                             as Administrative Trustee

                                          /s/ Duane S. Rocheleau
                                       By:___________________________________
                                          Name: Duane S. Rocheleau
                                             as Administrative Trustee

                                      
<PAGE>
 
STATE OF ILLINOIS )
                  ) ss.:
COUNTY OF COOK    )


     On the 16th day of January, 1997, before me personally came Perry R. Pero,
to me known, who, being by me duly sworn, did depose and say that he/she is
Senior Executive Vice President and Chief Financial Officer of Northern Trust
Corporation, 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 name thereto by like authority.


                                       /s/ Anne C. Pidgeon
                                       ____________________________



STATE OF ILLINOIS )
                  ) ss.:
COUNTY OF COOK    )

     On the 16th day of January, 1997, before me personally came Jeffrey L.
Kinney, to me known, who, being by me duly sworn, did depose and say that he/she
is an Assistant Vice President of The First National Bank of Chicago, 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.


                                       /s/ Theresa M. Carmody
                                       ____________________________
<PAGE>
 
STATE OF ILLINOIS )
                  ) ss.:
COUNTY OF COOK    )


     On the 16th day of January, 1997, before me personally came John R.
Prendiville, to me known, who, being by me duly sworn, did depose and say that
he/she is Vice President of First Chicago Delaware Inc., 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.


                                       /s/ Theresa M. Carmody
                                       ____________________________
<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 create 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 created 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 16, 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
               Floating Rate Capital Securities, Series A
               CUSIP 629394 AA 5
               --------------------------------------

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 Floating Rate Capital Securities, Series A (the
"Capital 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 16, 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 Capital Securities and payments due upon liquidation of the
Issuer or redemption of the Capital 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 16, 1997,
between the Corporation and The First National Bank of Chicago, as Guarantee
Trustee with respect to the Capital Securities. The Corporation and the Issuer
propose to sell the Capital Securities to the Underwriters (the "Underwriters")
pursuant to a Pricing Agreement, dated as of January 9, 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 Capital Securities through DTC. The
First National Bank of Chicago is acting as transfer agent and registrar with
respect to the Capital Securities (the "Transfer Agent and Registrar").

          To induce DTC to accept the Capital Securities as eligible for deposit
at DTC, and to act in accordance with DTC's rules with respect to the Capital
Securities, the Issuer and the Transfer Agent and Registrar make the following
representations to DTC:

          1.  Prior to the closing of the sale of the Capital Securities to the
Underwriters on January 16, 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 

                                      B-1
<PAGE>
 
in the name of DTC's nominee, Cede & Co., representing an aggregate
of 150,000 Capital 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 OTHERWISE 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 Capital 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 Capital 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 Capital 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
Capital Securities is required; and (c) the date any required notice is to be
mailed by or on behalf of the Issuer to holders of Capital 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
Capital Securities. After establishing the amount of payment to be made on the
Capital 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:

                     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 Capital
Securities, notice 

                                      B-2
<PAGE>
 
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 Capital 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 Capital Securities and the accompanying
designation of the Capital Securities, which, as of the date of this letter, is
"NTC Capital I, Floating Rate Capital Securities, Series A".

          8.   Distribution payments or other cash payments with respect to the
Capital 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 Capital 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 Capital 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 Capital 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 Capital Securities, make available one or more
separate global certificates evidencing Capital Securities to any Participant
having Capital Securities credited to its DTC account, or issue definitive
Capital Securities to the beneficial holders thereof, and in 

                                      B-3
<PAGE>
 
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
Capital Securities shall be able to obtain definitive Capital 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:__________________________
                                          Duane S. Rocheleau
                                          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

                        Floating Rate Common Securities
                (liquidation amount $1,000 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 Floating Rate Common
Securities (liquidation amount $1,000 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 16, 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 Trust, 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 16th day of January, 1997.


                                        NTC Capital I

                                        By: ________________________________
                                            Name:  Duane S. Rocheleau
                                            Title: Administrative Trustee

                                      C-1
<PAGE>
 
                                                                       Exhibit D
                          [FORM OF EXPENSE AGREEMENT]

                   AGREEMENT AS TO EXPENSES AND LIABILITIES

     Agreement as to Expenses and Liabilities, dated as of January 16, 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 Floating Rate Capital Securities, Series A (the "Capital 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 16, 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 be effective or shall be
reinstated, as the case may be, if at any time any holder of Capital Securities
or any Beneficiary must restore payment of any sums paid under the Capital
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.


                                      D-1
<PAGE>
 
     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

     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
Capital Securities are outstanding, this Agreement shall not be modified or
amended in any manner adverse to such Beneficiary or to the holders of the
Capital Securities without the consent of such Beneficiary or the holders of the
Capital 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

                                      D-2
<PAGE>
 
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 LAW PRINCIPLES.

                                      D-3
<PAGE>
 
     THIS AGREEMENT is executed as of the day and year first above written.


                                       NORTHERN TRUST CORPORATION


                                       By:_____________________________________
                                          Name: Perry R. Pero
                                          Title: Senior Executive Vice President
                                          and Chief Financial Officer

                                       NTC CAPITAL I


                                       By:_____________________________________
                                          Name: Duane S. Rocheleau
                                          Administrative Trustee

                                      D-4
<PAGE>
 
                                                                       Exhibit E
                   [FORM OF CAPITAL SECURITIES CERTIFICATE]

     [IF THE CAPITAL SECURITIES CERTIFICATE IS TO BE EVIDENCED BY A BOOK-ENTRY
CAPITAL SECURITIES CERTIFICATE, INSERT--This Capital Securities Certificate is a
Book-Entry Capital 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 Capital Securities Certificate is
exchangeable for Capital 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 Capital 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 Capital 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 CAPITAL SECURITIES

  CAI-

                             CUSIP NO. 629394 AA 5

                   CERTIFICATE EVIDENCING CAPITAL SECURITIES

                                      OF

                                 NTC CAPITAL I

                  FLOATING RATE CAPITAL SECURITIES, SERIES A
               (LIQUIDATION AMOUNT $1,000 PER CAPITAL 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 ________(_______________ ) Capital
Securities of the Issuer Trust representing an undivided beneficial interest in
the assets of the Issuer Trust and designated the NTC Capital I Floating Rate
Capital Securities, Series A (liquidation amount $1,000 per Capital Security)
(the "Capital Securities"). The Capital 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 Capital Securities are set forth in, and this certificate and
the Capital 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 16, 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 Trust, including the
designation of the terms of the Capital 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 16, 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 16th day of January, 1997.

                                       NTC CAPITAL I


                                       By:____________________________________
                                          Name:  Duane S. Rocheleau
                                          Administrative Trustee

                                      E-3
<PAGE>
 
                                  ASSIGNMENT

     FOR VALUE RECEIVED, the undersigned assigns and transfers this Capital
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 Capital 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 Capital
          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>
 
                                                                [Execution Copy]

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



                              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 16, 1997

                               ----------------        


================================================================================
<PAGE>

 
                            CROSS-REFERENCE TABLE*
 

Section of
Trust Indenture Act                                           Section of
of 1939, as amended                                      Guarantee Agreement
- -------------------                                      -------------------
<TABLE>
<CAPTION>
<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
                                                                            Page


                                   ARTICLE I

                                  Definitions

<TABLE>
<CAPTION>

<S>                                                              <C>
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
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
</TABLE>

                                     -ii-
<PAGE>

                                  ARTICLE VI

                          Covenants and Subordination

<TABLE>
<CAPTION>

<S>                                                              <C>
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 16, 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 Capital 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 16, 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 Floating Rate
Capital Securities, Series A (liquidation amount $1,000 per Capital Security)
(the "Capital 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 Capital 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 Capital Securities,
the Guarantor desires irrevocably and unconditionally to agree, to the extent
set forth herein, to pay to the Holders of the Capital 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 Capital 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;

     (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;
<PAGE>
 
     (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.

     "Capital Securities" has the meaning specified in the recitals to this
Guarantee Agreement.

     "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 Capital 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
Capital 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 Capital 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 Capital 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
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.

                                      -2-
<PAGE>
 
     "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
Capital Securities; provided, however, that in determining whether the holders
of the requisite percentage of Capital 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 1,
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 Capital Securities" means, except as
provided by the Trust Indenture Act, Capital Securities representing more than
50% of the aggregate Liquidation Amount (as defined in the Trust Agreement) of
all Capital 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.

     "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.

     "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.

                                      -3-
<PAGE>
 
     "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 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 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.

     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.

                                      -4-
<PAGE>
 
     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 Capital
Securities may, by vote, on behalf of the Holders of all the Capital 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.

     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.

                                      -5-
<PAGE>
 
     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 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

                                      -6-
<PAGE>
 
     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 Capital 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.

     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

                                      -7-
<PAGE>
 
     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 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

                                      -8-
<PAGE>
 
result of any amount due to it under this Guarantee Agreement.


                                  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 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.

                                      -9-
<PAGE>
 
                                   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 Capital 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 Capital Securities or the extension of time for the performance of
     any other obligation under, arising out of, or in connection with, the
     Capital 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 Capital
     Securities, or any action on the part of the Issuer Trust granting
     indulgence or extension of any kind;

          (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 Capital
     Securities;

          (f) the settlement or compromise of any obligation guaranteed hereby
     or hereby incurred; or

                                     -10-
<PAGE>
 
          (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 Capital 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
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 Capital 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.

                                     -11-
<PAGE>
 
     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 Capital 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 Capital Securities, (ii) the distribution of Debentures to the
Holders in exchange for all of the Capital 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
Capital Securities or this Guarantee Agreement.

                                     -12-
<PAGE>
 
     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 Capital
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
Capital 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 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

                                     -13-
<PAGE>
 
     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 Capital 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.

                                     -14-
<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:  /s/ Perry R. Pero
                                          ---------------------------------
                                     Name:  Perry R. Pero
                                     Title: Senior Executive Vice President
                                            and Chief Financial Officer


                                     The First National Bank of Chicago,
                                     as Guarantee Trustee


                                     By: /s/ Jeffrey L. Kinney
                                         --------------------------------- 
                                     Name:  Jeffrey L. Kinney
                                     Title: Assistant Vice President

                                     -15-
<PAGE>
 
State of Illinois   )
                    ) ss.:
County of Cook      )


     On the 16th day of January, 1997, before me personally came Perry R. Pero,
to me known, who, being by me duly sworn, did depose and say that he is Senior
Executive Vice President and Chief Financial Officer of Northern Trust
Corporation, one of the corporations described in and which executed the
foregoing instrument; that he 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 signed his
name thereto by like authority.



                                       /s/ Anne C. Pidgeon
                                       --------------------------




State of Illinois   )
                    ) ss.:
County of Cook      )


     On the 16th day of January, 1997, before me personally came Jeffrey L.
Kinney, to me known, who, being by me duly sworn, did depose and say that he/she
is an Assistant Vice President of The First National Bank of Chicago, 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.



                                      /s/ Theresa M. Carmody
                                      ---------------------------

                                     -16-

<PAGE>
                                        
            SCHEDULED RELEASE TIME:  7:30 A.M. ON JANUARY 21, 1997

- --------------------------------------------------------------------------------
                                  NEWS RELEASE
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
                          NORTHERN TRUST CORPORATION
                            50 South LaSalle Street
                            Chicago, Illinois 60675
                  Contact: Laurie McMahon, Investor Relations
                               (312) 444-7811 or
                     Diane Kotsogiannis, Public Relations
                                (312) 444-4281
- --------------------------------------------------------------------------------


FOR IMMEDIATE RELEASE
- ---------------------

NORTHERN TRUST CORPORATION REPORTS RECORD 1996 FOURTH
QUARTER EARNINGS OF $.58 PER SHARE, UP 16%

(CHICAGO, JANUARY 21, 1997) NORTHERN TRUST CORPORATION REPORTED RECORD NET
INCOME PER COMMON SHARE OF $.58 FOR THE FOURTH QUARTER, AN INCREASE OF 16% FROM
$.50 EARNED A YEAR AGO, AFTER ADJUSTING FOR THE DECEMBER 1996 TWO-FOR-ONE STOCK
SPLIT.  NET INCOME INCREASED 13% TO $67.4 MILLION FROM $59.5 MILLION EARNED IN
THE FOURTH QUARTER OF LAST YEAR.  THIS PERFORMANCE RESULTED IN A RETURN ON
AVERAGE COMMON EQUITY OF 18.8%.

     FULL YEAR NET INCOME PER COMMON SHARE WAS ALSO A RECORD AND INCREASED TO
$2.20 FROM $1.85 IN 1995, AN INCREASE OF 19%.  NET INCOME OF $258.8 MILLION IN
1996  INCREASED 18% FROM THE $220.0 MILLION EARNED LAST YEAR.  THIS PERFORMANCE
RESULTED IN A RETURN ON AVERAGE COMMON EQUITY OF 18.6%.

                                       1
<PAGE>
 
     WILLIAM A. OSBORN, CHAIRMAN AND CHIEF EXECUTIVE OFFICER, COMMENTED, "THE
BEST NEW BUSINESS YEAR IN OUR HISTORY PRODUCED RECORD EARNINGS AGAIN IN 1996 AND
POSITIONS NORTHERN TRUST WELL FOR 1997.  OUR NINTH CONSECUTIVE YEAR OF RECORD
EARNINGS RESULTED FROM EXCELLENT GROWTH IN ALL OF OUR DIVERSIFIED REVENUE
SOURCES.  FOR THE LAST FIVE YEARS, OUR COMPOUND ANNUAL GROWTH RATE IN EARNINGS
PER SHARE HAS BEEN 14%.  IN THE FOURTH QUARTER TOTAL REVENUES INCREASED 12% FROM
1995 LEVELS, CONTINUING THEIR DOUBLE DIGIT PACE, AND WERE DRIVEN BY RECORD
LEVELS OF TRUST FEES AND NET INTEREST INCOME AS WELL AS SIGNIFICANT GROWTH IN
FOREIGN EXCHANGE AND TREASURY MANAGEMENT REVENUES.  OUR 16% EARNINGS PER SHARE
GROWTH FOR THE QUARTER, A PRODUCTIVITY RATIO OF 155% AND AN 18.8% RETURN ON
COMMON EQUITY SOLIDLY EXCEEDED EACH OF OUR STRATEGIC FINANCIAL TARGETS.  TRUST
ASSETS UNDER ADMINISTRATION GREW 27% DURING THE YEAR TO $779 BILLION, WITH
ASSETS UNDER MANAGEMENT INCREASING 23% TO $130 BILLION."
 
     MR. OSBORN CONTINUED, "THESE OUTSTANDING RESULTS AGAIN CONFIRM THE SUCCESS
OF NORTHERN TRUST'S HIGHLY DISCIPLINED STRATEGY.  WE CONTINUE TO FOCUS OUR
EFFORTS ON GROWING OUR TWO SHARPLY DEFINED BUSINESSES: A UNIQUE NATIONAL
PERSONAL FINANCIAL SERVICES FRANCHISE, AND OUR BUSINESS ADMINISTERING AND
MANAGING DOMESTIC AND GLOBAL INVESTMENT ASSET POOLS FOR CORPORATE AND
INSTITUTIONAL CLIENTS WORLDWIDE."

                     FOURTH QUARTER PERFORMANCE HIGHLIGHTS

     TRUST FEES GREW 14% TO A RECORD $152.0 MILLION IN THE QUARTER COMPARED TO
$133.6 MILLION LAST YEAR AND REPRESENT 49% OF REVENUE AND 76% OF NONINTEREST
INCOME.  TOTAL TRUST ASSETS UNDER ADMINISTRATION AT DECEMBER 31, 1996 WERE
$778.9 BILLION COMPARED TO $613.9 BILLION A YEAR AGO, AN INCREASE OF 27%.  TRUST
ASSETS UNDER MANAGEMENT INCREASED 23% TO $130.3 BILLION, FROM $105.5 BILLION AT
THE END OF 1995.

                                       2
<PAGE>
 
               FOURTH QUARTER PERFORMANCE HIGHLIGHTS (CONTINUED)

     TRUST FEES FROM PERSONAL FINANCIAL SERVICES (PFS) IN THE QUARTER INCREASED
13% AND TOTALED $77.0 MILLION COMPARED TO $68.2 MILLION IN THE YEAR-AGO QUARTER.
THE INCREASE IN PFS TRUST FEES RESULTED PRIMARILY FROM EXCEPTIONALLY STRONG NEW
BUSINESS AND FAVORABLE EQUITY MARKETS AND REFLECTED STRONG GROWTH THROUGHOUT
NORTHERN TRUST'S FIVE-STATE OFFICE NETWORK.  WEALTH MANAGEMENT, WHICH
ADMINISTERS SIGNIFICANT FAMILY ASSET POOLS NATIONWIDE, ALSO HAD EXCELLENT
PERFORMANCE AND NOW HAS $22.6 BILLION OF TRUST ASSETS FROM 140 FAMILIES.  TOTAL
PERSONAL TRUST ASSETS UNDER ADMINISTRATION INCREASED $4.4 BILLION SINCE
SEPTEMBER 30, 1996 AND TOTALED $85.2 BILLION AT DECEMBER 31, 1996, $49.9 BILLION
OF WHICH WAS UNDER MANAGEMENT.

     DURING THE FOURTH QUARTER, NORTHERN TRUST EXPANDED ITS ARIZONA PRESENCE BY
OPENING A NEW OFFICE IN MESA'S EAST VALLEY, BRINGING TO SIX THE TOTAL NUMBER OF
OFFICES IN THIS ATTRACTIVE MARKET.  IN ADDITION, NORTHERN TRUST CORPORATION
COMPLETED THE ACQUISITION OF METROPLEX BANCSHARES, INC., PARENT COMPANY OF THE
$88 MILLION ASSET BENT TREE NATIONAL BANK IN DALLAS, TEXAS.  THE ACQUISITION
ADDS A NORTH DALLAS LOCATION TO NORTHERN TRUST'S SIX EXISTING TEXAS FACILITIES.
WITH THE ADDITION OF SEVEN NEW OFFICES IN 1996, NORTHERN TRUST'S UNIQUE NATIONAL
NETWORK OF PERSONAL FINANCIAL SERVICE OFFICES INCLUDES 57 LOCATIONS IN ILLINOIS,
FLORIDA, CALIFORNIA, ARIZONA, AND TEXAS.

     TRUST FEES FROM CORPORATE & INSTITUTIONAL SERVICES (C&IS) IN THE QUARTER
INCREASED 15% AND TOTALED $75.0 MILLION COMPARED TO $65.4 MILLION IN THE YEAR-
AGO QUARTER.  THESE FEES ARE DERIVED FROM A FULL RANGE OF CUSTODY, INVESTMENT 
AND ADVISORY SERVICES RENDERED TO RETIREMENT AND OTHER ASSET POOLS OF CORPORATE
AND INSTITUTIONAL CLIENTS WORLDWIDE.  THE INCREASE IN C&IS TRUST FEES REFLECTS
RECORD NET

                                       3
<PAGE>
 
               FOURTH QUARTER PERFORMANCE HIGHLIGHTS (CONTINUED)

NEW BUSINESS, MODERATED BY THE EFFECT OF CHANGING PRICING STRUCTURES FOR CLIENT
RELATIONSHIPS WHICH FOCUS ON TOTAL CLIENT REVENUES.  THESE CLIENT RELATIONSHIPS
INCREASINGLY INVOLVE SERVICES SUCH AS FOREIGN EXCHANGE WHICH GENERATE REVENUE
NOT REFLECTED IN TRUST FEES.  SECURITIES LENDING ACTIVITIES CONTINUED TO ACHIEVE
OUTSTANDING RESULTS, WITH FEES INCREASING 50% FROM THE PRIOR YEAR QUARTER TO
$13.4 MILLION.  SINCE SEPTEMBER 30, 1996, TOTAL C&IS TRUST ASSETS UNDER
ADMINISTRATION INCREASED $51.8 BILLION TO $693.7 BILLION AT DECEMBER 31, 1996,
OF WHICH $80.4 BILLION IS MANAGED BY NORTHERN TRUST.  INCLUDED IN THE TOTAL FOR
TRUST ASSETS UNDER ADMINISTRATION IS APPROXIMATELY $108 BILLION OF GLOBAL
CUSTODY ASSETS.

     AS PREVIOUSLY REPORTED, NORTHERN TRUST IN THE THIRD QUARTER WAS NAMED THE
PREFERRED PROVIDER OF MASTER TRUST AND DOMESTIC INSTITUTIONAL CUSTODY SERVICES
FOR CLIENTS OF FIRST CHICAGO NBD AS IT EXITS THAT BUSINESS.  TO DATE, CLIENTS
WITH APPROXIMATELY $25 BILLION IN TRUST ASSETS AND ANNUALIZED REVENUES OF
APPROXIMATELY $7.5 MILLION HAVE SELECTED NORTHERN TRUST, AND TARGETED MARKETING
EFFORTS CONTINUE.  THE TRANSITION OF THESE CLIENTS IS EXPECTED TO BE COMPLETED
DURING THE FIRST HALF OF 1997.

     FOREIGN EXCHANGE TRADING PROFITS OF $16.1 MILLION WERE UP A SIGNIFICANT 31%
FROM THE $12.3 MILLION IN THE YEAR-AGO QUARTER.  FOREIGN EXCHANGE TRADING
PROFITS ARE IMPACTED BY THE LEVEL OF CROSS-BORDER INVESTMENT ACTIVITY OF MASTER
TRUST/CUSTODY CLIENTS AND MARKET VOLATILITY.  FEES FROM TREASURY MANAGEMENT
SERVICES WERE $13.9 MILLION, UP 9% FROM THE COMPARABLE QUARTER LAST YEAR.  TOTAL
TREASURY MANAGEMENT REVENUES FROM BOTH FEES AND THE COMPUTED VALUE OF
COMPENSATING DEPOSIT BALANCES INCREASED 10% FROM THE FOURTH QUARTER OF 1995 TO
$21.7 MILLION, REFLECTING THE CONTINUED GROWTH IN NEW BUSINESS IN BOTH PAPER-AND
ELECTRONIC-BASED PRODUCTS.

                                       4
<PAGE>
 
               FOURTH QUARTER PERFORMANCE HIGHLIGHTS (CONTINUED)

     NET INTEREST INCOME FOR THE QUARTER, STATED ON A FULLY TAXABLE EQUIVALENT
BASIS, TOTALED A RECORD $108.4 MILLION, UP 8% FROM THE $100.7 MILLION REPORTED
IN LAST YEAR'S FOURTH QUARTER.  THE INCREASE IN NET INTEREST INCOME REFLECTS
HIGHER LEVELS OF AVERAGE EARNING ASSETS PRIMARILY DRIVEN BY A 12% INCREASE IN
LOANS.  LOAN GROWTH WAS CONCENTRATED IN RESIDENTIAL MORTGAGES AND COMMERCIAL AND
INDUSTRIAL LOANS.  THE NET INTEREST MARGIN IMPROVED TO 2.30% FROM 2.22% REPORTED
IN THE YEAR-AGO QUARTER.

     CREDIT QUALITY IS EXCEPTIONAL.  NONPERFORMING ASSETS OF $21.4 MILLION AT
YEAR END WERE AT THEIR LOWEST LEVEL IN OVER FIFTEEN YEARS, IMPROVING FROM $37.7
MILLION AT SEPTEMBER 30, 1996 AND $33.7 MILLION AT DECEMBER 31, 1995.  
NONACCRUAL AND RESTRUCTURED LOANS OF $19.5 MILLION AT YEAR END REPRESENT .18% OF
TOTAL LOANS AND WERE COVERED 7.6 TIMES BY THE $148.3 MILLION RESERVE FOR CREDIT
LOSSES.  FOURTH QUARTER NET CHARGE-OFFS, AT .02% OF AVERAGE LOANS, TOTALED $.6
MILLION.  THE $.5 MILLION PROVISION FOR CREDIT LOSSES, DOWN FROM $1.0 MILLION A
YEAR AGO, ESSENTIALLY MAINTAINED THE RESERVE FOR CREDIT LOSSES AT ITS PRIOR
QUARTER LEVEL.

     NONINTEREST EXPENSES OF $199.9 MILLION WERE UP $21.4 MILLION OR 12% FROM
THE FOURTH QUARTER OF 1995.  EXPENSE INCREASES DURING 1996 REFLECT A VARIETY OF
GROWTH INITIATIVES, INCLUDING INVESTMENTS IN TECHNOLOGY, THE OPENING OF A
SINGAPORE OFFICE, PFS OFFICE EXPANSION, AND ACQUISITIONS.  THE FOURTH QUARTER
INCREASE IN NONINTEREST EXPENSES PRIMARILY REFLECTS STAFF ADDITIONS IN THE
QUARTER TO HANDLE NEW BUSINESS AND MAINTAIN HIGH QUALITY CLIENT SERVICE;
INCENTIVE COMPENSATION YEAR-END ADJUSTMENTS FOR RECORD PERFORMANCE DUE TO
EXCELLENT NEW BUSINESS AND PORTFOLIO MANAGEMENT RESULTS; INCREASED BUSINESS
PROMOTION ACTIVITIES LINKED TO OFFICE OPENINGS; AND OTHER OPERATING EXPENSES
NECESSARY TO SUPPORT GREATER BUSINESS VOLUMES.  THESE INCREASES WERE PARTIALLY
OFFSET BY COST SAVINGS FROM CHANGES IN

                                       5
<PAGE>
 
SEVERAL BENEFIT PLANS EFFECTIVE JANUARY 1, 1996.  STAFF ON A FULL-TIME
EQUIVALENT BASIS AT DECEMBER 31, 1996 TOTALED 6,933, UP 6% FROM 6,531 AT THE END
OF 1995.

                                 BALANCE SHEET

     BALANCE SHEET ASSETS AVERAGED $21.0 BILLION FOR THE QUARTER, UP 3.5% FROM
LAST YEAR'S AVERAGE OF $20.3 BILLION, REFLECTING GROWTH IN LOANS AND MONEY
MARKET ASSETS, WHICH WAS PARTIALLY OFFSET BY A DECLINE IN SECURITIES.  LOANS AND
LEASES AVERAGED $10.8 BILLION FOR THE QUARTER, AN INCREASE OF $1.2 BILLION OR
12%. RESIDENTIAL MORTGAGES INCREASED $.7 BILLION OR 17% TO AVERAGE $4.5 BILLION
FOR THE QUARTER AND REPRESENTED 42% OF THE TOTAL LOAN PORTFOLIO AT DECEMBER 31,
1996.  COMMERCIAL AND INDUSTRIAL LOANS AVERAGED $3.4 BILLION DURING THE QUARTER
COMPARED TO $3.1 BILLION IN THE FOURTH QUARTER OF 1995.  THE SECURITIES 
PORTFOLIO DECLINED 11% TO AVERAGE $5.7 BILLION PRIMARILY DUE TO A REDUCTION IN
SHORT-TERM U.S. GOVERNMENT SECURITIES.  MONEY MARKET ASSETS INCREASED 18% AND
AVERAGED $2.2 BILLION DURING THE QUARTER.

      COMMON STOCKHOLDERS' EQUITY AVERAGED $1.4 BILLION, AN INCREASE OF 12% FROM
LAST YEAR'S FOURTH QUARTER.  THE INCREASE PRIMARILY REFLECTS GROWTH IN RETAINED
EARNINGS AND THE CONVERSION OF SERIES E PREFERRED STOCK, OFFSET IN PART BY THE
REPURCHASE OF COMMON STOCK PURSUANT TO THE CORPORATION'S SHARE BUYBACK PROGRAM.
DURING THE QUARTER, THE CORPORATION ACQUIRED A TOTAL OF 786,672 SHARES AT A COST
OF $27.7 MILLION.  IN NOVEMBER, THE BOARD OF DIRECTORS AUTHORIZED AN INCREASE
IN THE CORPORATION'S BUYBACK PROGRAM SO THAT THE CORPORATION MAY PURCHASE AFTER
DECEMBER 31, 1996 UP TO 4.6 MILLION SHARES.

     ON JANUARY 16, 1997 THE CORPORATION ISSUED $150 MILLION OF FLOATING RATE
CAPITAL SECURITIES THROUGH A WHOLLY OWNED STATUTORY BUSINESS TRUST.  THE
SECURITIES, WHICH QUALIFY AS TIER 1 CAPITAL FOR REGULATORY PURPOSES, WERE ISSUED
AT A DISCOUNT TO YIELD 60.5 BASIS POINTS ABOVE THE THREE-MONTH LONDON INTERBANK
OFFERED RATE.

                                       6
<PAGE>
 
                         PERFORMANCE HIGHLIGHTS - 1996

     NET INCOME PER COMMON SHARE INCREASED 19% TO $2.20 FROM $1.85 IN 1995.  NET
INCOME TOTALED $258.8 MILLION COMPARED WITH $220.0 MILLION LAST YEAR, AN
INCREASE OF 18%.

     TOTAL REVENUES INCREASED 12% TO $1.2 BILLION.  TRUST FEES, THE LARGEST
COMPONENT, INCREASED 17% TO $592.3 MILLION FROM $505.0 MILLION IN THE PRIOR
YEAR, ACCOUNTING FOR 76% OF TOTAL NONINTEREST INCOME AND 49% OF TOTAL REVENUE.
FEES FROM PFS GREW 13% OVER LAST YEAR AND TOTALED $294.0 MILLION WHILE C&IS FEES
GREW 22% FROM 1995 LEVELS AND TOTALED $298.3 MILLION.  FEES GENERATED BY RCB
INTERNATIONAL, INC., AN ASSET MANAGEMENT SUBSIDIARY ACQUIRED ON OCTOBER 31,
1995, ACCOUNTED FOR $21.8 MILLION OF THE TRUST FEE GROWTH.  EXCLUDING THESE
REVENUES, BOTH C&IS TRUST FEES AND TOTAL CONSOLIDATED TRUST FEES INCREASED 13%
COMPARED TO 1995.

     OTHER NONINTEREST INCOME INCREASED 7% AND TOTALED $185.6 MILLION COMPARED
TO $173.1 MILLION IN 1995.  TREASURY MANAGEMENT REVENUES FROM BOTH FEES AND THE
COMPUTED VALUE OF COMPENSATING DEPOSIT BALANCES INCREASED 11% TO $86.0 MILLION,
WHILE FOREIGN EXCHANGE TRADING PROFITS IMPROVED 6% TO A RECORD $58.8 MILLION.

     NET INTEREST INCOME, STATED ON A FULLY TAXABLE EQUIVALENT BASIS, TOTALED A
RECORD $421.9 MILLION, UP 7% FROM THE $395.2 MILLION REPORTED LAST YEAR.  THE
INCREASE IN NET INTEREST INCOME WAS DUE TO A 9% INCREASE IN AVERAGE EARNING
ASSETS DRIVEN BY A 13% INCREASE IN LOANS.  THE NET INTEREST MARGIN DECLINED
SLIGHTLY TO 2.25% FROM 2.30% IN 1995.

                                       7
<PAGE>
 
                   PERFORMANCE HIGHLIGHTS - 1996 (CONTINUED)
                                        
     THE PROVISION FOR CREDIT LOSSES INCREASED $6.0 MILLION TO $12.0 MILLION IN
1996.  NET CHARGE-OFFS OF $11.8 MILLION REPRESENTED .11% OF AVERAGE LOANS
COMPARED TO $5.9 MILLION OR .06% OF AVERAGE LOANS IN 1995.  THE RESERVE FOR
CREDIT LOSSES TOTALED $148.3 MILLION REPRESENTING 1.36% OF OUTSTANDING LOANS AT
DECEMBER 31, 1996.
 
     NONINTEREST EXPENSES INCREASED $57.6 MILLION OR 8% AND TOTALED $766.8
MILLION IN 1996, INCLUDING $25.3 MILLION OF INCREMENTAL EXPENSES RESULTING FROM
ACQUISITIONS.  DUE TO THE REDUCTION IN PREMIUM RATES, FDIC INSURANCE EXPENSE
DECLINED $8.5 MILLION COMPARED TO LAST YEAR.  EXCLUSIVE OF THESE ITEMS, 1996
NONINTEREST EXPENSES INCREASED 5.8% OVER LAST YEAR.

     SALARIES AND BENEFITS INCREASED TO $441.3 MILLION FROM $419.1 MILLION LAST
YEAR.  THE PRINCIPAL ITEMS CONTRIBUTING TO THE CHANGE WERE MERIT INCREASES,
INCENTIVE COMPENSATION, AND STAFF ADDITIONS RESULTING FROM ACQUISITIONS AND TO
SUPPORT NORTHERN TRUST'S GROWING TRUST ACTIVITIES AND OFFICE EXPANSION.  THE
INCENTIVE COMPENSATION EXPENSE INCREASE REFLECTS THE IMPACT OF RECORD NEW
BUSINESS DEVELOPMENT RESULTS AND INVESTMENT PORTFOLIO PERFORMANCE OF TRUST
CLIENTS, AS WELL AS THE 1996 RECORD PERFORMANCE.  THESE INCREASES WERE PARTIALLY
OFFSET BY COST SAVINGS FROM CHANGES IN SEVERAL BENEFIT PLANS EFFECTIVE JANUARY
1, 1996 AS WELL AS LOWER SEVERANCE RELATED COSTS.  THE INCREASE IN NON STAFF-
RELATED EXPENSES WAS PRIMARILY THE RESULT OF CONTINUED INVESTMENT IN TECHNOLOGY,
EXPANSION OF THE PERSONAL TRUST AND BANKING OFFICE NETWORK, AND HIGHER OPERATING
EXPENSES NECESSARY TO SUPPORT BUSINESS GROWTH.

                                     / / /

                                       8
<PAGE>

                                                                          Page 1
                          NORTHERN TRUST CORPORATION
               (Supplemental Consolidated Financial Information)

STATEMENT OF INCOME STATISTICS ($ IN MILLIONS)
- ----------------------------------------------
<TABLE>
<CAPTION>
                                                                FOURTH QUARTER
                                                     -------------------------------------
                                                      1996            1995      % Change *
                                                     -------------------------------------
<S>                                                  <C>            <C>            <C>
Net Interest Income (Taxable Equivalent)               $108.4         $100.7         7.6%
Less: Taxable Equivalent Adjustment                       7.8            9.0       (14.8)
                                                     --------       --------       -----
Net Interest Income                                     100.6           91.7         9.8
Provision for Credit Losses                               0.5            1.0       (50.0)

Noninterest Income
     Trust Fees                                         152.0          133.6        13.7
     Treasury Management Fees                            13.9           12.7         9.0
     Foreign Exchange Trading Profits                    16.1           12.3        30.8
     Security Commissions & Trading Income                6.2            4.8        27.8
     Other Operating Income                              12.4           10.7        17.8
     Investment Security Transactions                     0.1            0.5         N/M
                                                     --------       --------       -----
Total Noninterest Income                                200.7          174.6        14.9

Noninterest Expenses
     Salaries                                            98.7           86.7        13.8
     Pension and Other Employee Benefits                 15.2           18.8       (18.9)
     Occupancy Expense                                   16.1           15.1         6.5
     Equipment Expense                                   13.2           12.0        10.8
     Other Operating Expenses                            56.6           45.9        23.2
                                                     --------       --------       -----
Total Noninterest Expenses                              199.9          178.5        12.0
                                                     --------       --------       -----

Income Before Income Taxes                              100.9           86.8        16.4
Provision for Income Taxes                               33.5           27.3        23.0
                                                     --------       --------       -----

NET INCOME                                              $67.4          $59.5        13.3%
                                                     ========       ========       =====

Net Income Per Common Share
     Primary                                            $0.58          $0.51        14.3%
     Fully Diluted                                       0.58           0.50        15.7

Return on Average Common Equity                         18.79%         18.19%
Average Common Equity                                $1,401.5       $1,252.1        11.9%
Return on Average Assets                                 1.28%          1.16%

Common Dividend Declared per Share                      $0.18          $0.16        16.1%
Preferred Dividends (millions)                            1.2            2.1       (42.5)

Average Common Shares Outstanding (000s)
     Primary                                          114,196        113,203
     Fully Diluted                                    114,392        116,276
</TABLE>
(N/M) Not Meaningful
  (*) Percentage change calculations are based on actual balances rather than
      the rounded amounts presented in Supplemental Consolidated Financial
      Information.
Note: Per common share data reflect the two-for-one stock split effected by a
      100% common stock distribution on December 9, 1996 to holders of record on
      December 2, 1996.
<PAGE>


                                                                          Page 2
                          NORTHERN TRUST CORPORATION
               (Supplemental Consolidated Financial Information)

STATEMENT OF INCOME STATISTICS ($ IN MILLIONS)

<TABLE>
<CAPTION>
                                                             TWELVE MONTHS
                                                 ------------------------------------
                                                     1996          1995     % Change *
                                                 ------------------------------------
<S>                                               <C>           <C>         <C>
Net Interest Income (Taxable Equivalent)            $421.9        $395.2          6.8%
Less: Taxable Equivalent Adjustment                   33.6          37.6        (10.8)
                                                  --------      --------     --------
Net Interest Income                                  388.3         357.6          8.6
Provision for Credit Losses                           12.0           6.0        100.0

Noninterest Income
     Trust Fees                                      592.3         505.0         17.3
     Treasury Management Fees                         55.3          49.6         11.5
     Foreign Exchange Trading Profits                 58.8          55.3          6.3
     Security Commissions & Trading Income            23.9          21.7         10.1
     Other Operating Income                           47.2          45.5          3.8

     Investment Security Transactions                  0.4           1.0          N/M
                                                  --------      --------     --------
Total Noninterest Income                             777.9         678.1         14.7

Noninterest Expenses
     Salaries                                        368.8         337.6          9.2
     Pension and Other Employee Benefits              72.5          81.5        (11.0)
     Occupancy Expense                                63.8          60.2          5.9
     Equipment Expense                                54.6          48.6         12.4
     Other Operating Expenses                        207.1         181.3         14.2
                                                  --------      --------     --------
Total Noninterest Expenses                           766.8         709.2          8.1
                                                  --------      --------     --------

Income Before Income Taxes                           387.4         320.5         20.9
Provision for Income Taxes                           128.6         100.5         28.0
                                                  --------      --------     --------

NET INCOME                                          $258.8        $220.0         17.6%
                                                  ========      ========      =======

Earnings Per Common Share
     Primary                                         $2.21         $1.88         18.0%
     Fully Diluted                                    2.20          1.85         19.0

Return on Average Common Equity                      18.64%        17.58%
Average Common Equity                             $1,361.9      $1,202.7         13.2%
Return on Average Assets                              1.23%         1.13%

Common Dividends Declared per Share                   0.65          0.55         18.3%
Preferred Dividends (millions)                         4.9           8.5        (42.1)

Average Common Shares Outstanding (000s)
     Primary                                       114,648       112,676
     Fully Diluted                                 115,467       116,138
</TABLE>
<PAGE>

                          NORTHERN TRUST CORPORATION
               (Supplemental Consolidated Financial Information)

BALANCE SHEET ($ IN MILLIONS)
- -----------------------------
<TABLE>
<CAPTION>
                                                                 DECEMBER 31
                                                    -------------------------------------
                                                       1996          1995      % Change*
                                                    -------------------------------------
<S>                                                  <C>           <C>       <C>
Assets
- ------
   Money Market Assets                               $3,196.9      $1,784.2      79.2%
   Securities                                         4,814.9       5,760.3     (16.4)
   Loans and Leases                                  10,937.4       9,906.0      10.4
                                                    ---------     ---------     -----
      Total Earning Assets                           18,949.2      17,450.5       8.6
   Reserve for Credit Losses                           (148.3)       (147.1)      0.8
   Other Nonearning Assets                            2,807.4       2,630.1       6.7
                                                    ---------     ---------     -----
      Total Assets                                  $21,608.3     $19,933.5       8.4%
                                                    =========     =========     =====

Liabilities and Stockholders' Equity
- ------------------------------------
   Total Interest-Bearing Deposits                   $9,908.8      $9,175.3       8.0%
   Borrowed Funds                                     4,910.2       5,181.4      (5.2)
   Notes Payable (incl. Senior Notes)                   732.8         351.6     108.4
                                                    ---------     ---------     -----
      Total Interest-Related Funds                   15,551.8      14,708.3       5.7
   Demand & Other Noninterest-Bearing Deposits        3,887.4       3,312.9      17.3
   Other Liabilities                                    625.0         459.7      35.9
                                                    ---------     ---------     -----
      Total Liabilities                              20,064.2      18,480.9       8.6
   Common Equity                                      1,424.1       1,282.6      11.0
   Preferred Equity                                     120.0         170.0     (29.4)
                                                    ---------     ---------     -----
      Total Liabilities and Stockholders' Equity    $21,608.3     $19,933.5       8.4%
                                                    =========     =========     =====



AVERAGE BALANCE SHEET ($ IN MILLIONS)
- -------------------------------------
                                                              FOURTH QUARTER
                                                    ------------------------------------
                                                       1996          1995      % Change*
                                                    ------------------------------------
Assets
- ------
   Money Market Assets                               $2,197.1      $1,863.0      17.9%
   Securities                                         5,715.7       6,443.5     (11.3)
   Loans and Leases                                  10,832.7       9,662.9      12.1
                                                    ---------     ---------     -----
      Total Earning Assets                           18,745.5      17,969.4       4.3
   Reserve for Credit Losses                           (147.9)       (147.2)      0.5
   Other Nonearning Assets                            2,390.5       2,465.0      (3.0)
                                                    ---------     ---------     -----
      Total Assets                                  $20,988.1     $20,287.2       3.5%
                                                    =========     =========     =====

Liabilities and Stockholders' Equity
- ------------------------------------
   Total Interest-Bearing Deposits                  $10,211.5      $9,263.6      10.2%
   Borrowed Funds                                     4,847.2       4,903.5      (1.1)
   Notes Payable (incl. Senior Notes)                   728.2         894.4     (18.6)
                                                    ---------     ---------     -----
      Total Interest-Related Funds                   15,786.9      15,061.5       4.8
   Demand & Other Noninterest-Bearing Deposits        3,166.9       3,319.0      (4.6)
   Other Liabilities                                    512.8         484.6       5.8
                                                    ---------     ---------     -----
      Total Liabilities                              19,466.6      18,865.1       3.2
   Common Equity                                      1,401.5       1,252.1      11.9
   Preferred Equity                                     120.0         170.0     (29.4)
                                                    ---------     ---------     -----
      Total Liabilities and Stockholders' Equity    $20,988.1     $20,287.2       3.5%
                                                    =========     =========     =====
</TABLE>
<PAGE>
 
                          NORTHERN TRUST CORPORATION
               (Supplemental Consolidated Financial Information)

Quarterly Trend Data ($ In Millions)
- ------------------------------------
<TABLE>
<CAPTION>
                                                                                                               1995
                                                                        1996 Quarters                         Quarter
                                                     ----------------------------------------------------   -----------
                                                       Fourth        Third         Second        First         Fourth
                                                     ----------------------------------------------------   -----------
<S>                                                    <C>           <C>           <C>           <C>        <C>
New Income Summary
- ------------------
   Trust Fees                                          $152.0        $147.7        $148.7        $143.9        $133.6
   Other Noninterest Income                              48.7          46.6          46.5          43.8          41.0
   Net Interest Income (Taxable Equivalent)             108.4         107.2         104.3         102.0         100.7
                                                       ------        ------         -----       -------        ------
      Total Revenue (Taxable Equivalent)                309.1         301.5         299.5         289.7         275.3
   Provision for Credit Losses                            0.5           2.5           4.0           5.0           1.0
   Noninterest Expenses                                 199.9         191.3         191.6         184.0         178.5
                                                       ------        ------         -----       -------        ------
      Pretax Income (Taxable Equivalent)                108.7         107.7         103.9         100.7          95.8
   Taxable Equivalent Adjustment                          7.8           8.4           8.8           8.6           9.0
   Provision for Income Taxes                            33.5          32.8          31.7          30.6          27.3
                                                       ------        ------         -----       -------        ------
      Net Income                                        $67.4         $66.5         $63.4         $61.5         $59.5
                                                       ======        ======         =====       =======        ======

Per Common Share
- ----------------
   Net Income: Primary                                  $0.58         $0.57         $0.54         $0.52         $0.51
               Fully Diluted                             0.58          0.57          0.54          0.52          0.50
   Dividend Declared                                     0.18          0.16          0.16          0.16          0.16
   Book Value (EOP)                                     12.80         12.49         12.21         11.91         11.52
   Market Value (EOP)                                  $36.25        $32.88        $28.88        $27.00        $28.00

Ratios
- ------
   Return on Average Common Equity                      18.79%        18.93%        18.47%        18.35%        18.19%
   Return on Average Assets                              1.28          1.26          1.21          1.19          1.16
   Net Interest Margin                                   2.30          2.26          2.22          2.21          2.22
   Productivity Ratio*                                    155%          158%          156%          157%          154%
   Risk-based Capital Ratios:
      Tier 1                                              8.2           8.4           8.4           9.1           8.8
      Total (Tier 1 + Tier 2)                            11.9          12.3          11.7          12.7          12.5
      Leverage                                            6.4           6.3           6.2           6.1           6.2

Trust Assets ($ in Billions) - EOP
- ----------------------------------
   Corporate                                           $693.7        $641.9        $616.2        $567.1        $544.3
   Personal                                              85.2          80.8          76.7          74.1          69.6
                                                       ------        ------         -----       -------        ------
      Total Trust Assets                               $778.9        $722.7        $692.9        $641.2        $613.9
                                                       ======        ======         =====       ========       ======
   Memo: Managed Assets                                 130.3         124.3         119.9         114.5         105.5

Asset Quality ($ in Millions) - EOP
- -----------------------------------
   Nonaccrual Loans                                     $19.5         $33.3         $38.9         $30.6         $31.9
   Other Real Estate Owned (OREO)                         1.9           4.4           1.6           1.5           1.8
                                                       ------        ------         -----       --------       ------
      Total Nonperforming Assets                        $21.4         $37.7         $40.5         $32.1         $33.7
                                                       ======        ======         =====       ========       ======
      Nonperforming Assets/Loans & OREO                  0.20%         0.35%         0.39%         0.32%         0.34%

      Net Charge-offs                                    $0.6          $2.5          $3.8          $4.9          $1.1
      Net Charge-offs (Annualized) to Avg Loans          0.02%         0.09%         0.15%         0.20%         0.05%

      Reserve for Credit Losses                        $148.3        $147.4        $147.4        $147.2        $147.1
      Reserve to Nonaccrual Loans                         761%          442%          379%          481%          461%
</TABLE>
(*) The productivity ratio is defined as total revenue on a taxable equivalent
    basis before the provision for credit losses, divided by noninterest
    expenses.


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