CORNERSTONE PROPERTIES INC
8-K, 1998-12-01
REAL ESTATE
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                      SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, DC 20549

                                    FORM 8-K
                                 Current Report
     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

               December 1, 1998 (Date of earliest event reported)

                           CORNERSTONE PROPERTIES INC.
             (Exact name of registrant as specified in its charter)

                  NEVADA             0-10421           74-2170858
  (State or other jurisdiction of  (Commission        (IRS Employer
              incorporation)       File Number)    Identification No.)
 
                           Cornerstone Properties Inc.
                                    Tower 56           
                              126 East 56th Street
                               New York, NY 10022
                    (Address of principal executive offices)

                                 (212) 605-7100
                         (Registrant's telephone number,
                              including area code)




<PAGE>

ITEM 5. Other Events

          The press release issued by the Registrant,  dated November 4, 1998, a
          copy of which is  included  with this  Form 8-K as  Exhibit  99.1,  is
          incorporated herein by reference.

ITEM 7. Financial Statements And Exhibits

          (c) Exhibits

                Exhibit 99.1 - Press release, dated  November 4, 1998.

                Exhibit 99.2 - Second Amended and Restated Revolving  Credit and
                    Guaranty  Agreement dated November 3, 1998 among Cornerstone
                    Properties   Inc.   and   Cornerstone   Properties   Limited
                    Partnership  (the  "Borrowers"),  the  subsidiaries  of  the
                    Borrowers  (the  "Guarantors"),  the Lenders,  Bankers Trust
                    Company, The Chase Manhattan Bank and Nationsbank, N.A.



<PAGE>


                                   SIGNATURES

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.

                        CORNERSTONE PROPERTIES INC.
                        (Registrant)

                        By: /s/ John S. Moody
                            -------------------------------------------
                            John S. Moody, President
                            and Chief Executive Officer

                        Date: December 1, 1998

                        By: /s/ Kevin P. Mahoney
                            -------------------------------------------
                            Kevin P. Mahoney, Senior Vice President and
                            Chief Financial Officer

                        Date: December 1, 1998





<PAGE>


EXHIBIT 99.1

                                                                 Execution Copy
          
                CORNERSTONE PROPERTIES INC. CLOSES $550.0 MILLION
                           ACQUISITION LINE OF CREDIT

NEW YORK,  NEW YORK  (NOVEMBER 4, 1998) -- Cornerstone  Properties  Inc.  (NYSE:
CPP), a real estate investment  trust,  announced that a syndicate of banks lead
by BT Alex. Brown,  Chase Securities and NationsBank  Montgomery  Securities has
closed a new,  three-year $550 million  Acquisition Line of Credit. The new Line
of Credit was agreed to on the same terms as the Company's previous $350 million
Line of Credit with the floating  interest rate spread  maintained at 110 to 140
basis points over LIBOR.  Cornerstone will initially draw on the new facility to
fund part of the $1.8 billion merger with William Wilson & Associates.

John S. Moody,  Chairman and Chief Executive Officer of Cornerstone  Properties,
said,  "We are  extremely  pleased  with  the  response  of the bank  market  to
Cornerstone's  request for financing.  In fact, our facility was oversubscribed.
This transaction gave us the opportunity to develop  relationships with a number
of additional  banks,  including  several that had previously had  relationships
with William Wilson & Associates.  We are  particularly  pleased to have secured
the $200  million  increase  on the same terms as the  previous  facility.  This
underlines  Cornerstone's  ability to access  capital in even the most difficult
market  conditions  due to our  focus  on  Class  A  office  properties  and the
extremely high quality of our asset base."

Cornerstone Properties Inc. is a self-administered equity real estate investment
trust (REIT) investing in Class A office  properties in prime locations in major
metropolitan  areas and central  business  districts.  The Company,  through its
subsidiaries,  currently owns 21 Class A office properties throughout the United
States totaling  approximately  11.5 million square feet.  Headquartered  in New
York City,  Cornerstone's  stock is traded on the New York Stock  Exchange under
the ticker symbol CPP.


This press release contains forward-looking statements within the meaning of the
Federal  securities laws.  Forward-looking  statements are inherently subject to
risks and uncertainties,  many of which cannot be predicted with accuracy,  that
could cause the actual  results,  performance or  achievements of Cornerstone to
differ  materially  from those  reflected  in such  forward-looking  statements.
Information  contained in this press release regarding current and future market
conditions is based on  Cornerstone's  assessment  of real estate  markets as of
this date and is subject to the uncertainties inherent in such an assessment. In
particular, but not exclusively,  national and regional economic conditions, the
rate of new  construction,  and demand and supply in a given  market will affect
leasing activity, projected rents and the cost of lease renewals.

                                                                           # # #

FOR MORE INFORMATION ON CORNERSTONE PROPERTIES VISIT CORNERSTONE PROPERTIES' WEB
SITE AT HTTP://WWW.CSTONEPROP.COM



<PAGE>

EXHIBIT 99.2



                           SECOND AMENDED AND RESTATED
                     REVOLVING CREDIT AND GUARANTY AGREEMENT

                                      among

                          CORNERSTONE PROPERTIES INC.,
                              a Nevada corporation

                                       and

                   CORNERSTONE PROPERTIES LIMITED PARTNERSHIP,
                         a Delaware limited partnership,

                                  as Borrowers,

                        THE SUBSIDIARIES OF THE BORROWERS
                                SIGNATORY HERETO,

                                 as Guarantors,

                          THE LENDERS SIGNATORY HERETO,

                                   as Lenders,

                             BANKERS TRUST COMPANY,

                    as Administrative Agent for the Lenders,

                            THE CHASE MANHATTAN BANK

                      as Syndication Agent for the Lenders,

                                       and

                                NATIONSBANK, N.A.

                     as Documentation Agent for the Lenders

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

                          dated as of November 3, 1998

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












                                TABLE OF CONTENTS

                                                                            Page

@@

ARTICLE I DEFINITIONS AND ACCOUNTING MATTERS...................................1

    SECTION 1.1.  Defined Terms................................................1
    SECTION 1.2.  Other Definitional Provisions...............................35
    SECTION 1.3.  Accounting Terms and Determinations.........................35

ARTICLE II AMOUNT AND TERMS OF LOANS..........................................36

    SECTION 2.1.  Commitments and Loans.......................................36
    SECTION 2.2.  Notes.......................................................36
    SECTION 2.3.  Interest....................................................37
    SECTION 2.4.  Borrowing and Conversion Procedures.........................38
    SECTION 2.5.  Special Provisions Governing Eurodollar Rate Loans..........42
    SECTION 2.6   Letters of Credit...........................................43
    SECTION 2.7.  Prepayments; Reduction of Aggregate Commitment..............46
    SECTION 2.8.  Interest on Delinquent Payments.............................47
    SECTION 2.9.  Additional Costs............................................48
    SECTION 2.10. Use of Proceeds.............................................51
    SECTION 2.11. Payment on Non-Business Days................................52
    SECTION 2.12. Funding Losses..............................................52
    SECTION 2.13. Change in Legality..........................................53
    SECTION 2.14. Increase in Aggregate Commitment............................54

ARTICLE III FEES AND PAYMENTS.................................................55

    SECTION 3.1.  Fees........................................................55
    SECTION 3.2.  Payments....................................................55
    SECTION 3.3.  Taxes.......................................................55

ARTICLE IV GUARANTY...........................................................59

    SECTION 4.1.  Guaranty of Payment.........................................59
    SECTION 4.2.  Obligations Unconditional...................................59
    SECTION 4.3.  Modifications...............................................60
    SECTION 4.4.  Waiver of Rights............................................60
    SECTION 4.5.  Reinstatement...............................................61
    SECTION 4.6.  Remedies....................................................61
    SECTION 4.7.  Limitation of Guaranty......................................61
    SECTION 4.8.  Release of Guaranty.........................................61
    SECTION 4.9.  Borrowers...................................................62

ARTICLE V REPRESENTATIONS AND WARRANTIES......................................63

    SECTION 5.1.  Organization and Good Standing..............................63
    SECTION 5.2.  Due Authorization...........................................63
    SECTION 5.3.  No Conflicts................................................63
    SECTION 5.4.  Consents....................................................63
    SECTION 5.5.  Enforceable Obligations.....................................64
    SECTION 5.6.  No Default..................................................64
    SECTION 5.7.  Ownership...................................................64
    SECTION 5.8.  Indebtedness................................................64
    SECTION 5.9.  Litigation..................................................64
    SECTION 5.10. Taxes.......................................................64

                                       (i)

    SECTION 5.11.  Compliance with Law........................................65
    SECTION 5.12.  Subsidiaries...............................................65
    SECTION 5.13.  Use of Proceeds; Margin Stock..............................65
    SECTION 5.14.  Government Regulation......................................65
    SECTION 5.15.  Intellectual Property......................................65
    SECTION 5.16.  Solvency...................................................66
    SECTION 5.17.  Disclosure.................................................66
    SECTION 5.18.  Licenses, etc..............................................66
    SECTION 5.19.  No Burdensome Restrictions.................................66
    SECTION 5.20.  ERISA......................................................66
    SECTION 5.21.  Hazardous Materials; Asbestos..............................67
    SECTION 5.22.  Mortgages..................................................68
    SECTION 5.23.  Federal Tax Matters........................................69
    SECTION 5.24.  Year 2000..................................................69
    SECTION 5.25.  Financial Statements.......................................69

ARTICLE VI CONDITIONS PRECEDENT...............................................70

    SECTION 6.1.   Conditions to Making of Loans..............................70

ARTICLE VII AFFIRMATIVE COVENANTS.............................................75

    SECTION 7.1.   Financial Statements and Other Information.................75
    SECTION 7.2.   Notice of Certain Events...................................78
    SECTION 7.3.   Maintain Existence.........................................80
    SECTION 7.4.   Qualified Income Covenant; Cornerstone Common Stock........80
    SECTION 7.5.   Taxes and Claims...........................................80
    SECTION 7.6.   Insurance..................................................81
    SECTION 7.7.   Books and Records; Fiscal Year.............................81
    SECTION 7.8.   Maintain Properties and Rights.............................81
    SECTION 7.9.   Inspection by Administrative Agent and Lenders; Appraisals.82
    SECTION 7.10.  Pay Indebtedness and Perform Obligations...................82
    SECTION 7.11.  Compliance With Laws.......................................83
    SECTION 7.12.  Environmental Compliance...................................83
    SECTION 7.13.  Further Assurances.........................................86
    SECTION 7.14.  Impositions and Discharge of Liens.........................86
    SECTION 7.15.  Leases and Rents...........................................88
    SECTION 7.16.  Excess Cash Flow...........................................89
    SECTION 7.17.  Acquisition of Properties..................................89
    SECTION 7.18.  Additional Guarantors......................................89
    SECTION 7.19.  Title/Status of Mortgage Loans.............................90
    SECTION 7.20.  Year 2000..................................................91

ARTICLE VIII NEGATIVE COVENANTS...............................................92

    SECTION 8.1.   Liens......................................................92
    SECTION 8.2.   Limitation on Investments..................................93
    SECTION 8.3.   Restricted Payments; Dividend Payout.......................93
    SECTION 8.4.   Working Capital.............................. .............93
    SECTION 8.5.   Equity Value...............................................93
    SECTION 8.6.   Leverage Ratio.............................................93
    SECTION 8.7.   Interest Coverage Ratio....................................93
    SECTION 8.8.   Fixed Charge Coverage Ratio................................94
    SECTION 8.9.   Unencumbered Properties Asset Value........................94
    SECTION 8.10.  Additional Financial Covenants.............................94
    SECTION 8.11.  Indebtedness...............................................95
    
                                      (ii)

    SECTION 8.12.  Asset Sales and Transfers..................................95
    SECTION 8.13.  Certain Capital Transactions and Fundamental Changes.......96
    SECTION 8.14.  Certain Amendments.........................................97
    SECTION 8.15.  Transactions with Affiliates...............................97
    SECTION 8.16.  Management Agreements......................................97
    SECTION 8.17.  Inconsistent Agreements....................................97
    SECTION 8.18.  Maintenance of Corporate Existence.........................97
    SECTION 8.19.  Property Mix..................................... .........98
    SECTION 8.20.  REIT Dividend Covenant.....................................98

ARTICLE IX DEFAULTS AND REMEDIES..............................................99

    SECTION 9.1.   Events of Default..........................................99
    SECTION 9.2.   Suits for Enforcement.....................................104
    SECTION 9.3.   Rights and Remedies Cumulative............................104
    SECTION 9.4.   Rights and Remedies Not Waived............................104
    SECTION 9.5.   Waiver of Stay............................................104
    SECTION 9.6.   Additional Advances and Disbursements.....................105

ARTICLE X MISCELLANEOUS......................................................106

    SECTION 10.1.  Administration and Collection Costs.......................106
    SECTION 10.2.  Modification and Waiver...................................106
    SECTION 10.3.  GOVERNING LAW.............................................108
    SECTION 10.4.  Notices...................................................109
    SECTION 10.5.  Accounting Terms..........................................110
    SECTION 10.6.  Indemnity.................................................111
    SECTION 10.7.  WAIVER OF JURY TRIAL AND SETOFF...........................111
    SECTION 10.8.  Captions..................................................111
    SECTION 10.9.  Lien; Setoff by Lenders...................................112
    SECTION 10.10. Jurisdiction; Service of Process..........................112
    SECTION 10.11. Benefit of Agreement......................................113
    SECTION 10.12. Counterparts..............................................113
    SECTION 10.13. Interest..................................................113
    SECTION 10.14. Attorneys' Fees...........................................114
    SECTION 10.15. Severability..............................................114
    SECTION 10.16. Confidentiality...........................................114
    SECTION 10.17. Loss, Theft, Etc. of Notes................................116
    SECTION 10.18. Replacement of Lender.....................................116
    SECTION 10.19. Entire Agreement..........................................116
    SECTION 10.20. Consent to Amendment and Restatement......................116

ARTICLE XI AGENCY............................................................117

    SECTION 11.1.  Appointment and Actions...................................117
    SECTION 11.2.  Independent Credit Decisions..............................119
    SECTION 11.3.  Indemnification of Agents.................................120
    SECTION 11.4.  Resignation and Succession................................121

ARTICLE XII SALES AND TRANSFERS..............................................123

    SECTION 12.1.  Sales and Transfers.......................................123

                                     (iii)




                  EXHIBITS, SCHEDULES AND DISCLOSURE SCHEDULES

@@
        EXHIBIT                                             DESCRIPTION

================================================================================
@@
A                 Lenders and Commitment Amounts
B                 Form of Note
C                 Form of Loan Request
D                 Form of Continuation Request
E                 Form of Assignment and Acceptance
F                 Form of Rent Roll
G                 Form of Letter of Credit Request
H                 Form of Compliance Certificate
I                 Form of Pledge Agreement

SCHEDULES                  DESCRIPTION

1.1(a)            Lists of Authorized Officers
1.1(b)            Existing Properties
1.1(c)            Existing Ground Leases
1.1(d)            Execution Date Unencumbered Properties

DISCLOSURE
SCHEDULES                  DESCRIPTION

5.7               Preexisting Liens
5.8               Preexisting Indebtedness
5.12              Subsidiaries
5.20              Certain ERISA matters
5.21              Certain environmental matters
7.18(a)           Certain non-guarantor Subsidiaries
7.18(b)           WWA Collateral Properties





     This SECOND AMENDED AND RESTATED  REVOLVING CREDIT AND GUARANTY  AGREEMENT,
dated as of November 3, 1998, is by and among: (i) CORNERSTONE  PROPERTIES INC.,
a  corporation  duly  organized  and validly  existing  under the laws of Nevada
("Cornerstone");  (ii) CORNERSTONE  PROPERTIES LIMITED  PARTNERSHIP,  a Delaware
limited   partnership   ("Cornerstone   LP";  together  with  Cornerstone,   the
"Borrowers,"  and each a  "Borrower");  (iii) each of the  direct  and  indirect
Subsidiaries of the Borrowers that is a signatory  hereto  identified  under the
caption  "GUARANTORS" on the signature pages hereto;  (iv) each of the financial
institutions  that is a signatory hereto  identified under the caption "LENDERS"
on the signature  pages hereto or that,  pursuant to SECTION 12.1 hereof,  shall
become a "Lender" hereunder  (individually,  a "Lender" and,  collectively,  the
"Lenders");  (v) BANKERS TRUST COMPANY, as Administrative  Agent for the Lenders
hereunder  (in such  capacity,  the  "Administrative  Agent");  (vi)  THE  CHASE
MANHATTAN  BANK,  as  Syndication  Agent  for the  Lenders  hereunder  (in  such
capacity,   the  "Syndication   Agent");   and  (vii)   NATIONSBANK,   N.A.,  as
Documentation  Agent for the Lenders hereunder (the  "Documentation  Agent," and
together with the Administrative Agent and the Syndication Agent, the "Agents").

     WHEREAS, pursuant to that certain Amended and Restated Revolving Credit and
Guaranty Agreement, dated as of January 20, 1998, among Cornerstone, Cornerstone
LP, the guarantors  signatory thereto (the "Existing  Guarantors"),  the lenders
signatory  thereto  (the  "Existing   Lenders"),   Bankers  Trust  Company,   as
Administrative  Agent,  and The Chase Manhattan Bank, as Syndication  Agent (the
"Existing Credit Agreement"), the Existing Lenders have agreed to make revolving
loans to Cornerstone and Cornerstone LP in an aggregate  principal amount not to
exceed $350,000,000; and

     WHEREAS,  the parties hereto wish to amend and restate the Existing  Credit
Agreement to, inter alia,  increase the amount of the facility,  and  substitute
the Lenders for the Existing Lenders as Lenders under this Agreement;

     NOW,  THEREFORE,  the parties hereto hereby agree that, the Existing Credit
Agreement shall be and hereby is amended in its entirety as follows:

                                    ARTICLE I
                       DEFINITIONS AND ACCOUNTING MATTERS

                  SECTION 1.1.  Defined Terms.

     As used  in this  Agreement,  the  terms  defined  in the  declaration  and
recitals  hereto shall have the  respective  meanings  ascribed  thereto in said
declaration  and  recitals,  and the  following  terms shall have the  following
respective meanings:

     "ABR Loan"  shall mean a Loan which shall bear  interest  at the  Alternate
Base Rate.

     "Adjusted  EBITDA" shall mean, for the Loan Parties and their  Subsidiaries
for any period, (i) EBITDA plus/minus (ii) the Operating Income Adjustment.

     "Adjusted   Eurodollar   Rate"  shall  mean,   as  of  any  Interest   Rate
Determination  Date with respect to a Eurodollar  Rate Loan,  the rate per annum
obtained by dividing (i) the London Interbank  Offered Rate by (ii) a percentage
equal to 100% minus the Eurodollar Reserve Percentage.

     "Affiliate" shall mean any Person that, directly or indirectly, controls or
is controlled by or is under common control with any other Person.  For purposes
of this definition,  "control" (including,  with correlative meanings, the terms
"controlled  by" and "under common control  with"),  as used with respect to any
Person,  shall mean the  possession,  directly  or  indirectly,  of the power to
direct or cause the  direction  of the  management  and policies of such Person,
whether  through the  ownership of Voting  Interests,  by contract or otherwise.
Notwithstanding the foregoing, (i) no individual shall be an Affiliate of a Loan
Party  solely by reason of his or her being a  director,  officer or employee of
the Loan Parties or any of their  Subsidiaries and (ii) none of the Subsidiaries
of either Borrower shall be Affiliates of any Loan Party.

     "Aggregate  Commitment" shall mean (i) $530,000,000 plus (ii) the aggregate
amount of all  Increased  Commitments  effected  pursuant to SECTION 2.14 hereof
minus (iii) the aggregate amount of all optional  reductions by the Loan Parties
under SECTION 2.7(C) in permanent reduction of the Aggregate Commitment.

     "Agreement"  shall mean this Second Amended and Restated  Revolving  Credit
and Guaranty Agreement, as the same may be amended and supplemented from time to
time.

     "Alternate  Base Rate" shall  mean,  as of any date of  determination,  the
greater of (i) the annual rate of interest  announced by Bankers  Trust  Company
from time to time as its "prime rate" in effect at its  principal  office in New
York,  New York at 5:00 p.m.,  New York City time (the "Prime  Rate"),  for such
date,  and (ii) the  Federal  Funds  Rate  plus 50 basis  points.  Such  rate of
interest  shall be  computed on the basis of a 365-day or 366-day  year,  as the
case may be, for the actual  number of days elapsed and shall change when and as
the Prime Rate is changed,  and any such change in the Alternate Base Rate shall
become  effective  at the opening of business on the day on which such change is
adopted.

                                      -2-


     "Applicable Lending Office" shall mean, for each Lender, the office of such
Lender  (or of an  Affiliate  of such  Lender) to which  notices  are to be sent
unless a different  "Lending  Office" is  designated on EXHIBIT A hereto or such
other  office of such Lender (or of an  Affiliate of such Lender) as such Lender
from time to time by written notice may specify to the Administrative  Agent and
the Loan Parties as the office by which its Loans are to be made and maintained.

     "Applicable Margin" shall mean:

     (i) for any date of  calculation  during any period  during  which  neither
Borrower  has  received a Minimum Long Term Debt Rating or during which all such
ratings have been withdrawn by the applicable rating agency, the number of basis
points ("bps") per annum  opposite the Leverage Ratio  (calculated as of the end
of the immediately  preceding  fiscal quarter) set forth in the grid below under
the  caption  "Applicable  Eurodollar  Margin" or  "Applicable  Unused  Line Fee
Margin," as the case may be:

                                 Applicable                Applicable
         Leverage Ratio       Eurodollar Margin      Unused Line Fee Margin
         --------------       -----------------      ----------------------
              <.3                 110 bps                   15 bps

          >.3 but <.45            125 bps                   15 bps

              >.45                140 bps                   20 bps;

         and

     (ii) for any date of  calculation  during any  period  after  which  either
Borrower  has  received a Minimum  Long Term Debt  Rating and during  which such
Borrower  maintains  such  Minimum  Long Term Debt  Rating,  the number of basis
points ("bps") per annum opposite such Borrower's  Minimum Long Term Debt Rating
set forth in the grid below under the caption "Applicable  Eurodollar Margin" or
"Applicable Unused Line Fee Margin," as the case may be; provided,  however,  if
either  Borrower  has received a Minimum Long Term Debt Rating from both S&P and
Moody's and has been split-rated,  the number of basis points per annum opposite
the higher of the two ratings will be used,  unless the discrepancy is more than
one  level,  in which case the number of basis  points  per annum  opposite  the
rating  corresponding to the average of the two ratings will be used;  provided,
further, that if a Minimum Long Term Debt Rating shall be changed (other than as
a result of a change in the rating system of Moody's or S&P),  such change shall
be  effective as of the date on which it is first  announced  by the  applicable
rating agency:

                                      -3-


         Minimum Long Term         Applicable                 Applicable
         Debt Rating            Eurodollar Margin       Unused Line Fee Margin
         -----------            -----------------       ----------------------

          > A-/A3                     75 bps                    12.5 bps

          > BBB+/Baa1                 90 bps                    12.5 bps
          but < A-/A3

          > BBB/Baa2                 100 bps                    15.0 bps
          but < BBB+/Baa1

          > BBB-/Baa3                110 bps                    15.0 bps
          but < BBB/Baa2

     "Appraisal"  shall mean a written  appraisal  of property  requested by the
Administrative  Agent  pursuant  to  Section  7.9(B)  (i) in form,  content  and
methodology  satisfactory to the Administrative Agent and in compliance with all
applicable  legal  and  regulatory   requirements,   and  (ii)  prepared  by  an
independent  appraiser  selected  by the  Administrative  Agent  who  meets  all
regulatory  requirements  applicable to the Administrative Agent and the Lenders
and, in the case of an Appraisal of a Property, has at least 10 years experience
with  real  estate  of the  same  type and in the  same  geographic  area as the
Property to be appraised.

     "Assignee" or "Assignees"  shall have the meaning set forth in SECTION 12.1
hereof.

     "Assignment" or  "Assignments"  shall have the meaning set forth in SECTION
12.1 hereof.

     "Authorized  Officers" shall mean,  with respect to any Loan Party,  one or
more of the  individuals  named on SCHEDULE 1.1(A) hereto under the name of such
Loan Party and any other  individual  hereafter  designated as such from time to
time by such Loan Party in a writing delivered to the Administrative Agent. Each
Authorized   Officer  is  deemed  to  be  a  Person  who  is  charged  with  the
administration of the transactions  contemplated by this Agreement and the other
Facility  Documents and to be authorized to act on behalf of the applicable Loan
Party hereunder and under the other Facility Documents.

     "Bankruptcy  Code"  shall  mean the  Federal  Bankruptcy  Code of 1978,  as
amended from time to time.

     "Board" shall mean the Board of Governors of the Federal Reserve System, or
any Person  that  hereafter  shall  succeed to its  duties  with  respect to the
regulation of margin credits or the  establishment  of reserve  requirements for
commercial banks.

                                      -4-


     "Business  Day" shall mean any day other than a  Saturday,  Sunday or other
day on which  commercial banks in New York, New York, are authorized or required
to close.

     "Capital  Expenditures"  shall  mean,  for any Person for any  period,  the
aggregate (without  duplication) of all expenditures (whether payable in cash or
other property or accrued as a liability (but without  duplication)  during such
period  that,  in  conformity  with GAAP,  are  required  to be  included  in or
reflected by such Person's or any of its  Subsidiaries'  fixed asset accounts as
reflected in any of their respective balance sheets; PROVIDED,  HOWEVER, that in
the case of the Borrowers and their  Subsidiaries,  Capital  Expenditures  shall
include the sum of all  expenditures  by the  Borrowers  and their  Subsidiaries
(including the Ratable Share of the expenditures of such Persons' Unconsolidated
Affiliates) for tenant  improvements,  leasing  commissions,  and Property level
capital expenditures (e.g. roof replacement,  parking lot repairs, etc., but not
capital  expenditures  in  connection  with  expansions  or revenue  enhancement
capital expenditures).

     "Capital   Expenditure   Deduction"   shall   mean,   as  of  any  date  of
determination,  the greater of (i) an amount per annum equal to $1.25 multiplied
by the number of rentable square feet of the Properties; and (ii) the sum of (a)
an amount equal to $0.05 multiplied by the number of rentable square feet of the
Properties, and (b) the product of (x) the average expenditure by any Loan Party
or any of its  Subsidiaries or  Unconsolidated  Affiliates (and expressly not to
include  expenditures paid by tenants) per rentable square foot for space leased
at  the  Properties  over  the  immediately   preceding  four  fiscal  years  of
Cornerstone  for  tenant  improvements  and  leasing  commissions  and  (y)  the
aggregate  number of rentable square feet of the Properties  vacant or scheduled
to become vacant over the next  succeeding four fiscal quarters of the Borrowers
as a result of expiration or termination of leases.

     "Capital Interest" shall mean, with respect to (i) any corporation,  common
stock,  preferred  stock, and any and all shares or other  equivalents  (however
designated) of any other corporate stock, of such corporation,  (ii) any limited
liability company,  membership or ownership interests in such company, and (iii)
any partnership,  partnership interests (whether general, special or limited) in
such partnership.

     "Capital Lease  Obligations" shall mean, for any Person, all obligations of
such Person to pay rent or other  amounts  under a lease of (or other  agreement
conveying the right to use) property to the extent such obligations are required
to be classified and accounted for as a capital lease on a balance sheet of such
Person  under GAAP,  and,  for  purposes of this  Agreement,  the amount of such
obligations  shall be the capitalized  amount thereof,  determined in accordance
with GAAP.

                                      -5-


     "CERCLA" shall have the meaning  ascribed to such term in the definition of
"Hazardous Materials".

     "Code"  shall mean the  Internal  Revenue  Code of 1986,  and all rules and
regulations  promulgated  pursuant  thereto,  as  the  same  may be  amended  or
supplemented from time to time.

     "Combined  Adjusted NOI" shall mean,  with respect to the  applicable  time
period,  as to any  Properties,  a  dollar  amount  equal  to the sum of (i) the
aggregate NOI for such Properties plus/minus (ii) the aggregate Operating Income
Adjustment for such Properties.

     "Commitment"  shall mean, with respect to any Lender, the amount designated
for such Lender on EXHIBIT A hereto.

     "Consolidated  Fixed Charges"  shall mean, as at any date of  determination
for any period, the sum of (x) each of the following,  without duplication,  for
the Loan Parties and their  Subsidiaries,  on a consolidated basis, plus (y) the
Loan Parties' and their  Subsidiaries'  Ratable Share of each of the  following,
without duplication,  of such Persons' Unconsolidated  Affiliates:  (i) Interest
Expense  for such  period,  (ii)  scheduled  principal  amortization  (excluding
balloon  principal  payments  due at  maturity)  arising  during  such period on
Indebtedness,  and (iii) all dividends  authorized or paid during such period on
any  issue of  Cornerstone  Preferred  Stock  (annualized  in the case of the 7%
cumulative convertible preferred stock of Cornerstone,  no par value, issued and
outstanding  on the Initial  Funding  Date and any other  Cornerstone  Preferred
Stock providing for the payment of dividends less frequently than quarterly).

     "Consolidated   Total   Liabilities"   shall  mean,   as  at  any  date  of
determination,  the sum of (x) each of the following,  without duplication,  for
the Loan Parties and their  Subsidiaries,  on a consolidated basis, plus (y) the
Loan Parties' and their  Subsidiaries'  Ratable Share of each of the  following,
without  duplication,  of  such  Persons'  Unconsolidated  Affiliates:  (i)  all
indebtedness for borrowed money, (ii) any obligation owed for all or any part of
the deferred  purchase  price of assets or services which would be shown to be a
liability (or on the  liability  side of the balance  sheet) in accordance  with
GAAP, (iii) all Contingent  Obligations,  (iv) the maximum amount of all letters
of credit issued or acceptance  facilities  established  for the account or upon
the application of the Loan Parties or any of their  Subsidiaries,  and, without
duplication,  all drafts  drawn  thereunder  (other  than  letters of credit (A)

                                      -6-


supporting other  indebtedness of the Loan Parties or any such Subsidiary or any
Affiliate  of a  Borrower,  or (B)  offset  by a like  amount  of  cash  or cash
equivalents  held  in  escrow  to  secure  such  letters  of  credit  and  draws
thereunder),  (v) all Capital Lease  Obligations,  (vi) all  indebtedness (A) of
another Person secured by any Lien on any property or asset owned or held by the
Loan Parties or any of their Subsidiaries regardless of whether the indebtedness
secured  thereby shall have been assumed by the Loan Parties or such  Subsidiary
or is nonrecourse to the credit of the Loan Parties or such Subsidiary,  and (B)
of any consolidated Affiliate of a Borrower whether or not such indebtedness has
been assumed by such Borrower,  (vii) indebtedness  created or arising under any
conditional  sale or title  retention  agreement  with  respect to any  property
acquired by the Loan Parties or any of their Subsidiaries, and (viii) withdrawal
liability or  insufficiency  under ERISA or under any qualified  plan or related
trust; but including  within the foregoing,  trade payables and accrued expenses
arising or incurred in the ordinary course of business.

     "Construction in Process" shall mean Properties as to which, as of any date
of  determination,  the Borrowers,  any of their  Subsidiaries,  or any of their
Unconsolidated Affiliates are engaged in construction,  renovation, or expansion
(other than in the ordinary course of business).

     "Contingent   Obligation"   shall  mean,  for  any  Person,   any  material
commitment,  undertaking,  guaranty or other material obligation  constituting a
contingent  liability  under  GAAP,  and shall  include  actual net  obligations
payable by such Person upon  termination  of interest rate swap  agreements  and
currency agreements.

     "Continuation  Request"  shall  mean a  request  for  the  continuation  of
Eurodollar Rate Loans for one or more Interest  Periods,  in  substantially  the
form of EXHIBIT D hereto,  executed  by an  Authorized  Officer on behalf of the
applicable Borrower.

     "Cornerstone Common Stock" shall mean the common stock of Cornerstone,  par
value $.01 per share.

     "Cornerstone  Preferred  Stock"  shall  mean,  collectively,   (i)  the  7%
cumulative  convertible  preferred stock of Cornerstone,  no par value, and (ii)
the shares of any other series or class of preferred stock issued by Cornerstone
from and after the Initial Funding Date.

     "Cornerstone   Proxy   Statement"   shall  mean  the  Proxy   Statement  of
Cornerstone,  dated September 23, 1997, in connection with the Notice of Special
Meeting of Stockholders to Cornerstone, dated September 23, 1997.

                                      -7-


     "Current   Assets"   shall  mean,   for  any  Person  as  at  any  date  of
determination,  total assets of such Person which may be properly  classified as
current assets in conformity with GAAP.

     "Current  Liabilities"  shall  mean,  for  any  Person  as at any  date  of
determination, total liabilities of such Person which may be properly classified
as current liabilities in conformity with GAAP.

     "Default"  shall mean any of the events  specified  in SECTION  9.1 hereof,
whether or not any requirement  for the giving of notice,  the lapse of time, or
both, or any other condition, has been satisfied.

     "Default  Rate"  shall mean (i) for each ABR Loan,  an annual rate equal to
the sum of (A)  4.0%  plus  (B) the  Alternate  Base  Rate,  and  (ii)  for each
Eurodollar Rate Loan, (x) during the period to and including the last day of the
Interest  Period for such Loan, an annual rate equal to the sum of (A) 4.0% plus
(B) the  Adjusted  Eurodollar  Rate  plus  (C) the  Applicable  Margin,  and (y)
commencing the first day after the end of such Interest Period for such Loan, an
annual rate equal to the sum of (A) 4.0% plus (B) the Alternate Base Rate.

     "Designated Pledged  Subsidiary" shall mean an Unconsolidated  Affiliate of
Cornerstone LP (i) which is designated by  Cornerstone LP to the  Administrative
Agent  on or  before  the  Initial  Funding  Date  as  the  "Designated  Pledged
Subsidiary,"  (ii) which owns no  Properties,  (iii) the  principal  business of
which is to own and perform management,  leasing, development, and other similar
service contracts between itself and the Loan Parties and their Subsidiaries and
between itself and affiliated and non-affiliated  third parties,  and (iv) which
shall be the sole  Unconsolidated  Affiliate of the  Borrowers  whose  principal
business  is to own and  perform  management,  leasing,  development,  and other
similar  service  contracts  between  itself  and the  Loan  Parties  and  their
Subsidiaries and between itself and affiliated and non-affiliated third parties.

     "DIHC" shall mean Dutch  Institutional  Holding  Company,  Inc., a Delaware
corporation.

     "DIHC Purchase  Money Notes" shall mean the  promissory  notes issued under
that certain Note and Collateral Agency Agreement, dated as of November 1, 1997,
among Cornerstone,  certain of its Subsidiaries party thereto, the lenders party
thereto,  and PGGM,  as  Administrative  Agent,  as the same may be  amended  or
modified from time to time.

                                      -8-


     "Dividends"  shall have the meaning ascribed to such term in the definition
of "Restricted Payments" herein.

     "Dollars"  and "$" shall  mean  lawful  currency  of the  United  States of
America.

     "EBITDA" shall mean, for any Person for any period,  the sum of the amounts
for such Person  (including  the Ratable  Share of the  following  items of such
Person's  Unconsolidated  Affiliates)  for such period of (i) Net  Income,  (ii)
Interest  Expense,  (iii)  provisions  for taxes  based on  income,  (iv)  total
depreciation  expense,  (v) total amortization  expense,  (vi) any extraordinary
losses,  and  (vii)  minority   interests  in  Subsidiaries,   less  (viii)  any
extraordinary  gains, all of the foregoing as determined on a consolidated basis
for the  Borrower  and its  Subsidiaries  in  conformity  with  GAAP;  PROVIDED,
HOWEVER,  EBITDA  attributable to management,  leasing,  development,  and other
similar service contracts between the Designated Pledged Subsidiary and the Loan
Parties and affiliated and non-affiliated third parties shall be limited for any
period to the lesser of (X) $10,000,000  and (Y) the actual EBITDA  attributable
to management, leasing, development, and other similar service contracts between
the  Designated  Pledged  Subsidiary  and the Loan  Parties and  affiliated  and
non-affiliated third parties.

     "Eligible  Assignee"  shall mean  (i)(a) a  commercial  bank  organized  or
licensed to conduct a banking  business  under the laws of the United  States of
America or any state thereof; (b) a savings and loan association or savings bank
organized  under the laws of the United States of America or any state  thereof;
(c) a  commercial  bank  organized  under the laws of any other  country  or any
political  subdivision  thereof,  PROVIDED,  HOWEVER,  that  (x)  such  bank  is
organized under the laws of a country that is a member of the  Organization  for
Economic Cooperation and Development (the "OECD") or a political  subdivision of
such a country,  and (y) such bank is acting  through a branch or agency located
in the  country  in which it is  organized  or another  country  which is also a
member of the OECD or the Cayman  Islands;  and (d) any other entity (other than
an individual, a bank or a savings and loan association) which is an "accredited
investor"  as defined in clause  (1),  (2),  (3),  or (7) of Section  230.501 of
Regulation D under the  Securities Act and which extends credit or buys loans as
one of its  principal  businesses  including,  but  not  limited  to,  insurance
companies,  investment banks,  mutual funds, and lease financing  companies,  in
each case  (under  clauses (a)  through  (d) above)  that is  acceptable  to the
Administrative  Agent  (which  acceptance  shall not be  unreasonably  withheld,
conditioned  or  delayed);  and (ii) any Lender and any  Affiliate  of a Lender;
PROVIDED,  FURTHER,  that each Eligible  Assignee  under clauses  (i)(a) through
(i)(c) above (x) shall have Tier 1 capital (as defined in the regulations of its
primary Federal banking regulator) of not less than $100,000,000,  and (y) shall
have   total   assets   in   excess  of   $5,000,000,000;   PROVIDED,   FURTHER,
notwithstanding anything to the contrary provided herein, neither any Loan Party
nor any Affiliate of a Loan Party may be an Eligible Assignee.

                                      -9-


     "Employee  Benefit Plan" shall mean any "employee  benefit plan" as defined
in Section 3(3) of ERISA which is, or was at any time, maintained or contributed
to by a Borrower or any of its ERISA Affiliates.

     "Equity  Proceeds"  shall  mean  the  cash  proceeds  (net of  underwriting
discounts  and  commissions  and other  reasonable  costs  associated  therewith
(including,  without limitation,  legal fees, brokerage  commissions,  and taxes
payable  as a  result  of or in  connection  with  such  transaction))  from the
issuance of any equity securities of the Borrowers or any of their Subsidiaries,
including (a)  additional  issuances of  Cornerstone  Common Stock,  and (b) the
issuance of any interests or units in Cornerstone LP.

     "Equity Value" shall mean, as of any date of determination,  Total Property
Asset Value minus Consolidated Total Liabilities.

     "ERISA" shall mean the Employee  Retirement Income Security Act of 1974, as
amended from time to time, and all rules and regulations promulgated thereunder.

     "ERISA  Affiliate"  shall  mean  each  trade or  business  (whether  or not
incorporated)  which,  together  with a Borrower or  Borrowers,  is treated as a
single employer under Sections 414(b), (c), (m) or (o) of the Code.

     "ERISA  Event" shall mean (i) a  "reportable  event"  within the meaning of
Section 4043 of ERISA and the regulations  issued thereunder with respect to any
Pension Plan  (excluding  those for which the provision for 30-day notice to the
PBGC has been  waived  by  regulation),  (ii) the  failure  to meet the  minimum
funding  standard  of Section 412 of the Code with  respect to any Pension  Plan
(whether or not waived in  accordance  with  Section  412(d) of the Code) or the
failure to make by its due date a required  installment  under Section 412(m) of
the Code with  respect to any Pension  Plan or the failure to make any  required
contribution to a Multiemployer  Plan, (iii) the provision by the  administrator
of any  Pension  Plan  pursuant  to Section  4041(a)(2)  of ERISA of a notice of
intent to  terminate  such plan in a distress  termination  described in Section
4041(c)  of  ERISA,  (iv)  the  withdrawal  by a  Borrower  or any of its  ERISA
Affiliates from any Pension Plan with two or more  contributing  sponsors or the

                                      -10-


termination of any such Pension Plan resulting in liability  pursuant to Section
4063  or 4064 of  ERISA,  (v) the  institution  by the  PBGC of  proceedings  to
terminate any Pension Plan,  or the  occurrence of any event or condition  which
might constitute  grounds under ERISA for the termination of, or the appointment
of a trustee to administer,  any Pension Plan,  (vi) the imposition of liability
on a Borrower or any of its ERISA Affiliates pursuant to Section 4062(e) or 4069
of ERISA or by reason of the application of Section 4212(c) of ERISA,  (vii) the
withdrawal by a Borrower or any of its ERISA Affiliates in a complete or partial
withdrawal  (within  the  meaning  of Section  4203 and 4205 of ERISA)  from any
Multiemployer Plan if there is any potential liability therefor,  or the receipt
by a Borrower or any of its ERISA  Affiliates  of notice from any  Multiemployer
Plan that it is in reorganization or insolvency pursuant to Section 4241 or 4245
of ERISA, or that it intends to terminate or has terminated  under Section 4041A
or 4042 of ERISA,  (viii) the  occurrence of an act or omission which could give
rise to the  imposition  on a Borrower or any of its ERISA  Affiliates of fines,
penalties,  taxes  or  related  charges  under  Chapter  43 of the Code or under
Section  409 or 502(c),  (i) or (l) or 4071 of ERISA in respect of any  Employee
Benefit Plan,  (ix) the assertion of a material claim (other than routine claims
for benefits) against any Employee Benefit Plan other than a Multiemployer  Plan
or the assets thereof,  or against a Borrower or any of its ERISA  Affiliates in
connection  with any such Employee  Benefit Plan,  (x) receipt from the Internal
Revenue  Service  of notice of the  failure  of any  Pension  Plan (or any other
Employee Benefit Plan intended to be qualified under Section 401(a) of the Code)
to qualify under Section 401(a) of the Code, or the failure of any trust forming
part of any Pension Plan to qualify for exemption  from  taxation  under Section
501(a)  of the  Code,  or (xi) the  imposition  of a Lien  pursuant  to  Section
401(a)(29)  or 412(n)  of the Code or  pursuant  to ERISA  with  respect  to any
Pension Plan.

     "Eurodollar  Business  Day" shall mean a Business Day on which  dealings in
Dollar deposits are carried out in the London interbank market.

     "Eurodollar Rate Loan" shall mean any Loan other than an ABR Loan.

     "Eurodollar  Reserve  Percentage"  shall mean, for any Interest  Period for
which Eurodollar Rate Loans are  outstanding,  the average maximum rate at which
reserves (including, without limitation, any marginal, supplemental or emergency
reserves)  are  required to be  maintained  during such  Interest  Period  under
Regulation D of the Board of Governors of the Federal  Reserve  System by member
banks of the Federal Reserve System in New York City with deposits exceeding one

                                      -11-


billion  Dollars  against  "Eurocurrency  liabilities"  (as such term is used in
Regulation D of the Board of Governors of the Federal Reserve  System).  Without
limiting the effect of the foregoing,  the Eurodollar  Reserve  Percentage shall
include any other  reserves  required to be  maintained  by such member banks by
reason of any Regulatory Change with respect to (i) any category of liabilities,
including  deposits by reference to which the Adjusted  Eurodollar Rate is to be
determined as provided in the definition of "Adjusted  Eurodollar  Rate" in this
SECTION  1.1, or (ii) any  category  of  extensions  of credit or other  assets,
including Eurodollar Rate Loans.

     "Event of Default" shall mean any of the events or conditions  specified as
such in SECTION 9.1 hereof.

     "Excess Cash Flow" shall have the meaning  ascribed to such term in SECTION
7.16 hereof.

     "Exchange Act" shall mean the Securities Exchange Act of 1934, as amended.

     "Execution  Date" shall mean the date on which fully executed  counterparts
of this Agreement shall have been  unconditionally  delivered to and received by
the Administrative Agent.

     "Existing Properties" shall mean, collectively,  the real properties listed
on SCHEDULE 1.1(B) hereto.

     "Facility"  shall mean the undertaking and agreement of the Lenders to make
Loans to the Borrowers in an amount not to exceed the Aggregate  Commitment upon
the terms and conditions set forth herein.

     "Facility  Availability"  shall mean, as of any date of  determination,  an
amount  equal  to  (i)  the  Aggregate  Commitment,  minus  (ii)  the  aggregate
outstanding  principal  amount  of the  Loans,  minus  (iii)  Letter  of  Credit
Obligations.

     "Facility  Documents"  shall  mean  and  include  the  following:  (i) this
Agreement,  (ii) the  executed  Notes,  (iii) the  Pledge  Agreement,  (iv) such
additional  documents,  instruments,  agreements  and  certificates  as  may  be
required  by the terms of any other  Facility  Document,  as the  Administrative
Agent may reasonably  require or as any Lender may reasonably  require,  (v) all
other documents,  instruments and agreements  hereafter entered into by any Loan
Party or Loan Parties with the Administrative  Agent or the Administrative Agent
and the Lenders which, by its terms, states that it is a "Facility Document" for

                                      -12-


the purposes of this Agreement,  and (vi) all amendments and supplements to, and
all  documents  and  instruments  entered into in  substitution  for, any of the
foregoing.

     "Federal Funds Rate" shall mean,  for any day, a rate per annum  (expressed
as a decimal,  rounded  upwards,  if necessary,  to the next higher 1/100 of 1%)
equal  to  the  weighted  average  of  the  rates  on  overnight  federal  funds
transactions  with  members of the Federal  Reserve  System  arranged by federal
funds brokers on such day, as published by the Federal  Reserve Bank of New York
on the Business Day next succeeding such day; PROVIDED, HOWEVER, that (i) if the
day for which such rate is to be  determined  is not a Business Day, the Federal
Funds  Rate for such day  shall be such  rate on such  transactions  on the next
preceding  Business Day as so published on the next succeeding  Business Day and
(ii) if such rate is not so published  for any day,  the Federal  Funds Rate for
such  day  shall  be the  average  of  the  quotations  for  such  day  on  such
transactions  received by the Administrative Agent. The Federal Funds Rate shall
be reset on a daily basis in accordance with the above procedures.

     "Fee Letter"  shall mean the letter  agreement,  dated  September 22, 1998,
among the Borrowers,  Bankers Trust Company, BT Alex. Brown Incorporated,  Chase
Securities Inc., The Chase Manhattan Bank, Nationsbanc Montgomery Securities LLC
, and NationsBank, N.A.

     "Funding Date" shall mean the date of the funding of a Loan.

     "Funds Available for Distribution"  shall mean, as to any period, an amount
equal to the sum of (i)  Funds  From  Operations  for such  period,  minus  (ii)
historically  recurring  Capital  Expenditures  incurred by the Loan Parties and
their  Subsidiaries  during  such  period,  minus (iii)  Restricted  Payments to
holders of Cornerstone Preferred Stock.

     "Funds From  Operations"  shall mean, as to any period,  an amount equal to
the sum of (i) Net Income for such period, excluding gains (or losses) from debt
restructuring  and sales of property,  plus (ii)  depreciation and amortization,
plus (iii)  payments of principal  received by the Borrowers  under that certain
amended and restated  promissory  note,  dated as of January 1, 1986,  issued by
Hines Colorado Limited, a Colorado limited partnership, as maker to Cornerstone,
as payee, and after  adjustments for  Unconsolidated  Affiliates,  determined in
each case on a  consolidated  basis in  accordance  with GAAP.  Adjustments  for
Unconsolidated Affiliates will be calculated to reflect funds from operations on
the same basis.

                                      -13-


     "GAAP" shall mean generally  accepted  accounting  principles in the United
States of America, as in effect from time to time, but subject to the provisions
of SECTION 1.2 hereof.

     "Governmental Authority" shall mean (i) any nation or government,  (ii) any
state or other  political  subdivision  thereof,  (iii) any  entity  or  officer
exercising  executive,  legislative,   judicial,  regulatory  or  administrative
functions of or pertaining to  government,  (iv) any court or arbitrator  having
jurisdiction  over any Loan Party or any of its Subsidiaries or Properties,  and
(v) any  corporation or other entity owned or controlled  (through  ownership of
Capital Interests or otherwise) by any of the foregoing.

     "Ground Lease" shall mean a leasehold interest in land and the Improvements
thereon.  The Ground Leases of the Borrowers  and their  Subsidiaries  as of the
Execution Date are described in SCHEDULE 1.1(C) hereto.

     "Guaranteed Obligations" shall mean:

     (i) the payment, as and when due, or by stated maturity,  acceleration,  or
otherwise,  of the Notes and all other  amounts due and payable  under the other
Facility Documents to the Agents and the Lenders at such times and in the manner
provided for in the Facility  Documents,  including  interest  accruing from and
after the date of the  commencement of a bankruptcy case against a Borrower or a
Guarantor, and

     (ii) the  payment  of all  other  obligations  of the  Borrowers  under the
Facility Documents that can be performed by the payment of monies, either to the
Agents  and the  Lenders  directly  or by  reimbursement  of  advances  by them,
including,  without  limitation,  the  payment of income and other  taxes by the
Borrowers.

     "Guarantors"  shall mean,  collectively,  (i) the Guarantors as of the date
hereof, and (ii) all Persons who become Guarantors subsequent to the date hereof
pursuant to SECTION 7.18 hereof.

     "guaranty"  shall mean,  as to any Person,  any  obligation  of such Person
directly or indirectly  guaranteeing  any Indebtedness of any other Person or in
any manner  providing for the payment of any Indebtedness of any other Person or
otherwise  protecting the holder of such  Indebtedness  against loss (whether by
virtue of operation of partnership  law or the terms of partnership  agreements,

                                      -14-


by agreement to keep-well, to purchase assets, goods, securities or services, or
to take-or-pay or otherwise);  PROVIDED, HOWEVER, that the term "guaranty" shall
not include  endorsements  for  collection or deposit in the ordinary  course of
business.  The terms  "guarantee"  and  "guaranteed"  used as verbs  shall  have
correlative meanings.

     "Guaranty"  shall have the  meaning  ascribed  to such term in SECTION  4.1
hereof.

     "Hazardous  Materials"  shall  mean  all  materials  or  substances  now or
hereafter subject to any Legal Requirements, including, without limitation:

     (i) all substances which are designated pursuant to Section 311(b)(2)(A) of
the Federal Water Pollution Control Act ("FWPCA"), 33 U.S.C. ss. 1251 et seq.,

     (ii) any  element,  compound,  mixture,  solution,  or  substance  which is
designated pursuant to Section 102 of the Comprehensive  Environmental Response,
Compensation and Liability Act ("CERCLA"), 42 U.S.C. ss. 9601 et seq.,

     (iii) any hazardous waste having the  characteristics  which are identified
under or listed  pursuant  to  Section  3001 of the  Resource  Conservation  and
Recovery Act, 42 U.S.C. ss. 6901 et seq.,

     (iv) any toxic pollutant listed under Section 307(a) of FWPCA,

     (v) any hazardous  air  pollutant  which is listed under Section 112 of the
Clean Air Act,42 U.S.C.ss.7401 et seq

     (vi) any imminently hazardous chemical substance or mixture with respect to
which  action  has been  taken  pursuant  to  Section 7 of the Toxic  Substances
Control Act, 15 U.S.C. ss. 2601 et seq.,

     (vii) "hazardous  materials" within the meaning of the Hazardous  Materials
Transportation Act, 49 U.S.C. ss. 1802 et seq.,

     (viii) petroleum or petroleum by-products,

     (ix) asbestos and any materials containing asbestos,

                                      -15-


     (x) any radioactive material or substance,

     (xi) all toxic wastes, hazardous wastes and hazardous substances as defined
by, used in, controlled by, or subject to all implementing  regulations  adopted
and publications promulgated pursuant to, the foregoing statutes, and

     (xii) any other  hazardous or toxic  substance or pollutant  identified  as
such in or regulated under any other  applicable  federal,  state or local Legal
Requirements.

     "Imposition"  shall  have the  meaning  ascribed  to such  term in  SECTION
7.14(B).

     "Improvements"  shall  mean all  buildings,  structures,  fixtures,  tenant
improvements  and  other  improvements  of  every  kind and  description  now or
hereafter  located in or on or  attached  to any Land,  including  all  building
materials, water, sanitary and storm sewers, drainage,  electricity, steam, gas,
telephone and other utility facilities,  parking areas, roads, driveways,  walks
and other site improvements;  and all additions and betterments  thereto and all
renewals, substitutions and replacements thereof.

     "Indebtedness" shall mean, for any Person, without duplication:

     (i)  obligations  created,  issued or incurred by such Person for  borrowed
money (whether by loan, the issuance and sale of debt  securities or the sale of
property to another Person subject to an understanding or agreement,  contingent
or otherwise, to repurchase such property from such Person);

     (ii) obligations of such Person to pay the deferred purchase or acquisition
price of property or  services,  which  purchase  price is (a) due more than six
months  from  the  date of  incurrence  or (b)  evidenced  by a note or  similar
instrument;

     (iii)  indebtedness  of others  secured by a Lien on the  property  of such
Person,  whether or not the respective  Indebtedness so secured has been assumed
by such Person;

     (iv)  obligations  (contingent  or  otherwise) of such Person in respect of
letters of credit or similar  instruments  issued or accepted by banks and other
financial institutions for account of such Person;

                                      -16-


     (v) Capital Lease Obligations of such Person;

     (vi) indebtedness of others guaranteed by such Person  (including,  without
limitation,  indebtedness of a partnership  for which such Person,  if a general
partner, would be liable as a matter of law or contract);

     (vii) any mandatory  payment due with respect to Redeemable  Stock prior to
the Maturity Date, and

     (viii) all  obligations  of such  Person  incurred in  connection  with the
acquisition or carrying of fixed assets by such Person.

     "Initial  Funding  Date"  shall  mean  the  date on  which  the  conditions
precedent  to making of Loans set forth in SECTION  6.1  hereof  shall have been
satisfied,  or waived in writing by the Administrative Agent with the consent of
the Required Lenders.

     "Interest  Expense" shall mean, for the Loan Parties and their Subsidiaries
for any period,  the aggregate  amount  (determined in accordance with GAAP on a
consolidated  basis) of interest (or, in the case of Capital Lease  Obligations,
the interest  component  of such  obligations),  including,  but not limited to,
interest  on the  obligations  under  this  Agreement  and  the  Notes  and  any
Indebtedness the payment of which is secured by Liens on any property,  deducted
in determining Net Income for such period,  including,  without limitation,  all
commissions,  discounts  and other fees and charges owed with respect to letters
of credit and bankers' acceptance  financing,  capitalized  interest and amounts
payable or receivable  under interest rate hedge  agreements,  and including the
applicable   Ratable   Share  of   Interest   Expense  of  each  such   Person's
Unconsolidated Affiliates.

     "Interest  Period"  shall mean,  with respect to a Eurodollar  Rate Loan, a
period  commencing  on and  including  the  date  of  advance,  continuation  or
conversion and ending one month,  two months,  three months,  or, subject to the
consent of all Lenders, six months or twelve months thereafter,  as set forth in
the  applicable  Loan Request or  Continuation  Request,  during which such Loan
bears  interest at a particular  rate based upon the Adjusted  Eurodollar  Rate.
Notwithstanding the foregoing:

     (i) no Interest Period may end on a date subsequent to the Maturity Date;

                                      -17-


     (ii) each Interest  Period that commences on the last  Eurodollar  Business
Day of a  calendar  month  (or on any  day for  which  there  is no  numerically
corresponding day in the appropriate subsequent calendar month) shall end on the
last Eurodollar Business Day of the appropriate subsequent calendar month;

     (iii) each Interest  Period that would otherwise end on a day that is not a
Eurodollar Business Day shall end on the next succeeding Eurodollar Business Day
(or,  if  such  next  succeeding  Eurodollar  Business  Day  falls  in the  next
succeeding calendar month, on the next preceding Eurodollar Business Day);

     (iv)  notwithstanding  clause (i) above,  no Interest  Period  shall have a
duration of less than one month and, if the Interest Period would otherwise be a
shorter period, such Loan shall not be available hereunder for such period; and

     (v) no more than six Interest Periods may be outstanding at any one time.

     "Interest Rate Determination Date" shall mean each date for calculating the
Adjusted  Eurodollar  Rate for  purposes of  determining  the  interest  rate in
respect of an Interest Period. The Interest Rate Determination Date shall be the
second  Eurodollar  Business Day prior to the first day of the related  Interest
Period for any Eurodollar Rate Loan.

     "Investment"  in any Person shall mean any loan,  advance,  or extension of
credit to or for the  account  of, any  guaranty,  endorsement  (other  than for
collection  in the  ordinary  course of  business)  or other  direct or indirect
contingent  liability in connection with the obligations,  Capital  Interests or
dividends or other  distributions of, any ownership,  purchase or acquisition of
any Capital  Interests,  business,  obligations  or securities  of, or any other
interest in or capital contribution to, such Person.

     "Issuing  Bank"  shall have the  meaning  ascribed  to such term in SECTION
2.6(A) hereof.

     "Land" shall mean, in the aggregate,  all unimproved real property owned by
the Loan Parties and their  Subsidiaries,  together  with all of the  tenements,
hereditaments,  easements,  rights-of-way,  rights, privileges and appurtenances
thereunto  belonging  or  in  any  way  pertaining   thereto,   all  reversions,
remainders,  dower and right of dower,  curtesy and right of curtesy, and all of

                                      -18-


the estate,  right,  title,  interest,  claim and demand  whatsoever of the Loan
Parties and their Subsidiaries  therein and in the streets,  alleys,  vaults and
ways adjacent thereto, all rights to the use of common drive entries, all rights
pursuant to any reciprocal easement agreement or trackage agreement,  all strips
and gores within or adjoining such property,  the air space and right to use the
air space above such  property,  all  transferable  development  rights  arising
therefrom or transferred thereto, and the drainage,  mineral, water, oil and gas
rights with respect to such property,  either at law or in equity, in possession
or expectancy, now or hereafter acquired.

     "Leases" shall mean all leases,  tenancies and other agreements for the use
and/or occupancy of a Property or any part thereof.

     "Legal  Requirements"  shall mean all applicable  federal,  state,  county,
municipal and other governmental  statutes,  laws, rules,  orders,  regulations,
ordinances,  judgments,  decrees,  injunctions,  requirements  of common law (as
evidenced by judicial precedent) and binding governmental interpretations of the
foregoing,  whether  now or  hereafter  enacted and in force,  and all  permits,
licenses and  authorizations  relating thereto,  and all covenants,  agreements,
restrictions and encumbrances  contained in any instruments (either of record or
known to a  Borrower),  in force at any  time,  that are  legally  binding  with
respect to any Loan Party or any Subsidiary  thereof or any Property or any part
thereof.

     "Letter of Credit  Obligations"  shall mean, without  duplication,  (i) all
reimbursement  obligations  of the Loan Parties in respect of Letters of Credit,
(ii) all amounts paid by the Administrative Agent to the Issuing Bank in respect
of Letters of Credit and (iii) except to the extent deemed to be Loans  pursuant
to SECTION 2.6(G) hereof,  all amounts paid by the Lenders to the Administrative
Agent and/or the Issuing Bank in respect of Letters of Credit.

     "Letters of Credit"  shall mean the letters of credit issued by the Issuing
Bank for the  account of the Loan  Parties in an  aggregate  face  amount not to
exceed  $10,000,000  outstanding  at any one  time,  as they  may be  drawn  on,
advanced, replaced or modified from time to time.

     "Leverage  Ratio" shall mean,  as of any date of  determination,  the ratio
(expressed as a percentage) of Consolidated  Total Liabilities to Total Property
Asset Value.

                                      -19-


     "Lien" shall mean any interest in property securing an obligation owed to a
Person,  whether such interest is based on the common law,  statute or contract,
and including but not limited to the security  interest arising from a mortgage,
mortgage deed, deed of trust,  encumbrance,  pledge,  conditional  sale or trust
receipt or a lease,  consignment  or bailment  for security  purposes.  The term
"Lien" includes reservations,  exceptions,  encroachments,  easements, rights of
way,  covenants,  conditions,  restrictions,  leases  and  other  similar  title
exceptions   and   encumbrances,   including  but  not  limited  to  mechanics',
materialmen's,   warehousemen's,   carriers'  and  other  similar  encumbrances,
affecting property. For the purposes of this Agreement, a Person shall be deemed
to be the owner of any property  such Person has acquired or holds  subject to a
conditional sale agreement or other arrangement  pursuant to which title to such
property  has been  retained  by or vested in some  other  Person  for  security
purposes.

     "Loan" shall mean a loan made pursuant to SECTION 2.1 hereof.

     "Loan  Party" or "Loan  Parties"  shall  mean and  include  (i) each of the
Borrowers,  (ii)  each of the  Guarantors,  and  (iii)  any  other  Person  that
guarantees,  or  provides  security  for the  repayment  of,  the Loans or other
amounts due under the Facility Documents.

     "Loan  Request"  shall mean a request  for the funding of Loans on or after
the Execution Date, in substantially  the form of EXHIBIT C hereto,  executed by
an Authorized Officer on behalf of a Borrower.

     "Loans" shall mean,  collectively,  the loans from time to time outstanding
and unpaid.

     "London  Interbank  Offered  Rate"  shall  mean,  as of any  Interest  Rate
Determination  Date, the arithmetic  average (rounded upward to the nearest 1/16
of one percent) of the offered  quotations,  if any, to first class banks in the
London  interbank  market  by each of the  Reference  Lenders  for  U.S.  dollar
deposits of amounts in same day funds  comparable to the principal amount of the
Eurodollar Rate Loan of that Reference Lender for which the Adjusted  Eurodollar
Rate is then being determined with maturities  comparable to the Interest Period
for which such Adjusted  Eurodollar  Rate shall apply as of 10:00 A.M. (New York
time) on such Interest Rate Determination Date; PROVIDED,  HOWEVER,  that if any
Reference   Lender   fails  to  provide  the   Administrative   Agent  with  its
afore-mentioned  quotation  then the  London  Interbank  Offered  Rate  shall be
determined based on the quotation(s) provided to the Administrative Agent by the
other Reference Lenders.

                                      -20-


     "Material  Adverse  Effect"  shall mean a material  adverse  effect on, and
"Material Adverse Change" shall mean a material adverse change in:

          (i)  the  financial  condition,  business,   properties,   operations,
     performance  or  current  capital  structure  of the  Borrowers  and  their
     Subsidiaries  taken as a whole,  in each case  after  giving  effect to any
     related transactions,

          (ii)  the  ability  of  any  Loan  Party  to  perform  its  respective
     obligations under any of the Facility Documents to which it is a party, or

          (iii) the  ability  of the  Administrative  Agent and the  Lenders  to
     enforce their rights and remedies under any of the Facility Documents;

     PROVIDED,  HOWEVER,  that  neither  (a) a  default  in  performance  by any
Guarantor of its  obligations  in connection  with the DIHC Purchase Money Notes
nor (b) a default  under any secured  Indebtedness  which is recourse  only to a
particular  asset or assets  (subject to customary  exclusions)  shall in and of
itself  constitute a "Material  Adverse  Change" or a "Material  Adverse Effect"
unless (X) such default  results in the  occurrence of an Event of Default under
SECTION 9.1(B) of this Agreement,  or (Y) such default  otherwise results in the
occurrence of the effect set forth in subclause (i) of this definition.

     "Maturity"  shall mean,  with respect to any Loan and the related Note, (i)
the Maturity Date or (ii) any other date on which such Loan and the related Note
shall be or become due and payable,  in whole or in part, in accordance with the
terms of this Agreement, whether by required prepayment, optional prepayment for
which notice has been given, declaration, acceleration or otherwise.

                  "Maturity Date" shall mean November 3, 2001.

     "Minimum  Long Term Debt Rating"  shall mean a senior  unsecured  long-term
indebtedness  rating of either (i) Baa3 or better as determined  by Moody's,  or
(ii) BBB- or better as determined by S&P; PROVIDED, HOWEVER, that if the ratings
system of Moody's or S&P shall  change,  or if either such rating  agency  shall
cease to be in the business of rating  corporate debt  obligations,  Cornerstone
and the  Lenders  shall  negotiate  in good  faith to amend this  definition  to
reflect such changed  rating system or the  unavailability  of ratings from such
rating agency.

                                      -21-


     "Moody's"  shall mean  Moody's  Investors  Service,  Inc. or any  successor
thereto acceptable to the Administrative Agent.


     "Mortgage"  shall  mean any  mortgage,  deed of  trust,  or other  security
instrument that creates a Lien on real property and/or  improvements  thereon or
assets related thereto to secure Indebtedness;  PROVIDED,  HOWEVER,  that solely
for the purposes of SECTION  8.10(V) of this  Agreement the term Mortgage  shall
not include any mortgage,  deed of trust, or other security  instrument owned by
the  Borrowers  or  their  Subsidiaries  which by its  terms  (i)  provides  the
Borrowers,   directly  or  through  their   Subsidiaries,   with  the  right  to
unilaterally control the management of the property securing such Mortgage,  and
(ii)  causes  the  Borrowers  or  their  Subsidiaries  to own 80% or more of the
economic  interest  in  the  property  securing  such  Mortgage  (including  the
disposition  of  proceeds  of sale and the  distribution  of cash  flow from the
property).

     "Mortgage Loan" shall mean any  Indebtedness  the payment or performance of
which is secured by a Mortgage.

     "Mortgage Note" shall mean any instrument, document or agreement evidencing
a Mortgage Loan.

     "Multiemployer  Plan"  shall  mean a  "multiemployer  plan",  as defined in
Section  3(37) of ERISA,  to which any of the Loan Parties or any of their ERISA
Affiliates is contributing, or ever has contributed, or to which any of the Loan
Parties or any of their ERISA  Affiliates has, or ever has had, an obligation to
contribute.

     "Net Casualty Proceeds" shall mean (i) the amount of any insurance proceeds
or  condemnation  awards  paid to a Loan Party (or,  in the case of a Loan Party
holding an interest in an  Unconsolidated  Affiliate which owns a Property,  the
amount of such awards or proceeds  received by such Loan Party without regard to
the percentage of such Loan Party's beneficial  interest in such  Unconsolidated
Affiliate) as a result of any damage to,  destruction of, taking or condemnation
of, or other casualty to, a Property, minus (ii) in the case of Properties which
are not Unencumbered  Properties,  amounts paid to any Persons holding mortgages
or other Liens on such Property in accordance with the terms and requirements of
such mortgages or other Liens,  minus (iii) in the case of all  Properties,  the
amount incurred by the Loan Parties to repair,  restore or replace such damaged,
destroyed or condemned  Property,  if the Loan Parties are required or otherwise
so choose to repair,  restore  or  replace  such  Property,  minus (iv)  amounts
contractually required to be paid to tenants of such Property as a direct result
of such damage to,  destruction of, taking or condemnation of, or other casualty
to, such Property.

                                      -22-


     "Net  Income"  shall  mean,  with  respect  to the Loan  Parties  and their
Subsidiaries  for any period,  net earnings (or loss) for the period in question
taken as a single  accounting  period,  determined  on a  consolidated  basis in
accordance with GAAP.

     "New Property" shall mean any real property title to which is acquired,  or
which  is  leased  pursuant  to a  Permitted  Ground  Lease,  subsequent  to the
Execution  Date by one or more  Loan  Parties  or other  Subsidiaries  or by any
Unconsolidated Affiliate in which one or more Loan Parties or other Subsidiaries
hold, directly or indirectly, a Capital Interest.

     "NOI"  shall  mean,  with  respect to the  applicable  time  period and any
Property,  an amount equal to (a) the sum of all revenues and income reported by
the Loan  Parties,  and the Loan  Parties'  Ratable  Share of such  revenues and
income  reported by the  Unconsolidated  Affiliates,  from the  operation of the
relevant  Property in accordance  with GAAP minus (b) the sum of all  reasonable
and  customary  expenses  incurred  by the Loan  Parties  and the Loan  Parties'
Ratable Share of such expenses incurred by the Unconsolidated  Affiliates in the
operation of such Property  determined in accordance with GAAP,  including,  but
not limited to,  utility  expenses,  property  taxes,  insurance  premiums,  and
management fees (but excluding interest,  depreciation,  amortization and income
taxes).

     "Note(s)" shall mean the promissory  notes of the Borrowers  referred to in
SECTION 2.2 hereof and shall include any  replacements  therefor issued pursuant
to SECTIONS 10.17 AND 12.1 hereof or otherwise.

     "NYSE" shall mean the New York Stock Exchange, Inc.

     "Officer's   Certificate"  shall  mean  a  certificate   delivered  to  the
Administrative Agent by a Loan Party which is signed by an Authorized Officer on
behalf of such Loan Party.

     "Operating Income  Adjustment" shall mean, as of any date of determination,
the amount  representing  an  adjustment  to NOI or EBITDA,  as the case may be,
determined  by the  Administrative  Agent in  accordance  with the terms of this
Agreement, to account for the Capital Expenditure Deduction, minority interests,
straight-line  rents,  and (solely with respect to the adjustment to NOI and not
to the adjustment to EBITDA) expenses of internal property management.

                                      -23-


     "Pension  Plan"  shall  mean  any  Employee  Benefit  Plan,  other  than  a
Multiemployer  Plan,  which is subject to Section 412 of the Code or Section 302
of ERISA.

     "Permitted Encumbrances" shall mean any of the following:

          (i) Liens for taxes, assessments or other governmental charges not yet
          due or which  are being  contested  in good  faith and by  appropriate
          proceedings by a Loan Party if adequate  reserves with respect thereto
          are  maintained  on the books of the Loan Parties in  accordance  with
          GAAP;

          (ii) Liens of carriers, laborers, warehousemen,  mechanics, landlords,
          materialmen,  repairmen or other like Liens (including maritime liens)
          arising by  operation  of law in the  ordinary  course of business and
          consistent  with  industry  practices  and Liens on  deposits  made to
          obtain the release of such Liens if (a) the underlying obligations are
          not  overdue  for a period  of more than  sixty  (60) days or (b) such
          Liens are being contested in good faith and by appropriate proceedings
          by the Loan Parties or a Subsidiary thereof and adequate reserves with
          respect  thereto are  maintained  on the books of the Loan  Parties or
          such Subsidiary, as the case may be, in accordance with GAAP;

          (iii) easements,  rights-of-way,  zoning and similar  restrictions and
          other similar  encumbrances or title defects  incurred or imposed,  as
          applicable,  in the ordinary  course of business and  consistent  with
          industry  practices  which,  in the aggregate,  are not substantial in
          amount, and which do not in any case materially detract from the value
          of any material  property subject thereto (as such property is used by
          the Loan  Parties)  or  interfere  in any  material  respect  with the
          ordinary  conduct of the  business of the Loan Parties or any of their
          Subsidiaries; PROVIDED, HOWEVER, that any such Liens which arise after
          the Execution  Date are not incurred in connection  with any borrowing
          of money or any commitment to loan any money or to extend any credit;

          (iv)  encumbrances,   easements,  rights-of-way,  zoning  and  similar
          restrictions and other similar encumbrances or title defects listed on
          any title policy for any Existing  Property on the date such  Property
          was acquired by a Loan Party or an  Unconsolidated  Affiliate,  as the
          case may be,  excluding  any  deeds of trust or  mortgage  obligations
          referred to in such title policy; and

                                      -24-


          (v)  pledges  or  deposits  to  secure   obligations   under  workers'
          compensation  laws or  similar  legislation  or to  secure  public  or
          statutory obligations.

     "Permitted  Ground  Lease"  shall mean a  leasehold  estate  under a Ground
Lease, with respect to which

          (i) the  respective  Loan Party or  Subsidiary is the owner of a valid
          and subsisting interest as tenant under such Ground Lease;

          (ii) such Ground Lease is in full force and effect;
                  
          (iii) either (x) the  remaining  term of such Ground Lease is at least
          twenty-five  (25) years after the Execution  Date, or (y) (1) the term
          of such  Ground  Lease  is  renewable  in the sole  discretion  of the
          respective Loan Party or Subsidiary for one or more successive periods
          aggregating,  together with the remaining term of such Ground Lease as
          of the  Execution  Date,  at least  twenty-five  (25) years  after the
          Execution  Date,  and (2) such Ground Lease provides for periodic rent
          increases  which are comparable,  in the reasonable  discretion of the
          Administrative  Agent,  to those  customarily  provided  for in ground
          leases having a term of at least twenty-five (25) years;

          (iv) the  respective  Loan Party or Subsidiary is not in default under
          any of the terms thereof and there are no  circumstances  known to the
          Borrowers or the respective Loan Party or Subsidiary  which,  with the
          passage of time or the giving of notice or both,  would  constitute an
          event of default  thereunder,  the landlord's remedies for which would
          include termination of such Ground Lease;

          (v) such Ground Lease  specifies  that the interest of the  respective
          Loan Party or  Subsidiary  in such  Ground  Lease is  mortgageable  or
          otherwise assignable as security for its monetary obligations;

          (vi) such Ground  Lease  specifies  that upon  foreclosure  or similar
          disposition of the Ground Lease,  the mortgagee or buyer,  as the case
          may be, may assume such Ground Lease, or the lessor shall enter into a
          new ground lease with the  mortgagee or buyer,  as the case may be, on
          substantially the same terms and conditions as such Ground Lease; and

                                      -25-


          (vii) in the judgment of the  Administrative  Agent,  the Borrowers or
          the respective Loan Party or Subsidiary,  their successors and assigns
          and any lender thereto is entitled to reasonable  notice and to rights
          to cure defaults thereunder.

SCHEDULE 1.1(C) hereto sets forth all of the Permitted Ground Leases as to which
the Borrowers or any of their  Subsidiaries and  Unconsolidated  Affiliates is a
party  in  effect  as of  the  Execution  Date,  including  all  amendments  and
modifications thereto.

     "Permitted Investments" shall mean any of the following:

     (a) readily marketable direct or unconditionally  guaranteed obligations of
     the United  States of America that mature within one (1) year from the date
     of purchase by the respective Loan Party or any Subsidiary thereof;

     (b) readily marketable direct obligations of any of the following:  Federal
     Home Loan Mortgage Corporation, Student Loan Marketing Association, Federal
     Home Loan banks, Federal National Mortgage Association, Government National
     Mortgage  Association,  Bank for Cooperatives,  Federal Intermediate Credit
     Banks,  Federal Financing Banks,  Export-Import  Bank of the United States,
     Federal  Land Bank,  or any other agency or  instrumentality  of the United
     States of America;

     (c) insured demand deposits,  certificates of deposit,  bankers acceptances
     and time deposits of United States banks which issue (or the parent company
     of which issues)  commercial  paper rated as described in clause (d) below,
     are organized under the laws of the United States or any state thereof, and
     have combined capital and surplus in excess of  $100,000,000.00;  provided,
     however,  that the aggregate amount at any time so invested with any single
     bank having combined assets of less than  $1,000,000,000.00 will not exceed
     $200,000.00; and

     (d) securities commonly known as "commercial paper" issued by a corporation
     organized  and existing  under the laws of the United  States of America or
     any state  thereof which at the time of purchase are rated by Moody's or by
     S&P at not less than "P 1" if then rated by  Moody's,  and not less than "A
     1", if then rated by S&P.

     "Permitted  Restrictions"  shall mean the  restrictions on sale,  transfer,
assignment  or disposal (but not as to  mortgaging,  encumbering,  securing,  or
financing)  of the  Properties  identified  on  Schedule  7.1 of the WWA  Merger
Agreement,  solely to the  extent  set forth in  Section  7.1 of the WWA  Merger
Agreement.

                                      -26-


     "Person" shall mean any individual, corporation, company, limited liability
company,   voluntary   association,    partnership,    joint   venture,   trust,
unincorporated association or Governmental Authority.

     "Pledge  Agreement" shall mean that certain Pledge  Agreement,  dated as of
the Initial Funding Date, between  Cornerstone LP and the Administrative  Agent,
for the ratable benefit of the Lenders, in the form annexed hereto as EXHIBIT I.

     "Pro Rata Share" shall mean,  for each Lender at any time,  the  percentage
obtained  by  dividing  (i) such  Lender's  Commitment  at such time by (ii) the
Aggregate  Commitment  at such  time,  as such  percentage  may be  adjusted  by
Assignments permitted pursuant to SECTION 12.1 hereof.

     "Properties" shall mean, collectively,  the Existing Properties and the New
Properties,  and "Property" shall mean,  individually,  any Existing Property or
New Property.

     "Property   Obligations"   shall  mean  (i)  all  Indebtedness   (including
Contingent  Obligations)  or other  liabilities  of the Loan Parties  payment of
which is secured by Liens on any of the Properties, (ii) all ground leases as to
which a Loan Party,  or a joint venture in which a Loan Party holds an interest,
is a party thereto,  (iii) all property management agreements as to which a Loan
Party is a party, and (iv) all joint venture or partnership  agreements to which
a Loan Party is a party.

     "Ratable  Share" shall mean, for any Person,  with respect to such Person's
Affiliates or  Unconsolidated  Affiliates,  the  percentage  economic  ownership
interest of such Person in such Affiliate or Unconsolidated Affiliate; PROVIDED,
HOWEVER,  that in the event  that such  Person is the  general  partner  of such
Affiliate or Unconsolidated  Affiliate, such Person's Ratable Share with respect
to such  Affiliate's  or  Unconsolidated  Affiliate's  liabilities  shall be the
percentage  of the  general  partner  interests  owned  by such  Person  in such
Affiliate or Unconsolidated Affiliate with respect to any Indebtedness for which
recourse  may  be  made  against  any  general  partner  of  such  Affiliate  or
Unconsolidated Affiliate.

     "Redeemable  Stock"  shall mean any  Capital  Interest  in a Person that is
subject to redemption otherwise than at the sole option of such Person.

     "Reference  Lenders" shall mean Bankers Trust Company,  The Chase Manhattan
Bank,  NationsBank,  N.A.  and such  other  Lenders  as may from time to time be
designated,  with the consent of such Lenders, by the Administrative  Agent with
the approval of Cornerstone  (which approval shall not be unreasonably  withheld
or delayed).

                                      -27-


     "Regulatory Change" shall mean, with respect to any Lender,

               (i) any  change  after the date of this  Agreement  in, or in the
          applicable   requirements  of,  Federal,  state  or  foreign  laws  or
          regulations (including, without limitation,  Regulation D of the Board
          of Governors of the Federal Reserve System), or

               (ii)  the   adoption   or   making   after   such   date  of  any
          interpretation, directive or request

     (other  than those  applying  solely to banks  formally  determined  by the
     applicable regulator to be in a financially troubled condition),  including
     such Lender,  of or under any Federal,  state or foreign law or regulations
     (whether  or not  having  the force of law and  whether  or not  failure to
     comply  therewith  would  be  unlawful)  by any  court or  governmental  or
     monetary  authority  charged  with  the  interpretation  or  administration
     thereof.

     "REIT" shall mean a "real estate investment trust," as such term is defined
in Section 856 of the Code.

     "Release" shall have the meaning contained in 42 U.S.C. ss. 9601(22).

     "Rent Roll" shall mean,  for any Property,  a rent roll in the form annexed
hereto as EXHIBIT F, with such changes or additions as the Administrative  Agent
may reasonably request or approve.

     "Rents"  shall  mean  all  rents,  issues,  profits,  royalties,  receipts,
revenues, accounts receivable,  security deposits and other deposits (subject to
the prior right of tenants  making such deposits) and income,  including  fixed,
additional  and  percentage   rents,   occupancy   charges,   operating  expense
reimbursements,  reimbursements  for increases in taxes, sums paid by tenants to
the Loan Parties to reimburse the Loan Parties for amounts originally paid or to
be paid by the Loan Parties or the Loan Parties'  agents or affiliates for which
such tenants were liable, as, for example,  tenant  improvements costs in excess
of any work letter,  lease takeover costs, moving expenses and tax and operating
expense  pass-throughs  for  which a tenant is solely  liable,  parking  income,
recoveries for common area  maintenance  expense,  tax,  insurance,  utility and
service  charges  and  contributions,  proceeds  of  sale of  electricity,  gas,
heating, air-conditioning and other utilities and services, deficiency rents and
liquidated damages, and other benefits.

                                      -28-


     "Replacement  Lender"  shall mean a  financial  institution  (other  than a
Lender) selected by the Loan Parties and approved by the Administrative Agent to
become an Assignee (such approval not to be unreasonably withheld).

     "Required Lenders" shall mean, subject to SECTION 10.2(B) hereof, (i) on or
before  the  Initial  Funding  Date,  or at any time no Loans  are  outstanding,
Lenders having no less than 66-2/3% of the aggregate  amount of the  Commitments
and (ii) at all  other  times,  Lenders  holding  no less  than  66-2/3%  of the
aggregate unpaid principal amount of the Loans.

     "Restricted  Investment"  shall  mean any  Investment  by a Person,  to the
extent it does not  constitute  (i) an  Investment  in a Capital  Interest  in a
Subsidiary of such Person, (ii) an Investment in Subsidiary Debt of a Subsidiary
of such Person, or (iii) a Permitted Investment. "Restricted Payment" shall mean
with respect to any Person (the  "Referenced  Person") any of the following when
paid (or when the  proceeds  of which are  paid) to any  Person  other  than the
Referenced  Person by or on behalf of the  Referenced  Person or any  Subsidiary
thereof:

               (i) the payment of any dividend on or any other  distribution  in
               respect of any Capital  Interests in the Referenced Person or any
               Subsidiary     thereof     (other    than    any     Wholly-Owned
               Subsidiary)("Dividends"),

               (ii) any prepayment,  defeasance, redemption, repurchase or other
               acquisition or retirement for value prior to scheduled payment or
               maturity  of any  Indebtedness  of the  Referenced  Person or any
               Subsidiary  thereof  ranked PARI PASSU or subordinate in right of
               payment to the Indebtedness under the Facility Documents,

               (iii) the redemption, repurchase, retirement or other acquisition
               of  any  Capital  Interest  in  the  Referenced   Person  or  any
               Subsidiary  thereof  or of any  warrants,  rights or  options  to
               purchase or acquire any Capital Interest in the Referenced Person
               or any Subsidiary thereof,

                                      -29-


               (iv) any  expenditure  or the incurrence of any liability to make
               any  expenditure  for any  Restricted  Investment,  other than as
               permitted by SECTION 8.2 hereof,

               (v) the payment of any principal of,  interest on, or any amounts
               due in respect of, any Indebtedness of the Referenced  Person and
               its Subsidiaries prohibited by the terms of this Agreement,

               (vi) the payment of any principal  of,  interest on, or any other
               amounts  due  in  respect  of,  any  Subordinated   Debt  of  the
               Referenced Person or any Subsidiary thereof,

               (vii) any payment of a claim, not reduced to final judgment after
               exhaustion of available appellate remedies, for the rescission of
               the purchase or sale of, or for material damages arising from the
               purchase  or  sale  of,  any  Subordinated  Debt  of  or  Capital
               Interests in the Referenced Person, and

               (viii) any payment of or  contribution  to the  consolidated  tax
               liabilities  of the  Person  or  Persons  that  own  the  Capital
               Interests  in the  Referenced  Person  that is in  excess  of the
               amount of the  applicable  taxes  that  would be  payable  by the
               Referenced  Person if it were not taxed as part of a consolidated
               group, as adjusted from time to time for any loss  carry-forwards
               or credits or deductions  available to the ultimate  recipient of
               such payment or contribution.

     "S&P" shall mean Standard & Poor's  Ratings Group or any successor  thereto
reasonably acceptable to the Administrative Agent and the Borrowers.

     "Securities Act" shall mean the Securities Act of 1933, as amended.

     "Solvent"  shall  mean,  as to any  Person  as of the  applicable  date  of
determination,  that such Person has capital sufficient to carry on its business
and  transactions  and all  business  and  transactions  to which it is about to
engage,  is able to pay its debts as they  mature,  and owns  property  having a
value,  both at fair valuation and at the then fair salable value,  greater than
the amount required to pay its then existing debts (including contingencies).

                                      -30-


     "State" shall mean and include,  unless otherwise limited, any State of the
United States, the District of Columbia and the Commonwealth of Puerto Rico.

     "Subordinated  Debt" shall mean all  Indebtedness  of a Person for borrowed
money that, by its terms or other agreement,  is subordinate in right of payment
to any other Indebtedness of such Person;  PROVIDED,  HOWEVER, that Indebtedness
of the Loan Parties shall constitute  Subordinated  Debt only if subordinated to
the  Notes  and  other  Indebtedness  under  the  Facility  Documents  on  terms
reasonably satisfactory to the Required Lenders, in their discretion.

     "Subsidiary"  shall  mean,  with  respect to any Person,  any  corporation,
partnership  or  other  entity  of  which at  least a  majority  of the  Capital
Interests or other  ownership  interests  having by the terms  thereof  ordinary
voting  power to elect a majority  of the board of  directors  or other  persons
performing  similar functions of such  corporation,  partnership or other entity
(irrespective of whether or not at the time Capital Interests or other ownership
interests  of any other  class or classes of such  corporation,  partnership  or
other entity shall have or might have voting power by reason of the happening of
any  contingency)  is at the time directly or indirectly  owned or controlled by
such Person or one or more Subsidiaries of such Person or by such Person and one
or more Subsidiaries of such Person.

     "Subsidiary  Debt" shall mean  Indebtedness  of a Subsidiary  of a Borrower
owed to such Borrower.

     "Taking" shall mean the taking or appropriation  (including by deed in lieu
of condemnation) of any Property,  or any part thereof or interest therein,  for
public or quasi-public  use under the power of eminent domain,  by reason of any
public  improvement or  condemnation  proceeding,  or in any other manner or any
damage  or  injury  or  diminution  in  value  through   condemnation,   inverse
condemnation or other exercise of the power of eminent domain.

     "Total  Property Asset Value" shall mean, as of any date of  determination,
an amount equal to the sum of

         (i)  Combined  Adjusted  NOI for the two  fiscal  quarters  immediately
         preceding such date,  annualized,  for all Properties owned by the Loan
         Parties or their Unconsolidated  Affiliates or Subsidiaries  (including
         Properties  formerly  constituting  Construction  in Process,  from and
         after the date which is six months from the date each such  Property is
         considered  operational  for purposes of GAAP),  other than  Properties
         referred to in clause (ii) of this definition,  divided by nine percent
         (9.0%), plus

                                      -31-


         (ii) the aggregate  Undepreciated Cost Basis of all Properties acquired
         by the Loan Parties or their Unconsolidated  Affiliates or Subsidiaries
         within  the  two  fiscal  quarters  immediately   preceding  such  date
         (including the Loan Parties' and their  Subsidiaries'  Ratable Share of
         such  Undepreciated  Cost  Basis of the  Properties  of  Unconsolidated
         Affiliates), plus

         (iii) the  lesser of (x)  $50,000,000  and (y) the  product of five (5)
         times the aggregate EBITDA of the Designated Pledged Subsidiary for the
         two  fiscal  quarters  immediately  preceding  such  date,  annualized,
         attributable to management,  leasing,  development, and similar service
         contracts  between  itself and the Loan Parties and their  Subsidiaries
         and between  itself and affiliated  and  non-affiliated  third parties,
         plus

         (iv)  the  aggregate  amount  of  costs  incurred  and paid by the Loan
         Parties and their  Subsidiaries  (including the Loan Parties' and their
         Subsidiaries'  Ratable  Share  of  such  costs  incurred  and  paid  by
         Unconsolidated  Affiliates)  from and after the Execution  Date to such
         date for the construction,  renovation, or expansion of Construction in
         Process,  valued at the  Undepreciated  Cost Basis (which  amount shall
         continue  to be  included  in Total  Property  Asset  Value  until such
         Property  satisfies the requirements  for inclusion  pursuant to clause
         (i) above), plus

         (v)  without  duplication,  the  aggregate  amount  of  cash  and  cash
         equivalents of the Loan Parties.

     "UCC" shall mean, with respect to any jurisdiction,  the Uniform Commercial
Code as then in effect in that jurisdiction.  References to terms defined in the
UCC shall mean such terms in the UCC as in effect in such jurisdiction.

     "Unconsolidated  Affiliate" shall mean, in respect of any Person, any other
Person in whom such Person holds an  Investment,  which  Investment is accounted
for  in  the  financial  statements  of  such  Person  on the  equity  basis  of
accounting.

     "Undepreciated  Cost Basis" shall mean,  with respect to any Property,  the
gross  book  value of such  Property  that is  reflected  on the  Borrowers'  or
applicable   Unconsolidated   Affiliate's   consolidated  financial  statements,
excluding  adjustment  or  allowance  for  depreciation  (including  accumulated
depreciation),  calculated and prepared in accordance  with GAAP and the Uniform
System of Accounts.

     "Unencumbered  Properties"  shall mean,  collectively,  (i) all  Properties
wholly  owned,  or leased  pursuant to a  Permitted  Ground  Lease,  by the Loan
Parties  free and clear of any Liens,  other  than  Permitted  Encumbrances  and

                                      -32-


Permitted  Restrictions,  (ii) the Properties  listed on SCHEDULE 1.1(D) hereto,
but only for so long as such  Properties  are  owned,  or leased  pursuant  to a
Permitted  Ground  Lease,  free and clear of any  Liens,  other  than  Permitted
Encumbrances and Permitted Restrictions, by a Person in which one or more of the
Loan Parties owns a Capital Interest,  and (iii) the Property identified as "191
Peachtree  Street" on pages 61 through 63 of the  Cornerstone  Proxy  Statement;
provided,  however,  that no Capital  Interest  held by a Loan Party in the Loan
Party  owning or leasing  such  Property may be subject to any Lien other than a
Lien in favor of the Administrative Agent for the benefit of the Lenders.

     "Unencumbered  Properties  Asset  Value"  shall  mean,  as of any  date  of
determination,  an amount equal to the sum of (i) Combined  Adjusted NOI for the
two  fiscal  quarters  immediately  preceding  such  date,  annualized,  for all
Unencumbered  Properties  owned  or  leased  by  the  Loan  Parties  other  than
Unencumbered  Properties referred to in clause (ii) of this definition,  divided
by nine percent (9.0%), plus (ii) the aggregate  Undepreciated Cost Basis of all
Unencumbered  Properties acquired or initially leased by the Loan Parties within
the two fiscal quarters immediately preceding such date.

     "Unsecured  Interest  Expense"  shall mean,  for the Loan Parties and their
Subsidiaries for any period, the greater of (i) the aggregate amount (determined
in accordance with GAAP on a consolidated basis) of interest on or in respect of
unsecured  Indebtedness of the Loan Parties and their  Subsidiaries  deducted in
determining  Net Income for such  period,  including,  without  limitation,  all
commissions,  discounts  and other fees and charges owed with respect to letters
of credit and bankers' acceptance  financing,  capitalized  interest and amounts
payable or receivable  under interest rate hedge  agreements,  and including the
applicable   Ratable   Share  of   Interest   Expense  of  each  such   Person's
Unconsolidated  Affiliates,  and (ii) an amount equal to the interest that would
have  accrued  during such period,  at a rate of 7.2% per annum,  on the average
daily aggregate  outstanding  principal amount of unsecured  Indebtedness of the
Loan Parties and their Subsidiaries for such period.

     "Voting Interests" shall mean securities, as defined in Section 2(1) of the
Securities Act, of any class or classes, the holders of which are ordinarily, in
the  absence of  contingencies,  entitled  to (i) vote for the  election  of the
corporate  directors (or Persons  performing  similar  functions) or (ii) in the
case of a  partnership,  to manage or direct  the  business  or assets  thereof.
References  in  this  Agreement  to  percentages  of  Voting  Interests,  unless
otherwise  noted,  refer to percentages of votes to which such Voting  Interests
are  entitled in the  election of  corporate  directors  (or Persons  performing
similar functions) rather than to the number of shares.

                                      -33-


     "Wholly-Owned  Property"  shall  mean a  Property  title  to which is owned
solely by one or more Loan Parties.

     "Wholly-Owned  Subsidiary"  shall mean,  with  respect to any  Person,  any
corporation,  partnership or other entity of which all of the Capital  Interests
or  other  ownership  interests  (other  than,  in the  case  of a  corporation,
directors'  qualifying shares) are directly or indirectly owned or controlled by
such Person or one or more  Wholly-Owned  Subsidiaries of such Person or by such
Person and one or more Wholly-Owned Subsidiaries of such Person.

     "Working  Capital" shall mean, as at the date of  determination,  an amount
equal  to (i)  Current  Assets  of the Loan  Parties,  plus  (ii)  the  Facility
Availability,  minus (iii) Current  Liabilities of the Loan Parties,  minus (iv)
cash or cash equivalents of the Loan Parties held in escrow to secure letters of
credit issued or acceptance  facilities  established for the account or upon the
application  of the Loan  Parties  and draws  thereunder,  minus (v)  Contingent
Obligations  of the Loan Parties (A) for which the amount is estimable and as to
which payment is likely to occur,  if at all,  within twelve (12) months of such
date of  determination,  and (B) which do not appear on the audited or unaudited
financial  statements  of  the  Loan  Parties;  in  each  case  determined  on a
consolidated basis according to GAAP.

     "WWA"  shall  mean  William   Wilson  &  Associates,   Inc.,  a  California
corporation.

     "WWA  Acquisition  Debt" shall mean such preexisting  secured  non-recourse
Indebtedness  of WWA and certain of its Affiliates  which is being  assumed,  in
connection with the consummation of the WWA Merger  Agreement,  by the Borrowers
or their  Subsidiaries and which, by its terms,  prohibits the debtor thereunder
from guaranteeing the Guaranteed Obligations.

     "WWA Merger Agreement" shall mean that certain  Contribution  Agreement and
Plan of Merger,  dated as of June 22,  1998,  by and among WWA, the "GP Parties"
(as defined in the WWA Merger  Agreement),  Cornerstone,  and Cornerstone LP, as
amended  as of the date of this  Agreement  or,  from and after the date of this
Agreement, with the consent of the Administrative Agent.

     "Year 2000  Compliant"  shall  have the  meaning  ascribed  to such term in
SECTION 7.20 hereof.

                                      -34-


     SECTION 1.2. Other Definitional  Provisions.  (a) All terms defined in this
Agreement  in the  singular  shall  have  comparable  meanings  when used in the
plural, and VICE VERSA.

     (b) The words "hereof",  "hereby",  "herein",  and "hereunder" and words of
similar  import when used in this  Agreement  shall refer to this Agreement as a
whole  and  not to  any  particular  provisions  of  this  Agreement;  the  term
"hereafter" shall mean after, and the term "heretofore"  shall mean before,  the
date of this Agreement; and Article, Section, schedule,  exhibit, annex and like
references are to this Agreement unless otherwise specified.

     (c) Any defined term that relates to a document  shall  include  within its
definition any amendments,  modifications,  renewals, restatements,  extensions,
supplements,  or substitutions that heretofore may have been or hereafter may be
executed in accordance with the terms thereof and hereof.

     (d) References in this Agreement to particular  sections of the Code or any
other  legislation  shall be  deemed  to refer  also to any  successor  sections
thereto or other redesignations for codification purposes.
                  
     (e) All terms  defined in the UCC and not  otherwise  defined  or  modified
herein shall have the respective meanings ascribed to such terms in the UCC.

     (f) When used with respect to Eurodollar Rate Loans, the words  "continue",
"continued"  and  "continuation"  and words of similar import shall refer to the
continuation, at the end of the applicable Interest Period, of a Eurodollar Rate
Loan for an additional Interest Period.

     SECTION 1.3. Accounting Terms and  Determinations.  (a) Except as otherwise
expressly   provided   herein,   all  accounting  terms  used  herein  shall  be
interpreted,  and all financial  statements and  certificates  and reports as to
financial  matters  required to be delivered to the Lenders  hereunder  shall be
prepared, in accordance with GAAP.

     (b) The Loan Parties  shall  deliver to the Lenders at the same time as the
delivery of any annual  financial  statements  under SECTION 7.1(B) hereof (i) a
description  in  reasonable  detail  of  any  material   variation  between  the
application  of GAAP  employed in the  preparation  of such  statements  and the
application  of accounting  principles  employed in the  preparation of the next
preceding  annual  financial  statements  and (ii)  reasonable  estimates of the
difference between such statements arising as a consequence thereof.


                                      -35-



                                   ARTICLE II
                            AMOUNT AND TERMS OF LOANS

     SECTION 2.1.  Commitments and Loans.  (a) Commitment.  Subject to the terms
and  conditions of this Agreement and in reliance upon the  representations  and
warranties of the Loan Parties  herein set forth,  each Lender hereby  severally
agrees,  subject to the  limitations set forth below with respect to the maximum
amount of Loans  permitted to be  outstanding  from time to time, to lend to the
Borrowers  from time to time during the period from the Initial  Funding Date to
but excluding the Maturity Date an aggregate  amount not exceeding such Lender's
Commitment  minus  such  Lender's  Pro  Rata  Share  of  the  Letter  of  Credit
Obligations.  The  original  amount  of each  Lender's  Commitment  is set forth
opposite its name on EXHIBIT A; PROVIDED,  HOWEVER,  that the Commitments of the
Lenders shall be adjusted to give effect to any  Assignments of the  Commitments
pursuant to SECTION 12.1 hereof.

          (b) Term of Commitment;  Expiration of Obligations. The obligations of
     each  Lender  to  the  Borrowers   under  this  Agreement  shall  terminate
     automatically on the Maturity Date.

          (c)  Survival,  Release  and  Reinstatement  of  Obligations.  (i) The
     occurrence of the Maturity  Date shall not release,  terminate or limit the
     rights or  remedies of the Agents or any Lender or any  obligations  of the
     Loan Parties or any other Person under this Agreement or any other Facility
     Document or arising out of acts, events or circumstances  taken,  occurring
     or  existing  prior  thereto,   and  such  rights  and  remedies  and  such
     obligations  shall  survive  until the Loan  Parties  have  fully  paid and
     performed all their obligations hereunder and thereunder in full.

     (ii) Upon payment of all amounts owed by the Loan Parties to the Agents and
the Lenders under the Facility Documents, the obligations of the Loan Parties to
the Agents and the Lenders,  except as otherwise provided herein or in any other
Facility Document, shall be deemed terminated;  PROVIDED,  HOWEVER, that all the
provisions of this Agreement and the other Facility  Documents shall continue to
be  effective  or  shall be  reinstated,  as the  case  may be,  if any  payment
hereunder or in  connection  with any of the  Facility  Documents at any time is
rescinded  or  otherwise  must be returned to or for the benefit of a Loan Party
(or to the  issuer of any  letter of  credit,  surety  bond or other  instrument
issued to the Administrative  Agent for the account of a Loan Party) as a result
of the  bankruptcy,  insolvency,  reorganization,  imposition of any  creditors'
rights  statute,  or other similar event or proceeding  with respect to any Loan
Party, all as if such payment had not been made.

     SECTION  2.2.  Notes.  (a) The Loans of each Lender shall be evidenced by a
single Note of the  Borrowers,  in  substantially  the form of EXHIBIT B hereto,
payable to the order of such  Lender and  representing  the  obligations  of the
Borrowers to pay an amount equal to the lesser of (A) the Commitment of such

                                      -36-


Lender  and (B) the  aggregate  principal  amount of the Loans from time to time
outstanding  from such Lender,  together with interest  thereon.  Each Lender is
hereby authorized to and shall endorse the date and amount of each of its Loans,
the Interest Periods during which any portion of such Loans is a Eurodollar Rate
Loan and each  payment  or  prepayment  of  principal  thereof  on the  schedule
(including additional pages thereto added by such Lender as required) annexed to
and  constituting a part of its Note, which  endorsement  shall constitute PRIMA
FACIE  evidence  of the  accuracy  of the  information  so  endorsed;  PROVIDED,
HOWEVER,  that the  failure  of any  Lender to insert any such date or amount or
other information on such schedule shall not in any manner affect the obligation
of the  Borrowers  to  repay  any  Loan in  accordance  with  the  terms of this
Agreement.

     (b) Each Note shall (i) except as  otherwise  provided in SECTION  10.17 OR
12.1 hereof,  be dated as of the Initial  Funding  Date,  (ii) be payable at its
Maturity,  and (iii) bear interest in accordance  with the provisions of SECTION
2.3 hereof.

     SECTION 2.3. Interest.  (a) Rate of Interest.  Subject to the provisions of
SECTIONS  2.5 AND 2.9  hereof,  each Loan  shall  bear  interest  on the  unpaid
principal  amount  thereof from the date made through the Maturity Date (whether
by  acceleration or otherwise) at a rate determined by reference to the Adjusted
Eurodollar  Rate;  PROVIDED,  HOWEVER,  that in the event that any Loan is to be
made on a day when there are already six Interest Periods outstanding, such Loan
shall be deemed to be an ABR Loan and shall bear interest at the Alternate  Base
Rate until the  commencement of the next succeeding  Interest  Period,  at which
time such ABR Loan shall be converted  (automatically  and without the necessity
of any action on the part of any Person) to a Eurodollar Rate Loan in accordance
with SECTION 2.4(C)  hereof.  The basis for  determining  the interest rate with
respect  to any Loan  shall be  changed  from  time to time in  accordance  with
SECTION 2.4(C) hereof.

     Subject to the  provisions of SECTIONS 2.8 AND 2.9 hereof,  the Loans shall
bear interest through maturity as follows:

          (i) if an ABR Loan,  then at a rate equal to the Alternate  Base Rate;
     or

          (ii) if a  Eurodollar  Rate  Loan,  then  at the  sum of the  Adjusted
     Eurodollar Rate plus the Applicable Margin.

     (b) Computation of Interest. Interest on the Loans shall be computed (i) in
the case of ABR Loans,  on the basis of a 365-day or 366-day  year,  as the case
may be, and (ii) in the case of Eurodollar Rate Loans, on the basis of a 360-day
year,  in each case for the actual  number of days elapsed in the period  during
which it accrues.  In computing  interest on any Loan,  the day of the making of
such Loan or the first day of an  Interest  Period (if any)  applicable  to such
Loan shall be included,  and the date of payment of such Loan or the  expiration
date of an Interest  Period (if any)  applicable to such Loan shall be excluded;
PROVIDED, HOWEVER, that if a Loan is repaid on the same day on which it is made,
one day's interest shall be paid on that Loan.

                                      -37-


     (c) Interest Payment Dates. Interest accrued on each Loan shall be payable,
without duplication, on:

          (i) the Maturity Date;

          (ii) with respect to any  repayment or  prepayment  of any Loans,  the
     date of such repayment or prepayment, as the case may be; and

          (iii) with  respect to  Eurodollar  Rate  Loans,  the last day of each
     applicable Interest Period and, in connection with any Eurodollar Rate Loan
     having (A) a six-month  Interest Period,  also on the day that would be the
     last day of a  three-month  Interest  Period  commencing on the same day as
     such six-month  Interest Period  commences and (B) a twelve-month  Interest
     Period,  also on the days that would be the last days of a three-, six- and
     nine-month Interest Periods commencing on the same day as such twelve-month
     Interest Period; and

          (iv) with respect to ABR Loans, the date of the conversion of such ABR
     Loans in accordance  with SECTION 2.4(C) hereof or, if the Borrower has not
     elected  to  convert  such  ABR  Loans  or  if  such  ABR  Loans  have  not
     automatically  converted,  monthly in arrears on the last  Business  Day of
     each month.

          SECTION  2.4.  Borrowing  and  Conversion  Procedures.  (a)  Borrowing
     Mechanics.  (i) Loans made on any  Funding  Date  shall be in an  aggregate
     minimum amount of $1,000,000 or an integral  multiple of $500,000 in excess
     thereof.  The Borrowers shall be permitted to make a borrowing  pursuant to
     this SECTION 2.4 only twice  during any 30 day period.  Whenever a Borrower
     desires  that the Lenders  make  Loans,  Cornerstone  shall  deliver to the
     Administrative  Agent a Loan  Request no later  than  10:00 A.M.  (New York
     time) at least three Business Days in advance of the proposed Funding Date.

          (ii)  In  lieu of  delivering  the  above-described  Loan  Request,  a
     Borrower  may  give  the  Administrative  Agent  telephonic  notice  by the
     required  time of any  proposed  Loan under  this  SECTION  2.4;  PROVIDED,
     HOWEVER,  that such  notice  shall be  promptly  confirmed  in  writing  by
     delivery  of a Loan  Request to the  Administrative  Agent on or before the
     applicable Funding Date.  Neither the  Administrative  Agent nor any Lender
     shall incur any liability to the Loan Parties in acting upon any telephonic
     notice  referred to above that the  Administrative  Agent  believes in good
     faith  to  have  been  given  by an  Authorized  Officer  or  other  person
     authorized to borrow on behalf of such Borrower or otherwise acting in good
     faith under this  SECTION  2.4 and upon  funding of Loans by the Lenders in
     accordance with this Agreement  pursuant to any such telephonic notice such
     Borrower shall have effected Loans hereunder.

                                      -38-


          (iii) A Borrower  shall notify the  Administrative  Agent prior to the
     funding  of any Loans in the event  that any of the  matters  to which such
     Borrower is required to certify in the applicable Loan Request is no longer
     true and correct as of the  applicable  Funding Date, and the acceptance by
     such   Borrower  of  the   proceeds  of  any  Loans  shall   constitute   a
     re-certification by such Borrower, as of the applicable Funding Date, as to
     the matters to which such Borrower is required to certify in the applicable
     Loan Request.

          (iv)  Except as  otherwise  provided  in  SECTIONS  2.5(B)  and 2.5(C)
     hereof,  a Loan Request (or  telephonic  notice in lieu  thereof)  shall be
     irrevocable on and after the related Interest Rate Determination  Date, and
     the  applicable  Borrower  shall be bound to make a borrowing in accordance
     therewith.

          (v) Upon  receipt of a notice of  borrowing  pursuant to this  SECTION
     2.4, the  Administrative  Agent shall  promptly (and in no event later than
     3:00 P.M., New York City time, on the date of its receipt of such notice of
     borrowing) inform the Lenders as to the terms thereof.

          (b) Interest Periods.  Subject to SECTION 2.3(A) hereof, in connection
     with each Eurodollar Rate Loan, a Borrower may,  pursuant to the applicable
     Loan Request,  select an Interest Period to be applicable to such Loan, the
     term of which Interest Period shall be at such Borrower's option; PROVIDED,
     HOWEVER,  that the initial  Interest  Period for any Loan shall commence on
     the Funding Date in respect of such Loan.

          (c)  Conversion.  Subject to the  provisions  of SECTIONS  2.3 AND 2.5
     hereof and the requirements of the definition of "Interest Period," so long
     as no Default or Event of Default shall have occurred and be continuing,  a
     Borrower  may  convert  any  ABR  Loan  into  a  Eurodollar  Rate  Loan  by
     irrevocable  written notice delivered to the Administrative  Agent no later
     than 10:00 A.M. (New York time) at least three  Business Days in advance of
     the proposed date of conversion. Such notice shall identify the ABR Loan or
     Loans to be converted  and the  Interest  Period to be  applicable  to such
     Eurodollar Rate Loan or Loans.

          (d) Funding Mechanics. (i) Same Day Funding. Each Lender shall provide
     the  Administrative  Agent with funds, on or before 12:00 noon,  prevailing
     New York time,  on any Funding Date in an amount equal to such Lender's Pro
     Rata  Share of the Loans to be made on such  Funding  Date by  transferring
     same  day  or   immediately   available   funds  to  such  account  as  the
     Administrative  Agent  shall  specify  from  time to time by  notice to the
     Lenders.  Except as otherwise  provided in SECTION 2.7 hereof,  on the date
     requested in such notice, the Administrative  Agent shall make available to
     the applicable  Borrower at such Borrower's account with the Administrative
     Agent or at such  other  account as the  Borrower  shall  designate  in the
     related Loan Request,  in immediately  available funds, the proceeds of the
     Loans being made; PROVIDED, HOWEVER, that the Administrative Agent shall be
     obligated to make the proceeds of such Loans  available  only to the extent
     received by it from the Lenders.

                                      -39-


          (ii) Separate  Obligations.  The amounts  payable by a Borrower at any
     time  hereunder  and under the Notes to each Lender shall be a separate and
     independent debt of such Borrower to that Lender.

          (iii)  Failure  To  Fund.  (A) The  failure  of any  Lender  (each,  a
     "Defaulting  Lender")  to fund  its  Loan  on a  Funding  Date as  required
     hereunder  shall not  relieve  any  other  Lender  of such  other  Lender's
     obligation to fund its Loan on such date,  but (I) neither any other Lender
     nor  the   Administrative   Agent  nor  the   Syndication   Agent  nor  the
     Documentation  Agent shall be responsible for the failure of any Defaulting
     Lender  to fund  such  Defaulting  Lender's  Loan,  (II) no other  Lender's
     Commitment  or Loan shall be  increased  as a result of any such failure of
     any  other   Lender,   (III)  except  as  otherwise   provided  in  SECTION
     2.4(D)(III)(B)   hereof,  no  Lender  shall  have  any  obligation  to  the
     Administrative Agent or any other Lender for the failure by such Defaulting
     Lender to fund its Loan and (IV)  failure  by a  Defaulting  Lender to fund
     shall not relieve any Loan Party of any  obligations to the  Administrative
     Agent and the other Lenders hereunder or under any other Facility Document.

                  (B) Repayment of  Administrative  Agent  Advances.  Unless the
Administrative  Agent shall have received notice from a Lender prior to the date
of any Borrowing that such Lender will not make available to the  Administrative
Agent such Lender's share of such Borrowing, the Administrative Agent may assume
that such Lender has made such share  available to the  Administrative  Agent on
the date of such  Borrowing and the  Administrative  Agent may, in reliance upon
such  assumption,  make  available  to the  applicable  Borrower  on such date a
corresponding  amount.  If and to the extent that such Lender  shall not have so
made such share available to the Administrative Agent,  immediately upon receipt
of notice from the  Administrative  Agent, (I) such Defaulting  Lender shall pay
directly to the Administrative Agent the amount thereof,  together with interest
thereon calculated,  if such payment is received by the Administrative  Agent on
or before the third (3rd)  Business Day following the date on which such funding
was due, at the Federal Funds Rate and in all other cases at the rate  specified
in  SECTION  2.8  hereof  and (II) if not paid by such  Defaulting  Lender,  the
Borrowers shall repay directly to the  Administrative  Agent such amount as will
equal the amount that such Defaulting Lender or Lenders failed to fund, together
with interest  thereon at the  applicable  rate  determined  in accordance  with
SECTION 2.3 hereof.

                                      -40-


                  (C) Replacement  Lenders. At any time within 60 days after the
applicable  Funding Date and repayment by the Borrowers of any amount  described
in SECTION  2.4(D)(III)(B)  above,  the Borrowers,  by writing  addressed to the
Administrative Agent and such Defaulting Lender, may nominate or propose another
bank or other  financial  institution,  including  an existing  Lender,  that is
willing to become a Replacement  Lender or other Assignee of the Commitment of a
Defaulting Lender pursuant to SECTION 12.1 hereof,  and, within 10 Business Days
after receipt of such proposal from the Borrowers,  such Defaulting Lender shall
execute  and deliver to the  Administrative  Agent an  Assignment  of its entire
Commitment  in favor of the  proposed  Replacement  Lender or other  Assignee in
conformity  with SECTION 12.1 hereof  unless,  prior to the  expiration  of such
period,  the  Administrative  Agent shall have  notified the  Borrowers and such
Defaulting Lender that the proposed  Replacement Lender or other Assignee is not
reasonably  acceptable to the Administrative  Agent. In no event will either the
Administrative  Agent or the  Lenders be  obligated  to assist the  Borrower  in
identifying any banks or other financial institutions that are willing to become
a Replacement Lender or other Assignee of any Defaulting Lender.

                  (D) Reservation  of Rights.  Nothing  contained  in this 
SECTION 2.4 shall preclude the  Borrowers  from  pursuing  any other  remedy
against a Defaulting Lender.

                  (e) Remittances by Administrative Agent. In the event that the
Administrative Agent  remits  in  same day or immediately available funds to any
Lender  its share of any  payments  to be made by a  Borrower  pursuant  to this
Agreement or the Notes prior to the time that the Administrative  Agent receives
such payments from such Borrower,  and such Borrower fails to make such payments
when due, immediately upon receipt of notice from the Administrative Agent, such
Lender  shall  repay  directly  to  the  Administrative  Agent  in  same  day or
immediately  available  funds such  amount as will equal such  Lender's  ratable
portion of the amount  that such  Borrower  failed to pay and was so remitted by
the  Administrative  Agent  to  such  Lender,  together  with  interest  thereon
calculated, if such payment is received by the Administrative Agent on or before
the third (3rd) Business Day following the notice to such Lender, at the Federal
Funds Rate and in all other cases at the rate  specified  in SECTION 2.8 hereof.

                  (f)  Continuations.  Subject  to the  limitations  applicable
to  Interest Periods for  Eurodollar  Rate Loans as set forth in the  definition
of Interest Period,  a Borrower  may  continue any  Eurodollar  Rate Loan for an
additional Interest Period; PROVIDED, HOWEVER, that:

                  (i) such  Borrower  shall  give  the   Administrative   Agent
     irrevocable  written  notice in the form of a  Continuation  Request in the
     manner and by the applicable time specified in SECTION 2.4(A)(I) hereof for
     the  borrowing  of  such  Eurodollar  Rate  Loan  and the  Interest  Period
     therefor;

                                      -41-


                  (ii) in the  case of the  continuation  of less  than  all of 
     the outstanding  Eurodollar  Rate Loans  subject to the same Interest
     Period on the same Business Day for the same new Interest Period, the
     aggregate  principal  amount  of each  Eurodollar  Rate Loan having  the 
     same  new  Interest  Period  shall  not be less  than $1,000,000  or  any
     integral  multiple  of  $500,000  in  excess thereof;

                  (iii) no  Eurodollar  Rate Loan may be continued as such for
     less than the minimum applicable Interest Period therefor; and

                  (iv) no  Eurodollar  Rate Loan may be continued as such for an
     additional  Interest  Period if any Default or Event of Default  shall have
     occurred and be continuing  as of any date during the period  commencing on
     the date the  Continuation  Request  is  required  to be  submitted  to the
     Administrative  Agent and ending on the first day of the requested Interest
     Period.

If a Borrower  fails,  in connection  with the expiration of an Interest  Period
applicable to a Eurodollar  Rate Loan, to furnish a Continuation  Request to the
Administrative  Agent for the continuation thereof or fails to elect a permitted
Interest  Period  therefor,  or if the  continuation of Eurodollar Rate Loans is
prohibited  due to the  occurrence  and  continuance  of a  Default  or Event of
Default or otherwise, such Loan (unless the Eurodollar Rate Loans are prepaid in
accordance  with  the  provisions  of  SECTION  2.7  hereof  or  accelerated  in
accordance with SECTION 9.1 hereof) shall be converted  automatically  to an ABR
Loan as of the expiration of then applicable Interest Period.

                  (g)  Notice to  Lenders.  Promptly  upon  receipt  of any Loan
Request,  any notice  pursuant to SECTION  2.4(C)  hereof,  or any  Continuation
Request, the Administrative Agent shall give notice thereof to the Lenders.

                  SECTION 2.5.  Special  Provisions  Governing  Eurodollar  Rate
  Loans.  Notwithstanding any other provision of this Agreement to the contrary,
  the  following  provisions  shall govern with respect to the  Eurodollar  Rate
  Loans as to the matters covered:

                  (a)  Determination  of  Applicable  Interest  Rate. As soon as
  practicable   after  10:00  A.M.   (New  York  time)  on  each  Interest  Rate
  Determination Date, the Reference Lenders shall determine (which determination
  shall,  absent  manifest  error,  be final,  conclusive  and binding  upon all
  parties) the interest rate that shall apply to the  Eurodollar  Rate Loans for
  which an interest rate is then being  determined for the  applicable  Interest
  Period and shall  promptly  give notice  thereof  (in writing or by  telephone
  confirmed in writing) to the Borrowers and each Lender.

                  (b) Inability to Determine  Applicable  Interest  Rate. In the
  event that the Administrative Agent shall have determined (which determination
  shall be final and  conclusive  and binding upon all parties  hereto),  on any
  Interest Rate  Determination  Date with respect to any Eurodollar  Rate Loans,
  
                                      -42-


  that by reason of  circumstances  affecting  the London  interbank  Eurodollar
  market adequate and fair means do not exist for ascertaining the interest rate
  applicable  to such  Loans on the  basis  provided  for in the  definition  of
  Adjusted  Eurodollar  Rate, the  Administrative  Agent shall on such date give
  notice  (by  telefacsimile  or by  telephone  confirmed  in  writing)  to  the
  Borrowers and each Lender of such determination, whereupon (i) no Loans may be
  made or continued as, or converted to,  Eurodollar  Rate Loans until such time
  as the  Administrative  Agent  notifies the Borrowers and the Lenders that the
  circumstances  giving  rise to such  notice no longer  exist and (ii) any Loan
  Request,  any notice pursuant to SECTION 2.4(C) hereof,  and any  Continuation
  Request given by the  Borrowers  with respect to the Loans in respect of which
  such  determination  was made shall be deemed to  contain a request  that such
  Loans be made or continued as, or converted into, ABR Loans.

                  (c) Booking of  Eurodollar  Rate  Loans.  Any Lender may make,
  carry or transfer  Eurodollar  Rate Loans at, to, or for the account of any of
  its branch offices or the office of an Affiliate of that Lender.

                  (d) Assumptions  Concerning  Funding of Eurodollar Rate Loans.
  Calculation  of all  amounts  payable to a Lender  under this  SECTION 2.5 and
  under  SECTION  2.9(A) hereof shall be made as though that Lender had actually
  funded each of its relevant  Eurodollar  Rate Loans  through the purchase of a
  Eurodollar  deposit bearing  interest at the rate obtained  pursuant to CLAUSE
  (I) of the  definition of Adjusted  Eurodollar  Rate in an amount equal to the
  amount of such  Eurodollar  Rate Loan and having a maturity  comparable to the
  relevant  Interest Period and through the transfer of such Eurodollar  deposit
  from an offshore  office of that Lender to a domestic office of that Lender in
  the United  States of America;  PROVIDED,  HOWEVER,  that each Lender may fund
  each of its Eurodollar  Rate Loans in any manner it sees fit and the foregoing
  assumptions  shall be utilized  only for the purposes of  calculating  amounts
  payable under this SECTION 2.5 and under SECTION 2.9(A) hereof.

                  SECTION 2.6 Letters of Credit. (a) Commitment.  Subject to the
terms and conditions set forth in this  Agreement,  at any time and from time to
time  through the day that is thirty (30) days prior to the Maturity  Date,  the
Administrative  Agent shall cause  Bankers  Trust  Company or such other  Lender
designated  by the  Administrative  Agent with the  consent of such  Lender (the
"Issuing Bank") to issue such Letters of Credit for the account of the Borrowers
as the  Borrowers  may  request by a request  for  Letter of  Credit;  PROVIDED,
HOWEVER,  that (i) upon  issuance of any such  Letter of Credit,  the sum of the
aggregate principal amount of all outstanding Loans plus the aggregate Letter of
Credit Obligations shall not exceed the Aggregate Commitment;  (ii) at any time,
the aggregate Letter of Credit  Obligations shall not exceed Ten Million Dollars
($10,000,000);  (iii) the term of any Letter of Credit  shall not extend  beyond
the  Maturity  Date;  and (iv) all Letters of Credit are to be issued on a sight
basis and only in United States dollars.

                                      -43-


     (b)  Letter  of  Credit  Request.   The  Borrowers  shall  deliver  to  the
Administrative  Agent and the Issuing Bank a duly executed request for Letter of
Credit,  in the form of EXHIBIT G hereto,  not later  than 10:00 A.M.  (New York
time),  at least  five (5)  Business  Days  prior to the  date  upon  which  the
requested Letter of Credit is to be issued.  The Borrowers shall further deliver
to the Administrative Agent and the Issuing Bank such additional instruments and
documents as the  Administrative  Agent  and/or the Issuing Bank may  reasonably
require,  in  conformity  with the  standard  practices  of its letter of credit
department, in connection with the issuance of such Letter of Credit.

     (c) Letter of Credit  Fees.  (i) As  consideration  for the issuance of any
Letters of Credit  requested  pursuant to SECTION 2.6(B)  hereof,  the Borrowers
jointly and severally agree to pay to the Administrative Agent, for distribution
to each Lender in proportion  to that Lender's Pro Rata Share,  an annual letter
of credit issuing fee equal to the product of the average daily aggregate amount
available  to be drawn  under  all  Letters  of  Credit  outstanding  times  the
Applicable Margin per annum for Eurodollar Rate Loans of an equivalent aggregate
principal  amount.  The  fees  provided  for in this  SECTION  2.6(C)  shall  be
calculated  on the basis of a 360-day year and the actual number of days elapsed
and shall be  payable  quarterly  in arrears  on the last  Business  Day of each
January, April, July, and October,  commencing with the first such date to occur
after  the  Initial  Funding  Date on  which  any  Letter  of  Credit  shall  be
outstanding, and on the Maturity Date.

          (ii) As  additional  consideration  for the issuance of any Letters of
     Credit  pursuant to this SECTION 2.6, in addition to the fee payable  under
     SECTION 2.6(C)(I) hereof,  the Borrowers jointly and severally agree to pay
     to the  Issuing  Bank,  a  facing  fee,  in  addition  to  the  processing,
     administrative, and similar fees of the Issuing Bank in connection with the
     Letters of Credit,  equal to 0.15% per annum on the average  daily  undrawn
     amount of the Letters of Credit issued by the Issuing Bank and  outstanding
     during such period; PROVIDED, HOWEVER, that the minimum facing fee shall be
     $500.00  per annum per Letter of Credit  issued and  outstanding.  The fees
     provided for in this SECTION 2.6(C)(II) shall be calculated on the basis of
     a 360-day  year and the actual  number of days elapsed and shall be payable
     quarterly in arrears on the last Business Day of each January, April, July,
     and October, commencing with the first such date to occur after the Initial
     Funding Date, and on the Maturity Date.

     (d)  Notice  to  Lenders.   Upon  issuance  of  a  Letter  of  Credit,  the
Administrative  Agent shall promptly  notify the Lenders of the amount and terms
thereof.  The Administrative Agent shall provide copies of each Letter of Credit
to the Lenders promptly  following issuance thereof and shall notify the Lenders
promptly of all payments, reimbursements,  expirations,  negotiations, transfers
and other activity with respect to outstanding Letters of Credit.

     (e)  Participation.  Upon the  issuance of a Letter of Credit,  each Lender
shall be deemed to have  purchased  a pro rata  participation  therein  from the
Issuing  Bank in an amount  equal to such  Lender's  Pro Rata  Share of the face
amount of such Letter of Credit.

                                      -44-


     (f) Draws.  Notwithstanding  any other  provisions of this  Agreement,  the
Borrowers  hereby jointly and severally  agree to reimburse the Issuing Bank, by
making  payment to the  Administrative  Agent at its office,  for any payment or
disbursement  made by the  Issuing  Bank under any Letter of Credit  immediately
after,  and in any event on the date on which the  Borrowers are notified by the
Issuing  Bank of, such  payment or  disbursement.  If and to the extent that any
amounts  are drawn  upon any  Letters of Credit  and are not  reimbursed  by the
Borrowers,  the amount so drawn shall immediately be paid by the  Administrative
Agent to the Issuing Bank,  and, from the date of payment thereof by the Issuing
Bank,  shall be  considered  (i) so long as there  exists no Default or Event of
Default,  a Eurodollar Rate Loan of the  Administrative  Agent having an initial
Interest  Period of one month for all purposes  hereunder and (ii) if there then
exists a Default or Event of Default, a purchase by the Administrative  Agent of
the Issuing Bank's right to reimbursement in respect of such Letter of Credit.

     (g)  Funding.  Promptly  after  payment by the Issuing  Bank of any amounts
drawn upon any Letter of Credit,  and provided that  reimbursement  has not been
promptly  made by the Borrowers by the payment date,  the  Administrative  Agent
shall, without notice to or the consent of the Borrowers,  direct the Lenders to
advance to the  Administrative  Agent, their Pro Rata Share of the amount of the
Loan of the  Administrative  Agent  described  in  SECTION  2.6(F)  hereof.  The
proceeds  of such  advances  shall be  applied  by the  Administrative  Agent to
reimburse  it for the payment made by it to the Issuing Bank under the Letter of
Credit. All amounts paid by the Lenders pursuant to this SECTION 2.6(G) shall be
deemed to be, so long as there exists no Default or Event of Default,  ABR Loans
made pursuant to this Agreement (and, for purposes of this SECTION  2.6(G),  the
failure of the  Borrowers to reimburse  the Issuing Bank in respect of such draw
shall not constitute a Default or Event of Default).

     (h) Maturity  Date. On the occurrence of the Maturity of the Loans prior to
the  expiration  of all Letters of Credit,  the  Borrowers  shall provide to the
Administrative  Agent a standby  letter of  credit  issued by a bank  reasonably
satisfactory to the Administrative Agent, in form and substance  satisfactory to
the Administrative  Agent, in favor of the Administrative Agent in a face amount
equal to outstanding  Letters of Credit on that date plus any outstanding Letter
of Credit fees which would be due through the expiry of each outstanding  Letter
of Credit,  or shall make other  provisions  satisfactory to the  Administrative
Agent  for the  full  collateralization,  by cash or cash  equivalents,  of such
outstanding  Letters of Credit.  In the event of  failure  of the  Borrowers  to
comply with the requirements of this SECTION 2.6(H),  such portion of the amount
remaining  available to be drawn under all  outstanding  Letters of Credit as to
which the Borrowers have failed to comply shall be deemed to be immediately  due
and payable.

                                      -45-


     (i)   Amendments,   Supplements   Etc.  The  issuance  of  any  supplement,
modification,  amendment,  or  extension  to or of any Letter of Credit shall be
treated in all respects the same as issuance of a new Letter of Credit.

     (j)  Assumption  of Risks.  The  Borrowers  assume all risks of the acts or
omissions of any  beneficiary or transferee of any Letter of Credit with respect
to  its  use  of  such  Letter  of  Credit.   Neither  the  Issuing  Bank,   the
Administrative Agent, any Lender nor any of their respective agents, officers or
directors  shall  be  liable  or  responsible  for,  nor  shall  the  Borrowers'
obligations  hereunder  in respect of such  Letters of Credit be  impaired  as a
result of:

                   (A) any lack of validity or  enforceability  of any Letter of
                   Credit or any other agreement or instrument  relating thereto
                   (such Letter of Credit and any other  agreement or instrument
                   relating thereto being,  collectively,  the "Letter of Credit
                   Documents");

                   (B) the use that may be made of any  Letter  of Credit or any
                   acts  or  omissions  of  any  beneficiary  or  transferee  in
                   connection therewith;

                   (C) any  statement or any other  document  presented  under a
                   Letter of Credit proving to be forged, fraudulent, invalid or
                   insufficient  in any respect or any  statement  therein being
                   untrue or inaccurate in any respect;

                   (D) the  existence  of any claim,  set-off,  defense or other
                   right that the  Borrowers  may have at any time  against  any
                   beneficiary  or any  transferee of a Letter of Credit (or any
                   Persons for whom any such  beneficiary or any such transferee
                   may be acting), the Issuing Bank or any other Person, whether
                   in  connection  with  the  transactions  contemplated  by the
                   Letter of Credit Documents or any unrelated transaction;

                   (E)  payment by the  Issuing  Bank  against  presentation  of
                   documents  that do not  comply  with the terms of a Letter of
                   Credit,  including  failure  of any  documents  to  bear  any
                   reference or adequate reference to such Letter of Credit; or

                   (F) any other  circumstances  whatsoever in making or failing
to make payment under any Letter of Credit.

In  furtherance  and not in  limitation of the  foregoing,  the Issuing Bank may
accept   documents   that  appear  on  their  face  to  be  in  order,   without
responsibility   for  further   investigation,   regardless  of  any  notice  or
information to the contrary.

                                      -46-


                  SECTION 2.7.  Prepayments;  Reduction of Aggregate Commitment.
(a) Voluntary Prepayments. The Borrowers from time to time may prepay the Loans,
in whole at any time or in part from time to time,  without  premium  or penalty
(but subject to the  requirements  of SECTION  2.12  hereof),  upon  irrevocable
written notice to the Administrative Agent, given by the Borrowers,  at least as
early before the proposed  date of such  prepayment  as the  corresponding  time
specified  in SECTION  2.4(A)(I)  hereof for notice of the  borrowing  of Loans,
specifying  the date of prepayment and the amount of the  prepayment;  PROVIDED,
HOWEVER,  that each partial  prepayment shall be in an aggregate amount not less
than $1,000,000 or any integral  multiple of $500,000 in excess thereof (or such
lesser  amount of the Loans as may remain  outstanding).  If any such  notice is
given,  the amount  specified  in such  notice  shall be due and  payable in the
manner and by the time provided in SECTION 3.2 hereof,  on the date specified in
such notice,  together with accrued interest thereon to such date as provided in
SECTION  2.3(D) hereof and costs  required to be paid under SECTION 2.12 hereof.
Amounts voluntarily prepaid pursuant to this SECTION 2.7(A) may be reborrowed.

                  (b) Mandatory Prepayments; Casualties. In the event a Borrower
or a Loan  Party  receives  Net  Casualty  Proceeds  as a result of  damage  to,
destruction  of, or  condemnation  or Taking  of,  one or more  Properties,  the
Borrowers  will,  within five (5) Business Days after receipt by such Loan Party
of such Net Casualty  Proceeds,  prepay the principal  amount of the Loans in an
amount equal to the amount of such Net Casualty Proceeds,  together with accrued
interest  thereon to such date and costs  required to be paid under SECTION 2.12
hereof.  Amounts  mandatorily  prepaid  pursuant to this  SECTION  2.7(B) may be
reborrowed.

                  (c) Reduction of Aggregate Commitment. The Borrowers may, upon
thirty  (30)  days'  irrevocable  written  notice to the  Administrative  Agent,
terminate  in whole or  permanently  reduce  in part  the  Aggregate  Commitment
without premium or penalty, PROVIDED, HOWEVER, that, after giving effect to such
reduction,  the Aggregate  Commitment  equals or exceeds the amount of the Loans
plus the  Letter  of  Credit  Obligations  then  outstanding.  Any such  partial
reduction  of  the  Aggregate  Commitment  shall  be  in  a  minimum  amount  of
$5,000,000,  or integral  multiples of $1,000,000 in excess of that amount,  and
shall reduce the Commitment of each Lender  proportionately  in accordance  with
its Pro Rata Share.

                  (d)  Apportionment.  Unless otherwise  requested in writing by
the  Borrowers,  prepayments  shall be  applied  first  against  ABR Loans  then
outstanding  before  being  applied  against  any  Eurodollar  Rate  Loans  then
outstanding.

                  SECTION  2.8.  Interest  on  Delinquent  Payments.  All unpaid
amounts due under the Notes or the terms of this Agreement or any other Facility
Document  that  are not paid  when due and  payable  (including,  to the  extent
permitted  by law,  unpaid  interest on the Notes)  shall bear simple  interest,
subject to the  provisions of SECTION  10.13 hereof,  from and including its due
date until paid in full (whether  before or after the occurrence of any Event of
Default  described in SECTION  9.1(F),  (G) OR (H) hereof) at the Default  Rate.
Unpaid amounts that are not yet due and payable shall bear interest as otherwise
provided herein or in the other Facility Documents.

                                      -47-


                  SECTION 2.9.  Additional  Costs. (a) The Borrowers jointly and
severally  agree to pay to the  Administrative  Agent  from time to time for the
account of any Lender such amounts as such Lender may  determine to be necessary
to compensate such Lender (or its bank holding  company) for any increased costs
that such Lender (or bank holding company) determines are attributable to making
or  maintaining  any  Loan  or its  obligation  to  make or  maintain  any  Loan
hereunder, or any reduction in any amount receivable by such Lender hereunder in
respect of such Loan or such obligation  (such increases in costs and reductions
in amounts  receivable being herein called "Additional  Costs"),  resulting from
any Regulatory Change that:

          (i) shall  subject any Lender (or its  Applicable  Lending  Office for
     such Loan) to any tax,  duty or other charge in respect of such Loan or its
     Note or changes the basis of taxation of any amounts payable to such Lender
     under this Agreement or its Note in respect of such Loan (excluding changes
     in the rate of tax on the  overall  net  income  of such  Lender or of such
     Applicable  Lending Office by the jurisdiction in which such Lender has its
     principal office or such Applicable Lending Office); or

          (ii)  imposes or  modifies  any  reserve,  special  deposit or similar
     requirements  (other than any Eurodollar Reserve Percentage utilized in the
     determination of the interest rate for any Loan) relating to any extensions
     of credit or other assets of, or any deposits with or other liabilities of,
     such  Lender,  or  any  commitment  of  such  Lender  (including,   without
     limitation, the commitment of such Lender hereunder); or

          (iii)  imposes  on such  Lender  any other  condition  affecting  this
     Agreement,  or such Lender's Note or its  commitment or the other  Facility
     Documents or the transactions contemplated hereby or thereby.

If any Lender  requests  compensation  from the  Borrowers  under  this  SECTION
2.9(A),  the  Borrowers  may,  by  notice  to such  Lender  (with  copies to the
Administrative  Agent),  suspend the  obligation  of such Lender  thereafter  to
continue or to convert into Loans affected thereby,  until the Regulatory Change
giving rise to such request ceases to be in effect (in which case the provisions
of SECTION  2.9(G) hereof shall be  applicable);  PROVIDED,  HOWEVER,  that such
suspension shall not affect the right of such Lender to receive the compensation
so requested.

                  (b) Without  limiting the effect of the  provisions of
SECTION  2.9(A) hereof,  in the event that, by reason of any Regulatory  Change,
any Lender either (i) incurs Additional Costs based on or measured by the excess
above a  specified  level of the  amount  of a  category  of  deposits  or other
liabilities  of such Lender that  includes  deposits by  reference  to which the
interest rate on particular Loans is determined as provided in this Agreement or
a category of  extensions of credit or other assets of such Lender that includes
such Lender's  Loans or (ii) becomes  subject to  restrictions  on the amount of
such a category of liabilities or assets that it may hold,  then, if such Lender
so elects by notice to the Borrowers (with a copy to the Administrative  Agent),
the obligation of such Lender to continue or to convert Loans  affected  thereby
shall be suspended until such Regulatory Change ceases to be in effect (in which
case the provisions of SECTION 2.9(G) hereof shall be applicable).

                                      -48-


              (c)  Without  limiting  the  effect  of the  foregoing
provisions of this SECTION 2.9 (but without duplication),  the Borrowers jointly
and severally  agree to pay directly to each Lender from time to time on request
such amounts as such Lender may  determine to be  necessary to  compensate  such
Lender (or, without  duplication,  the bank holding company of which such Lender
is a  Subsidiary)  for any costs  that it  determines  are  attributable  to the
maintenance  by such  Lender  (or any  Applicable  Lending  Office  or such bank
holding  company),  pursuant  to any law or  regulation  or any  interpretation,
directive or request  (whether or not having the force of law and whether or not
failure to comply  therewith  would be unlawful) of any court or governmental or
monetary  authority (i) following any Regulatory  Change or (ii) implementing at
the  national  level  any risk  based  capital  guideline  or other  requirement
(whether or not having the force of law and whether or not the failure to comply
therewith would be unlawful)  hereafter issued by any government or governmental
or  supervisory  authority  implementing  the Basle Accord  (including,  without
limitation, the Final Risk Based Capital Guidelines of the Board of Governors of
the Federal Reserve System (12 C.F.R.  Part 208, Appendix A; 12 C.F.R. Part 225,
Appendix  A) and the Final Risk Based  Capital  Guidelines  of the Office of the
Comptroller  of the  Currency  (12 C.F.R.  Part 3,  Appendix  A)), of capital in
respect of its  obligations  hereunder (such  compensation  to include,  without
limitation,  an amount equal to any reduction of the rate of return on assets or
equity of such Lender (or any  Applicable  Lending  Office or such bank  holding
company)  to a level  below that which such  Lender (or any  Applicable  Lending
Office or such bank  holding  company)  could  have  achieved  but for such law,
regulation, interpretation,  directive or request). For purposes of this SECTION
2.9(C), "Basle Accord" shall mean the proposals for risk based capital framework
described  by  the  Basle  Committee  on  Banking  Regulations  and  Supervisory
Practices  in  its  paper   entitled   "International   Convergence  of  Capital
Measurement  and Capital  Standards"  dated July 1988, as amended,  modified and
supplemented and in effect from time to time or any replacement thereof.

                                      -49-


              (d) Each Lender shall notify the Borrowers of any event
occurring after the date of this Agreement entitling such Lender to compensation
under  SECTION  2.9(A) OR 2.9(C) hereof as promptly as  practicable,  but in any
event  within 45 days  after  such  Lender  obtains  actual  knowledge  thereof;
PROVIDED,  HOWEVER,  that (i) if any Lender fails to give such notice  within 45
days after it obtains actual knowledge of such an event, such Lender shall, with
respect to compensation  payable  pursuant to this SECTION 2.9 in respect of any
costs resulting from such event,  only be entitled to payment under this SECTION
2.9 for costs  incurred  from and after the date 45 days  prior to the date that
such  Lender  does give  such  notice  and (ii) each  Lender  will  designate  a
different  Applicable  Lending  Office for the Loans of such Lender  affected by
such event if such designation will avoid the need for, or reduce the amount of,
such  compensation  and  will  not,  in the  sole  opinion  of such  Lender,  be
disadvantageous to such Lender, except that such Lender shall have no obligation
to  designate  an  Applicable  Lending  Office  located in the United  States of
America.  Each Lender will furnish to the Borrowers a certificate of such Lender
(or its bank holding company) setting forth the basis and amount of each request
by  such  Lender  for  compensation  under  SECTION  2.9(A)  OR  2.9(C)  hereof.
Determinations  and  allocations  by any  Lender  or bank  holding  company  for
purposes of this SECTION 2.9 of the effect of any Regulatory  Change pursuant to
SECTION 2.9(A) OR 2.9(C) hereof, or of the effect of capital maintained pursuant
to SECTION 2.9(C) hereof, on its costs or rate of return of maintaining its Loan
or its obligation to make its Loan, or on amounts receivable by it in respect of
its Loan, and of the amounts  required to compensate such Lender or bank holding
company under this SECTION 2.9, shall be conclusive, absent manifest error.

              (e) The  protection  of this SECTION 2.9 shall be available to
such Lender or any bank holding company regardless of any possible contention of
invalidity or inapplicability of the law,  regulation or condition that has been
imposed. In the event that any such law, regulation or condition is subsequently
held to be invalid or  inapplicable  and the result  thereof is to eradicate any
such  Additional  Cost,  such Lender shall promptly pay to the Borrowers,  (upon
such Lender's  receipt from its bank holding company in the case of compensation
previously  paid to such bank holding  company) an amount equal to the amount of
compensation paid by the Borrowers to such Lender for its account or the account
of a bank  holding  company  as a result of such  invalid or  inapplicable  law,
regulation or condition.

              (f) At any  time  within  60 days  after  any  payment  by the
Borrowers  of any amount  pursuant to SECTION  2.9(A) OR 2.9(C)  hereof that the
Borrowers  deem to be material,  the  Borrowers,  by a writing  addressed to the
Administrative  Agent and each Lender that requested the payment of such amount,
may nominate or propose another bank or financial institution, including another
Lender,  that is willing to become the  Replacement  Lender or other Assignee of
the Commitment of such Lender  pursuant to SECTION 12.1 hereof,  and,  within 10
Business  Days after  receipt of such  proposal  from the  Borrowers,  each such
Lender shall  execute and deliver to the  Administrative  Agent an Assignment of
its  entire  Commitment  in favor of the  proposed  Replacement  Lender or other
Assignee in conformity with SECTION 12.1 hereof unless,  prior to the expiration
of such period, the  Administrative  Agent shall have notified the Borrowers and
such  Lender  that the  proposed  Replacement  Lender or other  Assignee  is not
reasonably  acceptable  to the  Administrative  Agent.  In no event will (i) any
Lender be required to enter into an Assignment of its  Commitment (A) at a price
less than par plus  accrued  interest and prorated  fees to the  effective  date
thereof and costs  required to be paid under  SECTIONS 2.9,  2.12,  2.13 AND 3.3
hereof or (B) unless all such affected  Lenders enter into  Assignments of their
entire  Commitment  or  (ii)  any of the  Administrative  Agent  or  Lenders  be
obligated to assist the Borrowers in  identifying  any banks or other  financial
institutions that are willing to become a Replacement Lender or other Assignee.

                                      -50-


              (g) If  the  obligation  of  any  Lender  to  continue,  or to
convert,  Loans shall be  suspended  pursuant to SECTION  2.9(A) OR 2.13 hereof,
such Lender's  Eurodollar Rate Loans shall be  automatically  converted into ABR
Loans on the last day(s) of the then current  Interest  Period(s) for Eurodollar
Rate Loans (or, in the case of a conversion  required by SECTION  2.9(B) OR 2.13
hereof, on such earlier date as such Lender may specify to the Borrowers, with a
copy to the Administrative Agent) and, unless and until such Lender gives notice
as provided below that the  circumstances  specified in SECTION 2.9(A) OR 2.9(B)
OR 2.13 hereof that gave rise to such conversion no longer exist:

          (i) to the extent that such Lender's  Eurodollar  Rate Loans have been
     so  converted,  all  payments  and  prepayments  of  principal  that  would
     otherwise  be  applied to such  Lender's  Eurodollar  Rate  Loans  shall be
     applied instead to its ABR Loans; and

          (ii) all  Loans  that  otherwise  would be made or  continued  by such
     Lender as Eurodollar  Rate Loans shall be made or continued  instead as ABR
     Loans,  and all ABR Loans of such Lender that otherwise  would be converted
     into Eurodollar Rate Loans shall remain as ABR Loans.

If such Lender gives notice to the Borrowers,  with a copy to the Administrative
Agent,  that the  circumstances  specified  in SECTION  2.9(A) OR 2.9(B) OR 2.13
hereof that gave rise to the conversion of such Lender's  Eurodollar  Rate Loans
pursuant to this SECTION  2.9(G) no longer exist (which such Lender agrees to do
promptly  upon such  circumstances  ceasing to exist) at a time when  Eurodollar
Rate Loans made by other Lenders are  outstanding,  then such Lender's ABR Loans
shall be  automatically  converted,  on the first day(s) of the next  succeeding
Interest  Period(s)  for  such  outstanding  Eurodollar  Rate  Loans of the same
duration,  to the extent  necessary so that,  after giving effect  thereto,  all
Loans are held pro rata (as to  principal  amounts,  interest  rate and Interest
Periods) by the Lenders in accordance with their respective Commitments.

          (h) The  provisions of this Section 2.9 shall survive the  termination
of this Agreement, but such survival shall not extend any time periods set forth
herein.

                  SECTION 2.10. Use of Proceeds.  The proceeds of all Loans made
by the Lenders to the  Borrowers  hereunder  and all Letters of Credit  shall be
used by the  Borrowers  (a) to  refinance  the  indebtedness  under the Existing
Agreement, (b) for acquisitions of real properties, (c) to fund a portion of the
purchase  price  under the WWA Merger  Agreement,  and (d) for  general  working
capital  purposes (but excluding  Interest  Expense and the  amortization of the
principal portion of Indebtedness).

                                      -51-


                   SECTION  2.11.  Payment on  Non-Business  Days. Whenever  any
payment to be made under the Notes or under this Agreement or any other Facility
Document  shall be stated to be due on a day that is not a  Business  Day,  such
payment may be made on the next  succeeding  Business Day, and such extension of
time in such case shall be included in the computation of payment of interest or
fees, as the case may be.

                   SECTION 2.12.  Funding Losses.  (a) The Borrowers jointly and
severally agree to pay within 10 days after demand therefor such amount as will
compensate the Agents and the Lenders for any loss or reasonable expense they 
sustain as a consequence of:

          (i) any default in payment of the principal  amount of any Loan or any
     part thereof or interest accrued thereon, or any other amount due,

          (ii) the occurrence of any Default or Event of Default hereunder,

          (iii) the receipt or recovery or conversion for any reason (including,
     without limitation,  any prepayment or any mandatory conversion pursuant to
     SECTION  2.4(C) OR 2.7 OR 2.13 hereof) of all or any part of any Eurodollar
     Rate Loan prior to the last day of the applicable Interest Period therefor,
     or

          (iv) any  failure to borrow or to  continue  or convert any Loan after
     submitting a Loan Request or a Continuation Request relating thereto to the
     Administrative  Agent  (any  of the  events  referred  to in the  foregoing
     clauses (i) through (iv) being called a "Breakage Event"),

including,  but not limited to, (A) any loss or expense sustained or incurred in
liquidating or employing funds from third parties acquired to effect or maintain
such Loan or any part thereof (such loss to include an amount,  if any, equal to
the excess,  as reasonably  determined by a Lender, of (x) its cost of obtaining
funds for the  Eurodollar  Rate Loan that is the subject of such Breakage  Event
for the  period  from  the  date of such  Breakage  Event to the last day of the
Interest  Period in effect (or that  would  have been in  effect)  for such Loan
minus  (y) the  amount  of  interest  likely to be  realized  by such  Lender in
redeploying  the funds released or not utilized by reason of such Breakage Event
for such  period),  and (B) any loss of margin on  reemployment  of the funds so
received or recovered.

                  (b) Each  Lender  shall be  entitled to fund its Loans
hereunder in such manner as it may determine in its sole  discretion;  PROVIDED,
HOWEVER,  that, for the purposes of  calculations  under this SECTION 2.12, each
Eurodollar  Rate Loan shall be deemed to have been funded by the purchase in the
Eurodollar  interbank market of a Dollar deposit in an amount  comparable to the
principal amount of such Loan and having a maturity comparable to the applicable
Interest Period therefor.

                                      -52-


                  (c) A certificate  of the  Administrative  Agent or any
Lender as to any  additional  amounts  payable  pursuant  to this  SECTION  2.12
setting  forth  the  basis  and  method of  determining  such  amounts  shall be
conclusive, absent manifest error, as to the determination by the Administrative
Agent or Lender set forth therein.

                  (d) The  provisions  of this  SECTION  2.12 shall  survive the
termination of this Agreement.

                  SECTION  2.13.  Change in  Legality.  (a) If,  anything to the
contrary herein  contained  notwithstanding,  any applicable  existing or future
law, regulation,  guideline,  treaty or directive or condition or interpretation
thereof  (including,  without  limitation,  any  request,  guideline  or policy,
whether or not having the force of law), by any Governmental  Authority  charged
with the administration or interpretation  thereof,  or any change in any of the
foregoing,  shall make it unlawful or improper for any Lender or its  Applicable
Lending  Office to make or maintain any portion of its Loans as Eurodollar  Rate
Loans,  then, by oral notice to the  Borrowers,  and the  Administrative  Agent,
promptly confirmed in writing (which may be by teletransmission  and which shall
state the basis for such notice),  the  Administrative  Agent shall declare that
such Lender's  obligation to make or maintain Loans as Eurodollar  Rate Loans is
suspended  until such time as such Lender may again make and  maintain  Loans as
Eurodollar Rate Loans and all such Lender's  Eurodollar Rate Loans shall convert
automatically into ABR Loans at the end of their then current Interest Period or
at such earlier time as such Lender may specify (in which case the provisions of
SECTION 2.9(G) hereof shall be applicable).

                  (b)  At  any  time  within  60  days  after  notice  from  the
Administrative  Agent pursuant to this SECTION 2.13 and thereafter until 60 days
after the date on which such  notice is  withdrawn,  the  Borrowers,  by writing
addressed  to the  Administrative  Agent and each Lender for which it has become
unlawful or improper to make or maintain any Loans as Eurodollar Rate Loans, may
nominate or propose  other banks or financial  institutions  that are willing to
become Replacement Lenders or other Assignees of the Commitments of such Lenders
pursuant to SECTION 12.1 hereof,  and,  within 10 Business Days after receipt of
such proposal from the Borrowers,  each such Lender shall execute and deliver to
the Administrative  Agent an Assignment of its entire Commitment in favor of the
proposed  Replacement  Lender  or other  Assignee  indicated  in the  Borrower's
proposal in conformity with SECTION 12.1 hereof unless,  prior to the expiration
of such period, the Administrative Agent shall have notified the Borrowers,  and
such  Lender  that  one or more of the  proposed  Replacement  Lenders  or other
Assignees is not reasonably  acceptable to the Administrative Agent. In no event
will (i) any Lender be required to enter into an  Assignment  of its  Commitment
(A) at a price less than par plus  accrued  interest  and  prorated  fees to the
effective  date thereof and costs  required to be paid under SECTIONS 2.9, 2.12,
2.13  AND 3.3  hereof  or (B)  unless  all  such  affected  Lenders  enter  into
Assignments of their entire Commitment or (ii) either the  Administrative  Agent
or the Lenders be obligated to assist the Borrowers in identifying  any banks or
financial  institutions that are willing to become Replacement  Lenders or other
Assignees.

                                      -53-


     SECTION  2.14.  Increase in Aggregate  Commitment.  (a)  Subsequent  to the
Execution Date, but on or before the Initial Funding Date, the Borrowers may, on
one or more occasions, upon at least 10 days' notice to the Administrative Agent
(which shall promptly provide a copy of such notice to the Lenders),  propose to
increase the Aggregate  Commitment by an amount not to exceed $70,000,000 in the
aggregate  of all such  increases  pursuant to this  SECTION  2.14 (that is, the
Aggregate  Commitment  shall not exceed  $600,000,000)  (the  amount of any such
increase,  the "Increased  Commitments").  In such notice,  the Borrowers  shall
designate one or more banks or other financial  institutions  (which may be, but
need not be, one or more of the existing Lenders) which at the time agree to (i)
in the case of any such bank or other financial  institution that is an existing
Lender,  increase its  Commitment and (ii) in the case of any other such bank or
other financial  institution (an  "Additional  Lender"),  become a party to this
Agreement.  No bank or other  financial  institution  may  become an  Additional
Lender  unless it would  qualify as an  Eligible  Assignee  for the  purposes of
ARTICLE XII hereof.  The sum of the increases in the Commitments of the existing
Lenders  pursuant to this  subsection (a) plus the Commitments of the Additional
Lenders  shall  not in the  aggregate  exceed  the  unsubscribed  amount  of the
Increased  Commitments.  No existing  Lender  shall be required to increase  its
Commitment  in  connection  with an  increase  in the  amount  of the  Aggregate
Commitment pursuant to this SECTION 2.14.

                   (b) An  increase  in the amount of the  Aggregate  Commitment
pursuant to this  SECTION 2.14 shall  become  effective  upon the receipt by the
Administrative  Agent of an agreement in form and substance  satisfactory to the
Administrative  Agent  signed  by the  Borrowers,  by the  Guarantors,  by  each
Additional  Lender and by each other Lender whose Commitment is to be increased,
setting  forth  the new  Commitments  of such  Lenders  and  setting  forth  the
agreement of each  Additional  Lender to become a party to this Agreement and to
be bound by all the terms and provisions hereof,  together with such evidence of
appropriate corporate authorization on the part of the Borrowers with respect to
the Increased Commitments (including  authorization of payment to the Lenders of
any costs which may be incurred  under  SECTION 2.12 hereof in  connection  with
reallocation of outstanding  Loans) as the  Administrative  Agent may reasonably
request.


                                      -54-



                                   ARTICLE III
                                FEES AND PAYMENTS
 
                  SECTION 3.1. Fees. (a) Unused Line Fee. The Borrowers  jointly
and severally agree to pay to the Administrative Agent, for distribution to each
Lender  in  proportion  to that  Lender's  Pro Rata  Share,  a fee  equal to the
Applicable  Unused Line Fee Margin (as such term is defined in the definition of
"Applicable  Margin")  per  annum on the  daily  average  amount  by  which  the
Aggregate Commitment exceeds the outstanding principal balance of the Loans plus
the Letter of Credit  Obligations.  The fees provided for in this SECTION 3.1(A)
shall be calculated on the basis of a 360-day year and the actual number of days
elapsed and shall be payable monthly in arrears on the last day of each calendar
month,  commencing  with the first such date to occur after the Initial  Funding
Date, and on the Maturity Date.

                  (b)  Administration  Fee. The Borrowers  jointly and severally
agree to pay to the Administrative  Agent an administration fee equal to $75,000
per  annum.  The fee  provided  for in this  SECTION  3.1(B)  shall  be  payable
quarterly in arrears on the last day of each calendar  quarter,  commencing with
the first such date to occur after the Initial Funding Date, and on the Maturity
Date.  The  administration  fee shall be payable as provided in this  subsection
notwithstanding  that the amount  borrowed  shall be less than the amount of the
Aggregate Commitment.

                  SECTION   3.2.   Payments.   Each  payment   (including   each
prepayment) whether in respect of principal,  interest,  fees,  increased costs,
break funding  costs,  or other amounts  pursuant to this Agreement or the other
Facility Documents,  shall be made to the Administrative  Agent for the accounts
of the Persons entitled  thereto.  All such payments  required to be made to the
Administrative Agent shall be made, without set-off, withholding,  deduction, or
counterclaim, not later than 10:00 a.m., New York City time, on the date due, in
same day or immediately  available funds, to such account as the  Administrative
Agent shall specify from time to time by notice.  Funds received after that time
shall  be  deemed  to have  been  received  by the  Administrative  Agent on the
following  Business  Day.  The  Administrative  Agent shall remit in same day or
immediately  available  funds  promptly  (and in the case of fees payable to the
Lenders in connection with the execution and delivery of this Agreement,  on the
Execution  Date) to each  Lender  (or  other  holder of a Note  notified  to the
Administrative  Agent) its  share,  if any,  of such  payments  received  by the
Administrative  Agent for the account of such  Lender or holder,  which shall be
based upon (i) in the case of payments  in respect of  principal  and fees,  the
Lenders'  respective  Loans  and  (ii) in the  case of  interest,  the  Lenders'
respective amounts of the ABR Loans and the Eurodollar Rate Loans.

                                      -55-


              SECTION 3.3. Taxes.  (a) Any and all payments by the Borrowers
pursuant to the Facility  Documents  shall be made, in accordance with the terms
hereof and  thereof,  free and clear of and  without  deduction  for any and all
present or future  taxes  (other  than any tax on the  overall net income of any
Lender),  levies,  imposts,  deductions,   charges  or  withholdings,   and  all
liabilities with respect thereto, no matter in what jurisdiction  (collectively,
"Indemnified  Taxes"),  except  as  required  by law.  If the  Borrowers  or the
Administrative  Agent  shall  be  required  by law to  deduct  or  withhold  any
Indemnified  Taxes from or in respect of any sum payable  hereunder or under the
other Facility Documents to the Administrative  Agent or any Lender, (i) the sum
payable shall be increased as may be necessary so that after making all required
deductions  (including  deductions  applicable to additional  sums payable under
this  SECTION  3.3) the  Administrative  Agent or such Lender  shall  receive an
amount equal to the sum it would have received had no such deductions been made,
(ii) the Borrowers shall make such deductions, (iii) the Borrowers shall pay the
full amount  deducted to the relevant  taxation  authority or other authority in
accordance  with  applicable  law, and (iv) the  Borrowers  shall deliver to the
Administrative  Agent  evidence  of such  payment to the  relevant  Governmental
Authority within 30 days after making such payment.

                  (b) In addition,  the  Borrowers  jointly and severally
agree  to pay any  present  or  future  stamp  or  documentary  taxes,  taxes on
indebtedness  or any other  excise,  property  or ad valorem  taxes,  charges or
similar  levies  of the  United  States or any  State or  political  subdivision
thereof or any applicable foreign  jurisdiction that arise from any payment made
by them  hereunder  or from the  execution,  delivery  or  registration  of,  or
otherwise  with  respect  to,  this  Agreement  or any other  Facility  Document
(collectively,  but excluding any income or franchise taxes,  "Other Taxes") and
to deliver to the Administrative  Agent evidence of such payment to the relevant
Governmental Authority.

                  (c) The  Borrowers  jointly  and  severally  agree to
indemnify  the  Administrative  Agent  and the  Lenders  for the full  amount of
Indemnified Taxes and Other Taxes (including,  without  limitation,  Indemnified
Taxes and Other Taxes imposed by any  jurisdiction on amounts payable under this
SECTION 3.3) paid by the Administrative Agent or any Lender (as the case may be)
and any liability (including penalties, interest and expenses) arising therefrom
or with respect thereto,  whether or not such  Indemnified  Taxes or Other Taxes
were correctly or legally asserted. This indemnification shall be made within 10
days after written demand therefor by the Administrative Agent or any Lender.

                  (d) In the event  that any such  Indemnified  Taxes or
Other Taxes are  subsequently  held to be invalid or inapplicable and the result
thereof is to eradicate the payment of any amounts paid pursuant to this SECTION
3.3, the applicable  Lender shall promptly notify the  Administrative  Agent and
the  Borrowers of such fact and shall remit to the  Borrowers  (upon  receipt by
such Lender from the relevant Governmental  Authority of such amount, whether as
a refund or as a  credit),  an amount  equal to the  portion  of such  refund or
credit applicable to any payment by the Borrowers  pursuant to this SECTION 3.3.
In the event that a Lender otherwise  receives a refund or credit for taxes paid
or indemnified by the Borrowers under this SECTION 3.3, such Lender shall notify
the Administrative Agent and the Borrowers promptly of such fact and shall remit
to the Borrowers the amount of such refund or credit  applicable to the payments
made by the Borrowers in respect of such Lender under this SECTION 3.3.

                                      -56-


                  (e)  Without prejudice to the survival of any other  agreement
of the Borrowers hereunder, the agreements and obligations of the Borrowers 
contained in this SECTION 3.3 shall survive the payment in full of  principal,
interest, fees and other amounts hereunder and under the other Facility 
Documents.  For each of the Indemnified Taxes or Other Taxes that is subject to 
a statute of limitations by law, the indemnification by the Borrowers shall be 
limited in duration to the actual expiration of the applicable statute of 
limitations.

                  (f) (i) Each Lender,  if any, that is not organized  under the
laws of the United  States of America or any State agrees (A) prior to the first
payment to such  Lender of any amounts  due to such  Lender  under the  Facility
Documents,  upon  request  by the  Borrowers,  to  execute  and  deliver  to the
Borrowers, and the Administrative Agent completed counterparts of IRS Forms 1001
or 4224 or W-8 (or any successor thereto or substitute therefor), as applicable,
which initially  justify the complete  elimination of United States  withholding
obligations and (B) thereafter, upon written request by the Borrowers, from time
to time in order to maintain  the  effectiveness  and accuracy of such tax forms
and  otherwise to comply with United  States tax laws, to execute and deliver to
the  Administrative  Agent and the Borrowers such additional or supplemental tax
forms with respect to amounts due to such Lender under the Facility Documents as
such Lender  properly can execute in conformity with applicable law as in effect
at the time.

                  (ii) Notwithstanding the other provisions of this SECTION 3.3,
the  Borrowers  shall not be obligated to  indemnify  either the  Administrative
Agent or any Lender that is not organized under the laws of the United States of
America or any State for or against  (A) any  Indemnified  Taxes if such  Lender
fails to comply  with the  provisions  of  SECTION  3.3(F)(I)  hereof or (B) any
increase  in the amount of  Indemnified  Taxes  otherwise  reimbursable  to such
Lender that  results  directly  from any  voluntary  action taken by such Lender
(whether by changing its Applicable  Lending Office or otherwise) that increases
the amount of such Indemnified Taxes.

                                      -57-


                  (g) At any time within 60 days after any payment by the
Borrowers of any amount  pursuant to SECTION  3.3(C)  hereof that the  Borrowers
deem to be material,  the Borrowers,  by writing addressed to the Administrative
Agent and the Lender that requested the payment of such amount,  may nominate or
propose  another bank or financial  institution,  including an existing  Lender,
that is  willing  to become  the  Replacement  Lender or other  Assignee  of the
Commitment  of such  Lender  pursuant to SECTION  12.1  hereof,  and,  within 10
Business Days after receipt of such  proposal  from the  Borrowers,  such Lender
shall  execute  and deliver to the  Administrative  Agent an  Assignment  of its
entire Commitment in favor of the proposed  Replacement Lender or other Assignee
in conformity  with SECTION 12.1 hereof unless,  prior to the expiration of such
period,  the  Administrative  Agent shall have notified the Borrowers,  and such
Lender that the proposed  Replacement Lender or other Assignee is not reasonably
acceptable  to the  Administrative  Agent.  In no event  will (i) any  Lender be
required to enter into an Assignment of its  Commitment (A) at a price less than
par plus accrued  interest and prorated fees to the  effective  date thereof and
costs required to be paid under  SECTIONS 2.9, 2.12,  2.13 AND 3.3 hereof or (B)
unless  all such  affected  Lenders  enter  into  Assignments  of  their  entire
Commitment or (ii) either the  Administrative  Agent or the Lenders be obligated
to assist the Borrower in identifying any banks or financial  institutions  that
are willing to become an Assignee.

                  (h) Any Lender  claiming  additional  amounts  payable
pursuant to this SECTION 3.3 agrees to use its reasonable  efforts to change the
jurisdiction  of its lending office if the making of such change would avoid the
need for,  or  reduce  the  amount  of,  any such  additional  amounts  that may
thereafter accrue and would not be otherwise disadvantageous to such Lender. The
parties  agree  that  New  York,  New  York  is  an  acceptable  lending  office
jurisdiction for purposes of this SECTION 3.3.


                                      -58-


                                   ARTICLE IV
                                    GUARANTY

                  SECTION  4.1.  Guaranty  of  Payment.  Subject to SECTION  4.7
below,  each of the Guarantors  hereby,  jointly and severally,  unconditionally
guarantees  to each Lender and the Agents the prompt  payment of the  Guaranteed
Obligations  in full  when due  (whether  at  stated  maturity,  as a  mandatory
prepayment,  by  acceleration  or otherwise)  (the  "Guaranty").  The Guarantors
additionally,  jointly and severally,  unconditionally  guarantee to each Lender
and the  Agents  the  timely  performance  of all  other  obligations  under the
Facility Documents. This Guaranty is a guaranty of payment and not of collection
and is a continuing guaranty and shall apply to Guaranteed  Obligations whenever
arising.

                  SECTION 4.2. Obligations Unconditional. The obligations of the
Guarantors hereunder are absolute and unconditional,  irrespective of the value,
genuineness,  validity,  regularity or  enforceability  of any of the Guaranteed
Obligations  or  any of the  Facility  Documents,  or  any  other  agreement  or
instrument  referred to therein,  to the fullest extent  permitted by applicable
law,  irrespective of any other  circumstance  whatsoever  which might otherwise
constitute a legal or equitable  discharge or defense of a surety or  guarantor.
Each Guarantor  agrees that this Guaranty may be enforced by the Lenders without
necessity  at any time of  resorting  to or  exhausting  any other  security  or
collateral  and  without  the  necessity  at any time of having  recourse to the
Notes, any other of the Facility Documents or any collateral,  if any, hereafter
securing the  Guaranteed  Obligations or otherwise,  and each  Guarantor  hereby
waives the right to require the Lenders to proceed  against the Borrowers or any
other Person  (including a co-guarantor) or to require the Lenders to pursue any
other remedy or enforce any other right.  Each Guarantor  further agrees that it
shall have no right of  subrogation,  indemnity,  reimbursement  or contribution
against the Borrowers or any other  Guarantor of the Guaranteed  Obligations for
amounts paid under this  Guaranty  until such time as the Lenders have been paid
in full,  all  Commitments  under this Agreement  have been  terminated,  and no
Person or  Governmental  Authority shall have any right to request any return or
reimbursement of funds from the Lenders in connection with monies received under
the Facility  Documents.  Each Guarantor  further agrees that nothing  contained
herein  shall  prevent the  Lenders  from suing on the Notes or any of the other
Facility  Documents or  foreclosing  their  security  interest in or Lien on any
collateral, if any, securing Guaranteed Obligations or from exercising any other
rights  available  to them under  this  Agreement,  the Notes,  any other of the
Facility  Documents,  or any  other  instrument  of  security,  if any,  and the
exercise of any of the aforesaid  rights and the  completion of any  foreclosure
proceedings  shall  not  constitute  a  discharge  of  any  of  any  Guarantor's
obligations  hereunder;  it being the purpose and intent of each  Guarantor that
its obligations hereunder shall be absolute, independent and unconditional under
any and all  circumstances.  Neither  any  Guarantor's  obligations  under  this
Guaranty nor any remedy for the enforcement thereof shall be impaired, modified,
changed or released in any manner  whatsoever  by an  impairment,  modification,
change,  release or limitation of the liability of the Borrowers or by reason of
the bankruptcy or insolvency of any Borrowers. Each Guarantor waives any and all
notice of the creation,  renewal,  extension or accrual of any of the Guaranteed
Obligations  and  notice of or proof of  reliance  of by any Agent or any Lender
upon this Guaranty or acceptance of this Guaranty.  The Guaranteed  Obligations,
and any of them, shall  conclusively be deemed to have been created,  contracted
or incurred,  or renewed,  extended,  amended or waived,  in reliance  upon this
Guaranty.  All dealings between the Borrowers and any of the Guarantors,  on the
one hand, and the Agents and the Lenders,  on the other hand,  likewise shall be
conclusively  presumed to have been had or  consummated  in  reliance  upon this
Guaranty.

                                      -59-


                  SECTION 4.3. Modifications. Each Guarantor agrees that (a) all
or  any  part  of  the  security  now  or  hereafter  held  for  the  Guaranteed
Obligations,  if any, may be exchanged,  compromised or surrendered from time to
time; (b) the Lenders shall not have any obligation to protect,  perfect, secure
or insure any such security  interests,  Liens or encumbrances  now or hereafter
held, if any, for the Guaranteed  Obligations or the properties subject thereto;
(c) the time or place of payment of the Guaranteed Obligations may be changed or
extended,  in whole or in  part,  to a time  certain  or  otherwise,  and may be
renewed or  accelerated,  in whole or in part;  (d) the  Borrowers and any other
party liable for payment under the Facility Documents may be granted indulgences
generally;  (e) any of the  provisions of the Notes or any of the other Facility
Documents  may be  modified,  amended or waived;  (f) any party  (including  any
co-guarantor)  liable for the payment  thereof may be granted  indulgences or be
released;  and (g) any deposit  balance for the credit of the  Borrowers  or any
other party liable for the payment of the Guaranteed  Obligations or liable upon
any security therefor may be released,  in whole or in part, at, before or after
the stated, extended or accelerated maturity of the Guaranteed Obligations,  all
without notice to or further assent by such Guarantor,  which shall remain bound
thereon,  notwithstanding any such exchange, compromise,  surrender,  extension,
renewal,  acceleration,  modification,  indulgence  or release.  Each  Guarantor
hereby  appoints  Cornerstone as its agent to execute and deliver any amendments
to or modifications or waivers of the Facility Documents, and the Agents and the
Lenders may rely on such appointment  until such time as a Guarantor advises the
Agents and the Lenders in writing that Cornerstone is no longer authorized to so
act as its agent.

                  SECTION 4.4. Waiver of Rights. Each Guarantor expressly waives
to the fullest extent  permitted by applicable  law: (a) notice of acceptance of
this Guaranty by the Lenders and of all extensions of credit to the Borrowers by
the Lenders; (b) presentment and demand for payment or performance of any of the
Guaranteed Obligations; (c) protest and notice of dishonor or of default (except
as  specifically  required in this  Agreement)  with  respect to the  Guaranteed
Obligations or with respect to any security therefor;  (d) notice of the Lenders
obtaining,  amending,  substituting  for,  releasing,  waiving or modifying  any
security  interest,  Lien  or  encumbrance,   if  any,  hereafter  securing  the
Guaranteed Obligations, or the Lenders' subordinating, compromising, discharging
or releasing such security  interests,  Liens or  encumbrances,  if any; (e) all
other  notices to which such  Guarantor  might  otherwise be  entitled;  and (f)
demand for payment under this Guaranty.


                                      -60-


                  SECTION 4.5. Reinstatement.  The obligations of the Guarantors
under this  ARTICLE IV shall be  automatically  reinstated  if and to the extent
that for any reason any  payment by or on behalf of any Person in respect of the
Guaranteed  Obligations is rescinded or must be otherwise restored by any holder
of any of the Guaranteed Obligations,  whether as a result of any proceedings in
bankruptcy or  reorganization  or otherwise,  and each Guarantor  agrees that it
will indemnify the Agents and each Lender on demand for all reasonable costs and
expenses (including, without limitation, reasonable fees of counsel) incurred by
an Agent or such  Lender in  connection  with such  rescission  or  restoration,
including  any such costs and expenses  incurred in defending  against any claim
alleging  that such payment  constituted a  preference,  fraudulent  transfer or
similar payment under any bankruptcy, insolvency or similar law.

                  SECTION 4.6.  Remedies.  The Guarantors agree that, as between
the  Guarantors,  on the one hand, and the Agents and the Lenders,  on the other
hand, the Guaranteed Obligations may be declared to be forthwith due and payable
as  provided  in  ARTICLE  IX  hereof  (and  shall  be  deemed  to  have  become
automatically  due and  payable  in the  circumstances  provided  in  ARTICLE IX
hereof)  notwithstanding  any stay,  injunction or other prohibition  preventing
such  declaration  (or  preventing  such  Guaranteed  Obligations  from becoming
automatically  due and  payable)  as against any other  Person and that,  in the
event of such declaration (or such Guaranteed  Obligations  being deemed to have
become automatically due and payable),  such Guaranteed  Obligations (whether or
not due and payable by any other Person) shall forthwith  become due and payable
by the Guarantors.

                  SECTION  4.7.  Limitation  of  Guaranty.  Notwithstanding  any
provision  to the  contrary  contained  herein or in any of the  other  Facility
Documents,  to the extent the  obligations of any Guarantor shall be adjudicated
to be invalid or unenforceable for any reason  (including,  without  limitation,
because  of  any  applicable   state  or  federal  law  relating  to  fraudulent
conveyances or  transfers),  then the  obligations  of such Guarantor  hereunder
shall be limited to the maximum amount that is permissible  under applicable law
(whether  federal or state and  including,  without  limitation,  the Bankruptcy
Code).  The  Borrowers  and the  Guarantors  agree to enter into a  contribution
agreement  in form and  substance  satisfactory  to the  Agents on or before the
Initial  Funding Date providing for  contribution  and indemnity  among the Loan
Parties.

                  SECTION 4.8.  Release of Guaranty.  Upon  consummation  of the
sale,  conveyance,  or other transfer of all of the stock,  or other evidence of
beneficial  ownership,  of any  Guarantor in a  transaction  not  prohibited  by
SECTION 8.12 or SECTION  8.13 hereof,  so long as no Default or Event of Default
shall have occurred and be continuing,  the Guaranty of such Guarantor shall be,
and shall be deemed to be, released and discharged.


                                      -61-


                  SECTION 4.9. Borrowers.  To the extent that either Borrower is
determined to be a guarantor or surety of the  obligations of the other Borrower
under the Facility Documents, the provisions of this ARTICLE IV shall apply with
respect to such Borrower's obligations as if it were a Guarantor.



                                      -62-

                                    ARTICLE V
                         REPRESENTATIONS AND WARRANTIES

                  In order to induce the  Agents  and the  Lenders to enter into
this  Agreement  and to make the Loans  herein  provided  for,  the Loan Parties
hereby jointly and severally make the following  representations and warranties,
which shall survive the execution and delivery of the Facility Documents:

                  SECTION 5.1.  Organization and Good Standing.  Each Loan Party
is duly organized,  validly  existing and in good standing under the laws of its
jurisdiction of organization.  Each Loan Party (a) is duly qualified and in good
standing  and  authorized  to do  business  in every  other  jurisdiction  where
ownership of its properties or the conduct of its business  requires it to be so
qualified unless the failure to be so qualified,  in good standing or authorized
would not have a Material  Adverse  Effect and (b) has the requisite  corporate,
partnership,  limited  liability company or trust power and authority to own its
properties  and to carry on its business as now  conducted and as proposed to be
conducted.

                  SECTION  5.2. Due  Authorization.  Each Loan Party (a) has the
requisite corporate,  partnership,  limited liability company or trust power and
authority to execute,  deliver and perform this Agreement and the other Facility
Documents  to which it is a party,  to  consummate  the  transactions  set forth
herein and therein, and to incur the obligations herein and therein provided for
and  (b) is duly  authorized  to,  and  has  been  authorized  by all  necessary
corporate,  partnership,  limited liability company or trust action to, execute,
deliver and perform this Agreement and the other Facility  Documents to which it
is a party and to consummate the transactions set forth herein and therein.

                  SECTION 5.3. No Conflicts.  Neither the execution and delivery
of the Facility Documents, nor the consummation of the transactions contemplated
therein, nor performance of and compliance with the terms and provisions thereof
by the Loan  Parties  will (a) violate or  conflict  with any  provision  of, as
applicable,  their respective articles or certificate of incorporation or bylaws
or partnership  agreement or certificate of formation or operating  agreement or
certificate of trust, (b) violate,  contravene or conflict, in each case, in any
material  respect,  with any law,  regulation  (including,  without  limitation,
Regulation  U or  Regulation  X  promulgated  by the Board of  Governors  of the
Federal Reserve System),  order, writ,  judgment,  injunction,  decree or permit
applicable to any of them, (c) violate,  contravene or conflict with contractual
provisions  of,  or cause  an  event  of  default  under,  any  indenture,  loan
agreement, mortgage, deed of trust, contract or other agreement or instrument to
which any of them is a party or by which any of them may be bound, the violation
of which could have a Material  Adverse Effect,  or (d) result in or require the
creation of any Lien upon or with respect to any of their properties.

                  SECTION 5.4. Consents. No consent, approval,  authorization or
order  of,  or  filing,   registration  or  qualification  with,  any  court  or
Governmental  Authority  or third party in respect of any Loan Party is required
in connection  with the execution,  delivery or performance of this Agreement or
any of the other  Facility  Documents  by such Loan Party or to  consummate  the
transactions  set forth  herein and  therein,  the failure to obtain which could
have a Material Adverse Effect.


                                      -63-


                  SECTION 5.5. Enforceable  Obligations.  This Agreement and the
other  Facility  Documents  have been duly executed and delivered and constitute
legal,  valid  and  binding   obligations  of  each  Loan  Party  party  thereto
enforceable  against such Loan Party in accordance with their respective  terms,
except as may be limited  by  bankruptcy  or  insolvency  laws or  similar  laws
affecting creditors' rights generally or by general equitable principles.

                  SECTION  5.6. No  Default.  No Loan Party is in default in any
respect under any contract, lease, loan agreement, indenture, mortgage, security
agreement or other  agreement or  obligation  to which it is a party or by which
any of its  properties  is bound which default would have or would be reasonably
expected to have a Material  Adverse Effect.  No Default or Event of Default has
occurred or exists except as previously disclosed in writing to the Lenders.

                  SECTION 5.7.  Ownership.  As of the Execution  Date, each Loan
Party is the  owner  of,  and has  good  and  marketable  title  to,  all of its
respective  assets,  free and  clear of all  Liens  except  (a) as set  forth on
SCHEDULE  5.7 hereto,  (b)  Permitted  Encumbrances,  (c) Liens  provided for in
SECTION  8.1(F)  hereof,  and (d) Liens the existence or  enforcement  of which,
individually or in the aggregate, would not result in a Material Adverse Effect.
At all times after the Execution  Date, each Loan Party is the owner of, and has
good and marketable  title to, all of its respective  assets,  free and clear of
all Liens  except (x) as provided for in SECTION 8.1 hereof,  and (y)  Permitted
Encumbrances

                  SECTION   5.8.   Indebtedness.   The  Loan   Parties  have  no
Indebtedness except (a) as set forth on SCHEDULE 5.8 hereto and (b) as otherwise
permitted  by this  Agreement.  SCHEDULE  5.8 hereto  accurately  sets forth the
outstanding  principal amounts and the maturity dates of the Indebtedness of the
Loan Parties and identifies the holders of the obligations  thereunder as of the
date hereof.

                  SECTION 5.9. Litigation. There are no actions, suits or legal,
equitable,  arbitration  or  administrative  proceedings,  pending  or,  to  the
knowledge of any Loan Party, threatened against a Loan Party which could have or
might be reasonably expected to have a Material Adverse Effect.

                  SECTION 5.10.  Taxes.  Each Loan Party has filed, or caused to
be filed, all tax returns  (federal,  state,  local and foreign)  required to be
filed and paid (a) all  amounts  of taxes  shown  thereon  to be due  (including
interest and penalties)  and (b) all other taxes,  fees,  assessments  and other
governmental  charges  owing by it,  except for such taxes (i) which are not yet
delinquent  or (ii)  that  are  being  contested  in good  faith  and by  proper
proceedings,  and  against  which  adequate  reserves  are being  maintained  in
accordance  with GAAP.  No Loan Party is aware of any proposed  tax  assessments
against it.


                                      -64-

                  SECTION  5.11.  Compliance  with Law.  Each  Loan  Party is in
compliance with all laws,  rules,  regulations,  orders and decrees  (including,
without limitation,  Environmental Laws) applicable to it, or to its properties,
unless such failure to comply would not have a Material Adverse Effect.

                  SECTION 5.12. Subsidiaries.  Set forth on SCHEDULE 5.12 hereto
is a complete list of all direct and indirect  Subsidiaries of the Borrowers and
the  Guarantors  as of the date of this  Agreement  and the type and  amount  of
ownership of each.

                  SECTION 5.13. Use of Proceeds;  Margin Stock.  The proceeds of
the Loans  hereunder  will be used solely for the purposes  specified in SECTION
2.10  hereof.  None of the  proceeds  of the Loans,  and none of the  Letters of
Credit,  will be used for the  purpose of  purchasing  or  carrying  any "margin
stock" as defined in Regulation U or  Regulation X  promulgated  by the Board of
Governors  of the  Federal  Reserve  System,  or for the  purpose of reducing or
retiring any  indebtedness  which was  originally  incurred to purchase or carry
"margin  stock" or any "margin  security" or for any other  purpose  which might
constitute this  transaction a "purpose credit" within the meaning of Regulation
U,  Regulation X, or  Regulation T promulgated  by the Board of Governors of the
Federal Reserve System. None of the Loan Parties owns any "margin stock".

                  SECTION 5.14. Government Regulation.  No Loan Party is subject
to regulation  under the Public Utility Holding Company Act of 1935, the Federal
Power Act, the Investment  Company Act of 1940 or the  Interstate  Commerce Act,
each as  amended.  In  addition,  no Loan Party is (a) an  "investment  company"
registered  or required to be  registered  under the  Investment  Company Act of
1940, as amended,  or controlled by such a company,  or (b) a "holding company,"
or a  "subsidiary  company"  of a  "holding  company,"  or an  "affiliate"  of a
"holding  company"  or of a  "subsidiary"  or a  "holding  company,"  within the
meaning of the Public  Utility  Holding  Company  Act Of 1935,  as  amended.  No
director, executive officer or principal shareholder of any Loan Party or any of
its Subsidiaries is a director,  executive  officer or principal  shareholder of
any Lender.  For the purposes hereof the terms "director,"  "executive  officer"
and  "principal  shareholder"  (when used with reference to any Lender) have the
respective  meanings  assigned  thereto in  Regulation  O issued by the Board of
Governors of the Federal Reserve System.

                  SECTION 5.15.  Intellectual Property. Each Loan Party owns, or
has  the  legal  right  to  use,  all  service  marks,  trademarks,  tradenames,
copyrights,  technology,  know-how and resources (the  "Intellectual  Property")
necessary  for each of them to conduct to its  business as  currently  conducted
except for those the  failure to own or have which  legal right to use would not
have a Material Adverse Effect.


                                      -65-

                  SECTION 5.16.  Solvency.  Each Loan Party is and, after
consummation of the transactions contemplated by this Agreement,will be Solvent.

                  SECTION  5.17.  Disclosure.  To  the  best  knowledge  of  the
Borrowers,  neither this Agreement nor any financial statements delivered to the
Agents or the Lenders nor any other document, certificate or statement furnished
to the Agents or the  Lenders  by or on behalf of any Loan  Party in  connection
with the  transactions  contemplated  hereby contains any untrue  statement of a
material fact or omits to state a material  fact  necessary in order to make the
statements contained therein or herein not misleading.

                  SECTION  5.18.  Licenses,  etc. The Loan Parties have obtained
and  hold  in  full  force  and  effect,  all  franchises,   licenses,  permits,
certificates, authorizations,  qualifications, accreditations, easements, rights
of way and other  rights,  consents and  approvals  which are  necessary for the
operation of their respective  businesses as presently  conducted,  except where
the failure to obtain same would not have a Material Adverse Effect.

                  SECTION 5.19. No Burdensome  Restrictions.  No Loan Party is a
party to any agreement or  instrument or subject to any other  obligation or any
charter or corporate restriction or any provision of any applicable law, rule or
regulation which, individually or in the aggregate,  would have or be reasonably
expected to have a Material Adverse Effect.

                  SECTION 5.20.  ERISA. (i) Except as set forth on SCHEDULE 5.20
hereto,  neither any of the Loan Parties nor any ERISA Affiliate  maintains,  or
participates  in, or has at any time  maintained or  participated  in, any ERISA
Plan. The Loan Parties and each of their ERISA Affiliates are in compliance with
all applicable  provisions and  requirements  of ERISA and the  regulations  and
published interpretations thereunder with respect to each Employee Benefit Plan,
and have  performed  all their  obligations  under each  Employee  Benefit Plan,
execpt where the failure to so comply or perform is not  reasonably  expected to
have a Material Adverse Effect.

                  (ii) No ERISA Event has occurred or is reasonably  expected to
occur that is reasonably expected to have a Material Adverse Effect.

                  (iii) Except to the extent required under Section 4980B of the
Code, no Employee Benefit Plan provides health or welfare benefits  (through the
purchase of insurance or otherwise)  for any retired or former  employees of the
Loan Parties or any of their ERISA Affiliates.

                  (iv) As of the most  recent  valuation  date  for any  Pension
Plan,  the  amount of  unfunded  benefit  liabilities  (as  defined  in  Section
4001(a)(18)  of ERISA),  individually  or in the aggregate for all Pension Plans
(excluding  for purposes of such  computation  any Pension Plans with respect to
which assets exceed benefit liabilities), does not exceed $100,000.


                                      -66-

                  SECTION 5.21. Hazardous   Materials;   Asbestos.   Except   as
disclosed in SCHEDULE 5.21 hereto, to the knowledge of the Loan Parties:

                  (a)  The  Loan  Parties  are  in  compliance  with  all  Legal
Requirements  pertaining to Hazardous Materials the failure with which to comply
would  have a  Material  Adverse  Effect.  None of the  Properties  and no other
property  used by the Loan Parties is included or proposed for  inclusion on the
National  Priorities  List  issued  pursuant  to CERCLA or on the  Comprehensive
Environmental  Response Compensation and Liability Information System maintained
by the United  States  Environmental  Protection  Agency  (the  "EPA") or on any
analogous  list  maintained  by any  other  Governmental  Authority  and has not
otherwise been identified by the EPA as a potential CERCLA site.

                  (b) The Loan Parties have not, at any time, and, to the
actual  knowledge  of the  Borrower,  no other  Person  has at any  time,  used,
handled,   stored,   buried,   retained,   refined,   transported,    processed,
manufactured, generated, produced, spilled, released, allowed to seep, escape or
leach,  or pumped,  poured,  emitted,  emptied,  discharged,  injected,  dumped,
transferred  or otherwise  disposed of, any Hazardous  Materials at or about the
Properties  or any other real  property  owned or  occupied  by any Loan  Party,
except  (i) for use  and  storage  for use of  reasonable  amounts  of  ordinary
supplies and other  substances  customarily  used in the operation of commercial
office buildings;  PROVIDED, HOWEVER, that such use and/or storage for use is in
substantial  compliance with applicable Legal  Requirements,  or (ii) where such
action is not reasonably expected to have a Material Adverse Effect.

                  (c) No  actions,  suits,  or  proceedings  have  been
commenced,  are  pending  or,  to the  actual  knowledge  of the  Borrower,  are
threatened in writing with respect to any Legal Requirements  governing the use,
manufacture,   storage,  treatment,   Release,  disposal,   transportation,   or
processing  of  Hazardous  Materials  with  respect to any  Property or any part
thereof  which  could have a Material  Adverse  Effect.  The Loan  Parties  have
received  no  written  notice  of and  have no  actual  knowledge  of any  fact,
condition, occurrence or circumstance which could reasonably be expected to give
rise to a claim under or pursuant to any existing Legal Requirements  pertaining
to Hazardous  Materials  on, in, under or  originating  from any Property or any
part thereof or any other real  property  owned or occupied by any Loan Party or
arising out of the conduct of any Loan Party,  including claims for the presence
of Hazardous  Materials at any other  property,  which in any case is reasonably
expected to have a Material Adverse Effect.

                  (d) Other than as set forth in  reviews,  reports  and surveys
copies of which have been delivered to the Agents,  there have occurred no uses,
manufactures,  storage,  treatments,  Releases,  disposals,  transportation,  or
processing  of Hazardous  Materials  with  respect to any Property  except those
which, taken as a whole, would not have a Material Adverse Effect.


                                      -67-

                  SECTION 5.22. Mortgages.(a)The Borrowers or their Subsidiaries
are the sole owners and holders of each of the Mortgage Loans and the sole 
holders of the related Mortgage Notes acquired by the Borrowers or their 
Subsidiaries, and have good title to each  Mortgage Note and each Mortgage  Loan
acquired by the Borrowers or their Subsidiaries, free and clear of any Liens. 
The Borrowers or their Subsidiaries have not waived, modified, altered, 
satisfied,  cancelled or subordinated any Mortgage Note, any of the Mortgages or
any  Mortgage  Loan acquired by the  Borrowers or their  Subsidiaries  in any  
respect.  The related property has not been released from the lien of any
Mortgage,  nor has any maker been released from its obligations under any
 Mortgage Note.

                  (b) To the actual knowledge of the Authorized  Officers of the
     Borrowers,  each Mortgage Note and each related  Mortgage  acquired by the 
     Borrowers or their  Subsidiaries is  a  legal,   valid  and  binding  
     obligation  of  each  party  obligated thereunder,  enforceable  against
     such party in accordance  with its terms, except as the enforcement thereof
     may be limited by applicable  bankruptcy, insolvency,   reorganization,
     moratorium,   and  similar  laws  affecting creditors' rights generally and
     such Mortgage creates a first priority Lien on the property which is the
     subject of such Mortgage Note.

                  (c) To the actual knowledge of the Authorized  Officers of the
     Borrowers,  each Mortgage Loan acquired by the Borrowers or their 
     Subsidiaries was made in compliance with all Applicable  Laws, and does not
     violate  any  usury  or  similar  law regulating the applicable  maximum  
     permitted rates of interest for loans,extensions of credit or forbearances.

                  (d) To the actual knowledge of the Authorized  Officers of the
     Borrowers,  each Mortgage Note and each related Mortgage  acquired by the 
     Borrowers or their  Subsidiaries evidences an undisputed,  bona fide
     transaction  completed in accordance in all  material  respects  with the
     terms  and  provisions  contained  in any documents  related  thereto,
     and is genuine and free from adverse  claims, setoffs, defaults, defenses, 
     retainages, holdbacks and conditions precedent of any kind or character;  
     and the Borrowers  have no knowledge of any fact or circumstance  which 
     would impair the validity or  collectibility  of any such Mortgage Note.

                  (e) No Mortgage Loan acquired by the Borrowers or their
     Subsidiaries  is in default  beyond the expiration  of any  applicable  
     grace or notice  periods,  and  during  the preceding  twelve (12) months,
     there has been no default in the payment of regularly  scheduled  principal
     and interest  thereunder,  except for such defaults which, individually or 
     in the aggregate, shall not have a Material Adverse Effect.

                                      -68-


                  SECTION 5.23.  Federal Tax Matters. (i) Cornerstone has at all
 times since 1983 elected to be taxed as a REIT under the Code.

                  (ii) None of the Loan Parties is a "foreign person" within the
meaning of Section 1445 or 7701 of the Code.

                  SECTION 5.24. Year 2000. The Borrowers have initiated a review
and  assessment  of all  areas  within  their  and each of  their  Subsidiaries'
businesses  and  operations  that could be  adversely  affected by the risk that
computer  applications  may not be able to recognize  and properly  perform date
sensitive  functions after December 31, 1999. Based on the foregoing,  each Loan
Party believes that all computer applications that are material to its or any of
its  Subsidiaries'  business and operations  are reasonably  expected to be Year
2000  Compliant,  except to the extent that a failure to do so is not reasonably
expected to have a Material Adverse Effect.

                  SECTION 5.25. Financial  Statements.  The financial statements
most recently  delivered by the Loan Parties pursuant to SECTION 7.1 hereof were
prepared in accordance with GAAP consistently  applied and fairly present in all
material  respects the financial  condition and the results of operations of the
Loan  Parties and their  Subsidiaries  covered  thereby on the dates and for the
periods  covered  thereby,  except as disclosed in the notes  thereto and,  with
respect to interim financial statements,  subject to normally recurring year-end
adjustments.


                                      -69-


                                   ARTICLE VI
                              CONDITIONS PRECEDENT

                  SECTION 6.1. Conditions to Making of Loans. (a) The occurrence
of the Initial Funding Date is subject to the satisfaction of the following 
conditions precedent:

          (i) The  Administrative  Agent shall have received on behalf of
     the Agents and the  Lenders,  on or before the Initial  Funding  Date,  the
     following,  each in  form  and  substance  reasonably  satisfactory  to the
     Administrative Agent in all respects:

         (1) AN ORIGINAL  COUNTERPART OF THIS AGREEMENT AND AN ORIGINAL NOTE FOR
     EACH INITIAL LENDER, EXECUTED BY AUTHORIZED OFFICERS OF THE BORROWERS;

         (2) A COPY OF THE ARTICLES OR CERTIFICATE OF INCORPORATION, PARTNERSHIP
     AGREEMENT,  CERTIFICATE OF LIMITED  PARTNERSHIP,  LIMITED LIABILITY COMPANY
     AGREEMENT,  OR DECLARATION  OF TRUST,  AS THE CASE MAY BE, OF THE BORROWERS
     AND EACH OF THE GUARANTORS AND ALL  AMENDMENTS  THERETO,  CERTIFIED AS OF A
     RECENT  DATE  BY THE  APPROPRIATE  STATE  OFFICIAL,  AND  CERTIFIED  BY THE
     SECRETARY OR AN ASSISTANT  SECRETARY OF EACH OF THE  BORROWERS  AND EACH OF
     THE GUARANTORS (OR ITS GENERAL  PARTNER,  AS THE CASE MAY BE) TO THE EFFECT
     THAT SUCH DOCUMENTS OR INSTRUMENTS HAVE NOT BEEN AMENDED SINCE SUCH DATE;

         (3) A COPY OF THE BY-LAWS OR OPERATING  AGREEMENT,  AS  APPLICABLE,  OF
     CORNERSTONE  AND EACH OF THE  GUARANTORS  AS IN  EFFECT  AS OF THE  INITIAL
     FUNDING  DATE,  CERTIFIED  BY A SECRETARY  OR  ASSISTANT  SECRETARY  OF THE
     BORROWER AND EACH OF THE GUARANTORS;

         (4) A COPY OF THE RESOLUTIONS OF THE BOARD OF DIRECTORS OR MEMBERS,  OR
     PARTNERSHIP  CONSENT, AS THE CASE MAY BE, OF EACH OF THE BORROWERS AND EACH
     OF THE GUARANTORS OR THEIR RESPECTIVE GENERAL PARTNERS, AS THE CASE MAY BE,
     APPROVING EACH OF THE FACILITY DOCUMENTS TO WHICH IT IS A PARTY AND EACH OF
     THE OTHER  INSTRUMENTS  AND  DOCUMENTS TO BE EXECUTED BY THE  BORROWERS AND
     EACH OF THE  GUARANTORS AND DELIVERED TO THE  ADMINISTRATIVE  AGENT AND THE
     LENDERS  PURSUANT TO THIS  Section  6.1(a),  CERTIFIED BY A SECRETARY OR AN
     ASSISTANT  SECRETARY OF EACH OF THE BORROWERS (OR ITS GENERAL  PARTNER,  AS
     THE CASE MAY BE) AND EACH OF THE  GUARANTORS,  AND CERTIFIED  COPIES OF ALL
     DOCUMENTS  EVIDENCING  OTHER NECESSARY  CORPORATE  ACTION AND  GOVERNMENTAL
     APPROVALS, IF ANY, WITH RESPECT THERETO;

                                      -70-


         (5) A CERTIFICATE  OF A SECRETARY OR AN ASSISTANT  SECRETARY OF EACH OF
     THE BORROWERS (OR ITS GENERAL PARTNER,  AS THE CASE MAY BE) AND EACH OF THE
     GUARANTORS  CERTIFYING  THE NAMES  AND TRUE  SIGNATURES  OF THE  AUTHORIZED
     OFFICERS OF EACH OF THE BORROWERS AND EACH OF THE GUARANTORS  AUTHORIZED TO
     SIGN EACH  DOCUMENT TO WHICH IT IS A SIGNATORY AND WHICH IS TO BE DELIVERED
     BY IT HEREUNDER OR PURSUANT TO ANY OTHER FACILITY DOCUMENT;

         (6) AN  OPINION  OR  OPINIONS  OF  COUNSEL  TO THE  BORROWERS  AND  THE
     GUARANTORS,  SUBJECT TO CUSTOMARY LIMITATIONS AND QUALIFICATIONS,  COVERING
     SUCH MATTERS INCIDENT TO THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT TO
     OCCUR ON OR BEFORE THE INITIAL FUNDING DATE AS THE ADMINISTRATIVE  AGENT OR
     THE REQUIRED LENDERS REASONABLY MAY REQUEST, INCLUDING, WITHOUT LIMITATION,
     AS TO  THE  DUE  AUTHORIZATION,  EXECUTION  AND  DELIVERY  BY  EACH  OF THE
     BORROWERS AND EACH OF THE GUARANTORS AND THE ENFORCEABILITY OF ALL FACILITY
     DOCUMENTS  DELIVERED  PURSUANT TO THIS Section 6.1(a),  AND COMPLIANCE WITH
     MARGIN REGULATIONS;

         (7) TITLE  INSURANCE  RESPECTING  EACH OF THE  EXISTING  PROPERTIES  AS
     EVIDENCED  BY COPIES OF THE MOST RECENT  FULLY  EFFECTIVE  TITLE  INSURANCE
     POLICIES (OR MARKED AND SIGNED TITLE  INSURANCE  BINDERS TO THE EXTENT SUCH
     POLICIES  HAVE NOT BEEN ISSUED OR ARE NOT OTHER  OTHERWISE  AVAILABLE)  AND
     CURRENT  UNIFORM  COMMERCIAL CODE LIEN SEARCHES ON THE BORROWER AND EACH OF
     THE  GUARANTORS  IN SUCH  JURISDICTIONS  AS THE  ADMINISTRATIVE  AGENT  MAY
     REASONABLY REQUIRE;

          (8)  the  Pledge   Agreement,executed   by   Cornerstone  LP  and  the
     Administrative Agent;

          (9) a contribution agreement,  pursuant to SECTION 4.7 hereof, in form
     and substance  satisfactory to the Agents  providing for  contribution  and
     indemnity among the Loan Parties;

          (10) ALL CERTIFICATES AND INSTRUMENTS REPRESENTING COLLATERAL (AS SUCH
     TERM IS DEFINED IN THE PLEDGE AGREEMENT),  ALL DOCUMENTS THE ADMINISTRATIVE
     AGENT MAY REASONABLY  REQUEST  EVIDENCING THAT THE SECURITIES  AND/OR OTHER
     ASSETS OF THE BORROWERS  PLEDGED AS COLLATERAL  (AS SUCH TERM IS DEFINED IN
     THE PLEDGE AGREEMENT) SHALL BE SUBJECT TO THE TERMS OF THE PLEDGE AGREEMENT
     AND  THAT  ALL  REGISTRATIONS,  FILINGS  AND  OTHER  ACTIONS  NECESSARY  OR
     DESIRABLE TO CREATE A PERFECTED  FIRST PRIORITY  SECURITY  INTEREST IN SUCH
     SECURITIES  AND/OR  OTHER  ASSETS AND ALL  PROCEEDS  THEREOF  SECURING  THE
     OBLIGATIONS OF THE BORROWERS HEREUNDER HAVE OCCURRED; AND


                                      -71-


          (11)  EVIDENCE  OF  INSURANCE   REQUIRED  UNDER  Section  7.6  HEREOF,
     REASONABLY SATISFACTORY TO THE ADMINISTRATIVE AGENT.

          (ii)  The  Administrative  Agent on behalf of the Agents and the
     Lenders shall have received all  information  and copies of all  documents,
     including,  without  limitation,  records of  requisite  corporate or other
     approvals,  actions and proceedings which the Administrative  Agent and its
     counsel  reasonably  may  have  requested  in  connection  therewith,  such
     documents, where so requested, to be certified by appropriate Persons.

          (iii) The Borrowers  shall have paid to the Agents all fees owing
     under  the  Fee  Letter,  and  the  Loan  Parties  shall  have  paid to the
     Administrative  Agent all third-party  fees, costs and expenses incurred or
     sustained  by the  Administrative  Agent,  the  Syndication  Agent  and the
     Documentation  Agent  (including all attorneys' fees and  disbursements  of
     independent  counsel  retained by them) in connection with the preparation,
     execution and delivery of this Agreement,  the other Facility Documents and
     any related documents and the other transactions contemplated by ARTICLE II
     hereof.

          (iv) The Loan Parties shall have paid to the Administrative  Agent all
     fees then due pursuant to SECTION 3.1 hereof.

          (v)  Each of the  representations  and  warranties  made in or
     pursuant to any Facility Document shall be true and correct in all material
     respects when made and on and as of the Initial Funding Date (except to the
     extent  any  representation  or  warranty  expressly  relates to an earlier
     date).

          (vi) No Default or Event of Default  shall have  occurred and be
     continuing  on such date or after giving  effect to the  occurrence  of the
     Initial  Funding  Date  and all  other  transactions  contemplated  by this
     ARTICLE VI.


                                      -72-

          (vii) No event,  act or  condition  having or causing a Material
     Adverse Effect shall have occurred since September 30, 1998.

          (viii) The transactions contemplated by the WWA Merger Agreement shall
     have been consummated in accordance with all applicable laws.

          (ix)  The Loan  Parties  shall  have paid (or made  arrangements
     satisfactory to the Administrative Agent to pay) in full all loans, accrued
     interest and fees, and expenses and indemnities owing to the agents and the
     lenders under the Existing Credit Agreement.

                  (b) The  obligations  of any Lender to fund  Loans  (including
Loans made on the Initial Funding Date) and of the Issuing Bank to issue, renew,
amend,  or extend any Letter of Credit are  subject to the  satisfaction  of the
following conditions precedent:

          (i) THE  ADMINISTRATIVE  AGENT SHALL HAVE  RECEIVED A LOAN  REQUEST OR
     LETTER OF CREDIT  REQUEST,  AS THE CASE MAY BE,  EXECUTED BY AN  AUTHORIZED
     OFFICER OF A BORROWER AND  SUBMITTED ON OR BEFORE THE  APPLICABLE  TIME SET
     FORTH IN Section 2.4(a) HEREOF.

          (ii) The Loan Parties shall have paid to the Administrative  Agent all
     fees then due pursuant to SECTION 3.1 hereof.

          (iii) The Administrative  Agent shall have received,  on behalf of the
     Agents  and  the  Lenders,  an  Officer's   Certificate  from  Cornerstone,
     individually and as sole general partner of Cornerstone LP, certifying that
     (1) each of the  representations  and warranties made in or pursuant to any
     Facility  Document shall be true and correct in all material  respects when
     made and on and as of the applicable Funding Date (except to the extent any
     representation or warranty expressly relates to an earlier date or has been
     revised  as  expressly  permitted  herein),  and (2) no Default or Event of
     Default  shall have  occurred and be  continuing  on such date after giving
     effect to the making of the Loans requested in the applicable Loan Request.


                                      -73-

(c) In the event that the Initial Funding Date does not occur before the earlier
to occur of (i)  January 31,  1999 and (ii) the date of  termination  of the WWA
Merger  Agreement in accordance with the provisions of Section 18 thereof,  this
Agreement and the Commitments  shall  immediately  terminate without any further
action or notice on the part of the  Borrowers,  the Agents or the Lenders,  and
the Facility Documents shall be null and void and of no force and effect, except
to the extent  that any  provisions  of the  Facility  Documents  by their terms
survive termination of the Facility Documents;  provided,  however,  that in the
event that,  as of January 4, 1999 (A) the Division of Corporate  Finance of the
United States Securities and Exchange Commission has not completed the review of
the  preliminary  proxy  solicitation  materials  in  respect  of the WWA Merger
Agreement,  and  (B)  the WWA  Merger  Agreement  has  not  been  terminated  in
accordance  with the  provisions of Section 18 thereof,  the  Borrowers  may, by
written  notice  delivered to the  Administrative  Agent on or before 2:00 PM on
January 4, 1999,  extend the date set forth in CLAUSE (I) of this SECTION 6.1(C)
to a date no later than February 28, 1999. Until the conditions precedent to the
making of the Loans on the  Initial  Funding  Date occur or are  satisfied,  the
Existing  Agreement shall be in full force and effect,  without giving effect to
any amendment or modification set forth in this Agreement.


                                      -74-



                                   ARTICLE VII
                              AFFIRMATIVE COVENANTS

     The Loan Parties jointly and severally  covenant and agree that,  until the
Commitments have been terminated and the Notes, together with interest,  and all
other  Indebtedness  of the  Loan  Parties  to  the  Administrative  Agent,  the
Syndication Agent, the Documentation  Agent and the Lenders under this Agreement
and the other Facility  Documents,  are paid in full, unless specifically waived
in writing by the Required Lenders:

                  SECTION 7.1. Financial  Statements and Other Information.  The
Loan Parties shall furnish to the Administrative Agent:

                  (a)  Quarterly  Financial   Statements.   As  soon  as
         practicable  and in any event within 45 days after the close of each of
         the first three  fiscal  quarters  of each fiscal year of  Cornerstone,
         consolidated balance sheets of the Loan Parties and their Subsidiaries,
         consolidated  statements  of income and  retained  earnings of the Loan
         Parties and their  Subsidiaries,  and  consolidated  statements of cash
         flow of the Loan Parties and their  Subsidiaries,  as at the end of and
         for the  quarterly  period  then  ended  and as at and  for the  period
         commencing at the end of the previous  fiscal year and ending with such
         quarter,  all in reasonable detail and certified by the chief financial
         officer of Cornerstone to be true and correct in all material  respects
         and to have been  prepared  in  accordance  with GAAP  (except  for the
         omission of  footnotes),  subject to normal  recurring  year-end  audit
         adjustments;

                  (b) Annual Financial Statements. As soon as practicable and in
         any  event  within  90  days  after  the  end of  each  fiscal  year of
         Cornerstone  commencing  with the fiscal year ending December 31, 1998,
         consolidated balance sheets of the Loan Parties and their Subsidiaries,
         consolidated  statements  of income and  retained  earnings of the Loan
         Parties and their  Subsidiaries,  and  consolidated  statements of cash
         flow of the Loan Parties and their Subsidiaries, prepared in accordance
         with GAAP, as at the end of and for the fiscal year just closed, all in
         reasonable detail,  presented in a manner consistent with the financial
         statements for the preceding fiscal year (if any), and, with respect to
         such consolidated  statements,  certified (without any going concern or
         scope   of  audit   qualification)   by   PricewaterhouseCoopers   LLP,
         independent  certified  public  accountants,  or  such  other  firm  of
         independent   certified  public  accountants  of  recognized   national
         standing as the Borrowers may select from time to time;

                                      -75-

                  (c)  No   Default   Reports   and   Compliance   Certificates.
         Concurrently with the delivery of the financial  statements required to
         be furnished under SECTIONS 7.1(A) AND 7.1(B) hereof, a certificate, in
         the form  annexed  hereto as EXHIBIT H,  signed by the chief  financial
         officer of  Cornerstone  individually  and as sole  general  partner of
         Cornerstone  LP, and  promptly  upon the  occurrence  of any Default or
         Event of Default,  certificates  signed by  Authorized  Officers of the
         Loan Parties  stating (A) that a review of the  activities  of the Loan
         Parties  during  such  period  has  been  made  under  their  immediate
         supervision  with a view to  determining  whether the Loan Parties have
         observed,  performed and fulfilled all of their  obligations  under the
         Facility  Documents,  and (B) that there existed  during such period no
         Default or Event of Default or if any such  Default or Event of Default
         has occurred and is  continuing,  specifying  the nature  thereof,  the
         period of existence thereof and what action the Loan Parties propose to
         take, or have taken, with respect thereto;  each such certificate shall
         be accompanied by a schedule  setting forth the  computations as of the
         end of such period of each of the financial  ratios or tests  specified
         in SECTION 8.5 THROUGH 8.10 hereof,  if any, that are applicable to the
         Loan Parties;

                  (d) Management Letters.  Concurrently with the delivery
         of the  financial  statements  required to be furnished  under  SECTION
         7.1(B)  hereof,  any  management  letters  prepared by the  independent
         certified  public  accountants  of the Loan  Parties  described  above,
         setting forth any weaknesses in the  accounting and control  procedures
         of the Loan Parties;

                  (e) Accountants'  Certification.  Concurrently with the
         delivery of the  financial  statements  required to be furnished  under
         SECTION 7.1(B) hereof, a written statement of the independent certified
         public accountants of the Loan Parties described above stating that, in
         connection  with  their  audit  examination,   nothing  came  to  their
         attention  that caused them to become  aware of any Default or Event of
         Default  that  has  occurred  and is  continuing  and that  relates  to
         financial  or other  accounting  matters  or the  financial  ratios and
         restrictions  contained in ARTICLE VIII hereof, or, if such accountants
         have become aware of such event,  describing it (such written statement
         may be  qualified by a  certification  of such  accountants  that their
         audit was not directed  primarily  toward  obtaining  knowledge of such
         events);

                  (f) SEC Filings and Press Releases. Promptly upon their
         becoming available,  copies of (i) all financial  statements,  reports,
         notices and proxy  statements  sent or made available  generally by the
         Borrowers to their respective  security  holders,  (ii) all regular and
         periodic  reports and all registration  statements  (other than on Form
         S-8 or a similar form) and  prospectuses,  if any, filed by Cornerstone
         with the NYSE, any other securities exchange or with the Securities and
         Exchange  Commission  or any other  Governmental  Authority  or private
         regulatory authority, and (iii) all press releases and other statements
         made  available   generally  by  the  Loan  Parties  or  any  of  their
         Subsidiaries  to the public  concerning  material  developments  in the
         business of the Loan Parties or such Subsidiary;


                                      -76-

                  (g) Rent Rolls.  If  requested  by the  Administrative
         Agent, a true, complete and correct Rent Roll for each Property for the
         fiscal  quarter  ending  not less than 45 days  prior to such  request,
         accompanied  by an  Officer's  Certificate,  dated  as of the  date  of
         delivery  of such Rent  Roll,  certifying  that such Rent Roll is true,
         correct and complete in all material respects.

                  (h) Governmental Notices. Promptly upon the issuance or
         filing or receipt  thereof,  copies of all  material  reports,  written
         notices and other materials sent by the Loan Parties to, or received by
         the Loan Parties from, any Governmental  Authority (including,  without
         limitation, the Internal Revenue Service and the PBGC);

                  (i) ERISA  Events  and  Notices.  (i)  promptly  upon
         becoming  aware of the  occurrence of any ERISA Event, a written notice
         specifying the nature  thereof,  what action the Loan Parties or any of
         their ERISA  Affiliates  has taken,  is taking or proposes to take with
         respect thereto and, when known,  any action taken or threatened by the
         Internal  Revenue  Service,  the  Department  of Labor or the PBGC with
         respect  thereto;  and (ii) with reasonable  promptness,  copies of (A)
         each Schedule B (Actuarial Information) to the annual report (Form 5500
         Series)  filed  by  the  Borrowers  or any of  their  respective  ERISA
         Affiliates  with the  Internal  Revenue  Service  with  respect to each
         Pension  Plan;  (B) all notices  received by the Loan Parties or any of
         their ERISA Affiliates from a Multiemployer  Plan sponsor concerning an
         ERISA Event;  and (C) such other documents or  governmental  reports or
         filings  relating to any Employee  Benefit  Plan as the  Administrative
         Agent shall reasonably request;

                  (j) Environmental  Reporting. As soon as practicable following
         receipt  thereof,  copies  of all  environmental  audits  and  reports,
         whether  prepared  by  personnel  of  the  Loan  Parties  or any of its
         Subsidiaries or by independent consultants, with respect to significant
         environmental  matters at any Property or which relate to a claim under
         Environmental  Laws, which in any case is reasonably expected to have a
         Material Adverse Effect; and

                  (k)  Other  Information.   With  reasonable  promptness,  such
         additional  information regarding the business,  financial or corporate
         affairs of the Loan Parties as the Administrative Agent, at the request
         of any Lender, reasonably may request from time to time.


                                      -77-

                  SECTION 7.2. Notice of Certain Events.  The Loan Parties shall
     give written notice to the Administrative Agent:

                  (a) promptly upon obtaining  knowledge thereof, of any written
         notice of a violation or violations received by the Loan Parties or any
         of their  Subsidiaries  from any Governmental  Authority which, if such
         violation or violations were established,  could reasonably be expected
         to have a Material Adverse Effect;

                  (b) promptly upon obtaining  knowledge thereof, of any Default
         or Event of Default,  specifying the nature and extent thereof and what
         action the Loan Parties  propose to take,  or have taken,  with respect
         thereto;

                  (c) promptly upon obtaining  knowledge thereof,  of any breach
         or default by any of the Loan Parties or any of their  Subsidiaries  or
         Affiliates with respect to any material term of (A) any evidence of any
         secured or recourse  Indebtedness,  any Contingent  Obligation,  or any
         Property Obligation or (B) any loan agreement,  mortgage,  indenture or
         other agreement relating to such Indebtedness, Contingent Obligation or
         Property  Obligation,  if the  effect of such  breach or  default is to
         cause, or permit the holder or holders of that Indebtedness, Contingent
         Obligation  or  Property  Obligation  (or a  trustee  on behalf of such
         holder or holders) or agreement  described in the foregoing  subclauses
         (ii)(A) and (ii)(B) to cause, that Indebtedness,  Contingent Obligation
         or Property  Obligation  to become or be declared due and payable prior
         to  its  stated  maturity  or the  stated  maturity  of any  underlying
         obligation, as the case may be (upon the giving or receiving of notice,
         lapse of time, both, or otherwise), or to allow the contraparty to such
         Property Obligation to terminate such Property Obligation;

                  (d) promptly upon obtaining  knowledge  thereof,  of any other
         matter or matters that have or cause or could reasonably be expected to
         have or cause a Material Adverse Effect;

                  (e)  promptly  upon  obtaining   knowledge  thereof,   of  any
         attachment,  judgment,  lien,  levy or order  which may be placed on or
         assessed  against or threatened in writing  against a Loan Party or any
         of its Subsidiaries which is material to any Loan Party;

                  (f) promptly,  and in any event within 10 days of a good faith
         determination of an Authorized Officer of a Loan Party, of all legal or
         arbitral proceedings or investigations (including,  without limitation,
         by any Governmental Authority) against or relating to any Loan Party or
         any  Property  that (either  individually  or in the  aggregate)  could
         reasonably  be expected to have a Material  Adverse  Effect and, to the
         extent  permitted by law and requested by the  Administrative  Agent, a
         copy of all material  documents  served on the Loan Parties relating to
         any such proceeding or investigation;


                                      -78-

                  (g) promptly,  and in any event within 10 days after obtaining
         knowledge   thereof,   of  all  legal  or   arbitral   proceedings   or
         investigations  affecting the Loan Parties or any of their Subsidiaries
         that:

                    (i)   question   or   challenge    either   the    validity,
               enforceability or priority of any Facility Document; or

                    (ii) seek to rescind,  terminate,  revoke, cancel, withdraw,
               suspend,  modify or withhold any necessary and material  license,
               permit, registration or membership of the Loan Parties;

         and, to the extent permitted by law and requested by the Administrative
         Agent, a copy of all documents  served on the Loan Parties  relating to
         any such proceeding or investigation;

                  (h) promptly,  and in any event within 10 days after obtaining
         knowledge   thereof,   of  all  legal  or   arbitral   proceedings   or
         investigations  (i) affecting any of the Properties or (ii) arising out
         of or in respect of any Property  Obligations,  and which, in any case,
         if  adversely  determined,  is  reasonably  expected to have a Material
         Adverse Effect;

                  (i)  promptly  upon  obtaining  knowledge  thereof,  any fact,
         condition,   occurrence  or  circumstance  which  could  reasonably  be
         expected  to give rise to a claim  under or  pursuant  to any  existing
         Legal Requirements  pertaining to Hazardous  Materials on, in, under or
         originating  from any  Property  or any part  thereof or any other real
         property  owned or  occupied  by any Loan Party or  arising  out of the
         conduct  of any  Loan  Party,  including  claims  for the  presence  of
         Hazardous  Materials at any other  property,  and in each case which in
         any case is reasonably expected to have a Material Adverse Effect;

                  (j)  promptly,  and in any event not less than 2 Business Days
         after  the  occurrence,  of  any  event  giving  rise  to  a  mandatory
         prepayment of the Loans under SECTION 2.7(B) hereof;

                  (k) promptly,  and in any event no later than 10 days prior to
         the  occurrence  thereof,  of any  sales or  purchases  of assets in an
         amount in excess of  $10,000,000  in book value and of any issuances of
         debt or equity securities or incurrences of any  Indebtedness,  in each
         case by any of the Loan Parties; and


                                      -79-

                  (l) promptly, and in any event within 1 Business Day after the
         occurrence  thereof,  any change in the senior  unsecured  indebtedness
         rating of either Borrower from Moody's or S&P.

For the  purposes of this  SECTION  7.2, the Loan Parties will be deemed to have
and obtain  knowledge of any event or condition when any  Authorized  Officer of
the Loan Parties has or obtains actual knowledge thereof.

          SECTION 7.3.  Maintain  Existence.  Except as permitted  under SECTION
     8.13 OR 8.18 hereof,  the Loan Parties and each of their Subsidiaries shall
     do or cause to be done all things necessary to preserve,  renew and keep in
     full force and effect  their  respective  corporate,  partnership,  limited
     liability company or trust existence,  as the case may be, and all material
     rights, licenses,  permits and franchises required or useful in the conduct
     of its business.

          SECTION 7.4. Qualified Income Covenant;  Cornerstone Common Stock. (a)
     Each Borrower will conduct its affairs and the affairs of its  Subsidiaries
     in a manner  so as to  continue  to  qualify  Cornerstone  as a REIT  under
     Sections 856-886 of the Code.

          (b) Cornerstone shall at all times hereafter (i) cause the Cornerstone
     Common  Stock to be duly  listed  on the  NYSE,  and (ii)  timely  file all
     reports required to be filed by it with the NYSE.

          SECTION 7.5.  Taxes and Claims.  The Loan  Parties  shall duly pay and
     discharge:

                  (a) all taxes,  assessments and  governmental  charges upon or
         against the Loan  Parties or their  properties  or assets  prior to the
         date on which penalties  attach thereto,  unless and to the extent that
         the  validity of such  charges is being  diligently  contested  in good
         faith by appropriate  proceedings  and adequate  reserves in conformity
         with GAAP have been provided therefor on the books of the Loan Parties;

                  (b) all lawful Indebtedness, obligations and claims for labor,
         materials,   supplies,   services  or  otherwise   (including   without
         limitation,  obligations  as a tenant under leases)  which,  if unpaid,
         could  reasonably  be expected to become a Lien upon property of a Loan
         Party (other than a Lien  permitted by SECTION 8.1 hereof),  unless and
         to the extent that the  validity of such  Indebtedness,  obligation  or
         claim is  being  diligently  contested  in good  faith  by  appropriate
         proceedings  and adequate  reserves in  conformity  with GAAP have been
         provided therefor on the books of the Loan Parties; and


                                      -80-

                  (c) all legally  required  contributions  to Employee  Benefit
         Plans and  Multiemployer  Plans  and all  legally  required  withdrawal
         liability payments.

          SECTION 7.6. Insurance. (a) The Loan Parties shall (i) keep all of the
     Properties  adequately  insured  at all times  with  responsible  insurance
     carriers against loss or damage by fire and other hazards and (ii) maintain
     adequate insurance at all times with responsible carriers against liability
     on account  of damage to  persons  and  property  and under all  applicable
     workmen's  compensation  laws. For the purposes of this SECTION 7.6(A), (x)
     insurance on Unencumbered  Properties  shall be deemed adequate if the same
     is not less  extensive  in  coverage  and  amount  (1) than is  customarily
     maintained on Class A office  properties  by other  Persons  engaged in the
     same or similar business  similarly  situated,  and (2) than is customarily
     required  by  lenders  to be  maintained  on Class A office  properties  in
     connection  with real  property  financing  secured  by or  otherwise  with
     recourse  to  such  office  properties,  and  (y)  insurance  on all  other
     Properties shall be deemed adequate if maintained in coverage and amount in
     accordance  with the  requirements  of any  mortgages on or financing  with
     recourse to such Properties.

                  (b)  The  Loan  Parties,  from  time to time  upon the
reasonable request of the Administrative  Agent, promptly shall furnish or cause
to be furnished to the  Administrative  Agent  evidence,  in form and  substance
reasonably  satisfactory to the Administrative  Agent, of the maintenance of all
insurance  reasonably  required  by  SECTION  7.6(A)  hereof  to be  maintained,
including,  but not limited to, such  originals or copies as the  Administrative
Agent reasonably may request of policies,  certificates of insurance, riders and
endorsements relating to such insurance and proof of premium payments.

          SECTION 7.7.  Books and Records;  Fiscal Year.  The Loan Parties shall
     maintain,  at all times,  true and complete books,  records and accounts in
     which  true  and  correct  entries  shall  be made of its  transactions  in
     accordance with GAAP consistently applied and in compliance in all material
     respects with the  applicable  regulations  of any  Governmental  Authority
     having jurisdiction. No Loan Party shall change its fiscal year.

          SECTION  7.8.  Maintain  Properties  and Rights.  (a) The Loan Parties
     shall,  and  shall  cause  each  of  their   Subsidiaries  to,  keep  their
     properties,  including the Existing Properties, the New Properties, and the
     Unencumbered  Properties,  in good  repair,  working  order  and  condition
     (subject  to such  wear and tear as may  occur in the  ordinary  course  of
     business)  and,  from time to time,  make all needful  and proper  repairs,
     renewals,  replacements,  additions and improvements  thereto,  so that the
     business  carried on may be properly  and  advantageously  conducted at all
     times in accordance with reasonably prudent business management.


                                      -81-

                  (b) The Loan  Parties  shall,  and shall  cause  each of their
Subsidiaries  to,  maintain the  ownership of, or the right to use, all material
patents,   trademarks,   service  marks,  trade  names,   copyrights  and  other
intellectual  property used or useful in the conduct of their business,  free of
any and all claims of infringement  or violation,  unless and to the extent that
the  validity  of such  claim is being  diligently  contested  in good  faith by
appropriate  proceedings and adequate reserves in conformity with GAAP have been
provided therefor on the books of the Loan Parties.

                  (c) Notwithstanding the foregoing,  the Loan Parties shall not
be  obligated to take any action that could  reasonably  be expected to void any
applicable  exemption  from  liability  with  respect  to  the  matters  covered
hereunder.

          SECTION  7.9.   Inspection  by   Administrative   Agent  and  Lenders;
     Appraisals.  (a)  The  Loan  Parties  shall  allow  any  representative  or
     representatives  of  the  Administrative  Agent  from  time  to  time  upon
     reasonable prior notice to visit and inspect any of the offices of the Loan
     Parties and any  Properties,  to examine and audit the books of account and
     other records and files of the Loan Parties,  to make copies thereof and to
     discuss the  affairs,  business,  finances and accounts of the Loan Parties
     with its  officers  and  employees,  all at such  reasonable  times  and as
     reasonably requested by the Administrative Agent;  PROVIDED,  HOWEVER, that
     such representative uses reasonable efforts not unduly to interfere with or
     delay the reasonable operation of normal business.

        (b) The Administrative  Agent may from time to time obtain Appraisals of
any assets or property of the Loan Parties, and the Loan Parties shall cooperate
fully with the appraiser  selected by the  Administrative  Agent to conduct such
Appraisals.  In the event that the Loan  Parties  obtain an  appraisal of one or
more of the Properties other than pursuant to this subsection,  the Loan Parties
shall at their expense  deliver a copy of such  appraisal to the  Administrative
Agent  promptly upon the  completion  thereof and the  Administrative  Agent may
elect,  in its sole  discretion  and subject to  Applicable  Laws, to treat such
appraisal as an "Appraisal."

          SECTION  7.10.  Pay  Indebtedness  and Perform  Obligations.  The Loan
     Parties shall:

                  (a) make full and timely  payments of all amounts  owed by the
         Loan Parties to the  Administrative  Agent, the Syndication  Agent, the
         Documentation Agent and the Lenders,  whether now existing or hereafter
         arising,

                  (b) duly comply in all  material  respects  with all the terms
         and  covenants  contained  in each  of the  instruments  and  documents
         furnished in connection with or pursuant to this Agreement or the other
         Facility Documents, and

                  (c) duly comply in all material  respects with all  applicable
         provisions  of  all  other  material  agreements,  indentures,  leases,
         contracts  and other  documents  (including,  but not  limited  to, all
         Property  Obligations)  binding  upon  any  Loan  Party  or  any or its
         properties  or assets,  except  where  noncompliance  would not have or
         cause a Material Adverse Effect,


                                      -82-

all at the times  (and in any case  prior to the  expiration  of any  applicable
grace periods) and places and in the manner set forth therein.

          SECTION 7.11. Compliance With Laws. The Loan Parties shall comply with
     all applicable Legal Requirements, including, without limitation, all Legal
     Requirements  relating to the  operation of commercial  office  properties,
     except where (i) the failure so to comply could not  reasonably be expected
     to have a Material  Adverse  Effect or (ii) the validity of such law, rule,
     regulation  or  ordinance  is being  diligently  contested in good faith by
     appropriate  proceedings and adequate reserves in conformity with GAAP have
     been provided therefor on the books of the Loan Parties.

          SECTION 7.12.  Environmental  Compliance.  (a) The Loan Parties shall,
     and shall cause each of their  Subsidiaries to, keep all Properties and all
     other  property  owned or  operated  by them  free of  Hazardous  Materials
     (except  customary  materials in the usual  amounts used and/or  stored for
     usage,  used in the normal  operations of a Class A office  property and in
     compliance  with Legal  Requirements)  and comply with Legal  Requirements,
     except  where the  failure  to do any of the  foregoing  is not  reasonably
     expected to have a Material Adverse Effect.

                  (b)  Except  to the  extent  it does so on the date  hereof in
strict  compliance with all applicable  Legal  Requirements and in a manner that
does not cause a Release or threat of Release of  Hazardous  Materials,  each of
the Loan Parties shall,  and shall cause each of their  Subsidiaries to, not use
any  Property,  and shall  not  suffer or  permit  the use of any  Property,  to
generate,  manufacture,  refine,  transport,  treat, store, handle,  dispose of,
transfer,  or  produce  Hazardous  Materials,  and shall not cause or  knowingly
permit,  as a result of any act or omission  on the part of the Loan  Parties or
any occupant,  tenant, subtenant or invitee or licensee, the installation,  use,
storage,  release, disposal or handling of Hazardous Materials onto any Property
or suffer the  installation,  use,  storage,  release,  disposal  or handling of
Hazardous Materials on any Property,  except, in each case, as used properly and
in a  manner  as is  customary  in the  normal  operation  of a Class  A  office
property.  The Loan Parties shall  undertake  promptly and pursue  diligently to
completion  appropriate  action  reasonably  necessary to address any Release of
Hazardous  Materials on, upon,  from or into any real property owned or operated
by them, from any real property adjacent to any of the foregoing.

                  (c)  The  Loan   Parties   agree  to   provide   the
Administrative  Agent with copies of any written  notifications  of any material
Releases of Hazardous Materials at any Property that any Authorized Officer of a
Loan  Party or any of its  Subsidiaries  either  gives to or  receives  from any
Governmental  Authority or tenant or, if any Authorized  Officer of a Loan Party
or any of its Subsidiaries has actual notice thereof, that any owner, manager or
receiver of a Property either gives or receives.


                                      -83-

                  (d) The Loan Parties hereby jointly and severally agree
to, and shall cause each of their  Subsidiaries  to, defend,  indemnify and hold
harmless the  Administrative  Agent, the Syndication  Agent,  the  Documentation
Agent, the Lenders and their Assignees and each of their successors and assigns,
and the employees, agents, officers and directors of each of the foregoing, from
and against any and all claims, demands,  judgments,  fines, penalties (civil or
criminal),   damages,   actions,  causes  of  action,   injuries,   settlements,
administrative  orders,  consent  agreements and orders,  liabilities,  economic
loss,  costs and expenses of whatever kind or nature whether imposed or incurred
within or outside  judicial  process  (including,  without  limitation,  cleanup
costs,  reasonable  consultants' fees and disbursements and  investigations  and
laboratory  fees and attorneys'  fees) related to or arising at any time or from
time to time  directly  or  indirectly  from,  out of or by reason of any of the
following:

                  (i)  the  presence,   disposal,   escape,  seepage,   leakage,
         spillage,  discharge,  emission,  release  or threat of  release of any
         Hazardous  Materials  at,  over,  on,  under or from or  affecting  any
         Property, regardless of its origin;

                  (ii)  compliance  with any Legal  Requirement  with respect to
         Hazardous  Materials  governing  the Loan  Parties,  their  businesses,
         operations,  property,  assets  or  equipment,  or  resulting  from the
         exercise by the  Administrative  Agent or any Lender of any right under
         the Facility Documents;

                  (iii) any  personal  injury  (including,  without  limitation,
         wrongful death,  disease or other health condition related to or caused
         by, in whole or in part,  any Hazardous  Materials) or property  damage
         (real or personal) arising out of or related to any Hazardous Materials
         of whatever origin in, on, over,  under, from or affecting any Property
         or any part  thereof  whether  or not  disclosed  by any  environmental
         report relative to such Property;

                  (iv) any action,  suit or proceeding  brought or threatened by
         or settlement reached with any Governmental  Authority or other Person,
         or order  of any  Governmental  Authority  relating  to such  Hazardous
         Material (whether or not disclosed by any environmental report relative
         to any Property);


                                      -84-

                  (v)   any    violation   of   the    provisions,    covenants,
         representations  or  warranties of SECTION 5.9, 5.21 AND/OR 7.12 hereof
         or of any Legal  Requirement which is based on or in any way related to
         any  Hazardous  Materials  in, on, over,  under,  from or affecting any
         Property or any part thereof including, without limitation, the cost of
         any work performed and materials furnished in order to comply therewith
         (whether or not disclosed by any environmental  report relative to such
         Property) or to enforce the provisions of this SECTION 7.12, including,
         without limitation, the cost of assessment, containment and/or removal,
         to the extent required by applicable Legal Requirements, of any and all
         Hazardous  Materials or any surrounding areas, the cost of any actions,
         to the extent  required  by  applicable  Legal  Requirements,  taken in
         response to the presence, release or threat of release of any Hazardous
         Materials on, in, under or affecting any portion of any Property or any
         surrounding  areas to prevent  or  minimize  such  release or threat of
         release so that it does not  migrate  or  otherwise  cause or  threaten
         danger to  present  or future  public  health,  safety,  welfare or the
         environment,  and  costs  incurred  to  comply  with  applicable  Legal
         Requirements  in connection  with all or any portion of any Property or
         any surrounding areas; and/or

                  (vi) any act or  omission  of the  Loan  Parties,  any  owner,
         operator,  manager or receiver of a Property, its officers,  employees,
         agents, contractors,  invitees,  licensees, or permitees giving rise to
         liability  under any  Legal  Requirements  with  respect  to  Hazardous
         Materials;

PROVIDED,  HOWEVER,  that the Loan Parties'  obligation to defend,  and to cause
each of its  Subsidiaries  to defend,  under this SECTION 7.12 shall include the
right to assert in good faith any defense  available  under Legal  Requirements,
including  with respect to any exemptions  from  liability  available to lenders
under environmental laws; and, PROVIDED, FURTHER, that indemnification shall not
apply with  respect to any  Person to any  matter to the extent  such  matter is
determined  to have been caused by such  Person's  gross  negligence  or willful
misconduct.

                  (e) The  obligations  and  indebtedness  of the  Loan
Parties under SECTION 7.12(D) hereof,  notwithstanding anything contained herein
or in any other  document or agreement  which may be construed to the  contrary,
shall survive the repayment of the Loans and the termination and/or discharge of
the Notes and other Facility Documents.


                                      -85-

                  (f) If,   in  the   reasonable   judgment   of  the
Administrative  Agent based upon  governmental  notice or a third  party  claim,
there are grounds to suspect  that a  reportable  material  Release of Hazardous
Materials  has  occurred or is  occurring,  the  Administrative  Agent is hereby
specifically  authorized  at its  sole  election,  at the  expense  of the  Loan
Parties, upon five (5) days' prior written notice to the Borrowers, on behalf of
the Loan  Parties  (except  in the case of an  emergency),  to cause one or more
environmental  assessments  of  the  Release  to  be  undertaken.  Environmental
assessments may include a detailed visual  inspection of the Properties,  or any
of them,  including,  without  limitation,  all storage  areas,  storage  tanks,
drains,  dry wells and leaching  areas,  as well as the taking of soil  samples,
surface water samples and ground water samples,  and such other investigation or
analysis  as  is  necessary  or  appropriate   for  an  assessment  of  Release.
Notwithstanding the foregoing,  the Administrative Agent, in its sole discretion
and from time to time (but not more often than once in any two-year period),  at
the sole expense of the Loan Parties, may cause an environmental site assessment
(a "Phase I Assessment") of any or all of the Properties to determine (i) if any
Hazardous  Materials  exist on the Properties  (including  groundwater on, in or
under a Property) and (ii) if any  condition,  use or operation  exists at or on
any  Property  about  which  a  Governmental   Authority   would,   under  Legal
Requirements,  require  corrective  action.  The  Phase I  Assessment  shall  be
conducted  by a  qualified  environmental  consultant  and may  include,  in the
reasonable  discretion of the  Administrative  Agent, a visual inspection of the
Properties, examination of public records, research of the Loan Parties' records
pertaining  to the  Properties  and  sampling of  suspected  asbestos-containing
building materials and lead-based paint.

                  (g) Any sums expended or incurred by the Administrative
Agent to cure any breach or default by the Loan Parties under the  provisions of
this  SECTION 7.12 shall be due and payable  within 10 days after  receipt of an
invoice therefor  (accompanied by customary  supporting  material) with interest
thereon at the Default Rate.

          SECTION 7.13. Further  Assurances.  Upon the reasonable request of the
     Administrative Agent, the Syndication Agent, the Documentation Agent or the
     Required Lenders,  the Loan Parties, at their cost and expense,  shall, and
     shall cause each of their  Subsidiaries  to, duly execute and  deliver,  or
     cause  to be duly  executed  and  delivered,  to the  Administrative  Agent
     (without cost to the  Administrative  Agent,  the  Syndication  Agent,  the
     Documentation  Agent or the Lenders)  such further  instruments  and do and
     cause to be done such further acts as may be reasonably necessary or proper
     in the opinion of the  Administrative  Agent,  the Syndication  Agent,  the
     Documentation  Agent or such  Lenders  to carry  out more  effectually  the
     provisions and purposes of this Agreement and the other Facility Documents.

          SECTION 7.14.  Impositions and Discharge of Liens.  (a) General Liens.
     Each  Loan  Party  shall,  and shall  cause  each of its  Subsidiaries  to,
     promptly, at its own cost and expense, take such action as may be necessary
     duly to discharge, by bonding or otherwise, any Lien on any Property to the
     extent not permitted under SECTION 8.1 hereof.

                  (b) Impositions.  (i) Payment of Impositions. The Loan Parties
shall  pay,  or cause to be  paid,  before  any  penalty,  interest  or cost for
nonpayment thereof may be added thereto,  all taxes,  assessments,  vault, water
and sewer rents, rates, charges and assessments,  levies, inspection and license
fees and other governmental and quasi-governmental charges, general and special,
ordinary  and   extraordinary   (collectively,   "Impositions"),   foreseen  and
unforeseen,  heretofore  or  hereafter  assessed,  levied or  otherwise  imposed
against or upon, or which may become a Lien upon, all or any part of a Property,
the revenues, rents, issues, income and profits of all or any part of a Property
or arising in respect of the occupancy,  use or possession thereof if failure to
pay could have a Material  Adverse  Effect.  The Loan  Parties will also pay, or
cause  to be  paid,  any  penalty,  interest  or cost  for  non-payment  of such
Impositions  which may become due and payable,  and such penalties,  interest or
cost  shall be  included  within the term  Impositions.  The Loan  Parties  will
furnish  to the  Administrative  Agent upon the  request  of the  Administrative
Agent, proof of payment at the time same is made, and thereafter,  upon receipt,
validated receipts showing payment in full of all such Impositions.


                                      -86-

                  (ii) Right To Contest.  (A)  Notwithstanding the provisions of
SECTION  7.14(B)(I) hereof, the Loan Parties shall have the right, at their sole
expense,  to contest by appropriate  legal proceedings  diligently  conducted in
good faith, without cost or expense to the Lenders or the Administrative  Agent,
the Syndication  Agent, the  Documentation  Agent or any of its or their agents,
employees,  officers or directors,  the validity,  amount or  application of any
Imposition  on or in respect of any Property  other than any Property on which a
Borrower  or any of its  Subsidiaries  has granted a Lien or Liens to or for the
benefit  of the  Lenders  to secure  repayment  of any part of the  Obligations;
PROVIDED,  HOWEVER, that the prosecution of any such contest would not be likely
to result in a Material Adverse Effect.

                  (B)  Notwithstanding  the  provisions  of  SECTION  7.14(B)(I)
hereof, the Loan Parties shall have the right, at their sole expense, to contest
by appropriate legal  proceedings  diligently  conducted in good faith,  without
cost or expense to the  Lenders or the  Administrative  Agent,  the  Syndication
Agent,  the  Documentation  Agent  or any of its  or  their  agents,  employees,
officers or directors, the validity,  amount or application of any Imposition on
or in respect of any Property on which a Borrower or any of its Subsidiaries has
granted a Lien or Liens to or for the benefit of the Lenders to secure repayment
of any part of the Obligations; PROVIDED, HOWEVER, that:

     (1) NO DEFAULT OR EVENT OF DEFAULT  SHALL HAVE  OCCURRED AND BE  CONTINUING
     DURING SUCH  PROCEEDINGS AND THE FAILURE TO PAY SUCH  IMPOSITION  SHALL NOT
     OTHERWISE VIOLATE THE TERMS OF THE FACILITY DOCUMENTS;

     (2) SUCH  CONTEST  AND/OR THE FAILURE TO PAY SUCH  IMPOSITION  WILL NOT (I)
     SUBJECT THE LENDERS,  THE ADMINISTRATIVE  AGENT, THE SYNDICATION AGENT, THE
     DOCUMENTATION AGENT OR ANY OF ITS OR THEIR AGENTS,  EMPLOYEES,  OFFICERS OR
     DIRECTORS,  TO ANY CRIMINAL OR MATERIAL CIVIL  LIABILITY OR (II) MATERIALLY
     ADVERSELY  AFFECT THE OWNERSHIP,  USE OR OCCUPANCY OF ANY PROPERTY OR (III)
     ADVERSELY  AFFECT  THE  PRIORITY  OF ANY  LIEN  SECURING  THE  LOANS OR ANY
     GUARANTY THEREOF;

                                      -87-


     (3) SUCH CONTEST SUSPENDS ENFORCEMENT OF THE IMPOSITION AND SUCH CONTEST IS
     MAINTAINED AND PROSECUTED  DILIGENTLY;  

     (4) THE  APPLICABLE  PROPERTY OR ANY PART THEREOF OR ANY  INTEREST  THEREIN
     WILL NOT BE IN ANY  IMMINENT  DANGER OF BEING  SOLD,  FORFEITED  OR LOST BY
     REASON OF SUCH CONTEST;

     (5) THE LOAN PARTIES SHALL  APPRISE THE  ADMINISTRATIVE  AGENT FULLY,  UPON
     REQUEST BY THE  ADMINISTRATIVE  AGENT, FROM TIME TO TIME, BY WRITTEN NOTICE
     OF THE  STATUS  OF  SUCH  CONTEST  AND/OR  CONFIRMATION  OF THE  CONTINUING
     SATISFACTION OF THE FOREGOING CLAUSES OF THIS Section 7.14(b)(ii)(B); AND

     (6) UPON A FINAL  DETERMINATION  OF SUCH  CONTEST,  THE LOAN PARTIES  SHALL
     PROMPTLY COMPLY WITH THE REQUIREMENTS THEREOF.

Upon completion of any contest, the Loan Parties shall immediately pay, or cause
to be paid,  the amount due, if any,  and  deliver to the  Administrative  Agent
proof of the completion of the contest and payment of the amount due, if any.

                  SECTION 7.15.  Leases and Rents. (a) The Loan Parties will (i)
perform or cause to be performed the lessor's obligations under any Lease now or
hereafter  affecting  the whole or any part of any Property,  (ii)  enforce,  or
cause to be enforced,  the performance by each lessee under its respective Lease
of all of said  lessee's  obligations  thereunder  and (iii) hold or cause to be
held all tenant security deposits in a separate account to be used only for such
purpose in accordance  with all  applicable  Legal  Requirements,  in each case,
unless  failure  to do so would not be likely  to result in a  Material  Adverse
Effect.

                  (b) The Loan Parties may not (i) assign,  mortgage,  pledge or
otherwise  transfer,  dispose of or  encumber,  whether by  operation  of law or
otherwise,  any Lease of a Property or the Rents or other income  thereunder  or
therefrom  except as permitted under SECTION 8.1 hereof or (ii) accept or permit
the  acceptance  of a prepayment of any rents for more than one month in advance
of the due  dates  therefor,  PROVIDED,  HOWEVER,  that,  so long as no Event of
Default  shall have occurred and be  continuing,  the Loan Parties may accept or
permit the acceptance of a prepayment of rents of up to six months in advance of
the due dates therefor so long as (x) the aggregate amount of such prepaid rents
of up to six months in advance of the due dates  therefor of all tenants  during
any fiscal year of the  Borrowers  is not greater than  $2,500,000,  and (y) any
such prepayment shall apply to the then-current period of the prepaying tenant's
occupancy.

                                      -88-


                  SECTION 7.16. Excess Cash Flow. Cornerstone LP shall cause the
transfer  of  all  "Excess  Cash  Flow"  (as  defined  below)  of  each  of  its
Wholly-Owned  Subsidiaries,  and its applicable share of such "Excess Cash Flow"
of each of its other  Subsidiaries  (to the extent  that  Cornerstone  LP or its
Subsidiaries can cause such transfer in accordance with the governing  documents
of such other Subsidiaries), to Cornerstone LP as promptly as possible but in no
event  less  often  than once a month.  "Excess  Cash  Flow"  for any  period of
determination  shall mean an amount equal to all NOI of such Subsidiary for such
period minus all debt service  payments of such  Subsidiary  made in such period
minus normal and customary Capital  Expenditures  incurred by such Subsidiary in
such period.

                  SECTION 7.17.  Acquisition  of  Properties.  The Borrowers and
  their  Subsidiaries  shall  acquire,  or shall invest in joint  ventures which
  shall acquire,  only Class A office properties in major  metropolitan  central
  business districts and major suburban markets of the United States;  PROVIDED,
  HOWEVER,  that the Borrowers and their  Subsidiaries shall not acquire any New
  Property which is an Unencumbered  Property and which the Borrowers  intend to
  use in their calculations for the covenants set forth in SECTIONS 8.9 AND 8.10
  hereof, unless and until

         (i) the Borrowers shall have provided to the  Administrative  Agent (A)
         the most recent  rent rolls for each such New  Property,  (B)  one-year
         historical and three-year  projected operating statements for each such
         New Property, (C) cash flow projections for each such New Property, (D)
         Capital Expenditure budgets for each such New Property,  (E) leases and
         lease  summaries  for each such New  Property  (including  any separate
         agreements  regarding  concessions  to or options  from  tenants),  (F)
         tenant financial statements, to the extent available, for each such New
         Property,  (G) an aging of rent payments and rent payment histories for
         each  major  tenant of each such New  Property,  (H) copies of the most
         recent Phase I environmental reports for each such New Property as well
         as copies of all  existing  environmental  reports and audits  (whether
         prepared by a Loan Party or any of its  Subsidiaries  or by independent
         consultants)  pertaining to each such New  Property,  (I) copies of the
         partnership agreement or joint venture agreement, if any, governing the
         entity acquiring each such New Property,  and (J) a physical inspection
         (at the Borrower's expense) of each such New Property, and

         (ii) the  Administrative  Agent shall have determined,  in its sole and
         reasonable  discretion  based on the  financial  analysis  described in
         clause (i) above,  that the  acquisition  of such New  Property  is not
         reasonably likely to cause a Material Adverse Effect.

                                      -89-

                  SECTION 7.18. Additional  Guarantors.  The Borrowers and their
Wholly-Owned  Subsidiaries will cause (i) each of their respective  Wholly-Owned
Subsidiaries  acquired  after  the date  hereof,  and (ii)  each of their  other
Wholly-Owned  Subsidiaries  acquired  after the date  hereof  which  directly or
indirectly owns an interest in a joint venture owning, or formed for the purpose
of owning, title to a Property, to become a Guarantor and to execute and deliver
to the  Administrative  Agent a counterpart of this  Agreement  executed by each
such Subsidiary  together with all other  documents,  agreements and instruments
reasonably  requested by the Administrative Agent to assure each such Subsidiary
assumes all of the obligations of a Guarantor hereunder; PROVIDED, HOWEVER, that
no Subsidiary of either Borrower listed on SCHEDULE 7.18(A) hereto,  as the same
shall be amended  from time to time,  shall be  required  to become a  Guarantor
hereunder until such time as

              (a) (X) it has  material  real  property  assets other than one or
              more  of  the   following   properties   (the   "DIHC   Collateral
              Properties"):

     (1)  the property  identified as "Charlotte Plaza" on pages 70 to 71 of the
          Cornerstone Proxy Statement;

     (2)  the property  identified as "527 Madison  Avenue" on pages 85 to 87 of
          the Cornerstone Proxy Statement;

     (3)  the property  identified as "One Lincoln  Centre" on pages 88 to 89 of
          the Cornerstone Proxy Statement;

     (4)  the property  identified  as "Market  Square" on pages 63 to 65 of the
          Cornerstone Proxy Statement; or

     (5)  the  property  identified  as "200  Galleria" on pages 71 to 73 of the
          Cornerstone Proxy Statement; or

              (Y) it has material real property assets other than one or more of
              the properties  listed on SCHEDULE  7.18(B),  as the same shall be
              amended from time to time (the "WWA Collateral Properties"), which
              properties  as of the Initial  Funding  Date shall be mortgaged to
              secure the WWA Acquisition Debt and which mortgages  prohibit such
              Subsidiary  from  becoming  a  Guarantor  hereunder,   until  such
              restriction  on  guarantees  under the mortgage  securing such WWA
              Acquisition Debt no longer applies to such Subsidiary; or

              (Z) it has material assets other than Capital  Interests in one or
              more  Subsidiaries  or joint  ventures  whose only  material  real
              property assets are one or more of the DIHC Collateral  Properties
              or the WWA Collateral Properties; and

              (b) it is not a  guarantor  or  co-obligor  of payment of the DIHC
              Purchase Money Notes or the WWA Acquisition Debt.

          SECTION  7.19.  Title/Status  of Mortgage  Loans.(a) The Borrowers and
     their  Subsidiaries shall own and hold good title to each Mortgage Note and
     each  Mortgage  Loan free and clear of any Liens.  The  Borrowers and their
     Subsidiaries shall not waive, modify, alter, satisfy, cancel or subordinate
     any Mortgage Note, any of the Mortgages or any Mortgage Loan in any respect
     if the  effect  of such  waiver,  modification,  alteration,  satisfaction,
     cancellation or  subordination  is to cause a default under any covenant of
     this Agreement or any of the other Facility Documents.

                                      -90-


          (b) Each  Mortgage  Note and each  related  Mortgage  acquired  by the
     Borrowers  or their  Subsidiaries  shall be the  legal,  valid and  binding
     obligation of each party  obligated  thereunder,  enforceable  against such
     party in accordance with its terms,  except as the enforcement  thereof may
     be   limited  by   applicable   bankruptcy,   insolvency,   reorganization,
     moratorium,  and similar laws affecting  creditors' rights generally.  Each
     Mortgage  acquired by the  Borrowers or their  Subsidiaries  shall create a
     first  priority Lien on the property which is the subject of such Mortgage.
     Each Mortgage Loan acquired by the Borrowers or their Subsidiaries shall be
     made in compliance with all applicable laws and shall not violate any usury
     or  similar  law  regulating  the  applicable  maximum  permitted  rates of
     interest for loans,  extensions  of credit or  forbearances.  Each Mortgage
     Note  acquired by the  Borrowers or their  Subsidiaries  shall be free from
     material adverse claims, setoffs, defaults, defenses, retainages, holdbacks
     and conditions precedent of any kind or character.

         SECTION  7.20.  YEAR 2000.  THE  BORROWERS  SHALL USE THEIR  REASONABLE
EFFORTS TO ENSURE THAT THE FOLLOWING ARE YEAR 2000 COMPLIANT IN A TIMELY MANNER,
BUT IN NO EVENT LATER THAN DECEMBER 31, 1999: (A) THE BORROWERS THEMSELVES;  AND
(B) EACH  SUBSIDIARY.  THE BORROWERS SHALL FURTHER MAKE REASONABLE  INQUIRIES OF
AND  REASONABLE  EFFORTS TO ENSURE THAT EACH OF THE FOLLOWING ARE SIMILARLY YEAR
2000  COMPLIANT:  (X) EACH PROPERTY,  (Y) ALL MAJOR TENANTS,  INCLUDING  WITHOUT
LIMITATION EACH LESSEE AND EACH PROPERTY MANAGER; AND (Z) ALL MAJOR CONTRACTORS,
SUPPLIERS,   SERVICE   PROVIDERS   AND  VENDORS  OF  THE   BORROWERS  AND  THEIR
SUBSIDIARIES.  AS USED IN THIS PARAGRAPH, "MAJOR" SHALL MEAN PROPERTIES,  ASSETS
OR ENTITIES THE FAILURE OF WHICH TO BE YEAR 2000 COMPLIANT WOULD HAVE A MATERIAL
ADVERSE  EFFECT.  THE TERM "YEAR 2000  COMPLIANT"  SHALL MEAN,  IN REGARD TO ANY
PROPERTY OR ENTITY,  THAT ALL SOFTWARE,  HARDWARE,  EQUIPMENT,  GOODS OR SYSTEMS
UTILIZED BY OR MATERIAL TO THE  PHYSICAL  OPERATIONS,  BUSINESS  OPERATIONS,  OR
FINANCIAL  REPORTING  OF  SUCH  PROPERTY,  ASSET  OR  ENTITY  (COLLECTIVELY  THE
"SYSTEMS") WILL PROPERLY  PERFORM DATE SENSITIVE  FUNCTIONS  BEFORE,  DURING AND
AFTER THE YEAR 2000.  THE BORROWERS  SHALL,  WITHIN THIRTY  BUSINESS DAYS OF THE
ADMINISTRATIVE AGENT'S WRITTEN REQUEST, PROVIDE TO THE ADMINISTRATIVE AGENT SUCH
CERTIFICATIONS OR OTHER EVIDENCE OF THE BORROWERS'  COMPLIANCE WITH THE TERMS OF
THIS  PARAGRAPH  AS THE  ADMINISTRATIVE  AGENT MAY FROM TiME TO TIME  REASONABLY
REQUIRE.


                                      -91-


                                  ARTICLE VIII
                               NEGATIVE COVENANTS

                  The Loan  Parties  jointly and  severally  covenant  and agree
that,  until the Commitments  have been terminated and the Notes,  together with
interest and all other  Indebtedness  of the Loan Parties to the  Administrative
Agent or the Lenders under this Agreement and the other Facility Documents,  are
paid in full, no Loan Party,  without the prior written  consent of the Required
Lenders  (or,  in the case of SECTIONS  8.9 AND 8.10  hereof,  all the  Lenders)
except as otherwise expressly permitted elsewhere herein,  shall do or suffer to
occur or exist any of the following:

                  SECTION 8.1. Liens. Create, assume or suffer to exist any Lien
upon any of its  properties  and  other  assets  or  those of its  Subsidiaries,
whether now owned or hereafter acquired;  PROVIDED,  HOWEVER, that the foregoing
restriction and limitation shall not apply to the following Liens :

                  (a) Permitted Encumbrances;

                  (b) other  Liens  (including  pledges or  deposits  in
         accordance with workers' compensation laws),  incidental to the conduct
         of its business or the  ownership of its property and assets,  that are
         not incurred in connection with the borrowing of money or the obtaining
         of advances or credit,  and that do not in the aggregate,  with respect
         to the Loan Parties taken as a whole, materially detract from the value
         of their  property or assets,  or materially  impair the use thereof in
         the operation of their business;

                  (c) attachment,  judgment  and  other  similar  Liens
         arising in  connection  with  judicial or  administrative  proceedings,
         PROVIDED,  HOWEVER,  that either (i) execution or other  enforcement of
         such Liens is effectively stayed or (ii) the claims secured thereby are
         being  contested  diligently in good faith by appropriate  proceedings,
         adequate  reserves in  conformity  with GAAP have been  provided on the
         books of the Loan Parties, and no levy of execution or other comparable
         proceeding has been issued thereon and a Loan Party would not otherwise
         be subject to a forfeiture,  or (iii) the  liabilities  secured by such
         Liens do not exceed $500,000 in the aggregate;

                  (d) Liens  securing the repayment of  Indebtedness  for
         which  no   properties   or  assets  of  the  Loan  Parties  and  their
         Subsidiaries,  other  than the  properties  or assets  subject  to such
         Liens, are subject to recourse for payment of such secured Indebtedness
         (other than for  reasonable  and customary  exceptions to  non-recourse
         protection);

                  (e) Liens created under the Facility Documents or other
         Liens in favor  of the  Administrative  Agent  for the  benefit  of the
         Lenders;

                                      -92-


                  (f) Liens  securing  Indebtedness  of the Loan Parties
         under the DIHC  Purchase  Money Notes and any  guarantees of any of the
         Loan Parties thereof;

                  (g) Liens  securing  the  repayment  of  Indebtedness
         incurred in connection with the purchase or lease of computers,  office
         and telecommunications  equipment,  and other personal property used in
         the ordinary course of business; and

                  (h) Liens  in  existence  on  the  date  hereof  and
identified on SCHEDULE 5.7 hereto.

                  SECTION 8.2.  Limitation  on  Investments.  Make, or commit to
make,  any  Restricted  Investment,  other than (i)  Restricted  Investments  in
Subsidiaries and Unconsolidated Affiliates formed for the purpose of acquiring a
Property or (ii) an acquisition by purchase or otherwise of all or substantially
all the stock or other  evidence of  beneficial  ownership of any Person for the
purpose of acquiring one or more Properties or as otherwise  permitted  pursuant
to SECTION 8.13 hereof.

                  SECTION 8.3. Restricted  Payments;  Dividend Payout.  Make, or
obligate  itself to make,  any  Restricted  Payment,  except for (i) payments in
respect of Indebtedness and refinancings  thereof not prohibited by SECTION 8.11
hereof,  (ii)  Dividends  to  holders  of  Cornerstone  Preferred  Stock,  (iii)
Dividends  to  holders  of  Cornerstone  Common  Stock,  but only to the  extent
provided for in SECTION 8.20 hereof,  (iv)  distributions  to holders of limited
partnership  units in Cornerstone  LP, and (v) Dividends or  distributions  to a
Borrower  by any of its  Subsidiaries;  PROVIDED,  HOWEVER,  that if an Event of
Default  shall have  occurred  and be  continuing,  each  Borrower  may make the
Restricted  Payments described in clauses (ii), (iii) and (iv) above only to the
extent  necessary  for such  Borrower to maintain its status as a REIT under the
Code.

                  SECTION 8.4.  Working Capital.  Permit Working Capital at any 
time to be less than $10,000,000.

                  SECTION 8.5. Equity Value.  Permit Equity Value at any time to
be less than an amount equal to (i) eighty per cent (80%) of the Equity Value as
of the  Initial  Funding  Date plus (ii)  eighty  per cent  (80%) of all  Equity
Proceeds  received  by  the  Loan  Parties  and  their  respective  Subsidiaries
subsequent to the Execution Date.

                  SECTION 8.6.  Leverage Ratio.  Permit Consolidated Total 
Liabilities as at the end of any fiscal quarter to exceed fifty-five per cent 
(55%) of Total Property Asset Value as at the end of such fiscal quarter.

                  SECTION  8.7.  Interest  Coverage  Ratio.  Permit the ratio of
Adjusted  EBITDA to Interest  Expense for any quarterly  period ending as of the
last day of any calendar quarter to be less than (i) at all times from and after
the Execution Date to and including June 30, 1999, 2.00 to 1.00, and (ii) at all
times after June 30, 1999, 2.25 to 1.00.

                                      -93-


                  SECTION 8.8. Fixed Charge Coverage Ratio.  Permit the ratio of
Adjusted EBITDA to Consolidated Fixed Charges for any quarterly period ending as
of the last day of any calendar quarter to be less than 1.75 to 1.00.

                  SECTION 8.9.  Unencumbered Properties Asset Value.  Subject to
the proviso set forth in SECTION 7.17 hereof, permit the Unencumbered Properties
Asset Value at any time to be less than $600,000,000.

                  SECTION 8.10.  Additional Financial Covenants.  (i) Subject to
the proviso set forth in SECTION  7.17  hereof,  permit at any time the ratio of
(X) the  Unencumbered  Properties  Asset  Value  to (Y) an  amount  equal to the
aggregate  unsecured  Indebtedness  of the  Loan  Parties  (including  the  Loan
Parties' Ratable Share of Indebtedness of Unconsolidated Affiliates), to be less
than 2.00 to 1.00.

                  (ii) Permit at any time the ratio of (X) Total  Property Asset
Value to (Y) an amount equal to the sum of, without  duplication,  (1) aggregate
secured  Indebtedness of the Loan Parties  (including the Loan Parties'  Ratable
Share  of  Indebtedness  of  Unconsolidated  Affiliates)  permitted  under  this
Agreement  plus (2) the  amount by which the  aggregate  unsecured  Indebtedness
(excluding   intercompany   Indebtedness   that  would  be   eliminated  in  the
consolidated  financial  statements of the Borrowers) of all Subsidiaries of the
Borrowers  (other than,  in the case of  Cornerstone  LP,  Cornerstone)  exceeds
$10,000,000, to be less than 2.50 to 1.00.

                  (iii) Subject to the proviso set forth in SECTION 7.17 hereof,
permit at any time the ratio of (X) Combined  Adjusted  NOI of all  Unencumbered
Properties to (Y) Unsecured Interest Expense to be less than 2.25 to 1.00.

                  (iv)  Permit  at any  time  the  ratio  of (X)  the sum of (1)
aggregate  budgeted project costs for all Construction in Process (including the
Loan Parties' Ratable Share of such costs budgeted by Unconsolidated Affiliates)
plus (2) the  aggregate  Undepreciated  Cost  Basis of all  Properties  acquired
pursuant  to  forward  purchase  agreements  in  existence  as of  the  date  of
determination,  plus (3) the book value,  determined in accordance with GAAP, of
the aggregate  ownership  interests of the Borrowers and their  Subsidiaries  in
Land to (Y) Total Property Asset Value to be greater than 0.15 to 1.00.

                  (v)  Permit at any time the ratio of (X)  aggregate  ownership
interests  of the  Borrowers  and their  Subsidiaries  in  Mortgages  (valued in
accordance with GAAP), to (Y) Total Property Asset Value to be greater than 0.05
to 1.00.

                                      -94-


                  (vi) Permit at any time the ratio of (X)  aggregate  ownership
interests of the Borrowers and their  Subsidiaries  in Properties  which are not
Class A office properties in major  metropolitan  central business districts and
major  suburban  markets of the United  States  (valued in  accordance  with the
definition of Total Property Asset Value),  to (Y) Total Property Asset Value to
be greater than 0.05 to 1.00.

                  SECTION 8.11. Indebtedness. (i) Incur Indebtedness the payment
of  which  is  secured  by  Liens  on any of the  Properties  or any of the Loan
Parties' other assets,  whether now owned or hereafter acquired, or those of any
of the  Loan  Parties'  Subsidiaries;  PROVIDED,  HOWEVER,  that  the  foregoing
restriction  and  limitation  shall  not apply to (a)  Indebtedness  of the Loan
Parties  under the DIHC  Purchase  Money  Notes and any  guarantees  of the Loan
Parties thereof, (b) Indebtedness secured by Liens permitted pursuant to SECTION
8.1 hereof,  and (c)  Indebtedness for which no properties or assets of the Loan
Parties and their  Subsidiaries,  other than the properties or assets subject to
such Liens,  are subject to recourse  for payment of such  secured  Indebtedness
(other than for reasonable and customary exceptions to non-recourse  protection)
and  refinancings  of such  Indebtedness  on terms then  customary  for  similar
transactions or on terms not materially less favorable to the Loan Parties.

                  (ii)  Cause or  permit  any of the  Loan  Parties'  direct  or
indirect  Subsidiaries that is not a Guarantor to incur any Indebtedness,  other
than (a)  Indebtedness  for which no  properties  or assets of such  Subsidiary,
other than the  properties or assets  subject to Liens securing the repayment of
such  Indebtedness,  are  subject to recourse  for payment of such  Indebtedness
(other than for reasonable and customary exceptions to non-recourse protection),
and (b)  other  Indebtedness  in an  aggregate  principal  amount  for all  such
Subsidiaries not to exceed $5,000,000.

                  SECTION  8.12.  Asset  Sales  and  Transfers.   (i)  Sell  any
Properties,  or all of the Capital  Interests  of any  Subsidiary  that owns any
Property  or owns  Capital  Interests  in another  Person  that owns a Property,
unless prior to consummation of such sale, the Borrowers shall have delivered to
the   Administrative   Agent  an  Officer's   Certificate   certifying   to  the
Administrative  Agent and the Lenders that  immediately  before and after giving
effect to such sale,  no Default or Event of Default  shall have occurred and be
continuing or would result therefrom, with such certificate to be accompanied by
a schedule  setting  forth the  computations  before and, on a pro forma  basis,
after  giving  effect  to such  sale of each of the  financial  ratios  or tests
specified in SECTION 8.5 THROuGH 8.10 hereof.

                  (ii)  Subject  to  SECTION  8.13  hereof,  sell  or  otherwise
transfer  any Capital  Interest in a Guarantor to a Person other than a Borrower
or another  Guarantor,  except to the extent the Property or Properties owned by
such  Guarantor  could be  transferred  in  accordance  with  CLAUSE (I) of this
Section.

                                      -95-


                  (iii) Subject to SECTION 7.2(K) hereof,  sell any other assets
other than in the ordinary course of business or as such assets become obsolete,
damaged, or useless in the business of the Loan Parties.

                  SECTION 8.13.  Certain  Capital  Transactions  and Fundamental
Changes. Consolidate with or merge into any other Person (other than a merger of
(a) a Subsidiary into a Borrower or (b) a Subsidiary  into another  Subsidiary),
or  sell,  convey,  assign,  transfer,  lease  or  otherwise  dispose  of all or
substantially all of the business, property or fixed assets of the Borrowers and
their  Subsidiaries  taken  as a whole  to any  other  Person,  or  directly  or
indirectly  acquire  by  purchase  or  otherwise  all or  substantially  all the
business, property, or fixed assets of, or stock or other evidence of beneficial
ownership of, any Person, unless:

                  (i)  either  (X) a  Borrower  or a  Subsidiary  shall  be  the
         continuing  Person or (Y) the Person  formed by such  consolidation  or
         into  which a Borrower  or a  Subsidiary  is merged,  or the Person who
         acquires  all  or  substantially  all of  property  and  assets  of the
         Borrowers and their  Subsidiaries  taken as a whole,  expressly assumes
         pursuant  to   documentation   and  agreements   satisfactory   to  the
         Administrative  Agent and the  Required  Lenders  the due and  punctual
         payment  of  the  principal  of  and  interest  on the  Loans  and  the
         performance  of all of the covenants and  obligations of the applicable
         Loan Party under the Facility Documents;

                  (ii)  immediately  before  and  after  giving  effect  to such
         merger,  sale,  conveyance,  lease,  or  transfer  on a pro forma basis
         (including,   without   limitation,   any   Indebtedness   incurred  or
         anticipated  to be  incurred in  connection  with or in respect of such
         merger, sale, conveyance,  lease, or transfer),  no Default or Event of
         Default   shall  have  occurred  and  be  continuing  or  would  result
         therefrom;

                  (iii)  the   business  of  (X)  the  Person   formed  by  such
         consolidation  or into which a Borrower or a Subsidiary  is merged,  or
         (Y) the Person who  acquires all or  substantially  all of the property
         and assets of the Borrowers and their Subsidiaries taken as a whole, or
         (Z) the Person of which a Borrower  or a  Subsidiary  has  acquired  by
         purchase or otherwise all or substantially all the business,  property,
         or fixed assets of, or stock or other evidence of beneficial ownership,
         is the ownership and  management of Class A office  properties in major
         metropolitan  central business  districts and major suburban markets of
         the United  States,  and all of its real  properties are Class A office
         properties in major  metropolitan  central business districts and major
         suburban markets of the United States,  except as permitted pursuant to
         SECTION 8.10(VI) hereof;

                  (iv)  Persons who are  directors  of  Cornerstone  immediately
         before such merger, sale,  conveyance,  lease, or transfer shall, after
         giving  effect to such merger,  sale,  conveyance,  lease,  or transfer
         (other than the transactions contemplated by the WWA Merger Agreement),
         constitute  at least 90% of the board of directors  of (X)  Cornerstone
         (if the continuing  corporation) or (Y) the corporation  formed by such
         consolidation  or into which  Cornerstone is merged,  or (Z) the Person
         who  acquires  all or  substantially  all of the property and assets of
         Borrowers and their Subsidiaries taken as a whole; and

                                      -96-


                  (v) In the  case  in  which  the  Borrowers  will  acquire  by
         purchase or otherwise all or substantially all the business,  property,
         or fixed assets of, or stock or other evidence of beneficial  ownership
         of another Person (the "Acquired Person"), no persons who are directors
         of Cornerstone  immediately  before such acquisition are also directors
         of the Acquired Person.

                  SECTION 8.14.  Certain  Amendments.  Consent to any amendment,
supplement,  or other  modification  of, or by acts or  omissions,  permit to or
suffer  to  be  waived,   modified  or  amended  any  of  the  terms  (including
acceleration,   covenant,  default,  subordination,   sinking  fund,  repayment,
interest rate or redemption  provisions)  contained in, or applicable to, or any
security for, any Subordinated Debt or other instrument evidencing or applicable
to any Subordinated Debt, to the extent such action is materially adverse to the
interests of the Loan Parties or the Lenders.

                  SECTION 8.15.  Transactions  with  Affiliates.  Enter into, or
cause,  suffer,  or  permit  to  exist,  any  transactions  including,   without
limitation,  the  purchase,  sale,  lease or  exchange  of any  property  or the
rendering  of any  service,  with  any  Affiliate  (other  than  reasonable  and
customary  fees paid to members of the board of directors  of the Loan  Parties)
(i)  on a  basis  materially  less  favorable  to  the  Loan  Parties  or  their
Subsidiaries,  as the case may be,  than could be  obtained  on an arm's  length
basis from a Person other than an Affiliate,  and (ii) that,  individually or in
the aggregate, could reasonably be expected to have a Material Adverse Effect.

                  SECTION 8.16.  Management  Agreements.  Directly or indirectly
enter into any management  agreement or similar agreement  delegating to another
Person substantial  authority over the leasing,  maintenance or operation of any
Property  on a basis  materially  less  favorable  to the Loan  Parties or their
Subsidiaries,  as the case may be,  than could be  obtained  on an arm's  length
basis.

                  SECTION  8.17.   Inconsistent   Agreements.   Enter  into  any
agreement  containing any  provisions  that would be violated or breached by the
borrowing  of the  Loans or  other  extensions  of  credit  hereunder  or by the
performance  by any Loan  Party of its  obligations  under  any of the  Facility
Documents.

                                      -97-


                  SECTION 8.18.  Maintenance of Corporate Existence.

          (a)(i) At any time be engaged, directly or indirectly, in any business
     other than the ownership, management and operation of Properties; or

          (ii)   Except as  permitted by SECTION 8.13 hereof,  fail to cause
     to be done all things  necessary  to preserve the  corporate,  partnership,
     limited liability company, or trust existence of the Loan Parties; or

          (iii)  Fail  to  maintain   adequate   capital  for  the  normal
     obligations  reasonably foreseeable in a business of its size and character
     and in light of its contemplated business operations.

          (b) Anything to the contrary  provided in this SECTION 8.18 or SECTION
     7.3 hereof  notwithstanding,  the Borrowers shall have the right to wind up
     the  affairs  and  dissolve  in  compliance   with  all  applicable   Legal
     Requirements  any  Subsidiary  following the sale or other transfer by such
     Subsidiary in accordance  with the terms of this  Agreement of any Property
     owned by such Subsidiary or joint venture in which such Subsidiary  holds a
     Capital Interest.

                  SECTION 8.19.  Property Mix.  Acquire New Properties  that are
not Class A office properties in major  metropolitan  central business districts
and major suburban markets of the United States,  except to the extent permitted
under CLAUSE (VI) of SECTION 8.10 hereof.

                  SECTION 8.20. REIT Dividend Covenant. Make, or obligate itself
to  make,   Dividends  to  holders  of  Cornerstone  Common  Stock  and  limited
partnership units in Cornerstone LP in an aggregate amount which exceeds,  as of
any date of determination, the greater of (a) the aggregate amount necessary for
Cornerstone to maintain its status as a REIT under the Code, (b) ninety per cent
(90%) of Funds From Operations,  or (c) one hundred ten per cent (110%) of Funds
Available for Distribution, in the case of each of the foregoing clauses (b) and
(c)  calculated  for the  four  immediately  preceding  fiscal  quarters  of the
Borrowers.


                                      -98-



                                   ARTICLE IX
                              DEFAULTS AND REMEDIES

                  SECTION  9.1.  Events  of  Default.  If any one or more of the
following  Events of Default shall occur for any reason  whatsoever (and whether
such  occurrence  shall be voluntary or involuntary or come about or be effected
by operation of law or pursuant to or in compliance with any judgment, decree or
order of any court or any order,  rule or  regulation of any  administrative  or
governmental body), that is to say:

                    (a) if default  shall be made by the Loan Parties in the due
               and punctual  payment of the principal of any of the Loans or the
               Letter of Credit  Obligations;  or  default  shall be made by the
               Loan Parties in the due and  punctual  payment of interest on any
               of the Loans or the  Letter of  Credit  Obligations  or any other
               amounts  due  and  owing  to  the   Administrative   Agent,   the
               Syndication Agent, the Documentation  Agent or the Lenders,  when
               and as the same shall  become due and  payable,  and such default
               shall continue for a period of five (5) days; or

                    (b) (i) if  default(s)  shall  be  made  by any of the  Loan
               Parties  or any of  their  Subsidiaries  in the due and  punctual
               payment of the principal of or interest on any other Indebtedness
               or  any  Contingent  Obligations  of  such  Loan  Party  or  such
               Subsidiaries  in an  aggregate  amount  equal to or in  excess of
               $10,000,000,  and such  default(s)  shall not have been  remedied
               within such grace or cure  period(s),  if any, as may be provided
               therefor; or

                    (ii) if breach or  default  shall be made by any of the Loan
               Parties or any of their  Subsidiaries  or Affiliates with respect
               to any material term of (A) any evidence of any  Indebtedness  or
               any Contingent  Obligation in an aggregate  amount equal to or in
               excess  of  $10,000,000,  or (B) any  loan  agreement,  mortgage,
               indenture or other  agreement  relating to such  Indebtedness  or
               Contingent Obligation, if the effect of such breach or default is
               to cause,  or permit the holder or  holders of that  evidence  of
               Indebtedness or Contingent  Obligation (or a trustee on behalf of
               such holder or holders) or agreement  described in the  foregoing
               subclauses  (ii)(A) and (ii)(B) to cause,  that  Indebtedness  or
               Contingent  Obligation  to become or be declared  due and payable
               prior  to its  stated  maturity  or the  stated  maturity  of any
               underlying  obligation,  as the case may be (upon  the  giving or
               receiving of notice, lapse of time, both, or otherwise);


                                      -99-


         PROVIDED,  HOWEVER,  with respect to this SECTION  9.1(B) only,  that a
         default in  payment  or any other  breach or default by any of the Loan
         Parties or any of their  Subsidiaries or Affiliates with respect to any
         secured non-recourse  Indebtedness or any Contingent Obligation payment
         of which is secured solely by one or more  Properties  (the  "Mortgaged
         Properties") shall not constitute an Event of Default if (W) no Default
         or Event of Default shall have  previously  occurred under this SECTION
         9.1(B) (whether or not such Default or Event of Default shall have been
         waived or cured),  (X) such default  shall not  otherwise  constitute a
         Default or Event of Default  under any  provision  of this  SECTION 9.1
         other  than  this  SECTION  9.1(B),  (Y) the  principal  amount of such
         Indebtedness  or  Contingent  Obligation in default is  $95,000,000  or
         less,  and (Z) no  properties  or assets of the Loan  Parties and their
         Subsidiaries,  other  than the  Mortgaged  Properties,  are  subject to
         recourse for payment of such Indebtedness or Contingent Obligation;

              (c) (i) if default shall be made by any of the Loan Parties in the
                  performance  or  observance  of,  or shall  occur  under,  any
                  covenant contained in ARTICLE VIII of this Agreement; or

                           (ii) if  default  shall  be  made by any of the  Loan
                  Parties in the  performance  or observance  of, or shall occur
                  under, any covenant,  agreement or provision of this Agreement
                  or  any of the  other  Facility  Documents  other  than  those
                  contained in ARTICLE VIII of this Agreement,  and such default
                  shall not have been remedied  within 30 days after the date on
                  which written  notice  thereof is given to the  Borrowers,  on
                  behalf of the Loan Parties,  by the Administrative  Agent or a
                  Lender (acting through the  Administrative  Agent);  PROVIDED,
                  HOWEVER,  that if (x) such default shall result from a failure
                  of a Loan Party to furnish  either notice of the occurrence of
                  an event or to deliver a document that  describes or refers to
                  such occurrence,  and (y) the Administrative  Agent would have
                  no knowledge of such default under the terms of this Agreement
                  unless so advised by such Loan Party,  then the 30-day  period
                  to  remedy  such  default  shall  commence  one  Business  Day
                  following  the date on which  such Loan Party  first  shall be
                  obligated to furnish  such notice or to deliver such  document
                  under the provisions of this Agreement; or

               (d) if any  representation  or warranty or any other statement of
          fact made or deemed made by any Loan Party in any  Facility  Document,
          or in connection with the transactions contemplated hereby or thereby,
          or in any financial statement or other writing, certificate, report or
          statement   at  any  time   furnished   by  any  Loan   Party  to  the
          Administrative  Agent  or  any  of  the  Lenders  pursuant  to  or  in
          connection  with this Agreement or the other Facility  Documents shall
          prove to have been false or  misleading  in any material  respect when
          made or deemed made or furnished; or


                                     -100-


               (e) if any of the Loan Parties  (other than a Loan Party which is
          in default,  or defaults by virtue of taking action  described in this
          clause (e),  under  secured or  non-recourse  Indebtedness  where such
          default  does not  constitute  an Event of Default by operation of the
          proviso of clause (b) of this  SECTION  9.1) shall file a petition  or
          seek relief under or take  advantage of any  insolvency  law;  make an
          assignment for the benefit of its creditors; commence a proceeding for
          the  appointment  of a receiver,  trustee,  liquidator,  custodian  or
          conservator  of  itself or of the  whole or  substantially  all of its
          property;  file a petition  or an answer to a petition  (other than an
          answer  seeking  to dismiss  the  petition)  under any  chapter of the
          Bankruptcy  Code;  or file a  petition  or seek  relief  under or take
          advantage of any other  similar law or statute of the United States of
          America, any State, or any foreign country; or

               (f) if any court of competent  jurisdiction shall enter an order,
          judgment or decree  appointing  or  authorizing  a receiver,  trustee,
          liquidator, custodian or conservator of any of the Loan Parties (other
          than a Loan Party  which is in  default,  or defaults by virtue of the
          taking of an action  described  in this clause (f),  under  secured or
          non-recourse  Indebtedness  where such default does not  constitute an
          Event of Default  by  operation  of the  proviso of clause (b) of this
          SECTION 9.1) or of the whole or substantially all of its property,  or
          enter an order for relief  against any of the Loan Parties (other than
          a Loan Party which is in default,  or defaults by virtue of the taking
          of  an  action   described  in  this  clause  (f),  under  secured  or
          non-recourse  Indebtedness  where such default does not  constitute an
          Event of Default  by  operation  of the  proviso of clause (b) of this
          SECTION 9.1) in any case commenced under any chapter of the Bankruptcy
          Code,  or grant relief  under any other  similar law or statute of the
          United States of America,  any State, or any foreign  country;  or if,
          under the  provisions  of any law for the relief or aid of debtors,  a
          court of competent  jurisdiction or a receiver,  trustee,  liquidator,
          custodian  or  conservator  shall  assume  custody  or control or take
          possession  of any of the Loan Parties  (other than a Loan Party which
          is in  default,  or  defaults  by  virtue  of the  taking of an action
          described  in  this  clause  (f),   under   secured  or   non-recourse
          Indebtedness  where  such  default  does  not  constitute  an Event of
          Default by operation of the proviso of clause (b) of this SECTION 9.1)
          or of the whole or  substantially  all of the property of any thereof;
          or if there is commenced against any of the Loan Parties (other than a
          Loan Party which is in default, or defaults by virtue of the taking of
          an action  described in this clause (f), under secured or non-recourse
          Indebtedness  where  such  default  does  not  constitute  an Event of
          Default by operation of the proviso of clause (b) of this SECTION 9.1)
          any  proceeding  for any of the  foregoing  relief or if a petition is
          filed  against  any of the Loan  Parties or any of their  Subsidiaries
          under any chapter of the  Bankruptcy  Code or under any other  similar
          law or statute of the United States of America or any state thereof or
          any  foreign   country  and  such   proceeding  or  petition   remains
          undismissed  for a period  of 60 days;  or if any of the Loan  Parties
          (other than a Loan Party which is in default, or defaults by virtue of
          the taking of an action described in this clause (f), under secured or
          non-recourse  Indebtedness  where such default does not  constitute an
          Event of Default  by  operation  of the  proviso of clause (b) of this
          SECTION 9.1) or any of their  Subsidiaries by any act indicates its or
          their consent to,  approval of or  acquiescence in any such proceeding
          or petition; or


                                     -101-


               (g) if any of  the  Loan  Parties  shall  admit  in  writing  its
          inability  to, or be generally  unable to, pay its debts as such debts
          become due; or

               (h) if any judgment or judgments  against any of the Loan Parties
          or any of their  Subsidiaries  or any attachment or execution  against
          any of its property for any amount or amounts at any time  aggregating
          in excess of $500,000,  and such  judgments,  attachment  or execution
          remains unpaid, unstayed, undismissed or unbonded for a period of more
          than 30 days; or

               (i) if any of the Facility Documents for any reasons attributable
          to an act or  omission  of a  Person  other  than an Agent or a Lender
          shall be terminated or shall cease to be in full force and effect,  or
          if the validity or enforceability  thereof shall be contested by or on
          behalf of any Loan Party  (proof of  payment  shall not  constitute  a
          contest of a guaranty); or

               (j) if, for any  reason,  any  provision  of any  agreement  that
          provides for the subordination of any Indebtedness to the Notes or any
          other obligations of the Loan Parties to the Administrative Agent, the
          Syndication  Agent,  the  Documentation  Agent or any Lender  shall be
          invalidated  or otherwise  shall cease to be in full force and effect;
          or

               (k)  if  the  title  of  the  Loan  Parties  to any or all of the
          Properties shall be invalidated by any court of competent jurisdiction
          and the Loan Parties  shall not have prepaid the Loans within five (5)
          days  after  such  invalidation  if a Loan  Party  was a party  to the
          related  proceeding or within  fifteen (15) days after any  Authorized
          Officer  of a Loan  Party had  actual  knowledge  thereof in all other
          cases; or


                                     -102-


               (l) if one or more ERISA Events occurs which  individually  or in
          the aggregate  results in or might reasonably be expected to result in
          liability  of the Loan  Parties or any of their  ERISA  Affiliates  in
          excess of  $100,000  during  the term of this  Agreement;  or if there
          exists  an amount of  unfunded  pension  liabilities  (as  defined  in
          Section  4001(a)(18) of ERISA),  individually  or in the aggregate for
          all Pension  Plans  (excluding  for purposes of such  computation  any
          Pension   Plans  with   respect  to  which   assets   exceed   benefit
          liabilities), which exceeds $100,000;

               (m) if William Wilson III or John Moody shall no longer be active
          in the management of Cornerstone and a replacement satisfactory to the
          Administrative  Agent  shall not have been  obtained  within  120 days
          thereof;

               (n) (i) if any provision of the Pledge  Agreement  shall cease to
          be valid and binding on or enforceable  against  Cornerstone LP or any
          Loan Party party  thereto,  or  Cornerstone LP or any Loan Party party
          thereto  shall so state in  writing  or bring an  action  to limit its
          obligations or liabilities thereunder; or

                    (ii) if the Pledge  Agreement  shall for any  reason  (other
               than  pursuant  to the  terms  thereof)  cease to  create a valid
               security  interest  in the  collateral  purported  to be  covered
               thereby or such security  interest  shall for any reason cease to
               be a perfected and first priority security  interest; 

               (o) if Cornerstone  or a  Wholly-Owned  Subsidiary of Cornerstone
          shall cease to be the sole general partner of Cornerstone LP; or

               (p) if any  event  or  change  shall  occur  that has  caused  or
          evidences,  either in any case or in the aggregate, a Material Adverse
          Effect or a Material Adverse Change;

                                     -103-


then, in the case of an Event of Default described in SECTION 9.1(E), (F) OR (G)
hereof, the unpaid balance of all Notes and all interest accrued thereon and any
accrued and unpaid fees and expenses and other amounts due and payable hereunder
or under any other Facility  Document  automatically  (without any action on the
part of the Administrative Agent or the Lenders and without presentment, demand,
protest  or notice  of any  kind,  all of which  are  hereby  expressly  waived)
forthwith  shall become due and payable,  and, in the case of any other Event of
Default, then and in any such event, and at any time thereafter,  if such or any
other Event of Default shall then be continuing,  the Administrative  Agent, (i)
upon the  direction of the Lenders  holding not less than 50.1% of the aggregate
amount of the Commitments,  shall declare the Commitments terminated,  whereupon
the Commitments shall be immediately terminated,  and (ii) upon the direction of
the  Lenders  holding  not  less  than  50.1%  of the  aggregate  amount  of the
Commitments,  shall declare the Notes to be due and payable, and the then unpaid
balance of all Notes shall be accelerated and the same, and all interest accrued
thereon and any accrued and unpaid fees and expenses  and other  amounts due and
payable  hereunder or under any other Facility  Document  forthwith shall become
due and payable (without presentment, demand, protest or notice of any kind, all
of which are hereby expressly waived),  anything contained herein in Notes or in
any other Facility Document to the contrary notwithstanding.

                  SECTION 9.2.  Suits for  Enforcement.  In case any one or more
Events of Default shall occur and be continuing,  the  Administrative  Agent, on
behalf of the Agents and the Lenders,  may proceed to protect and enforce  their
rights or  remedies  either  by suit in  equity  or by  action at law,  or both,
whether  for the  specific  performance  of any  covenant,  agreement  or  other
provision contained herein, in the other Facility Documents,  or in any document
or instrument  delivered in connection with or pursuant to this Agreement or the
other  Facility  Documents  or to enforce  the payment of the Notes or any other
legal or equitable right or remedy.

                  SECTION  9.3.  Rights  and  Remedies  Cumulative.  No right or
remedy  herein  conferred  upon the  Lenders  or the  Agents is  intended  to be
exclusive of any other right or remedy contained herein or in the other Facility
Documents  or in any  instrument  or document  delivered in  connection  with or
pursuant to this Agreement or the other Facility Documents, and every such right
or remedy shall be cumulative and shall be in addition to every other such right
or remedy contained herein and therein or now or hereafter existing at law or in
equity or by statute, or otherwise.

                  SECTION  9.4.  Rights and  Remedies  Not Waived.  No course of
dealing between the Loan Parties and any Lender or Agent or any failure or delay
on the part of the  Administrative  Agent in  exercising  any rights or remedies
hereunder  shall operate as a waiver of any rights or remedies of such Lender or
the  Administrative  Agent on behalf  of the  Lenders  and no single or  partial
exercise  of any  rights or  remedies  hereunder  shall  operate  as a waiver or
preclude the exercise of any other rights or remedies hereunder.


                                     -104-

                  SECTION 9.5.  Waiver of Stay.  The Loan Parties hereby jointly
and severally agree that, if any event  described in SECTION 9.1(F),  (G) OR (H)
hereof shall occur, the Administrative  Agent and the Lenders thereupon shall be
entitled,  and the Loan Parties  hereby  irrevocably  consent,  to immediate and
unconditional  relief  from any  automatic  stay  imposed by Section  362 of the
Bankruptcy  Code,  or  otherwise,  on or against the  exercise of the rights and
remedies  otherwise  available  to the Agents and the Lenders as provided in the
Facility  Documents  or otherwise  provided by law, and the Loan Parties  hereby
jointly and severally  irrevocably  waive any right to object to such relief and
will not contest any motion by the Administrative  Agent seeking relief from the
automatic  stay,  and the Loan Parties will  cooperate  with the  Administrative
Agent and the Lenders,  in any manner requested by the Administrative  Agent, in
its effort to obtain relief from any such stay or other prohibition.

                  SECTION 9.6. Additional  Advances and Disbursements.  The Loan
Parties agree that,  upon the  occurrence of a Default or Event of Default,  the
Administrative  Agent shall have the right,  but not the obligation,  in its own
name acting for the account of the Loan Parties, and upon two (2) Business Days'
prior written notice to the Borrowers, on behalf of the Loan Parties, to advance
all or any part of amounts  owing or to perform any or all  required  actions to
prevent  or remedy  any such  Default or Event of  Default.  No such  advance or
performance shall be deemed to have cured such Default or Event of Default.  All
sums  advanced  and  all  expenses  incurred  by  the  Administrative  Agent  in
connection  with such  advances  or  actions,  and all other  sums  advanced  or
expenses  incurred by Administrative  Agent hereunder,  under any other Facility
Document or under  applicable  law  (whether  required  or optional  and whether
indemnified  hereunder or thereunder or not) shall be part of the obligations of
the Loan  Parties to the  Administrative  Agent and the  Lenders  and shall bear
interest at the Default Rate. Upon making any such advance,  the  Administrative
Agent  shall be  subrogated  to all of the rights of the Person  receiving  such
advance.


                                     -105-



                                    ARTICLE X
                                  MISCELLANEOUS

                  SECTION 10.1.  Administration and Collection Costs.

                  (a) The  Loan  Parties  jointly  and  severally  agree to pay,
within 30 days after receipt of an invoice  therefor  (accompanied  by customary
supporting  materials),  the reasonable fees and expenses of the  Administrative
Agent incurred in connection with the administration of the Facility (including,
without  limitation,  the  preparation,  negotiation and closing of the Facility
Documents  and  amendments  of and waivers  thereto,  the  delivery,  release or
substitution of any collateral,  and the monitoring or, to the extent  requested
by the Loan  Parties or  required  as a necessary  party,  participating  in any
foreclosure, condemnation or other legal proceeding relating to any Property).

                  (b) In the  event  that,  upon the  occurrence  of an Event of
Default,  the Administrative  Agent or any of the Lenders shall retain or engage
an attorney or attorneys  to collect or enforce or protect the  interests of the
Administrative Agent and the Lenders with respect to this Agreement,  any of the
other Facility  Documents,  or any instrument or document  delivered pursuant to
this Agreement or any other Facility Document,  including,  without  limitation,
each of the documents referred to in ARTICLE VI hereof, or to protect the rights
of any holder or holders  with  respect  thereto,  including  in  bankruptcy  or
insolvency  proceedings,  the Loan Parties  jointly and severally  agree to pay,
within 30 days after receipt of an invoice  therefor  (accompanied  by customary
supporting  materials),  all  of the  reasonable  costs  and  expenses  of  such
collection,  enforcement  or  protection,  including  attorneys'  fees,  of  the
Administrative Agent and the Lenders, and the Administrative Agent, on behalf of
the  Lenders  or the  holders  of such  Notes,  as the case may be, may seek and
obtain  judgment  for all such  amounts,  in  addition  to the unpaid  principal
balance of the Notes and  accrued  interest  thereon  and any accrued and unpaid
fees and expenses due and payable hereunder.

                  (c) In the event that the Initial Funding Date does not occur,
the Loan Parties  nonetheless jointly and severally agree to pay, within 30 days
after  receipt of an  invoice  therefor  (accompanied  by  customary  supporting
materials),  to the Administrative Agent all reasonable  third-party fees, costs
and  expenses  incurred or  sustained by the Agents  (including  all  reasonable
attorneys'  fees and  disbursements  of independent  counsel  retained by it) in
connection with the preparation,  execution and delivery of this Agreement,  the
other Facility  Documents and any related  documents and the other  transactions
contemplated by ARTICLE II hereof.

                  (d) The  provisions  of this  SECTION  10.1 shall  survive the
termination of this Agreement.

                  SECTION 10.2.  Modification  and Waiver.  (a) No modification,
amendment  or waiver of any  provision  of this  Agreement,  the other  Facility
Documents or any other  documents  executed in connection  herewith or therewith
and no  consent  by the  Lenders or the  Administrative  Agent to any  departure
therefrom  by the Loan  Parties  shall be  effective  unless such  modification,
amendment,   waiver  or  consent   shall  be  in  writing   and  signed  by  the
Administrative  Agent and the Required  Lenders or the  Administrative  Agent on
behalf of the Required  Lenders and, in the case of a modification  or amendment
(other than those  described in SECTION  10.2(B)(IV)  hereof),  by an Authorized
Officer of the Loan Parties,  and the same shall then be effective  only for the
period  and on the  conditions  and  for the  specific  instances  and  purposes
specified in such writing.


                                     -106-


                  (b)  Notwithstanding the provisions of SECTION 10.2(A) hereof:

                  (i) no provision  hereof that expressly  requires the consent,
         approval or waiver by all  Lenders  may be amended,  modified or waived
         except by all Lenders,

                  (ii) none of the following may be amended,  modified or waived
         except with the written consent of all Lenders:

                           (A) the  definitions of "Adjusted  Eurodollar  Rate,"
                  "Alternate Base Rate,"  "Applicable  Margin,"  "Default Rate,"
                  "Event of Default,"  "Required Lenders," and all defined terms
                  used in such definitions,

                           (B) any  provision  in any manner that would have the
                  effect of: (I)  increasing  the amount  (except as provided in
                  SECTION 2.14 hereof) or extending  the term of the  Commitment
                  of any Lender,  (II)  postponing or delaying any date fixed by
                  this Agreement or any other Facility  Document for any payment
                  of  principal,  interest,  fees or  other  amounts  due to the
                  Lenders (or any of them) hereunder or under any other Facility
                  Document,  (III)  reducing  the  principal  of, or the rate of
                  interest  specified  herein on any Loan or Note or any fees or
                  other  amounts  (excluding  fees set forth in the Fee  Letter,
                  which may be waived by the Agents alone) payable  hereunder of
                  under any other Loan Document, (IV) changing the percentage of
                  the Commitments or of the aggregate unpaid principal amount of
                  the Loans which is required  for the Lenders or any of them to
                  take any action  hereunder,  or (V) releasing any rights under
                  any guaranty applicable to, or collateral securing,  the Loans
                  (except as otherwise provided herein or therein), and

                           (C)      SECTIONS 2.9, 2.12, 3.3, 6.1, 8.9, 8.10, 9.1
         10.2 AND 10.9 hereof;


                                     -107-


                           (iii) none of the  following  may be  amended,
         modified or waived  except with the written  consent of all Lenders and
         the Agents:

                           (A) the definitions of "Aggregate Commitment,"
                  "Commitment,"   "Loans,"   "Pro  Rata  Share,"  or  any  other
                  provisions of this Agreement  which relate to the Loans or the
                  Aggregate Commitment, and

                           (B) any  provision  governing or providing  for 
         fees or other  amounts  payable to the Agents,

                  (iv) no amendment or  modification  to any of the  definitions
         used in SECTIONS 8.9,  8.10(I) OR 8.10(III) of this Agreement  shall be
         effective as to those sections  unless such  amendment or  modification
         has been  approved  with the  written  consent of all  Lenders  and the
         Agents,  but such such  amendment or  modification  shall  otherwise be
         effective  with respect to all other  provisions of this Agreement with
         the consent of the Required Lenders;

                  (v)  none  of  the  following  shall  require  the  consent,
         authorization or approval of the Loan Parties:

                           (A)     amendment or modification of any agreement to
         which no Loan Party is a party, and

                           (B)     amendment or  modification  of ARTICLE XI
                  hereof (other than any amendment or modification that would in
                  any way either impair existing rights of or impose  additional
                  obligations on the Loan Parties), and

                  (iv) any amendment to any Subordinated Debt that decreases the
         rate of interest  paid  thereon or extends the maturity  thereof  shall
         require only the written consent of the Administrative Agent.

None of the  provisions of ARTICLE XI hereof may be amended,  modified or waived
except with the written  consent of the  Administrative  Agent.  No notice to or
demand on the Loan  Parties in any case shall  entitle  the Loan  Parties to any
other or further notice or demand in similar or other circumstances.

                  SECTION 10.3.  GOVERNING LAW. THIS AGREEMENT,  THE NOTES,  THE
OTHER FACILITY  DOCUMENTS AND THE RIGHTS AND DUTIES OF THE PARTIES HEREUNDER AND
THEREUNDER AND WITH RESPECT TO INTEREST,  SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE  WITH,  THE  LAWS  OF THE  STATE  OF  NEW  YORK,  INCLUDING,  WITHOUT
LIMITATION,  SECTION 5-1401 OF THE GENERAL OBLIGATIONS LAW, EXCEPT TO THE EXTENT
THAT THE LAWS OF ANOTHER JURISDICTION ARE MANDATORILY APPLICABLE TO THE EXERCISE
OF REMEDIES AND THE PERFECTION OF LIENS AND SECURITY  INTERESTS UNDER THE UCC OR
OTHER LAWS.


                                     -108-


                  SECTION 10.4. Notices. All notices, requests, demands or other
communications  provided  for herein  shall be in writing and shall be deemed to
have been  given  (i)  three  Business  Days  after  the date  mailed if sent by
registered or certified mail, postage prepaid, return receipt requested, (ii) on
the day of delivery if personally delivered,  addressed,  as the case may be, to
the Lenders as follows:

(a)      To the Administrative Agent at:

         Bankers Trust Company
         130 Liberty Street
         25th Floor
         New York, New York 10006
         (Attention: Alexander Johnson)
         Telecopy No.: 212/669-0752

         With a copy to:

         Willkie Farr & Gallagher
         787 Seventh Avenue
         New York, New York 10019
         (Attention:  Monty Davis);
         Telecopy No.:  212/728-8111

(b)      To the Syndication Agent at:

         The Chase Manhattan Bank
         380 Madison Avenue
         New York, New York 10017

         (Attention: Commercial Real Estate Finance)
         Telecopy No.: 212/622-3397

         With a copy to:

         The Chase Manhattan Bank
         Legal Department
         270 Park Avenue
         39th Floor
         New York, New York 10017

         (Attention: William C. Viets, Esq.)
         Telecopy No.: 212/270-2876

         And with a copy to:

         Willkie Farr & Gallagher
         787 Seventh Avenue
         New York, New York 10019
         (Attention:  Monty Davis);
         Telecopy No.:  212/728-8111


                                     -109-


(c)      To the Documentation Agent at:

         NationsBank, N.A.
         901 Main Street
         51st Floor
         Dallas, Texas 75202-3714

         (Attention: Patrick Trowbridge)
         Telecopy No.: 214/508-0085

         With a copy to:

         Willkie Farr & Gallagher
         787 Seventh Avenue
         New York, New York 10019
         (Attention:  Monty Davis);
         Telecopy No.:  212/728-8111

(d)      To the Lenders at the  respective  addresses set forth on the signature
         pages hereof under the caption "Address for Notices"; and

(d)      To each of the Loan Parties at:

         c/o Cornerstone Properties Inc.
         126 East 56th Street
         New York, New York 10019
         (Attention: Kevin Mahoney)
         Telecopy No.: 212/605-7199

         With a copy to:

         King & Spalding
         191 Peachtree Street
         Atlanta, Georgia 30303

         (Attention: William B. Fryer, Esq.)
         Telecopy No.: 404/572-5100

or to such other  person or address as any party  shall  designate  to the other
parties from time to time in writing  forwarded in like manner,  or (iii) on the
day of  transmission  if sent by  telecopier  and  confirmed  (if  such day is a
Business Day or, if not, on the next  succeeding  Business Day), on the same day
as such notice is sent, by telephonic  notice (if such day is a Business Day or,
if not, on the next succeeding  Business Day) or by one of the other two methods
listed above.

                  SECTION  10.5.  Accounting  Terms.  All  accounting  terms not
specifically  defined  herein  shall  be  construed  in  accordance  with  GAAP,
consistently  applied.  Where any  accounting  determination  or  calculation is
required to be made under this  Agreement,  such  determination  or  calculation
(unless otherwise  provided) will be made in accordance with GAAP,  consistently
applied  except that if because of a change in GAAP, the Loan Parties would have
to alter a previously utilized accounting method or policy in order to remain in
compliance with GAAP, such determination or calculation will continue to be made
in accordance  with the Loan  Parties'  previous  accounting  methods or policy.
Unless  otherwise  specified  herein all  financial  statements  required  to be
delivered  hereunder  shall  be  prepared  and all  financial  records  shall be
maintained in accordance with GAAP.


                                     -110-


                  SECTION  10.6.   Indemnity.   The  Loan  Parties  jointly  and
severally  agree to indemnify  and save  harmless the Lenders and the Agents and
each   of   their   respective   officers,    directors,    employees,   agents,
attorneys-in-fact and Affiliates from and against any and all actions, causes of
action, suits, losses, liabilities and damages and expenses (including,  without
limitation,  reasonable  attorneys' fees) in connection therewith (herein called
the "Indemnified  Liabilities")  incurred by the Lenders or either of the Agents
or any of their respective officers, directors, employees, agents, attorneys-in-
fact or Affiliates (in their  respective  capacities as such) as a result of, or
arising out of or relating to, any of the transactions contemplated hereby or by
the other Facility Documents, any breach hereof or thereof, matters arising from
or at the Properties and any work, use or negligence thereat or thereof,  except
for any Indemnified  Liabilities  arising on account of the gross  negligence or
willful misconduct of the Person seeking indemnity hereunder; PROVIDED, HOWEVER,
that, if and to the extent such agreement to indemnify may be unenforceable  for
any reason, the Loan Parties shall make the maximum  contribution to the payment
and  satisfaction  of  each  of  the  Indemnified  Liabilities  which  shall  be
permissible  under  applicable  law. The  agreements  in this SECTION 10.6 shall
survive the termination of this Agreement.

                  SECTION  10.7.  WAIVER OF JURY TRIAL AND  SETOFF.  EACH OF THE
LOAN PARTIES,  THE AGENTS AND THE LENDERS HEREBY WAIVES (TO THE EXTENT PERMITTED
BY LAW) THE RIGHT TO A TRIAL BY JURY IN ANY LITIGATION IN ANY COURT WITH RESPECT
TO, IN CONNECTION  WITH, OR ARISING OUT OF THIS  AGREEMENT,  THE OTHER  FACILITY
DOCUMENTS OR ANY INSTRUMENT OR DOCUMENT  DELIVERED PURSUANT TO THIS AGREEMENT OR
THE OTHER  FACILITY  DOCUMENTS,  OR THE  VALIDITY,  PROTECTION,  INTERPRETATION,
COLLECTION  OR  ENFORCEMENT  THEREOF,  OR ANY OTHER  CLAIM OR DISPUTE  HOWSOEVER
ARISING,  BETWEEN ANY LOAN PARTIES AND ANY OF THE LENDERS OR THE AGENTS, BETWEEN
ANY LOAN PARTIES OR ANY SUBSIDIARIES  THEREOF,  BETWEEN ANY LENDERS, AND BETWEEN
ANY  AGENT  AND ANY  LENDERS;  AND THE LOAN  PARTIES  HEREBY  WAIVE THE RIGHT TO
INTERPOSE ANY SETOFF,  COUNTERCLAIM  OR CROSS-CLAIM IN CONNECTION  WITH ANY SUCH
LITIGATION,   IRRESPECTIVE  OF  THE  NATURE  OF  SUCH  SETOFF,  COUNTERCLAIM  OR
CROSS-CLAIM (UNLESS SUCH SETOFF, COUNTERCLAIM OR CROSSCLAIM COULD NOT, BY REASON
OF ANY APPLICABLE  FEDERAL OR STATE PROCEDURAL  LAWS, BE INTERPOSED,  PLEADED OR
ALLEGED IN ANY OTHER ACTION).

                  SECTION 10.8.  Captions.  The captions of the various sections
and  paragraphs  of this  Agreement  have been  inserted only for the purpose of
convenience;  such  captions are not a part of this  Agreement  and shall not be
deemed  in any  manner  to  modify,  explain,  enlarge  or  restrict  any of the
provisions of this Agreement.


                                     -111-


                  SECTION 10.9. Lien; Setoff by Lenders. (a) Upon the occurrence
of any Event of Default, the Agents and the Lenders are hereby authorized at any
time and from  time to time,  without  notice to the Loan  Parties,  to set off,
appropriate  and apply any or all items  hereinabove  referred  to  against  all
Indebtedness  of the Loan Parties to the Agents and the Lenders,  whether  under
this  Agreement,  the Notes or otherwise,  and whether now existing or hereafter
arising.  Each Agent and each Lender agree  promptly to notify  Cornerstone,  on
behalf of the Loan  Parties,  after any such setoff and  application  is made by
such Agent or Lender;  PROVIDED,  HOWEVER,  that the failure to give such notice
shall be  without  penalty to the Agents or the  Lenders  and in no event  shall
affect the validity of such setoff and application.

                  (b) Each  holder of a Note  agrees  that if it shall,
through the  exercise  of a right of  banker's  lien,  setoff,  counterclaim  or
otherwise, obtain payment with respect to any Note that results in its receiving
more than the share of the  aggregate  payments or  reductions of all Notes such
holder  would have  received in the absence of such action,  it shall  forthwith
purchase  from such other  holders a  participation  in all of the Notes held by
such  other  holders  so that the  relative  amounts  of all  unpaid  Notes  and
participations   therein  held  by  all  holders  shall  be  reinstated  to  the
proportions existing prior to such action.

                  (c) The Loan Parties  jointly and  severally  expressly
consent to the  foregoing  arrangements  in SECTION  10.9(B)  and agree that any
holder of a participation  in a Note so acquired may exercise any and all rights
of banker's lien, setoff,  counterclaim or otherwise with respect to any and all
monies  owing by such holder to the Loan Parties as fully as if such holder were
a holder of a Note in the amount of such participation. If all or any portion of
any such excess  payment is thereafter  recovered from the holder which received
the same, the purchase provided for in SECTION 10.9(B) hereof shall be rescinded
to the extent of such recovery, without interest.

                  (d) Each  Lender  agrees that if and to the extent that
any amount  received  by the  Administrative  Agent or any Lender  from any Loan
Party is subsequently  invalidated,  declared to be fraudulent or  preferential,
set aside or  judicially  required  to be repaid to a trustee,  receiver  or any
other person under any applicable creditors' remedy proceeding with respect to a
Loan Party,  including without limitation any bankruptcy  proceeding,  the other
Lenders  hereto  shall  purchase  from the  Lender  from  which  said  amount is
recovered an additional  participation in such amount equal to such Lender's Pro
Rata Share of that amount. The amount invalidated,  declared to be fraudulent or
preferential,  set aside or  judicially  required  to be  repaid  to a  trustee,
receiver or any other person under any applicable  creditors'  remedy proceeding
shall be deemed to be an amount immediately due and owing from the Loan Parties.

                   SECTION  10.10.  Jurisdiction;  Service of Process.  The Loan
Parties,  each  Agent,  and  each  Lender  hereby  irrevocably  consent  to  the
non-exclusive jurisdiction of the Courts of the State of New York, County of New
York, and of any Federal Court located in the Southern District of New York, and
agrees that venue in each of such Courts is proper in connection with any action
or proceeding  arising out of or relating to this Agreement,  the other Facility
Documents, or any document or instrument delivered pursuant to this Agreement or
the other  Facility  Documents.  Nothing  herein  shall  affect the right of the
Administrative  Agent  or any  Lender  to  serve  process  in any  other  manner
permitted by law or to commence legal  proceedings or otherwise  proceed against
any Loan Party in any other  jurisdiction  if, in the sole  determination of the
Administrative  Agent or such Lender,  such proceeding or action is necessary or
desirable  in order to enforce or give  effect to any Lien,  security  interest,
guaranty or other right granted to such party under the Facility Documents.


                                     -112-

                  SECTION 10.11.  Benefit of Agreement.  This Agreement shall be
binding  upon and inure to the benefit of the Loan  Parties,  the Agents and the
Lenders and their respective  successors and assigns, and all subsequent holders
of the Notes,  PROVIDED,  HOWEVER,  that none of the Loan  Parties may assign or
transfer any of its interests and obligations under this Agreement or any of the
other Facility Documents without the prior written consent of the Lenders.

                  SECTION 10.12. Counterparts. This Agreement may be executed by
the  parties  hereto  individually  or  in  any  combination,  in  one  or  more
counterparts, each of which shall be an original and all of which shall together
constitute one and the same agreement. Delivery of an executed signature page of
this  Agreement  by facsimile  transmission  shall be effective as delivery of a
manually executed counterpart thereof.

                  SECTION  10.13.  Interest.  (a)  Usury  Limitation.  It is the
intention  of the  parties  hereto to conform  strictly to the usury laws now in
force  in  the  appropriate  controlling  jurisdiction.   Accordingly,   if  the
transactions  contemplated hereby would be usurious,  under any controlling law,
then, in that event, notwithstanding anything to the contrary in this Agreement,
the  Notes or any other  instrument  or  agreement  entered  into in  connection
therewith,  it is agreed as  follows:  (i) the  aggregate  of all  charges  that
constitute  interest  under the laws of the  controlling  jurisdiction  that are
contracted  for,  chargeable or receivable  under this Agreement or under any of
the other  aforesaid  instruments or agreements or otherwise in connection  with
the Notes ("Interest") shall under no circumstances exceed the maximum amount of
interest permitted by law (the "Maximum Amount"),  and any Interest in excess of
the  Maximum  Amount  shall be canceled  automatically  and shall not be payable
under this Agreement,  the Notes or the aforesaid instruments or agreements and,
if theretofore  paid,  shall be either  refunded to the Loan Parties or credited
ratably on the  principal of the Notes;  and (ii) in the event that the maturity
of the Notes is  accelerated  by reason of an election of the  Required  Lenders
resulting from any Event of Default under this Agreement or otherwise, or in the
event of any prepayment by any of the Loan Parties permitted or required by this
Agreement,  the Notes or any of the other  aforesaid  instruments or agreements,
then  Interest  may never  include  more than the  Maximum  Amount,  and  excess
Interest,  if  any,  shall  be  canceled  automatically  as of the  date of such
acceleration or prepayment, and if theretofore paid, shall be either refunded to
the Loan Parties or credited  ratably on the  principal of the Notes;  PROVIDED,
HOWEVER,  that nothing  contained in this SECTION 10.13 shall be deemed to imply
that the laws of any State  other than the State of New York shall  govern  this
Agreement or the Notes.


                                     -113-


                  (b)  Recapture.  (i) If, at any time,  Interest  would
exceed the  Maximum  Amount but for the  foregoing  limitation,  Interest  shall
remain at the  Maximum  Amount,  notwithstanding  any  subsequent  reduction  of
Interest, until the total amount of Interest equals the amount of Interest which
would have accrued if Interest had not been limited to the Maximum  Amount,  but
nothing in this  paragraph  shall  affect or extend the  maturity  of any of the
Notes.

                  (ii) If, at maturity or final payment of any of the Notes, the
total  amount of Interest  paid is less than the total  amount of Interest  that
would have accrued had Interest not been limited to the Maximum Amount, the Loan
Parties jointly and severally agree, to the full extent permitted by law, to pay
to the Lenders an amount equal to the positive  difference,  if any,  derived by
subtracting (x) the amount of Interest that accrued on the Notes pursuant to the
provisions of SECTION  10.13(A)  hereof from (y) the LESSER of (i) the amount of
Interest  that would have accrued on the Notes if the Maximum  Amount had at all
times been in effect, and (ii) the amount of Interest that would have accrued if
Interest on the Notes, not limited to the Maximum Amount,  had at all times been
in effect.

                  SECTION  10.14.  Attorneys'  Fees. As used in this  Agreement,
"attorneys'  fees" shall include,  but not be limited to, all reasonable fees of
counsel (including,  without limitation, those incurred on appeals) arising from
such services and all reasonably  incurred  expenses,  costs,  charges and other
fees of such counsel,  and all such fees required to be paid by the Loan Parties
under this Agreement  shall  constitute  Indebtedness of the Loan Parties to the
Agents and the Lenders under this Agreement.

                  SECTION 10.15.  Severability.  Any provision of this Agreement
prohibited by the laws of any jurisdiction shall, as to such jurisdiction (after
giving effect to choice of law provisions  hereof), be ineffective to the extent
of such prohibition, or modified to conform with such laws, without invalidating
the remaining  provisions of this  Agreement,  and any such  prohibition  in any
jurisdiction shall not invalidate such provisions in any other jurisdiction.

                  SECTION   10.16.   Confidentiality.   (a)  The  Loan   Parties
acknowledge that from time to time financial  advisory,  investment  banking and
other  services may be offered or provided to the Loan Parties or one or more of
their   Subsidiaries  or  Affiliates  (in  connection  with  this  Agreement  or
otherwise)  by any Lender or by one or more  Subsidiaries  or Affiliates of such
Lender,  and each of the Loan Parties hereby authorizes each Lender to share any
information  delivered to such Lender by a Loan Party and its  Subsidiaries  and
Affiliates  pursuant to this  Agreement or the other Facility  Documents,  or in
connection with the decision of such Lender to enter into this  Agreement,  with
any Subsidiary or Affiliate of such Lender,  it being  understood  that any such
Subsidiary  or  Affiliate  receiving  such  information  shall  be  bound by the
provisions of SECTION 10.16(B) hereof as if it were a Lender hereunder.


                                     -114-


                  (b) Each  Lender  and each  Agent  agree (on behalf of
itself  and  each  of  its  Affiliates,   directors,   officers,  employees  and
representatives  that receives the  confidential  information  referred to below
from  such  Lender  or  such  Agent)  to  use  reasonable  precautions  to  keep
confidential,   in  accordance  with  its  customary   procedures  for  handling
confidential  information  of this nature and in accordance  with safe and sound
practices,  any  non-public  information  supplied to it by the Loan  Parties or
their  Subsidiaries  or  Affiliates  pursuant  to this  Agreement  or the  other
Facility  Documents which is identified in writing as being  confidential at the
time the same is delivered to the Lenders or the Administrative Agent; PROVIDED,
HOWEVER,  that nothing herein shall limit the disclosure of any such information
(i) to the extent  required by statute,  rule,  regulation or judicial  process,
(ii) to counsel  for any of the  Lenders or the  Agents,  (iii) to  Governmental
Authorities,  or representatives  thereof, or regulatory personnel,  auditors or
accountants,  (iv) to the Agents or any other Lender, (v) in connection with any
litigation  to which any one or more of the  Lenders  or the  Agents is a party,
(vi) to a Subsidiary or Affiliate of such Lender as provided in SECTION 10.16(A)
above,  (vii)  to any  Assignee  or  participant  (or  prospective  Assignee  or
participant) so long as such Assignee or participant (or prospective Assignee or
participant)  first executes and delivers to the respective  Lender an agreement
pursuant  to which such  Assignee or  participant  (or  prospective  Assignee or
participant)  agrees to keep  confidential  the  above-described  information on
substantially  the same terms as set forth  above,  or (viii) to the extent such
information  has become  public  otherwise  than as a result of the violation of
this SECTION 10.16(B) by the Person disclosing such information.

                  (c) In the event that any Lender  receives a request to
disclose any non-public information of the Loan Parties or their Subsidiaries or
Affiliates  under a subpoena or judicial or  administrative  order,  such Lender
shall, to the extent not prohibited by law or such legal process, (i) notify the
Loan Parties  thereof  within ten (10) days after receipt of such request,  (ii)
consult with the Loan Parties, to the extent reasonable,  on the advisability of
taking steps to resist or narrow such request (it being understood that the cost
of any such  steps  would be payable  by the Loan  Parties  within 10 days after
receipt of an invoice therefor (accompanied by customary supporting materials)),
and (iii) if  disclosure  is required  or deemed  advisable,  cooperate,  to the
extent  reasonable  (and also at the expense of the Loan Parties as described in
clause (ii)  above),  with the Loan Parties in any attempt that the Loan Parties
may  make to  obtain  an order or other  reliable  assurance  that  confidential
treatment will be accorded to designated portions of the non-public information.


                                     -115-


                  SECTION 10.17. Loss, Theft, Etc. of Notes. Upon receipt by the
Borrowers  of (i) an affidavit of an  authorized  officer of any Lender  setting
forth the fact of loss, theft or destruction of any Note and of its ownership of
the Note at the time of such loss, theft or destruction; PROVIDED, HOWEVER, that
such Lender agrees in writing to indemnify the Loan Parties, or (ii) a mutilated
Note,  such  affidavit  or  mutilated  Note shall be  accepted  as  satisfactory
evidence  thereof and no further  indemnity  shall be required as a condition to
the  execution  and  delivery  of a new Note of like tenor in lieu of such lost,
stolen, destroyed or mutilated Note without expense to the holder thereof.

                  SECTION  10.18.  Replacement  of  Lender.  At any time after a
Lender  becomes   insolvent  and  its  assets  become  subject  to  a  receiver,
liquidator, trustee, custodian, or other officer having similar powers, then the
Administrative Agent, by writing addressed to the Borrowers and such Lender, may
nominate or propose  another  bank or financial  institution  that is willing to
become the Assignee of the  Commitment  of such Lender  pursuant to SECTION 12.1
hereof (if such bank or financial  institution  is not then a Lender,  then such
proposed Assignee shall be subject (except during the continuance of an Event of
Default)  to the  consent  of the  Borrowers,  which  shall not be  unreasonably
withheld,  and,  within 10 Business  Days after  receipt of such notice from the
Administrative   Agent,   such   Lender   shall   execute  and  deliver  to  the
Administrative  Agent an  Assignment  of its entire  Commitment  in favor of the
proposed  Assignee in conformity with SECTION 12.1 hereof.  In no event will any
such Lender be required to enter into an Assignment of its Commitment at a price
less than par plus  accrued  interest and prorated  fees to the  effective  date
thereof.

                  SECTION 10.19. Entire Agreement.  This Agreement and the other
Facility Documents constitute the entire agreement among the parties relative to
the subject matter hereof and thereof.  Any previous agreement among the parties
with respect to such subject  matter is  superseded  by this  Agreement  and the
other Facility Documents as in effect as of the date hereof. In the event of any
conflict  or  inconsistency  between  the  provisions  hereof  and of any  other
Facility Document, the provisions hereof shall control.

                  SECTION  10.20.  Consent  to  Amendment  and  Restatement.  By
executing this  Agreement,  each Lender which is an Existing Lender consents and
agrees to this  amendment  and  restatement  of the Existing  Agreement  and the
transactions contemplated hereby.


                                      116


                                   ARTICLE XI
                                     AGENCY

                  The Lenders, the Administrative  Agent, the Syndication Agent,
and the Documentation Agent agree as follows:

                  SECTION 11.1.  Appointment and Actions. (a) Each Lender hereby
irrevocably  designates and appoints BANKERS TRUST COMPANY as the Administrative
Agent of such Lender  under the Facility  Documents  (including  any  additional
documents  referred to therein as "Facility  Documents").  BANKERS TRUST COMPANY
hereby agrees to act as the Administrative  Agent under the Facility  Documents.
Each  Lender  further  hereby  irrevocably  designates  and  appoints  THE CHASE
MANHATTAN  BANK as the  Syndication  Agent of such  Lender  under  the  Facility
Documents  (including any additional  documents referred to therein as "Facility
Documents").  THE CHASE  MANHATTAN BANK hereby agrees to act as the  Syndication
Agent under the  Facility  Documents.  Each Lender  further  hereby  irrevocably
designates and appoints  NATIONSBANK,  N.A. as the  Documentation  Agent of such
Lender under the Facility Documents (including any additional documents referred
to therein as "Facility Documents").  NATIONSBANK,  N.A. hereby agrees to act as
the  Documentation  Agent  under the  Facility  Documents.  Each  Lender  hereby
irrevocably  authorizes  each Agent to take such action on its behalf  under the
provisions  hereof and  thereof and to  exercise  such  powers and perform  such
duties as are expressly  delegated to such Agent by the terms hereof and thereof
together  with such  other  powers as are  reasonably  incidental  thereto.  The
Administrative  Agent  shall  hold  any  security  pledged  under  the  Facility
Documents in accordance with the terms thereof. Notwithstanding any provision to
the  contrary in this  Agreement  or any of the other  Facility  Documents,  the
Agents shall not have any duties or responsibilities  except those expressly set
forth herein or therein, nor any fiduciary  relationship with any Lender, and no
implied  covenants,   functions,   responsibilities,   duties,   obligations  or
liabilities shall be read into the Facility Documents or otherwise exist against
the Agents.

                  (b) The Agents may  execute  any of their  duties by or
through agents or  attorneys-in-fact  and shall be entitled to advice of counsel
concerning  all  matters  pertaining  to such  duties.  The Agents  shall not be
responsible for the negligence or misconduct of any agents or  attorneys-in-fact
selected by any of them with reasonable care.

                  (c) Neither  the Agents nor any  officers,  directors,
employees, agents, attorneys-in-fact or Affiliates of any of the Agents shall be
(i) liable for any action lawfully taken or omitted to be taken by the Agents or
any such  Person  under or in  connection  with  any of the  Facility  Documents
(except for its or such person's own gross negligence or willful misconduct), or
(ii)  liable in any manner to the other  Agents or any Lender for any  recitals,
statements,  representations  or  warranties  made by the  Loan  Parties  or any
Subsidiary thereof contained herein or in any certificate,  report, statement or
other document referred to or provided for in, or received by any Agent under or
in connection with any of the Facility  Documents,  or for the value,  validity,
effectiveness, genuineness, enforceability or sufficiency of any of the Facility
Documents or for any failure of any Loan Party to perform its obligations  under
any of the Facility  Documents.  The Agents shall not be under any obligation to
any Lender to ascertain or to inquire as to the observance or performance of any
of the agreements contained in, or conditions of, any of the Facility Documents,
or to inspect  the  properties,  books or records of any Loan Party or any other
Person.


                                     -117-


                  (d) Each Agent shall be entitled to rely,  and shall be
fully  protected in relying,  upon any  writing,  resolution,  notice,  consent,
certificate, affidavit, letter, cablegram, telegram, telecopy, telex or teletype
message,  statement, order or other document or conversation reasonably believed
by it to be genuine  and correct  and to have been  signed,  sent or made by the
proper  person or  persons  and upon  advice  and  statements  of legal  counsel
(including,   without  limitation,   counsel  to  a  Loan  Party),   independent
accountants  and other experts  selected by the Agents.  The Agents may deem and
treat the  payee of any Note as the  owner  thereof  for all  purposes  unless a
written  notice of assignment,  negotiation or transfer  thereof shall have been
filed in accordance with SECTION 12.1 hereof.

                  (e) Each Agent shall be fully  justified  in failing or
refusing to take any action under any of the Facility  Documents unless it shall
first  receive  such  advice or  concurrence  of the  Lenders  as it shall  deem
appropriate  or as required by the specific  terms of this Agreement or it shall
first be  indemnified  to its  satisfaction  by the Lenders  against any and all
liability  and expense  which may be incurred by any of them by reason of taking
or  continuing  to take  any such  action,  except  for  liability  and  expense
resulting  solely  from the  respective  Agent's  gross  negligence  or  willful
misconduct.  The Agents shall in all cases be fully  protected in acting,  or in
refraining from acting, under any of the Facility Documents in accordance with a
request of the Required Lenders (or all of the Lenders if specifically  required
by the  terms of this  Agreement),  and such  request  and any  action  taken or
failure to act  pursuant  thereto  shall be binding upon all the Lenders and all
future holders of the Notes.

                  (f) The  Administrative  Agent  shall not be deemed to
have knowledge or notice of the occurrence of any Default or Event of Default or
any default under any document,  agreement or instrument delivered in connection
therewith,  unless the Administrative  Agent shall have actual knowledge thereof
or shall have received notice from any Lender or any Loan Party, describing such
event,  act or  condition,  Default or Event of Default  and  stating  that such
notice is a "notice of default." In the event that the Administrative  Agent has
such actual knowledge or receives such a notice, the Administrative  Agent shall
give notice  thereof to the Lenders.  The  Administrative  Agent shall take such
action  with  respect to such  event,  act or  condition  or Default or Event of
Default as shall be reasonably  directed by the Required Lenders (or all Lenders
if specifically  required by the terms of this Agreement,  or of Lenders holding
at least 50.1% of the  Aggregate  Commitment  where  specifically  provided)  in
writing;  PROVIDED,  HOWEVER,  that, unless and until the  Administrative  Agent
shall have received such directions, the Administrative Agent may (but shall not
be  obligated  to) take such action,  or refrain  from taking such action,  with
respect to such event, act or condition, Default or Event of Default as it shall
deem advisable in the best interests of the Lenders.


                                     -118-


                  (g) Until such time as the  Administrative  Agent shall
have been  notified  in  writing  duly  executed  on behalf of any  Lender by an
officer thereof duly  authorized to take such action,  that such Lender has sold
all or a portion  of the Loans  made by, or  Commitment  of,  such  Lender,  the
Administrative  Agent  may  treat  such  Lender  as the  owner or holder of such
Lender's  share  of  the  Loans  or  Aggregate  Commitment,  as  applicable,  in
accordance with the percentages thereof advanced or held by such Lender.

                  (h) At any time or times,  in order to comply  with any
legal  requirement in any  jurisdiction,  the  Administrative  Agent may appoint
another  bank or trust  company or one or more other  Persons,  either to act as
co-administrative   agent  or   co-administrative   agents,   jointly  with  the
Administrative  Agent,  or to act as  separate  agent or agents on behalf of the
Lenders  with such power and  authority as may be  necessary  for the  effectual
operation of the  provisions  hereof and may be specified in the  instrument  of
appointment (which may, in the discretion of the Administrative  Agent,  include
provisions  for the protection of such co-agent or separate agent similar to the
provisions of this ARTICLE XI).

                  (i) The  Administrative  Agent shall  forward  promptly to the
Lenders copies of all reports,  notices,  and other  information  received by it
pursuant to SECTIONS 2.4, 2.7, 7.1, 7.2, AND 8.12 hereof.

                  SECTION  11.2.  Independent  Credit  Decisions.   Each  Lender
expressly  acknowledges  that  neither the Agents nor any  officers,  directors,
employees,  agents,  attorneys-in-fact  or Affiliates of the Agents has made any
representations  or  warranties  to it and that no act by the  Agents  hereafter
taken,  including  any  review  of the  affairs  of the Loan  Parties  and their
Subsidiaries,  shall be deemed to constitute any  representation  or warranty by
the Agents to any  Lender.  Each  Lender  represents  to the Agents that it has,
independently  and without  reliance upon the Agents or the other  Lenders,  and
based on such documents and information as it has deemed  appropriate,  made its
own  appraisal of and  investigation  into the business,  operations,  property,
financial and other condition and creditworthiness of the Loan Parties and their
Subsidiaries and made its own decision to enter into this Agreement. Each Lender
also represents that it will, independently and without reliance upon the Agents
or the other Lenders,  and based on such  documents and  information as it shall
deem  appropriate  at the  time,  continue  to  make  its own  credit  analysis,
appraisals and decisions in taking or not taking action  hereunder,  and to make
such  investigation  as it deems  necessary to inform itself as to the business,
operations,  property, financial and other condition and creditworthiness of the
Loan  Parties  and their  Subsidiaries.  Except for  notices,  reports and other
documents   expressly   required  to  be   furnished   to  the  Lenders  by  the
Administrative  Agent  hereunder,   the  Agents  shall  not  have  any  duty  or
responsibility  to  provide  any  Lender  with any  credit or other  information
concerning the business, operations,  property, financial and other condition or
creditworthiness  of the Loan Parties or their  Subsidiaries which may come into
the  possession  of any  of the  Agents  or  any  of  the  officers,  directors,
employees, agents, attorneys-in-fact or Affiliates of the Agents.


                                     -119-


                  SECTION  11.3.  Indemnification  of  Agents.  (a) Each  Lender
agrees to indemnify  Bankers  Trust  Company in its  capacity as  Administrative
Agent (to the extent not reimbursed by the Loan Parties),  ratably  according to
its  percentage  of the  Aggregate  Commitment,  from  and  against  any and all
liabilities, obligations, losses, damages, penalties, actions, judgments, suits,
costs,  expenses or  disbursements  of any kind whatsoever which may at any time
(including,  without limitation, at any time following the payment of any of the
Notes) be imposed on, incurred by or asserted against the  Administrative  Agent
in any way  relating to or arising  out of this  Agreement,  the other  Facility
Documents or the transactions contemplated hereby or thereby or any action taken
or omitted to be taken by the  Administrative  Agent under or in connection with
any of the foregoing;  PROVIDED, HOWEVER, that no Lender shall be liable for the
payment  of any  portion  of such  liabilities,  obligations,  losses,  damages,
penalties, actions, judgments, suits, costs, expenses or disbursements resulting
solely from the Administrative  Agent's gross negligence or willful  misconduct.
The  obligations  of the Lenders  under this SECTION  11.3(A)  shall survive the
payment of the Notes and related obligations.

                  (b) Each Lender agrees to indemnify The Chase  Manhattan  Bank
in its capacity as  Syndication  Agent (to the extent not reimbursed by the Loan
Parties), ratably according to its percentage of the Aggregate Commitment,  from
and against any and all liabilities,  obligations,  losses, damages,  penalties,
actions,  judgments,  suits,  costs,  expenses  or  disbursements  of  any  kind
whatsoever which may at any time  (including,  without  limitation,  at any time
following  the  payment  of any of the  Notes) be  imposed  on,  incurred  by or
asserted against the Syndication  Agent in any way relating to or arising out of
this Agreement,  the other Facility  Documents or the transactions  contemplated
hereby or thereby or any action taken or omitted to be taken by the  Syndication
Agent under or in connection with any of the foregoing;  PROVIDED, HOWEVER, that
no Lender  shall be liable for the payment of any  portion of such  liabilities,
obligations,  losses,  damages,  penalties,  actions,  judgments,  suits, costs,
expenses or disbursements  resulting  solely from the Syndication  Agent's gross
negligence  or willful  misconduct.  The  obligations  of the Lenders under this
SECTION 11.3(B) shall survive the payment of the Notes and related obligations.


                                     -120-


                  (c) Each Lender agrees to indemnify  NationsBank,  N.A. in its
capacity  as  Documentation  Agent (to the  extent  not  reimbursed  by the Loan
Parties), ratably according to its percentage of the Aggregate Commitment,  from
and against any and all liabilities,  obligations,  losses, damages,  penalties,
actions,  judgments,  suits,  costs,  expenses  or  disbursements  of  any  kind
whatsoever which may at any time  (including,  without  limitation,  at any time
following  the  payment  of any of the  Notes) be  imposed  on,  incurred  by or
asserted against the  Documentation  Agent in any way relating to or arising out
of this Agreement, the other Facility Documents or the transactions contemplated
hereby  or  thereby  or  any  action  taken  or  omitted  to  be  taken  by  the
Documentation Agent under or in connection with any of the foregoing;  PROVIDED,
HOWEVER,  that no Lender  shall be liable for the payment of any portion of such
liabilities, obligations, losses, damages, penalties, actions, judgments, suits,
costs, expenses or disbursements resulting solely from the Documentation Agent's
gross  negligence or willful  misconduct.  The  obligations of the Lenders under
this  SECTION  11.3(C)  shall  survive  the  payment  of the Notes  and  related
obligations.


                                     -121-


                  SECTION 11.4. Resignation and Succession. Any Agent may resign
as Administrative  Agent,  Syndication Agent or Documentation Agent, as the case
may be, upon 10 days' written  notice to the other  Agents,  the Lenders and the
Loan  Parties,  and the  Administrative  Agent may be removed as  Administrative
Agent with cause upon 10 days' prior written notice to such effect to the Agents
and the Loan Parties  from the Required  Lenders;  PROVIDED,  HOWEVER,  that the
resignation or removal of the  Administrative  Agent shall not become  effective
until a successor  Administrative  Agent  shall have  accepted  its  appointment
hereunder;  and PROVIDED,  further,  that in the event Bankers Trust Company, as
Administrative  Agent on and as of the Execution Date,  resigns or is removed as
Administrative  Agent,  the Lenders  shall offer to appoint The Chase  Manhattan
Bank as successor  Administrative  Agent hereunder,  which appointment The Chase
Manhattan Bank shall determine to accept or reject in its sole  discretion,  and
the Borrowers  shall be deemed to have consented to the appointment of The Chase
Manhattan Bank as successor Administrative Agent; and PROVIDED, FURTHER, that if
no successor shall have so accepted within 45 days from the date of such notice,
the Administrative Agent may appoint a Lender as successor Administrative Agent;
and PROVIDED,  FURTHER, that if the Syndication Agent or the Documentation Agent
shall resign, no successor Syndication Agent or Documentation Agent, as the case
may be,  shall be  appointed.  If the  Administrative  Agent shall  resign or be
removed as such,  then the  Required  Lenders,  with (except in a case where The
Chase Manhattan Bank becomes the successor  Administrative  Agent or an Event of
Default  exists)  the  consent  of the  Borrowers  (which  consent  shall not be
unreasonably  withheld or  delayed),  shall  appoint a successor  Administrative
Agent, as the case may be, whereupon such successor shall succeed to the rights,
powers and duties of the resigning  Agent, and the term  "Administrative  Agent"
shall mean such successor  Administrative  Agent effective upon its appointment,
and  the   former   Administrative   Agent's   rights,   powers  and  duties  as
Administrative  Agent shall be  terminated,  without any other or further act or
deed on the part of such  former  Administrative  Agent or any of the parties to
this  Agreement  or any  holders  of  the  Notes.  After  any  retiring  Agent's
resignation  or removal  hereunder as such,  the  provisions  of this ARTICLE XI
shall inure to its benefit as to any actions  taken or omitted to be taken by it
while it was an Administrative  Agent,  Syndication Agent or Documentation Agent
under this Agreement. In the event that the Administrative Agent becomes subject
to  the  receivership  of  the  Federal  Deposit  Insurance  Corporation  or any
successor entity, such receiver commences the liquidation of such Administrative
Agent, and Lenders holding at least 10% of the Aggregate  Commitment request the
Administrative Agent to resign because of such receivership,  the Administrative
Agent's agency under this Agreement shall terminate.


                                     -122-


                                   ARTICLE XII
                               SALES AND TRANSFERS

                  SECTION  12.1.  Sales  and  Transfers.   (a)  Subject  to  the
provisions of this SECTION 12.1, any Lender, after 10 days' prior written notice
to the Borrowers and the  Administrative  Agent and subject to the prior written
consent of the  Administrative  Agent (which  consent shall not be  unreasonably
withheld), may execute an assignment and acceptance substantially in the form of
EXHIBIT E hereto,  with appropriate  insertions (herein  individually  called an
"Assignment" and  collectively  called the  "Assignments"),  whereby such Lender
(herein  each,  an  "Assignor")  shall  assign,  without  recourse  and  without
representation  or warranty except as specifically set forth in said Assignment,
to one or more Eligible Assignees (herein  individually called an "Assignee" and
collectively  called the "Assignees")  all or any part of the Assignor's  rights
and benefits, and delegate all or any part of the Assignor's obligations,  under
or in  respect  of this  Agreement,  the  Commitments,  the Loans and the Notes;
PROVIDED,  HOWEVER,  that the portion of such Lender's Commitment proposed to be
assigned is at least  $5,000,000  or, if less than  $5,000,000,  the totality of
such Lender's Commitment;  and PROVIDED,  FURTHER,  that upon the occurrence and
during  the  continuance  of  an  Event  of  Default,   none  of  the  foregoing
restrictions  shall apply,  except that while an Event of Default (other than an
Event of Default that shall have  required that the  Administrative  Agent shall
have delivered a notice of the underlying default) shall be continuing but prior
to acceleration, the applicable Lender may not make an Assignment to an Assignee
unless it shall give the  Administrative  Agent five (5) Business  Days' written
notice by telecopy of its intention to assign any or all of its interest in this
Agreement.

                  (b) Upon  execution,  delivery and  acceptance  of each
Assignment, from and after the effective date specified therein, which effective
date  shall be at least five  Business  Days after the  execution  thereof,  the
Borrowers,  the Administrative Agent, and each of the Lenders agree that, to the
extent of any such Assignment,

                  (i) the  Assignee,  in addition to any  rights,  benefits  and
         obligations  hereunder held by it  immediately  prior to such effective
         date, shall have the rights, benefits and obligations of a Lender under
         and in respect of this Agreement, the Assignor's Commitment, the Loans,
         and the  Notes as it would  have if it were a Lender  hereunder  to the
         extent that the same have been assigned and delegated to it pursuant to
         such Assignment; and

                  (ii) the  Assignor,  to the extent that  rights,  benefits and
         obligations  hereunder  have been assigned and delegated by it pursuant
         to such  Assignment,  shall  relinquish  its rights and benefits and be
         released from its obligations under this Agreement (and, in the case of
         an Assignment  covering all or the remaining  portion of the Assignor's
         rights,  benefits and obligations  under this  Agreement,  the Assignor
         shall  cease to be a Lender  hereunder),  except  that in all cases the
         Assignor shall remain entitled to the rights and benefits arising under
         SECTIONS 2.9,  2.12,  3.3, 7.12 AND 10.6 hereof and shall remain liable
         with respect to any of its obligations  arising under SECTIONS 2.9, 3.3
         OR 10.13 OR  ARTICLE  XI  hereof,  in either  case with  respect to any
         matters  arising  prior  to (or with  respect  to  SECTIONS  2.9 OR 3.3
         hereof,  any payments made by a Loan Party in respect of any additional
         cost,  reduction  or other  payment  referred to therein  prior to) the
         effective date of any such Assignment;


                                     -123-


PROVIDED,  HOWEVER,  that the  Administrative  Agent  and each  Lender  shall be
entitled to continue to deal solely and directly with the Assignor in connection
with the  interests so assigned and  delegated  to the  Assignee  until  written
notice of such Assignment,  together with addresses and related information with
respect to the Assignee,  shall have been given to the  Administrative  Agent by
the Assignor and the Assignee.

                  (c) Upon its receipt of an  Assignment  executed by the
Assignor  and an  Assignee,  together  with the Note or  Notes  (if  applicable)
subject to such  Assignment  and  (except in the case of an  assignment  for the
purposes  of   replacing  a  Lender  as  a  result  of   operation   of  SECTION
2.4(D)(III)(C), SECTION 2.9, SECTION 2.13, OR SECTION 3.3 hereof) payment by the
Assignor or the  Assignee of an  administrative  fee in the amount of $3,000 per
Assignee, the Administrative Agent, if such Assignment has been completed and is
in substantially the form of EXHIBIT E hereto,  shall accept such Assignment and
forward a  photostatic  copy thereof to the Loan Parties and the  Administrative
Agent.  Within 5 Business Days after their receipt of a photostatic copy of such
Assignment,  the Loan Parties  shall  execute and deliver to the  Administrative
Agent, to be exchanged for the Note delivered to the Administrative Agent by the
Assignor,  a new Note payable to the order of the Assignee in an amount equal to
the Commitment  assumed by it pursuant to such  Assignment  and, if the Assignor
has  retained a  Commitment  hereunder,  a new Note  payable to the order of the
Assignor in an amount equal to the Commitment retained by it hereunder. Such new
Note shall be in aggregate  principal  amount equal to the  aggregate  principal
amount  of such  surrendered  Note,  shall be dated the  effective  date of such
Assignment,  shall be payable to the order of the Assignee  and, if  applicable,
the Assignor,  otherwise shall be in substantially  the form of such surrendered
Note, and shall constitute Note(s) under this Agreement.  Such new Note shall be
in replacement and  substitution  for, and not in payment of, the Note delivered
to the  Administrative  Agent by the Assignor.  The  Administrative  Agent shall
deliver such new Note or Notes to the payee or payees thereof and shall mark the
old Note  previously  held by the Assignor as  "replaced"  and shall deliver the
same to the Borrowers.


                                     -124-


                  (d) Within five Business Days after each Assignment has
been accepted in  accordance  with the terms hereof,  the  Administrative  Agent
shall revise  EXHIBIT A hereto to set forth (i) the amount of the Commitment and
the Loans of each  Assignee  and such  Assignee's  name and address and (ii) the
amount of the Commitment and Loans,  if any,  retained by the Assignor,  and the
appropriate  officer of the Loan  Parties  and the  Administrative  Agent  shall
initial each such revision,  and the  Administrative  Agent shall deliver a copy
thereof to each Lender.

                  (e) Notwithstanding  the foregoing  provisions of this SECTION
12.1,  any Lender at any time may assign all or any portion of its rights  under
this  Agreement and the other Facility  Documents to (i) a Federal  Reserve Bank
without  complying  with  such  provisions;  PROVIDED,  HOWEVER,  that  no  such
assignment shall release the assigning Lender from its obligations  hereunder or
under the other  Facility  Documents or (ii) an Affiliate of such Lender without
consent by the Administrative Agent.

                  (f)  Each  Lender  shall  have  the  right at any time to sell
participations  to  any  other  Person  in  all or any  part  of  such  Lender's
Commitment  and the  Loans  and  interests  in  Letters  of  Credit  made by it;
PROVIDED, HOWEVER, that the holder of any participation, other than an Affiliate
of the Lender granting such participation, shall not be entitled to require such
Lender  to take or omit to take any  action  hereunder  except  action  directly
affecting (i) the extension of the scheduled final maturity date of or regularly
scheduled  maturity of any portion of the  principal  amount of, or interest on,
any Loan  allocated to such  participation  or (ii) a reduction of the principal
amount  of, or the rate of  interest  payable  on,  any Loan  allocated  to such
participation,  and all  amounts  payable by the  Borrowers  hereunder  shall be
determined as if such Lender had not sold such participation.


                                     -125-



                  THIS AGREEMENT CONTAINS A WAIVER OF TRIAL BY JURY. SEE SECTION
 10.7 HEREOF.

                  IN WITNESS WHEREOF, the Borrowers, the Guarantors,  the Agents
and the  Lenders  have  caused  this  Agreement  to be duly  executed  by  their
respective officers thereunto duly authorized as of the day and year first above
written.

                                            BORROWERS:

                                            CORNERSTONE PROPERTIES INC.

                                            By:/s/ Kevin P. Mahoney
                                               ------------------------
                                               Name: Kevin P. Mahoney
                                               Title: Senior Vice President

                                            By:/s/ Thomas P. Loftus
                                               ------------------------
                                               Name: Thomas P. Loftus
                                               Title: Vice President and
                                                       Secretary

                                            CORNERSTONE PROPERTIES LIMITED 
                                               PARTNERSHIP

                                            By: CORNERSTONE PROPERTIES INC.,
                                                Its General Partner

                                                By:/s/ Kevin P. Mahoney
                                                   ------------------------
                                                   Name: Kevin P. Mahoney
                                                   Title: Senior Vice President

                                                By:/s/ Thomas P. Loftus
                                                   ------------------------
                                                   Name: Thomas P. Loftus
                                                   Title: Vice President and
                                                          Secretary           





                                            GUARANTORS:

                                            CORNERSTONE DENVER LLC
                                            CORNERSTONE PEACHTREE LLC
                                            500 BOYLSTON CORNERSTONE LLC      
                                            222 BERKELEY CORNERSTONE LLC
                                            125 SUMMER STREET CORNERSTONE LLC
                                            CORNERSTONE MINNEAPOLIS LLC
                                            CORNERSTONE NEW YORK LLC
                                            CORNERSTONE 11 CANAL CENTER LLC
                                            CORNERSTONE 99 CANAL LLC
                                            CORNERSTONE SEATTLE LLC

                                            By: CORNERSTONE PROPERTIES LIMITED
                                                PARTNERSHIP, the sole member 
                                                of each

                                                By: CORNERSTONE PROPERTIES INC.,
                                                    its general partner

                                                By:/s/ Kevin P. Mahoney
                                                   --------------------
                                                   Name: Kevin P. Mahoney
                                                   Title: Senior Vice President

                                                By:/s/ Thomas P. Loftus
                                                   --------------------
                                                   Name: Thomas P. Loftus
                                                   Title: Vice President and
                                                          Secretary        


                                            CSTONE-PITTSBURGH TRUST
                                           
                                            By:/s/ Thomas P. Loftus
                                               --------------------
                                               Name: Thomas P. Loftus
                                               Title: Trustee

                                            By:/s/ Kevin P. Mahoney
                                               --------------------
                                               Name: Kevin P. Mahoney   
                                                  

                                            CORPRO REAL ESTATE MANAGEMENT, INC.

                                            By:/s/ Kevin P. Mahoney
                                               --------------------
                                               Name: Kevin P. Mahoney
                                               Title: Senior Vice President

                                            By:/s/ Thomas P. Loftus
                                               --------------------
                                               Name: Thomas P. Loftus
                                               Title: Vice President and
                                                      Secretary    


                                            AGENTS AND LENDERS:

                                            BANKERS TRUST COMPANY
                                                 as Administrative Agent and 
                                                 Lender

                                            By:/s/ Alexander B.V. Johnson
                                               --------------------------
                                                Title: Managing Director
                                             
                                            Address for Notices:

                                            130 Liberty Street
                                            25th Floor
                                            New York, New York 10006
                                            (Attention: Alexander Johnson)
                                            Telecopy No.: 212/669-0752


                                            THE CHASE MANHATTAN BANK
                                                 as Syndication Agent and Lender

                                            By:/s/ Frederick P. Hammer
                                               -----------------------

                                            Title: Vice President

                                            Address for Notices:

                                            380 Madison Avenue
                                            New York, New York 10017
                                            (Attention: Commercial Real Estate 
                                            Finance)
                                            Telecopy No.: 212/622-3397


                                            NATIONSBANK, N.A.
                                               as Documentation Agent and Lender

                                            By:/s/ Patrick A. Trowbridge
                                               -------------------------
                                                Title: Vice President

                                            Address for Notices:

                                            Attn: Patrick Trowbridge
                                            Vice President
                                            901 Main Street -- 51st Floor
                                            Dallas, Texas 75202
                                            Phone (214) 508-1552
                                            Fax (214) 508-0085


                                            THE BANK OF NOVA SCOTIA
                                                 as Lender

                                            By:/s/ R.H. Boese
                                               --------------
                                                Title: Sr. Relationship Manager

                                            Address for Notices:

                                            Attn: Kim Hartman
                                            Relationship Manager
                                            One Liberty Street
                                            New York, New York 10005
                                            Phone (212) 225-5175
                                            Fax (212) 225-5166


                                            COMMERZBANK AKTIENGESELLSCHAFT
                                            NEW YORK BRANCH
                                                 as Lender

                                            By:/s/ David M. Schwarz
                                               --------------------
                                                Title: Vice President
                                            
                                            By:/s/ Christine Finkel
                                               --------------------
                                                Title: Asst. Vice President 

                                            Address for Notices:

                                            Attn: Christine Finkel
                                            Vice President
                                            Two World Financial Center -- 33rd 
                                                 Floor
                                            New York, New York 10281-1050
                                            Phone (212) 266-7375
                                            Fax (212) 266-7565


                                            KEYBANK NATIONAL ASSOCIATION
                                                 as Lender

                                            By:/s/ Mary Ellen Fowler
                                               ---------------------           
                                                Title: Vice President

                                            Address for Notices:

                                            Attn: Mary Ellen Fowler
                                            Vice President
                                            127 Public Square -- 6th Floor
                                            Cleveland, Ohio 44114-1306
                                            Phone (216) 689-4915
                                            Fax (216) 689-4997


                                            PNC BANK, NATIONAL ASSOCIATION
                                                 as Lender

                                            By:/s/ Thomas Nastarowicz
                                               ----------------------
                                                Title: Vice President

                                                     Address for Notices:

                                            Attn: Thomas Nastarowicz
                                            Vice President
                                            One Pen Plaza--Suite 2504
                                            New York, New York 10119
                                            Phone (212) 967-8813
                                            Fax (212) 967-8816


                                            SUMMIT BANK
                                                 as Lender

                                            By:/s/ Gregory A. Haines
                                               ---------------------    
                                                Title: Vice President

                                            Address for Notices:

                                            Attn: Gregory A. Haines
                                            Vice President
                                            750 Walnut Avenue -- 1st Floor
                                            Cranford, New Jersey 07106
                                            Phone (908) 709-6079
                                            Fax (908) 709-6440


                                            CITIZENS BANK OF RHODE ISLAND
                                                 as Lender

                                            By:/s/ John K. Cooper
                                               ------------------
                                                Title: Vice President

                                                  Address for Notices:

                                            Attn: John K. Cooper
                                            One Citizens Plaza
                                            Providence, Rhode Island 02903
                                            Phone (401) 456-7283
                                            Fax (401) 455-5410


                                            MELLON BANK, N.A.
                                                 as Lender

                                            By:/s/ Frederick A. Felter
                                               -----------------------
                                                Title: Vice President

                                            Address for Notices:

                                            Attn: Kellie Anderson
                                            Assistant Vice President
                                            1735 Market Street -- 193-0425
                                            Philadelphia, Pennsylvania 19101
                                            Phone (215) 553-3444
                                            Fax (215) 553-3472


                                            MICHIGAN NATIONAL BANK
                                                 as Lender

                                            By:/s/ Irwin S. Knox
                                               -----------------
                                                Title: Relationship Manager

                                            Address for Notices:

                                            Attn: Irwin S. Knox
                                            Relationship Manager
                                            27777 Inkster Road
                                            Farmington Hills, Michigan 
                                            48333-9065
                                            Phone (248) 473-5277
                                            Fax (248) 473-5299


                                            FIRST AMERICAN BANK TEXAS, SSB 
                                                 as Lender

                                            By:/s/ Jeffrey C. Schultz
                                               ----------------------
                                                Title: Vice President

                                            Address for Notices:

                                            Attn: Jeff Schultz
                                            14651 Dallas Parkway
                                            Suite 400
                                            Dallas, Texas 75420
                                            Phone (972) 419-3414
                                            Fax (972) 419-3308


                                            CREDIT LYONNAIS, NEW YORK BRANCH
                                                 as Lender

                                            By:/s/ Bruce Evans
                                               ---------------
                                                Title: Vice President

                                            Address for Notices:

                                            Attn: David Meredith
                                            515 South Flower Street
                                            Suite 220
                                            Los Angeles, California 90071
                                            Phone (213) 362-5931
                                            Fax (213) 623-8067


                                            AMSOUTH BANK
                                                 as Lender

                                            By:/s/ J.R. Miller
                                               ---------------
                                                Title: Vice President

                                            Address for Notices:

                                            Attn: Jim Miller
                                            1900 Fifth Avenue
                                            9th Floor
                                            Birmingham, Alabama 35203
                                            Phone (205) 801-0282
                                            Fax (205) 326-4075


                                            U.S. BANK NATIONAL ASSOCIATION
                                                 as Lender

                                            By:/s/ James Benko
                                               ---------------        
                                                Title: Vice President

                                            Address for Notices:

                                            Attn: Jame Benkos
                                            Vice President
                                            111 East Wacker Drive
                                            One Illinois Centre--Suite
                                            3000
                                            Chicago, Illinois 60601
                                            Phone (312) 228-9434
                                            Fax (312) 228-9402


                                            THE BANK OF NEW YORK
                                                 as Lender

                                            By:/s/ David V. Fowler
                                               -------------------
                                                Title: Vice President

                                            Address for Notices:

                                            Attn: David Fowler
                                            One Wall Street
                                            New York, New York 10286
                                            Phone (212) 635-8113
                                            Fax (212) 809-9526






                                 SCHEDULE 1.1(a)
                                 ---------------
                               Authorized Officers


I.       Cornerstone Properties Inc. and Corpro Real Estate Management, Inc.:

         John S. Moody           Chairman & Chief Executive Officer

         Rodney C. Dimock        President & Chief Operating Officer

         Kevin P. Mahoney        Senior Vice President & Chief Financial Officer

         Thomas P. Loftus        Chief Administrative Officer & Secretary

         Thomas A. Nye           Vice President

         Scott M. Dalrymple      Vice President

         Peter S. Smichenko      Vice President

         Scott M. Haley          Assistant Vice President

II.      Each limited liability company subsidiary:

         John S. Moody           Chief Operating Manager

         Rodney C. Dimock        President and Manager

         Thomas P. Loftus        Secretry and Manager

         Kevin P. Mahoney        Treasurer and Manager

         Scott M. Dalrymple      Vice President and Manager

         Robert T. Sorrentino    Vice President and Manager

         Peter S. Smichenko      Vice President and Manager

         Scott M. Haley          Assistant Vice President and Manager






                                 SCHEDULE 1.1(b)
                                 ---------------
                               Existing Portfolio


1.       Norwest Center, Minneapolis, Minnesota

2.       Washington Mutual Tower, 1201 Third Avenue, Seattle, Washington

3.       527 Madison Avenue, New York City

4.       125 Summer Street, Boston, Massachusetts

5.       Fee and leasehold interests in One Norwest Center, Denver, Colorado

6.       Tower 56, 126 East 56th Street, New York City

7.       One Lincoln Centre, Oakbrook Terrace, Illinois

8.       Fee and leasehold interest in One Ninety One Peachtree Office Tower,
         Atlanta, Georgia

9.       200 Galleria Parkway, Atlanta, Georgia

10.      11 Canal Center Plaza, Alexandria, Virginia

11.      99 Canal Center Plaza, Alexandria, Virginia

12.      TransPotomac Plaza, Building 5, Alexandria, Virginia

13.      500 Boylston Street, Boston, Massachusetts

14.      222 Berkeley Street, Boston, Massachusetts

15.      Fee and leasehold interest in Charlotte Plaza,Charlotte, North Carolina

16.      Market Square, Washington, D.C.

17.      Note secured by second priority mortgage on fee and leasehold interests
         in Sixty State Street, Boston, Massachusetts

18.      Corporate 500 Centre, Deerfield, Illinois

19.      One Memorial Drive, Cambridge, Massachusetts

20.      201 California Street, San Francisco, California

21.      Wilshire Palisades, 1299 Ocean, Santa Monica, California





                                 SCHEDULE 1.1(c)
                                 ---------------
                             Existing Ground Leases


191 Peachtree Tower, Atlanta, Georgia
- -------------------------------------
         Cross-Lease  and Easement  Agreement made and entered into February 10,
         1988, by and between  Peachtree  Palace Venture ("Hotel Owner") and One
         Ninety One Peachtree Associates ("Office  Developer"),  a short form of
         which is  recorded  as that  certain  Indenture  of  Lease  dated as of
         February 10, 1998,  by and between  Peachtree  Palace  Hotel,  Ltd. and
         Metropolitan Life Insurance Company, d/b/a Peachtree Palace Venture, as
         Lessor, and One Ninety One Peachtree Associates, as Lessee, recorded in
         Deed Book 11321 page 56, Fulton County, Georgia Records.

60 State Street, Boston, Massachusetts
- -------------------------------------
         Cornerstone  owns a second  mortgage  position  on this  property,  the
         collateral for which is the following leasehold interest:

         Lease dated as of December 29, 1967,  notice of which has been recorded
         with  Suffolk  Registry  of Deeds,  Book 8188,  Page 144, as amended by
         instruments  dated June 20,  1968,  January 7, 1971,  July 30, 1975 and
         November 26, 1975,  notices of which amendments have been recorded with
         said Deeds in Book 8209, Page 711, Book 8414, Page 356, Book 8804, Page
         606,  and Book 8836,  Page 448,  respectively,  and as  affected by (x)
         Estoppel  Certificate and Agreement  dated December 28, 1977,  recorded
         with said Deeds in Book 9024,  Page 244; (y) Estoppel  Certificate  and
         Agreement dated December 23, 1988 and Supplemental Estoppel Certificate
         and Agreement  dated  December 23, 1988; and (z) letter dated March 30,
         1990,  by  which  the  Trustees  of  Fifty  State  Street  Trust  under
         Declaration  of Trust dated  December 29, 1967,  and recorded with said
         Deeds in Book 8188,  Page 137, leased the  above-captioned  premises to
         the Trustees of Cabot,  Cabot & Forbes Co.,  whose  interest  under the
         Ground Lease has been assigned (by Assignment and Assumption  Agreement
         dated  September 1, 1977,  recorded with said Deeds in Book 8654,  Page
         448) to the  Trustees of 60 State  Street  Trust under  Declaration  of
         Trust dated September 10, 1970,  recorded with said Deeds in Book 8389,
         Page 286.

One Norwest Center, Denver, Colorado
- ------------------------------------
         Ground lease dated February 5, 1981,  and recorded  February 9, 1981 in
         Book 2322 at Page 182 of the  records of the Clerk and  Recorder of the
         City  and  County  of  Denver,   Colorado,   between  Lincoln  Building
         Corporation, as lessor, and 1700 Lincoln Limited, as lessee, as amended
         and assigned by Lincoln  Building  Corporation to 1700 Lincoln Limited,
         and as assigned by 1700 Lincoln Limited to Cornerstone Denver LLC.

Charlotte Plaza, Charlotte, North Carolina
- ------------------------------------------
         Leasehold  interests in and to the alleyway running between 3rd and 4th
         Streets (i) as  conveyed in the Deed  (Easement)  to  Charlotte  Office
         Tower Associates from  Charlotte-Southern Corporation  dated August 28,
         1981, recorded in Book 4468, Page 856, Mecklenburg Public Registry, and
         (ii)  created  by  that  Sublease  Agreement  from   Charlotte-Southern
         Corporation to Charlotte  Office Tower  Associates dated July 18, 1989,
         recorded in Book 6069, Page 438, Mecklenburg Public Registry.

Galland and Seneca Buildings, Seattle, Washington
- ------------------------------------------------
         Lease dated  February  24, 1985,  by and between  Samis Land Company as
         Lessor  and Wright  Runstad & Company  as Lessee,  as amended by letter
         agreement dated March 6, 1985, as further amended by that certain First
         Amendment to Lease dated June 27, 1985, as assigned by Wright Runstad &
         Company to 1212  Second  Avenue  Limited  Partnership  pursuant to that
         certain  Assignment  of Samis Lease dated  October 8, 1985,  as further
         amended by that  certain  Second  Amendment  to Lease daed  November 3,
         1985, as further amended by that certain Third Amendment to Lease dated
         October  24,  1986,  as  subleased  to Block Six,  which  sublease  was
         conveyed to Third and University Limited  Partnership as security for a
         loan.






                                 SCHEDULE 1.1(d)
                                 ---------------
                     Effective Date Unencumbered Properties
                     --------------------------------------

1.       Fee and leasehold interest in One Ninety One Peachtree Office Tower,
         Atlanta, Georgia

2.       One Memorial Drive, Cambridge, Massachusetts

3.       500 Boylston Street, Boston, Massachusetts

4.       222 Berkeley Street, Boston, Massachusetts

5.       11 Canal Plaza, Alexandria, Virginia

6.       99 Canal Plaza, Alexandria, Virginia


                                  SCHEDULE 5.7

                               Pre-Existing Liens


                        Loan Amount    Maturity
                      As of 9/30/98      Date       Lender
                      -------------    --------     ------ 

One Norwest Center       98,500,000    Oct-08    CIGNA and Mass Mutual

Norwest Center          110,000,000    Dec-05    Norwest Bank

Washington Mutual Tower  79,100,000    Nov-05    Teachers Insurance and Annuity
                                                 Association

125 Summer Street        50,000,000    Jan-03    Northwestern Mutual Life 
                                                 Insurance Company

Tower 56                 17,608,000    May-03    Northwestern Mutual Life 
                                                 Insurance Company

Sixty State Street       88,141,000    Jan-05    Teachers Insurance and Annuity
                                                 Association

Corporate 500 Centre     90,000,000(a) Nov-06    Teachers Insurance and Annuity
                                                 Association

201 California Street    33,171,000    Mar-05    Northwestern Mutual Life
                                                 Insurance Company

Wilshire Palisades       30,109,000    Jul-02    Lincoln National Life Insurance


(a) Loan was refinanced on October 9, 1998.  The loan amount,  maturity date and
lender  reflect  the new  loan.  The  original  loan had a  9/30/98  balance  of
$80,000,000, a maturity date of Jul-02 and was held by Bankers Trust Company.




                                  SCHEDULE 5.8

                            Pre-Existing Indebtedness


                       Loan Amount     Maturity
                      As of 9/30/98      Date       Lender
                      -------------    --------     ------

One Norwest Center       98,500,000      Oct-08  CIGNA and Mass Mutual

Norwest Center          110,000,000      Dec-05  Norwest Bank

Washington Mutual Tower  79,100,000      Nov-05  Teachers Insurance and Annuity
                                                 Association

125 Summer Street        50,000,000      Jan-03  Northwestern Mutual Life
                                                 Insurance Company

Tower 56                 17,608,000      May-03  Northwestern Mutual Life 
                                                 Insurance Company

Sixty State Street       88,141,000      Jan-05  Teachers Insurance and Annuity
                                                 Association

Corporate 500 Centre     90,000,000(a)   Nov-06  Teachers Insurance and Annuity
                                                 Association

201 California Street    33,171,000      Mar-05  Northwestern Mutual Life
                                                 Insurance Company

Wilshire Palisades       30,109,000      Jul-02  Lincoln National Life Insurance

Convertible Promissory   12,926,000      Jan-01  Hines
Note due 2001

TransPotomac Plaza 5     65,000,000      Oct-00  Dutch Institutional Holding
and Charlotte Plaza                              Company

527 Madison Avenue and   65,000,000      Oct-04  Dutch Institutional Holding
One Lincoln Center                               Company

Market Square and 200   120,000,000      Oct-07  PGGM
Galleria


(a) Loan was refinanced on October 9, 1998.  The loan amount,  maturity date and
lender  reflect  the new  loan.  The  original  loan had a  9/30/98  balance  of
$80,000,000, a maturity date of Jul-02 and was held by Bankers Trust Company.




                                  SCHEDULE 5.12
                                  -------------
                                  Subsidiaries

1. 100%   ownership  of  Cornerstone  Denver LLC, a Delaware  limited  liability
company.

2. 100% ownership of Cornerstone  Peachtree  LLC, a Delaware  limited  liability
company which owns an 80% interest in One Ninety One Peachtree Associates.

3. General and limited partner of Cornerstone Properties Limited Partnership,  a
Delaware limited partnership. 

4. 100%  ownership  of CORPRO Real Estate  Management  Inc.,  which is a limited
partner of Cornerstone Limited Partnership.

5. 100%  ownership of Cornerstone 200 Galleria LLC, a Delaware limited liability
company which owns a membership  interest in Galleria Retention Area Associates,
LLC, a Georgia limited liability company which is the fee owner of the retention
pond serving the Galleria area; the  membership  interest in Galleria  Retention
Area  Associates,  LLC is  collectively  held by the several  owners of Galleria
property and therefore individual ownership interests in Galleria Retention Area
Associates, LLC fluctuate as ownership of the Galleria property changes.

6. 100%  ownership of  Cornerstone  Oakbrook LLC, a Delaware  limited  liability
company.

7. 100%  ownership of  Cornerstone  Dearborn LLC, a Delaware  limited  liability
company (former owner of Dearborn land, not yet dissolved).

8. 100%  ownership  of 125 Summer  Street  Cornerstone  LLC, a Delaware  limited
liability company.

9. 100%  ownership of 500 Boylston Cornerstone LLC, a Delaware limited liability
company which owns a 91.5% interest in Five Hundred Boylston West Venture.

10. 100% ownership of 222 Berkeley Cornerstone LLC, a Delaware limited liability
company which owns a 91.5% interest in 222 Berkeley Venture.

11. 100% ownership of Cornerstone  Minneapolis LLC, a Delaware limited liability
company which owns a 50% interest in NWC Limited Partnership.

12. 100% ownership of  Cornerstone  New York LLC, a Delaware  limited  liability
company.

13. 100% ownership of Cornerstone 527 Madison LLC, a Delaware limited  liability
company.

14.  100%  ownership  of  Cornerstone  Charlotte  Plaza LLC, a Delaware  limited
liability company.

15. 100% ownership of  Cornerstone  TransPotomac  Plaza LLC, a Delaware  limited
liability company.

16. 100%  ownership  of  Cornerstone  99 Canal  Center  LLC, a Delaware  limited
liability company.

17. 100%  ownership  of  Cornerstone  11 Canal  Center  LLC, a Delaware  limited
liability company.


18. 100%  ownership of  Cornerstone  Seattle LLC, a Delaware  limited  liability
company which owns a 50% interest in Third and University Limited Partnership.

19.  100%  ownership  of  Cornerstone  Market  Square  LLC, a  Delaware  limited
liability  company  which  owns a 99%  interest  in  Market  Square  Development
Investors,   which,  in  turn,  owns  an  85.7143%  interest  in  Market  Square
Associates,  which,  in turn, owns a 70% interest in Avenue  Associates  Limited
Partnership.

20. 100%  ownership of  ARICO-Denver,  Inc. and of 1700 Lincoln Inc.  which,  in
turn, own all the interests in 1700 Lincoln Limited  Partnership (these entities
have not yet been dissolved and are not currently in good standing, but the real
estate  formerly owned by the  partnership  is now owned by  Cornerstone  Denver
LLC).

21. 100% ownership of Cornerstone  Deerfield LLC, a Delaware  limited  liability
company.

22. 100% ownership of One Memorial Cornerstone LLC, a Delaware limited liability
company.

23. 100% ownership of Cornerstone Wilshire-Cal LLC, a Delaware limited liability
company.

24.  100%  ownership  of 60 State  Street  Cornerstone  LLC, a Delaware  limited
liability company.

25. 100% ownership of Cstone-Pittsburgh Trust, a Maryland business trust (former
owner of the Frick Building, not yet dissolved).

26. 100% ownership of 201 California LLC, a Delaware limited liability company.

27. 100% ownership of 1299 Ocean LLC, a Delaware limited liability company.




                                  SCHEDULE 5.20
                                  -------------

                              Certain ERISA Matters

                                 None to report.



                                  SCHEDULE 5.21
                                  -------------

                          Certain Environmental Matters

A. Matters disclosed in the following environmental reports previously delivered
to Lender:

     1.  Asbestos  Building  Survey  Report,  prepared  by  Carnow,  Conibear  &
     Associates, Ltd., dated August 9, 1993 for 99 Canal Center Plaza; and draft
     report of Phase 1  Environmental  Site  Assessment  dated  August 11,  1997
     prepared by Law Engineering and Environmental  Services,  Inc. for 99 Canal
     Center  Plaza.  

     2.  Asbestos  Building  Survey  Report,  prepared  by  Carnow,  Conibear  &
     Associates, Ltd., dated August 9, 1993 for 11 Canal Center Plaza; and draft
     report of Phase I  Environmental  Site  Assessment  dated  August 11,  1997
     prepared by Law Engineering and Environmental  Services,  Inc. for 11 Canal
     Center Plaza.

     3. Asbestos Survey, prepared by Asbestos Inspection, Inc. dated October 25,
     1993 for TransPotomac Plaza; and draft report of Phase I Environmental Site
     Assessment   dated  August  8,  1997  prepared  by  Law   Engineering   and
     Environmental Services, Inc. for TransPotomac Plaza.

     4. Report of Geotechnical  Evaluation  prepared by Law  Engineering,  dated
     January 26, 1988 and Limited  Environmental Site Assessment Report prepared
     by Law Engineering, daated January 12, 1988 for 191 Peachtree Street Tower.

     5. Environmental Site Evaluation Report prepared by Environmental Resources
     Management, Inc., dated May 20, 1987 for Market Square; and draft report of
     Phase I Environmental  Site Assessment dated August 7, 1997 prepared by Law
     Engineering and Environmental Services, Inc. for Market Square.

     6. Draft report of Phase I Environmental  Site  Assessment  dated August 7,
     1997 prepared by Law Engineering and Environmental  Services,  Inc. for 200
     Galleria Parkway.

     7. Draft report of Phase I Environmental  Site Assessment  dated August 11,
     1997  prepared by Law  Engineering  and  Environmental  Services,  Inc. for
     Charlotte Plaza.

     8.  Report  of  Phase  I  Environmental  Site  Assessment  prepared  by Law
     Environmental  Consultants,  Inc.,  dated  January 31, 1997 for 527 Madison
     Avenue, and title search inquiry (Notice of Violation  regarding  operating
     permit  for  emergency  generator)  prepared  by Baretta  Research  Service
     Corporation dated January 15, 1997.

     9. Phase I Environmental  Site Assessment  prepared by Smith  Environmental
     Technologies Corporation, dated October 23, 1996 for Norwest Center.

     10. Phase I Environmental  Site Assessment  prepared by IVI  Environmental,
     Inc. dated September 24, 1996 for One Lincoln Centre.

     11. Phase I  Environmental  Site Assessment  prepared by ATC  Environmental
     Inc., dated May 13, 1996 for One Norwest Center.

     12. Report for Environmental Site Assessment  prepared by Law Environmental
     Consultants, Inc., dated December 15, 1995 for 125 Summer Street.

     13. Phase I Envoronmental  Site Assessment  prepared by IVI  Environmental,
     Inc., dated February 22, 1995 for Tower 56.

     14.  Report of Phase I  Environmental  Assessment  prepared by ENSR,  dated
     February  1997,  for  Washington  Mutual  Tower,  and  letter  setting  out
     additional  information  regarding the  Washington  Mutual Tower located at
     1201 Third Avenue, Seattle,  Washington,  dated March 11, 1997, prepared by
     ENSR.

     15. Oil and Hazardous Materials Site Evaluation dated 1985, and updated Oil
     and Hazardous  Materials Site Evaluation  dated April 9, 1986,  prepared by
     Haley and Aldrich, Inc., for 500 Boylston Street.

     16.  Oil and  Hazardous  Materials  Site  Evaluation  dated  April 9, 1986,
     prepared by Haley and  Aldrich,  Inc.,  for 222  Berkeley  Street,  and Oil
     Hazardous  Materials Site Evaluation dated April 3, 1989, prepared by Haley
     and Aldrich, Inc.

     17. Phase I Environmental  Site  Assessment  Report prepared by Hygienetics
     Environmental Services, Inc., dated January 12, 1998, for 60 State Street.

     18. Phase I Environmental  Site Assessment  Report prepared by Hygienentics
     Environmental  Services,  Inc.,  dated January 12, 1998,  for Corporate 500
     Centre.

     19. Phase I Environmental  Site  Assessment  Report prepared by Hygienetics
     Environmental Services, Inc., dated April 15, 1998, for One Memorial Drive.

     20. Phase I Environmental  Site  Assessment  Report prepared by Earth Tech,
     Inc., dated February 4, 1998, for 201 California.

     21. Phase I Environmental  Site  Assessment  Report prepared by Earth Tech,
     Inc., dated January 23, 1998, for 1299 Ocean.

B. Cornerstone is aware of the following environmental matter:

     The  United  States  Environmental  Protection  Agency  sent a request  for
     information to Cornerstone's partner and property manager,  Hines, pursuant
     to Section 104 of the Comprehensive  Environmental Response,  Compensation,
     and  Liability  Act and  Section  3007  of the  Resource  Conservation  and
     Recovery Act. The request  relates to the 222 Berkeley  Street  Property in
     Boston,  Massachusetts and its potential  connection to the Beede Waste Oil
     Superfund Site in Plaistow,  New Hampshire.  Hines  assembled the requested
     information and replied to the Environmental Protection Agency on August 6,
     1998. The currently  avaliable  information  indicates  that, in connection
     with the site  development,  Hines arranged to have  petroleum-contaminated
     water  sent to the  Beede  Waste  Oil site.  Because  of the  Comprehensive
     Environmental  Response,   Compensation,  and  Liability  Actss  "petroleum
     exclusion,"  Hines believes that the material it sent to Beede Waste Oil is
     not a "hazardous substance." Therefore, Hines is of the view that it is not
     a  "potentially  responsible  party"  in  connection  with  that  site  and
     requested that EPA remove the 222 Berkeley  Street joint venture from EPA's
     list of potentially  responsible  parties.  Given the preliminary nature of
     the  available   information  and  the  need  for   discussions   with  the
     Environmental  Protection Agency,  however, that assessment could change as
     new information becomes available.




                                SCHEDULE 7.18(a)
                                ----------------

                       Certain Non-Guarantor Subsidiaries1


Cornerstone 200 Galleria LLC, a Delaware limited liability company

Cornerstone Oakbrook LLC, a Delaware limited liability company

Cornerstone Dearborn LLC, a Delaware limited liability company

Cornerstone 527 Madison LLC, a Delaware limited liability company

Cornerstone Charlotte Plaza LLC, a Delaware limited liability company

Cornerstone TransPotomac Plaza LLC, a Delaware limited liability company

Cornerstone Market Square LLC, a Delaware limited liability company



- ----------
1   On the Initial Funding Date, the respective  Subsidiaries to acquire the WWA
Collateral  Properties  known as Janss Court and Seaport Centre will be added to
this Schedule 7.18(a).




                                SCHEDULE 7.18(b)

                            WWA Collateral Properties


120 Montgomery                     429 Santa Monica
                                   700 North Brand
Pruneyard I, II, S.C.              Apple Building
Pruneyard Inn                      Belmont Shores
Pruneyard Place                    Biltmore Lakes
2300 Norris Tech                   Bixby Ranch
4550 Norris Tech                   Centerside II
4600 Norris Tech                   Crossroads
Searise Office Tower               Golden Bear Center
West Wilshire                      One ADP Plaza
Janss Court                        One Corporate Center
Exposition Centre                  One Post
66 Bovet                           Park Plaza
10 Almaden                         Warner Park Center
Embarcadero Place                  Westlake Spectrum
Peninsula Office Park              Westlake Spectrum II
Peninsula Office Park 4            110 Atrium Place
Peninsula Office Park 9            Bayhill 4, 5, 6 & 7
One & Two Gateway                  Island Corporate Center
1300 South El Camino               Seaport Centre
Scottsdale Centre
1600 South Main
188 Embarcadero
2677 North Main
2700 Ygnacio



                                    Exhibit A

                                     LENDERS

Lender1                                                  Commitment Amount
- -------                                                  -----------------
BANKERS TRUST COMPANY                                       $50,000,000
THE CHASE MANHATTAN BANK                                    $50,000,000
NATIONSBANK, N.A.                                           $50,000,000
THE BANK OF NOVA SCOTIA                                     $40,000,000
COMMERZBANK AKTIENGESELLSCHAFT, NEW YORK BRANCH             $40,000,000
CREDIT LYONNAIS, NEW YORK BRANCH                            $40,000,000
PNC BANK, NATIONAL ASSOCIATION                              $40,000,000
AMSOUTH BANK                                                $30,000,000
THE BANK OF NEW YORK                                        $30,000,000
KEY BANK NATIONAL ASSOCIATION                               $30,000,000
U. S. BANK NATIONAL ASSOCIATION                             $30,000,000
CITIZENS BANK OF RHODE ISLAND                               $20,000,000
FIRST AMERICAN BANK TEXAS, SSB                              $20,000,000
MELLON BANK, N.A.                                           $20,000,000
MICHIGAN NATIONAL BANK                                      $20,000,000
SUMMIT BANK                                                 $20,000,000



- ----------
1  Lending Office  indicated  only if  different  than  office  shown for notice
purposes.




                                    EXHIBIT B



                               REVOLVING LOAN NOTE

Lender:                                                       New York, New York
Commitment: $________________                                _________ __, 199__



     FOR  VALUE  RECEIVED,  the  undersigned,  CORNERSTONE  PROPERTIES  INC.,  a
corporation  duly organized and validly  existing under the laws of the State of
Nevada  ("Cornerstone"),  and  CORNERSTONE  PROPERTIES  LIMITED  PARTNERSHIP,  a
Delaware limited partnership  (collectively with Cornerstone,  the "Borrowers"),
hereby jointly and severally  unconditionally promise to pay to the order of the
Lender  stated  above (the  "Lender")  at the office of Bankers  Trust  Company,
located at ____________,  in lawful money of the United States of America and in
immediately  available  funds, on the Maturity Date a principal  amount equal to
the lesser of (a) the Commitment stated above and (b) the aggregate  outstanding
principal  amount  of the  Loans  from  time to time  made by the  Lender to the
Borrowers pursuant to the Credit Agreement as hereinafter defined. The Borrowers
further jointly and severally agree to pay interest in like money at such office
on the unpaid principal amount hereof from time to time outstanding at the rates
and on the dates specified in the Credit Agreement.

     The holder of this Note is authorized  to endorse on the schedules  annexed
hereto  and made a part  hereof  or on a  continuation  thereof  which  shall be
attached  hereto and made a part  hereof the date,  type and amount of each Loan
made pursuant to the Credit Agreement and the date and amount of each payment or
prepayment of principal thereof,  each continuation  thereof, each conversion of
all or a portion  thereof to another  type and, in the case of  Eurodollar  Rate
Loans,  the length of each  Interest  Period  with  respect  thereto.  Each such
endorsement  shall  constitute  prima  facie  evidence  of the  accuracy  of the
information endorsed.  The failure to make any such endorsement shall not affect
the  obligation of Borrowers to repay any Loan in  accordance  with the terms of
the Credit Agreement.

     This Note (a) is one of the Notes  referred  to in the Second  Amended  and
Restated  Revolving  Credit and Guaranty  Agreement dated as of November 3, 1998
(as amended,  supplemented or otherwise  modified from time to time, the "Credit
Agreement"),  among the Borrowers, the Guarantors signatory thereto, the Lenders
signatory  thereto,  Bankers  Trust  Company,  as  Administrative  Agent for the
Lenders,  The Chase  Manhattan Bank, as Syndication  Agent for the Lenders,  and
NationsBank,  N.A., as Documentaion Agent for the Lenders, (b) is subject to the
provisions of the Credit  Agreement and (c) is subject to optional and mandatory
prepayment in whole or in part as provided in the Credit Agreement.

     Upon  the  occurrence  of any one or more of the  Events  of  Default,  all
amounts then remaining  unpaid on this Note shall become,  or may be declared to
be, immediately due and payable, all as provided in the Credit Agreement.

     All parties now and hereafter liable with respect to this Note hereby waive
presentment, demand, protest and all other notices of any kind.

     Unless otherwise defined herein,  terms defined in the Credit Agreement and
used herein shall have the meanings given to them in the Credit Agreement.

     THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED AND INTERPRETED IN ACCORDANCE
WITH, THE LAW OF THE STATE OF NEW YORK.

                                      CORNERSTONE PROPERTIES INC.

                                      By: ______________________________________

                                      Name: ____________________________________

                                      Title: ___________________________________


                                      CORNERSTONE PROPERTIES LIMITED PARTNERSHIP

                                      By: CORNERSTONE PROPERTIES INC.,
                                          Its General Partner

                                          By: __________________________________

                                          Name: ________________________________

                                          Title: _______________________________





                                                                      SCHEDULE 1
                                                          To REVOLVING LOAN NOTE



                  LOANS, CONVERSIONS AND PAYMENTS OF ABR LOANS
           @@
- --------------------------------------------------------------------------------
|      |               |            |  Amount Of ABR  |   Unpaid     |         |
|      |               |  Amount of | Loans Converted |  Principal   |         |
|      | Amount of ABR |  Principal |  To Eurodollar  |  Balance Of  | Notation|
| Date |    Loans      |   Repaid   |   Rate Loans    |  ABR Loans   |  Made By|
- --------------------------------------------------------------------------------
|      |               |            |                 |              |         |
- --------------------------------------------------------------------------------
|      |               |            |                 |              |         |
- --------------------------------------------------------------------------------
|      |               |            |                 |              |         |
- --------------------------------------------------------------------------------
|      |               |            |                 |              |         |
- --------------------------------------------------------------------------------
|      |               |            |                 |              |         |
- --------------------------------------------------------------------------------
|      |               |            |                 |              |         |
- --------------------------------------------------------------------------------
|      |               |            |                 |              |         |
- --------------------------------------------------------------------------------
|      |               |            |                 |              |         |
- --------------------------------------------------------------------------------
|      |               |            |                 |              |         |
- --------------------------------------------------------------------------------
|      |               |            |                 |              |         |
- --------------------------------------------------------------------------------

                  @@




                                                                      SCHEDULE 2
                                                          To REVOLVING LOAN NOTE



                   LOANS AND PAYMENTS OF EURODOLLAR RATE LOANS
           @@
- --------------------------------------------------------------------------------
|      |          |Interest and|         |Amount Of ABR |  Unpaid    |         |
|      |          | Eurodollar |         |    Loans     | Principal  |         |
|      |Amount of | Rate With  |Amount of| Converted to | Balance Of |         |
|      |Eurodollar|  Respect   |Principal|  Eurodollar  | Eurodollar |Notation |
| Date |Rate Loans|  Thereto   | Repaid  |   Rate Loans | Rate Loans | Made By |
- --------------------------------------------------------------------------------
|      |          |            |         |              |            |         |
- --------------------------------------------------------------------------------
|      |          |            |         |              |            |         |
- --------------------------------------------------------------------------------
|      |          |            |         |              |            |         |
- --------------------------------------------------------------------------------
|      |          |            |         |              |            |         |
- --------------------------------------------------------------------------------
|      |          |            |         |              |            |         |
- --------------------------------------------------------------------------------
|      |          |            |         |              |            |         |
- --------------------------------------------------------------------------------
|      |          |            |         |              |            |         |
- --------------------------------------------------------------------------------
|      |          |            |         |              |            |         |
- --------------------------------------------------------------------------------
|      |          |            |         |              |            |         |
- --------------------------------------------------------------------------------
|      |          |            |         |              |            |         |
- --------------------------------------------------------------------------------
                  @@




                                                                       EXHIBIT C

                                  LOAN REQUEST

                                                           ______________, _____

Bankers Trust Company
as Administrative Agent
130 Liberty Street
25th Floor
New York, New York 10006

Attention: Alexander Johnson



      Re: Second Amended and Restated  Revolving Credit and Guaranty  Agreement,
          dated as of November 3, 1998 (as amended or supplemented  from time to
          time, the "Credit Agreement"),  among Cornerstone  Properties Inc. and
          Cornerstone   Properties  Limited  Partnership,   as  Borrowers,   the
          Guarantors signatory thereto,  the Lenders signatory thereto,  Bankers
          Trust  Company,  as  Administrative  Agent for the Lenders,  The Chase
          Manhattan Bank, as Syndication Agent for the Lenders, and NationsBank,
          N.A., as Documentation Agent for the Lenders

Dear Sir or Madam:

     Reference is made to the  above-referenced  Credit  Agreement  (capitalized
terms used herein that are not defined herein shall have the respective meanings
ascribed  thereto in the Credit  Agreement).  [NAME OF  BORROWER]  hereby  gives
irrevocable  notice of its intention to borrow (the  "Borrowing")  the following
amounts under the Credit Agreement as set forth below:

       1.  The Funding Date of the proposed Borrowing is ___________, ____.

       2.  The aggregate amount of the proposed Borrowing is $_______.

       3.  The proposed Borrowing is to be comprised of $_________ of 
           [Eurodollar Rate] [ABR] Loans.

       4.  The duration of the Interest Period for the Loan, if a Eurodollar 
           Rate Loan, shall be ____ months.

     The undersigned hereby certifies that the following  statements are true on
the date hereof, and will be true on the date of the proposed Borrowing,  before
and  after  giving  effect  thereto  and to  the  application  of  the  proceeds
therefrom:

     (a) the representations and warranties contained in Article V of the Credit
Agreement  and in the  other  Facility  Documents  are true and  correct  in all
material  respects as through  made on and as of such date (except to the extent
such  representations  and  warranties  relate to a specific date, in which case
they are true and correct in all material respects as of such date);

     (b) no Default or Event of Default has occurred and is continuing, or would
result from such proposed Borrowing; and

     (c) The proposed Borrowing will not cause the aggregate principal amount of
all  outstanding  Loans  plus the  Letter of Credit  Obligations  to exceed  the
combined Commitments of the Lenders.

     The Borrower  represents  and warrants,  as of the date hereof,  that after
giving effect to the Loans requested above,  all the  requirements  contained in
Section 6.1 of the Credit Agreement are satisfied.

                                               CORNERSTONE PROPERTIES INC.,
                                                 individually or as sole general
                                                 partner of CORNERSTONE
                                                 PROPERTIES LIMITED PARTNERSHIP

                                               By:__________________________
                                                  Name:
                                                  Title:

                                               By:__________________________
                                                  Name:
                                                  Title:






                                                                       EXHIBIT D

                              CONTINUATION REQUEST

                                                             ____________, _____

Bankers Trust Company
as Administrative Agent
130 Liberty Street
25th Floor
New York, New York 10006

Attention: Alexander Johnson

      Re: Second Amended and Restated  Revolving Credit and Guaranty  Agreement,
          dated as of November 3, 1998 (as amended or supplemented  from time to
          time, the "Credit Agreement"),  among Cornerstone  Properties Inc. and
          Cornerstone   Properties  Limited  Partnership,   as  Borrowers,   the
          Guarantors signatory thereto,  the Lenders signatory thereto,  Bankers
          Trust  Company,  as  Administrative  Agent for the Lenders,  The Chase
          Manhattan Bank, as Syndication Agent for the Lenders, and NationsBank,
          N.A., as Documentation Agent for the Lenders

  Dear Sir or Madam:

     Reference is made to the  above-referenced  Credit  Agreement  (capitalized
terms used herein that are not defined herein shall have the respective meanings
ascribed thereto in the Credit Agreement). The undersigned Borrower hereby gives
irrevocable  notice of its intention to continue the Loans or a portion  thereof
for an additional Interest Period under the Credit Agreement as set forth below.

     Please   continue   $___________  of  the  Eurodollar  Rate  Loans  of  the
undersigned,  the Interest Period with respect to which ends on _______________,
(which is not less than three Eurodollar Business Days from the date hereof), as
a Eurodollar Rate Loan with an Interest Period  commencing on and including such
date and ending,  subject to the limitations  applicable to Interest Periods for
Eurodollar  Rate  Loans  as set  forth  in the  definition  of  Interest  Period
contained in the Credit Agreement, on the date that is [one] [two] [three] [six]
[twelve]* months thereafter.

     The undersigned hereby certifies that the following  statements are true on
the date  hereof,  and will be true as of the date any  Eurodollar  Rate Loan is
continued as requested above,  before and after giving effect thereto and to the
application of proceeds therefrom:

     (a) the representations and warranties contained in Article V of the Credit
Agreement  and in the  other  Facility  Documents  are true and  correct  in all
material  respects as through  made on and as of such date (except to the extent
such  representations  and  warranties  relate to a specific date, in which case
they are true and correct in all material respects as of such date);

     (b) no Default or Event of Default has occurred and is continuing, or would
result from such proposed continuation; and

     (c) The proposed continuation will not cause the aggregate principal amount
of all  outstanding  Loans plus the Letter of Credit  Obligations  to exceed the
combined Commitments of the Lenders.

                                               CORNERSTONE PROPERTIES INC.,
                                                 individually or as sole general
                                                 partner of CORNERSTONE
                                                 PROPERTIES LIMITED PARTNERSHIP

                                               By:__________________________
                                                 Name:
                                                 Title:

                                               By:__________________________
                                                 Name:
                                                 Title:




- ---------- 

*  6- or 12-month  Interest Periods may not be requested  without the  unanimous
consent of all Lenders.




                                                                       EXHIBIT E


                            ASSIGNMENT AND ACCEPTANCE


     Reference is made to the Second Amended and Restated  Revolving  Credit and
Guaranty  Agreement,  dated as of November  3, 1998 (as amended or  supplemented
from time to time, the "Credit  Agreement"),  among Cornerstone  Properties Inc.
and Cornerstone  Properties Limited  Partnership,  as Borrowers,  the Guarantors
signatory  thereto,  the Lenders signatory  thereto,  Bankers Trust Company,  as
Administrative  Agent for the Lenders,  The Chase Manhattan Bank, as Syndication
Agent for the Lenders (the  "Synidication  Agent"),  and  NationsBank,  N.A., as
Documentation Agent for the Lenders (together with the Administrative  Agent and
the  Syndication  Agent,  the "Agents").  Capitalized  terms used herein and not
otherwise  defined  herein shall have the respective  meanings  assigned to such
terms by the Credit Agreement.

     ______________  (the "Assignor") and _____________  (the "Assignee") hereby
agree as follows:

     1. The Assignor  hereby  irrevocably  sells,  assigns and  delegates to the
Assignee without recourse to the Assignor, and the Assignee hereby purchases and
assumes from the Assignor,  without  recourse to and without  representation  or
warranty by the Assignor except as otherwise specifically set forth in Section 2
below, a  $_______________*  interest in and to all of the Assignor's rights and
obligations under and in respect of Assignor's Commitment and Loans and its Note
set forth on Schedule I hereto  (the  "Assigned  Loan") and  related  rights and
obligations under the Credit Agreement and other Facility Documents.

     2. The  Assignor  (a) makes no  representation  or warranty  and assumes no
responsibility  with respect to any  statements,  warranties or  representations
made in or in connection with the Credit Agreement,  any other Facility Document
or any other instrument or document furnished pursuant thereto or the execution,
legality,  validity,  enforceability,  genuineness,  sufficiency or value of the
Credit  Agreement,  any  other  Facility  Document  or any other  instrument  or
document  furnished  pursuant  thereto,  other than that it has not  created any
adverse  claim upon the interest  being  assigned by it hereunder  and that such
interest  is  free  and  clear  of  any  such  adverse   claim;   (b)  makes  no
representation  or warranty  and assumes no  responsibility  with respect to the
financial condition of Borrowers or any other Loan Parties or the performance or
observance by Borrowers or any other Loan Parties of their obligations under the
Credit  Agreement  or any other  Facility  Document or any other  instrument  or
document  furnished  pursuant  hereto  or  thereto;  and (c)  attaches  the Note
evidencing the Assigned Loan and requests that the Administrative Agent exchange
such Note for [(i)] a new Note,  dated  _______________,  ____, in the principal
amount of $_______________ payable to the order of the Assignee[, and (ii) a new
Note, dated  _______________  ____, in the principal amount of  $_______________
payable to the order of the Assignor].

     3. The Assignee (a) represents  and warrants that it is legally  authorized
to enter into this Assignment and Acceptance;  (b) confirms that it has received
a copy of the Credit Agreement, together with copies of the financial statements
referenced  therein and such other  documents and  information  as it has deemed
appropriate  to make its own credit  analysis  and  decision  to enter into this
Assignment and Acceptance; (c) acknowledges and agrees that it has made and will
make such  inquiries  and has taken and will take such care on its own behalf as
would have been the case had it made a Loan  directly to the  Borrowers  without
the  intervention  of  the  Assignor,  the  Agents  or  any  other  Person;  (d)
acknowledges  and agrees that it will perform in accordance with their terms all
of the obligations that, by the terms of any Facility Document,  are required to
be  performed  by it as a Lender;  (e) agrees  that it will,  independently  and
without  reliance upon the Assignor,  the Agents or any other Person which is or
has become a Lender and based on such documents and information as it shall deem
appropriate at the time,  continue to make its own credit decisions in taking or
not taking action under the Credit  Agreement;  (f) appoints and  authorizes the
Agents to take such action as agents on its behalf and to  exercise  such powers
under the Credit  Agreement as are delegated to the Agents by the terms thereof,
together with such powers under the Credit Agreement as are incidental  thereto;
(g) agrees that it will be bound by the  provisions of the Credit  Agreement and
will perform in accordance with its terms all the obligations which by the terms
of  the  Credit  Agreement  are  required  to be  performed  by  it as a  Lender
including,  if it is  organized  under the laws of a  jurisdiction  outside  the
United States, its obligation pursuant to Section 3.3(f) of the Credit Agreement
to deliver the forms  prescribed by the Internal  Revenue  Service of the United
States certifying as to the Assignee's  exemption from United States withholding
taxes with respect to all  payments to be made to the Assignee  under the Credit
Agreement,  or such other  documents as are  necessary to indicate that all such
payments are subject to such tax at a rate reduced by an applicable  tax treaty;
(h) confirms that the Assignee is an "Eligible  Assignee" under the terms of the
Credit Agreement;  (i) acknowledges and agrees that neither the Assignor nor the
Agents makes any representation or warranty or assumes any  responsibility  with
respect  to  any  statements,  warranties  or  representations  made  in  or  in
connection  with any  Facility  Document  or any other  instrument  or  document
furnished pursuant thereto or the authorization,  execution, legality, validity,
enforceability,  genuineness,  sufficiency or value of any Facility  Document or
any  other  instrument  or  document   furnished   pursuant  thereto;   and  (j)
acknowledges  and agrees that  neither  the  Assignor  nor the Agents  makes any
representation  or warranty or assumes any  responsibility  with  respect to the
financial  condition or creditworthiness of the Loan Parties or any other Person
or the  performance or observance by the Loan Parties or any other Person of any
obligations  under any  Facility  Document or any other  instrument  or document
furnished pursuant thereto.

     4.  The  effective  date  for  this  Assignment  and  Acceptance  shall  be
________________  ____ (the "Effective  Date")** Following the execution of this
Assignment and Acceptance by the Assignor and the Assignee, it will be delivered
to the Administrative Agent for acceptance by the Administrative Agent[, and the
Assignor  or the  Assignee  shall  pay  to the  Administrative  Agent  a  $3,000
assignment fee].  Following such payment,  and acceptance by the  Administrative
Agent of this  Assignment  and  Acceptance,  a photostatic  copy hereof shall be
delivered  to the  Borrowers  and the  Administrative  Agent.  Within  five  (5)
Business  Days  after the  Borrowers'  receipt  of such  photostatic  copy,  the
Borrowers shall execute and deliver to the Administrative  Agent the new Note or
Notes to be held in  escrow  pending  release  of the  Note (in the  appropriate
outstanding principal amount) evidencing the Assigned Loan to the Borrowers. The
Administrative  Agent  shall  deliver  the new  Note or  Notes  to the  payee(s)
thereof,  shall mark the Note  evidencing  the Assigned Loan as  "replaced"  and
shall deliver the same to the Borrowers.

     5. Upon such  acceptance by the  Administrative  Agent, as of the Effective
Date,
          
     (a) From and after the Effective Date, (a) the Assignee shall be a party to
the  Credit  Agreement  and,  to the  extent  provided  in this  Assignment  and
Acceptance, have the rights and obligations of a Lender thereunder and under the
other Facility Documents and shall be bound by the provisions thereof, and

     The Assignee, in addition to any rights, benefits and obligations under the
Facility  Documents held by it immediately  prior to the Effective  Date,  shall
have the  rights,  benefits  and  obligations  of a Lender  under  the  Facility
Documents  that  have  been  assigned  to it  (including,  but not  limited  to,
obligations  to the  Borrowers  under the Facility  Documents)  pursuant to this
Assignment and  Acceptance.  The Assignee shall become a Lender for all purposes
of the Credit Agreement and the other Facility  Documents,  and execution hereof
shall be deemed to be execution of the Credit Agreement; and

     (b) The Assignor, to the extent provided in this Assignment and Acceptance,
shall  relinquish  its rights  (except as provided in the Credit  Agreement) and
benefits and be released from its obligations  under the Credit  Agreement (and,
in the  case of an  assignment  covering  all or the  remaining  portion  of the
Assignor's rights,  benefits and obligations under the Facility  Documents,  the
Assignor  shall cease to be a Lender  under the  Facility  Documents,  except as
provided in the Credit Agreement).

     6. Upon such  acceptance by the  Administrative  Agent,  from and after the
Effective  Date, the  Administrative  Agent shall make payments under the Credit
Agreement in respect of the Assigned Loan (including,  without  limitation,  all
payments of principal, interest and fees with respect thereto) to the Assignee ,
whether  such  amounts  have  accrued  prior  to the  Effective  Date or  accrue
subsequent to the Effective  Date. The Assignor and the Assignee agree that they
shall make all appropriate adjustments in payments under the Credit Agreement by
the  Administrative  Agent for  periods  prior to the  Effective  Date  directly
between themselves.

     7. The  Assignor  agrees  to give  written  notice of this  Assignment  and
Acceptance to the Agents,  each Lender and the  Borrowers,  which written notice
shall  include  the  addresses  and  related  information  with  respect  to the
Assignee.

     8. THIS  ASSIGNMENT  AND  ACCEPTANCE  SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK, INCLUDING, WITHOUT LIMITATION,
SECTION 5-1401 OF THE GENERAL OBLIGATIONS LAW.

     9. EACH OF THE  ASSIGNOR  AND THE  ASSIGNEE  HEREBY  WAIVES  (TO THE EXTENT
PERMITTED  BY LAW) THE RIGHT TO A TRIAL BY JURY IN ANY  LITIGATION  IN ANY COURT
WITH  RESPECT TO, IN  CONNECTION  WITH,  OR ARISING OUT OF THIS  ASSIGNMENT  AND
ACCEPTANCE, ANY INSTRUMENT OR DOCUMENT DELIVERED PURSUANT TO THIS ASSIGNMENT AND
ACCEPTANCE, OR THE VALIDITY, INTERPRETATION, OR ENFORCEMENT THEREOF.


     IN WITNESS  WHEREOF,  the  undersigned  have  caused  this  Assignment  and
Acceptance  to be duly  executed  and  delivered  by their  respective  officers
thereunto duly authorized as of the date and year first above written.

[NAME OF ASSIGNOR]                [NAME OF ASSIGNEE]

By: _____________________         By: __________________

Title: __________________         Title: _______________



Accepted this ______ day of
_______________, ______

BANKERS TRUST COMPANY,
  as Administrative Agent

By: _______________________

Title: ____________________




- ---------
* The minimum amount that may be assigned is equal to the lesser of (i) $_______
or (ii) the  Commitment of the Assignor as  determined  in  accordance  with the
Credit Agreement.

** The  requested  effective  date must be at least five Business Days after the
execution of this Assignment and Acceptance.




                                                                       EXHIBIT G

                            LETTER OF CREDIT REQUEST

No. (1)                                                    ______________, _____

Bankers Trust Company
as Administrative Agent
130 Liberty Street
25th Floor
New York, New York 10006

Attention: Alexander Johnson

[Name and address of Issuing Bank]


      Re: Second Amended and Restated  Revolving Credit and Guaranty  Agreement,
          dated as of November 3, 1998 (as amended or supplemented  from time to
          time, the "Credit Agreement"),  among Cornerstone  Properties Inc. and
          Cornerstone   Properties  Limited  Partnership,   as  Borrowers,   the
          Guarantors signatory thereto,  the Lenders signatory thereto,  Bankers
          Trust  Company,  as  Administrative  Agent for the Lenders,  The Chase
          Manhattan Bank, as Syndication Agent for the Lenders, and NationsBank,
          N.A., as Documentation Agent for the Lenders

Dear Sir or Madam:

     Reference is made to the  above-referenced  Credit  Agreement  (capitalized
terms used herein that are not defined herein shall have the respective meanings
ascribed thereto in the Credit Agreement).

     The  undersigned  Borrower  hereby requests that [name of Issuing Bank], in
its individual capacity, issue a standby Letter of Credit for the account of the
undersigned on ________________,  ____ (the "Date of Issuance") in the aggregate
stated amount of $____________.
                  
     The beneficiary of the requested Letter of Credit will be  ________________
[name  of  beneficiary],  and  such  Letter  of  Credit  will be in  support  of
_______(2)_______ and will have a stated expiration date of _______(3)_______.

     The undersigned hereby certifies that the following  statements are true on
the date  hereof,  and will be true on the Date of  Issuance,  before  and after
giving effect to the issuance of the Letter of Credit:

     (a) the representations and warranties contained in Article V of the Credit
Agreement  and in the  other  Facility  Documents  are true and  correct  in all
material  respects as through  made on and as of such date (except to the extent
such  representations  and  warranties  relate to a specific date, in which case
they are true and correct in all material respects as of such date);

     (b) no Default or Event of Default has occurred and is continuing, or would
result from the issuance of the proposed Letter of Credit; and

     (c) The proposed  Letter of Credit will not cause the  aggregate  principal
amount of all outstanding Loans plus the Letter of Credit  Obligations to exceed
the combined Commitments of the Lenders.

     The undersigned  Borrower  represents and warrants,  as of the date hereof,
that  after  giving  effect to the  Letter of Credit  requested  above,  all the
requirements contained in Section 6.1 of the Credit Agreement are satisfied.

                                               CORNERSTONE PROPERTIES INC.,
                                                individually and as sole general
                                                partner of CORNERSTONE 
                                                PROPERTIES LIMITED PARTNERSHIP

                                               By:__________________________
                                                 Name:
                                                 Title:

                                               By:__________________________
                                                 Name:
                                                 Title:


_______________________

(1) Letter of Credit Request Number

(2) Describe  Indebtedness,  if any,  supported by Letter of Credit and describe
obligation  to which it relates  

(3) Insert last date upon which drafts may be presented,  which may not be later
than the Maturity Date.




                                                                       EXHIBIT H

                             COMPLIANCE CERTIFICATE

                                                             ____________, 19___


Bankers Trust Company
as Administrative Agent
130 Liberty Street
25th Floor
New York, New York 10006

Attention: Alexander Johnson

      Re: Second Amended and Restated  Revolving Credit and Guaranty  Agreement,
          dated as of November 3, 1998 (as amended or supplemented  from time to
          time, the "Credit Agreement"),  among Cornerstone  Properties Inc. and
          Cornerstone   Properties  Limited  Partnership,   as  Borrowers,   the
          Guarantors signatory thereto,  the Lenders signatory thereto,  Bankers
          Trust  Company,  as  Administrative  Agent for the Lenders,  The Chase
          Manhattan Bank, as Syndication Agent for the Lenders, and NationsBank,
          N.A., as Documentation Agent for the Lenders

  Dear Sir or Madam:

     Reference is made to the  above-referenced  Credit  Agreement  (capitalized
terms used herein that are not defined herein shall have the respective meanings
ascribed thereto in the Credit Agreement).

     Pursuant to Section 7.1(c) of the Credit Agreement, the undersigned, in his
capacity as _______________ of Cornerstone, hereby certifies that:

     (i) During  the period  covered by the  attached  financial  statements,  a
review of the activities of the Borrowers and their  Subsidiaries  has been made
under my  immediate  supervision  with a view to  determining  whether  the Loan
Parties have observed,  performed and fulfilled all of their  obligations  under
the Credit Agreement and the other Facility Documents;

     (ii) As of the date hereof, no Default or Event of Default exists [, except
as described below].
                  
     [Describe Defaults and Events of Default]

     (iii) We are  presently  taking the  following  actions with respect to the
above-described Events of Default and Defaults:

     (iv) The calculations with respect to the financial  covenants set forth in
Article  VIII of the Credit  Agreement  for the period  covered by the  attached
financial statements are as follows:

          (a) Equity Value (Section 8.5):

          (b) Leverage Ratio (Section 8.6):

          (c) Interest Coverage Ratio (Section 8.7):

          (d) Fixed Charge Coverage Ratio (Section 8.8):

          (e) Unencumbered Properties Asset Value (Section 8.9):

          (f) Unencumbered Properties/unsecured Indebtedness (Section 8.10(i)):

          (g) Total Property Asset Value/secured Indebtedness(Section 8.10(ii)):

          (h) Combined Adjusted NOI (Wholly-Owned Unleveraged Properties/
          Unsecured Interest Expense (Section 8.10(iii)):

          (i) Construction in Process/Total Property Asset Value (Section 
          8.10(iv)):

          (j) Mortgages/Total Property Asset Value (Section 8.10(v)):

          (k) Non-Class A Properties/ Total Property Asset Value (Section 
          8.10(vi)):

                                               CORNERSTONE PROPERTIES INC.,
                                                individually and as sole general
                                                partner of CORNERSTONE
                                                PROPERTIES LIMITED PARTNERSHIP

                                               By:__________________________
                                                 Name:
                                                 Title:

                                               By:__________________________
                                                 Name:
                                                 Title:




                                                                       EXHIBIT I

                                PLEDGE AGREEMENT

     PLEDGE  AGREEMENT,  dated as of  ____________,  1998,  made by  CORNERSTONE
PROPERTIES LIMITED PARTNERSHIP,  a Delaware limited partnership (the "Pledgor"),
in favor of BANKERS TRUST COMPANY,  as  Administrative  Agent (in such capacity,
the  "Administrative  Agent"),  for the Lenders from time to time parties to the
Second Amended and Restated Revolving Credit and Guaranty Agreement, dated as of
November  3, 1998 (as  amended or  supplemented  from time to time,  the "Credit
Agreement"),  among Cornerstone  Properties Inc. and the Pledgor,  as Borrowers,
the guarantors signatory thereto,  the Lenders signatory thereto,  Bankers Trust
Company, as Administrative  Agent for the Lenders,  The Chase Manhattan Bank, as
Syndication Agent for the Lenders, and NationsBank, N.A., as Documentation Agent
for the Lenders.

                              W I T N E S S E T H:

     WHEREAS,  pursuant  to the Credit  Agreement,  the Lenders  have  severally
agreed to make the Loans to the  Borrowers  and  cause  Letters  of Credit to be
issued  for the  account  of the  Borrowers  upon the terms and  subject  to the
conditions  set  forth  therein,  to be  evidenced  by the  Notes  issued by the
Borrowers under the Credit Agreement;

     WHEREAS, Pledgor is the legal and beneficial owner of the shares of Pledged
Interests  (as  hereinafter  defined)  issued  by  the  Issuer  (as  hereinafter
defined); and

     WHEREAS,  it is a condition  precedent to the  obligation of the Lenders to
make their  respective  Loans to the Borrowers and cause Letters of Credit to be
issued for the account of the Borrowers under the Credit  Agreement that Pledgor
shall have executed and delivered  this Pledge  Agreement to the  Administrative
Agent for the ratable benefit of each Lender;

     NOW, THEREFORE,  in consideration of the premises and to induce the Lenders
to enter into the Credit  Agreement  and to induce the Lenders to make the Loans
and cause  Letters of Credit to be issued  under the Credit  Agreement,  Pledgor
hereby  agrees with the  Administrative  Agent,  for the ratable  benefit of the
Lenders, as follows:

     1. Defined Terms. (a) Unless otherwise defined herein, terms defined in the
Credit  Agreement  and used herein shall have the meanings  given to them in the
Credit Agreement.
     (b) The following terms shall have the following meanings:

     "Agreement": this Pledge Agreement, as the same may be amended, modified or
otherwise supplemented from time to time.

     "Code":  the  Uniform  Commercial  Code  from time to time in effect in the
State of New York.
                  
     "Collateral": the Pledged Interests and all Proceeds.

     "Collateral  Account":  any  account  established  to hold money  Proceeds,
maintained  under the sole  dominion  and control of the  Administrative  Agent,
subject to withdrawal by the Administrative Agent only as provided in subsection
8(a).

     "Issuer":  the  company  identified  on  Schedule 1 attached  hereto as the
issuer of the Pledged  Interests,  which Issuer shall be the Designated  Pledged
Subsidiary.

     "Obligations":  the  collective  reference  to the unpaid  principal of and
interest on the Loans and all other  obligations  and  liabilities of Pledgor to
the Lenders and the Agents,  if any  (including,  without  limitation,  interest
accruing at the then applicable rate provided in the Credit  Agreement after the
maturity of the Loans and interest accruing at the then applicable rate provided
in the Credit  Agreement after the filing of any petition in bankruptcy,  or the
commencement of any insolvency,  reorganization or like proceeding,  relating to
Pledgor,  whether or not a claim for  post-filing or  post-petition  interest is
allowed in such proceeding), whether direct or indirect, absolute or contingent,
due or to become due, or now  existing or  hereafter  incurred,  which may arise
under,  out of, or in connection  with, the Loans,  the Credit  Agreement,  this
Agreement, the other Facility Documents or any other document made, delivered or
given in  connection  therewith,  in each case whether on account of  principal,
interest,  reimbursement  obligations,  fees,  indemnities,  costs,  expenses or
otherwise (including,  without limitation, all fees and disbursements of counsel
to the Agents or to the Lenders that are required to be paid by Pledgor pursuant
to the terms of the Credit  Agreement or this  Agreement  or any other  Facility
Document).

     "Pledged  Interests":  the equity  interests  listed on  Schedule 1 hereto,
together with all certificates,  options or rights of any nature whatsoever that
may be issued or granted  by the  Issuer to  Pledgor  in respect of the  Pledged
Interests while this Agreement is in effect.

     "Proceeds":  all "proceeds" as such term is defined in Section  9-306(1) of
the  Uniform  Commercial  Code in  effect  in the  State of New York on the date
hereof and, in any event, shall include,  without  limitation,  all dividends or
other income from the Pledged  Interests,  collections  thereon or distributions
with respect thereto.

     (c) The words  "hereof,"  "herein"  and  "hereunder"  and words of  similar
import when used in this Agreement  shall refer to this Agreement as a whole and
not to any particular  provision of this  Agreement,  and section and subsection
references are to this Agreement  unless otherwise  specified.  

     (d) The meanings given to terms defined herein shall be equally  applicable
to both the  singular  and  plural  forms of such  terms.  

     2.  Pledge;  Grant of Security  Interest.  Pledgor  hereby  delivers to the
Administrative  Agent,  for the ratable benefit of the Lenders,  all the Pledged
Interests and grants to the Administrative Agent, for the ratable benefit of the
Lenders, a first security interest in the Collateral, as collateral security for
the prompt and complete  payment and performance when due (whether at the stated
maturity, by acceleration or otherwise) of the Obligations.

     3. Stock Powers. Concurrently with the delivery to the Administrative Agent
of each  certificate,  if any,  representing  Pledged  Interests,  Pledgor shall
deliver undated stock powers covering such  certificate,  duly executed in blank
by Pledgor with, if the Administrative Agent so requests, signature guaranteed.

     4. Representations and Warranties. Pledgor represents and warrants that:

     (a)All of the Pledged  Interests  have been duly and validly issued and are
fully paid and nonassessable. 

     (b)  Pledgor  is the  record  and  beneficial  owner  of,  and has good and
marketable title to, the Pledged Interests, free of any and all Liens or options
in favor of, or claims  of,  any other  Person,  except  the  security  interest
created by this Agreement.  

     (c)  The  security  interests  granted  pursuant  to  this  Agreement  upon
completion of the filings and other actions  specified on Schedule 2 (which,  in
the case of all filings and other documents  referred to on said Schedule,  have
been delivered to the Administrative  Agent in completed and duly executed form)
will constitute valid perfected  security  interests in all of the Collateral in
favor of the  Administrative  Agent, for the ratable benefit of the Lenders,  as
collateral  security  for the  Obligations,  prior  to all  other  Liens  on the
Collateral in existence on the date hereof and  enforceable  in accordance  with
the terms hereof against all creditors of Pledgor and any Persons  purporting to
purchase  any  Collateral  from  Pledgor  subject to the effects of  bankruptcy,
insolvency, fraudulent conveyance, reorganization,  moratorium and other similar
laws relating to or affecting  creditors'  rights  generally,  general equitable
principles  (whether  considered  in a  proceeding  in  equity or at law) and an
implied covenant of good faith and fair dealing.

     5. Covenants.  Pledgor covenants and agrees with the Administrative  Agent,
for the ratable  benefit of the Lenders,  that,  from and after the date of this
Agreement until this Agreement is terminated and the security  interests created
hereby are released:  

     (a) If  Pledgor  shall,  as a  result  of  its  ownership  of  the  Pledged
Interests,   become  entitled  to  receive  or  shall  receive  any  certificate
(including,  without limitation,  any certificate representing a distribution in
connection  with any  reclassification,  increase or reduction of capital or any
certificate  issued in connection  with any  reorganization),  option or rights,
whether in addition to, in  substitution  of, as a conversion of, or in exchange
for, any of the Pledged  Interests,  or otherwise  in respect  thereof,  Pledgor
shall accept the same as the agent of the Administrative  Agent, for the ratable
benefit of the Lenders, hold the same in trust for the Administrative Agent, for
the  ratable  benefit of the  Lenders,  and deliver  the same  forthwith  to the
Administrative Agent in the exact form received, duly indorsed by Pledgor to the
Administrative  Agent,  for the ratable  benefit of the  Lenders,  if  required,
together with undated stock powers  covering such  certificate  duly executed in
blank by Pledgor and with, if the  Administrative  Agent so requests,  signature
guaranteed,  to be held by the Administrative  Agent, for the ratable benefit of
the Lenders,  subject to the terms hereof, as additional collateral security for
the Obligations.  Any sums paid upon or in respect of the Pledged Interests upon
the  liquidation  or  dissolution  of the  Issuer  shall  be  paid  over  to the
Administrative  Agent, for the ratable benefit of the Lenders,  to be held by it
hereunder as additional collateral security for the Obligations, and in case any
distribution of capital shall be made on or in respect of the Pledged  Interests
or any  property  shall  be  distributed  upon or with  respect  to the  Pledged
Interests pursuant to the recapitalization or reclassification of the capital of
the  Issuer  or  pursuant  to  the  reorganization   thereof,  the  property  so
distributed  shall be delivered  to the  Administrative  Agent,  for the ratable
benefit of the  Lenders,  to be held by it hereunder  as  additional  collateral
security  for the  Obligations.  If any  sums of money  or  property  so paid or
distributed  in respect of the Pledged  Interests  shall be received by Pledgor,
Pledgor  shall,  until  such  money  or  property  is paid or  delivered  to the
Administrative   Agent,   hold  such  money  or   property   in  trust  for  the
Administrative  Agent,  for the ratable benefit of the Lenders,  segregated from
other funds of Pledgor,  as additional  collateral security for the Obligations.

     (b) Without the prior  written  consent of each  Lender,  Pledgor  will not
sell, assign,  transfer,  exchange, or otherwise dispose of, or grant any option
with  respect to, any of the  Collateral,  create,  incur or permit to exist any
Lien or option in favor of, or any claim of any Person  with  respect to, any of
the  Collateral,  or any interest  therein,  except for the  security  interests
created  by  this  Agreement,   or  enter  into  any  agreement  or  undertaking
restricting the right or ability of Pledgor or the Administrative Agent to sell,
assign or transfer any of the Collateral.

     (c) Pledgor shall maintain the security  interest created by this Agreement
as a first,  perfected security interest and shall defend such security interest
against the claims and demands of all Persons  whomsoever.  At any time and from
time to time, upon the written request of the Required Lenders,  and at the sole
expense of Pledgor,  Pledgor  will  promptly  and duly  execute and deliver such
further  instruments and documents and take such further actions as the Required
Lenders may  reasonably  request for the purposes of obtaining or preserving the
full benefits of this Agreement and of the rights and powers herein granted.  If
any amount payable under or in connection with any of the Collateral shall be or
become evidenced by any promissory note, other instrument or chattel paper, such
note,  instrument  or  chattel  paper  shall  be  immediately  delivered  to the
Administrative Agent, for the ratable benefit of the Lenders, duly endorsed in a
manner  satisfactory  to the  Administrative  Agent,  to be held  as  Collateral
pursuant to this Agreement.  

     (d) Pledgor shall pay, and save the Administrative Agent harmless from, any
and all liabilities with respect to, or resulting from any delay in paying,  any
and all stamp,  excise,  sales or other taxes which may be payable or determined
to be payable with respect to any of the Collateral or in connection with any of
the  transactions  contemplated  by this  Agreement.  

     6. Cash  Dividends and Loan  Payments;  Voting  Rights.  Unless an Event of
Default shall have occurred and be continuing and the Administrative Agent shall
have given notice to Pledgor of the  Administrative  Agent's  intent to exercise
its  corresponding  rights  pursuant to Section 7, Pledgor shall be permitted to
receive  all cash  distributions  (including,  without  limitation,  payments of
interest and principal on loan  advances)  paid in the normal course of business
of the Issuer,  in respect of the Pledged  Interests  and to exercise all voting
rights with respect to the Pledged Interests;  provided,  however,  that no vote
shall  be  cast  or  right  exercised  or  other  action  taken  which,  in  the
Administrative Agent's reasonable judgment, would impair the Collateral or which
would be  inconsistent  with or result in any  violation of any provision of the
Credit Agreement, this Agreement or any other Facility Document.

     7.  Rights of the Secured  Party.  (a) All money  Proceeds  received by the
Administrative  Agent hereunder shall be held by the  Administrative  Agent in a
Collateral  Account.  All Proceeds while held by the  Administrative  Agent in a
Collateral Account (or by Pledgor in trust for the Administrative Agent, for the
ratable benefit of the Lenders) shall continue to be held as collateral security
for all the Obligations  and shall not constitute  payment thereof until applied
as provided in subsection 8(a).

     (b)  If an  Event  of  Default  shall  occur  and  be  continuing  and  the
Administrative  Agent shall give notice of its intent to exercise such rights to
the Pledgor,  the  Administrative  Agent shall have the right to receive any and
all  cash  distributions  paid in  respect  of the  Pledged  Interests  and make
application thereof to the Obligations in such order as the Administrative Agent
may determine,  and all of the Pledged  Interests  shall,  subject to compliance
with the corporate organizational documents applicable to the Pledged Interests,
be registered in the name of the  Administrative  Agent or its nominee,  and the
Administrative  Agent  or its  nominee  may,  subject  to  compliance  with  the
corporate   organizational   documents  applicable  to  the  Pledged  Interests,
thereafter  exercise  all voting and other  rights  pertaining  to such  Pledged
Interests at any meeting of partners of the Issuer or otherwise  and any and all
rights of conversion, exchange, subscription and any other rights, privileges or
options  pertaining to such Pledged  Interests as if it were the absolute  owner
thereof (including,  without limitation, the right to exchange at its discretion
any  and  all  of  the  Pledged   Interests  upon  the  merger,   consolidation,
reorganization,  recapitalization  or other fundamental  change in the corporate
structure  of the Issuer or upon the  exercise by Pledgor or the  Administrative
Agent of any right, privilege or option pertaining to such shares of the Pledged
Interests, and in connection therewith, the right to deposit and deliver any and
all of the Pledged  Interests with any committee,  depositary,  transfer  agent,
registrar  or other  designated  agency  upon such terms and  conditions  as the
Administrative Agent may determine), all without liability except to account for
property  actually  received by it, but the  Administrative  Agent shall have no
duty to Pledgor to exercise any such right, privilege or option and shall not be
responsible for any failure to do so or delay in so doing.  

     8.  Remedies.  (a) If an  Event  of  Default  shall  have  occurred  and be
continuing,   at  any  time  at  the   Administrative   Agent's  election,   the
Administrative  Agent  may  apply  all or  any  part  of  Proceeds  held  in any
Collateral  Account  in  payment  of  the  Obligations  in  such  order  as  the
Administrative Agent may elect.

     (b) If an Event of  Default  shall have  occurred  and be  continuing,  the
Administrative Agent, on behalf of the Lenders, may exercise, in addition to all
other rights and remedies  granted in this Agreement and in any other instrument
or agreement securing, evidencing or relating to the Obligations, all rights and
remedies of a secured party under the Code.  Without  limiting the generality of
the foregoing,  the Administrative Agent, without demand of performance or other
demand,  presentment,  protest,  advertisement or notice of any kind (except any
notice required by law referred to below) to or upon Pledgor or any other Person
(all and each of which demands, defenses,  advertisements and notices are hereby
waived), may in such circumstances forthwith collect,  receive,  appropriate and
realize upon the  Collateral,  or any part thereof,  and/or may forthwith  sell,
assign,  give option or options to purchase or otherwise  dispose of and deliver
the Collateral or any part thereof (or contract to do any of the foregoing),  in
one or more parcels at public or private sale or sales, in the  over-the-counter
market, at any exchange, broker's board or office of the Administrative Agent or
elsewhere  upon such terms and  conditions as it may deem  advisable and at such
prices as it may deem best, for cash or on credit or for future delivery without
assumption of any credit risk. The Administrative Agent or any Lender shall have
the right upon any such public sale or sales,  and, to the extent  permitted  by
law,  upon any such private sale or sales,  to purchase the whole or any part of
the  Collateral  so sold,  free of any  right or  equity  of  redemption  in the
Pledgor, which right or equity is hereby waived and released. The Administrative
Agent shall apply any Proceeds  from time to time held by it and the proceeds of
any such  collection,  recovery,  receipt,  appropriation,  realization or sale,
after  deducting  all  reasonable  costs and expenses of every kind  incurred in
respect  thereof  or  incidental  to  the  care  or  safekeeping  of  any of the
Collateral  or in any  way  relating  to the  Collateral  or the  rights  of the
Administrative Agent and the Lenders hereunder,  including,  without limitation,
reasonable  attorneys' fees and  disbursements of counsel to the  Administrative
Agent, to the payment in whole or in part of the  Obligations,  in such order as
the  Administrative  Agent may elect,  and only after such application and after
the  payment by the  Administrative  Agent of any other  amount  required by any
provision of law,  including,  without  limitation,  Section  9-504(l)(c) of the
Code,  need the  Administrative  Agent  account for the surplus,  if any, to the
Pledgor.  To the extent  permitted by applicable law, Pledgor waives all claims,
damages  and  demands it may acquire  against  the  Administrative  Agent or any
Lender  arising  out of the  exercise  by them of any rights  hereunder.  If any
notice of a proposed sale or other  disposition of Collateral  shall be required
by law, such notice shall be deemed  reasonable  and proper if given at least 10
days before such sale or other disposition.  Pledgor shall remain liable for any
deficiency if the proceeds of any sale or other  disposition  of Collateral  are
insufficient  to pay the  Obligations  and the  fees  and  disbursements  of any
attorneys  employed by the  Administrative  Agent or any Lender to collect  such
deficiency.

     9.  Registration  Rights;  Private Sales.  (a) Pledgor  recognizes that the
Administrative  Agent may be  unable  to effect a public  sale of any or all the
Pledged Interests, by reason of certain prohibitions contained in the Securities
Act and applicable state  securities laws or otherwise,  and may be compelled to
resort to one or more private sales thereof to a restricted  group of purchasers
which will be obliged to agree,  among other things,  to acquire such securities
for their own account for investment and not with a view to the  distribution or
resale thereof.  Pledgor  acknowledges and agrees that any such private sale may
result in prices and other terms less  favorable than if such sale were a public
sale and, notwithstanding such circumstances,  agrees that any such private sale
shall be  deemed  to have been made in a  commercially  reasonable  manner.  The
Administrative  Agent shall be under no obligation to delay a sale of any of the
Pledged  Interests for the period of time necessary to permit the Issuer thereof
to register such  securities for public sale under the Securities  Act, or under
applicable state securities laws, even if the Issuer would agree to do so.

     (b)  Pledgor  further  agrees to use its best  efforts to do or cause to be
done all such other acts as may be  necessary  to make such sale or sales of all
or any  portion of the Pledged  Interests  pursuant  to this  Section  valid and
binding and in compliance with any and all other applicable Legal  Requirements.
Pledgor  further agrees that a breach of any of the covenants  contained in this
Section will cause  irreparable  injury to the Agents and the Lenders,  that the
Agents and the Lenders have no adequate  remedy at law in respect of such breach
and, as a consequence,  that each and every  covenant  contained in this Section
shall be specifically enforceable against the Pledgor, and Pledgor hereby waives
and agrees not to assert any defenses against an action for specific performance
of such  covenants  except for a defense  that no Event of Default has  occurred
under the Credit  Agreement.  

     10.  Irrevocable  Authorization  and Instruction to Issuer.  Pledgor hereby
authorizes and instructs the Issuer to comply with any  instruction  received by
it from the  Administrative  Agent in writing  that (a) states  that an Event of
Default has occurred and (b) is otherwise in  accordance  with the terms of this
Agreement,  without  any other or further  instructions  from the  Pledgor,  and
Pledgor agrees that the Issuer shall be fully protected in so complying.

     11. Agent's Appointment as Attorney-in-Fact. (a) Pledgor hereby irrevocably
constitutes  and appoints the  Administrative  Agent and any officer or agent of
the  Administrative  Agent,  with full  power of  substitution,  as its true and
lawful  attorney-in-fact  with full irrevocable power and authority in the place
and stead of Pledgor and in the name of Pledgor or in the Administrative Agent's
own name, from time to time in the Administrative  Agent's  discretion,  for the
purpose  of  carrying  out the  terms  of this  Agreement,  to take  any and all
appropriate  action and to execute any and all documents and  instruments  which
may be  necessary or desirable  to  accomplish  the purposes of this  Agreement,
including,   without  limitation,   any  financing   statements,   endorsements,
assignments or other instruments of transfer.

     (b) Pledgor hereby  ratifies all that said  attorneys  shall lawfully do or
cause to be done pursuant to the power of attorney granted in subsection  11(a).
All powers,  authorizations and agencies contained in this Agreement are coupled
with an interest and are irrevocable  until this Agreement is terminated and the
security interests created hereby are released.

     12. Duty of the Administrative Agent. The Administrative  Agent's sole duty
with  respect to the  custody,  safekeeping  and  physical  preservation  of the
Collateral  in its  possession,  under  Section  9-207 of the Code or otherwise,
shall be to deal with it in the same  manner as the  Administrative  Agent deals
with  similar  securities  and  property  for its own  account,  except that the
Administrative  Agent  shall  have no  obligation  to invest  funds  held in any
Collateral  Account  and may hold  the  same as  demand  deposits.  Neither  the
Administrative  Agent,  any  Lender  nor  any  of  their  respective  directors,
officers,  employees or agents shall be liable for failure to demand, collect or
realize  upon  any of the  Collateral  or for any  delay in doing so or shall be
under any  obligation to sell or otherwise  dispose of any  Collateral  upon the
request of Pledgor or any other  Person or to take any other  action  whatsoever
with regard to the Collateral or any part thereof.

     13.  Execution of Financing  Statements.  Pursuant to Section  9-402 of the
Code and other applicable law, Pledgor  authorizes the  Administrative  Agent to
file financing  statements with respect to the Collateral  without the signature
of Pledgor in such form and in such filing offices as the  Administrative  Agent
reasonably  determines  appropriate  to perfect the  security  interests  of the
Administrative  Agent,  for the  ratable  benefit  of the  Lenders,  under  this
Agreement. A carbon,  photographic or other reproduction of this Agreement shall
be sufficient as a financing statement for filing in any jurisdiction.

     14. Authority of the Administrative  Agent.  Pledgor  acknowledges that the
rights and  responsibilities  of the  Administrative  Agent under this Agreement
with respect to any action taken by the Administrative  Agent or the exercise or
non-exercise by the Administrative Agent of any option,  voting right,  request,
judgment or other right or remedy  provided  for herein or  resulting or arising
out of this  Agreement  shall,  as  between  the  Administrative  Agent  and the
Lenders,  be governed by the Credit  Agreement and by such other agreements with
respect  thereto as may exist from time to time among them,  but, as between the
Administrative Agent and Pledgor, the Administrative Agent shall be conclusively
presumed to be acting as agent for each Lender with full and valid  authority so
to act or refrain from acting, and neither Pledgor nor the Issuer shall be under
any obligation, or entitlement, to make any inquiry respecting such authority.

     15.   Notices.   All   notices,   requests  and  demands  to  or  upon  the
Administrative  Agent or Pledgor  to be  effective  shall be in  writing  (or by
telex,  fax or similar  electronic  transfer  confirmed in writing) and shall be
deemed  to have been duly  given or made when  delivered  by hand or if given by
mail, when deposited in the mails by certified mail,  return receipt  requested,
or if by telex, fax or similar  electronic  transfer,  when sent and receipt has
been confirmed,  addressed to the Administrative Agent or Pledgor at its address
or  transmission  number for  notices  provided  in  Section  10.4 of the Credit
Agreement.  The Administrative  Agent and Pledgor may change their addresses and
transmission  numbers  for  notices  by notice in the  manner  provided  in this
Section.

     16.  Severability.  Any provision of this Agreement  which is prohibited or
unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective
to the extent of such prohibition or unenforceability  without  invalidating the
remaining provisions hereof, and any such prohibition or unenforceability in any
jurisdiction shall not invalidate or render  unenforceable such provision in any
other jurisdiction.  

     17. Amendments in Writing; No Waiver;  Cumulative Remedies. (a) None of the
terms or provisions of this Agreement may be waived,  amended,  supplemented  or
otherwise  modified except by a written  instrument  executed by Pledgor and the
Administrative  Agent,  on behalf of  Lenders,  as the case may be, as  required
pursuant to Section 10.2 of the Credit Agreement.

     (b)  Neither  the  Administrative  Agent  nor any  Lender  shall by any act
(except by a written  instrument  pursuant to subsection  17(a) hereof),  delay,
indulgence,  omission or  otherwise be deemed to have waived any right or remedy
hereunder  or to have  acquiesced  in any  Default or Event of Default or in any
breach of any of the terms and conditions  hereof.  No failure to exercise,  nor
any delay in  exercising,  on the part of the Agent or any  Lender,  any  right,
power or privilege  hereunder  shall operate as a waiver  thereof.  No single or
partial exercise of any right,  power or privilege  hereunder shall preclude any
other or further exercise  thereof or the exercise of any other right,  power or
privilege.  A waiver by the  Administrative  Agent or any Lender of any right or
remedy  hereunder  on any one  occasion  shall not be  construed as a bar to any
right or remedy which the  Administrative  Agent or such Lender would  otherwise
have on any future  occasion.  

     (c)  The  rights  and  remedies  herein  provided  are  cumulative,  may be
exercised  singly or  concurrently  and are not exclusive of any other rights or
remedies  provided by law. 

     18. Section  Headings.  The section headings used in this Agreement are for
convenience of reference only and are not to affect the  construction  hereof or
be taken into consideration in the interpretation hereof.

     19.  Successors  and  Assigns.  This  Agreement  shall be binding  upon the
successors  and  assigns  of  Pledgor  and  shall.  inure to the  benefit of the
Administrative  Agent and each Lender and their  successors and assigns,  except
that the  Pledgor may not assign or  transfer  any of its rights or  obligations
under or in respect of this Agreement  without the prior written  consent of the
Lenders.

     20.  Governing Law. This Agreement  shall be governed by, and construed and
interpreted in accordance with, the law of the State of New York.

     IN WITNESS  WHEREOF,  the  undersigned has caused this Agreement to be duly
executed and delivered as of the date first above written.

                                               CORNERSTONE PROPERTIES LIMITED 
                                               PARTNERSHIP
                                            
                                               By:  CORNERSTONE PROPERTIES INC.,
                                                    Its General Partner
                                                    By: ________________________
                                                    Name: ______________________
                                                    Title: _____________________







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