CORPORATE OFFICE PROPERTIES TRUST
10-Q, 1998-08-12
REAL ESTATE INVESTMENT TRUSTS
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 10-Q

(Mark one)

/X/ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES AND
    EXCHANGE ACT OF 1934

For the quarterly period ended            June 30, 1998
                               ------------------------------------------------

                                       or

/ / TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES AND
    EXCHANGE ACT OF 1934

For the transition period from                    to
                              --------------------  ---------------------------
                         Commission file number 0-20047


                        Corporate Office Properties Trust
             (Exact name of registrant as specified in its charter)

                   Maryland                                  23-2947217
        (State or other jurisdiction of                     (IRS Employer
        incorporation or organization)                   Identification No.)

One Logan Square, Suite 1105, Philadelphia, PA                  19103
   (Address of principal executive offices)                  (Zip Code)

       Registrant's telephone number, including area code: (215) 567-1800

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



Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days. [X] Yes [ ] No


On August 12, 1998, 9,771,083 shares of the Company's Common Shares of
Beneficial Interest, $0.01 par value, were outstanding.

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<PAGE>


                                               Table of Contents


<TABLE>
<CAPTION>
                                                   Form 10-Q
                                                   ---------

                                                                                                         PAGE
                                                                                                         ----
<S>           <C>                                                                                      <C>
PART I:  FINANCIAL INFORMATION

Item 1:      Financial Statements:
               Consolidated Balance Sheets as of June 30, 1998 (unaudited) and
                  December 31, 1997                                                                        3
               Consolidated Statements of Operations for the three and six 
                  months ended June 30, 1998 and 1997 (unaudited)                                          4 
               Consolidated Statements of Cash Flows for the six months ended
                  June 30, 1998 and 1997 (unaudited)                                                       5 
               Notes to Consolidated Financial Statements                                                  6
Item 2:      Management's Discussion and Analysis of Financial Condition and Results of Operations        10


PART II:  OTHER INFORMATION

Item 1:       Legal Proceedings                                                                           14
Item 2:       Changes in Securities                                                                       14
Item 3:       Defaults Upon Senior Securities                                                             14
Item 4:       Submission of Matters to a Vote of Security Holders                                         14
Item 5:       Other Information                                                                           14
Item 6:       Exhibits and Reports on Form 8-K                                                            14


SIGNATURES                                                                                                17
</TABLE>



                                       2
<PAGE>


PART I. FINANCIAL INFORMATION

ITEM 1. Financial Statements

                                       Corporate Office Properties Trust
                                          Consolidated Balance Sheet

             (Dollars in thousands, except share and per share data)
<TABLE>
<CAPTION>

                                                                            June 30,            December 31,
                                                                              1998                  1997
                                                                       -------------------- ---------------------
                                                                           (unaudited)
<S>                                                                         <C>                  <C>       
Assets
     Land                                                                   $   59,169           $   38,764
     Buildings and improvements                                                234,717              152,945
     Furniture, fixtures and equipment                                             265                  140
     Less accumulated depreciation                                              (5,479)              (3,224)
- ---------------------------------------------------------------------- -------------------- ---------------------
       Net investments in real estate                                          288,672              188,625

     Cash and cash equivalents                                                   4,914                3,395
     Restricted cash                                                               143                 --
     Tenant accounts receivable                                                    315                   78
     Deferred rent receivable                                                    1,221                  479
     Deferred financing costs, net                                               1,220                  857
     Prepaid and other assets, net                                               1,040                  100
- ---------------------------------------------------------------------- -------------------- ---------------------
       Total assets                                                         $  297,525           $  193,534
- ---------------------------------------------------------------------- -------------------- ---------------------

Liabilities and shareholders' equity
   Liabilities:
     Mortgage loans payable                                                 $  144,417           $  114,375
     Accounts payable and accrued expenses                                       1,282                  932
     Rents received in advance and security deposits                             1,592                  425
     Dividends/distributions payable                                             2,706                1,276
- ---------------------------------------------------------------------- -------------------- ---------------------
       Total liabilities                                                       149,997              117,008
- ---------------------------------------------------------------------- -------------------- ---------------------

   Minority interests:
     Preferred Units                                                            52,500               52,500
     Partnership Units                                                          11,999               12,362
- ---------------------------------------------------------------------- -------------------- ---------------------
       Total minority interests                                                 64,499               64,862
- ---------------------------------------------------------------------- -------------------- ---------------------

   Commitments and contingencies                                                   --                    --

   Shareholders' equity:
    Common Shares of beneficial interest ($0.01 par value; 45,000,000
      authorized, 9,771,083 and 2,266,083 shares, issued and outstanding at June
      30, 1998 and December 31, 1997,
      respectively)                                                                 98                   23
    Additional paid-in capital                                                  89,287               16,620
    Accumulated deficit                                                         (6,356)              (4,979)
- ---------------------------------------------------------------------- -------------------- ---------------------
       Total shareholders' equity                                               83,029               11,664
- ---------------------------------------------------------------------- -------------------- ---------------------

       Total liabilities and shareholders' equity                           $  297,525           $  193,534
- ---------------------------------------------------------------------- -------------------- ---------------------
</TABLE>

                 See accompanying notes to financial statements.



                                       3
<PAGE>


                        Corporate Office Properties Trust
                      Consolidated Statements of Operations

                  (Dollars in thousands, except per share data)
                                   (unaudited)

<TABLE>
<CAPTION>

                                                                   For the three months ended   For the six months ended
                                                                            June 30,                    June 30,
                                                                  ----------------------------- --------------------------
                                                                       1998           1997         1998          1997
                                                                  --------------- ------------- ------------ -------------
<S>                                                                <C>              <C>          <C>          <C>     
Revenues
   Rental income                                                   $  7,058         $    626     $ 11,977     $  1,252
   Tenant recoveries and other income                                   784               6         1,390           13
- ----------------------------------------------------------------- --------------- ------------- ------------ -------------
     Total revenues                                                   7,842             632        13,367        1,265
- ----------------------------------------------------------------- --------------- ------------- ------------ -------------

Expenses
   Property operating                                                 1,645               6         2,544           12
   General and administrative                                           359              90           658          176
   Interest expense                                                   2,416             307         4,575          615
   Amortization of deferred financing costs                              83               3           147            6
   Depreciation and other amortization                                1,281             139         2,258          278
   Reformation costs                                                   --               --            637          --
- ----------------------------------------------------------------- --------------- ------------- ------------ -------------
     Total expenses                                                   5,784             545        10,819        1,087
- ----------------------------------------------------------------- --------------- ------------- ------------ -------------

Income before minority interests                                      2,058              87         2,548          178

Minority interests
   Preferred Units                                                     (853)            --         (1,706)         --
   Partnership Units                                                   (276)            --           (412)         --
- ----------------------------------------------------------------- --------------- ------------- ------------ -------------

Net income                                                           $  929         $    87       $   430      $   178
- ----------------------------------------------------------------- --------------- ------------- ------------ -------------

Earnings per Share
  Basic and Diluted                                                 $  0.12         $  0.06       $  0.09      $  0.13
- ----------------------------------------------------------------- --------------- ------------- ------------ -------------
</TABLE>

                                See accompanying notes to financial statements.


                                       4
<PAGE>


                                       Corporate Office Properties Trust
                                     Consolidated Statements of Cash Flows

                                            (Dollars in thousands)
                                                  (unaudited)

<TABLE>
<CAPTION>
                                                                        For the six months ended
                                                                                June 30,
                                                                       ----------------------------
                                                                           1998          1997
                                                                       ------------- --------------
<S>                                                                   <C>           <C>        
Cash flows from operating activities:
   Net income                                                            $   430       $   178
   Adjustments to reconcile net income to net cash
     provided by operating activities:
   Minority interests                                                      2,118           --
   Depreciation and amortization                                           2,258           278
   Amortization of deferred financing costs                                  147             6
   Increase in deferred rent receivable                                     (742)          (33)
   Increase in tenant accounts receivable and other assets                (1,029)          (33)
   Increase (decrease) in accounts payable, accrued expenses, rents        
     received in advance and security deposits                             1,517            (1)
- ---------------------------------------------------------------------- ------------- --------------
     Net cash provided by operating activities                             4,699           395
- ---------------------------------------------------------------------- ------------- --------------

Cash flows from investing activities:
   Proceeds from maturity of marketable securities                          --             879
   Purchase of marketable securities                                        --            (800)
   Increase in restricted cash                                              (143)          --
   Purchases of and additions to investments in real estate              (95,836)          --
   Leasing commissions paid                                                 (151)          --
- ---------------------------------------------------------------------- ------------- --------------
     Net cash (used in) provided by investing activities                 (96,130)           79
- ---------------------------------------------------------------------- ------------- --------------

Cash flows from financing activities:
   Net proceeds from issuance of Common Shares                            72,742           --
   Dividends paid                                                           (623)         (355)
   Distributions paid                                                     (2,235)          --
   Proceeds from mortgage loans payable                                   23,750           --
   Repayments of mortgage loans payable                                     (174)         (139)
   Deferred financing costs                                                 (510)          --
- ---------------------------------------------------------------------- ------------- --------------
- ---------------------------------------------------------------------- ------------- --------------
     Net cash provided by (used in) financing activities                  92,950          (494)
- ---------------------------------------------------------------------- ------------- --------------

Net increase (decrease) in cash and cash equivalents                       1,519           (20)

Cash and cash equivalents
   Beginning of period                                                     3,395           258
- ---------------------------------------------------------------------- ------------- --------------
   End of period                                                       $   4,914       $   238
- ---------------------------------------------------------------------- ------------- --------------
</TABLE>

                                See accompanying notes to financial statements.



                                       5
<PAGE>





                        Corporate Office Properties Trust
                   Notes to Consolidated Financial Statements

                  (Dollars in thousands, except per share data)
                                   (unaudited)


1.  Organization and Formation of Company

         Corporate Office Properties Trust (formerly Royale Investments, Inc.)
(the "Company") is a self-administered REIT which focuses on the ownership,
acquisition and management of suburban office buildings. The Company was formed
in 1988 as a Minnesota corporation. The Company has qualified as a real estate
investment trust ("REIT") as defined in the Internal Revenue Code (the "Code").
As of June 30, 1998, the Company's portfolio included 31 commercial real estate
properties leased for office and retail purposes.

         The Company's operations are conducted primarily through Corporate
Office Properties, L.P. (the "Operating Partnership"), a partnership formed to
own real estate both directly and through subsidiary partnerships and limited
liability companies ("LLCs"). The Company is the sole general partner in the
Operating Partnership and as of June 30, 1998, owned 75.8% of the Operating
Partnership's common partnership units ("Partnership Units"). The general
partner of several of the subsidiary partnerships is Corporate Office Properties
Holdings, Inc. ("COPH"), a wholly owned subsidiary of the Company.

         On January 1, 1998, the Company changed its name to Corporate Office
Properties Trust, Inc. On March 16, 1998, the Company was reformed as a Maryland
real estate investment trust and changed its name to Corporate Office Properties
Trust (the "Reformation"). In connection with the Reformation, 45,000,000 common
shares and 5,000,000 preferred shares were authorized and each share of common
stock was exchanged for one common share of beneficial interest, par $0.01
("Common Share") in Corporate Office Properties Trust. All common stock
references in the financial statements have been restated as Common Shares. This
restatement had no effect on net operations or the amounts presented as
shareholders' equity.

2.       Summary of Significant Accounting Policies

         The financial statements have been prepared by the Company without
audit, pursuant to the rules and regulations of the Securities and Exchange
Commission. Certain information and footnote disclosures normally included in
the financial statements prepared in accordance with generally accepted
accounting principles have been condensed or omitted pursuant to such rules and
regulations, although the Company believes that the disclosures are adequate to
make the information presented not misleading. In order to conform with
generally accepted accounting principles, management, in preparation of the
Company's financial statements, is required to make estimates and assumptions
that affect the reported amounts of assets and liabilities and disclosure of
contingent assets and liabilities as of June 30, 1998 and December 31, 1997, and
the reported amounts of revenues and expenses for the three and six months ended
June 30, 1998 and 1997. Actual results could differ from those estimates.

         In the opinion of the Company, all adjustments (consisting solely of
normal recurring matters, except for $637 of costs associated with the
Reformation) necessary to fairly present the financial position of the Company
as of June 30, 1998, the results of its operations for the three and six months
ended June 30, 1998 and 1997 and the cash flows for the six months ended June
30, 1998 and 1997 have been included. The results of operations for such interim
periods are not necessarily indicative of the results for a full year. For
further information, refer to the Company's consolidated financial statements
and footnotes thereto included in the Annual Report on Form 10-K for the year
ended December 31, 1997.

Basis of Presentation

         The consolidated financial statements of the Company at June 30, 1998
and December 31, 1997 include the accounts of the Company, the Operating
Partnership (and its subsidiary partnerships and LLCs), and COPH. 


                                       6
<PAGE>

All intercompany transactions and balances have been eliminated in
consolidation. Certain amounts from prior periods have been reclassified to
conform to current year presentation. The reclassifications had no effect on net
operations or shareholders' equity.

         The Company, as general partner, controls the Operating Partnership;
therefore consolidated financial reporting and accounting have been applied.
Minority interests represent the Partnership Units and preferred partnership
units ("Preferred Units") of the Operating Partnership not owned by the Company,
each of which include certain interests retained by the Chairman of the Board of
Trustees and the President and Chief Executive Officer of the Company ("Retained
Interests").

Earnings Per Share ("EPS")

         Pursuant to SFAS No. 128, the Company has computed basic and diluted
EPS for the three and six months ended June 30, 1998 and 1997. The weighted
average common shares outstanding for purposes of basic and diluted EPS
calculations are as follows (in thousands):
<TABLE>
<CAPTION>

                                               Three months Ended June 30,     Six Months Ended June 30,
                                                  1998            1997           1998            1997
                                                  ----            ----           ----            ----
<S>                                                <C>            <C>             <C>            <C>  
Weighted average common shares-basic               7,628          1,420           4,964          1,420
Assumed conversion of stock options                   21            --               21            --
Conversion of Preferred Units                      7,500            --              --             --
Conversion of Common Units                         2,582            --              --             --
                                                   -----          -----           -----          -----
Weighted average common shares-diluted            17,731          1,420           4,985          1,420
                                                   -----          -----           -----          -----
                                                   -----          -----           -----          -----
</TABLE>



         The diluted EPS computation for the six months ended June 30, 1998 does
not assume conversion of convertible Preferred Units and convertible Partnership
Units since such conversion would have an antidilutive effect on EPS. The
conversion of convertible Preferred Units and convertible Partnership Units into
Common Shares would increase the diluted weighted average common shares
denominator by 7,500,000 and 2,582,000 Common Shares, respectively, for the six
months ended June 30, 1998. Such conversions could potentially dilute EPS in the
future.

Recent Accounting Pronouncements

         In June 1997, the FASB issued Statement of Financial Accounting
Standards No. 131 (`SFAS 131), "Disclosures about Segments of an Enterprise and
Related Information". This statement, effective for financial statements for
fiscal years beginning after December 15, 1997, requires that a public business
enterprise report financial and descriptive information about its reportable
operating segments. Generally, financial information is required to be reported
on the basis that it is used internally for evaluating segment performance and
deciding how to allocate resources to segments. While this statement effects
only financial statement disclosures, the Company currently does not expect
adoption of this Statement to have a material effect on the preparation of its
financial statement presentation or related footnote disclosures. SFAS 131 is
not effective for interim financial statements in the initial year of its
application.

         In March 1998, the FASB's Emerging Issues Task Force (the "Task Force")
reached consensus on Emerging Issues Task Force Issue No. 97-11, "Accounting for
Internal Costs Relating to Real Estate Property Acquisitions" ("EITF 97-11").
EITF 97-11, effective March 19, 1998, requires that internal costs of
preacquisition activities incurred in connection with the acquisition of an
operating property should be expensed as incurred. The Company does not incur
significant internal costs from preacquisition activities; therefore the
adoption of EITF 97-11 is not expected to have a material effect on the
Company's consolidated statement of operations.

                                       7
<PAGE>

3.   Acquisitions of Real Estate

         On April 30, 1998, the Company, through affiliates of the Operating
Partnership, acquired nine multistory office buildings and three office/flex
buildings in the Baltimore/Washington Corridor in Linthicum, Anne Arundel
County, Maryland (the "Airport Square Properties"). The properties were acquired
for cash at an aggregate purchase price of $72,618, including $1,139 in
transaction costs.

         On May 28, 1998, the Company, through affiliates of the Operating
Partnership, acquired two multistory office buildings located in Fairfield, New
Jersey (the "Fairfield Properties"). The properties were acquired at an
aggregate price of $29,405, including $605 in transaction costs, paid through
the assumption of debt of $6,465 and proceeds from the Credit Facility, as
defined below (Note 5).

4.  Issuance of Shares and Options

         In March 1998, options to purchase an aggregate of 45,000 shares were
granted to an officer and four independent Trustees at a grant price of $12.25
per share. Options relating to 20,000 Common Shares vest one year after the date
of grant and options relating to 25,000 Common Shares vest ratably over 3 years
following the date of grant. The options expire ten years after the date of
grant.

         In January 1998, options to purchase 2,500 shares were exercised. In
March 1998, options to purchase an additional 2,500 shares were exercised.

         On April 27 1998, the Company completed the sale of 7,500,000 Common
Shares to the public at a price of $10.50 per share (the "Offering"). The net
proceeds were contributed to the Operating Partnership in exchange for 7,500,000
Partnership Units. The Operating Partnership used the proceeds to fund
acquisitions.

5.  Mortgage Loans Payable

         On May 28, 1998, the Company obtained a $100,000 secured revolving
credit facility (the "Credit Facility") initially collateralized by the Airport
Square Properties and one of the Fairfield Properties. The Credit Facility is a
variable rate loan bearing interest at LIBOR plus 175 basis points and provides
for monthly payments of interest only. A fee of 25 basis points per annum on the
unused amount of the Credit Facility will be payable quarterly, in arrears. As
of June 30, 1998, $23,750 was borrowed under the Credit Facility. In addition,
$5,000 of the Credit Facility was issued as a letter of credit, which the
Company posted as a deposit in connection with the Constellation Transaction as,
defined below (Note 9).

         On May 28, 1998, the Company assumed $6,465 in debt collateralized by
one of the Fairfield Properties. The debt bears interest at a fixed rate of
8.29% per annum and provides for monthly payments of principal and interest
totaling $56.

6.  Dividends and Distributions

         The Company declared a dividend on March 16, 1998 of $0.15 per Common
Share, which was paid on April 15, 1998 to shareholders of record as of March
31, 1998. The Company also declared a dividend on June 2, 1998 of $0.15 per
Common Share which was paid on July 15, 1998 to shareholders of record as of
June 30, 1998.

         The Company declared distributions to minority interests holding
Partnership Units and Preferred Units of $388 and $853, respectively, which were
paid on April 15, 1998. The Company declared distributions to minority interests
holding Partnership Units and Preferred Units of $387 and $853, respectively,
which were paid on July 15, 1998.

                                       8
<PAGE>



7.  Supplemental Information to Statements of Cash Flows
<TABLE>
<CAPTION>

                                                                         For the six months ended June 30,
                                                                         -----------------------------------
                                                                               1998              1997
                                                                         ----------------- -----------------
<S>                                                                          <C>             <C>    
Supplemental schedule of non-cash investing and financing activities:
   In conjunction with certain property acquisitions the following 
   assets and liabilities were assumed:
   Purchase of real estate                                                    $ 6,465        $    --
                                                                            ----------      ----------
   Mortgage loans                                                              (6,465)            --
   Proceeds from acquisitions of properties                                   $   --         $    --
                                                                            ----------      ----------
                                                                            ----------      ----------
</TABLE>



8.  Commitments and Contingencies

         On May 14, 1998, the Company entered into a series of agreements
through affiliates of the Operating Partnership with Constellation Real Estate
Group, Inc. ("Constellation") and certain of its affiliates (the "Constellation
Transaction") to acquire (i) interests in eighteen operating office and retail
properties, (ii) options and rights of first refusal on 91 acres of land and
(iii) certain assets of Constellation's real estate management subsidiary,
including its 75% interest in Constellation Realty Management, LLC, a real
estate management firm. The total purchase price of the Constellation
Transaction is approximately $204,600 to be paid as follows: (i) $107,600 of
cash and/or assumption of debt, (ii) $72,750 of Common Shares (approximately
6,928,000 Common Shares at $10.50 per share) and (iii) $24,250 of Class A
Convertible Preferred Shares (convertible into Common Shares after two years at
the rate of $13.34 per Common Share). A Special Meeting of the shareholders to
vote to approve the Constellation Transaction is scheduled for August 21, 1998.
In connection with the Constellation Transaction, $5,000 of the Credit Facility
was issued as a letter of credit, which the Company posted as a deposit.

         Other commitments and contingencies of the Company that existed at
December 31, 1997, are substantially unchanged.

9.  Pro Forma Financial Information (Unaudited)

         The acquisitions by the Company during 1997 and 1998 were accounted for
by the purchase method. The results of operations for the properties acquired
have been included in the accompanying consolidated statements of operations
from their respective purchase dates through June 30, 1998.

         The following pro forma condensed consolidated financial information of
the Company has been prepared as if the all property acquisitions occurring
during 1997 and 1998 had occurred as of the beginning of the period, and
therefore include pro forma adjustments as deemed necessary by management. The
pro forma financial information is unaudited and is not necessarily indicative
of the results of which actually would have occurred if the acquisitions had
occurred on January 1, 1997 and 1998, nor does it purport to represent the
results of operations for future periods.
<TABLE>
<CAPTION>
                                                               For the six months ended June 30,
                                                             --------------------------------------
                                                                   1998                1997
                                                             ------------------ -------------------
<S>                                                               <C>                <C>     
   Pro forma total revenue                                        $   18,569         $ 16,105
                                                                  ----------         --------
   Pro forma net income                                           $    1,731         $    721
                                                                  ----------         --------
   Pro forma earnings per share - Basic and Diluted               $     0.18         $   0.07
                                                                  ----------         --------
                                                                  ----------         --------
</TABLE>

                                       9
<PAGE>


ITEM 2. Management's Discussion and Analysis of Financial Condition and Results
        of Operations

             (Dollars in thousands, except share and per share data)

         This Form 10-Q contains forward-looking statements within the meaning
of Section 27A of the Securities Act of 1993 and Section 21E of the Securities
Exchange Act of 1934. The words "believe", "expect", "anticipate", "intend",
"estimate" and other expressions which are predictions of or indicate future
events and trends and which do not relate to historical matters identify
forward-looking statements. The Company's actual results could differ materially
from those set forth in the forward-looking statements. Certain factors that
might cause such a difference include the following: real estate investment
considerations, such as the effect of economic and other conditions in the
market area on cash flows and values; the need to renew leases or release space
upon the expiration of current leases, and the ability of a property to generate
revenues sufficient to meet debt service payments and other operating expenses;
and risks associated with borrowings, such as the possibility that the Company
will not have sufficient funds available to make principal payments on
outstanding debt or outstanding debt may be refinanced at higher interest rates
or otherwise on terms less favorable to the Company.

         The following discussion and analysis of the financial condition and
results of operations should be read in conjunction with the accompanying
financial statements and notes thereto.

         Overview

         The Company's results of operations reflect its growth resulting from
the acquisitions of 10 office properties in October 1997, 12 office properties
in April 1998 and 2 office properties in May 1998. The 1998 acquisitions were
financed with the proceeds from the Offering in April 1998, the proceeds of the
Credit Facility and the assumption of debt in connection with the acquisition of
the Fairfield Properties.

         Results of Operations

         Comparison of the Six Months Ended June 30, 1998 and 1997: Total
revenues, which include rental income, recoveries from tenants and other income,
increased by $12,102 for the six months ended June 30, 1998 as compared to the
corresponding prior year period. Of this increase, $10,725 results from an
increase in base rents, substantially all of which is attributable to the
effects of the property acquisitions. Tenant recoveries and other income
increased $1,377 due predominantly to tenant recoveries from newly acquired
properties.

         Property operating expenses and depreciation and amortization increased
by $4,512 primarily as a result of the effects of the property acquisitions.
Interest expense and amortization of deferred financing costs increased by
$4,101 as a result of debt obtained or assumed in connection with certain of the
Company's acquisitions. General and administrative expenses increased by $482
due to the conversion of the Company from an externally-advised REIT to a
self-administered REIT, which resulted in the addition of certain management and
other staffing functions. The operations for the six months ended June 30, 1998
also included $637 in costs associated with the Reformation on March 16, 1998.

         As a result of the above factors, income before minority interests
increased by $2,370. Minority interests represent the portion of the Operating
Partnership which is not owned by the Company. The Company did not have minority
interests in the corresponding prior year period. Earnings per share decreased
by $0.04 per share due to the issuance of Common Shares in October 1997 and in
the Offering of April, 1998 combined with other factors discussed above.

         Comparison of the Three Months Ended June 30, 1998 and 1997: Total
revenues, which include rental income, recoveries from tenants and other income,
increased by $7,210 for the three months ended June 30, 1998 as compared to the
corresponding prior year period. Of this increase, $6,432 results from an
increase in base rents, substantially all of which is attributable to the
effects of the property acquisitions. Tenant recoveries and other income
increased $778 due predominantly to tenant recoveries from newly acquired
properties.

                                       10
<PAGE>


         Property operating expenses and depreciation and amortization increased
by $2,781 primarily as a result of the effects of the property acquisitions.
Interest expense and amortization of deferred financing costs increased by
$2,189 as a result of debt obtained or assumed in connection with certain of the
Company's acquisitions. General and administrative expenses increased by $269
due to the conversion of the Company from an externally-advised REIT to a
self-administered REIT, which resulted in the addition of certain management and
other staffing functions.

         As a result of the above factors, income before minority interests
increased by $1,971. Minority interests represent the portion of the Operating
Partnership which is not owned by the Company. The Company did not have minority
interests in the corresponding period in 1997. Earnings per share increased by
$0.06 per share due to the factors discussed above partially offset by the
effects of the issuance of Common Shares in October, 1997 and the Offering of
April 1998.

         Liquidity and Capital Resources

         Historically, cash provided from operations represented the primary
source of liquidity to fund distributions, pay debt service and fund working
capital requirements. The Company expects to continue to meet its short-term
capital needs from property cash flow, including all property expenses, general
and administrative expenses, dividend and distribution requirements and
recurring capital improvements and leasing commissions. The Company does not
anticipate borrowing to meet these requirements.

         In January 1998, the Company paid dividends of $0.125 per Common Share,
amounting to $282, and distributions to minority interests holding Partnership
Units and Preferred Units totaling $274 and $720, respectively. In April 1998,
the Company paid dividends of $0.15 per Common Share, amounting to $341, and
distributions to minority interests holding Partnership Units and Preferred
Units totaling $388 and $853, respectively. In July 1998, the Company paid
dividends totaling $0.15 per Common Share, amounting to $1,466, and
distributions to minority interests holding Partnership Units and Preferred
Units amounted to $387 and $853, respectively.

         On April 27, 1998, the Company completed the sale of 7,500,000 Common
Shares to the public at a price of $10.50 per share. The Company used the
proceeds to acquire 7,500,000 Partnership Units and increase its percentage
interest in the Operating Partnership to approximately 75.8%. Net proceeds from
the Offering were $72,742, which were used principally by the Operating
Partnership on April 30, 1998, to acquire the Airport Square Properties,
consisting of twelve office properties in the Baltimore/Washington corridor
totaling approximately 815,000 net rentable square feet. In connection with the
Offering, the Company's Shares were listed on the New York Stock exchange under
the symbol "OFC".

         On May 28, 1998, the Company, through the Operating Partnership,
acquired the Fairfield Properties, two multistory office buildings located in
Fairfield, New Jersey totaling approximately 262,000 net rentable square feet.

         On May 28, 1998, the Company obtained a $100,000 senior secured
revolving Credit Facility. The Credit Facility is a variable rate loan bearing
interest at LIBOR plus 175 basis points and provides for monthly payments of
interest only. A fee of 25 basis points per annum on the unused amount of the
Credit Facility is payable quarterly, in arrears. On May 28, 1998, the Company
borrowed $23,750 under the Credit Facility to fund a portion of the Fairfield
Properties' acquisition. The Company intends to utilize the remaining balance of
the Credit Facility for acquisitions, renovations, tenant improvements and
leasing commissions. The Credit Facility is collateralized by the Airport Square
Properties and one of the Fairfield Properties.

         On May 28, 1998, also in connection with the Fairfield Properties
acquisition, the Company assumed $6,465 in mortgage debt collateralized by one
of the Fairfield Properties. The loan bears interest at a fixed rate of 8.29%
per annum and provides for monthly payments of principal and interest totaling
$56.

                                       11
<PAGE>

         On May 14, 1998, the Company entered into a series of agreements
through affiliates of the Operating Partnership with Constellation and certain
of its affiliates to acquire (i) interests in eighteen operating office and
retail properties, (ii) options and rights of first refusal on 91 acres of land
and (iii) certain assets of Constellation's real estate management subsidiary,
including its 75% interest in Constellation Realty Management, LLC, a real
estate management firm. The total purchase price of the Constellation
Transaction is approximately $204,600 to be paid as follows: (i) $107,600 of
cash and/or assumption of debt, (ii) $72,750 of Common Shares (approximately
6,928,000 Common Shares at $10.50 per share) and (iii) $24,250 of Class A
Convertible Preferred Shares (convertible into Common Shares after two years at
the rate of $13.34 per Common Share). A Special Meeting of the shareholders to
vote to approve the Constellation Transaction is scheduled for August 21, 1998.
This transaction may partially be funded by availability under the Credit
Facility. In addition, the Company is presently negotiating with several lending
institutions regarding additional secured financing to fund the Constellation
Transaction. In connection with the Constellation Transaction, as of June 30,
1998, $5,000 of the Credit Facility was issued as a letter of credit which the
Company posted as a deposit.

         To further meet long-term capital needs, the Company is presently
negotiating with several lending institutions regarding additional secured
financing arrangements, which the Company intends to utilize for additional
acquisitions, renovations, tenant improvements and leasing commissions.
Acquisitions may also be financed through net cash provided from operations or
equity issuances. There is no assurance that the Company will be able to obtain
such financing or that such financing will be adequate to fund the Company's
acquisition and capital program.

         The Company expects to meet its long term liquidity requirements, such
as property acquisitions, scheduled debt maturities, major renovations,
expansions, and other non-recurring capital improvements through long-term
collateralized indebtedness and the issuance of additional equity securities.

         Statement of Cash Flows

         During the six months ended June 30, 1998, the Company generated $4,699
in cash flow from operating activities (net of nonrecurring Reformation costs of
$637), an increase of $4,304 compared to the corresponding prior year period.
This increase is due primarily to the effects of the Company's acquisition of
operating properties. Other sources of cash flow consisted of (i) $72,742 in net
proceeds from the Offering and (ii) $23,750 in additional borrowings under the
Company's Credit Facility. During the six months ended June 30, 1998, the
Company's major uses of cash included (i) $95,987 to fund property acquisitions,
tenant improvements, and leasing commissions and (ii) $2,858 to pay dividends to
shareholders and distributions to minority interests holding Partnership Units
and Preferred Units.

         Funds From Operations

         The Company considers Funds From Operation ("FFO") to be helpful to
investors as a measure of the financial performance of an equity REIT. In
accordance with NAREIT's definition, FFO is defined as net income (loss) 
computed in accordance with GAAP, excluding gains (or losses) from debt 
restructuring and sales of property, plus real estate-related depreciation and
amortization and afteradjustments for unconsolidated partnerships and joint
ventures and extraordinary and nonrecurring items. FFO does not represent cash 
generated from operating activities determined in accordance with GAAP and 
should not be considered as an alternative to net income (determined in 
accordance with GAAP) as an indication of the Company's financial performance or
to cash flow from operating activities (determined in accordance with GAAP) as a
measure of the Company's liquidity, nor is it indicative of funds available to 
fund the Company's cash needs, including its ability to make cash distributions.
Other REITs may not define FFO in accordance with the current NAREIT definition
or may interpret the current NAREIT definition differently from the Company. FFO
for the six months ended June 30, 1998 and 1997, as calculated in accordance 
with the NAREIT definition published in March 1995, are summarized in the 
following table (in thousands).

                                       12
<PAGE>


<TABLE>
<CAPTION>
                                               Three Months Ended June 30,      Six Months Ended June 30,
                                               ---------------------------      -------------------------
                                                  1998             1997            1998            1997
                                                  ----             ----            ----            ----
<S>                                          <C>              <C>             <C>             <C>      
Income before minority interests .........     $  2,058        $     87         $  2,548        $    178
                                               --------        --------         --------        --------
Add: Nonrecurring charge                                                                    
   Reformation costs .....................         --              --                637            --
Add:  Real estate related depreciation and  
   amortization ..........................        1,270             139            2,241             277 
Less:  Preferred Unit distributions ......         (853)           --             (1,706)           --
                                               --------        --------         --------        --------
Funds from operations ....................        2,475             226            3,720             455
Add:  Preferred Unit distributions .......          853            --              1,706            --
Funds from operations assuming                                                              
   conversion of Preferred Units .........     $  3,328        $    226         $  5,426        $    455
                                               --------        --------         --------        --------
                                               --------        --------         --------        --------
Weighted average Common  Shares/Units                                                       
   outstanding (1) .......................       10,210           1,420            7,546           1,420
                                               --------        --------         --------        --------
                                               --------        --------         --------        --------
Weighted average Common Shares/Units                                                        
   outstanding diluted (2) ...............       17,731           1,420           15,067           1,420
                                               --------        --------         --------        --------
                                               --------        --------         --------        --------
</TABLE>

- ---------------
(1)      Assumes redemption of all Partnership Units, calculated on a weighted
         average basis for Common Shares. Includes 282,508 Common Shares
         issuable upon redemption of Partnership Units issuable upon the
         conversion of the Retained Interests. Excludes the weighted average
         effect of the conversion of 186,455 Retained Interests into 186,455
         Preferred Units and 1,913,545 Preferred Units, both convertible into an
         aggregate of 7,499,940 Partnership Units which are, in turn, redeemable
         for
         7,499,940 Common Shares.

(2)      Assumes redemption of all Partnership Units, calculated on a weighted
         average basis for Common Shares. Includes 282,508 Common Shares
         issuable upon redemption of Partnership Units issuable upon the
         conversion of the Retained Interests. Includes the weighted average
         effect of the conversion of 186,455 Retained Interests into 186,455
         Preferred Units and 1,913,545 Preferred Units, both convertible into an
         aggregate of 7,499,940 Partnership Units which are, in turn, redeemable
         for 7,499,940 Common Shares. Includes 70,000 Common Shares for the
         assumed conversion of stock options (using the Treasury stock method).
         Conversion of convertible Preferred Units and Partnership Units is
         assumed in computing the diluted weighted average Common Shares
         denominator since such conversion has a dilutive effect on FFO.



                                       13
<PAGE>


PART II. OTHER INFORMATION

ITEM 1. Legal Proceedings

         The Company is not currently involved in any material litigation nor, 
to the Company's knowledge, is any material litigation currently threatened 
against the Company (other than routine litigation arising in the ordinary 
course of business, substantially all of which is expected to be covered by 
liability insurance).

ITEM 2. Changes In Securities

     None.

ITEM 3. Defaults Upon Senior Securities

     None.

ITEM 4. Submission Of Matters To A Vote Of Security Holders

     None.

ITEM 5. Other Information

      None.

ITEM 6. Exhibits and Reports on Form 8-K

(a)   Exhibits:

<TABLE>
<CAPTION>
           EXHIBIT
             NO.                                             DESCRIPTION
         ------------ ------------------------------------------------------------
          <S>         <C>  

             2.1      Assignment of Partnership Interests dated as of April 30,
                      1998 between Airport Square Limited Partnership, Airport
                      Square Corporation, Camp Meade Corporation and COPT
                      Airport Square One LLC and COPT Airport Square Two LLC.
                      (filed with the Company's Current Report on Form 8-K on
                      May 14, 1998 and incorporated herein by reference).

             2.2      Contribution Agreement between the Company and the
                      Operating Partnership and certain Constellation affiliates
                      (filed as Exhibit A of the Company's Schedule 14A
                      Information on June 26, 1998 and incorporated herein by
                      reference).

             2.3      Service Company Asset Contribution Agreement between the
                      Company and the Operating Partnership and certain
                      Constellation affiliates (filed as Exhibit B of the
                      Company's Schedule 14A Information on June 26, 1998 and
                      incorporated herein by reference).

             2.4      Amended and Restated Limited Partnership Agreement of the
                      Operating Partnership dated March 16, 1998.

            10.1      Assignment of Purchase and Sale Agreement dated as of
                      April 30, 1998 between Aetna Life Insurance Company and
                      the Operating Partnership. (filed with the Company's
                      Current Report on Form 8-K on May 14, 1998 and
                      incorporated herein by reference).

            10.2      Assignment of Loan Purchase and Sale Agreement dated as of
                      April 30, 1998 between Constellation Real Estate, Inc. and
                      the Operating Partnership. (filed with the Company's
                      Current Report on Form 8-K on May 14, 1998 and
                      incorporated herein by reference).


                                       14
<PAGE>

            10.3      Purchase and Sale Agreement dated as of April 1, 1998
                      between Aetna Life Insurance Company and Airport Square
                      Limited Partnership (filed with the Company's Current
                      Report on Form 8-K on May 14, 1998 and incorporated herein
                      by reference).

            10.4      Loan Purchase and Sale Agreement dated as of March 13,
                      1998 between Aetna Life Insurance Company and
                      Constellation Real Estate, Inc. (filed with the Company's
                      Current Report on Form 8-K on May 14, 1998 and
                      incorporated herein by reference).

            10.5      Amendment to Loan Purchase and Sale Agreement dated as of
                      April 16, 1998 between Aetna Life Insurance Company and
                      Constellation Real Estate, Inc. (filed with the Company's
                      Current Report on Form 8-K on May 14, 1998 and
                      incorporated herein by reference).

            10.6      Purchase and Sale Agreement dated as of March 4, 1998
                      between 695 Rt. 46 Realty, LLC, 710 Rt. 46 Realty, LLC and
                      COPT Acquisitions, Inc. (filed with the Company's Current
                      Report on Form 8-K on June 10, 1998 and incorporated
                      herein by reference).

            10.7      Letter Amendment to Purchase and Sale Agreement dated as
                      of March 26, 1998 between 695 Rt. 46 Realty, LLC, 710 Rt.
                      46 Realty, LLC and COPT Acquisitions, Inc. (filed with the
                      Company's Current Report on Form 8-K on June 10, 1998 and
                      incorporated herein by reference).

            10.8      Secured Promissory Note dated as of April 29, 1997 between
                      710 Rt. 46 Realty, LLC and Life Investors Insurance
                      Company of America (filed with the Company's Current
                      Report on Form 8-K on June 10, 1998 and incorporated
                      herein by reference).

            10.9      Mortgage and Security Agreement dated as of April 29, 1997
                      between 710 Rt. 46 Realty, LLC and Life Investors
                      Insurance Company of America (filed with the Company's
                      Current Report on Form 8-K on June 10, 1998 and
                      incorporated herein by reference).

            10.10     Senior Secured Revolving Credit Agreement dated as of May
                      28, 1998 between Corporate Office Properties, L.P.,
                      Corporate Office Properties Trust, Any Mortgaged Property
                      Subsidiary and Bankers Trust Company (filed with the
                      Company's Current Report on Form 8-K on June 10, 1998 and
                      incorporated herein by reference).

            10.11     Option Agreement between the Operating Partnership and
                      NBP-III, LLC (a Constellation affiliate) (filed as Exhibit
                      C of the Company's Schedule 14A Information on June 26,
                      1998 and incorporated herein by reference).

            10.12     Option Agreement between the Operating Partnership and
                      Constellation Gatespring II, LLC (a Constellation
                      affiliate) (filed as Exhibit D of the Company's Schedule
                      14A Information on June 26, 1998 and incorporated herein
                      by reference).

            10.13     First Amendment to Option Agreement between the Operating
                      Partnership and NBP-III, LLC (a Constellation affiliate)
                      (filed as Exhibit E of the Company's Schedule 14A
                      Information on June 26, 1998 and incorporated herein by
                      reference).

            10.14     First Amendment to Option Agreement between the Operating
                      Partnership and Constellation Gatespring II, LLC (a
                      Constellation affiliate) (filed as Exhibit F of the
                      Company's Schedule 14A Information on June 26, 1998 and
                      incorporated herein by reference).

                                       15
<PAGE>

            10.15     Development Property Acquisition Agreement between the
                      Operating Partnership and Constellation Properties, Inc.
                      (a Constellation affiliate) (filed as Exhibit G of the
                      Company's Schedule 14A Information on June 26, 1998 and
                      incorporated herein by reference).

            10.16     Development Property Acquisition Agreement between the
                      Operating Partnership and CPI Piney Orchard Village
                      Center, Inc. (a Constellation affiliate) (filed as Exhibit
                      H of the Company's Schedule 14A Information on June 26,
                      1998 and incorporated herein by reference).

            10.17     Amended and Restated Registration Rights Agreement dated
                      March 16, 1998 for the benefit of certain shareholders of
                      the Company.

            27.1      Financial Data Schedule.

            99.1      Press release dated May 15, 1998 regarding the Company's
                      entrance into a series of agreements through affiliates of
                      the Operating Partnership with Constellation and certain
                      Constellation affiliates to acquire real estate properties
                      and service businesses (filed with the Company's Current
                      Report on Form 8-K on May 29, 1998 and incorporated herein
                      by reference).

            99.2      Press release dated August 12, 1998 regarding the
                      Company's earnings for the period ended June 30, 1998
                      (filed with the Company's Current Report on Form 8-K on
                      August 12, 1998 and incorporated herein by reference).
</TABLE>


(b)   Reports on Form 8-K

During the three months ended June 30, 1998 and through August 7, 1998 the
Company filed the following:

    i. a Current Report of Form 8-K filed May 15, 1998 (Reporting under Items 2
       and 7) regarding the Company's acquisition through affiliates of the
       Operating Partnership of nine multistory office buildings and three
       office/flex buildings located in the Baltimore/Washington corridor
       adjacent to BWI Airport in Linthicum, Anne Arundel County, Maryland.

    ii.a Current Report of Form 8-K filed May 29, 1998 (Reporting under Items 5
       and 7) regarding the Company's entrance into a series of agreements
       through affiliates of the Operating Partnership with Constellation and
       certain Constellation affiliates to acquire real estate properties and
       service businesses.

    iii. a Current Report of Form 8-K filed June 10, 1998 (Reporting under Items
       2, 5 and 7) regarding the Company's acquisition through affiliates of the
       Operating Partnership of two multistory office buildings located in
       Fairfield, New Jersey and the Company's procurement of a $100,000 secured
       credit facility.

    iv.a Current Report of Form 8-KA filed July 7, 1998 (Amending Items 2 and 7
       as originally filed) regarding the Company's acquisition through
       affiliates of the Operating Partnership of two multistory office
       buildings located in Fairfield, New Jersey.

    v. a Current Report of Form 8-KA filed July 7, 1998 (Amending Items 2 and 7
       as originally filed) regarding the Company's acquisition through
       affiliates of the Operating Partnership of nine multistory office
       buildings and three office/flex buildings located in the
       Baltimore/Washington corridor adjacent to BWI Airport in Linthicum, Anne
       Arundel County, Maryland.


                                       16
<PAGE>

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Act of
1934, the Company has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.


                                CORPORATE OFFICE PROPERTIES TRUST


Date August 12, 1998           By: /s/ Clay W. Hamlin, III
                                   -----------------------
                                   Clay W. Hamlin, III
                                   President and Chief Executive Officer
                                   (Principal Executive Officer)


Date August 12, 1998           By: /s/ Thomas D. Cassel
                                   --------------------
                                   Thomas D. Cassel
                                   Vice President - Finance and Treasurer
                                   (Principal Financial and Accounting Officer)


                                       17

<PAGE>


                                                                    EXHIBIT 2.4
                          CORPORATE OFFICE PROPERTIES, L.P.

                  AMENDED AND RESTATED LIMITED PARTNERSHIP AGREEMENT











THESE SECURITIES ARE SUBJECT TO RESTRICTIONS ON TRANSFERABILITY AND RESALE 
AND MAY NOT BE TRANSFERRED OR RESOLD EXCEPT AS PERMITTED UNDER THE SECURITIES 
ACT OF 1933, AS AMENDED, AND THE APPLICABLE STATE SECURITIES LAWS PURSUANT TO 
A REGISTRATION OR EXEMPTION THEREFROM.

<PAGE>

                                  TABLE OF CONTENTS

                                                                           Page

 

ARTICLE I - INTERPRETIVE PROVISIONS. . . . . . . . . . . . . . . . . . . . .  1

     SECTION 1.1  Certain Definitions. . . . . . . . . . . . . . . . . . . .  1
     SECTION 1.2  Rules of Construction. . . . . . . . . . . . . . . . . . . 12

ARTICLE II - CONTINUATION. . . . . . . . . . . . . . . . . . . . . . . . . . 12

     SECTION 2.1  Continuation . . . . . . . . . . . . . . . . . . . . . . . 12
     SECTION 2.2  Name . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
     SECTION 2.3  Place of Business; Registered Office; Registered Agent.. . 13

ARTICLE III - BUSINESS PURPOSE . . . . . . . . . . . . . . . . . . . . . . . 13

     SECTION 3.1  Business . . . . . . . . . . . . . . . . . . . . . . . . . 13
     SECTION 3.2  Authorized Activities. . . . . . . . . . . . . . . . . . . 13

ARTICLE IV - CAPITAL CONTRIBUTION. . . . . . . . . . . . . . . . . . . . . . 13

     SECTION 4.1  Capital Contributions. . . . . . . . . . . . . . . . . . . 13
     SECTION 4.2  Additional Partnership Interests . . . . . . . . . . . . . 14
     SECTION 4.3  No Third Party Beneficiaries . . . . . . . . . . . . . . . 15
     SECTION 4.4  Capital Accounts . . . . . . . . . . . . . . . . . . . . . 15
     SECTION 4.5  Return of Capital Account; Interest. . . . . . . . . . . . 17
     SECTION 4.6  Preemptive Rights. . . . . . . . . . . . . . . . . . . . . 17

ARTICLE V - ALLOCATIONS AND DISTRIBUTIONS. . . . . . . . . . . . . . . . . . 17

     SECTION 5.1  Limited Liability. . . . . . . . . . . . . . . . . . . . . 17
     SECTION 5.2  Profits, Losses and Distributive Shares. . . . . . . . . . 17
     SECTION 5.3  Distributions. . . . . . . . . . . . . . . . . . . . . . . 23
     SECTION 5.4  Distributions upon Liquidation . . . . . . . . . . . . . . 24
     SECTION 5.5  Amounts Withheld . . . . . . . . . . . . . . . . . . . . . 24
     SECTION 5.6  Restricted Distributions.. . . . . . . . . . . . . . . . . 24

ARTICLE VI - PARTNERSHIP MANAGEMENT. . . . . . . . . . . . . . . . . . . . . 25

     SECTION 6.1  Management and Control of Partnership Business . . . . . . 25
     SECTION 6.2  No Management by Limited Partners; Limitation of
               Liability . . . . . . . . . . . . . . . . . . . . . . . . . . 25
     SECTION 6.3  Limitations on Partners. . . . . . . . . . . . . . . . . . 26
     SECTION 6.4  Business with Affiliates . . . . . . . . . . . . . . . . . 26
     SECTION 6.5  Compensation; Reimbursement of Expenses. . . . . . . . . . 27

                                          i
<PAGE>


                                                                            Page

     SECTION 6.6  Liability for Acts and Omissions . . . . . . . . . . . . . 27
     SECTION 6.7  Indemnification. . . . . . . . . . . . . . . . . . . . . . 28

ARTICLE VII - ADMINISTRATIVE, FINANCIAL AND TAX MATTERS. . . . . . . . . . . 28

     SECTION 7.1  Books and Records. . . . . . . . . . . . . . . . . . . . . 28
     SECTION 7.2  Annual Audit and Accounting. . . . . . . . . . . . . . . . 29
     SECTION 7.3  Partnership Funds. . . . . . . . . . . . . . . . . . . . . 29
     SECTION 7.4  Reports and Notices. . . . . . . . . . . . . . . . . . . . 29
     SECTION 7.5  Tax Matters. . . . . . . . . . . . . . . . . . . . . . . . 29
     SECTION 7.6  Withholding. . . . . . . . . . . . . . . . . . . . . . . . 30

ARTICLE VIII -  TRANSFER OF PARTNERSHIP INTERESTS; ADMISSION OF PARTNERS . . 31

     SECTION 8.1  Transfer by General Partner. . . . . . . . . . . . . . . . 31
     SECTION 8.2  Obligations of a Prior General Partner . . . . . . . . . . 31
     SECTION 8.3  Successor General Partner. . . . . . . . . . . . . . . . . 31
     SECTION 8.4  Restrictions on Transfer and Withdrawal by Limited
               Partner.. . . . . . . . . . . . . . . . . . . . . . . . . . . 31
     SECTION 8.5  Substituted Limited Partner. . . . . . . . . . . . . . . . 33
     SECTION 8.6  Timing and Effect of Transfers . . . . . . . . . . . . . . 33
     SECTION 8.7  Additional Limited Partners. . . . . . . . . . . . . . . . 34
     SECTION 8.8  Amendment of Agreement and Certificate . . . . . . . . . . 34
     SECTION 8.9  Pledges. . . . . . . . . . . . . . . . . . . . . . . . . . 34

ARTICLE IX REDEMPTION AND CONVERSION . . . . . . . . . . . . . . . . . . . . 34

     SECTION 9.1  Right of Redemption. . . . . . . . . . . . . . . . . . . . 34
     SECTION 9.2  Timing of Redemption . . . . . . . . . . . . . . . . . . . 35
     SECTION 9.3  Redemption Price . . . . . . . . . . . . . . . . . . . . . 35
     SECTION 9.4  Assumption of Redemption Obligation. . . . . . . . . . . . 35
     SECTION 9.5  Further Assurances; Certain Representations. . . . . . . . 35
     SECTION 9.6  Effect of Redemption . . . . . . . . . . . . . . . . . . . 36
     SECTION 9.7  Registration Rights. . . . . . . . . . . . . . . . . . . . 36
     SECTION 9.8  Conversion . . . . . . . . . . . . . . . . . . . . . . . . 36
     SECTION 9.9  Redemption Restriction.. . . . . . . . . . . . . . . . . . 37
     SECTION 9.10  Special Event.. . . . . . . . . . . . . . . . . . . . . . 37

ARTICLE X - DISSOLUTION AND LIQUIDATION. . . . . . . . . . . . . . . . . . . 38

     SECTION 10.1  Term and Dissolution. . . . . . . . . . . . . . . . . . . 38
     SECTION 10.2  Liquidation of Partnership Assets.. . . . . . . . . . . . 39
     SECTION 10.3  Effect of Treasury Regulations. . . . . . . . . . . . . . 40
     SECTION 10.4  Time for Winding-Up . . . . . . . . . . . . . . . . . . . 41

ARTICLE XI - AMENDMENTS AND MEETINGS . . . . . . . . . . . . . . . . . . . . 41

                                          ii
<PAGE>


                                                                            Page
     SECTION 11.1  Amendment Procedure . . . . . . . . . . . . . . . . . . . 41
     SECTION 11.2  Meetings and Voting . . . . . . . . . . . . . . . . . . . 42

ARTICLE XII - MISCELLANEOUS PROVISIONS . . . . . . . . . . . . . . . . . . . 43

     SECTION 12.1  Title to Property . . . . . . . . . . . . . . . . . . . . 43
     SECTION 12.2  Other Activities of Limited Partners and Preferred
               Limited Partners. . . . . . . . . . . . . . . . . . . . . . . 43
     SECTION 12.3  Power of Attorney . . . . . . . . . . . . . . . . . . . . 43
     SECTION 12.4  Notices . . . . . . . . . . . . . . . . . . . . . . . . . 44
     SECTION 12.5  Further Assurances. . . . . . . . . . . . . . . . . . . . 45
     SECTION 12.6  Titles and Captions . . . . . . . . . . . . . . . . . . . 45
     SECTION 12.7  Applicable Law. . . . . . . . . . . . . . . . . . . . . . 45
     SECTION 12.8  Binding Agreement . . . . . . . . . . . . . . . . . . . . 45
     SECTION 12.9  Waiver of Partition . . . . . . . . . . . . . . . . . . . 45
     SECTION 12.10 Counterparts and Effectiveness. . . . . . . . . . . . . . 45
     SECTION 12.11 Survival of Representations . . . . . . . . . . . . . . . 45
     SECTION 12.12 Entire Agreement. . . . . . . . . . . . . . . . . . . . . 45
     SECTION 12.13 Temporary Allocation. . . . . . . . . . . . . . . . . . . 45
     SECTION 12.14 Authorization and Consent . . . . . . . . . . . . . . . . 46
     SECTION 12.15  Merger . . . . . . . . . . . . . . . . . . . . . . . . . 46

Exhibit 1- . . Schedule of Partners
Exhibit 2- . . Form of Redemption or Conversion Notice
Exhibit 3- . . Form of Registration Rights Agreement


<PAGE>

                          CORPORATE OFFICE PROPERTIES, L.P.

                  AMENDED AND RESTATED LIMITED PARTNERSHIP AGREEMENT

                    The undersigned, being the sole general partner and the 
initial Limited Partners of CORPORATE OFFICE PROPERTIES, L.P. (the 
"Partnership"), a limited partnership formed under the Delaware Revised 
Uniform Limited Partnership Act, do hereby enter into this Partnership 
Agreement as of this 16th day of March 1998.

                                   R E C I T A L S:

                    A.   The Partnership was formed pursuant to a Certificate 
of Limited Partnership filed on October 10, 1997 with the Secretary of State 
of the State of Delaware under the name "FCO, L.P." following the execution 
of a Limited Partnership Agreement dated October 14, 1997 (the "Original 
Partnership Agreement") among the General Partner's predecessor and the 
initial Limited Partners.  

                    B.   The Partnership changed its name to Corporate Office 
Property, L.P. as of January 1, 1998.

                    C.   The General Partner was reformed as a Maryland real 
estate investment trust on the date hereof.

                    D.   The General Partner, the Limited Partners and the 
Preferred Limited Partners desire to set forth the understandings and 
agreements, including certain rights and obligations, among the Partners (as 
hereinafter defined) with respect to the Partnership.  This Agreement amends, 
restates and supersedes the Original Partnership Agreement in its entirety.

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

                         ARTICLE I - INTERPRETIVE PROVISIONS

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

                    SECTION 1.1  Certain Definitions.  The following terms 
have the definitions hereinafter indicated whenever used in this Agreement 
with initial capital letters:

                    Act:  The Delaware Revised Uniform Limited Partnership 
Act, Sections 17-101 to 17 -1111 of the Delaware Code, Title 6, as amended 
from time to time.

                    Additional Limited Partner/Preferred Limited Partner:  A 
Person admitted to the Partnership as a Limited Partner or Preferred Limited 
Partner in accordance with Section 8.7 hereof and who is shown as such on the 
books and records of the Partnership in such Person's capacity as a limited 
partner of the Partnership.

<PAGE>

                                          2

                    Adjusted Capital Account:  With respect to any Partner, 
such Partner's Capital Account maintained in accordance with Section 4.4 
hereof, as of the end of the relevant Fiscal Year of the Partnership, after 
giving effect to the following adjustments:

                    (A)  Credit to such Capital Account such Partner's share 
of Partnership Minimum Gain determined in accordance with Treasury 
Regulations Section 1.704-2(g)(1) and such Partner's share of Partner Minimum 
Gain determined in accordance with Treasury Regulations Section 1.7042(i)(5).

                    (B)  Debit to such Capital Account the items described in 
Treasury Regulations Section 1.704-1(b)(2)(ii)(d)(4), (5) and (6).

                    The foregoing definition of "Adjusted Capital Account" is 
intended to comply with the provisions of Treasury Regulations Sections 
1.704-1(b)(2)(ii) and 1.704-2 and shall he interpreted consistently therewith.

                    Adjusted Capital Account Deficit:  With respect to any 
Partner, the deficit balance, if any, in that Partner's Adjusted Capital 
Account as of the end of the relevant Fiscal Year of the Partnership.

                    Affiliate:  With respect to any referenced Person, (i) a 
member of such Person's immediate family; (ii) any Person who directly or 
indirectly owns, controls or holds the power to vote ten percent (10%) or 
more of the outstanding voting interests or securities of the Person in 
question; (iii) any Person ten percent (10%) or more of whose outstanding 
interests or securities are directly or indirectly owned, controlled, or held 
with power to vote by the Person in question; (iv) any Person directly or 
indirectly controlling, controlled by, or under direct or indirect common 
control with the Person in question; (v) if the Person in question is a 
corporation, any executive officer or director of such Person or of any 
corporation directly or indirectly controlling such Person: and (vi) if the 
Person in question is a partnership, any general partner of the partnership 
or any limited partner owning or controlling ten percent (10%) or more of 
either the capital or profits interest in such partnership.  As used herein, 
"control" shall mean the possession, directly or indirectly, of the power to 
direct or cause the direction of the management and policies of a Person, 
whether through the ownership of voting securities, by contract, or otherwise.

                    Agreed Value:  In the case of any (i) Contributed 
Property acquired pursuant to a Contribution Agreement, the value of such 
Contributed Property as set forth in or determined pursuant to such 
Contribution Agreement or, if no such value is set forth or determined for 
such Contributed Property, the portion of the consideration provided for 
under such Contribution Agreement allocable to such Contributed Property, as 
determined by the General Partner in its reasonable discretion, (ii) 
Contributed Property acquired other than pursuant to a Contribution 
Agreement, the fair market value of such property at the time of 
contribution, as determined by the General Partner using such method of 
valuation as it may adopt in its reasonable discretion and (iii) property 
distributed to a Partner by the Partnership, the Partnership's Book Value of 
such property at the time such property is distributed without taking into 
account, in the case of each of (i), (ii) and (iii), the amount of any re-

<PAGE>

                                          3

lated indebtedness assumed by the Partnership (or the Partner in the case of 
clause (iii)) or to which the Contributed Property is taken subject.

                    Agreement:  This Limited Partnership Agreement and all 
Exhibits attached hereto, as the same may be amended or restated and in 
effect from time to time which are hereby incorporated by reference and made 
a part of this Agreement.

                    Assignee:  Any Person to whom one or more Partnership 
Units or Preferred Units have been Transferred as permitted under this 
Agreement but who has not become a Substituted Limited Partner/Preferred 
Limited Partner in accordance with the provisions hereof.

                    Bankruptcy:  Either (i) a referenced Person's making an 
assignment for the benefit of creditors, (ii) the filing by a referenced 
Person of a voluntary petition in bankruptcy, (iii) a referenced Person's 
being adjudged insolvent or having entered against such referenced Person an 
order for relief in any bankruptcy or insolvency proceeding, (iv) the filing 
by a referenced Person of an answer seeking any reorganization, composition, 
readjustment, liquidation, dissolution, or similar relief under any law or 
regulation, (v) the filing by a referenced Person of an answer or other 
pleading admitting or failing to contest the material allegations of a 
petition filed against such referenced Person in any proceeding of 
reorganization, composition, readjustment, liquidation, dissolution, or for 
similar relief under any statute, law or regulation or (vi) a referenced 
Person's seeking, consenting to, or acquiescing in the appointment of a 
trustee, receiver or liquidator for all or substantially all of such 
referenced Person's property (or court appointment of such trustee, receiver 
or liquidator).  The foregoing is intended to supersede the events listed in 
Section 17-402(a)(4) and (5) of the Act.  

                    Book-Tax Disparity:  With respect to any item of 
Contributed Property, or property the Book Value of which has been adjusted 
in accordance with Section 4.4(D), as of the date of determination, the 
difference between the Book Value of such property and the adjusted basis of 
such property for federal income tax purposes.

                    Book Value:  With respect to any Contributed Property, 
the Agreed Value of such property reduced (but not below zero) by all 
Depreciation with respect to such property properly charged to the Partners' 
Capital Accounts and with respect to any other asset, the asset's adjusted 
basis for federal income tax purposes; provided, however, (a) the Book Value 
of all Partnership Assets shall be adjusted in the event of a revaluation of 
Partnership Assets in accordance with Section 4.4(D) hereof, (b) the Book 
Value of any Partnership Asset distributed to any Partner shall be the fair 
market value of such asset on the date of distribution as determined by the 
General Partner and (c) such Book Value shall be adjusted by the Depreciation 
taken into account with respect to such asset for purposes of computing 
Profits and Losses.

                    Capital Account:  The account maintained by the 
Partnership for each Partner described in Section 4.4 hereof.

                    Capital Contribution:  The total amount of cash or cash 
equivalents and the Agreed Value (reduced to take into account the amount of 
any related indebtedness assumed by the Partner

<PAGE>

                                          4

ship, or to which the Contributed Property is subject) of Contributed 
Property which a Partner contributes or is deemed to contribute to the 
Partnership pursuant to the terms of this Agreement.

                    Cash Payment:  The payment to a Redeeming Party of a cash 
amount determined by multiplying (i) the number of Partnership Units tendered 
for redemption by such Redeeming Party pursuant to a validly proffered 
Redemption Notice by (ii) the Unit Value with respect to such Partnership 
Units.

                    Certificate:  The Partnership's Certificate of Limited 
Partnership filed in the office of the Secretary of State of the State of 
Delaware, as amended from time to time.

                    Code:  The Internal Revenue Code of 1986, as amended from 
time to time.

                    Consent:  Either the written consent of a Person or the 
affirmative vote of such Person at a meeting duly called and held pursuant to 
this Agreement, as the case may be, to do the act or thing for which the 
consent or vote is required or solicited, or the act of granting such consent 
or vote, as the context may require.

                    Contributed Property:  Each property or other asset 
(excluding cash and cash equivalents) contributed or deemed contributed to 
the Partnership (whether as a result of a Code Section 708 termination or 
otherwise).  For the avoidance of doubt, the properties and assets held by 
the partnership constituting the Contributed Interests (as defined in the 
Formation Agreement) shall constitute Contributed Properties to the extent 
the Contributed Interests are acquired by the Partnership.

                    Contribution Agreements:  Those certain agreements among 
one or more of the Initial Limited Partners (or Persons in which such Initial 
Limited Partners have direct or indirect interests) and the Partnership 
pursuant to which, inter alia, the Initial Limited Partners (or such 
Persons), directly or indirectly contributed property to the Partnership on 
October 14, 1997 in exchange for Partnership Units or Preferred Units or are 
to contribute property to the Partnership in exchange for Partnership Units 
or Preferred Units including, without limitation, the Formation Agreement.

                    Conversion Factor:  The factor (carried out to four 
decimal places) applied for converting Partnership Units to REIT Shares, 
which shall initially be 1.0; provided, however, in the event that on or 
after the date of this Agreement the General Partner (i) declares or pays a 
dividend on its outstanding REIT Shares in REIT Shares or makes a 
distribution to all holders of its outstanding REIT Shares in REIT Shares, 
(ii) subdivides its outstanding REIT Shares or (iii) combines its outstanding 
REIT Shares into a 

<PAGE>

                                          5

smaller number of REIT Shares, the Conversion Factor shall be adjusted by 
multiplying the Conversion Factor by a fraction, the numerator of which shall 
be the number of REIT Shares issued and outstanding on the record date 
(assuming for such purposes that such dividend, distribution, subdivision or 
combination has occurred as of such time), and the denominator of which shall 
be the actual number of REIT Shares (determined without the above assumption) 
issued and outstanding on the record date for such dividend, distribution, 
subdivision or combination; provided, further, in the event that the 
Partnership (a) declares or pays a distribution on the outstanding 
Partnership Units in Partnership Units or makes a distribution to all 
Partners in Partnership Units, (b) subdivides the outstanding Partnership 
Units or (c) combines the outstanding Partnership Units into a smaller number 
of Partnership Units, the Conversion Factor shall be adjusted by multiplying 
the Conversion Factor by a fraction, the numerator of which shall be the 
actual number of Partnership Units issued and outstanding on the record date 
(determined without giving effect to such dividend, distribution, subdivision 
or combination), and the denominator of which shall be the actual number of 
Partnership Units (determined after giving effect to such dividend, 
distribution, subdivision or combination) issued and outstanding on such 
record date.  Any adjustment to the Conversion Factor shall become effective 
immediately after the effective date of such event retroactive to the record 
date, if any, for such event.

                    COPT:  Corporate Office Properties Trust, a Maryland real 
estate investment trust.

                    Depreciation:  For each Fiscal Year or other period, an 
amount equal to the depreciation, amortization or other cost recovery 
deduction allowable with respect to an asset for such year or other period, 
except that if the Book Value of an asset differs from its adjusted basis for 
federal income tax purposes at the beginning of such year or other period, 
Depreciation shall be adjusted as necessary so as to be an amount which bears 
the same ratio to such beginning Book Value as the federal income tax 
depreciation, amortization, or other cost recovery deduction for such year or 
other period bears to the beginning adjusted tax basis; provided, however, 
that if the federal income tax depreciation, amortization or other cost 
recovery deduction for such year or other period is zero, Depreciation for 
such year or other period shall be determined with reference to such 
beginning Book Value using any reasonable method approved by the General 
Partner.

                    Distributable Cash:  with respect to any period, and 
without duplication:

               (i)  all cash receipts of the Partnership during such period 
from all sources;

               (ii) less all cash disbursements of the Partnership during 
such period. including, without limitation, disbursements for operating 
expenses, taxes, debt service (including, without limitation, the payment of 
principal, premium and interest), redemption of Partnership Interests and 
capital expenditures;

               (iii)     less amounts added to reserves in the reasonable 
discretion of the General Partner;

               (iv) plus amounts withdrawn from reserves in the reasonable 
discretion of the General Partner.

                    Distribution Period:  The quarterly period commencing on 
January 1, April 1, July 1 and October 1 of each year and ending on and 
including the day preceding the next Distribution Period Commencement Date 
with respect to the Preferred Units.

                    ERISA:  The Employee Retirement Income Security Act of 
1976, as amended from time to time.

<PAGE>

                                          6

                    Fiscal Year:  The calendar year or such other twelve (12) 
month period designated by the General     Partner.

                    Formation Agreement:  The Formation/Contribution 
Agreement dated as of September 7, 1997 by and among Royale, H/SIC 
Corporation, Strategic Facility Investors, Inc., South Brunswick Investment 
Company, LLC, Comcourt Investment Corporation, Gateway Shannon Development 
Corporation, Crown Advisors, Inc., Vernon R. Beck and John Parsinen, as the 
same has heretofore been and hereafter may at any time be amended, modified 
and supplemented and in effect.

                    General Partner:  COPT, and its respective successor(s) 
who or which become Successor General Partner(s) in accordance with the terms 
of this Agreement, in its capacity as general partner of the Partnership.

                    General Partner Interest:  A Partnership Interest held by 
the General Partner that is a general partner interest.  A General Partner 
Interest may be expressed as a number of Partnership Units.

                    Involuntary Withdrawal:  As to any (i) individual shall 
mean such individual's death, incapacity or adjudication of incompetence, 
(ii) corporation shall mean its dissolution or revocation of its charter 
(unless such revocation is promptly corrected upon notice thereof), (iii) 
partnership shall mean the dissolution and commencement of winding up of its 
affairs, (iv) trust shall mean the termination of the trust (but not the 
substitution of trustees), (v) estate shall mean the distribution by the 
fiduciary of the estate's complete interest in the Partnership and (vi) 
Partner shall mean the Bankruptcy of such Partner.

                    IRS:  The Internal Revenue Service, which administers the 
internal revenue laws of the United States.

                    Limited Partner:  Those Persons listed as such on Exhibit 
1 attached hereto and made a part hereof, as such Exhibit may be amended from 
time to time, including any Person who becomes a Substituted Limited Partner 
or an Additional Limited Partner in accordance with the terms of this 
Agreement in such Person's capacity as a limited partner of the Partnership; 
provided, however, that such term shall not include the Preferred Limited 
Partners.

                    Limited Partner Interest:  A Partnership Interest held by 
a Limited Partner that is a limited partner interest.  A Limited Partner 
Interest may be expressed as a number of Partnership Units.

                    Nonrecourse Liability:  A liability as defined in 
Treasury Regulations Section 1.704-2(b)(3).

                    Notice:  A writing containing the information required by 
this Agreement to be communicated to a Person and delivered to such Person in 
accordance with Section 12.4; provided, however, that any written 
communication containing such information actually received by such Person 
shall constitute Notice for all purposes of this Agreement.

<PAGE>

                                          7

                    Partner Minimum Gain:  The gain (regardless of character) 
which would be realized by the Partnership if property of the Partnership 
subject to a partner nonrecourse debt (as such term is defined in Treasury 
Regulation Section 1.704-2(b)(4)) were disposed of in full satisfaction of 
such debt on the relevant date.  The adjusted basis of property subject to 
more than one partner nonrecourse debt shall be allocated in a manner 
consistent with the allocation of basis for purposes of determining 
Partnership Minimum Gain hereunder.  Partner Minimum Gain shall be computed 
hereunder using the Book Value, rather than the adjusted tax basis, of the 
Partnership property in accordance with Treasury Regulations Section 
1.704-2(d)(3).

                    Partner Nonrecourse Deductions:  With respect to any 
partner nonrecourse debt (as such term is defined in Treasury Regulation 
Section 1.704-2(b)(4)), the increase in Partner Minimum Gain during the tax 
year plus any increase in Partner Minimum Gain for a prior tax year which has 
not previously generated a Partner Nonrecourse Deduction hereunder.  The 
determination of which Partnership items constitute Partner Nonrecourse 
Deductions shall be made in a manner consistent with the manner in which 
Partnership Nonrecourse Deductions are determined hereunder.

                    Partners:  The General Partner, the Preferred Limited 
Partners and the Limited Partners as a group.  The term "Partner" shall mean 
a General Partner, a Preferred Limited Partner or a Limited Partner.  Such 
terms shall be deemed to include such other Persons who become Partners 
pursuant to the terms of this Agreement.

                    Partnership:  The Delaware limited partnership referred 
to herein as CORPORATE OFFICE PROPERTIES, L.P., as such partnership may from 
time to time be constituted.

                    Partnership Assets:  At any particular time, any assets 
or property (real or personal, tangible or intangible, choate or inchoate, 
fixed or contingent) owned by the Partnership.

                    Partnership Interest or Interest:  As to any Partner, 
such Partner's ownership interest in the Partnership and including such 
Partner's right to distributions under this Agreement and any other rights or 
benefits which such Partner has in the Partnership, together with any and all 
obligations of such Person to comply with the terms and provisions of this 
Agreement.  A Partnership Interest may be expressed as a number of 
Partnership Units or Preferred Units.

                    Partnership Minimum Gain:  The aggregate gain (regardless 
of character) which would be realized by the Partnership if all of the 
property of the Partnership subject to nonrecourse debt (other than partner 
nonrecourse debt as such term is defined in Treasury Regulations Section 
1.704-2(b)(4)) were disposed of in full satisfaction of such debt and for no 
other consideration on the relevant date.  In the case of any Nonrecourse 
Liability of the Partnership which is not secured by a mortgage with respect 
to any specific property of the Partnership, any and all property of the 
Partnership to which the holder of said liability has recourse shall be 
treated as subject to such Nonrecourse Liability for purposes of the 
preceding sentence.  Partnership Minimum Gain shall be computed separately 
for each Nonrecourse Liability of the Partnership.  For this purpose, the 
adjusted basis of property subject to two 

<PAGE>

                                          8

or more liabilities of equal priority shall be allocated among such 
liabilities in proportion to the outstanding balance of such liabilities, and 
the adjusted basis of property subject to two or more liabilities of unequal 
priority shall be allocated to the liability of inferior priority only to the 
extent of the excess, if any, of the adjusted basis of such property over the 
outstanding balance of the liability of superior priority.  Partnership 
Minimum Gain shall be computed hereunder using the Book Value, rather than 
the adjusted tax basis, of the Partnership property in accordance with 
Treasury Regulations Section 1.704-2(d)(3).

                    Partnership Nonrecourse Deductions:  The amount of 
Partnership deductions equal to the increase, if any, in the amount of the 
aggregate Partnership Minimum Gain during the tax year (plus any increase in 
Partnership Minimum Gain for a prior tax year which has not previously 
generated a Partnership Nonrecourse Deduction) reduced (but not below zero) 
by the aggregate distributions made during the tax year of the proceeds of a 
Nonrecourse Liability of the Partnership which are attributable to an 
increase in Partnership Minimum Gain within the meaning of Treasury 
Regulations Section 1.704-2(d). The Partnership Nonrecourse Deductions for a 
Partnership tax year shall consist first of depreciation or cost recovery 
deductions with respect to each property of the Partnership giving rise to 
such increase in Partnership Minimum Gain on a pro rata basis to the extent 
of each such increase, with any excess made up pro rata of all items of 
deduction.

                    Partnership Unit:  A fractional, undivided share of the 
Partnership Interests of all Partners (other than the Preferred Limited 
Partners) issued pursuant to Section 4.1 hereof.

                    Percentage Interest:  As to any Partner (other than the 
Preferred Limited Partners), the percentage in the Partnership, as determined 
by dividing the Partnership Units then owned by such Partner by the total 
number of Partnership Units then outstanding, as the same may be 
automatically adjusted from time to time to reflect the issuance and 
redemption of Partnership Units in accordance with this Agreement, without 
requiring the amendment of Exhibit 1 to reflect any such issuance or 
redemption.

                    Person:  Any individual, partnership, limited liability 
company, corporation, trust or other entity.

                    Preferred Conversion:  As described in Section 9.8 hereof.

                    Preferred Limited Partner:  Those Persons listed as such 
on Exhibit 1 attached hereto and made a part hereof, as such Exhibit 1 may be 
amended from time to time, in their capacity as limited partners in the 
Partnership holding Preferred Units, including any Person who becomes a 
Substituted Preferred Limited Partner or an Additional Preferred Limited 
Partner in accordance with the terms of this Agreement.

                    Preferred Unit:  The Partnership Interest held by a 
Preferred Limited Partner that is a preferred limited partner interest in the 
Partnership.

                    Priority Return Amount:  For each Distribution Period, an 
amount equal to 1.625% of that portion of the Capital Contribution of the 
Preferred Limited Partner allocable to each Preferred Unit held by such 
Preferred Limited Partner.

<PAGE>

                                          9

                    Profits and Losses:  For each Fiscal Year or other 
period, an amount equal to the Partnership's taxable income or loss (as the 
case may be) for such year or period, determined in accordance with Code 
Section 703(a) (for this purpose, all items of income, gain, loss or 
deduction required to be stated separately pursuant to Code Section 703(a)(1) 
shall be included in taxable income or loss), with the following adjustments:

                   (i)  Any income of the Partnership that is exempt from 
federal income tax and not otherwise taken into account in computing Profits 
or Losses pursuant to this definition shall be added to such taxable income 
or loss;

                   (ii)  Any expenditures of the Partnership described in 
               Code Section 705(a)(2)(B) or treated as Code Section 
               705(a)(2)(B) expenditures pursuant to Treasury Regulations 
               Section 1.704-1(b)(2)(iv)(i), and not otherwise taken into
               account in computing Profits or Losses pursuant to this 
               definition, shall be subtracted from such taxable income or
               loss;

                   (iii)  Gain or loss resulting from any disposition of 
               Partnership property with respect to which gain or loss is 
               recognized for federal income tax purposes shall be computed
               by reference to the Book Value of the property disposed of
               notwithstanding that the adjusted tax basis of such property 
               differs from such Book Value;

                   (iv)  In lieu of the depreciation, amortization, and other
               cost recovery deductions taken into account in computing such
               taxable income or loss, there shall be taken into account 
               Depreciation for such Fiscal Year or other period, computed in
               accordance with the definition of "Depreciation" herein; and

                   (v)  In the event that any item of income, gain, loss or 
               deduction that has been included in the initial computation 
               of Profit or Loss is subject to the special allocation rules of
               Sections 5.2(C) and 5.2(D), Profit or Loss shall be recomputed 
               without regard to such item.

                    Recourse Liabilities:  The amount of liabilities owed by 
the Partnership (other than nonrecourse liabilities and liabilities to which 
Partner Nonrecourse Deductions are attributable in accordance with Treasury 
Regulations Section 1.704-2(i)).

                    Redeeming Party:  A Limited Partner or Assignee (other 
than the General Partner) who tenders Partnership Units for redemption 
pursuant to a Redemption Notice.

                    Redemption Date:  The date for redemption of Partnership 
Units as set forth in Section 9.2.

                    Redemption Notice:  A Notice to the General Partner by a 
Redeeming Party, substantially in the form attached as Exhibit 2, pursuant to 
which the Redeeming Party requests the redemption of Partnership Units in 
accordance with Article IX.

                    Redemption Obligation:  The obligation of the Partnership 
to redeem the Partnership Units as set forth in Section 9. 1 (A).

<PAGE>

                                          10

                    Redemption Period:  The 45-day period immediately 
following the filing with the SEC by the General Partner of an annual report 
of the General Partner on Form 10-K or a quarterly report of the General 
Partner on Form 10-Q or such other period or periods as the General Partner 
may otherwise determine fom time to time.

                    Redemption Price:  As defined in Section 9.3 hereof.

                    Redemption Restriction:  A restriction on the ability of 
the Partnership to redeem the Partnership Units as set forth in Section 9. 1 
(A).

                    Registration Rights Agreement:  An Amended and Restated 
Registration Rights Agreement, substantially in the form of Exhibit 3 hereto, 
pursuant to which COPT will agree, among other things, to register under the 
Securities Act of 1933, as amended, REIT Shares issued in connection with 
Share Payments made under Article IX hereof.

                    REIT:  A real estate investment trust, as defined in Code 
Section 856.

                    REIT Charter:  The Amended and Restated Declaration of 
Trust of COPT filed with the  State Department of Assessments and Taxation of 
Maryland on March 3, 1998, as the same may have heretofore or may hereafter 
be amended or restated and in effect from time to time.

                    REIT Share:  A common share of beneficial interest 
representing an ownership interest in the General Partner.

                    REIT Share Rights:  Rights to acquire additional REIT 
Shares issued to all holders of REIT Shares, whether in the form of rights, 
options, warrants or convertible or exchangeable securities, to the extent 
the same have been issued without additional consideration after the initial 
acquisition of such REIT Shares.

                    SEC:  The Securities and Exchange Commission.

                    Share Payment:  The payment to a Redeeming Party of a 
number of REIT Shares determined by multiplying (i) the number of Partnership 
Units tendered for redemption by such Redeeming Party pursuant to a validly 
proffered Redemption Notice by (ii) the Conversion Factor.  In the event the 
General Partner grants any REIT Share Rights on or after the date of this 
Agreement and prior to such payment, any Share Payment shall include for the 
Redeeming Party such Redeeming Party's ratable share of such REIT Share 
Rights other than REIT Share Rights which have expired.

                    Subsidiary:  With respect to any Person, any corporation 
or other entity of which a majority of (i) the voting power of the voting 
equity securities or (ii) the outstanding equity interests is owned, directly 
or indirectly, by such Person.

                    Substituted Limited Partner/Preferred Limited Partner:  
That Person or those Persons admitted to the Partnership as a substitute 
Limited Partner or substitute Preferred Limited Partner, in accordance with 
the provisions of this Agreement, in such Person's capacity as a limited 

<PAGE>

                                          11

partner of the Partnership.  A Substituted Limited Partner or Substituted 
Preferred Limited Partner, upon admission as such, shall succeed to the 
rights, privileges and liabilities of the predecessor in interest as a 
Limited Partner or Preferred Limited Partner.

                    Successor General Partner:  Any Person who is admitted to 
the Partnership as substitute General Partner pursuant to this Agreement, it 
its capacity as a general partner of the Partnership.  A Successor General 
Partner, upon its admission as such, shall succeed to the rights, privileges 
and liabilities of its predecessor in interest as General Partner, in 
accordance with the provisions of the Act.

                    Tax Matters Partner:  The General Partner or such other 
Partner who becomes Tax Matters Partner pursuant to the terms of this 
Agreement.

                    Terminating Capital Transaction:  The sale or other 
disposition of all or substantially all of the Partnership Assets or a 
related series of transactions that, taken together, result in the sale or 
other disposition of all or substantially all of the Partnership Assets.

                    Transfer:  With respect to any Partnership Interest shall 
mean a transaction in which a Partner assigns his Partnership Interest to 
another Person and includes any sale, assignment, gift, exchange or other 
disposition by law or otherwise; provided, however, the redemption of any 
Partnership Interest pursuant to Article IX hereof shall not constitute a 
"transfer" for purposes hereof.

                    Treasury Regulations:  The Income Tax Regulations 
promulgated under the Code, as such regulations may be amended from time to 
time.

                    Unit Value:  With respect to any Partnership Unit, the 
average of the daily market price for a REIT Share for the ten (10) 
consecutive trading days immediately preceding the date of receipt of a 
Redemption Notice by the General Partner multiplied by the Conversion Factor. 
 If the REIT Shares are traded on a securities exchange or the NASDAQ Small 
Cap Market or National Market System, the market price for each such trading 
day shall be the reported last sale price on such day or, if no sales take 
place on such day, the average of the closing bid and asked prices on such 
day.  If the REIT Shares are not traded on a securities exchange or the 
NASDAQ Small Cap Market or National Market System, the market price for each 
such trading day shall be determined by the General Partner using any 
reasonable method of valuation. If a Share Payment would include any REIT 
Share Rights, the value of such REIT Share Rights shall be determined by the 
General Partner using any reasonable method of valuation, taking into account 
the Unit Value determined hereunder and the factors used to make such 
determination and the value of such REIT Share Rights shall be included in 
the Unit Value.

                    SECTION 1.2  Rules of Construction.  The following rules 
of construction shall apply to this Agreement:

                    (A)  All section headings in this Agreement are for 
convenience of reference only and are not intended to qualify the meaning of 
any section.

<PAGE>

                                          12

                    (B)  All personal pronouns used in this Agreement, 
whether used in the masculine, feminine or neuter gender, shall include all 
other genders, the singular shall include the plural, and vice versa, as the 
context may require.

                    (C)  Each provision of this Agreement shall be considered 
severable from the rest, and if any provision of this Agreement or its 
application to any Person or circumstances shall be held invalid and contrary 
to any existing or future law or unenforceable to any extent, the remainder 
of this Agreement and the application of any other provision to any Person or 
circumstances shall not be affected thereby and shall be interpreted and 
enforced to the greatest extent permitted by law so as to give effect to the 
original intent of the parties hereto.

                    (D)  Unless otherwise specifically and expressly limited 
in the context, any reference herein to a decision, determination, act, 
action, exercise of a right, power or privilege, or other procedure by the 
General Partner shall mean and refer to the decision, determination, act, 
action, exercise or other procedure by the General Partner in its sole and 
absolute discretion. 
- --------------------------------------------------------------------------------

                              ARTICLE II - CONTINUATION

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

                    SECTION 2.1  Continuation.  The Partners hereby continue 
the Partnership as a limited partnership under the Act and the Persons listed 
on Exhibit I as Partners shall continue as Partners in the Partnership.  The 
General Partner shall take all action required by law to perfect and maintain 
the Partnership as a limited partnership under the Act and under the laws of 
all other jurisdictions in which the Partnership may elect to conduct 
business, including but not limited to the filing of amendments to the 
Certificate with the Delaware Secretary of State, and qualification of the 
Partnership as a foreign limited partnership in the jurisdictions in which 
such qualification shall be required, as determined by the General Partner.  
The General Partner shall also promptly register the Partnership under 
applicable assumed or fictitious name statutes or similar laws.

                    SECTION 2.2  Name.  The name of the Partnership is 
CORPORATE OFFICE PROPERTIES, L.P.  The General Partner may adopt such assumed 
or fictitious names as it deems appropriate in connection with the 
qualifications and registrations referred to in Section 2.1.

                    SECTION 2.3  Place of Business; Registered Office; 
Registered Agent.  The principal office of the Partnership is located at One 
Logan Square, Suite 1105, Philadelphia, PA  19103, which office may be 
changed to such other place as the General Partner may from time to time 
designate.  The Partnership may establish offices for the Partnership within 
or without the State of Delaware as may be determined by the General Partner. 
 The address of the Partnership's initial registered office and the initial 
registered agent for the Partnership in the State of Delaware is The 
Corporation Trust Company, whose address is c/o Corporation Trust Center, 
1209 Orange Street, Wilmington, Delaware 19801.  The Partnership's registered 
office and agent may be changed by the General Partner.

<PAGE>

                                          13

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                            ARTICLE III - BUSINESS PURPOSE

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

                    SECTION 3.1  Business.  The business of the Partnership 
shall be (i) conducting any business that may be lawfully conducted by a 
limited partnership pursuant to the Act including, without limitation, 
acquiring, owning, managing, developing, leasing, marketing, operating and, 
if and when appropriate, selling, commercial, industrial, office and net 
leased retail properties, (ii) entering into any partnership, joint venture 
or other relationship to engage in any of the foregoing or the ownership of 
interests in any entity engaged in any of the foregoing, (iii) making loans, 
guarantees, indemnities or other financial accommodations and borrowing money 
and pledging its assets to secure the repayment thereof, (iv) to do any of 
the foregoing with respect to any Affiliate or Subsidiary and (v) doing 
anything necessary or incidental to the foregoing; provided, however, that 
business of the Partnership shall be limited so as to permit the General 
Partner to elect and maintain its status as a REIT (unless the General 
Partner determines no longer to qualify as a REIT).

                    SECTION 3.2  Authorized Activities.  In carrying out the 
purposes of the Partnership, but subject to all other provisions of this 
Agreement, the Partnership is authorized to engage in any kind of lawful 
activity, and perform and carry out contracts of any kind, necessary or 
advisable in connection with the accomplishment of the purposes and business 
of the Partnership described herein and for the protection and benefit of the 
Partnership; provided that the General Partner shall not be obligated to 
cause the Partnership to take, or refraining from taking, any action which, 
in the judgment of the General Partner, (i) could adversely affect the 
ability of the General Partner to qualify and continue to qualify as a REIT, 
(ii) could subject the General Partner to additional taxes under Code Section 
857 or 4981 or (iii) could violate any law or regulation of any governmental 
body or agency having jurisdiction over the General Partner or its securities.

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

                          ARTICLE IV - CAPITAL CONTRIBUTION

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

                    SECTION 4.1  Capital Contributions.

                    (A)  Upon the contribution to the Partnership of property 
in accordance with a Contribution Agreement, Partnership Units and/or 
Preferred Units shall be issued in accordance with, and as contemplated by, 
such Contribution Agreement, and the Persons receiving such Partnership Units 
and/or Preferred Units shall become Partners and shall be deemed to have made 
a Capital Contribution as set forth on Exhibit 1. The Capital Contribution 
made by each Partner contributing assets to the Partnership under the 
Formation Agreement shall be determined by multiplying the number of 
Partnership Units issued to such Partner by $5.50 and by multiplying the 
number of Preferred Units issued to such Partner by $25.00. Exhibit I also 
sets forth the number of Partnership Units and Preferred Units owned by each 
Partner and the Percentage Interest of each Partner as of October 14,

<PAGE>

                                          14

 1997, which Percentage Interest shall be adjusted from time to time by the 
General Partner to reflect the issuance of additional Partnership Units 
and/or Preferred Units, the redemption of Partnership Units, the conversion 
of Preferred Units into Partnership Units, additional Capital Contributions 
and similar events having an effect on a Partner's Percentage Interest.  
Except as set forth in Section 4.2 (regarding issuance of additional 
Partnership Units) or Section 7.6 (regarding withholding obligations) of the 
Act, no Partner shall be required under any circumstances to contribute to 
the capital of the Partnership any amount beyond that sum required pursuant 
to this Article IV.

                    (B)  Anything in the foregoing Section 4. 1 (A) or 
elsewhere in this Agreement notwithstanding, the Partnership Units held by 
the General Partner shall, at all times, be deemed to be general partner 
interests in the Partnership and shall constitute the General Partner 
Interests.

                    SECTION 4.2  Additional Partnership Interests.

                    (A)  The Partnership may issue additional limited 
partnership interests in the form of Partnership Units or Preferred Units for 
any Partnership purpose at any time or from time to time to any Partner or 
other Person (other than the General Partner, except in accordance with 
Section 4.2(B) below).

                    (B)  The Partnership also may from time to time issue to 
the General Partner additional Partnership Interests in such classes and 
having such designations, preferences and relative rights (including 
preferences and rights senior to the existing Limited Partner Interests) as 
shall be determined by the General Partner in accordance with the Act and 
governing law.  Except as provided in Article IX, any such issuance of 
Partnership Units, Preferred Units or Partnership Interests to the General 
Partner shall be conditioned upon (i) the undertaking by the General Partner 
of a related issuance of its capital stock (with such shares having 
designations, rights and preferences such that the economic rights of the 
holders of such capital stock are substantially similar to the rights of the 
additional Partnership Interests issued to the General Partner) and the 
General Partner making a Capital Contribution (a) in an amount equal to the 
net proceeds raised in the issuance of such capital stock, in the event such 
capital stock is sold for cash or cash equivalents or (b) the property 
received in consideration for such capital stock, in the event such capital 
stock is issued in consideration for other property or (ii) the issuance by 
the General Partner of capital stock under any stock option or bonus plan and 
the General Partner making a Capital Contribution in an amount equal to the 
exercise price of the option exercised pursuant to such stock option or other 
bonus plan.

                    (C)  Except as contemplated by Article IX (regarding 
redemptions) or Section 4.2(B), the General Partner shall not issue any (i) 
additional REIT Shares, (ii) rights, options or warrants containing the right 
to subscribe for or purchase REIT Shares (other than options granted under 
the General Partner's Stock Option Plan for Non-Employee Directors, 1998 Long 
Term Incentive Plan or any stock option or similar plan for officers, 
directors and employees of the General Partner or any of its Affiliates) or 
(iii) securities convertible or exchangeable 

<PAGE>

                                          15

into REIT Shares (collectively, "Additional REIT Securities") other than to 
all holders of REIT Shares, pro rata, unless (x) the Partnership issues to 
the General Partner (i) Partnership Interests, (ii) rights, options or 
warrants containing the right to subscribe for or purchase Partnership 
Interests or (iii) securities convertible or exchangeable into Partnership 
Interests such that the General Partner receives an economic interest in the 
Partnership substantially similar to the economic interest in the General 
Partner represented by the Additional REIT Securities and (y) the General 
Partner contributes to the Partnership the net proceeds from, or the property 
received in consideration for, the issuance of the Additional REIT Securities 
and the exercise of any rights contained in any Additional REIT Securities.

                    SECTION 4.3  No Third Party Beneficiaries.  The 
provisions of this Agreement, including the foregoing provisions of this 
Article IV, are not intended to be for the benefit of any creditor of the 
Partnership or other Person to whom any debts, liabilities or obligations are 
owed by (or who otherwise has any claim against) the Partnership or any of 
the Partners and no such creditor or other Person shall obtain any right 
under any such provision against the Partnership or any of the Partners by 
reason of any debt, liability or obligation (or otherwise).

                    SECTION 4.4  Capital Accounts.

                    (A)  The Partnership shall establish and maintain a 
separate Capital Account for each Partner in accordance with Code Section 704 
and Treasury Regulations Section 1.7041(b)(2)(iv).  The Capital Account of 
each Partner shall be credited with:

                    (1)  the amount of all Capital Contributions made to the 
               Partnership by such Partner in accordance with this Agreement; 
               plus

                    (2)  all income and gain of the Partnership computed in 
               accordance with this Section 4.4 and allocated to such Partner
               pursuant to Article V (including for purposes of this Section 4.4
               (A), income and gain exempt from tax);

                    and shall be debited with the sum of:

                    (1)  all losses or deductions of the Partnership computed 
in accordance with this Section 4.4 and allocated to such Partner pursuant to 
Article V;

                    (2)  such Partner's distributive share of expenditures of 
the Partnership described in Code Section 705(a)(2)(B); and

                    (3)  all cash and the Agreed Value (reduced to take into 
account the amount of any related indebtedness assumed by the Partner, or to 
which the distributed property is subject) of any property actually 
distributed or deemed distributed by the Partnership to such Partner pursuant 
to the terms of this Agreement.

                    Any reference in any section or subsection of this 
Agreement to the Capital Account of a Partner shall be deemed to refer to 
such Capital Account as the same may be credited or debited from time to time 
as set forth above.

                    (B)  For purposes of computing the amount of any item of 
income, gain, deduction or loss to be reflected in the Partners' Capital 
Accounts, the determination, recognition and classi-

<PAGE>

                                          16

fication of each such item shall be the same as its determination, 
recognition and classification for federal income tax purposes, determined in 
accordance with Code Section 703(a), with the following adjustments:

                    (1)  any income, gain or loss attributable to the taxable 
disposition of any Partnership Asset shall be determined by treating the 
adjusted basis of such property as of the date of such disposition as equal 
to the Book Value of such property as of such date;

                    (2)  the computation of all items of income, gain, loss 
and deduction shall be made without regard to any Code Section 754 election 
that may be made by the Partnership, except to the extent required in 
accordance with the provisions of Treasury Regulations Section 
1.7041(b)(2)(iv)(m);

                    (3)  in lieu of depreciation, amortization and other cost 
recovery deductions taken into account in computing Profit and Loss, there 
shall be taken into account Depreciation for such Fiscal Year; and

                    (4)  in the event the Book Value of any Partnership Asset 
is adjusted pursuant to Section 4.4(D) below, the amount of such adjustment 
shall be treated as gain or loss from the disposition of such asset.

                    (C)  Any transferee of a Partnership Interest shall 
succeed to a pro rata portion of the transferor's Capital Account transferred 
unless such Transfer causes a Code Section 708 termination of the 
Partnership, in which case the Book Value of all Partnership Assets shall be 
adjusted immediately prior to the deemed distribution pursuant thereto as 
provided in Section 4.4(D).

                    (D)  Consistent with the provisions of Treasury 
Regulations Section 1.7041 (b)(2)(iv)(f), (i) immediately prior to the 
acquisition of an additional Partnership Interest by any new or existing 
Partner in connection with the contribution of money or other property (other 
than a de minimis amount) to the Partnership, (ii) immediately prior to the 
distribution by the Partnership to a Partner of Partnership property (other 
than a de minimis amount) as consideration for a Partnership Interest and 
(iii) immediately prior to the liquidation of the Partnership as defined in 
Treasury Regulations Section 1.704-1(b)(2)(ii)(g), the Book Value of all 
Partnership Assets shall be revalued upward or downward to reflect the fair 
market value of each such Partnership Asset as determined by the General 
Partner using such reasonable method of valuation as it may adopt unless the 
General Partner shall determine that such revaluation is not necessary to 
maintain Capital Accounts in accordance with Treasury Regulations Section 
1.704-1(b)(2)(iv).

                    (E)  The foregoing provisions of this Section 4.4 are 
intended to comply with Treasury Regulations Section 1.704-1(b) and shall be 
interpreted and applied in a manner consistent with such Treasury 
Regulations.  In the event the General Partner shall determine that it is 
prudent to modify the manner in which the Partners' Capital Accounts are 
computed hereunder in order to comply with such Treasury Regulations, the 
General Partner may make such modification if such modification is not likely 
to have a material effect on the amount or timing of any distribution to any 
Partner 

<PAGE>

                                          17

under the terms of this Agreement and the General Partner notifies the other 
Partners in writing of such modification prior to making such modification.

                    SECTION 4.5  Return of Capital Account; Interest.  Except 
as otherwise specifically provided in this Agreement, (i) no Partner shall 
have any right to withdraw or reduce its Capital Contributions or Capital 
Account, or to demand and receive property other than cash from the 
Partnership in return for its Capital Contributions or Capital Account; (ii) 
no Partner shall have any priority over any other Partners as to the return 
of its Capital Contributions or Capital Account; (iii) any return of Capital 
Contributions or Capital Accounts to the Partners shall be solely from the 
Partnership Assets, and no Partner shall be personally liable for any such 
return; and (iv) no interest shall be paid by the Partnership on Capital 
Contributions or on balances in Partners' Capital Accounts.

                    SECTION 4.6  Preemptive Rights.  No Person shall have any 
preemptive or similar rights with respect to the issuance or sale of 
additional Partnership Units or Preferred Units. 
- --------------------------------------------------------------------------------

                      ARTICLE V - ALLOCATIONS AND DISTRIBUTIONS

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

                    SECTION 5.1  Limited Liability.  For bookkeeping 
purposes, the Profits of the Partnership shall be shared, and the Losses of 
the Partnership shall be borne, by the Partners as provided in Section 5.2 
below; provided, however, that except as required by the Act or as expressly 
provided in this Agreement, neither any Limited Partner (in its capacity as a 
Limited Partner) nor any Preferred Limited Partner (in its capacity as a 
Preferred Limited Partner) shall be personally liable for losses, costs, 
expenses, liabilities or obligations of the Partnership in excess of its 
Capital Contribution required under Article IV hereof.

                    SECTION 5.2  Profits, Losses and Distributive Shares.

               (A)  Profits.  After giving effect to the special allocations,
if any, provided in Section 5.2(C) and (D), Profits in each Fiscal Year shall 
be allocated in the following order:

               (1)  First, to the General Partner until the cumulative 
Profits allocated to the General Partner under this Section 5.2(A)(1) equal 
the cumulative Losses allocated to such Partner under Section 5.2(B)(4);

               (2)  Second, to the Preferred Limited Partners in the 
proportion to the cumulative Losses allocated to such Partners under Section 
5.2(B)(3), until the cumulative Profits allocated to such Partners under this 
Section 5.2(A)(2) equal the cumulative Losses allocated to such Partners 
under Section 5.2(B)(3);

<PAGE>

                                          18

               (3)  Third, to each Partner in proportion to the cumulative 
Losses allocated to such Partner under Section 5.2(B)(2), until the 
cumulative Profits allocated to such Partner under this Section 5.2(A)(3) 
equal the cumulative Losses allocated to such Partner under Section 5.2(B)(2);

               (4)   Fourth, to each Partner in proportion to the cumulative 
Losses allocated to such Partner under Section 5.2(B)(1), until the 
cumulative Profits allocated to such Partner under this Section 5.2(A)(4) 
equal the cumulative Losses allocated to such Partner under Section 5.2(B)(1);

               (5)  Fifth, to the Preferred Limited Partners in an amount 
equal to the excess of (x) the Priority Return Amount for each Distribution 
Period or portion thereof that ends on or prior to the close of the Fiscal 
Year over (y) the cumulative Profits previously allocated under this Section 
5.2(B)(5); and

               (6)  Then, the balance, if any, to the Partners (other than 
the Preferred Limited Partners, with respect to their Preferred Units) in 
accordance with their respective Percentage Interests.

                    The allocation of Profits to any Preferred Limited 
Partner under Section 5.2(A)(5) shall be appropriately prorated in the case 
of Preferred Units that are outstanding for less than all of any Distribution 
Period.

               (B)  Losses.  After giving effect to the special allocations, 
if any, provided in Section 5.2(C) and (D), Losses in each Fiscal Year shall 
be allocated in the following order of priority:

               (1)  First, to the Partners (other than the Preferred Limited 
Partners, with respect to their Preferred Units), in accordance with their 
respective Percentage Interests, but not in excess of the positive Capital 
Account balance of any Partner prior to the allocation provided for in this 
Section 5.2(B)(1);

               (2)  Second, to the Partners (other than the Preferred Limited 
Partners, with respect to their Preferred Units) with positive Adjusted 
Capital Account balances prior to the allocation provided for in this Section 
5.2(B)(2), in proportion to the amount of such balances until all such 
balances are reduced to zero;

               (3)  Third, to the Preferred Limited Partners in proportion to 
their Adjusted Capital Account balances until their Adjusted Capital Accounts 
are reduced to zero; and

               (4)  Thereafter, to the General Partner;

provided, however, that this Section 5.2(B) shall control, notwithstanding 
any reallocation or adjustment of taxable income, loss or other items by the 
Internal Revenue Service or any other taxing authority.

               (C)  Special Allocations.  Except as otherwise provided in this
Agreement, the following special allocations will be made in the following 
order and priority:

<PAGE>

                                          19

               (1)  Partnership Minimum Gain Chargeback.  Notwithstanding any 
other provision of this Article V, if there is a net decrease in Partnership 
Minimum Gain during any tax year or other period for which allocations are 
made, each Partner will be specially allocated items of Partnership income 
and gain for that tax year or other period (and, if necessary, subsequent 
periods) in an amount equal to such Partner's share of the net decrease in 
Partnership Minimum Gain during such tax year or other period determined in 
accordance with Treasury Regulations Section 1.7042(g). Allocations pursuant 
to the preceding sentence shall be made in proportion to the respective 
amounts required to be allocated to each Partner pursuant thereto.  The items 
to be so allocated shall be determined in accordance with Treasury 
Regulations Sections 1.704-2(f)(6) and 1.704-2(j)(2).  This Section 5.2(C)(1) 
is intended to comply with the minimum gain chargeback requirements set forth 
in Treasury Regulations Section 1.704-2(f) and shall be interpreted 
consistently therewith, including the exceptions to the minimum gain 
chargeback requirement set forth in Treasury Regulations Section 1.704-2(f) 
and (3).  If the General Partner concludes, after consultation with tax 
counsel, that the Partnership meets the requirements for a waiver of the 
minimum gain chargeback requirement as set forth in Treasury Regulations 
Section 1.704-2(f)(4), the General Partner may take steps reasonably 
necessary or appropriate in order to obtain such waiver.

               (2)  Partner Nonrecourse Debt Minimum Gain Chargeback.  
Notwithstanding any other provision of this Section (other than Section 
5.2(C)(1) which shall be applied before this Section 5.2(C)(2)), if there is 
a net decrease in Partner Minimum Gain during any tax year or other period 
for which allocations are made, each Partner with a share of Partner Minimum 
Gain determined in accordance with Treasury Regulations Section 1.704-2(i)(5) 
shall be specially allocated items of Partnership income and gain for that 
period (and, if necessary, subsequent periods) in an amount equal to such 
Partner's share of the net decrease in Partner Minimum Gain determined in 
accordance with Treasury Regulations Section 1.704-2(i)(4). The items to be 
so allocated shall be determined in accordance with Treasury Regulations 
Sections 1.704-2(i)(4) and 1.704-2(j)(2)(ii). This Section 5.2(C)(2) is 
intended to comply with the minimum gain chargeback requirements of Treasury 
Regulations Section 1.704-2(i)(4) and shall be interpreted consistently 
therewith, including the exceptions set forth in Treasury Regulations Section 
1.704-2(f)(2) and (3) to the extent such exceptions apply to Treasury 
Regulations Sections 1.704-2(i)(4). If the General Partner concludes, after 
consultation with tax counsel, that the Partnership meets the requirements 
for a waiver of the Partner Minimum Gain chargeback requirement set forth in 
Treasury Regulation 1.704-2(f), but only to the extent such exception applies 
to Treasury Regulations Section 1.704-2(i)(4), the General Partner may take 
steps necessary or appropriate to obtain such waiver.

               (3)  Qualified Income Offset.  A Partner who unexpectedly 
receives any adjustment, allocation or distribution described in Treasury 
Regulations Section 1.704-1(b)(2)(ii)(d)(4), (5) or (6) will be specially 
allocated items of Partnership income and gain in an amount and manner 
sufficient to eliminate, to the extent required by Treasury Regulations 
1.704-1(b)(2)(ii)(d), the Adjusted Capital Account Deficit of the Partner as 
quickly as possible; provided that an allocation pursuant to this Section 
5.2(C)(3) shall be made if and only to the extent that such Partner would 
have an Adjusted Capital Account Deficit after all other allocations provided 
for in this Article V have been tentatively made as if this Section 5.2(C)(3) 
were not contained in this Agreement.

<PAGE>

                                          20

               (4)  Partnership Nonrecourse Deductions.  Partnership 
Nonrecourse Deductions for any taxable year or other period for which 
allocations are made will be allocated among the Partners in proportion to 
their respective Partnership Interests in the Partnership.  

               (5)  Partner Nonrecourse Deductions.  Notwithstanding anything 
to the contrary in this Agreement, any Partner Nonrecourse Deductions for any 
taxable year or other period for which allocations are made will be allocated 
to the Partner who bears the economic risk of loss with respect to the 
liability to which the Partner Nonrecourse Deductions are attributable in 
accordance with Treasury Regulations Section 1.704-2(i).

               (6)  Code Section 754 Adjustments.  To the extent an 
adjustment to the adjusted tax basis of any Partnership asset under Code 
Section 734(b) or 743(b) is required to be taken into account in determining 
Capital Accounts under Treasury Regulations Section 1.704-1(b)(2)(iv)(m)(2) 
or (4), the amount of the adjustment to the Capital Accounts will be treated 
as an item of gain (if the adjustment increases the basis of the asset) or 
loss (if the adjustment decreases the basis of the asset), and the gain or 
loss will be specially allocated to the Partners in a manner consistent with 
the manner in which their Capital Accounts are required to be adjusted under 
Treasury Regulations Section 1.704-1(b)(2)(iv)(m).

               (7)  Depreciation Recapture.  In the event there is any 
recapture of Depreciation or investment tax credit, the allocation thereof 
shall be made among the Partners in the same proportion as the deduction for 
such Depreciation or investment tax credit was allocated.

               (8)  Interest in Partnership.  Notwithstanding any other 
provision of this Agreement, no allocation of Profit or Loss (or item of 
Profit or Loss) will be made to a Partner if the allocation would not have 
"economic effect" under Treasury Regulations Section 1.704-1(b)(2)(ii)(a) or 
otherwise would not be in accordance with the Partner's interest in the 
Partnership within the meaning of Treasury Regulations Section 1.704-1(b)(3).

                    (D)  Curative Allocations.  The allocations set forth in 
Section 5.2(C)(1) through (8) (the "Regulatory Allocations") are intended to 
comply with certain requirements of Treasury Regulations Sections 1.704-1(b) 
and 1.704-2. The Regulatory Allocations may not be consistent with the manner 
in which the Partners intend to divide Partnership distributions.  
Accordingly, the General Partner is authorized to further allocate Profits, 
Losses, and other items among the Partners in a reasonable manner so as to 
prevent the Regulatory Allocations from distorting the manner in which 
Partnership distributions would be divided among the Partners under Section 
5.3, but for application of the Regulatory Allocations.  In general, the 
reallocation will be accomplished by specially allocating other Profits, 
Losses and items of income, gain, loss and deduction, to the extent they 
exist, among the Partners so that the net amount of the Regulatory 
Allocations and the special allocations to each Partner is zero.  The General 
Partner may accomplish this result in any reasonable manner that is 
consistent with Code Section 704 and the related Treasury Regulations.

                    (E)  Tax Allocations.

<PAGE>

                                          21

                    (1)  Except as otherwise provided in Section 5.2(E)(2), 
each item of income, gain, loss and deduction shall be allocated for federal 
income tax purposes in the same manner as each correlative item of income, 
gain, loss or deduction, is allocated for book purposes pursuant to the 
provisions of Section 5.2 hereof.

                    (2)  Notwithstanding anything to the contrary in this 
Article V, in an attempt to eliminate any Book-Tax Disparity with respect to 
a Contributed Property, items of income, gain, loss or deduction with respect 
to each such property shall be allocated for federal income tax purposes 
among the Partners as follows:

                         (a)  Depreciation, Amortization and Other Cost Recovery
               Items.  In the case of each Contributed Property with a Book-Tax
               Disparity, any item of depreciation, amortization or other cost 
               recovery allowance attributable to such property shall be 
               allocated as follows: (x) first, to Partners (the 
               "Non-Contributing Partners") other than the Partners who 
               contributed such property to the Partnership (or are deemed to 
               have contributed the property pursuant to Section 4.1(A) (the 
               "Contributing Partners") in an amount up to the book allocation 
               of such items made to the Non-Contributing Partners pursuant to
               Section 5.2 hereof, pro rata in proportion to the respective 
               amount of book items so allocated to the Non-Contributing 
               Partners pursuant to Section 5.2 hereof; and (y) any remaining
               depreciation, amortization or other cost recovery allowance to 
               the Contributing Partners in proportion to their Percentage
               Interests.  In no event shall the total depreciation, 
               amortization or other cost recovery allowance allocated 
               hereunder exceed the amount of the Partnership's depreciation,
               amortization or other cost recovery allowance with respect to 
               such property.

                         (b)  Gain or Loss on Disposition.  In the event the 
               Partnership sells or otherwise disposes of a Contributed 
               Property with a Book-Tax Disparity, any gain or loss recognized
               by the Partnership in connection with such sale or other
               disposition shall be allocated among the Partners as follows: (x)
               first, any gain or loss shall be allocated to the Contributing 
               Partners in proportion to their Percentage Interests to the 
               extent required to eliminate any Book-Tax Disparity with respect
               to such property; and (y) any remaining gain or loss shall be 
               allocated among the Partners in the same manner that the 
               correlative items of book gain or loss are allocated among the
               Partners pursuant to Section 5.2 hereof.

                    (3)  In the event the Book Value of a Partnership Asset 
(including a Contributed Property) is adjusted pursuant to Section 4.4(D) 
hereof, and such asset has not been deemed contributed to a new partnership, 
with the contributing partnership then being liquidated pursuant to Code 
Section 708 subsequent thereto, all items of income, gain, loss or deduction 
in respect of such property shall be allocated for federal income tax 
purposes among the Partners in the same manner as provided in Section 
5.2(E)(2) hereof to take into account any variation between the fair market 
value of the property, as determined by the General Partner using such 
reasonable method of valuation as it may adopt, and the Book Value of such 
property, both determined as of the date of such adjustment.

<PAGE>

                                          22

                    (4)  The General Partner shall have the authority to 
elect alternative methods to eliminate the Book-Tax Disparity with respect to 
one or more Contributed Properties, as permitted by Treasury Regulations 
Sections 1.704-3 and 1.704-3T, and such election shall be binding on all of 
the Partners.

                    (5)  The Partners hereby intend that the allocation of 
tax items pursuant to this Section 5.2(E) comply with the requirements of 
Code Section 704(c) and Treasury Regulations Sections 1.704-3 and 1.704-3T.

                    (6)  The allocation of items of income, gain, loss or 
deduction pursuant to this Section 5.2(E) are solely for federal, state and 
local income tax purposes, and the Capital Account balances of the Partners 
shall be adjusted solely for allocations of "book" items in respect of 
Partnership Assets pursuant to Section 5.2(A), (B), (C), (D) and (F) hereof

                    (F)  Other Allocation Rules.  The following rules will 
apply to the calculation and allocation of Profits, Losses and other items:

                    (1)  Except as otherwise provided in this Agreement, all 
Profits, Losses and other items allocated to the Partners will be allocated 
among them in proportion to their Percentage Interests.

                    (2)  For purposes of determining the Profits, Losses or 
any other item allocable to any period, Profits, Losses and other items will 
be determined on a daily, monthly or other basis, as determined by the 
General Partner using any permissible method under Code Section 706 and the 
related Treasury Regulations.

                    (3)  Except as otherwise provided in this Agreement, all 
items of Partnership income, gain, loss and deduction, and other allocations 
not provided for in this Agreement will be divided among the Partners in the 
same proportions as they share Profits and Losses; provided that any credits 
shall be allocated in accordance with Treasury Regulations Section 
1.704-1(b)(4)(ii).

                    (4)  For purposes of Treasury Regulations Section 
1.752-3(a), the Partners hereby agree that any nonrecourse liabilities of the 
Partnership in excess of the sum of (i) the Partnership Minimum Gain and (ii) 
the aggregate amount of taxable gain that would be allocated to the Partners 
under Section 704(c) (or in the same manner as Section 704(c) in connection 
with a revaluation of Partnership property) if the Partnership disposed of 
(in a taxable transaction) all Partnership property subject to one or more 
nonrecourse liabilities of the Partnership in full satisfaction of such 
liabilities and for no other consideration, shall be allocated among the 
Partners in accordance with their respective shares of Profits.  The General 
Partner shall have discretion in any Fiscal Year to allocate such excess 
nonrecourse liabilities among the Partners (a) in a manner reasonably 
consistent with allocations (that have substantial economic effect) of some 
other significant item of Partnership income or gain or (b) in accordance 
with the manner in which it is reasonably expected that the deductions 
attributable to the excess nonrecourse liabilities will be allocated.

<PAGE>

                                          23

                    (G)  Partner Acknowledgment.  The Partners agree to be 
bound by the provisions of this Section 5.2 in reporting their shares of 
Partnership income, gain, loss, deduction and credit for income tax purposes.

                    (H) Regulatory Compliance.  The foregoing provisions of 
this Section 5.2 relating to the allocation of Profits, Losses and other 
items for federal income tax purposes are intended to comply with Treasury 
Regulations Sections 1.704-1(b), 1.704-2, 1.704-3 and 1.704-3T and shall be 
interpreted and applied in a manner consistent with such Treasury Regulations.

                    SECTION 5.3  Distributions.

                    (A)  Distributable Cash for each Fiscal Year shall be 
distributed in the following order of priority:

               (1)  First, the General Partner shall cause the Partnership to 
distribute to the holder of each Preferred Unit an amount in cash equal to 
the cumulative undistributed Priority Return Amount on December 31, March 31, 
June 30 and September 30 of each year, commencing on March 31, 1998 (or in 
the case of a Preferred Unit with an issuance date after March 31, 1998, on 
the first such distribution date following the applicable issuance date); 
provided that, if any such distribution date shall be a Saturday, Sunday or 
day on which banking institutions in the State of New York are authorized or 
obligated by law to close, or a day which is declared a national or New York 
State holiday (any of the foregoing, a "Non-business Day"), then such 
distribution shall be made on the next succeeding day which is not a 
Non-business Day.  In any case in which a Preferred Unit is outstanding for 
less than all of one or more Distribution Periods, the amount distributable 
to the Preferred Limited Partner in respect of such Unit shall be 
appropriately adjusted on the basis of a 360 day year consisting of twelve 30 
day months.

               (2)  Second, there shall be distributed with respect to each 
Partnership Unit an amount equal on a per Unit basis to the amount (other 
than in REIT Shares) distributed by the General Partner on its common shares 
during the Fiscal Year (other than a liquidating distribution), except that 
the first distribution paid on Units issued on October 15, 1997 shall be pro 
rated to reflect the actual portion of the period for which the distribution 
is being paid during which such Units were outstanding.  To the extent 
practicable, distributions under this paragraph shall be made at the same 
time as the dividend distributions on the General Partner's common shares.

               (3)  Third, there shall be distributed to each holder of a 
Limited Partner Interest an amount equal to (x) the product of the taxable 
income and gain allocated to such holder for the Fiscal Year under Section 
5.2(E) and the maximum federal income tax rate plus 7% reduced by (y) the 
distributions received by such holder under Section 5.3(A)(2) during the 
Fiscal Year.  To the extent practicable, distributions under this paragraph 
shall be made in sufficient time to permit Limited Partners to pay required 
installments of estimated tax and the final tax payment for the taxable year.

               (B)  After giving effect to Section 5.3(A), the General Partner
shall have the authority to cause the Partnership to make other distributions 
from time to time as it determines, including without limitation, distributions
that are sufficient to enable the General Partner to (i) maintain its 

<PAGE>

                                          24

status as a REIT, (ii) avoid the imposition of any tax under Code Section 857 
and (iii) avoid the imposition of any excise tax under Code Section 4981.

                    (C)  Distributions pursuant to Section 5.3(B) shall be 
made pro rata among the Partners of record on the Record Date established by 
the General Partner for the distribution, in accordance with their respective 
Percentage Interests, without regard to the length of time the record holder 
has been such.  Notwithstanding the foregoing, the General Partner may pro 
rate any distributions pursuant to Section 5.3(A)(2) appropriately in the 
case of Partnership Units that are outstanding for less than all of any 
Distribution Period.

                    (D)  The General Partner shall use its reasonable efforts 
to make distributions to the Partners so as to preclude any distribution or 
portion thereof from being treated as part of a sale of property to the 
Partnership by a Partner under Section 707 of the Code or the Treasury 
Regulations thereunder; provided that the General Partner and the Partnership 
shall not have liability to a Limited Partner under any circumstances as a 
result of any distribution to a Partner being so treated.

                    SECTION 5.4  Distributions upon Liquidation.  
Notwithstanding any other provision hereof, proceeds of a Terminating Capital 
Transaction and other distributions following dissolution of the Partnership 
shall be distributed to the Partners in accordance with Section 10.2.

                    SECTION 5.5  Amounts Withheld.  All amounts withheld 
pursuant to the Code or any provision of state or local tax law and Section 
7.6 of this Agreement with respect to any allocation, payment or distribution 
to the General Partner, the Preferred Limited Partners, the Limited Partners 
or Assignees shall be treated as amounts distributed to such General Partner, 
the Preferred Limited Partners, the Limited Partners or Assignees, as 
applicable, pursuant to Section 5.3 of this Agreement.

                    SECTION 5.6  Restricted Distributions.  Notwithstanding 
any provision to the contrary contained in this Agreement, the Partnership, 
and the General Partner on behalf of the Partnership, shall not make a 
distribution to a Partner on account of its interest in the Partnership if 
such distribution would violate Section 17-607 of the Act or other applicable 
law.

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

                         ARTICLE VI - PARTNERSHIP MANAGEMENT

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

                    SECTION 6.1  Management and Control of Partnership 
Business.  

                    (A)  Except as otherwise expressly provided or limited by 
the provisions of this Agreement, the General Partner shall have full, 
exclusive and complete discretion to manage the business and affairs of the 
Partnership, to make all decisions affecting the business and affairs of the 
Partnership and to take all such action as it deems necessary or appropriate 
to accomplish the purposes of the Partnership as set forth herein.  Except as 
set forth in this Agreement, neither the Limited 

<PAGE>

                                          25

Partners nor the Preferred Limited Partners shall have any authority, right, 
or power to bind the Partnership, or to manage, or to participate in the 
management of the business and affairs of the Partnership in any manner 
whatsoever.  Such management shall in every respect be the full and complete 
responsibility of the General Partner alone as herein provided.

                    (B)  In carrying out the purposes of the Partnership, the 
General Partner shall be authorized to take all actions it deems necessary 
and appropriate to carry on the business of the Partnership.  The Limited 
Partners and the Preferred Limited Partners, by execution hereof, agree that 
the General Partner is authorized to execute, deliver and perform any 
agreement and/or transaction on behalf of the Partnership, without their 
further Consent, unless this Agreement expressly provides otherwise.

                    (C)  The General Partner and its Affiliates may acquire 
Limited Partner Interests or Preferred Units from Limited Partners or 
Preferred Limited Partners who agree so to transfer Limited Partner Interests 
or Preferred Units acquired from the Partnership in accordance with Section 
4.2(A). Any Limited Partner Interest or Preferred Limited Partner Interest 
acquired by the General Partner shall be automatically converted into a 
General Partner Interest.  Upon acquisition of any Limited Partner Interest 
or Preferred Limited Partner Interest by an Affiliate of the General Partner, 
such Affiliate shall have all the rights of a Limited Partner or Preferred 
Limited Partner, as the case may be.

                    SECTION 6.2  No Management by Limited Partners; 
Limitation of Liability.

                    (A)  Neither the Limited Partners, in their capacity as 
Limited Partners, nor the Preferred Limited Partners, in their capacity as 
Preferred Limited Partners, shall take part in the day-to-day management, 
operation or control of the business and affairs of the Partnership or have 
any right, power, or authority to act for or on behalf of or to bind the 
Partnership or transact any business in the name of the Partnership.  Neither 
the Limited Partners, in their capacity as Limited Partners, nor the 
Preferred Limited Partners, in their capacity as Preferred Limited Partners, 
shall have any rights other than those specifically provided herein or 
granted by law where consistent with a valid provision hereof.  Any approvals 
rendered or withheld by the Limited Partners or the Preferred Limited 
Partners pursuant to this Agreement shall be deemed as consultation with or 
advice to the General Partner in connection with the business of the 
Partnership and, in accordance with the Act, shall not be deemed as 
participation by the Limited Partners or the Preferred Limited Partners in 
the business of the Partnership and are not intended to create any inference 
that the Limited Partners or the Preferred Limited Partners should be 
classified as general partners under the Act.

                    (B)  Neither any Limited Partner nor any Preferred 
Limited Partner shall have any liability under this Agreement except with 
respect to withholding under Section 7104 of the Code, in connection with any 
express provision of this Agreement by such Limited Partner or Preferred 
Limited Partner or as provided in the Act.

                    (C)  The General Partner shall not take any action which 
would subject a Limited Partner (in its capacity as Limited Partner) or a 
Preferred Limited Partner (in its capacity as a Preferred Limited Partner) to 
liability as a general partner.

<PAGE>

                                          26

                    (D)  No Partner shall take any action that would result 
in the Partnership being treated as an association taxable as a corporation, 
or as a corporation, for federal income tax purposes.

                    SECTION 6.3  Limitations on Partners.

                    (A)  No Partner or Affiliate of a Partner shall have any 
authority to perform (i) any act in violation of any applicable law or 
regulation thereunder, (ii) any act prohibited by Section 6.2(C), or (iii) 
any act which is required to be Consented to or ratified pursuant to this 
Agreement without such Consent or ratification.

                    (B)  No action shall be taken by a Partner if it would 
cause the Partnership to be treated as an association taxable as a 
corporation for federal income tax purposes or, without the consent of the 
General Partner, as a publicly-traded partnership within the meaning of 
Section 7.6 of the Code.  A determination of whether such action will have 
the above described effect shall be based upon a declaratory judgment or 
similar relief obtained from a court of competent jurisdiction, a favorable 
ruling from the IRS or the receipt of a written opinion of counsel.

                    SECTION 6.4  Business with Affiliates.

                    (A)  The General Partner, in its discretion, may cause 
the Partnership to transact business with any Partner or its Affiliates for 
goods or services reasonably required in the conduct of the Partnership's 
business; provided that any such transaction shall be effected only on terms 
competitive with those that may be obtained in the marketplace from 
unaffiliated Persons.  The foregoing proviso shall not apply to transactions 
between the Partnership and its Subsidiaries.  In addition, neither the 
General Partner nor any Affiliate of the General Partner may sell, transfer 
or otherwise convey any property to, or purchase any property from, the 
Partnership, except (i) on terms competitive with those that may be obtained 
in the marketplace from unaffiliated Persons or (ii) where the General 
Partner determines, in its sole judgment, that such sale, transfer or 
conveyance confers benefits on the General Partner or the Partnership in 
respect of matters of tax or corporate or financial structure; provided, in 
the case of this clause (ii), such sale, transfer or conveyance is not being 
effected for the purpose of materially disadvantaging the Limited Partners.

                    (B)  In furtherance of Section 6.4(A), the Partnership 
may lend or contribute to its Subsidiaries on terms and conditions 
established by the General Partner.

                    SECTION 6.5  Compensation; Reimbursement of Expenses.  In 
consideration for the General Partner's services to the Partnership in its 
capacity as General Partner, the Partnership shall pay on behalf of or 
reimburse to the General Partner all expenses of the General Partner incurred 
in connection with the management of the business and affairs of the 
Partnership, including all employee compensation of employees of the General 
Partner related to services performed for the Partnership and indemnity or 
other payments made pursuant to agreements entered into in furtherance of the 
Partnership's business.  Except as otherwise set forth in this Agreement, the 
General Partner shall be fully and entirely reimbursed by the Partnership for 
any and all direct and indirect costs and expenses incurred in connection 
with the formation and continuation of the Partnership pursuant to this 

<PAGE>

                                          27

Agreement.  In addition, the General Partner shall be reimbursed by the 
Partnership for all expenses incurred by the General Partner in connection 
with issuance of additional Partnership Interests.

                    SECTION 6.6  Liability for Acts and Omissions.

                    (A)  The General Partner shall not be liable, responsible 
or accountable in damages or otherwise to the Partnership or any of the other 
Partners for any act or omission performed or omitted in good faith on behalf 
of the Partnership and in a manner reasonably believed to be (i) within the 
scope of the authority granted by this Agreement and (ii) in the best 
interests of the Partnership or the shareholders of the General Partner.  In 
exercising its authority hereunder, the General Partner may, but shall not be 
under any obligation to, take into account the tax consequences to any 
Partner of any action it undertakes on behalf of the Partnership.  Neither 
the General Partner nor the Partnership shall have any liability as a result 
of any income tax liability incurred by a Partner as a result of any action 
or inaction of the General Partner hereunder in good faith and, by their 
execution of this Agreement, the Limited Partners and the Preferred Limited 
Partners acknowledge the foregoing.

                    (B)  Unless otherwise prohibited hereunder, the General 
Partner shall be entitled to exercise any of the powers granted to it and 
perform any of the duties required of it under this Agreement directly or 
through any agent.  The General Partner shall not be responsible for any 
misconduct or negligence on the part of any agent; provided that the General 
Partner selected or appointed such agent in good faith.

                    (C)  The General Partner acknowledges that it owes 
fiduciary duties both to its shareholders and to the Limited Partners and the 
Preferred Limited Partners and it shall use its reasonable efforts to 
discharge such duties to each; provided, however, that in the event of a 
conflict between the interests of the shareholders of the General Partner and 
the interests of the Limited Partners or the Preferred Limited Partners, the 
Limited Partners and the Preferred Limited Partners agree that the General 
Partner shall discharge its fiduciary duties to the Limited Partners and the 
Preferred Limited Partners by acting in the best interests of the General 
Partner's shareholders.  Nothing contained in the preceding sentence shall be 
construed as entitling the General Partner to realize any profit or gain from 
any transaction between the General Partner and the Partnership (except in 
connection with a distribution in accordance with this Agreement), including 
from the lending of money by the General Partner to the Partnership or the 
contribution of property by the General Partner to the Partnership, it being 
understood that in any such transaction the General Partner shall be entitled 
to cost recovery only.

                    The provisions of this Agreement, to the extent that they 
restrict the duties and liabilities of the General Partner otherwise existing 
at law or in equity, are agreed by the Partners to replace such other duties 
and liabilities of the General Partner.  

                    SECTION 6.7  Indemnification.

                    (A)  The Partnership shall indemnify the General Partner 
and each director, officer and shareholder of the General Partner and each 
Person (including any Affiliate) designated as an agent by the General 
Partner in its reasonable discretion (each, an "Indemnified Party") to the 
fullest 

<PAGE>

                                          28

extent permitted under the Act (including any procedures set forth therein 
regarding advancement of expenses to such Indemnified Party) from and against 
any and all losses, claims, damages, liabilities, expenses (including 
reasonable attorneys' fees), judgments, fines, settlements and any other 
amounts arising out of or in connection with any claims, demands, actions, 
suits or proceedings (civil, criminal or administrative) relating to or 
resulting (directly or indirectly) from the operations of the Partnership, in 
which such Indemnified Party becomes involved, or reasonably believes it may 
become involved, as a result of the capacity referred to above.

                    (B)  The Partnership shall have the authority to purchase 
and maintain such insurance policies on behalf of the Indemnified Parties as 
the General Partner shall determine, which policies may cover those 
liabilities the General Partner reasonably believes may be incurred by an 
Indemnified Party in connection with the operation of the business of the 
Partnership.  The right to procure such insurance on behalf of the 
Indemnified Parties shall in no way mitigate or otherwise affect the right of 
any such Indemnified Party to indemnification pursuant to Section 6.7(A) 
hereof.

                    (C)  The provisions of this Section 6.7 are for the 
benefit of the Indemnified Parties, their heirs, executors, guardians, 
conservators, successors, assigns and administrators and shall not be deemed 
to create any rights in or benefit to any other Person.

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

               ARTICLE VII - ADMINISTRATIVE, FINANCIAL AND TAX MATTERS

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

                    SECTION 7.1  Books and Records.  The General Partner 
shall maintain at the office of the Partnership full and accurate books of 
the Partnership showing all receipts and expenditures, assets and 
liabilities, profits and losses, names and current addresses of Partners, and 
all other records necessary for recording the Partnership's business and 
affairs.  Each Limited Partner and Preferred Limited Partner shall have, upon 
written demand and at such Limited Partner's or Preferred Limited Partner's 
expense, as the case may be, the right to receive true and complete 
information regarding Partnership matters to the extent required (and subject 
to the limitations) under Delaware law.

                    SECTION 7.2  Annual Audit and Accounting.  The books and 
records of the Partnership shall be kept for financial and tax reporting 
purposes on the accrual basis of accounting in accordance with generally 
accepted accounting principles ("GAAP").  The accounts of the Partnership 
shall be audited annually by a nationally recognized accounting firm of 
independent public accountants selected by the General Partner (the 
"Independent Accountants").

                    SECTION 7.3  Partnership Funds.  The General Partner 
shall have responsibility for the safekeeping and use of all funds and assets 
of the Partnership, whether or not in its direct or indirect possession or 
control.  All funds of the Partnership not otherwise invested shall be 
deposited in one or more accounts maintained in such banking institutions as 
the General Partner shall determine, and withdrawals shall be made only in 
the regular course of Partnership business on such signatures as the General 
Partner may from time to time determine.

<PAGE>

                                          29

                    SECTION 7.4  Reports and Notices.  The General Partner 
shall provide all Partners with the following reports no later than the dates 
indicated or as soon thereafter as circumstances permit:

                    (A)  By March 31 of each year, IRS Form 1065 and Schedule 
K-1, or similar forms as may be required by the IRS, stating each Partner's 
allocable share of income, gain, loss, deduction or credit for the prior 
Fiscal Year;

                    (B)  Within ninety (90) days after the end of each of the 
first three (3) fiscal quarters, as of the last day of the fiscal quarter, a 
report containing unaudited financial statements of the Partnership, or of 
the General Partner if such statements are prepared on a consolidated basis 
with the General Partner, and such other information as may be legally 
required or determined to be appropriate by the General Partner; and

                    (C)  Within one hundred twenty (120) days after the end 
of each Fiscal Year, as of the close of the Fiscal Year, an annual report 
containing audited financial statements of the Partnership, or of the General 
Partner if such statements are prepared on a consolidated basis with the 
General Partner, presented in accordance with GAAP and certified by the 
Independent Accountants.

                    SECTION 7.5  Tax Matters.

                    (A)  The General Partner shall be the Tax Matters Partner 
of the Partnership for federal income tax matters pursuant to Code Section 
6231(a)(7)(A). The Tax Matters Partner is authorized and required to 
represent the Partnership (at the expense of the Partnership) in connection 
with all examinations of the affairs of the Partnership by any federal, 
state, or local tax authorities, including any resulting administrative and 
judicial proceedings, and to expend funds of the Partnership for professional 
services and costs associated therewith.  The Tax Matters Partner shall 
deliver to the Limited Partners and Preferred Limited Partners within ten 
(10) business days of the receipt thereof a copy of any notice or other 
communication with respect to the Partnership received from the IRS (or other 
governmental tax authority), or any court, in each case with respect to any 
administrative or judicial proceeding involving the Partnership.  The 
Partners agree to cooperate with each other in connection with the conduct of 
all proceedings pursuant to this Section 7.5(A).  

                    (B)  The Tax Matters Partner shall receive no 
compensation for its services in such capacity.  If the Tax Matters Partner 
incurs any costs related to any tax audit, declaration of any tax deficiency 
or any administrative proceeding or litigation involving any Partnership tax 
matter, such amount shall be an expense of the Partnership and the Tax 
Matters Partner shall be entitled to full reimbursement therefor.

                    (C)  The General Partner shall cause to be prepared all 
federal, state and local income tax returns required of the Partnership at 
the Partnership's expense.

                    (D)  Except as set forth herein, the General Partner 
shall determine whether to make (and, if necessary, revoke) any tax election 
available to the Partnership under the Code or any state tax law; provided, 
however, upon the request of any Partner, the General Partner shall make the 
elec-

<PAGE>

                                          30

tion under Code Section 754 and the Treasury Regulations promulgated 
thereunder.  The Partnership shall elect to deduct expenses, if any, incurred 
by it in organizing the Partnership in accordance with the provisions of Code 
Section 709.  

                    SECTION 7.6  Withholding.  Each Partner hereby authorizes 
the Partnership to withhold from or pay to any taxing authority on behalf of 
such Partner any tax that the General Partner determines the Partnership is 
required to withhold or pay with respect to any amount distributable or 
allocable to such Partner.  Any amount paid to any taxing authority which 
does not constitute a reduction in the amount otherwise distributable to such 
Partner shall be treated as a loan from the Partnership to such Partner, 
which loan shall bear interest at the "prime rate" as published from time to 
time in The Wall Street Journal plus two (2) percentage points, and shall be 
repaid within ten (10) business days after request for repayment from the 
General Partner.  The obligation to repay any such loan shall be secured by 
such Partner's Partnership Interest and each Partner hereby grants the 
Partnership a security interest in his Partnership Interest for the purposes 
set forth in this Section 7.6, this Section 7.6 being intended to serve as a 
security agreement for purposes of the Uniform Commercial Code with the 
Partnership having in respect hereof all of the remedies of a secured party 
under the Uniform Commercial Code.  Each Partner agrees to take such 
reasonable actions as the General Partner may request to perfect and continue 
the perfection of the security interest granted hereby.  In the event any 
Partner fails to repay any deemed loan pursuant to this Section 7.6 the 
Partnership shall be entitled to avail itself of any rights and remedies it 
may have. Furthermore, upon the expiration of ten (10) business days after 
demand for payment, the General Partner shall have the right, but not the 
obligation, to make the payment to the Partnership on behalf of the 
defaulting Partner and thereupon be subrogated to the rights of the 
Partnership with respect to such defaulting Partner.

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

           ARTICLE VIII -  TRANSFER OF PARTNERSHIP INTERESTS; ADMISSION OF
                                       PARTNERS
- --------------------------------------------------------------------------------

                    SECTION 8.1  Transfer by General Partner.  The General 
Partner may not voluntarily withdraw or, except as provided in Section 8.2, 
Transfer all or any portion of its General Partner Interest.  Notwithstanding 
the foregoing, the General Partner may pledge its General Partner Interest in 
furtherance of the Partnership's business (including without limitation, in 
connection with a loan agreement under which the Partnership is a borrower) 
without the consent of any Partner.

                    SECTION 8.2  Obligations of a Prior General Partner.  
Upon an Involuntary Withdrawal of the General Partner, the General Partner's 
Interest may be transferred to a successor with the Consent of the holders of 
a majority of each of the Partnership Units and the Preferred Units, voting 
separately.  The transferring General Partner shall (i) remain liable for all 
obligations and liabilities (other than Partnership liabilities payable 
solely from Partnership Assets) incurred by it as General Partner before the 
effective date of such event and (ii) pay all costs associated with the 
admission of its Successor General Partner.  However, such General Partner 
shall be free of and held 

<PAGE>

                                          31

harmless by the Partnership against any obligation or liability incurred on 
account of the activities of the Partnership from and after the effective 
date of such event, except as provided in this Agreement.

                    SECTION 8.3  Successor General Partner.  A successor to 
all of a General Partner's General Partner Interest who has been approved in 
accordance with Section 8.2 shall be admitted as the Successor General 
Partner, effective immediately prior to the Transfer.  Any such Successor 
shall carry on the business of the Partnership without dissolution.  In 
addition, the following conditions must be satisfied:

                    (A)  The Person shall have accepted and agreed to be 
bound by all the terms and provisions of this Agreement by executing a 
counterpart thereof and such other documents or instruments as may be 
required or appropriate in order to effect the admission of such Person as a 
General Partner;

                    (B)  An amendment to this Agreement evidencing the 
admission of such Person as a General Partner shall have been executed by all 
General Partners and an amendment to the Certificate shall have been filed as 
required by the Act; and

                    (C)  Any consent required under Section 11.1(A) shall 
have been obtained.

                    SECTION 8.4  Restrictions on Transfer and Withdrawal by 
Limited Partner.

                    (A)  Subject to the provisions of Section 8.4(D), no 
Limited Partner or Preferred Limited Partner may Transfer all or any portion 
of its Partnership Interest without first obtaining the Consent of the 
General Partner, which Consent may be granted or withheld in the sole and 
absolute discretion of the General Partner.  Any such purported transfer 
undertaken without such Consent shall be considered to be null and void ab 
initio and shall not be given effect.

                    (B)  No Limited Partner or Preferred Limited Partner may 
withdraw from the Partnership other than as a result of a permitted Transfer 
(i.e., a Transfer consented to as contemplated by clause (A) above or clause 
(D) below or a Transfer pursuant to clause (C) below) of all of such Limited 
Partner's or Preferred Limited Partner's Partnership Units pursuant to this 
Article VIII or pursuant to a redemption or exchange of all of such Limited 
Partner's or Preferred Limited Partner's Partnership Units pursuant to 
Article IX.  Upon the permitted Transfer or redemption of all of a Limited 
Partner's or Preferred Limited Partner's Partnership Interests, such Limited 
Partner or Preferred Limited Partner shall cease to be a Limited Partner or 
Preferred Limited Partner, as the case may be.

                    (C)  Upon the Involuntary Withdrawal of any Limited 
Partner or Preferred Limited Partner (which shall under no circumstance in 
and of itself cause the dissolution of the Partnership), the executor, 
administrator, trustee, guardian, receiver or conservator of such Limited 
Partner's or Preferred Limited Partners estate shall become a Substituted 
Limited Partner or Substituted Preferred Limited Partner upon compliance with 
the provisions of Section 8.5(A)(l)-(3).

                    (D)  Subject to clause (E) below, a Limited Partner or 
Preferred Limited Partner may Transfer, with the Consent of the General 
Partner, all or a portion of such Limited Partner's or Pre-

<PAGE>

                                          32

ferred Limited Partner's Partnership Interests to (a) a parent or parents, 
spouse, natural or adopted descendant or brother or sister, or a trust 
created by such Limited Partner or Preferred Limited Partner for the benefit 
of such Limited Partner or Preferred Limited Partner and/or any such 
person(s), of which trust such Limited Partner or Preferred Limited Partner 
or any such person(s) is a trustee, (b) a corporation controlled by a Person 
or Persons named in (a) above, (c) if the Limited Partner or Preferred 
Limited Partner is an entity, its beneficial owners, or (d) a family limited 
partnership comprised of members of the family of a Limited Partner or a 
Preferred Limited Partner, and the General Partner shall grant its Consent to 
any Transfer pursuant to this Section 8.4(D) unless such Transfer, in the 
reasonable judgment of the General Partner, would cause (or have the 
potential to cause) the General Partner to fail to qualify for taxation as a 
REIT, in which case the General Partner shall have the sole and absolute 
discretion to refuse to permit such Transfer, and any purported Transfer in 
violation of this Section 8.4(D) shall be null and void ab initio and shall 
not be given effect.

                    (E)  No Transfer of Limited Partnership Interests or 
Preferred Limited Partner Partnership Interests shall be made if such 
Transfer would (i) in the opinion of Partnership counsel, cause the 
Partnership to be terminated for federal income tax purposes or to be treated 
as an association taxable as a corporation (rather than a partnership) for 
federal income tax purposes; (ii) be effected through an "established 
securities market" or a "secondary market (or the substantial equivalent 
thereof)" within the meaning of Code Section 7704 and the Treasury 
Regulations thereunder; (iii) in the opinion of Partnership counsel, violate 
the provisions of applicable securities laws; (iv) violate the terms of (or 
result in a default or acceleration under) any law, rule, regulation, 
agreement or commitment binding on the Partnership; (v) cause the Partnership 
to become, with respect to any employee benefit plan subject to Title I of 
ERISA, a "party-in-interest" (as defined in Section 3(14) of ERISA) or a 
"disqualified person" (as defined in Section 4975(e) of the Code); (vi) in 
the opinion of counsel to the Partnership, cause any portion of the 
underlying assets of the Partnership to constitute assets of any employee 
benefit plan pursuant to Department of Labor Regulations Section 2510.3-101; 
or (vii) result in a deemed distribution to any Partner attributable to a 
failure to meet the requirements of Treasury Regulations Section 
1.752-2(d)(1), unless such Partner consents thereto.

                    (F)  Prior to the consummation of any Transfer under this 
Section 8.4, the transferor and/or the transferee shall deliver to the 
General Partner such opinions, certificates and other documents as the 
General Partner shall request in connection with such Transfer.

                    SECTION 8.5  Substituted Limited Partner.

                    (A)  No transferee shall become a Substituted Limited 
Partner or Substituted Preferred Limited Partner in place of its assignor 
unless and until the following conditions have been satisfied:

                    (1)  The assignor and transferee file a Notice or other 
evidence of Transfer and such other information reasonably required by the 
General Partner, including, without limitation, names, addresses and 
telephone numbers of the assignor and transferee;

<PAGE>

                                          33

                    (2)  The transferee executes, adopts and acknowledges 
this Agreement, or a counterpart hereto, and such other documents as may be 
reasonably requested by the General Partner, including without limitation, 
all documents necessary to comply with applicable tax and/or securities rules 
and regulations; and

                    (3)  The assignor or transferee pays all costs and fees 
incurred or charged by the Partnership to effect the Transfer and 
substitution.

                    (B)  If a transferee of a Limited Partner or Preferred 
Limited Partner does not become a Substituted Limited Partner or Substituted 
Preferred Limited Partner pursuant to Section 8.5(A), such transferee shall 
be an Assignee and shall not have any rights to require any information on 
account of the Partnership's business, to inspect the Partnership's books or 
to vote or otherwise take part in the affairs of the Partnership (such 
Partnership Interests being deemed to have been voted in the same proportion 
as all other Partnership Interests held by Limited Partners or Preferred 
Limited Partners, as the case may be, have been voted).  Such Assignee shall 
be entitled, however, to all the rights of an assignee of a limited partner 
interest under the Act.  Any Assignee wishing to Transfer the Partnership 
Units acquired shall be subject to the restrictions set forth in this Article 
VIII.

                    SECTION 8.6  Timing and Effect of Transfers.  Unless the 
General Partner agrees otherwise, Transfers under this Article VIII may only 
be made as of the first day of a fiscal quarter of the Partnership.  Upon any 
Transfer of a Partnership Interest in accordance with this Article VIII or 
redemption of a Partnership Interest in accordance with Article IX, the 
Partnership shall allocate all items of Profit and Loss between the assignor 
and the transferee in accordance with Section 5.2(F)(2) hereof.  The assignor 
shall have the right to receive all distributions as to which the Record Date 
precedes the date of Transfer and the transferee shall have the right to 
receive all distributions thereafter.

                    SECTION 8.7  Additional Limited Partners.  Other than in 
accordance with the transactions specified in the Contribution Agreements, 
after the initial execution of this Agreement and the admission to the 
Partnership of the Initial Limited Partners, any Person making a Capital 
Contribution to the Partnership in accordance herewith shall be admitted as 
an Additional Limited Partner or Additional Preferred Limited Partner only 
(i) with the Consent of the General Partner and (ii) upon execution, adoption 
and acknowledgment of this Agreement, or a counterpart hereto, and such other 
documents as may be reasonably requested by the General Partner, including 
without limitation, the power of attorney required under Section 12.3. Upon 
satisfaction of the foregoing requirements, such Person shall be admitted as 
an Additional Limited Partner or Additional Preferred Limited Partner 
effective on the date upon which the name of such Person is recorded on the 
books of the Partnership.

                    SECTION 8.8  Amendment of Agreement and Certificate.  
Upon any admission of a Person as a Partner to the Partnership, the General 
Partner shall make any necessary amendment to this Agreement to reflect such 
admission and, if required by the Act, to cause to be filed an amendment to 
the Certificate.

<PAGE>

                                          34

                    SECTION 8.9  Pledges.  No Limited Partner or Preferred 
Limited Partner may pledge, mortgage, hypothecate or encumber any Limited 
Partnership Interest or Preferred Limited Partner Partnership Interest, 
without first obtaining the Consent of the General Partner, which Consent may 
be granted or withheld in the sole and absolute discretion of the General 
Partner.  Any such purported pledge, mortgage, hypothecation or encumbrance 
undertaken without such Consent shall be considered null and void ab initio 
and shall not be given effect.  

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                         ARTICLE IX REDEMPTION AND CONVERSION

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

                    SECTION 9.1  Right of Redemption

                    (A)  Subject to compliance with (v) the Act, (w) the 
terms and conditions of the REIT Charter,(x) all requirements under the Code 
applicable to real estate investment trusts, (y) Title 8 of the Corporations 
and Associations Article of the Annotated Code of Maryland, as amended, or 
any other law as in effect from time to time and (z) any applicable rule or 
policy of any stock exchange or self-regulatory organization (a "Redemption 
Restriction"), beginning on September 1, 1998, during each Redemption Period 
each Redeeming Party shall have the right to require the Partnership to 
redeem all or a portion of the Partnership Units held by such Redeeming Party 
by providing the General Partner with a Redemption Notice.  A Limited Partner 
may invoke its rights under this Article IX with respect to one or more 
Partnership Units or all of the Partnership Units held by such Limited 
Partner.  Upon the General Partner's receipt of a Redemption Notice from a 
Redeeming Party, the Partnership shall be obligated (subject to the existence 
of any Redemption Restriction) to redeem the Partnership Units from such 
Redeeming Party (the "Redemption Obligation").

                    (B)  Upon receipt of a Redemption Notice from a Redeeming 
Party, the General Partner shall either (i) cause the Partnership to redeem 
the Partnership Units tendered in the Redemption Notice, (ii) assume the 
Redemption Obligation, as set forth in Section 9.4, or (iii) provide written 
Notice to the Redeeming Party of each applicable Redemption Restriction.

                    SECTION 9.2  Timing of Redemption.  The Redemption 
Obligation (or the obligation to provide Notice of an applicable Redemption 
Restriction, if one exists) shall mature on the date which is seven (7) 
business days after the receipt by the General Partner of a Redemption Notice 
from the Redeeming Party (the "Redemption Date").

                    SECTION 9.3  Redemption Price.  On or before the 
Redemption Date, the Partnership (or the General Partner if it elects 
pursuant to Section 9.4) shall deliver to the Redeeming Party, in the sole 
and absolute discretion of the General Partner, either (i) a Share Payment or 
(ii) a Cash Payment; provided, however, that a Share Payment shall not be 
made, and a Cash Payment shall instead be made in all cases, if, in the sole 
and absolute discretion of the General Partner, the making of a Share Payment 
would result in a material risk of termination of the General Partner's 
status as a 

<PAGE>

                                          35

REIT under the Code.  In order to enable the Partnership to effect a 
redemption by making a Share Payment pursuant to this Section 9.3, the 
General Partner in its sole and absolute discretion may issue to the 
Partnership the number of REIT Shares required to make such Share Payment in 
exchange for the issuance to the General Partner of Partnership Units equal 
in number to the quotient of the number of REIT Shares issued and the 
Conversion Factor.  Any such Partnership Unit redeemed by the Partnership 
shall be deemed cancelled.

                    SECTION 9.4  Assumption of Redemption Obligation.  Upon 
receipt of a Redemption Notice, the General Partner, in its sole and absolute 
discretion, shall have the right to assume the Redemption Obligation of the 
Partnership.  In such case, the General Partner shall be substituted for the 
Partnership for all purposes of this Article IX and, upon acquisition of the 
Partnership Units tendered by the Redeeming Party pursuant to the Redemption 
Notice shall be treated for all purposes of this Agreement as the owner of 
such Partnership Units.  Such Partnership Units shall constitute General 
Partner Interests.  Such exchange transaction shall be treated for federal 
income tax purposes by the Partnership, the General Partner and the Redeeming 
Party as a sale by the Redeeming Party as seller to the General Partner as 
purchaser.

                    SECTION 9.5  Further Assurances; Certain Representations. 
 Each party to this Agreement agrees to execute any documents deemed 
reasonably necessary by the General Partner to evidence the issuance of any 
Share Payment to a Redeeming Party. Each Limited Partner and Preferred 
Limited Partner, by executing this Agreement, shall be deemed to have 
represented to the General Partner and the Partnership that (i) its 
acquisition of its Partnership Interest is or will be made as a principal for 
its own account, for investment purposes only and not with a view to the 
resale or distribution of such Partnership Interest and (ii) if it shall 
receive REIT Shares pursuant to this Article IX other than pursuant to an 
effective registration statement under the Securities Act of 1933, as 
amended, that its acquisition of such REIT Shares is or will be made as a 
principal for its own account, for investment purposes only and not with a 
view to the resale or distribution of such REIT Shares and agrees that such 
REIT Shares may be bear a legend to the effect that such REIT Shares have not 
been so registered and may not be sold other than pursuant to such a 
registration statement or an exemption from the registration requirements of 
such Act.

                    SECTION 9.6  Effect of Redemption.  Upon the satisfaction 
of the Redemption Obligation by the Partnership or the General Partner, as 
the case may be, the Redeeming Party shall have no further right to receive 
any Partnership distributions in respect of the Partnership Units so redeemed 
and shall be deemed to have represented to the Partnership and the General 
Partner that the Partnership Units tendered for redemption are not subject to 
any liens, claims or encumbrances.

                    SECTION 9.7  Registration Rights.  In the event a Limited 
Partner receives REIT Shares in connection with a redemption of Partnership 
Units pursuant to this Article IX, such Limited Partner shall be entitled to 
have such REIT Shares registered under the Securities Act of 1933, as 
amended, as provided in the Registration Rights Agreement.

                    SECTION 9.8  Conversion.  (A) Each Preferred Limited 
Partner shall have the right, at any time or from time to time, to convert on 
or after October 1, 1999 some or all of its Preferred 

<PAGE>

                                          36

Units into Limited Partner Interests, effective upon January 1, April 1, July 
1 or October 1 of any year, by providing the General Partner with a 
Conversion Notice not less than 30 days prior to the effective date of such 
conversion.  Upon the effective date of any such conversion, the Preferred 
Units which are the subject of such conversion shall be converted, without 
necessity of any further action by the General Partner, into Partnership 
Units of Limited Partner Interest on the basis of 3.5714 Partnership Units of 
Limited Partner Interest for each Preferred Unit being converted plus an 
amount in cash equal to the accrued Priority Return Amount in respect of such 
Preferred Units.  In any case in which the conversion into Limited Partner 
Interests under this Section would result in the issuance of a fractional 
Limited Partner Interest, the General Partner shall pay the converting 
Limited Partner cash in lieu of issuance of a fractional Limited Partner 
Interest, with the value of such fractional interest being determined by 
reference to the Unit Value applicable on the date of conversion.

                    (B)  In any case in which there is an unpaid Priority 
Return Amount with respect to a Preferred Unit that is converted pursuant to 
paragraph (A) of this Section, the converting Partner shall continue to have 
the right to distributions (and allocations) under Article V and Section 10.2 
of this Agreement as if the converting Partner continued to hold the 
converted Preferred Unit until the unpaid distributions (and related 
allocations) have been paid (or allocated).

                    SECTION 9.9  Redemption Restriction.

                    (A)  The General Partner shall not take, or cause to be 
taken, any action which would cause a Redemption Restriction to exist or 
continue.

                    (B)  The General Partner shall, at its cost and expense, 
take, or cause to be taken, all such actions that may be necessary or 
desirable to mitigate the existence or effect of any Redemption Restriction 
and to facilitate and make effective the rights of redemption and conversion 
provided in this Article IX.

                    SECTION 9.10  Special Event.

                    (A) Notwithstanding any provision of this Agreement to 
the contrary, upon the occurrence of a Special Event (whether before or after 
September 1, 1998), each Redeeming Party shall immediately have the 
unconditional right (irrespective of whether a Redemption Restriction exists 
or could thereby be created other than a Redemption Restriction under the 
Act) to require the Partnership to redeem all or a portion of the Partnership 
Units held by such Redeeming Party by providing the General Partner with a 
Redemption Notice.  A Limited Partner may invoke its rights under this 
Section 9.10 with respect to one or more Partnership Units or all of the 
Partnership Units held by such Limited Partner.  Any such redemption shall 
otherwise be governed by and effected and implemented pursuant to this 
Article IX as if no Redemption Restriction existed.

                    (B)  Notwithstanding any provision of this Agreement to 
the contrary, upon the occurrence of a Special Event (whether before or after 
October 1, 1999), each Preferred Limited Partner shall have the right 
effective upon the happening of such Special Event, at any time or from time 
to time, to convert some or all of its Preferred Units into Limited Partner 
Interests by providing the Gen-

<PAGE>

                                          37

eral Partner with a Conversion Notice.  Any such conversion shall otherwise 
be governed by and effected and implemented pursuant to this Article IX.

                    (C)  "Special Event" means the occurrence of any of the 
following:

                         (I)  any person or group (as such terms are used in 
Section 13(d) and 14(d) of the Securities Exchange Act of 1934, as amended 
("Exchange Act")) other than the Permitted Holders, directly or indirectly, 
makes an offer to purchase or commences a tender offer for REIT Shares such 
that, after acquiring all such REIT Shares offered to be acquired or tendered 
for, such person or group would then be the "beneficial owner" (as defined in 
Rules 13d-3 and 13d-5 under the Exchange Act), directly or indirectly, of 20% 
or more of the total number of REIT Shares then issued and outstanding; or

                         (II) any "person" (as such term is used in Sections 
13(d) and 14(d) of the Exchange Act), other than one or more Permitted 
Holders, is or becomes the beneficial owner (as defined in clause (C)(1) 
above, except that for purposes of this clause (II) such person shall be 
deemed to have "beneficial ownership" of all shares that any such person has 
the right to acquire, whether such right is exercisable immediately or only 
after the passage of time), directly or indirectly, of more than 20% of the 
total voting power represented by all the REIT Shares then outstanding; or

                         (III)     during any period of two consecutive 
years, individuals who at the beginning of such period constituted the Board 
of Trustees of COPT (together with any new directors whose election by such 
Board of Trustees or whose nomination for election by the shareholders of 
COPT was approved by a vote of 66 2/3% of the directors of COPT then still in 
office who were either trustees at the beginning of such period or whose 
election or nomination for election was previously so approved) cease for any 
reason to constitute a majority of the Board of Trustees of COPT then in 
office; or

                         (IV) the merger or consolidation of COPT with or 
into another Person or the merger or consolidation of another Person with or 
into COPT, or the sale of all or substantially all the assets of COPT to 
another Person (other than a Person that is controlled by the Permitted 
Holders in the aggregate), and, in the case of any such merger or 
consolidation, the securities of COPT that are outstanding immediately prior 
to such transaction and which represent 100% of the aggregate voting power of 
the REIT Shares are changed into or exchanged for cash, securities or 
property.

                    (D)  "Permitted Holders" means Jay H. Shidler, Clay W. 
Hamlin III, Westbrook Real Estate Fund I, L.P. and Westbrook Real Estate Co. 
Investment Partnership I, L.P. and any corporation, partnership, trust, 
estate or other legal entity controlled by any of the foregoing Persons (or 
jointly controlled by Messrs. Shidler and Hamlin).

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

                       ARTICLE X - DISSOLUTION AND LIQUIDATION

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

<PAGE>

                                          38

                    SECTION 10.1  Term and Dissolution.  The Partnership 
commenced as of October 10, 1997, and shall continue until October 31, 2096, 
at which time the Partnership shall dissolve or until dissolution occurs 
prior to that date at any time there are no limited partners of the 
Partnership and for any one of the following reasons:

                    (A)  An Involuntary Withdrawal or a voluntary withdrawal, 
even though in violation of this Agreement, of the General Partner or any 
other event that causes the General Partner to cease to be a general partner 
under the Act (other than a Transfer to a Successor General Partner in 
accordance with Article VIII) unless, within ninety (90) days after such 
event a majority of the Limited Partners remaining agree in writing to the 
continuation of the Partnership and to the appointment, effective as of the 
date of such event, of a Successor General Partner;

                    (B)  Entry of a decree of judicial dissolution of the 
Partnership under the Act;

                    (C)  The sale, exchange or other disposition of all or 
substantially all of the Partner-ship Assets; or

                    (D)  The affirmative vote of the holders of not less than 
two-thirds of the Limited Partner Interests.

                    For purposes of Sections 10.1 and 10.2, Preferred Units 
shall be treated as if they have been converted on the date of any such vote 
into Limited Partner Interests pursuant to Section 9.8 and the Preferred 
Limited Partners holding such Preferred Units shall be treated as Limited 
Partners.

                    SECTION 10.2  Liquidation of Partnership Assets.

                    (A)  Subject to Section 10.2(E), in the event of 
dissolution pursuant to Section 10.1, the Partnership shall continue solely 
for purposes of winding up the affairs of, achieving a final termination of, 
and satisfaction of the creditors of, the Partnership.  The General Partner 
(or, if there is no General Partner remaining, any Person elected by a 
majority in interest of the Limited Partners (the "Liquidator")) shall be 
responsible for oversight of the winding up and termination of the 
Partnership.  The Liquidator shall obtain a full accounting of the assets and 
liabilities of the Partnership and such Partnership Assets shall be 
liquidated (including, at the discretion of the Liquidator, in exchange, in 
whole or in part, for REIT Shares) as promptly as the Liquidator is able to 
do so without any undue loss in value, with the proceeds therefrom applied 
and distributed in the following order:

                    (1)  First, to creditors, including partners who are 
creditors, in satisfaction of liabilities of the Partnership (whether by 
payment or the making of reasonable provision for payment thereof), other 
than liabilities for distributions to Partners and former Partners;

                    (2)  Second, to the Preferred Limited Partners in amounts 
equal to any unpaid Priority Return Amounts;

<PAGE>

                                          39

                    (3)  Third, to Partners and former Partners in 
satisfaction of liabilities for distributions; and

                    (4)  The balance, if any, to the Partners in accordance 
with their positive Capital Accounts after giving effect to all 
contributions, distributions, and allocations for all periods.

                    (B)  In accordance with Section 10.2(A), the Liquidator 
shall proceed without any unnecessary delay to sell and otherwise liquidate 
the Partnership Assets; provided, however, that if the Liquidator shall 
determine that an immediate sale of part or all of the Partnership Assets 
would cause undue loss to the Partners, the Liquidator may defer the 
liquidation except (i) to the extent provided by the Act or (ii) as may be 
necessary to satisfy the debts and liabilities of the Partnership to Persons 
other than the Partners.

                    (C)  If, in the sole and absolute discretion of the 
Liquidator, there are Partnership Assets that the Liquidator will not be able 
to liquidate, or if the liquidation of such assets would result in undue loss 
to the Partners, the Liquidator may distribute such Partnership Assets to the 
Partners in-kind, in lieu of cash, as tenants-in-common in accordance with 
the priorities set forth in Section 10.2(A). The foregoing notwithstanding, 
such in-kind distributions shall only be made if in the Liquidator's good 
faith judgment that is in the best interest of the Partners.

                    (D)  Upon the complete liquidation and distribution of 
the Partnership Assets, the Partners shall cease to be partners of the 
Partnership, and the Liquidator shall execute, acknowledge and cause to be 
filed all certificates and notices required by law to terminate the 
Partnership.  Upon the dissolution of the Partnership pursuant to Section 
10.1, the Liquidator shall cause to be prepared, and shall furnish to each 
Partner, a statement setting forth the assets and liabilities of the 
Partnership.  Promptly following the complete liquidation and distribution of 
the Partnership Assets, the Liquidator shall furnish to each Partner a 
statement showing the manner in which the Partnership Assets were liquidated 
and distributed.

                    (E)  Notwithstanding the foregoing provisions of this 
Section 10.2, in the event that the Partnership shall dissolve as a result of 
the expiration of the term provided for herein or as a result of the 
occurrence of an event of the type described in Section 10.1(B) or (C), then 
each Limited Partner shall be deemed to have delivered a Redemption Notice on 
the date of such dissolution.  In connection with each such Redemption 
Notice, the General Partner shall have the option, subject to the Act, of 
either (i) complying with the redemption procedures contained in Article IX 
or (ii) at the request of any Limited Partner, delivering to such Limited 
Partner, Partnership property approximately equal in value (after taking into 
account the liabilities hereto referred to) the amount otherwise 
distributable to such Partner under Section 10.2(A)(4) hereof upon the 
assumption by such Limited Partner of such Limited Partner's proportionate 
share of the Partnership's liabilities and payment by such Limited Partner 
(or the Partnership) of any excess (or deficiency) of the value of the 
property so delivered over the amount otherwise distributable to such Partner 
under Section 10.2(A)(4). In lieu of requiring such Limited Partner to assume 
its proportionate share of Partnership liabilities, the General Partner may, 
subject to the Act, deliver to such Limited Partner unencumbered Partnership 
property approximately equal in value to the amount otherwise distributable 
to such Partner under Section 

<PAGE>

                                          40

10.2(A)(4).  In furtherance of the foregoing, a Partner may be compelled to 
accept a distribution of any asset in kind from the Partnership despite the 
fact that the percentage of the assets distributed to him exceeds the 
percentage of that asset which is equal to the percentage in which he shares 
in distributions from the Partnership.

                    SECTION 10.3  Effect of Treasury Regulations.

                    (A)  In the event the Partnership is "liquidated" within 
the meaning of Treasury Regulations Section 1.704-1(b)(2)(ii)(g) and there 
has been a dissolution of the Partnership under Section 10.1 hereof, 
distributions shall be made pursuant to this Article X to the General 
Partner, the Limited Partners, the Preferred Limited Partners who have 
positive Capital Accounts in compliance with Treasury Regulations Section 
1.704-1(b)(2)(ii)(b)(2).  If any Partner has a deficit balance in its Capital 
Account (after giving effect to all contributions (without regard to this 
Section 10.3(A)), distributions and allocations), such Partner shall have no 
obligation to make any contribution to the capital of the Partnership.  Any 
deficit restoration obligation pursuant to the provisions hereof shall be for 
the benefit of creditors of the Partnership or any other Person to whom any 
debts, liabilities, or obligations are owed by (or who otherwise has any 
claim against) the Partnership or the General Partner, in its capacity as 
general partner of the Partnership.

                    (B)  In the event the Partnership is "liquidated" within 
the meaning of Treasury Regulations Section 1.704-1(b)(2)(ii)(g) but there 
has been no dissolution of the Partnership under Section 10.1 hereof, then 
the Partnership Assets shall not be liquidated, the Partnership's liabilities 
shall not be paid or discharged and the Partnership's affairs shall not be 
wound up.  In the event of such a liquidation there shall be deemed to have 
been a distribution of Partnership Assets in kind to the Partners in 
accordance with their respective Capital Accounts followed by a 
recontribution of the Partnership Assets by the Partners also in accordance 
with their respective Capital Accounts.

                    SECTION 10.4   Time for Winding-Up.  Anything in this 
Article X notwithstanding, a reasonable time shall be allowed for the orderly 
winding-up of the business and affairs of the Partnership and the liquidation 
of the Partnership Assets in order to minimize any potential for losses as a 
result of such process.  During the period of winding-up, this Agreement 
shall remain in full force and effect and shall govern the rights and 
relationships of the Partners inter se.

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

                         ARTICLE XI - AMENDMENTS AND MEETINGS

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

                    SECTION 11.1  Amendment Procedure.

                    (A)  Amendments to this Agreement may be proposed by the 
General Partner. An amendment proposed at any time when the General Partner 
holds less than 90% of all Partnership Units will be adopted and effective 
only if it receives the Consent of the holders of a majority of each of the 
Partnership Units and Preferred Units, voting separately, not then held by 
the General Partner 

<PAGE>

                                          41

and an amendment proposed at any time when the General Partner holds 90% or 
more of all Partnership Units and Preferred Units may be made by the General 
Partner without the Consent of any Limited Partner or Preferred Limited 
Partner; provided, however, no amendment shall be adopted if it would (i) 
convert a Limited Partner's Partnership Interest or Preferred Limited 
Partner's Preferred Units into a general partner interest, (ii) increase the 
liability of a Limited Partner or a Preferred Limited Partner under this 
Agreement, (iii) except as otherwise permitted in this Agreement, alter the 
amount or the Partner's rights to distributions set forth in Article V or X, 
or the allocations set forth in Article IV, (iv) alter or modify any aspect 
of the Partners' rights with respect to redemption of Partnership Units or 
conversion of Preferred Units, (v) cause the early termination of the 
Partnership (other than pursuant to the terms hereof) or (vi) amend this 
Section 11.1(A), in each case without the Consent of each Partner adversely 
affected thereby.  In connection with any proposed amendment of this 
Agreement requiring Consent, the General Partner shall either call a meeting 
to solicit the vote of the Partners or seek the written vote of the Partners 
to such amendment.  In the case of a request for a written vote, the General 
Partner shall be authorized to impose such reasonable time limitations for 
response, but in no event less than ten (10) days, with the failure to 
respond being deemed a vote consistent with the vote of the General Partner.

                    (B)  Notwithstanding the foregoing, amendments may be 
made to this Agreement by the General Partner, without the Consent of any 
Limited Partner or Preferred Limited Partner, to (i) add to the 
representations, duties or obligations of the General Partner or surrender 
any right or power granted to the General Partner herein; (ii) cure any 
ambiguity, correct or supplement any provision herein which may be 
inconsistent with any other provision herein or make any other provisions 
with respect to matters or questions arising hereunder which will not be 
inconsistent with any other provision hereof; (iii) reflect the admission, 
substitution, termination or withdrawal of Partners in accordance with this 
Agreement; or (iv) satisfy any requirements, conditions or guidelines 
contained in any order, directive, opinion, ruling or regulation of a federal 
or state agency or contained in federal or state law.  The General Partner 
shall reasonably promptly notify the Limited Partners and Preferred Limited 
Partners whenever it exercises its authority pursuant to this Section 11.1(B).

                    (C)  Within ten (10) days of the making of any proposal 
to amend this Agreement, the General Partner shall give all Partners Notice 
of such proposal (along with the text of the proposed amendment and a 
statement of its purposes).

                    SECTION 11.2  Meetings and Voting.

                    (A) Meetings of Partners may be called by the General 
Partner.  The General Partner shall give all Partners Notice of the purpose 
of such proposed meeting not less than seven (7) days nor more than thirty 
(30) days prior to the date of the meeting.  Meetings shall be held at a 
reasonable time and place selected by the General Partner.  Whenever the vote 
or Consent of Partners is permitted or required hereunder, such vote or 
Consent shall be requested by the General Partner and may be given by the 
Partners in the same manner as set forth for a vote with respect to an 
amendment to this Agreement in Section 11.1(A).

<PAGE>

                                          42

                    (B)  Any action required or permitted to be taken at a 
meeting of the Partners may be taken without a meeting if a written consent 
setting forth the action to be taken is signed by the Partners owning 
Percentage Interests required to vote in favor of such action, which consent 
may be evidenced in one or more instruments (for this purpose Preferred Units 
and Preferred Limited Partners shall be treated as provided in Section 
10.1(D) in the case of a vote pursuant to such Section). Consents need not be 
solicited from any other Partner if the written consent of a sufficient 
number of Partners has been obtained to take the action for which such 
solicitation was required.

                    (C)  Each Limited Partner and each Preferred Limited 
Partner may authorize any Person or Persons, including without limitation the 
General Partner, to act for him by proxy on all matters on which a Limited 
Partner or a Preferred Limited Partner may participate.  Every proxy (i) must 
be signed by the Limited Partner, the Preferred Limited Partner or their 
attorney-in-fact, (ii) shall expire eleven (11) months from the date thereof 
unless the proxy provides otherwise and (iii) shall be revocable at the 
discretion of the Limited Partner or Preferred Limited Partner granting such 
proxy.

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

                        ARTICLE XII - MISCELLANEOUS PROVISIONS

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                    SECTION 12.1  Title to Property.  All property owned by 
the Partnership, whether real or personal, tangible or intangible, shall be 
deemed to be owned by the Partnership as an entity, and no Partner, 
individually, shall have any ownership of such property.  The Partnership may 
hold any of its assets in its own name or, in the name of its nominee, which 
nominee may be one or more individuals, corporations, partnerships, limited 
liability companies, trusts or other entities.

                    SECTION 12.2  Other Activities of Limited Partners and 
Preferred Limited Partners.  Except as expressly provided otherwise in this 
Agreement or in any other agreement entered into by a Limited Partner or a 
Preferred Limited Partner or any Affiliate of a Limited Partner or a 
Preferred Limited Partner and the Partnership, the General Partner or any 
Subsidiary of the Partnership or the General Partner, any Limited Partner or 
Preferred Limited Partner or any Affiliate of any Limited Partner or 
Preferred Limited Partner may engage in, or possess an interest in, other 
business ventures of every nature and description, independently or with 
others, including, without limitation, real estate business ventures, whether 
or not such other enterprises shall be in competition with any activities of 
the Partnership, the General Partner or any Subsidiary of the Partnership or 
the General Partner; and neither the Partnership, the General Partner, any 
such Subsidiary nor the other Partners shall have any right by virtue of this 
Agreement in and to such independent ventures or to the income or profits 
derived therefrom.

                    SECTION 12.3  Power of Attorney.

                    (A)  Each Partner hereby irrevocably appoints and 
empowers the General Partner (which term shall include the Liquidator, in the 
event of a liquidation, for purposes of this Section 12.3) and each of their 
authorized officers and attorneys-in-fact with full power of substitution as 
his 

<PAGE>

                                          43

true and lawful agent and attorney-in-fact, with full power and authority in 
his name, place and stead to:

                    (1)  make, execute, acknowledge, publish and file in the 
appropriate public offices (a) any duly approved amendments to the 
Certificate pursuant to the Act and to the laws of any state in which such 
documents are required to be filed; (b) any certificates, instruments or 
documents as may be required by, or may be appropriate under, the laws of any 
state or other jurisdiction in which the Partnership is doing or intends to 
do business; (c) any other instrument which may be required to be filed by 
the Partnership under the laws of any state or by any governmental agency, or 
which the General Partner deems advisable to file; (d) any documents which 
may be required to effect the continuation of the Partnership, the admission, 
withdrawal or substitution of any Partner pursuant to Article VIII, 
dissolution and termination of the Partnership pursuant to Article X, or the 
surrender of any rights or the assumption of any additional responsibilities 
by the General Partner; (e) any document which may be required to effect an 
amendment to this Agreement, to the extent such amendment is permitted by 
Section 11.1; and (f) all instruments (including this Agreement and 
amendments and restatements hereof) relating to the determination of the 
rights, preferences and privileges of any class or series of Partnership 
Interests issued pursuant to Section 4.2(B) of this Agreement; and

                    (2)  sign, execute, swear to and acknowledge all voting 
ballots, consents, approvals, waivers, certificates and other instruments 
appropriate or necessary, in the sole discretion of the General Partner, to 
make, evidence, give, confirm or ratify any vote, consent, approval, 
agreement or other action which is made or given by the Partners hereunder or 
is consistent with the terms of this Agreement and appropriate or necessary, 
in the sole discretion of the General Partner, to effectuate the terms or 
intent of this Agreement.

                    (B)  Nothing herein contained shall be construed as 
authorizing the General Partner to amend this Agreement except in accordance 
with Article XI or as may be otherwise expressly provided for in this 
Agreement.

                    (C)  The foregoing grant of authority (i) is a special 
power of attorney, coupled with an interest, and it shall survive the 
disability or Involuntary Withdrawal of any Partner and shall extend to such 
Partner's heirs, executors, guardians, conservators, successors, assigns and 
personal representatives; (ii) may be exercised by the General Partner for 
each and every Partner acting as attorney-in-fact for each and every Partner; 
and (iii) shall survive the Transfer by a Limited Partner or Preferred 
Limited Partner of all or any portion of its Partnership Interest and shall 
be fully binding upon such transferee; except that the power of attorney 
shall survive such assignment with respect to the assignor Limited Partner or 
Preferred Limited Partner for the sole purpose of enabling the General 
Partner to execute, acknowledge and file any instrument necessary to effect 
the admission of the transferee as a Substituted Limited Partner or 
Substituted Preferred Limited Partner.  Each Partner hereby agrees to be 
bound by any representations made by the General Partner, acting in good 
faith pursuant to such power of attorney. Each Partner shall execute and 
deliver to the General Partner, within fifteen (15) days after receipt of the 
General Partner's request therefor, such further designa-

<PAGE>

                                          44

tions, powers of attorney and other instruments as the General Partner deems 
necessary to effectuate this Agreement and the purposes of the Partnership.

                    SECTION 12.4  Notices.  All notices and other 
communications provided for or permitted hereunder shall be made in writing 
by hand delivery, registered first-class mail, telex, telecopier, or any 
courier guaranteeing overnight delivery, (i) if to a Limited Partner or a 
Preferred Limited Partner, at the most current address given by such Limited 
Partner or Preferred Limited Partner to the General Partner by means of a 
notice given in accordance with the provisions of this Section 12.4, which 
address initially is the address contained in the records of the General 
Partner or the Partnership, or (ii) if to the General Partner or the 
Partnership, Corporate Office Properties Trust, One Logan Square, Suite 1105, 
Philadelphia, PA 19103, Attn:  President.

                    All such notices and communications shall be deemed to 
have been duly given: at the time delivered by hand, if hand delivered; five 
business days after being deposited in the mail, postage prepaid, if mailed; 
when answered back, if telexed; or when receipt is acknowledged, if 
telecopied.

                    SECTION 12.5  Further Assurances.  The parties agree to 
execute and deliver all such documents, provide all such information and take 
or refrain from taking any action as may be necessary or desirable to achieve 
the purposes of this Agreement and the Partnership.

                    SECTION 12.6  Titles and Captions.  All article or 
section titles or captions in this Agreement are solely for convenience and 
shall not be deemed to be part of this Agreement or otherwise define, limit 
or extend the scope or intent of any provision hereof.

                    SECTION 12.7  Applicable Law.  This Agreement, and the 
application or interpretation thereof, shall be governed exclusively by its 
terms and by the law of the State of Delaware, without regard to its 
principles of conflicts of laws.

                    SECTION 12.8  Binding Agreement.  This Agreement shall be 
binding upon the parties hereto, their heirs, executors, personal 
representatives, successors and assigns.

                    SECTION 12.9  Waiver of Partition.  Each of the parties 
hereto irrevocably waives during the term of the Partnership any right that 
it may have to maintain any action for partition with respect to any property 
of the Partnership.

                    SECTION 12.10  Counterparts and Effectiveness.  This 
Agreement may be executed in several counterparts, which shall be treated as 
originals for all purposes, and all so executed shall constitute one 
agreement, binding on all of the parties hereto, notwithstanding that all the 
parties are not signatory to the original or the same counterpart.  Any such 
counterpart shall be admissible into evidence as an original hereof against 
each Person who executed it.  The execution of this Agreement and delivery 
thereof by facsimile shall be sufficient for all purposes, and shall be 
binding upon any party who so executes.

<PAGE>

                                          45

                    SECTION 12.11  Survival of Representations.  All 
representations and warranties herein shall survive the dissolution and final 
liquidation of the Partnership.

                    SECTION 12.12  Entire Agreement.  This Agreement (and all 
Exhibits hereto) contains the entire understanding among the parties hereto 
and supersedes all prior written or oral agreements among them respecting the 
within subject matter, unless otherwise provided herein.  There are no 
representations, agreements, arrangements or understandings, oral or written, 
among the Partners hereto relating to the subject matter of this Agreement 
which are not fully expressed herein and in said Exhibits.

                    SECTION 12.13  Temporary Allocation. With respect to the 
period from inception of the Partnership through December 31, 2000, in lieu 
of the allocation provided by Section 5.2(A)(6), the portion of Profits 
resulting from Partnership operations for each fiscal year shall be allocated 
(x) 19.8% to the General Partner and (y) 80.2% to all Partners (including the 
General Partner, but other than the Preferred Limited Partners) in accordance 
with their Percentage Interests.  Profits from Partnership operations for a 
Fiscal Year shall mean the portion of Partnership Profits in excess of the 
amounts allocated pursuant to Sections 5.2(C) and (D) and 5.2(A)(1) through 
(5) of this Agreement, but shall not include Profits that arise from sales or 
dispositions of Partnership Assets, except in the ordinary course of 
business.  The foregoing allocation of Profits shall be considered to occur 
pursuant to Section 5.2(A) of this Agreement.

                    SECTION 12.14  Authorization and Consent.  The General 
Partner, each Limited Partner and each Preferred Limited Partner hereby 
authorizes the General Partner, in the name and on behalf of the Partnership, 
to execute, deliver and perform the Senior Secured Credit Agreement dated as 
of September 30, 1997 ("Credit Agreement") between Royale Investments, Inc.  
("Royale")  the Partnership, FCO Holdings, Inc., Blue Bell Investment 
Company, L.P.,  South Brunswick Investors, L.P. Comcourt Investors, L.P. and 
6385 Flank Drive, L.P., as Loan parties and Bankers Trust Company, as Banker 
and each of the Security Documents (as defined in the Credit Agreement) to 
which it is to be a party or by which it is to be bound and to execute and 
deliver in the name and on behalf of the Partnership such instruments, 
agreements and documents and to take or refrain from taking all such action 
as it in its sole discretion shall deem necessary, desirable or advisable in 
connection with the foregoing and in connection with the Formation Agreement.

                    SECTION 12.15  Merger.  The Partnership may merge with, 
or consolidate into, another business entity (as defined in Section 17-211(a) 
of the Act) upon approval by the General Partner and the Consent of the 
holders of a majority of each of the Partnership Units and the Preferred 
Units, voting separately.  In accordance with Section 17-211 of the Act 
(including Section 17-211(g)), notwithstanding anything to the contrary 
contained in this Agreement, an agreement of merger or consolidation approved 
by the General Partner and Consented to by the holders of a majority of each 
of the Partnership Units and the Preferred Units, voting separately, may (A) 
effect any amendment to this Agreement, or (B) effect the adoption of a new 
partnership agreement for the Partnership if it is the surviving or resulting 
limited partnership of the merger or consolidation.  Any amendment to this 
Agreement or adoption of a new partnership agreement made pursuant to the 
foregoing sentence shall be effective at the effective time or date of the 
merger or consolidation.  The provisions of this Sec-

<PAGE>

                                          46

tion shall not be construed to limit the accomplishment of a merger or of any 
of the matters referred to herein by any other means otherwise permitted by 
law.  

<PAGE>

                                          47

                    IN WITNESS WHEREOF, this Agreement has been duly executed 
and delivered by the parties hereto as of the day and year first above 
written.

General Partner:                   CORPORATE OFFICE PROPERTIES TRUST,
                                      as sole General Partner of the Partnership
                                   By:
                                          -----------------------------

LIMITED PARTNERS:


SHIDLER EQUITIES, L.P.

By:  SHIDLER EQUITIES CORP.
                    By:
                         ------------------------
                         Name:
                         Title:  

LBCW LIMITED PARTNERSHIP

By:
               ------------------------------------
               Clay W. Hamlin III, General Partner
               
- -----------------------------------------
Robert L. Denton
               
- -----------------------------------------
John E. de B. Blockey, Trustee of
   the John E. de B. Blockey
   Living Trust dated 9/12/88
               
- -----------------------------------------
Henry D. Bullock
               
- -----------------------------------------
Frederick K. Ito

<PAGE>

                                          48

- -----------------------------------------
Jay H. Shidler

- -----------------------------------------
Clay W. Hamlin III

- -----------------------------------------
James K. Davis

TIGER SOUTH BRUNSWICK, L.L.C.

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

WESTBROOK REAL ESTATE FUND I, L.P.

By:            WESTBROOK REAL ESTATE
                   PARTNERS MANAGEMENT I, L.L.C.

By:            WESTBROOK REAL ESTATE
                   PARTNERS, L.L.C.

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

<PAGE>

                                          49

               WESTBROOK REAL ESTATE
                  CO--INVESTMENT PARTNERSHIP T, L.P.

By:            WESTBROOK REAL ESTATE
                  PARTNERS MANAGEMENT I, L.L.C.

By:            WESTBROOK REAL ESTATE
                  PARTNERS L.L.C.

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

CHLB PARTNERSHIP

By:
               -------------------------------------
               Name:  Clay W. Hamlin III, General Partner

LGR INVESTMENT FUND, LTD. 

By:
               -------------------------------------
               Name:
- ------------------------------------------
Denise J. Liszewski

- ------------------------------------------
Samuel Tang

<PAGE>

                                          50

- ------------------------------------------
David P. Hartsfield

- ------------------------------------------
Lawrence J. Taff

- ------------------------------------------
Kimberly F.  Aquino

<PAGE>

                                          51


<TABLE>
<CAPTION>
                                                                                                                          Exhibit 1
                                 Schedule Of Partners

                                                      -----------------------------------------------------------------------------
                                                      No. of Units              Percentage Interest           Preferred Partnership
                                                                                                                       Units
                                                      -----------------------------------------------------------------------------
<S>                                                     <C>                      <C>                           <C>
  
General Partner


Corporate Office  . . . . . . . . . . . . . . . . . . . . . .  600,000                         20.6946%
Properties Trust

Limited Partners and Pre-
ferred Limited Partners

Jay H. Shidler  . . . . . . . . . . . . . . . . . . . . . . .    2,600                          0.0897%                     126,079

Shidler Equities, L.P.  . . . . . . . . . . . . . . . . . . .  582,103                         20.0773%                     457,826

Clay W. Hamlin, III . . . . . . . . . . . . . . . . . . . . .    5,235                          0.1805%                     115,334

LBCW Limited Partnership  . . . . . . . . . . . . . . . . . .  875,284                         30.1894%                     663,808

CHLB Partnership  . . . . . . . . . . . . . . . . . . . . . .   63,243                          2.1813%                      41,741

Robert L. Denton  . . . . . . . . . . . . . . . . . . . . . .  129,549                          4.4683%                      85,502

James K. Davis  . . . . . . . . . . . . . . . . . . . . . . .   15,368                          0.5300%                      10,142

John E. deB. Blockey, . . . . . . . . . . . . . . . . . . . .   89,549                          3.0886%                      59,102
Trustee of the John E. de
B. Blockey Living Trust
dated 9/12/88

Henry D. Bullock  . . . . . . . . . . . . . . . . . . . . . .   34,718                          1.1975%                      22,914

Frederick R. Ito  . . . . . . . . . . . . . . . . . . . . . .   17,359                          0.5987%                      11,457

LGR Investment Fund, Ltd. . . . . . . . . . . . . . . . . . .   80,030                          2.7603%                      52,820

Tiger South Brunswick,  . . . . . . . . . . . . . . . . . . .    2,875                          0.0992%                       1,898
L.L.C.

Westbrook Real Estate . . . . . . . . . . . . . . . . . . . .  336,121                         11.5931%                     221,840
Fund I, L.P.

Westbrook Real Estate   . . . . . . . . . . . . . . . . . . .   33,299                          1.1485%                      21,977
Co. Investment Partner-
ship I, L.P.
</TABLE>


<PAGE>

                                          2
<TABLE>
<CAPTION>

<S>                                                         <C>                            <C>                           <C>
Denise J. Liszewski . . . . . . . . . . . . . . . . . . . . .   10,227                          0.3527%                       6,750

Samuel Tang . . . . . . . . . . . . . . . . . . . . . . . . .    6,818                          0.2352%                       4,500

David P. Hartsfield . . . . . . . . . . . . . . . . . . . . .    9,091                          0.3136%                       6,000

Lawrence J. Taff  . . . . . . . . . . . . . . . . . . . . . .    4,091                          0.1411%                       2,700

Kimberly F. Acquino . . . . . . . . . . . . . . . . . . . . .    1,750                          0.0604%                       1,155
                                                            --------------                   -----------                 ----------
                                                             2,899,310                        100.0000%                   1,913,545
                                                            --------------                   -----------                 ----------
                                                            --------------                   -----------                 ----------
</TABLE>

<PAGE>



                       CORPORATE OFFICE PROPERTIES TRUST, L.P.
                                      EXHIBIT 2
                                          TO
                            LIMITED PARTNERSHIP AGREEMENT
                       Form of Redemption or Conversion Notice







<PAGE>


                                                                      Exhibit 2
                            Redemption [Conversion] Notice

                 The undersigned hereby irrevocably (i) elects to exercise 
its [redemption] [conversion] rights contained in ARTICLE IX of the Limited 
Partnership Agreement of Corporate Office Properties, L.P. (the "Partnership 
Agreement") with respect to an aggregate of ________ [Partnership Units] 
[Preferred Units], (ii) surrenders such [Partnership Units] [Preferred Units] 
and all right, title and interest therein and (iii) directs that the 
[REIT Shares (or applicable cash amount if so determined by the General Partner
in accordance with the Partnership Agreement)]
[Units of Limited Partner Interest] deliverable upon [redemption][conversion] 
of such [Partnership Units] [Preferred Units] be delivered to the address 
specified below.  Terms used above which are defined in the Partnership 
Agreement are used herein are defined therein.

Dated:

Name of Limited Partner or Preferred
  Limited Partner:   
Social Security or
Federal Employer ID Number:
                                    -------------------------------------------
                                    (Signature of Limited Partner or Preferred
                                                   Limited Partner)


                                    -------------------------------------------
                                                   (Street Address)


                                    -------------------------------------------
                                         (City)             (State)(Zip Code)


           Signature Guaranteed by:

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


<PAGE>


                       CORPORATE OFFICE PROPERTIES TRUST, L.P.
                                      EXHIBIT 3

                                          TO

                            LIMITED PARTNERSHIP AGREEMENT

              Form of Amended and Restated Registration Rights Agreement




<PAGE>

                                     EXHIBIT 10.17
                  AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT
                              Dated as of March 16, 1998

                                          of

                          CORPORATE OFFICE PROPERTIES TRUST

                                  for the benefit of

                   HOLDERS OF PARTNERSHIP UNITS AND PREFERRED UNITS

                                          of

                          CORPORATE OFFICE PROPERTIES, L.P.

                                         and

                   HOLDERS OF COMMON SHARES OF BENEFICIAL INTEREST

                                          of

                          CORPORATE OFFICE PROPERTIES TRUST



<PAGE>
                                          2

                  AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT

          THIS AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT (this 
"Agreement") is made and entered into as of March 16, 1998 by Corporate 
Office Properties Trust, a Maryland real estate investment trust (the 
"Company"), for the benefit of (w) the persons who own limited partnership 
units ("Partnership Units") and/or preferred units ("Preferred Units"), 
whether owned as of the date hereof or hereafter acquired, of Corporate 
Office Properties, L.P., a limited partnership formed under the Delaware 
Revised Uniform Limited Partnership Act (the "Partnership"), (x) Vernon Beck, 
Robert L. Denton, Clay W. Hamlin III, John Parsinen and Jay H. Shidler, (y) 
persons issued common shares of beneficial interest, par value $0.01 per 
share of the Company ("Common Shares") in exchange for shares of common 
stock, par value $0.01 per share (the "Common Stock"), of Royale Investments, 
Inc., a Minnesota corporation ("Royale"), pursuant to the Contribution 
Agreement (as defined below), and (z) the respective successors. assigns, 
transferees and estates of the persons identified in clauses (w), (x) and (y) 
(herein referred to collectively as the "Holders" and individually as a 
"Holder").  The Partnership Units and Preferred Units are herein sometimes 
collectively called the "Units."

          WHEREAS, on October [14], 1997 certain Holders become owners of 
Units in connection with the contributions (the "Contributions") of certain 
general and limited partnership interests and other assets to the Partnership 
pursuant to the Formation/Contribution Agreement dated as of September 7, 
1997 by and among the Company, H/SIC Corporation, Strategic Facility 
Investors, Inc., South Brunswick Investment Company, LLC, Comcourt investment 
Corporation and Gateway Shannon Development Corporation, as the same may at 
any time be amended, modified and supplemented and in effect (the 
"Contribution Agreement");

          WHEREAS, pursuant to the Partnership Agreement (as defined below) 
the Holders of Preferred Units have the right to convert them into 
Partnership Units as and to the extent set forth in the Partnership Agreement;

          WHEREAS, on October [14], 1997, Royale became the sole general 
partner of the Partnership and executed a registration rights agreement with 
terms substantially the same as this Agreement;

          WHEREAS, on October [14], 1997 certain Holders become owners of 
shares of Common Stock pursuant to the Contribution Agreement in 
consideration of assets transferred to the Company;

          WHEREAS, on the date hereof, the Company has succeeded by merger to 
all of the rights and obligations of Royale and each share of Common Stock 
has been converted into the right to receive one Common Share;

          WHEREAS, on the date hereof, the Common Shares are publicly held 
and traded and the Company is an issuer which is subject to the reporting 
requirements of the Securities Exchange Act of 1934, as amended from time to 
time (the "Exchange Act");

          WHEREAS, in connection with the foregoing, the Company wishes to 
confirm its obligations and has agreed, subject to the terms, conditions and 
limitations set forth in this Agreement, to provide the Holders with certain 
registration rights in respect of Common Shares either issued (x) pursuant to 
the Contribution Agreement or (y) upon redemption of Partnership Units as and 
to the extent set forth in that certain Limited Partnership Agreement of the 
Partnership dated October 14, 1997 among the sole general and initial limited 

<PAGE>

                                          3

partners party thereto, as the same has been, and may be further, amended, 
modified or supplemented from time to time and in effect (the "Partnership 
Agreement").

          NOW, THEREFORE, the Company and the Partnership for the benefit of 
the Holders each agrees as follows:

          Section 1.     Definitions.

          As used in this Agreement, the following capitalized defined terms 
shall have the following meanings:

          Commission:  The Securities and Exchange Commission.

          Common Shares:  Common shares of beneficial interest, $0.01 par 
value, of the Company.

          Contribution Agreement:  As set forth in the preamble.

          Contributions:  As set forth in the preamble.

          Exchange Act:  As set forth in the preamble.

          Holder or Holders:  As set forth in the preamble.

          Holders Entitled to Registration Rights:  As set forth in Section 
2(b).

          Indemnitee:  A Holder of Registerable Securities covered by a 
registration statement filed with the Commission as provided in this 
Agreement pursuant to Sections 2, 4 or 5 hereof.

          Majority Holders:  At any time, Holders of Registrable Securities, 
Preferred Units then convertible into Partnership Units and Partnership Units 
then redeemable for Registrable Securities who, if all such Preferred Units 
were converted and all such Partnership Units were so redeemed, would then 
hold a majority of the Registrable Securities.

          Minimum Registrable Amount:  At any date of determination, 
Registrable Securities having an aggregate fair market value of at least $3 
million.

          NASD:  The National Association of Securities Dealers, Inc.

          Partnership:  As set forth in the preamble.

          Partnership Agreement:  As set forth in the preamble.

          Partnership Units:  As set forth in the Partnership Agreement.

          Person:  Any individual, partnership, corporation, limited 
liability company, trust or other legal entity.

          Preferred Units:  As set forth in the Partnership Agreement.

<PAGE>

                                          4

          Prospectus:  A prospectus included in a Registration Statement, 
including any preliminary prospectus, and any such prospectus as amended or 
supplemented by any prospectus supplement with respect to the terms of the 
offering of any portion of the Registrable Securities covered by such 
Registration Statement, and by all other amendments and supplements to such 
prospectus, including post-effective amendments, and in each case including 
all material incorporated by reference therein.

          Registrable Securities:  The Shares, excluding (i) Shares as to 
which a Registration Statement shall have become effective under the 
Securities Act pursuant to Section 2, 3 or 4 of this Agreement and which 
shall have been disposed of under such Registration Statement, (ii) Shares 
sold or otherwise distributed pursuant to Rule 144 under the Securities Act 
and (iii) Shares as to which registration under the Securities Act is not 
required to permit the sale thereof to the public.

          Sale Period:  The 45-day period immediately following the filing 
with the Commission by the Company of an annual report of the Company on Form 
10-K or a quarterly report of the Company on Form 10-Q or such other period 
as the Company may determine from time to time.

          Securities Act:  The Securities Act of 1933, as amended from time 
to time.

          Shares:  The Common Shares issued to Holders of Partnership Units 
upon redemption of their Partnership Units pursuant to the Partnership 
Agreement or to Holders pursuant to the Contribution Agreement.

          Shelf Registration:  A "shelf" registration of the Registrable 
Securities under Rule 415 under the Securities Act.

          Shelf Registration Statement:  Shall mean a "shelf" registration 
statement of the Company and any other entity required to be a registrant 
with respect to such shelf registration statement pursuant to the 
requirements of the Securities Act which covers all of the Registrable 
Securities then issued and outstanding or which may thereafter be issued in 
redemption of any Partnership Units (including, without limitation, Units 
issuable upon conversion of Preferred Units) on an appropriate form under 
Rule 415 under the Securities Act, or any similar rule that may be adopted by 
the Commission, and all amendments and supplements to such registration 
statement, including post-effective amendments, in each case including the 
Prospectus contained therein, all exhibits thereto and all materials 
incorporated by reference therein.

          Units:  Preferred Units and Partnership Units, collectively.

          Section 2.     Shelf Registration Under the Securities Act.

          (a)  Filing of Shelf Registration Statement.  By August [14], 1998 
and by each March 31 after such initial filing, the Company shall cause to be 
filed a Shelf Registration Statement covering the sale by the then Holders of 
all of the Registrable Securities then held by them in accordance with the 
terms hereof and will use its reasonable best efforts to cause each such 
Shelf Registration Statement to be declared effective by the Commission as 
soon as reasonably practicable.  The Company agrees to use its reasonable 
best efforts to keep each such Shelf Registration Statement continuously 
effective under the Securities Act until such time as the aggregate number of 
Registrable Securities covered by all such Shelf Registration Statements and 
then outstanding (computed for this purpose as if all outstanding Preferred 
Units have been converted into Partnership Units and all thereafter 
outstanding Partnership Units have been redeemed for Common Shares) is less 
than 5% of the then outstanding Common Shares (computed as aforesaid and 
including, without limitation, Common Shares issuable in respect of Retained 
Interests (as defined in the Contribution Agreement)), and further agrees 

<PAGE>

                                          5

to supplement or amend each such Shelf Registration Statement, if and as 
required by the rules, regulations or instructions applicable to the 
registration form used by the Company for such Shelf Registration Statement 
or by the Securities Act or by any other rules and regulations thereunder for 
a Shelf Registration.  Each Holder who sells Shares as part of any such Shelf 
Registration shall be deemed to have agreed to all of the terms and 
conditions of this Agreement and to have agreed to perform any an all 
obligations of a Holder hereunder.

          (b)  Inclusion in Shelf Registration Statement.  Not later than 30 
days prior to filing the Shelf Registration Statement with the Commission, 
the Company shall notify each then Holder of Registrable Securities 
(including any Person who is then entitled to become a Holder pursuant to the 
Partnership Agreement by reason of owning Units or Preferred Units, 
including, without limitation, Persons holding Retained Interests) ("Holders 
Entitled to Registration Rights") of its intention to make such filing and 
request advice from each such Holder as to whether such Holder desires to 
have Registrable Securities held by it or which it is entitled to receive not 
later than the last day of the first Sale Period occurring in whole or in 
part after the date of such notice included in the Shelf Registration 
Statement at such time; provided, however, that the Company shall not be 
required to so notify any such Holder in respect of Registrable Securities 
previously registered pursuant to a Shelf Registration Statement filed in 
accordance with this Section 2 which such Holder could then dispose of 
pursuant to such Registrable Securities.  Any such Holder who is so notified 
and does not provide the information reasonably requested by the Company in 
connection with the preparation of the Shelf Registration Statement as 
promptly as practicable after receipt of such notice, but in no event later 
than 20 days thereafter, shall not be entitled to have its Registrable 
Securities included in such Shelf Registration Statement at the time it 
becomes effective, but shall have the right thereafter to deliver to the 
Company a Registration Notice as contemplated by Section 3(b).

          Section 3.     Shelf Registration Procedures.

          In connection with the obligations of the Company with respect to 
each Shelf Registration Statement pursuant to Section 2 hereof, the Company 
shall:

          (a)  prepare and file with the SEC, within the time period set forth 
     in Section 2(a) hereof, a Shelf Registration Statement, which Shelf 
     Registration Statement (i) shall be available for the sale of the 
     Registrable Securities covered thereby in accordance with the intended 
     method or methods of distribution by the selling Holders thereof and (ii) 
     shall comply as to form in all material respects with the requirements of 
     the applicable form and include all financial statements required by the 
     Commission to be filed therewith.

          (b)  subject to the last three sentences of this Section 3(b) and to
     Section 3(i) hereof, (i) prepare and file with the Commission such 
     amendments and post-effective amendments to such Shelf Registration 
     Statement as may be necessary to keep such Shelf Registration Statement
     effective for the applicable period; (ii) cause each Prospectus to be 
     supplemented by any required prospectus supplement, and as so supplemented
     to be filed pursuant to Rule 424 or any similar rule that may be adopted 
     under the Securities Act; (iii) respond promptly to any comments received
     from the Commission with respect to such Shelf Registration Statement, or 
     any amendment, post-effective amendment or supplement relating thereto; and
     (iv) comply with the provisions of the Securities Act with respect to the 
     disposition of all securities covered by such Shelf Registration
     Statement during the applicable period in accordance with the intended 
     method or methods of distribution by the selling Holders thereof.  
     Notwithstanding anything to the contrary contained herein, the Company 
     shall not be required to take any of the actions described in clauses (i),
     (ii) or (iii) above with respect to a particular Holder of Registrable 
     Securities unless and until the Company has received either a written 
     notice (a "Registration No-

<PAGE>

                                          6

     tice") from such Holder that it intends to make offers or sales under such
     Shelf Registration Statement as specified in such Registration Notice or a
     written response from such Holder of the type contemplated by Section 2(b);
     provided, however, that the Company shall have 7 business days to prepare 
     and file any such amendment or supplement after receipt of a Registration 
     Notice.  Once a Holder has delivered such a written response or a 
     Registration Notice to the Company, such Holder shall promptly provide to 
     the Company such information as the Company reasonably requests in order to
     identify such Holder and the method of distribution in a post-effective 
     amendment to such Shelf Registration Statement or a supplement to a 
     Prospectus.  Offers or sales under such Shelf Registration Statement may be
     made only during a Sale Period.  Such Holder also shall notify the Company 
     in writing upon completion of such offer or sale or at such time as such 
     Holder no longer intends to make offers or sales under such Shelf 
     Registration Statement.

          (c)  furnish to each Holder of Registrable Securities that has 
     delivered a Registration Notice to the Company, without charge, as many
     copies of each applicable Prospectus, including each preliminary 
     Prospectus, and any amendment or supplement thereto and such other 
     documents as such Holder may reasonably request, in order to facilitate 
     the public sale or other disposition of the Registrable Securities; 
     the Company consents to the use of such Prospectus, including each 
     preliminary Prospectus, by each such Holder of Registrable
     Securities in connection with the offering and sale of the Registrable
     Securities covered by such Prospectus or the preliminary Prospectus.

          (d)  use its reasonable best efforts to register or qualify the 
     Registrable Securities covered thereby by the time such Shelf Registration
     Statement is declared effective by the Commission under all applicable 
     state securities or "blue sky" laws of such jurisdictions as any Holder
     of Registrable Securities covered by such Shelf Registration Statement 
     shall reasonably request in writing, keep each such registration or 
     qualification effective during the period such Shelf Registration 
     Statement is required to be kept effective or during the period offers
     or sales are being made by a Holder that has delivered a Registration 
     Notice to the Company, whichever is shorter, and do any and all
     other acts and things which may be reasonably necessary or advisable to
     enable such Holder to consummate the disposition in each such 
     jurisdiction of such Registrable Securities then owned by such Holder
     (after giving effect to the redemption of Partnership Units then held
     by such Holder); provided, however, that the Company shall not be 
     required (i) to qualify generally to do business in any jurisdiction 
     or to register as a broker or dealer in such jurisdiction where it would
     not be required so to qualify or register but for this Section
     3(d), (ii) to subject itself to taxation in any such jurisdiction or (iii)
     to submit to the general service of process in any such jurisdiction.

          (e)  notify each Holder when such Shelf Registration Statement has 
    become effective and notify each Holder of Registrable Securities that has
    delivered a Registration Notice to the Company promptly and, if requested 
    by such Holder, confirm such advice in writing (i) when any post-effective
    amendments and supplements to such Shelf Registration Statement become 
    effective, (ii) of the issuance by the Commission or any state securities 
    authority of any stop order suspending the effectiveness of such Shelf 
    Registration Statement or the initiation of any proceedings for that 
    purpose, (iii) if the Company receives any notification with respect to 
    the suspension of the qualification of the Registrable Securities for sale
    in any jurisdiction or the initiation of any proceeding for such purpose and
    (iv) of the happening of any event during the period such Shelf Registration
    Statement is effective as a result of which such Shelf Registration 
    Statement or a related Prospectus contains any untrue statement of a 
    material fact or omits to state any material fact required to be stated 
    therein or necessary to make the statements therein (in the case of the
    Prospectus, in light of the circumstances under which they were made) not
    misleading.

<PAGE>

                                          7

           (f)  make every reasonable effort to obtain the withdrawal of any 
     order suspending the effectiveness of such Shelf Registration Statement 
     at the earliest possible moment.

           (g)  furnish to each Holder of Registrable Securities covered 
     thereby that has delivered a Registration Notice to the Company, without 
     charge, at least one conformed copy of such Shelf Registration Statement 
     and any post-effective amendment thereto (without documents incorporated 
     therein by reference or exhibits thereto, unless requested).

           (h)  cooperate with the selling Holders of Registrable Securities 
     covered thereby to facilitate the timely preparation and delivery of 
     certificates representing Registrable Securities to be sold and not 
     bearing any Securities Act legend; and enable certificates for such 
     Registrable Securities to be issued for such numbers of shares and 
     registered in such names as the selling Holders may reasonably request 
     at least two business days prior to any sale of Registrable Securities.

           (i)  subject to the last three sentences of Section 3(b) hereof, 
     upon the occurrence of any event contemplated by Section 3(e)(iv) 
     hereof, use its reasonable best efforts promptly to prepare and file a 
     supplement or prepare, file and obtain effectiveness of a post-effective 
     amendment to such Shelf Registration Statement or a related Prospectus 
     or any document incorporated therein by reference or file any other 
     required document so that, as thereafter delivered to the purchasers of 
     the Registrable Securities, such Prospectus will not contain any untrue 
     statement of a material fact or omit to state a material fact required 
     to be stated therein or necessary to make the statements therein, in the 
     light of the circumstances under which they were made, not misleading.

           (j)  make available for inspection by representatives of the 
     Holders of the Registrable Securities and any counsel or accountant 
     retained by such Holders, all financial and other records, pertinent 
     corporate documents and properties of the Company, and cause the 
     respective officers, directors and employees of the Company to supply 
     all information reasonably requested by any such representative, counsel 
     or accountant in connection with such Shelf Registration Statement; 
     provided, however, that such records, documents or information which the 
     Company determines in good faith to be confidential, and notifies such 
     representatives, counsel or accountants in writing that such records, 
     documents or information are confidential, shall not be disclosed by the 
     representatives, counsel or accountants unless (i) the disclosure of 
     such records, documents or information is necessary to avoid or correct 
     a material misstatement or omission in such Shelf Registration 
     Statement, (ii) the release of such records, documents or information is 
     ordered pursuant to a subpoena or other order from a court of competent 
     jurisdiction or (iii) such records, documents or information have been 
     generally made available to the public otherwise than in violation of 
     this Agreement.

           (k)  a reasonable time prior to the filing of any Prospectus, any 
     amendment to such Shelf Registration Statement or amendment or 
     supplement to a Prospectus, provide copies of such document (not 
     including any documents incorporated by reference therein unless 
     requested) to the Holders of Registrable Securities that have provided a 
     Registration Notice to the Company.

           (l)  use its reasonable best efforts to cause all Registrable 
     Securities to be listed on any securities exchange on which similar 
     securities issued by the Company are then listed.

           (m)  obtain a CUSIP number for all Registrable Securities, not 
     later than the effective date of such Shelf Registration Statement.

<PAGE>

                                          8

           (n)  otherwise use its reasonable efforts to comply with all 
     applicable rules and regulations of the Commission and make available to 
     its security holders, as soon as reasonably practicable, an earnings 
     statement covering at least 12 months which shall satisfy the provisions 
     of Section 11(a) of the Securities Act and Rule 158 thereunder.

           (o)  use its reasonable best efforts to cause the Registrable 
     Securities covered by such Shelf Registration Statement to be registered 
     with or approved by such other governmental agencies or authorities as 
     may be necessary by virtue of the business and operations of the Company 
     to enable Holders that have delivered Registration Notices to the 
     Company to consummate the disposition of such Registrable Securities.

           The Company may require each Holder of Registrable Securities to 
     furnish to the Company in writing such information regarding the 
     proposed distribution by such Holder of such Registrable Securities as 
     the Company may from time to time reasonably request in writing.

           In connection with and as a condition to the Company's obligations 
     with respect to any Shelf Registration Statement pursuant to Section 2 
     hereof and this Section 3, each Holder agrees with the Company that:

           (i)  it will not offer or sell its Registrable Securities under a
     Shelf Registration Statement until (A) it has either (1) provided a
     Registration Notice pursuant to Section 3(b) hereof or (2) had Registrable
     Securities included in such Shelf Registration Statement at the time it
     became effective pursuant to Section 2(b) hereof and (B) it has received
     copies of the supplemented or amended Prospectus contemplated by Section
     3(b) hereof and receives notice that any post-effective amendment has
     become effective;

           (ii) upon receipt of any notice from the Company of the happening 
     of anv event of the kind described in Section 3(b)(iv) hereof, such 
     Holder will forthwith discontinue disposition of Registrable Securities 
     pursuant to such Shelf Registration Statement until such Holder receives 
     copies of the supplemented or amended Prospectus contemplated by Section 
     3(i) hereof and receives notice that any post-effective amendment has 
     become effective, and, if so directed by the Company, such Holder will 
     deliver to the Company (at the expense of the Company) all copies in its 
     possession, other than permanent file copies then in such Holder's 
     possession, of the Prospectus covering such Registrable Securities 
     current at the time of receipt of such notice;

           (iii) all offers and sales under such Shelf Registration Statement 
     shall be completed within forty-five (45) days after the first date on 
     which offers or sales can be made pursuant to clause (i) above, and upon 
     expiration of such forty-five (45) day period the Holder will not offer 
     or sell its Registrable Securities under the Shelf Registration 
     Statement until it has again complied with the provisions of clauses 
     (i)(A)(1) and (B) above, except that if the applicable Registration 
     Notice was delivered to the Company at a time which was not part of a 
     Sale Period, such forty-five (45) day period shall be the next 
     succeeding Sale Period;

           (iv) if the Company determines in its good faith judgment, after 
     consultation with counsel, that the filing of a Shelf Registration 
     Statement under Section 2 hereof or the use of any Prospectus would 
     require the disclosure of important information which the 

<PAGE>

                                          9

     Company has a bona fide business purpose for preserving as confidential 
     or the disclosure of which would impede the Company's ability to 
     consummate a significant transaction, upon written notice of such 
     determination by the Company, the rights of the Holders to offer, sell 
     or distribute any Registrable Securities pursuant to a Shelf 
     Registration Statement or Prospectus or to require the Company to take 
     action with respect to the registration or sale of any Registrable 
     Securities pursuant to a Shelf Registration Statement (including any 
     action contemplated by this Section 3) will be suspended until the date 
     upon which the Company notifies the Holders in writing that suspension 
     of such rights for the grounds set forth in this paragraph is no longer 
     necessary; provided, however, that the Company may not suspend such 
     rights for an aggregate period of more than 90 days in any 12-month 
     period; and

           (v)  in the case of the registration of any underwitten equity 
     offering proposed by the Company (other than any registration by the 
     Company on Form S-8, or a successor or substantially similar form, of 
     (i) an employee stock option, stock purchase or compensation plan or of 
     securities issued or issuable pursuant to any such plan or (ii) a 
     dividend reinvestment plan), such Holder will agree, if requested in 
     writing by the managing underwriter or underwriters administering such 
     offering, not to effect any offer, sale or distribution of any 
     Registrable Securities (or any option or right to acquire Registrable 
     Securities) (each, a "Transfer") during the period commencing on the 
     10th day prior to the expected effective date (which date shall be 
     stated in such notice) of the registration statement covering such 
     underwritten primary equity offering or, if such offering shall be a 
     "take-down" from an effective shelf registration statement, the 10th day 
     prior to the expected commencement date (which date shall be stated in 
     such notice) of such offering, and ending on the date specified by such 
     managing underwriter in such written request to such Holder; provided, 
     however, that no Holder shall be required to agree not to Transfer its 
     Registrable Securities for a period of time which is longer than the 
     greater of 90 days or the period of time for which any senior executive 
     of the Company is required so to agree in connection with such offering. 
      Nothing in this paragraph shall be read to limit the ability of any 
     Holder to redeem its Partnership Units for Common Shares in accordance 
     with the Partnership Agreement.

          Section 4.     Piggyback Registration.

          (a)  Right to Piggyback.  Whenever on or after August [14], 1998 
(x) the Company proposes to register any Common Shares (or securities 
convertible into or exchangeable or exercisable for such Common Shares) under 
the Securities Act for its own account or the account of any shareholder of 
the Company (other than offerings pursuant to employee plans, or noncash 
offerings in connection with a proposed acquisition, exchange offer, 
recapitalization or similar transaction) and (y) the registration form may be 
used for the registration of Registrable Securities (a "Piggyback 
Registration"), the Company will give prompt written notice to all of the 
Holders of Common Shares or Units outstanding on the date hereof (the 
"Original Holders") of its intention to effect such a registration and will, 
subject to Section 4(b) and Section 10 hereof, include in such registration 
all Registrable Securities with respect to which such Original Holders 
request in writing to be so included within 20 days after the receipt of the 
Company's notice; provided, however, that the Company shall not be required 
to give such notice or to effect such registration in respect of any 
Registerable Securities which have been, or are in the process of being, 
registered pursuant to any Shelf Registration Statement.

          (b)  Priority.  If a registration pursuant to this Section 4 
involves an underwritten offering and the managing underwriter advises the 
Company in good faith that in its opinion the number of securities requested 
to be included in such registration exceeds the number which can be sold in 
such offering without 

<PAGE>

                                          10

having an adverse effect on such offering, including the price at which such 
securities can be sold, then the Company will be required to include in such 
registration the maximum number of shares that such underwriter advises can 
be so sold, allocated (x) first, to the securities the Company proposes to 
sell, (y) second, among the Common Shares requested to be included in such 
registration by the Original Holders (other than Registrable Securities 
previously registered pursuant to a Shelf Registration Statement filed in 
accordance with Section 2 hereof under which such Original Holder could then 
dispose of such Registrable Securities), considered in the aggregate (if such 
registration was initiated by the Company), and any other shareholder of the 
Company with Common Shares eligible for registration, pro rata, on the basis 
of the number of Common Shares such holder requests be included in such 
registration, and (z) third, among other securities, if any, requested and 
otherwise eligible to be included in such registration.

          (c)  Nothing contained herein shall prohibit the Company from 
determining, at any time, not to file a registration statement or, if filed, 
to withdraw such registration or terminate or abandon the registration 
related thereto.

          Section 5.     Requested Registration.

          (a)  Right to Request Registration.  Upon the written request of 
Original Holders owning 6% or more of the outstanding Registrable Securities 
then owned in the aggregate by such Holders (the "Requesting Holders") 
(computed for these purposes as if all Preferred Units have been converted 
into Partnership Units and thereafter all outstanding Partnership Units have 
been redeemed for Common Shares), requesting that the Company effect the 
registration under the Securities Act of at least the Minimum Registration 
Amount, the Company shall use its best efforts to effect, as expeditiously as 
possible, following the prompt (but in no event later than 15 days following 
the receipt of such written request) delivery of notice to all Original 
Holders, the registration under the Securities Act of such number of shares 
of Registrable Securities owned by the Requesting Holders and requested by 
the Requesting Holders to be so registered (subject to Section 5(c) hereof), 
together with (x) all other Common Shares entitled to registration, and (y) 
securities of the Company which the Company elects to register and offer for 
its own account; provided, however, that the Company shall not be required to 
(i) subject to Section 5(b) below, effect more than a total of three such 
registrations pursuant to this Agreement, (ii) file a registration statement 
relating to a registration request pursuant hereto within a period of six 
months after the effective date of any other registration statement of the 
Company requested hereunder (other than pursuant to Section 2) or pursuant to 
which the Requesting Holders shall have been given an opportunity to 
participate pursuant to Section 4 hereof and which opportunity they declined 
or which registration statement under Section 4 hereof included shares of 
Registrable Securities owned by Holders Entitled to Registration Rights (so 
long as such registration statement became and was effective for sufficient, 
time to permit the sales contemplated thereby) or (iii) file a registration 
statement relating to the registration of Registerable Securities which are 
already being registered pursuant to a Shelf Registration Statement; provided 
further, that the Company shall not be required to file a registration 
statement relating to an offering of Common Shares on a delayed or continuous 
basis pursuant to Rule 415 (or any successor rule to similar effect) 
promulgated under the Securities Act if the Company is not, at the time, 
eligible to register Common Shares on Form S-3 (or a successor form).

          Notwithstanding the foregoing, if the Board of Directors of the 
Company determines in its good faith judgment, (x) after consultation with a 
nationally recognized investment banking fim, that there will be an adverse 
effect on a then contemplated public offering of the Company's securities, 
(y) that the disclosures that would be required to be made by the Company in 
connection with such registration would be materially harmful to the Company 
because of transactions then being considered by, or other events then 
concerning, the Company, or (z) the registration at the time would require 
the inclusion of pro forma or other information, which requirements the 
Company is reasonably unable to comply with, then the Company may defer the 
filing (but not 

<PAGE>

                                          11

the preparation) of the registration statement which is required to effect 
any registration pursuant to this Section 5 for a reasonable period of time, 
but not in excess of 90 calendar days (or any longer period agreed to by the 
Holders Entitled to Registration Rights), provided that at all times the 
Company is in good faith using all reasonable efforts to file such 
registration statement as soon as practicable.

          (b)  Effective Registration.  A registration requested pursuant to 
this Section 5 shall not be deemed to have been effected (and, therefore, not 
requested for purposes of Section 5(a) above) (w) unless the registration 
statement relating thereto has become effective under the Securities Act, (x) 
if after it has become effective such registration is interfered with by any 
stop order, injunction or other order or requirement of the Commission or 
other governmental agency or court for any reason other than a 
misrepresentation or an omission by a Holder and, as a result thereof, the 
shares of Registrable Securities requested to be registered cannot be 
completely distributed in accordance with the plan of distribution, (y) if 
the conditions to closing specified in the purchase agreement or underwriting 
agreement entered into in connection with such registration are not satisfied 
or waived other than by reason of some act or omission by a participating 
Holder or (z) if with respect to what would otherwise be deemed the third, or 
last, request under Section 5(a) hereof, less than all of the Common Shares 
that the Original Holders requested be registered were actually registered 
due to the operation of Section 5(c) hereof; provided that clause (z) above 
may not be invoked by the Original Holders unless (I) such request includes 
at least the Minimum Registration Amount or (II) if such request includes an 
amount that is less than the Minimum Registration Amount, Rule 144 under the 
Securities Act is not available to the Original Holders for the sale of all 
of the Common Shares owned by the Original Holders; and provided further that 
clause (z) above may be invoked only at the request of Original Holders 
meeting the foregoing requirements and owning more than 10% of the shares of 
Registrable then owned (computed as aforesaid) in the aggregate by the 
Original Holders.

          (c)  Priority.  If a requested registration pursuant to this 
Section 5 involves an underwritten offering and the managing underwriter 
shall advise the Company that in its opinion the number of securities 
requested to be included in such registration exceeds the number which can be 
sold in such offering without having an adverse effect on such offering, 
including the price at which such securities can be sold, then the Company 
will be required to include in such registration the maximum number of shares 
that such underwriter advises can be so sold, allocated (x) first, among all 
Common Shares requested by the Original Holders to be included in such 
registration, pro rata on the basis of the number of Common Shares then owned 
by each of them (or, if such holder requests that less than all of the Common 
Shares owned by such holder be included in such registration, such lesser 
number of shares) (y) second, to any securities requested to be included in 
such registration by any other shareholder of the Company having registration 
rights and (z) third, to any securities the Company proposes to sell.

          Section 6.  Registration Procedures.  If and whenever the 
Company is required to use its best efforts to effect or cause the 
registration of any Registrable Securities under the Securities Act as 
provided in this Agreement pursuant to Section 4 or 5 hereof, the Company 
shall:

          (a)  prepare and file with the Commission as expeditiously as 
     possible but in no event later than 90 days after receipt of a request 
     for registration with respect to such Registrable Securities, a 
     registration statement on any form for which the Company then qualifies 
     or which counsel for the Company shall deem appropriate, which form 
     shall be available for the sale of the Registrable Securities in 
     accordance with the intended methods of distribution thereof, and use 
     its best efforts to cause such registration statement to become 
     effective; provided that before filing with the Commission a 
     registration statement or prospectus or any amendments or supplements 
     thereto, including documents incorporated by reference after the initial 
     filing of any registration statement, the Company shall (x) fur-

<PAGE>

                                          12

     nish to each participating Holder and to one firm of attorneys selected 
     collectively by the participating Holders and the holders of other 
     securities covered by such registration statement, but in no event to 
     more than one such counsel for all such selling securityholders, copies 
     of all such documents proposed to be filed, which documents shall be 
     subject to the review of the participating Holders and such counsel, and 
     (y) notify the participating Holders of any stop order issued or 
     threatened by the Commission and take all reasonable actions required to 
     prevent the entry of such stop order or to remove it if entered;

          (b)  prepare and file with the Commission such amendments and 
     supplements to such registration statement and the prospectus used in 
     connection therewith as may be necessary to keep such registration 
     statement effective for a period of not less than 180 days or such 
     shorter period which shall terminate when all Registrable Securities 
     covered by such registration statement have been sold (but not before 
     the expiration of the 90-day period referred to in Section 4(3) of the 
     Securities Act and Rule 174, or any successor thereto, thereunder, if 
     applicable), and comply with the provisions of the Securities Act with 
     respect to the disposition of all securities covered by such 
     registration statement during such period in accordance with the 
     intended methods of disposition by the sellers thereof set forth in such 
     registration statement;

          (c)  furnish, without charge, to the participating Holders and each 
     underwriter, if any, such number of copies of such registration 
     statement, each amendment and supplement thereto (including one 
     conformed copy to each participating Holder and one signed copy to each 
     managing underwriter and in each case including all exhibits thereto), 
     and the prospectus included in such registration statement (including 
     each preliminary prospectus), in conformity with the requirements of the 
     Securities Act, and such other documents as the participating Holders 
     may reasonably request in order to facilitate the disposition of the 
     Registrable Securities registered thereunder;

          (d)  use its best efforts to register or qualify such Registrable 
     Securities covered by such registration statement under such other 
     securities or blue sky laws of such jurisdiction as the participating 
     Holders, and the managing underwriter, if any, reasonably requests and 
     do any and all other acts and things which may be reasonable necessary 
     or advisable to enable the participating Holders and each underwriter, 
     if any, to consummate the disposition in such jurisdiction of the 
     Registrable Securities registered thereunder; provided that the Company 
     shall not be required to (x) qualify generally to do business in any 
     jurisdiction where it would not otherwise be required to qualify but for 
     this Section 6(d), (y) subject itself to taxation in any such 
     jurisdiction or (z) consent to general service of process in any such 
     jurisdiction;

          (e)  use its best efforts to cause the Registrable Securities 
     covered by such registration statement to be registered with or approved 
     by such insurance regulatory authorities may be necessary by virtue of 
     the business and operations of the Company to enable the participating 
     Holders and other holders, if any, of securities covered by such 
     registration statement to consummate the disposition of Registrable 
     Securities registered thereunder;

          (f)  immediately notify the managing underwriter, if any, and the 
     participating Holders at any time when a prospectus relating thereto is 
     required to be delivered under the Securities Act, of the happening of 
     any event which comes to the Company's attention if as a result of such 
     event the prospectus included in such registration statement contains an 
     untrue statement of a material fact or omits to state any material fact 
     required to be stated therein or necessary to make the statements 
     therein not misleading, and the Company shall promptly prepare and 
     furnish to the participating Holders and any 

<PAGE>

                                          13

     other holder of securities covered by such registration statement and 
     prospectus a supplement or amendment to such prospectus so that as 
     thereafter delivered, such prospectus shall not contain an untrue 
     statement of a material fact or omit to state any material fact required 
     to be stated therein or necessary to make the statements therein not 
     misleading; provided, however, that if the Company determines in good 
     faith that the disclosure that would be required to be made by the 
     Company would be materially harmful to the Company because of 
     transactions then being considered by, or other events then concerning, 
     the Company, or a supplement or amendment to such prospectus at such 
     time would require the inclusion of pro forma or other information, 
     which requirement the Company is reasonably unable to comply with, then 
     the Company may defer for a reasonable period of time, not to exceed 90 
     days, furnishing to the participating Holders and any other holder of 
     securities covered by such registration statement and prospectus a 
     supplement or amendment to such prospectus; provided, further, that at 
     all times the Company is in good faith using all reasonable efforts to 
     file such amendment as soon as practicable,

          (g)  use its best efforts to cause all such securities being 
     registered to be listed on each securities exchange on which similar 
     securities issued by the Company are then listed, and enter into such 
     customary agreements including a listing application and indemnification 
     agreement in customary form (provided that the applicable listing 
     requirements are satisfied), and to provide a transfer agent and 
     register for such Registrable Securities covered by such registration 
     statement no later than the effective date of such registration 
     statement;

          (h)  make available for inspection by any of the participating 
     Holders and any holder of securities covered by such registration 
     statement, any underwriter participating in any distribution pursuant to 
     such registration statement, and any attorney, accountant or other agent 
     retained by such persons (collectively, the "Inspectors"), all financial 
     and other records of the Company and its subsidiaries (collectively, 
     "Records"), if any, as shall be reasonably necessary to enable them to 
     exercise their due diligence responsibility, and cause the Company's and 
     its subsidiaries' officers, directors and employees to supply all 
     information and respond to all inquiries reasonably requested by any 
     such Inspector in connection with such registration statement.  
     Notwithstanding the foregoing, the Company shall have no obligation to 
     disclose any Records to the Inspector in the event the Company 
     determines that such disclosure is reasonably likely to have an adverse 
     effect on the Company's ability to assert the existence of an 
     attorney-client privilege with respect thereto;

          (i)  if requested, use its best efforts to obtain a "cold comfort" 
     letter and a "bring-down cold comfort" letter from the Company's 
     independent public accountants in customary form and covering such 
     matters of the type customarily covered by such letters;

          (j)  enter into a form of underwriting agreement that contains 
     customary terms and provisions for similar securities offerings;

          (k)  make available senior management personnel to participate in, 
     and cause them to cooperate with the underwriters in connection with, 
     "road show" and other customary marketing activities, including 
     "one-on-one" meetings with prospective purchasers of the Registrable 
     Securities; and

          (l)  otherwise use its best efforts to comply with all applicable 
     rules and regulations of the Commission, and make available to its 
     security holders, as soon as reasonably practicable, an earnings 
     statement covering a period of at least 12 months, beginning with the 
     first month after the effective date of the registration statement (as 
     the term "effective date" is defined in Rule 158(c) under the Securities 

<PAGE>

                                          14

     Act), which earnings statement shall satisfy the provisions of Section 
     11 (a) of the Securities Act and Rule 158 thereunder.

     It shall be a condition precedent to the obligation of the Company to 
take any action pursuant to this Agreement in respect of Registrable 
Securities which are to be registered at the request of any of the 
participating Holders that the participating Holders shall fumish to the 
Company such information regarding the securities held by the participating 
Holders and the intended method of disposition thereof as the Company shall 
reasonably request and as shall be required in connection with the action 
taken by the Company.

     Each of the Holders agrees that, upon receipt of any notice from the 
Company of the happening of any event of the kind described in Section 6(f) 
hereof, the Holders shall discontinue disposition of Registrable Securities 
pursuant to the registration statement covering such Registrable Securities 
until receipt of the copies of the supplemented or amended prospectus 
contemplated by Section 6(f) hereof or until otherwise notified by the 
Company, and, if so directed by the Company, the participating Holders shall 
deliver to the Company (at the Company's expense) all copies (including, 
without limitation, any and all drafts), other than permanent file copies, 
then in any participating Holder's possession, of the prospectus covering 
such Registrable Securities at the time of receipt of such notice.  In the 
event the Company shall give any such notice, the period specified in Section 
6(b) hereof shall be extended by the greater of (x) three months of (y) the 
number of days during the period from and including the date of the giving of 
such notice pursuant to Section 6(f) hereof to and including the date when 
each of the participating Holders shall have received the copies of the 
supplemented or amended prospectus contemplated by, Section 6(f) hereof.

     Section 7.     Selection or Underwriters.  If any offering pursuant to a 
registration statement is to be an underwritten offering, the Company will 
select a managing underwriter or underwriters to administer the offering, 
provided that in the case of a registration statement pursuant to Section 5 
hereof, the Original Holders holding more than 50% of the shares of 
Registrable Securities held by the Original Holders to be included in such 
underwritten offering shall select the managing underwriter or underwriters, 
subject to the consent of the Company which consent shall not be unreasonably 
withheld or delayed.

     Section 8.     Registration Expenses.  The Company shall pay, in 
connection with any registration pursuant to Section 2, 4 or 5, the following 
registration expenses incurred in connection therewith: (i) all Commission, 
stock exchange or NASD registration and filing fees, (ii) all fees and 
expenses of compliance with securities or blue sky laws (including reasonable 
fees and disbursements of counsel in connection with the blue sky 
qualifications of the Registrable Securities), (iii) printing expenses, (iv) 
internal expenses (including without limitation, all salaries and expenses of 
its officers and employees performing legal or accounting duties), (v) the 
fees and expenses incurred in connection with the listing of the Registrable 
Securities on any national securities exchange or interdealer quotation 
system, (vi) the reasonable fees and disbursements of counsel for the Company 
and customary fees and expenses for independent certified public accountants 
retained by the Company (including the expenses of any comfort letters or 
costs associated with the delivery by independent certified public 
accountants of a comfort letter or comfort letters), (vii) the reasonable 
fees and disbursements of not more than one firm of attorneys acting as legal 
counsel for (x) all of the selling shareholders, collectively, in respect of 
a registration pursuant to Section 4 hereof or (y) all of the participating 
Holders, collectively, in respect of a registration pursuant to Section 5 
hereof, (viii) the fees and expenses of any registrar and transfer agent for 
the Common Shares, (ix) the underwriting fees, discounts and commissions 
applicable to any Common Shares sold for the account of the Company and (x) 
all expenses of any Person in preparing or assisting in preparing, word 
processing, printing and distributing any registration statement, prospectus, 
certificates and other documents relating to the performance of and 
compliance with this Agreement.  Except as otherwise provided in clause (ix) 

<PAGE>

                                          15

of this Section 8, the Company shall have no obligation to pay any 
underwriting fees, discounts or commissions attributable to the sale of 
Registrable Securities.

          Section 9.     Indemnification; Contribution.

          (a)  The Company agrees to indemnify and hold harmless each 
Indemnitee from and against any and all losses, claims, damages, liabilities 
and expenses (including reasonable costs of investigation) arising out of or 
based upon any untrue statement or alleged untrue statement of a material 
fact contained in any prepricing prospectus, registration statement or 
prospectus or in any amendment or supplement thereto, or arising out of or 
based upon any omission or alleged omission to state therein a material fact 
required to be stated therein or necessary to make the statements therein not 
misleading, except insofar as such losses, claims, damages, liabilities or 
expenses arise out of or are based upon any untrue statement or omission or 
alleged untrue statement or omission which has been made therein or omitted 
therefrom in reliance upon and in conformity with the information relating to 
a participating Holder furnished in writing to the Company by or on behalf of 
a participating Holder expressly for use in connection therewith.  The 
foregoing indemnity agreement shall be in addition to any liability which the 
Company may otherwise have.

          (b)  If any action, suit or proceeding shall be brought against an 
Indemnitee in respect of which indemnity may be sought against the Company, 
such Indemnitee shall promptly notify the Company, and the Company shall 
assume the defense thereof, including the employment of counsel and payment 
of all fees and expenses.  The Indemnitee shall have the right to employ 
separate counsel in any such action, suit or proceeding and to participate in 
the defense thereof, but the fees and expenses of such counsel shall be at 
the expense of such Indemnitee unless (x) the Company has agreed in writing 
to pay such fees and expenses, (y) the Company has failed to assume the 
defense and employ counsel, or (z) the named parties to any such action, suit 
or proceeding (including any impleaded parties) include both such Indemnitee 
and the Company, and such Indemnitee shall have been advised by its counsel 
that representation of such Indemnitee and the Company by the same counsel 
would be inappropriate under applicable standards of professional conduct 
(whether or not such representation by the same counsel has been proposed) 
due to actual or potential differing interests between them (in which case 
the Company shall not have the right to assume the defense of such action, 
suit or proceeding on behalf of such Indemnitee).  It is understood, however, 
that the Company shall, in connection with any one such action, suit or 
proceeding or separate but substantially similar or related actions, suits or 
proceedings in the same jurisdiction arising out of the same general 
allegations or circumstances, be liable for the reasonable fees and expenses 
of only one separate firm of attorneys (in addition to any local counsel) at 
any time for all such Indemnitees not having actual or potential differing 
interests among themselves, and that all such fees and expenses shall be 
reimbursed as they are incurred.  The Company shall not be liable for any 
settlement of any such action, suit or proceeding effected without its 
written consent, but if settled with such written consent, or if there be a 
final judgment for the plaintiff in any such action, suit or proceeding, the 
Company agrees to indemnify and hold harmless such Indemnitee, to the extent 
provided in the preceding paragraph, from and against any loss, claim, 
damage, liability or expense by reason of such settlement or judgment.

          (c)  Each of the participating Holders, severally and not jointly, 
agree to indemnify and hold harmless the Company, its directors, its officers 
who sign the registration statement, and any person who controls the Company 
within the meaning of Section 15 of the Securities Act or Section 20 of the 
Exchange Act, to the same extent as the foregoing indemnity from the Company 
to an Indemnitee, but only with respect to information relating to such 
Holder furnished in writing by or on behalf of such Holder expressly for use 
in the registration statement, prospectus or any prepricing prospectus, or 
any 



<PAGE>

                                          16

amendment or supplement thereto.  If any action, suit or proceeding shall be 
brought against the Company, any of its directors, any such officer, or any 
such controlling person based on the registration statement, prospectus or 
any prepricing prospectus, or any amendment or supplement thereto, and in 
respect of which indemnity may be sought against any Holder pursuant to this 
Section 9(c), such Holder shall have the rights and duties given to the 
Company by Section 9(b) hereof (except that if the Company shall have assumed 
the defense thereof such Holder shall not be required to do so, but may 
employ separate counsel therein and participate in the defense thereof, but 
the fees and expenses of such counsel shall be at the Holder's expense), and 
the Company, its directors, any such officer, and any such controlling person 
shall have the rights and duties given to an Indemnitee by Section 9(b) 
hereof.  The foregoing indemnity agreement shall be in addition to any 
liability which the participating Holders may otherwise have.

          (d)  If the indemnification provided for in this Section 9 is 
unavailable to an indemnified party under paragraphs (a) or (c) hereof in 
respect of any losses, claims, damages, liabilities or expenses referred to 
therein. then an indemnifying party, in lieu of indemnifying such indemnified 
party, shall contribute to the amount paid or payable by such indemnified 
party as a result of such losses, claims, damages, liabilities or expenses in 
such proportion as is appropriate to reflect the relative fault of the 
Company and of the participating Holders in connection with the statements or 
omissions that resulted in such losses, claims, damages, liabilities or 
expenses.  The relative fault of the Company on the one hand and a 
participating Holder on the other hand shall be determined by reference to, 
among other things, whether the untrue or alleged untrue statement of a 
material fact or the omission or alleged omission to state a material fact 
relates to information supplied by the Company on the one hand or by such 
participating Holder on the other hand and the parties' relative intent, 
knowledge, access or information and opportunity to correct or prevent such 
statement or omission.

          (e)  The Company and the participating Holders agree that it would 
not be just and equitable if contribution pursuant to this Section 9 were 
determined by a pro rata allocation or by any other method of allocation that 
does not take account of the equitable considerations referred to in Section 
9(d) hereof.  The amount paid or payable by an indemnified party as a result 
of the losses, claims, damages, liabilities and expenses referred to in 
Section 9(d) hereof shall be deemed to include, subject to the limitations 
set forth above, any legal or other expenses reasonably incurred by such 
indemnified party in connection with investigating any claim or defending any 
such action, suit or proceeding.  Notwithstanding the provisions of this 
Section 9, no participating Holder shall be required to contribute any amount 
in excess of the amount by which the proceeds to such participating Holder 
exceeds the amount of any damages which such participating Holder has 
otherwise been required to pay by reason of such untrue or alleged untrue 
statement or omission or alleged omission.  No person guilty of fraudulent 
misrepresentation (within the meaning of Section 11(f) of the Securities Act) 
shall be entitled to contribution from any person who was not guilty of such 
fraudulent misrepresentation.

          (f)  No indemnifying party shall, without the prior written consent 
of the indemnified party, effect any settlement of any pending or threatened 
action, suit or proceeding in respect of which any indemnified party is or 
could have been a party and indemnity could have been sought hereunder by 
such indemnified party, unless such settlement includes an unconditional 
release of such indemnified party from all liability on claims that are the 
subject matter of such action, suit or proceeding.

          (g)  Any losses, claims, damages, liabilities or expenses for which 
an indemnified party is entitled to indemnification or contribution under 
this Section 9 shall be paid by the indemnifying party to the indemnified 
party as such losses, claims, damages, liabilities or expenses are incurred.  
The indemnity and contribution agreements contained in this Section 9 shall 
remain operative and in full force and effect, regardless of (i) any 
investigation made by or on behalf of an Indemnitee, the Company, its 
directors or officers, or any person controlling the Company, and (ii) any 
termination of this Agreement.

          Section 10.    Participation in Underwritten Registrations.  An 
Original Holder may not participate in any underwritten offering pursuant to 
Section 4 or 5 hereof unless such Holder (i) agrees to sell its 

<PAGE>

                                          17

Registrable Securities on the basis provided in any underwriting arrangements 
which, to the extent applicable solely to the participating Original Holders, 
are approved by the participating Original Holders in their reasonable 
discretion or which, to the extent applicable to the Company and the 
participating Original Holders, are approved by the Company in its reasonable 
discretion and (ii) completes and executes all questionnaires, powers of 
attorney, indemnities, underwriting agreements and other documents (including 
lock-up agreements) reasonably required under the terms of such underwriting 
arrangements which are not inconsistent with the terms of this Agreement.

          Section 11.    Other Registration Rights.  The Company agrees that 
it shall not enter into any agreement which provides registration rights to 
any Person that are inconsistent with the provisions contained in this 
Agreement.  If the Company does become a party to such an agreement, the 
Company agrees that to the extent that the provisions of such agreement 
conflict with this Agreement, the provisions of this Agreement shall control.

          Section 12.    Rule 144 Sales.

          (a)  The Company covenants that it will file the reports required 
to be filed by the Company under the Securities Act and the Exchange Act, so 
as to enable any Holder to sell Registrable Securities pursuant to Rule 144 
under the Securities Act.

          (b)  In connection with any sale, transfer or other disposition by 
any Holder of any Registrable Securities pursuant to Rule 144 under the 
Securities Act, the Company shall cooperate with such Holder to facilitate 
the timely preparation and delivery of certificates representing Registrable 
Securities to be sold and not bearing any Securities Act legend, and enable 
certificates for such Registrable Securities to be for such number of shares 
and registered in such names as the selling Holders may reasonably request at 
least two business days prior to any sale of Registrable Securities. 

          Section 13.    Miscellaneous.

          (a)  Amendments and Waivers.  The provisions of this Agreement, 
including the provisions of this sentence, may not be amended, modified or 
supplemented, and waivers or consents to departures from the provisions 
hereof may not be given without the written consent of the Company and 
Holders constituting Majority Holders; provided, however, that no amendment, 
modification or supplement or waiver or consent to the departure with respect 
to the provisions of Sections 1 through 12, inclusive, hereof or which would 
impair the rights of any Holder under such provisions, shall be effective as 
against any Holder of Registrable Securities, Preferred Units or Partnership 
Units unless consented to in writing by such Holder of Registrable 
Securities, Preferred Units or Partnership Units.  Notice of any amendment, 
modification or supplement to this Agreement adopted in accordance with this 
Section 13(a) shall be provided by Company to each Holder of Registrable 
Securities, Preferred Units or Partnership Units at least thirty (30) days 
prior to the effective date of such amendment, modification or supplement.

          (b)  Notices.  All notices and other communications provided for or 
permitted hereunder shall be made in writing by hand delivery, registered 
first-class mail, telex, telecopier or any courier guaranteeing overnight 
delivery, (i) if to a Holder, at the most current address given by such 
Holder to the Company by means of a notice given in accordance with the 
provisions of this Section 13(b), which address initially is, with respect to 
each Holder, the address set forth in the Partnership Agreement, or (ii) if 
to the Company, at One Logan Square, Suite 1105, Philadelphia, Pennsylvania.

<PAGE>

                                          18

          All such notices and communications shall be deemed to have been 
duly given: at the time delivered by hand, if personally delivered; five 
business days after being deposited in the mail, postage prepaid, if mailed; 
when answered back, if telexed; when receipt is acknowledged, if telecopied; 
or at the time delivered if delivered by an air courier guaranteeing 
overnight delivery.

          (c)  Successors and Assigns.  This Agreement shall inure to the 
benefit of and be binding upon the successors, assigns and transferees of 
each of the Company and the Holders, including without limitation and without 
the need for an express assignment, subsequent Holders.  If any successor, 
assignee or transferee of any Holder shall acquire Registrable Securities, in 
any manner, whether by operation of law or otherwise, such Registrable 
Securities shall be held subject to all of the terms of this Agreement, and 
by taking and holding such Registrable Securities such Person shall be 
entitled to receive the benefits hereof and shall be conclusively deemed to 
have agreed to be bound by all of the terms and provisions hereof.

          (d)  Headings.  The headings in this Agreement are for the 
convenience of reference only and shall not limit or otherwise affect the 
meaning hereof.

          (e)  GOVERNING LAW.  THIS AGREEMENT SHALL BE GOVERNED BY AND 
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF DELAWARE WITHOUT GIVING 
EFFECT TO THE CONFLICTS OF LAW PROVISIONS THEREOF.

          (f)  Specific Performance.  The Company and the Holders acknowledge 
that there would be no adequate remedy at law if any party fails to perform 
any of its obligations hereunder, and accordingly agree that the Company and 
each Holder, in addition to any other remedy to which it may be entitled at 
law or in equity, shall be entitled to compel specific performance of the 
obligations of another under this Agreement in accordance with the terms and 
conditions of this Agreement in any court of the United States or any State 
thereof having jurisdiction.

          (g)  Entire Agreement.  This Agreement is intended by the Company 
as a final expression of its agreement and is intended to be a complete and 
exclusive statement of the agreement and understanding of the Company in 
respect of the subject matter contained herein.  This Agreement supersedes 
all prior agreements and understandings of the Company with respect to such 
subject matter.

          IN WITNESS WHEREOF, the Company has executed this Agreement as of 
the date first written above.

                              CORPORATE OFFICE PROPERTIES TRUST

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


<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-END>                               JUN-30-1998
<CASH>                                           4,914
<SECURITIES>                                         0
<RECEIVABLES>                                      315
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                 3,624
<PP&E>                                         294,151
<DEPRECIATION>                                 (5,479)
<TOTAL-ASSETS>                                 297,525
<CURRENT-LIABILITIES>                            5,580
<BONDS>                                        144,417
                                0
                                          0
<COMMON>                                             0
<OTHER-SE>                                     147,528
<TOTAL-LIABILITY-AND-EQUITY>                   297,525
<SALES>                                              0
<TOTAL-REVENUES>                                13,367
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                 8,362<F1>
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               4,575
<INCOME-PRETAX>                                      0
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                       430
<EPS-PRIMARY>                                     0.09
<EPS-DILUTED>                                     0.09
<FN>
<F1>Reflects nonrecurring Reformation costs of $637 associated with the Reformation
of the Company as a Maryland Trust.
</FN>
        

</TABLE>


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