CORPORATE OFFICE PROPERTIES TRUST
10-Q, 1999-05-14
REAL ESTATE INVESTMENT TRUSTS
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<PAGE>


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

                                  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            MARCH 31, 1999                      
                               -----------------------------------------------
                                       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.)

401 CITY AVENUE, SUITE 615, BALA CYNWYD, PA                19004
  (Address of principal executive offices)               (Zip Code)

       Registrant's telephone number, including area code: (610) 538-1800

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



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 May 14, 1999, 16,801,876 shares of the Company's Common Shares of Beneficial
Interest, $0.01 par value, were outstanding.

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



<PAGE>


                                TABLE OF CONTENTS


                                    FORM 10-Q

<TABLE>
<CAPTION>

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

Item 1:    Financial Statements: 
           Consolidated Balance Sheets as of March 31, 1999 
             (unaudited) and December 31, 1998                         3
           Consolidated Statements of Operations for the three 
             months ended March 31, 1999 and 1998 (unaudited)          4
           Consolidated Statements of Cash Flows for the three 
             months ended March 31, 1999 and 1998 (unaudited)          5
           Notes to Consolidated Financial Statements                  6
Item 2:    Management's Discussion and Analysis of Financial 
             Condition and Results of Operations                      16
Item 3:    Quantitative and Qualitative Disclosures About 
             Market Risk                                              23



PART II:  OTHER INFORMATION


Item 1:     Legal Proceedings                                         23
Item 2:     Changes in Securities                                     24
Item 3:     Defaults Upon Senior Securities                           24
Item 4:     Submission of Matters to a Vote of Security Holders       24
Item 5:     Other Information                                         24
Item 6:     Exhibits and Reports on Form 8-K                          24


SIGNATURES                                                            31

</TABLE>





                                       2
<PAGE>


PART I.  FINANCIAL INFORMATION
ITEM 1.  FINANCIAL STATEMENTS

                        CORPORATE OFFICE PROPERTIES TRUST
                           CONSOLIDATED BALANCE SHEETS

                             (DOLLARS IN THOUSANDS)

<TABLE>
<CAPTION>

                                                                                   March 31,          December 31,
                                                                                     1999                1998
                                                                                   ---------          ------------
                                                                                  (unaudited)
<S>                                                                                <C>                 <C>      
ASSETS
Commercial real estate properties:
   Operating properties, net                                                       $ 511,851           $ 536,228
   Projects under construction                                                        16,178              10,659
- ------------------------------------------------------------------------------------------------------------------
   Total commercial real estate properties, net                                      528,029             546,887

Cash and cash equivalents                                                              3,615               2,349
Accounts receivable, net                                                               3,486               2,986
Investment in and advances to Service Companies                                        4,701               2,351
Deferred rent receivable                                                               2,824               2,263
Deferred charges, net                                                                  3,914               3,542
Prepaid and other assets                                                               3,634               3,299
- ------------------------------------------------------------------------------------------------------------------
TOTAL ASSETS                                                                       $ 550,203           $ 563,677
- ------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------

LIABILITIES AND SHAREHOLDERS' EQUITY
Liabilities:
   Mortgage loans payable                                                          $ 290,836           $ 306,824
   Accounts payable and accrued expenses                                               3,265               3,395
   Rents received in advance and security deposits                                     3,744               2,789
   Dividends/distributions payable                                                     4,743               4,692
- ------------------------------------------------------------------------------------------------------------------
Total liabilities                                                                    302,588             317,700
- ------------------------------------------------------------------------------------------------------------------
Minority interests:
   Preferred Units                                                                    52,500              52,500
   Common Units                                                                       26,422              24,696
- ------------------------------------------------------------------------------------------------------------------
Total minority interests                                                              78,922              77,196
- ------------------------------------------------------------------------------------------------------------------

Commitments and contingencies (Note 13)

Shareholders' equity:
   Preferred Shares ($0.01 par value; 5,000,000 authorized); 1,025,000
      designated as Series A Convertible Preferred Shares of beneficial interest
      ($0.01 par value, 984,308 shares issued
      and outstanding)                                                                  10                    10
   Common Shares of beneficial interest ($0.01 par value; 45,000,000
      authorized, 16,801,876 shares issued and outstanding)                            168                   168
   Additional paid-in capital                                                      175,532               175,802
   Accumulated deficit                                                              (7,017)               (7,199)
- ------------------------------------------------------------------------------------------------------------------
Total shareholders' equity                                                         168,693               168,781
- ------------------------------------------------------------------------------------------------------------------

TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY                                       $ 550,203             $ 563,677
- ------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------

</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 March 31,
                                                                      ---------------------------------------------
                                                                               1999                  1998
                                                                      ---------------------- ----------------------
<S>                                                                       <C>                     <C>     
REVENUES
   Rental income                                                          $  16,179               $  4,919
   Tenant recoveries and other income                                         2,344                    606
- ------------------------------------------------------------------------------------------------------------------
     Total revenues                                                          18,523                  5,525
- ------------------------------------------------------------------------------------------------------------------

EXPENSES
   Property operating                                                         5,003                    899
   General and administrative                                                   889                    299
   Interest                                                                   5,193                  2,159
   Amortization of deferred financing costs                                     225                     64
   Depreciation and other amortization                                        2,792                    977
   Reformation costs                                                            --                     637
- ------------------------------------------------------------------------------------------------------------------
     Total expenses                                                          14,102                  5,035
- ------------------------------------------------------------------------------------------------------------------

Income before equity in income of Service Companies, gain on sales                                                 
   of rental properties, minority interests and extraordinary item            4,421                    490
Equity in income of Service Companies                                           181                    -- 
- ------------------------------------------------------------------------------------------------------------------
Income before gain on sales of rental properties, minority                                                         
   interests and extraordinary item                                           4,602                    490
Gain on sales of rental properties                                              986                    -- 
- ------------------------------------------------------------------------------------------------------------------
Income before minority interests and extraordinary item                       5,588                    490
Minority interests
   Preferred Units                                                             (853)                  (853)
   Common Units                                                                (496)                  (136)
- ------------------------------------------------------------------------------------------------------------------
Income (loss) before extraordinary item                                       4,239                   (499)
Extraordinary item - loss on early retirement of debt                          (694)                   -- 
- ------------------------------------------------------------------------------------------------------------------
NET INCOME (LOSS)                                                             3,545                   (499)
Preferred Share dividends                                                      (338)                    -- 
- ------------------------------------------------------------------------------------------------------------------
NET INCOME (LOSS) AVAILABLE TO COMMON SHAREHOLDERS                        $   3,207               $   (499)
- ------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------
BASIC EARNINGS (LOSS) PER COMMON SHARE
   Income before extraordinary item                                       $    0.23               $   (0.22)
   Extraordinary item                                                         (0.04)                 --    
- ------------------------------------------------------------------------------------------------------------------
   Net income                                                             $    0.19               $   (0.22)
- ------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------
DILUTED EARNINGS (LOSS) PER COMMON SHARE
   Income before extraordinary item                                       $    0.19               $   (0.22)
   Extraordinary item                                                         (0.02)                 --    
- ------------------------------------------------------------------------------------------------------------------
   Net income                                                             $    0.17              $    (0.22)
- ------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------

</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 three months ended March 31,
                                                                      ------------------------------------
                                                                            1999                1998
                                                                      ---------------       --------------

<S>                                                                      <C>                 <C>     
CASH FLOWS FROM OPERATING ACTIVITIES
   Net income (loss)                                                     $  3,545            $  (499)
   Adjustments to reconcile net income (loss) to net cash
     provided by operating activities:
     Minority interests                                                     1,349                989
     Depreciation and amortization                                          2,792                977
     Amortization of deferred financing costs                                 225                 64
     Equity in income of Service Companies                                   (181)               --
     Gain on sales of properties                                             (986)               -- 
     Increase in deferred rent receivable                                    (675)              (358)
     Increase in accounts receivable and prepaid and other
     assets                                                                  (335)              (172)
     Increase (decrease) in accounts payable, accrued expenses,
     rents received in advance and security deposits                          736                (45)
- --------------------------------------------------------------------------------------------------------
         Net cash provided by operating activities                          6,470                956
- --------------------------------------------------------------------------------------------------------
CASH FLOWS FROM INVESTING ACTIVITIES
   Purchases of and additions to commercial real estate properties        (13,864)               (82)
   Proceeds from sales of operating properties                             16,828                --
   Investments in and advances to Service Companies                        (2,169)               --
   Leasing commissions paid                                                  (373)               --
   Increase in prepaid and other assets                                      (500)              (600)
- --------------------------------------------------------------------------------------------------------
         Net cash used in investing activities                                (78)              (682)
- --------------------------------------------------------------------------------------------------------
CASH FLOWS FROM FINANCING ACTIVITIES
   Proceeds from mortgage loans payable                                    19,075                --      
   Repayments of mortgage loans payable                                   (19,151)               (74)
   Deferred financing costs paid                                             (358)               --      
   Net proceeds from issuance of Common Shares                               --                   27
   Dividends/distributions paid                                            (4,692)            (1,276)
- --------------------------------------------------------------------------------------------------------
         Net cash used in financing activities                             (5,126)            (1,323)
- --------------------------------------------------------------------------------------------------------
Net increase (decrease) in cash and cash equivalents                        1,266             (1,049)

CASH AND CASH EQUIVALENTS
   Beginning of period                                                      2,349              3,395
- --------------------------------------------------------------------------------------------------------
   End of period                                                         $  3,615            $ 2,346
- --------------------------------------------------------------------------------------------------------
- --------------------------------------------------------------------------------------------------------

</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)

NOTE 1   ORGANIZATION

     Corporate Office Properties Trust ("COPT") and subsidiaries (the "Company")
is a full-service real estate investment trust ("REIT"). We focus principally on
the ownership, development, management and acquisition of suburban office
buildings in targeted suburban submarkets in the Mid-Atlantic region of the
United States. COPT is qualified as a REIT as defined in the Internal Revenue
Code and is the successor to a corporation organized in 1988. As of March 31,
1999, our portfolio included 54 commercial real estate properties leased for
office and retail purposes.

     We conduct almost all of our operations through our operating partnership,
Corporate Office Properties, L.P. (the "Operating Partnership"), for which we
are the managing general partner. The Operating Partnership owns real estate
both directly and through subsidiary partnerships and limited liability
companies ("LLCs"). The Operating Partnership also owns the principal economic
interest and, collectively with our Chief Executive Officer and Chief Operating
Officer, 49.5% of the voting stock of Corporate Office Management, Inc. ("COMI")
(together with its subsidiaries defined as the "Service Companies"). A summary
of our Operating Partnership's forms of ownership and the percentage of those
ownership forms owned by COPT follows:


<TABLE>
<CAPTION>
                                                          % Owned by 
                                                             COPT
                                                          ---------- 
     <S>                                                    <C> 
     Common Units (see Note 3)                                 84%
     Series A Preferred Units                                 100%
     Initial Preferred Units (see Note 3)                       0%

</TABLE>

      Throughout these consolidated financial statements, we use the term
"Preferred Units" to define the combination of both Series A Preferred Units and
Initial Preferred Units of our Operating Partnership. All Preferred Units are
convertible into Common Units in the Operating Partnership.

NOTE 2   BASIS OF PRESENTATION

      These notes to our interim financial statements highlight significant
changes to the notes to the financial statements included in our 1998 Form 10-K.
As a result, these notes to our interim financial statements should be read
together with the financial statements and notes thereto included in our 1998
Form 10-K. The interim financial statements on the previous pages reflect all
adjustments which we believe are necessary for the fair presentation of our
financial position and results of operations for the interim periods presented.
These adjustments are of a normal recurring nature. The results of operations
for such interim periods are not necessarily indicative of the results for a
full year.

     We use two different accounting methods to report our investments in
entities: the consolidation method and the equity method.

CONSOLIDATION METHOD

     We use the consolidation method when we own most of the outstanding voting
interests in an entity and can control its operations. This means the accounts
of the entity are combined with our accounts. We eliminate 



                                       6
<PAGE>

balances and transactions between companies when we consolidate these accounts.
Our consolidated financial statements include the accounts of:

- -    COPT,
- -    the Operating Partnership and its subsidiary partnerships and LLCs, and
- -    Corporate Office Properties Holdings, Inc. (we own 100%).

EQUITY METHOD

     We use the equity method of accounting to report our investment in the
Service Companies. Under the equity method, we report:

- -    our ownership interest in the Service Companies' capital as an investment 
     on our Consolidated Balance Sheets and
- -    our percentage share of the earnings or losses from the Service Companies
     in our Consolidated Statements of Operations.

NOTE 3   SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

USE OF ESTIMATES IN THE PREPARATION OF FINANCIAL STATEMENTS

     We make estimates and assumptions when preparing financial statements under
generally accepted accounting principles. These estimates and assumptions affect
various matters, including:

- -    our reported amounts of assets and liabilities in our Consolidated Balance
     Sheets at the dates of the financial statements,
- -    our disclosure of contingent assets and liabilities at the dates of the
     financial statements, and
- -    our reported amounts of revenues and expenses in our Consolidated
     Statements of Operations during the reporting periods.

     These estimates involve judgements with respect to, among other things,
future economic factors that are difficult to predict and are often beyond
management's control. As a result, actual amounts could differ from these
estimates.

MINORITY INTERESTS

     As discussed previously, we consolidate the accounts of our Operating
Partnership into our financial statements. However, we do not own 100% of the
Operating Partnership. The amounts reported for minority interests on our
Consolidated Balance Sheets represent the portion of the Operating Partnership's
equity that we do not own. The amounts reported for minority interests on our
Consolidated Statements of Operations represent the portion of the Operating
Partnership's net income not allocated to us.

     Common Units of the Operating Partnership are substantially similar
economically to our Common Shares of beneficial interest ("Common Shares"). The
Common Units are also exchangeable into our Common Shares, subject to certain
conditions. We have accrued distributions related to Common Units owned by
minority interests of $527 at March 31, 1999 and $488 at December 31, 1998.

     The owners of our Operating Partnership's Initial Preferred Units are
entitled to a 6.5% priority annual return. Income of our Operating Partnership
is also allocated to holders of Initial Preferred Units using the 6.5% priority
annual return. These units are convertible by unitholders at their option on or
after October 1, 1999, into Common Units on the basis of 3.5714 Common Units for
each Initial Preferred Unit, plus any accrued return. We have accrued
distributions related to Initial Preferred Units owned by minority interests of
$853 at March 31, 1999 and December 31, 1998.


                                       7
<PAGE>


EARNINGS PER SHARE ("EPS")

     We present both basic and diluted EPS. We compute basic EPS by dividing
income available to common shareholders by the weighted-average number of Common
Shares outstanding during the period. Our computation of diluted EPS is similar
except that:

- -    the denominator is increased to include the weighted average number of
     potential additional Common Shares that would have been outstanding if
     securities that are convertible now or in the future into our Common Shares
     were converted and

- -    the numerator is adjusted to add back any convertible preferred dividends
     and any other changes in income or loss that would result from the assumed
     conversion into Common Shares.

Our computation of diluted EPS does not assume conversion of securities into our
Common Shares if conversion of those securities would increase our diluted EPS
in a given period. A summary of the numerator and denominator for purposes of
our basic and diluted EPS calculations for income (loss) before extraordinary
item is as follows (dollars and shares in thousands):

<TABLE>
<CAPTION>

                                                                THREE MONTHS ENDED MARCH 31,
                                                                ----------------------------
                                                                     1999          1998
                                                                -------------   ------------
<S>                                                                 <C>          <C>   

Numerator:
Net income (loss) available to Common Shareholders                  $ 3,207       $(499)
Extraordinary loss                                                      694        --
                                                                     ------      ------
Numerator for basic earnings per share before extraordinary item      3,901        (499)
Minority interests - Preferred Shares                                   338        --   
Minority interests - Preferred Units                                    853        --   
Minority interests -  Common Units                                      496        --   
                                                                    -------      -------
Numerator for diluted earnings per share before                    
  extraordinary item                                                $ 5,588       $(499)
                                                                    -------      -------
                                                                    -------      -------
Denominator:
Weighted average Common Shares - basic                               16,802       2,268
Assumed conversion of share options                                       8          26
Conversion of Preferred Shares                                        1,845        --
Conversion of Initial Preferred Units                                 7,500        --
Conversion of Common Units                                            2,759        --
                                                                     ------      ------
Weighted average Common Shares - diluted                             28,914       2,294
                                                                    -------      -------
                                                                    -------      -------

</TABLE>


     Our diluted EPS computation for income before extraordinary item for the
three months ended March 31, 1999 as reported above assumes conversion of
Preferred Shares, Initial Preferred Units and Common Units since such
conversions would decrease diluted EPS in that period. Our diluted EPS
computation for net income for the three months ended March 31, 1999 only
assumes conversion of Initial Preferred Units because conversions of Preferred
Shares and Common Units would increase diluted EPS in that period. Our diluted
EPS computation for the three months ended March 31, 1998 does not assume
conversion of Initial Preferred Units or Common Units since these conversions
would increase diluted EPS in that period.



                                       8
<PAGE>


NOTE 4   COMMERCIAL REAL ESTATE PROPERTIES

     Operating properties consisted of the following:

<TABLE>
<CAPTION>

                                     March 31,  December 31,
                                       1999        1998
                                    ---------   ------------
<S>                                 <C>          <C>        

Land                                $ 103,255    $ 108,433
Buildings and improvements            418,472      436,932
Furniture, fixtures and equipment         332          332
                                    ---------    ---------
                                      522,059      545,697
Less: accumulated depreciation        (10,208)      (9,469)
                                    ---------    ---------
                                    $ 511,851    $ 536,228
                                    ---------    ---------
                                    ---------    ---------

</TABLE>

     Projects we had under development consisted of the following:

<TABLE>
<CAPTION>

                                    March 31,   December 31,
                                       1999        1998
                                    ---------   ------------
<S>                                 <C>          <C>        

Land                                $  8,962     $    8,941
Construction in progress               7,216          1,718
                                    ---------    ----------
                                    $ 16,178     $   10,659
                                    ---------    ----------
                                    ---------    ----------

</TABLE>



1999 ACQUISITIONS

     On February 23, 1999, we acquired an office building located in Linthicum,
Maryland (the "Airport XXI Property"). We acquired the property for $6,751,
including transaction costs, using $6,650 in borrowings under our recourse
revolving credit facility with Bankers Trust Company (the "Revolving Credit
Facility") and cash reserves for the balance.

1999 CONSTRUCTION IN PROGRESS

     At March 31, 1999, we had construction underway on two new buildings. We
also had a project underway that will expand the rentable square footage of one
of our properties.

1999 DISPOSITIONS

     On January 22, 1999, we sold a retail property located in Westminster,
Maryland. We sold the property for $18,900, of which $9,513 was used to pay off
the mortgage loan payable on the property. We realized no gain on this sale and
net proceeds totaled $9,068.

     We sold three of our retail properties located in the Midwest region of the
United States. On February 26, 1999, we sold a property located in Delafield,
Wisconsin for $3,303, of which $1,802 was used to pay off the mortgage loan
payable on the property. On March 9, 1999, we sold properties located in
Indianapolis, Indiana and Plymouth, Minnesota for $11,200, of which $4,597 was
used to pay off mortgage loans payable on the properties. We realized a gain of
$986 on the sale of the three Midwest region retail properties, including the
value of the transaction involving Glacier Realty LLC (see Note 10). Net
proceeds from these sales totaled $7,760.


                                       9
<PAGE>


NOTE 5   ACCOUNTS RECEIVABLE

     Our accounts receivable are reported net of an allowance for bad debts of
$34 at March 31, 1999 and $50 at December 31, 1998.

NOTE 6   INVESTMENT IN AND ADVANCES TO SERVICE COMPANIES

     We account for our investment in COMI and its subsidiaries, Corporate
Realty Management, LLC ("CRM") and Corporate Development Services, LLC ("CDS"),
using the equity method of accounting. Our investment in and advances to these
Service Companies included the following:

<TABLE>
<CAPTION>

                                         March 31,    December 31,
                                           1999           1998
                                         ---------    ------------
<S>                                      <C>            <C>    
Notes receivable                         $ 3,205        $ 3,205
Equity investment in Service Companies       790            609
Advances receivable (payable)                706         (1,463)
                                         -------        -------
   Total                                 $ 4,701        $ 2,351
                                         -------        -------
                                         -------        -------

</TABLE>


NOTE 7   DEFERRED CHARGES

     Deferred charges consisted of the following:

<TABLE>
<CAPTION>

                                       March 31,    December 31,
                                         1999          1998
                                       ---------    ------------

<S>                                      <C>          <C>    
Deferred financing costs                 $ 2,942      $ 2,611
Deferred leasing costs                     1,756        1,468
Deferred other                                24           24
                                         -------      -------
                                           4,722        4,103
Accumulated amortization                    (808)        (561)
                                         -------      --------
  Deferred charges, net                  $ 3,914      $ 3,542
                                         -------      -------
                                         -------      -------

</TABLE>

NOTE 8   MORTGAGE LOANS PAYABLE

     On January 5, 1999, we entered into an interest rate swap agreement with
Bankers Trust Company. This swap agreement fixes our one-month LIBOR base at
5.085% per annum on a notional amount of $30,000 through May 2001.


     On January 13, 1999, we entered into a $9,825 construction loan with FMB
Bank to finance the construction of a building at our 134 National Business
Parkway property. This loan has an interest rate of LIBOR plus 1.6%. This loan
matures on February 1, 2001 and may be extended for a one-year period, subject
to certain conditions. Borrowings under this loan totaled $4,866 at March 31,
1999.

     On February 8, 1999, we entered into a $10,875 construction loan with
Provident Bank of Maryland to finance the construction of a building at our
Woodlands II property. This loan has an interest rate of LIBOR plus 1.75%. This
loan matures on February 8, 2001 and may be extended for a one-year period,
subject to certain conditions. Borrowings under this loan totaled $2,736 at
March 31, 1999.


                                       10
<PAGE>


NOTE 9   DIVIDENDS AND DISTRIBUTIONS

     On February 24, 1999, we declared the following dividends and distributions
that were paid on April 15, 1999:

<TABLE>
<CAPTION>
                                                                                   Common                 
                                                                     Preferred   Units held               
                                                                     Units held      by                   
                                           Preferred      Common    by Minority   Minority                
                                             Shares       Shares     Interests    Interests      Total
                                             ------       ------     ---------    ---------     -------
 
<S>                                         <C>           <C>          <C>          <C>          <C>   
Total dividends/distributions               $    338      $3,025       $    853     $ 527        $4,743
Dividend/distribution per share/unit        $0.34375      $ 0.18       $0.40625     $0.18          N/A

</TABLE>

NOTE 10  RELATED PARTY TRANSACTIONS

MANAGEMENT

     We have a contract with COMI under which COMI provides asset management,
managerial, financial and legal support. Under the terms of this contract, we
reimburse COMI for personnel and other overhead-related expenses. During the
three months ended March 31, 1999, we incurred management fees and related costs
of $774 under this contract.

     We have a management agreement with CRM under which CRM provides property
management services to most of our properties. Under the terms of this
arrangement, CRM is entitled to a fee equal to 3% of revenue from tenant
billings. CRM is also entitled to reimbursement for direct labor and
out-of-pocket costs. We incurred property management fees and related costs of
$843 with CRM during the three months ended March 31, 1999.

     We had a management agreement with Glacier Realty LLC ("Glacier"), a
company partially owned by one of our Trustees. Under the management agreement,
Glacier was responsible for the management of our retail properties for a base
annual fee of $250 plus a percentage of Average Invested Assets (as defined in
the management agreement). Glacier was also entitled to fees upon our
acquisition or sale of any net-leased retail real estate property, a fee that
increased in the event that all or substantially all of the net-leased retail
real estate properties were sold. The management agreement, entered into on
October 14, 1997, had a term of five years. A fee was also due in the event that
the management agreement was terminated, including for non-renewal. We incurred
fees under this agreement of $63 in each of the three month periods ended March
31, 1999 and March 31, 1998. On March 19, 1999, our Operating Partnership issued
200,000 Common Units valued at $1,487 ($7.4375 per unit) in exchange for all of
the ownership interests in Glacier. For accounting purposes, we recorded the
value of this transaction against the gain on the sale of our retail properties
in the Midwest region of the United States.

     We also have a management agreement with a company for which one of our
Trustees serves on the Board of Directors. We incurred management fees and
related costs under this contract of $27 for the three months ended March
31,1999 and $20 for the three months ended March 31, 1998.

CONSTRUCTION COSTS

     We have entered into a contract with CDS under which CDS provides
construction and development services. Under the terms of this contract, we
reimburse CDS for these services based on actual time incurred at market rates.
During the three months ended March 31, 1999, we incurred $262 under this
contract, a substantial portion of which was capitalized into the cost of the
related activities.



                                       11
<PAGE>



RENTAL INCOME

     During the three months ended March 31, 1999, we recognized revenue of $99
on office space leased to COMI and CRM. During the three months ended March 31,
1999, we recognized revenue of $227 on office space leased to Constellation Real
Estate, Inc. ("Constellation"), which owns 42% of our Common Shares and 100% of
our Preferred Shares, and its affiliate, Baltimore Gas and Electric Company
("BGE").

INTEREST INCOME

     During the three months ended March 31, 1999, we earned interest income of
$72 on notes receivable from the Service Companies.

CONSTRUCTION FEES

     During the three months ended March 31, 1999, the Service Companies earned
construction management fees of $42 from an entity owned by an officer and
Trustee of ours.

LEASING COMMISSION

     During the three months ended March 31, 1999, the Service Companies earned
a leasing commission of $56 from an entity owned by an officer and Trustee of
ours.

FEES EARNED FROM CONSTELLATION AND BGE

     During the three months ended March 31, 1999, the Service Companies earned
$450 from a project consulting and management agreement with Constellation. The
Service Companies also earned $130 in fees and expense reimbursements during the
three months ended March 31, 1999 under a property management agreement with
BGE.

UTILITIES EXPENSE

     During the three months ended March 31, 1999, BGE provided utility services
to most of our properties in the Baltimore/Washington Corridor.




                                       12
<PAGE>

NOTE 11  SUPPLEMENTAL INFORMATION TO STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>

                                                                    For the Three Months Ended March 31,
                                                                    ------------------------------------
                                                                           1999             1998
                                                                    ----------------   -----------------
<S>                                                                       <C>             <C>      

Supplemental schedule of non-cash investing and 
  financing activities:

Debt repaid in connection with sales of properties                        $ 15,912        $   --   
                                                                          --------        --------
                                                                          --------        --------
Adjustments to minority interests resulting from changes
   in ownership of Operating Partnership by COPT                          $   (270)       $   --   
                                                                          --------        --------
                                                                          --------        --------
Increase in accrued capital improvements                                  $     89        $   --   
                                                                          --------        --------
                                                                          --------        --------
Dividends/distributions payable                                           $  4,743        $  4,692
                                                                          --------        --------
                                                                          --------        --------
Increase in minority interests resulting from issuance of
   Common Units in connection with Glacier acquisition                    $  1,487        $   --   
                                                                          --------        --------
                                                                          --------        --------

</TABLE>

NOTE 12  INFORMATION BY BUSINESS SEGMENT

     We have five segments: Baltimore/Washington office, Greater Philadelphia
office, Northern/Central New Jersey office, Greater Harrisburg office and
retail. Our office properties represent our core-business. We manage our retail
properties as a single segment since they are considered outside of our
core-business.

     The table below reports segment financial information. Our Greater
Harrisburg and retail segments are not separately reported since they do not
meet the reporting thresholds. We measure the performance of our segments based
on total revenues less direct property operating expenses. Accordingly, we do
not report other expenses by segment in the table below.



                                       13
<PAGE>

<TABLE>
<CAPTION>

                                                                           Northern/
                                          Baltimore/       Greater        Central New
                                          Washington     Philadelphia       Jersey
                                            Office         Office           Office       Other         Total
                                           -------         ------           ------       ------      -------

<S>                                        <C>            <C>               <C>          <C>       <C>     
Three Months Ended March 31, 1999:
Revenues                                   $ 10,314     $  2,506          $  4,096     $  1,607    $ 18,523
Direct property operating expenses            3,000            6             1,478          400       4,884
                                           --------     --------          --------     --------    --------
Income from operations                     $  7,314     $  2,500          $  2,618     $  1,207    $ 13,639
                                           --------     --------          --------     --------    --------
                                           --------     --------          --------     --------    --------
Commercial real estate property
    expenditures                           $  7,085     $  --             $    780     $  6,088    $ 13,953
                                           --------     --------          --------     --------    --------
Segment assets at March 31, 1999           $279,274     $108,568          $ 97,711     $ 64,650    $550,203
                                           --------     --------          --------     --------    --------
                                           --------     --------          --------     --------    --------
Three Months Ended March 31, 1998:
Revenues                                   $  --        $  2,506          $  1,620     $  1,399    $  5,525
Direct property operating expenses            --               3               584          312         899
                                           --------     --------          --------     --------    --------
Income from operations                     $  --        $  2,503          $  1,036     $  1,087    $  4,626
                                           --------     --------          --------     --------    --------
                                           --------     --------          --------     --------    --------
Commercial real estate property                                                               
    expenditures                           $  --        $  --             $  --        $     82    $     82
                                           --------     --------          --------     --------    --------

Segment assets at March 31, 1998           $  --        $109,830          $ 31,941     $ 50,885    $192,656
                                           --------     --------          --------     --------    --------
                                           --------     --------          --------     --------    --------

</TABLE>


    The following table reconciles our income from operations for reportable
segments to income before equity in income of Service Companies, gain on sales
of rental properties, minority interests and extraordinary item as reported in
our Consolidated Statements of Operations.

<TABLE>
<CAPTION>

                                                                  Three Months Ended March 31,
                                                                  ----------------------------
                                                                     1999             1998
                                                                  -----------     ------------
<S>                                                                <C>                 <C>    
Income from operations for reportable segments                     $ 13,639            $ 4,626
Less:                                                                              
     Indirect property operating expenses                               119                -- 
     General and administrative                                         889                299
     Interest                                                         5,193              2,159
     Amortization of deferred financing costs                           225                 64
     Depreciation and amortization                                    2,792                977
     Reformation costs                                                  --                 637
                                                                      -----              -----
Income before equity in income of Service Companies, gain
   on sales of rental properties, minority interests and
   extraordinary item                                              $  4,421            $   490
                                                                      -----              -----
                                                                      -----              -----

</TABLE>

     We did not allocate indirect property operating expenses, interest expense,
amortization of deferred financing costs and depreciation and other amortization
to segments since they are not included in the measure of segment profit
reviewed by management. We also did not allocate general and administrative,
reformation costs and termination of advisory agreement costs since these items
represent general corporate expenses not attributable to segments.

NOTE 13  COMMITMENTS AND CONTINGENCIES

     In the normal course of business, we are involved in legal actions arising
from our ownership and administration of properties. In management's opinion,
any liabilities that may result are not expected to have a materially adverse
effect on our financial position, operations or liquidity. We are subject to
various federal, state and local environmental regulations related to our
property ownership and operation. We have performed 

                                       14

<PAGE>

environment assessments of our properties, the results of which have not
revealed any environmental liability that we believe would have a materially
adverse effect on our financial position, operations or liquidity.

NOTE 14  PRO FORMA FINANCIAL INFORMATION (UNAUDITED)

     We accounted for our 1999 and 1998 acquisitions using the purchase method
of accounting. We included the results of operations for the acquisitions in our
Consolidated Statements of Operations from their respective purchase dates
through March 31, 1999.

     We prepared our pro forma condensed consolidated financial information
presented below as if all of our 1999 and 1998 acquisitions and dispositions had
occurred on January 1, 1998. Accordingly, we were required to make pro forma
adjustments where deemed necessary. The pro forma financial information is
unaudited and is not necessarily indicative of the results which actually would
have occurred if these acquisitions and dispositions had occurred on January 1,
1998, nor does it intend to represent our results of operations for future
periods.

<TABLE>
<CAPTION>

                                                                    Three Months Ended March 31,
                                                                    ----------------------------
                                                                       1999              1998
                                                                    -------------     ----------

<S>                                                                 <C>                <C>    
Pro forma total revenues                                              $18,412          $15,361
                                                                      -------          -------
                                                                      -------          -------
Pro forma net income available to Common Shareholders                 $ 3,048          $ 1,570
                                                                      -------          -------
                                                                      -------          -------
Pro forma earnings per Common Share
  Basic                                                               $  0.18          $  0.09
                                                                      -------          -------
                                                                      -------          -------
  Diluted                                                             $  0.16          $  0.09
                                                                      -------          -------
                                                                      -------          -------
</TABLE>


NOTE 15  SUBSEQUENT EVENTS


     On April 8, 1999, we obtained a $12,500 mortgage loan payable from FMB
Bank, $9,000 of which is nonrecourse. The loan provides for monthly payments of
interest, at a rate of LIBOR plus 1.75%, and principal of $23 in the loan's
first year, $25 in the second year and $27 in the third year. The loan matures
on May 1, 2002. We pledged three of our operating properties and one parcel of
land as collateral to the lender. We use the term collateralize to describe all
such arrangements.


     On April 16, 1999, we acquired two office buildings located in Hanover,
Maryland (the "Parkway Crossing Properties"). We acquired these properties for
$9,343, including transaction costs, by assuming $4,974 in debt, issuing 326,768
Common Units in our Operating Partnership valued at $3,431 ($10.50 per unit) and
using $938 in borrowings under our Revolving Credit Facility.

     On April 28, 1999, we acquired eight office buildings and a contiguous
parcel of land located in Hanover, Maryland (the "Commons Corporate Portfolio").
We purchased these properties for $25,891, including transaction costs, using
$24,750 in borrowings under our Revolving Credit Facility and cash reserves for
the balance.

     On May 4, 1999, we sold a retail property located in Glendale, Wisconsin
for $1,900, of which $988 was used to pay off the mortgage loan payable on the
property. We realized a gain of $100 on this sale and net proceeds totaled $791.


     On May 5, 1999, we obtained a $10,000 loan from Bankers Trust Company. The
loan bears interest at a rate of LIBOR plus 1.75% and provides for monthly
payments of interest only. The loan matures on November 5, 1999 and is
collateralized by the Commons Corporate Portfolio.



                                       15
<PAGE>

ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
         OF OPERATIONS


OVERVIEW
     Over the last year, we completed a significant number of acquisitions. Our
portfolio consisted of seven retail properties and ten office properties at
March 31, 1998. During the last three quarters of 1998, we acquired 38 office
and two retail properties. We financed these acquisitions using debt and issuing
Common Shares, Preferred Shares and ownership interests in our Operating
Partnership. To accommodate our growth and changing needs as an organization, we
entered into a management arrangement with COMI in September 1998 (see Note 1 to
the financial statements for a description of our interests in COMI). During the
first quarter of 1999, we acquired one office property and sold four of our
retail properties. As of March 31, 1999, our portfolio included 54 commercial
real estate properties leased for office and retail purposes. Due to these
significant changes, our results of operations changed dramatically.

     In this section, we discuss our financial condition and results of
operations for the three months ended March 31, 1999. This section includes
discussions on:

- -    why various components of our Consolidated Statements of Operations changed
     for the three months ended March 31, 1999 compared to the three months
     ended March 31, 1998,
- -    what our primary sources and uses of cash were in the three months ended 
     March 31, 1999, 
- -    how we raised cash for investing and financing activities during the
     three months ended March 31, 1999,
- -    how we intend to generate cash for future capital expenditures, and
- -    the computation of our funds from operations for the three months ended 
     March 31, 1999 and 1998.

     It may be helpful as you read this section to refer to our consolidated
financial statements and accompanying notes and operating data variance analysis
set forth above.

     This section contains "forward-looking" statements, as defined in the
Private Securities Litigation Reform Act of 1995, that are based on our current
expectations, estimates and projections. Statements that are not historical
facts, including statements about our beliefs and expectations, are
forward-looking statements. These statements are not guarantees of future
performance, events or results and involve potential risks and uncertainties.
Accordingly, actual results may differ materially. We undertake no obligation to
update publicly any forward-looking statements, whether as a result of new
information, future events or otherwise.

     Important facts that may affect these expectations, estimates or
projections include, but are not limited to: our ability to borrow on favorable
terms; general economic and business conditions, which will, among other things
affect office property demand and rents, tenant creditworthiness and financing
availability; adverse changes in the real estate markets including, among other
things, competition with other companies; risks of real estate acquisition and
development; governmental actions and initiatives and environmental
requirements.



                                       16
<PAGE>


RESULTS OF OPERATIONS

COMPARISON OF THE THREE MONTHS ENDED MARCH 31, 1999 AND 1998:

                        CORPORATE OFFICE PROPERTIES TRUST
                        OPERATING DATA VARIANCE ANALYSIS

        (DOLLARS FOR THIS TABLE ARE IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>

                                                                      Three Months Ended
                                                                           March 31,
                                                                      ------------------
                                                                                                               % 
                                                                     1999          1998      Variance       Change
                                                                  ----------    --------   ----------       ------

<S>                                                                  <C>        <C>        <C>                <C> 
Revenues
     Rental income                                                $   16,179    $  4,919   $   11,260         229%
     Tenant recoveries and other income                                2,344         606        1,738         287%
                                                                  ----------    --------   ----------             
        Total revenues                                                18,523       5,525       12,998         235%
                                                                  ----------    --------   ----------             
Expenses
     Property operating                                                5,003         899        4,104         457%
     General and administrative                                          889         299          590         197%
     Interest expense and amortization of finance costs                5,418       2,223        3,195         144%
     Depreciation and other amortization                               2,792         977        1,815         186%
     Reformation costs                                                   --          637         (637)       (100%)
                                                                  ----------    --------   ----------             
        Total expenses                                                14,102       5,035        9,067         180%
                                                                  ----------    --------   ----------             
Income before equity in income of Service Companies, gain on
     sale of rental properties, minority interests and
     extraordinary item                                                4,421         490        3,931         802%
Equity in income of Service Companies                                    181         --           181          N/A
Gain on sales of rental properties                                       986         --           986          N/A
                                                                  ----------    --------   ----------             
Income before minority interests                                       5,588         490        5,098       1,040%
Minority interests                                                    (1,349)       (989)        (360)         36%
Extraordinary item                                                      (694)        --          (694)         N/A
                                                                  ----------    --------    ----------            
Net income (loss)                                                      3,545        (499)       4,044          N/A
Preferred Dividends                                                     (338)        --          (338)         N/A
                                                                  ----------    --------    ---------             
Net income (loss) available to Common Shareholders                $    3,207    $   (499)   $   3,706          N/A
                                                                  ----------    --------    ---------             
                                                                  ----------    --------    ---------             
Earnings (loss) per Common Share
     Basic                                                        $     0.19    $  (0.22)   $    0.41          N/A
     Diluted                                                      $     0.17    $  (0.22)   $    0.39          N/A

</TABLE>


     Our total revenues increased $13 million or 235%, of which $11.3 million
was generated by rental income and $1.7 million by tenant recoveries and other
income. Tenant recovery income includes payments from tenants as reimbursement
for property taxes, insurance and other property operating expenses. Our growth
in revenues was due mostly to our property acquisitions in 1998 and 1999,
although revenues increased $220,000 due to increases in operating expense
reimbursements and other income at properties we owned since the beginning of
1998 and decreased $92,000 due to our Midwest region retail property sales.

     Our total expenses increased $9.1 million or 180% due mostly to the effects
of the increases in property operating, interest expense and amortization of
deferred finance costs, depreciation and amortization and general and
administrative expenses described below. However, our expenses for the three
months ended March 31, 1998 also included $637,000 in nonrecurring costs
associated with our reformation into a Maryland REIT in March 1998.


                                       17
<PAGE>


     Our property operating expenses increased $4.1 million or 457% due mostly
to our property acquisitions, although $85,000 of the increase is attributable
to increases relating to properties we owned since the beginning of 1998. Our
interest expense and amortization of deferred financing costs increased $3.2
million or 144% due mostly to our borrowings and assumptions of debt needed to
finance property acquisitions, although a decrease of $51,000 is attributable to
our Midwest region retail property sales. Our depreciation and amortization
expense increased $1.8 million or 186% due mostly to our property acquisitions.

     Our general and administrative expenses increased $590,000 or 197%. Much of
this increase is due to the arrangement we entered into with COMI necessitated
by our growing portfolio of properties and the desire to enhance our
organizational infrastucture to more efficiently meet tenant needs and further
the growth of the Company. Approximately $100,000 of this increase is due to
additional professional fees for audit, legal and tax preparation required to
support the increased complexity of our organization resulting from our growth
and creation of our Operating Partnership and the Service Companies. In
addition, approximately $80,000 of this increase resulted from external costs we
incurred for public relations and marketing. However, our general and
administrative expenses decreased as a percentage of total revenue.


     Our income before minority interests for the three months ended March 31,
1999 includes our equity in income from the Service Companies and the gain we
realized on the sale of four of our retail properties, items that were not
present for the three months ended March 31, 1998.

     As a result of the above factors, income before minority interests
increased by $5.1 million, or 1,040%. Our income allocation to minority
interests increased $360,000 or 36%. The amounts reported for minority interests
on our Consolidated Statements of Operations represent the portion of the
Operating Partnership's net income not allocated to us. Minority interests owned
15% of the Operating Partnership during the three months ended March 31, 1999
versus 79% during the three months ended March 31, 1998. Accordingly, the
increase in income allocated to minority interests is due to the increase in the
Operating Partnership's net income, offset by the decreased percentage of income
allocated to minority interests.


     Our net income available to Common Shareholders increased $3.7 million due
to the factors discussed above partially offset by a $694,000 loss on the
retirement of debt and $338,000 in dividends declared on our Series A Preferred
Shares, items that were not present for the three months ended March 31, 1998.
Our diluted earnings per Common Share increased $0.41 per share due to the
effect of the increase in net income being proportionately greater than the
dilutive effects of (i) our share offering in April 1998, (ii) the issuance of
Common Shares and Common Units in our Operating Partnership in connection with
our property acquisitions during the later portion of 1998 and (iii) the
issuance of Common Units in connection with the acquisition of Glacier in March
1999.


LIQUIDITY AND CAPITAL RESOURCES


CAPITALIZATION AND LIQUIDITY

     Cash provided from operations represents our primary source of liquidity to
fund shareholder and unitholder distributions, pay debt service and fund working
capital requirements. We expect to continue to use our property cash flow to
meet our short-term cash requirements, including all property expenses, general
and administrative expenses, debt service, distribution requirements and
recurring capital improvements and leasing commissions. We do not anticipate
borrowing to meet these requirements.


     We have financed our property acquisitions using a combination of
borrowings secured by our properties and the equity issuances of Common and
Preferred Units in our Operating Partnership and Common and Preferred Shares. We
use our Revolving Credit Facility to finance much of our investing and financing
activities. We pay down our Revolving Credit Facility using proceeds from
long-term borrowings collateralized by our properties as attractive financing
conditions arise. As of May 11, 1999, the maximum amount available under the
Revolving Credit Facility was $100.0 million, of which $15.0 million was unused.


                                       18
<PAGE>


     Our debt strategy favors long-term, fixed-rate debt over variable-rate debt
to minimize the risk of short-term increases in interest rates. As of March 31,
1999, 79% of our mortgage loans payable balance carried fixed interest rates.
Our scheduled principal payment requirements in 1999 and 2000 will be limited to
normal debt service that we expect to fund using property cash flow, assuming we
exercise existing options to extend loan maturity dates.


     Mortgage loans payable at March 31, 1999 consisted of the following
(dollars in thousands):


<TABLE>

<S>                                                                                  <C>     
Term Credit Facility, 7.50%, maturing October 2000 (1)                                $100,000
TIAA Mortgage, 6.89%, maturing November 2008                                            84,482
Revolving Credit Facility, LIBOR + 1.75%, maturing May 2000 (2)                         81,950
Aegon USA Realty Advisors, Inc., 8.29%, maturing May 2007                                6,332
FMB Bank, LIBOR + 1.6%, maturing February 2001 (3)                                       4,866
Provident Bank of Maryland, LIBOR + 1.75%, maturing September 2000                       2,886
Provident Bank of Maryland, LIBOR + 1.75%, maturing February 2001 (4)                    2,736
Other Mortgages - Retail Properties, fixed rates ranging from 7.63% to
   8.0%, maturities ranging from 2011 to 2014 (5)                                        7,584
                                                                                      --------
                                                                                      $290,836
                                                                                      --------
                                                                                      --------
</TABLE>

(1) May be extended for two one-year periods, subject to certain conditions. 
(2) May be extended for a one-year period, subject to certain conditions. 
(3) Construction loan with a total commitment of $9,825. 
(4) Construction loan with a total commitment of $10,875. 
(5) Repaid $988 on May 4, 1999 using proceeds from the Glendale sale.



     We have no contractual obligations for property acquisitions or material
capital costs, other than the April and May 1999 property acquisitions and
dispositions discussed below, and the completion of the two development projects
discussed below and tenant improvements in the ordinary course of business. We
expect to meet our long-term capital needs through a combination of cash from
operations, additional borrowings and additional equity issuances of Common
Shares, Preferred Shares, Common Units and/or Preferred Units. We have effective
a Form S-3 shelf registration statement on file with the Securities and Exchange
Commission, under which we may sell up to $250 million in equity securities
depending upon our needs and market conditions. We also expect to generate cash
proceeds from the sale of our four remaining retail properties.


INVESTING AND FINANCING ACTIVITIES FOR THE THREE MONTHS ENDED MARCH 31, 1999:

     During the three months ended March 31, 1999, our property acquisitions
activity consisted solely of the acquisition of Airport XXI Property, an office
building located in Linthicum, Maryland totaling approximately 68,000 square
feet. We acquired the property for $6.8 million, including $201,000 in
transaction costs, using $6.7 million in borrowings under our Revolving Credit
Facility and cash reserves for the balance.

     During the three months ended March 31, 1999, we had construction 
underway on an aggregate of 198,000 square feet of new office space at our 
Woodlands II and 134 National Business Parkway properties. We entered into 
$20.7 million in construction loans during this period to finance the 
construction of these projects. Borrowings under these loans totaled $7.6 
million at March 31, 1999.

     During the three months ended March 31, 1999, we sold four retail
properties for $33.4 million, of which $15.9 million was used to pay off the
mortgage loans payable on the properties. We realized a gain of $986,000 on the
sales of these properties, including the value of the transaction involving
Glacier (discussed below). Net proceeds from these sales totaled $16.8 million,
$14.7 million of which was used to repay a portion of our Revolving Credit
Facility and the remainder was applied to working capital.


                                       19
<PAGE>


     On March 19, 1999, our Operating Partnership issued 200,000 Common Units
valued at $1,487 ($7.4375 per unit) in exchange for all of the ownership
interests in Glacier. For accounting purposes, we recorded the value of this
transaction against the gain on the sale of our retail properties in the Midwest
region of the United States.

INVESTING AND FINANCING ACTIVITIES SUBSEQUENT TO THE THREE MONTHS ENDED MARCH
31, 1999:


     On April 8, 1999, we obtained a $12.5 million mortgage loan payable from
FMB Bank, $9.0 million of which is nonrecourse. The loan provides for monthly
payments of interest, at a rate of LIBOR plus 1.75%, and principal of $23,000 in
the loan's first year, $25,000 in the second year and $27,000 in the third year.
The loan matures on May 1, 2002. This loan is collateralized by three of our
operating properties and one parcel of land. The proceeds from this loan were
used to pay down our Revolving Credit Facility.


     On April 16, 1999, we acquired the Parkway Crossing Properties, two office
buildings located in Hanover, Maryland totaling approximately 99,000 square
feet. We acquired these properties for $9.3 million, including transaction
costs, by assuming $5.0 million in debt, issuing 326,768 Common Units in our
Operating Partnership valued at $3.4 million ($10.50 per unit) and using
$938,000 in borrowings under our Revolving Credit Facility.


     In connection with the acquisition of the Parkway Crossing Properties, we
assumed three nonrecourse mortgage loans payable collateralized by these
buildings. One of these loans is with IDS Life Insurance Company. This loan has
a balance of $3.1 million, bears interest at a fixed rate of 8.375% and provides
for monthly principal and interest payments of $44,000. This loan matures on
June 1, 2007. The other two loans are with the seller. The two loans with the
seller, which carry identical terms, have a combined balance of $1.9 million,
bear interest at the lesser of Prime plus 0.5% or 9.38% (currently 8.25%) and
provide for monthly payments of interest plus fixed principal payments of
$4,000. These loans mature on May 25, 2007.


     On April 28, 1999, we acquired the Commons Corporate Portfolio, eight
office buildings totaling approximately 250,000 square feet and a contiguous
parcel of land located in Hanover, Maryland. We purchased these properties for
$25.9 million, including transaction costs, using $24.8 million in borrowings
under our Revolving Credit Facility and cash reserves for the balance.

     On May 4, 1999, we sold a retail property located in Glendale, Wisconsin
for $1.9 million of which $988,000 was used to pay off the mortgage payable on
the property. We realized a gain of $100,000 on this sale and net proceeds of
$791,000. The proceeds from this sale were applied to our cash reserves.

     On May 5, 1999, we obtained a $10.0 million loan from Bankers Trust
Company. The loan bears interest at a rate of LIBOR plus 1.75% and provides for
monthly payments of interest only. The proceeds from this loan were used to pay
down our Revolving Credit Facility. The loan matures on November 5, 1999 and is
collateralized by the Commons Corporate Portfolio.

STATEMENT OF CASH FLOWS

     We generated net cash flow from operations of $6.5 million in the three
months ended March 31, 1999, an increase of $5.5 million from the three months
ended March 31, 1998. Our increase in cash flows from operations is due mostly
to income generated from our newly acquired properties. Our net cash flow used
in investing activities for the three months ended March 31, 1999 decreased
$604,000 from the three months ended March 31, 1998 due mostly to the $16.8
million in proceeds generated from our retail property sales, offset by $13.8
million in additional cash outlays associated with purchases of and improvements
to real estate properties during the period and $2.2 million in advances made to
the Service Companies (see Note 1 to the financial statements). Our net cash
flow used in financing activities for the three months ended March 31, 1999
increased $3.8 million from the three months ended March 31, 1998 due mostly to
$19.1 million in additional repayments of mortgage loans payable and $3.4
million in additional dividend and distribution payments during the period,
offset by $19.1 million in additional proceeds from mortgage loans payable.


                                       20
<PAGE>


FUNDS FROM OPERATIONS

     We consider Funds from Operations ("FFO") to be meaningful to investors as
a measure of the financial performance of an equity REIT when considered with
the financial data presented under generally accepted accounting principles
("GAAP"). Under the National Association of Real Estate Investment Trusts'
("NAREIT") definition, FFO means net income (loss) computed using generally
accepted accounting principles, excluding gains (or losses) from debt
restructuring and sales of property, plus real estate-related depreciation and
amortization and after adjustments for unconsolidated partnerships and joint
ventures. Further, if the conversion of securities into common shares is
dilutive, we exclude any GAAP income allocated to these securities in computing
FFO. The FFO we present may not be comparable to the FFO of other REITs since
they may interpret the current NAREIT definition of FFO differently or they may
not use the current NAREIT definition of FFO. FFO is not the same as cash
generated from operating activities or net income determined in accordance with
GAAP. FFO is not necessarily an indication of our cash flow available to fund
cash needs. Additionally, it should not be used as an alternative to net income
when evaluating our financial performance or to cash flow from operating,
investing and financing when evaluating our liquidity or ability to make cash
distributions or pay debt service. Our FFO for the three months ended March 31,
1999 and 1998 are summarized in the following table.


                                       21
<PAGE>

<TABLE>
<CAPTION>

                                                                      For the three months ended
                                                                               March 31,
                                                                    -----------------------------
                                                                      (Dollars and shares for
                                                                         this table are in
                                                                            thousands)

                                                                         1999              1998
                                                                       ---------         --------
<S>                                                                   <C>                <C>   
      Income before minority interests...................             $  5,588           $  490
      Add: Nonrecurring charges
        Reformation costs................................                  --               637
      Add:  Real estate related depreciation and
        amortization.....................................                2,774              972
      Less: Preferred Unit distributions.................                 (853)            (853)
      Less: Preferred Share dividends....................                 (338)            -- 
      Less: Gain on sales of rental properties...........                 (986)            -- 
                                                                       ---------         --------
      Funds from operations..............................                6,185            1,246
      Add: Preferred Unit distributions..................                  853              853
      Add:  Preferred Share dividends....................                  338             -- 
                                                                       ---------         --------
      Funds from operations assuming conversion of
        Preferred Units and Preferred Shares.............                7,376            2,099
      Less:  Straight line rent adjustments..............                 (675)            (359)
      Less:  Recurring capital improvements..............                 (669)            --  
                                                                       ---------         --------
      Adjusted funds from operations assuming conversion of
        Preferred Units and Preferred Shares..............            $  6,032         $  1,740  
                                                                      ---------         --------
                                                                      ---------         --------
      Weighted average Common Shares.....................               16,802            2,268
      Conversion of Common Units.........................                2,759            2,582
                                                                      ---------         --------
      Weighted average Common Shares/Units...............               19,561            4,850
      Assumed conversion of share options................                    8               26
      Conversion of Preferred Shares.....................                1,845             --
      Conversion of Preferred Units......................                7,500            7,500
                                                                      ---------         --------
      Weighted average Common Shares/Units assuming
        conversion of Preferred Units and Preferred Shares              28,914           12,376
                                                                      ---------         --------
                                                                      ---------         --------

</TABLE>


INFLATION

     We have not been significantly impacted by inflation during the periods
presented in this report. This is mostly because of the relatively low inflation
rates in our markets. Most of our tenants are contractually obligated to pay
their share of operating expenses, thereby reducing exposure to increases in
such costs resulting from inflation.

IMPACT OF THE YEAR 2000 ISSUE

     Many older computer software programs refer to years in terms of their
final two digits only. Such programs may interpret the year 2000 to mean the
year 1900 instead. If not corrected, this could result in a system failure or
miscalculations causing disruption of operations, including a temporary
inability to process transactions, prepare financial statements, send invoices
or engage in similar normal business activity.


     Our accounting software system was certified as Year 2000 compliant by its
manufacturer. Accordingly, we do not anticipate problems in processing the
billing and collection of revenue, paying of expenditures, recording of
financial transactions, preparing financial statements and maintaining and
generating system driven managerial information. Our information technology and
accounting groups are conducting internal tests to 



                                       22
<PAGE>

ensure compliance. This testing process is estimated to be completed by the
second quarter of 1999. Our accounting department has developed a plan that will
enable a certain amount of manual processing to take place in the unlikely event
that problems arise with our accounting software.

     Our property management team has been continually evaluating the impact of
the Year 2000 Issue on the various facets of property operating systems since
the beginning of 1998. This evaluation process will continue through the second
quarter of 1999. Based on the current status of this evaluation process, we do
not anticipate any material adverse consequences on property operations. Our
property management team has alternative plans in place to address unexpected
problems that may arise with the property operating systems. Additional property
management staff will also be on-call to respond to any such problems beginning
January 1, 2000.


     We rely on third party suppliers for a number of key services. Interruption
of supplier operations due to the Year 2000 Issue could affect our operations.
We also are dependent upon our tenants for revenue and cash flow. Interruptions
in tenant operations due to the Year 2000 Issue could result in reduced revenue,
increased receivable levels and cash flow reductions. Our property management
team contacted our significant tenants and suppliers regarding their Year 2000
readiness and is currently in the process of evaluating responses. We are being
continually updated on the status of this process, which is estimated to be
completed by the second quarter of 1999.

     Based on information currently available from our internal assessment, we
do not expect significant incremental costs associated with our Year 2000
activities during 1999. We will also evaluate Year 2000 issues for all future
property acquisitions and development.


ITEM 3.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

     We are exposed to certain market risks associated with our financial
instruments, the most predominant of which is changes in interest rates.
Increases in interest rates can result in increased interest expense under our
revolving credit facility and our other mortgage loans payable carrying variable
interest rate terms. Increases in interest rates can also result in increased
interest expense when our mortgage loans payable carrying fixed interest rate
terms mature and need to be refinanced.

     Based on our variable rate debt balances during the three months ended
March 31, 1999, our interest expense would have increased $150,000 if interest
rates were 1% higher.

     On January 5, 1999, we entered into an interest rate swap agreement with
Bankers Trust Company that fixes our one-month LIBOR base to 5.085% per annum on
a notional amount of $30.0 million through May 2001. While this swap agreement
reduces the impact of an increase in interest rates, the nonperformance of
Bankers Trust Company in this swap agreement, while remote, could result in
material losses. We expect to continue to use such swap agreements to reduce the
impact of interest rate changes.

PART II

ITEM 1.  LEGAL PROCEEDINGS

     We are not currently involved in any material litigation nor, to the best
of our knowledge, is any material litigation currently threatened against us
(other than routine litigation arising in the ordinary course of business,
substantially all of which is expected to be covered by liability insurance).



                                       23
<PAGE>


ITEM 2.  CHANGES IN SECURITIES

a. None

b. None

c. On March 19, 1999, our Operating Partnership issued 200,000 Common Units 
in exchange for all of the ownership interests in Glacier. The issuance of 
these Common Units is exempt from registration under Section 4 (2) of the 
Securities Act of 1933, as amended. These Common Units are exchangeable into 
our Common Shares, subject to certain conditions.

d. 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:

                                       24

<PAGE>


EXHIBIT
  NO.                           DESCRIPTION
- --------  ---------------------------------------------------------------------

2.1       Agreement and Plan of Merger, dated January 31, 1998, among the
          Registrant, the Maryland Company and the Company (filed with the
          Trust's Registration Statement on Form S-4 (Commission File No.
          333-45649) and incorporated herein by reference).

2.2       Assignment of Partnership Interests, dated 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).

2.3       Assignment of Purchase and Sale Agreement, dated 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).

2.4       Assignment of Loan Purchase and Sale Agreement, dated 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).

2.5       Purchase and Sale Agreement, dated 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).

2.6.1     Loan Purchase and Sale Agreement, dated 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).

2.6.2     Amendment to Loan Purchase and Sale Agreement, dated 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).

2.7.1     Purchase and Sale Agreement, dated 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).

2.7.2     Letter Amendment to Purchase and Sale Agreement, dated 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).

2.8.1     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).

2.8.2     First Amendment to Contribution Agreement, dated July 16, 1998,
          between Constellation Properties, Inc. and certain entities controlled
          by Constellation Properties, Inc. (filed with the Company's Current
          Report on Form 8-K on October 13, 1998 and incorporated herein by
          reference).


                                       25
<PAGE>


EXHIBIT
  NO.                           DESCRIPTION
- --------  ---------------------------------------------------------------------

2.8.3     Second Amendment to Contribution Agreement, dated September 28, 1998,
          between Constellation Properties, Inc. and certain entities controlled
          by Constellation Properties, Inc. (filed with the Company's Current
          Report on Form 8-K on October 13, 1998 and incorporated herein by
          reference).

2.9       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).

2.10.1    Option Agreement, dated May 14, 1998, 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).

2.10.2    First Amendment to Option Agreement, dated June 22, 1998, 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).

2.11.1    Option Agreement, dated May 14, 1998, 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).

2.11.2    First Amendment to Option Agreement, dated June 22, 1998, 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).

2.12      Option Agreement, dated September 28, 1998, between Jolly Acres
          Limited Partnership, Arbitrage Land Limited Partnership and the
          Operating Partnership (filed with the Company's Current Report on Form
          8-K on October 13, 1998 and incorporated herein by reference).

2.13      Right of First Refusal Agreement, dated September 28, 1998, between
          Constellation Properties, Inc. and the Operating Partnership (filed
          with the Company's Current Report on Form 8-K on October 13, 1998 and
          incorporated herein by reference).

2.14      Right of First Refusal Agreement, dated September 28, 1998, between
          257 Oxon, LLC and the Operating Partnership (filed with the Company's
          Current Report on Form 8-K on October 13, 1998 and incorporated herein
          by reference).

2.15      Development Property Acquisition Agreement, dated May 14, 1998,
          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).

2.16      Contribution Agreement, dated September 30, 1998, between COPT
          Acquisitions, Inc. and M.O.R. XXIX Associates Limited Partnership
          (filed with the Company's Current Report on Form 8-K on October 28,
          1998 and incorporated herein by reference).


                                       26
<PAGE>

EXHIBIT
  NO.                           DESCRIPTION
- --------  ---------------------------------------------------------------------

2.17      Purchase and Sale Agreement, dated September 30, 1998, between New
          England Life Pension Properties II: A Real Estate Limited Partnership
          and COPT Acquisitions, Inc. (filed with the Company's Current Report
          on Form 8-K on October 28, 1998 and incorporated herein by reference).

2.18.1    Sale-Purchase Agreement, dated August 20, 1998 between South Middlesex
          Industrial Park Associates, L.P. and SM Monroe Associates and COPT
          Acquisitions, Inc. (filed with the Company's Current Report on Form
          8-K on October 28, 1998 and incorporated herein by reference).

2.18.2    First Amendment to Sale-Purchase Agreement, dated October 30, 1998,
          between South Middlesex Industrial Park Associates, L.P. and SM Monroe
          Associates, L.P. and COPT Acquisitions, Inc. (filed with the Company's
          Current Report on Form 8-K on November 16, 1998 and incorporated
          herein by reference).

2.19      Contribution Agreement, dated December 31, 1998, between the Operating
          Partnership and M.O.R. 44 Gateway Associates L.P., RA & DM, Inc. and
          M.R.U. L.P. (filed with the Company's Current Report on Form 8-K on
          January 14, 1999 and incorporated herein by reference).

2.20.1    Purchase and Sale Agreement, dated December 31, 1998, between
          Metropolitan Life Insurance Company and Corporate Office Acquisitions,
          Inc. (filed with the Company's Current Report on Form 8-K on January
          14, 1999 and incorporated herein by reference).

2.20.2    Amendment to Purchase and Sale Agreement, dated December 31, 1998,
          between Metropolitan Life Insurance Company, DPA/Gateway L.P.,
          Corporate Office Acquisitions, Inc., COPT Gateway, LLC and the
          Operating Partnership (filed with the Company's Current Report on Form
          8-K on January 14, 1999 and incorporated herein by reference).

2.21      Contribution Agreement, dated February 24, 1999, between the Operating
          Partnership and John Parsinen, John D. Parsinen, Jr., Enterprise
          Nautical, Inc. and Vernon Beck.

3.1       Amended and Restated Declaration of Trust of Registrant (filed with
          the Registrant's Registration Statement on Form S-4 (Commission File
          No. 333-45649) and incorporated herein by reference).

3.2       Bylaws of Registrant (filed with the Registrant's Registration
          Statement on Form S-4 (Commission File No. 333-45649) and incorporated
          herein by reference).

4.1       Form of certificate for the Registrant's Common Shares of Beneficial
          Interest, $0.01 par value per share (filed with the Registrant's
          Registration Statement on Form S-4 (Commission File No. 333-45649) and
          incorporated herein by reference).

4.2       Amended and Restated Registration Rights Agreement, dated March 16,
          1998, for the benefit of certain shareholders of the Company (filed
          with the Company's Quarterly Report on Form 10-Q on August 12, 1998
          and incorporated herein by reference).

4.3       Articles Supplementary of Corporate Office Properties Trust Series A
          Convertible Preferred Shares, dated September 28, 1998 (filed with the
          Company's Current Report on Form 8-K on October 13, 1998 and
          incorporated herein by reference).

4.4.1     Amended and Restated Limited Partnership Agreement of the Operating
          Partnership, 



                                       27
<PAGE>


EXHIBIT
  NO.                           DESCRIPTION
- --------  ---------------------------------------------------------------------
          dated March 16, 1998 (filed with the Company's Quarterly Report on 
          Form 10-Q on August 12, 1998 and incorporated herein by reference).

4.4.2     First Amendment to Amended and Restated Limited Partnership Agreement
          of the Operating Partnership, dated September 28, 1998 (filed with the
          Company's Current Report on Form 8-K on October 13, 1998 and
          incorporated herein by reference).

4.4.3     Second Amendment to Amended and Restated Limited Partnership Agreement
          of the Operating Partnership, dated October 13, 1998 (filed with the
          Company's Current Report on Form 8-K on October 28, 1998 and
          incorporated herein by reference).

4.4.4     Third Amendment to Amended and Restated Limited Partnership Agreement
          of the Operating Partnership, dated December 31, 1998 (filed with the
          Company's Current Report on Form 8-K on January 14, 1999 and
          incorporated herein by reference).

4.5       Registration Rights Agreement, dated September 28, 1998, for the
          benefit of certain shareholders of the Company.

10.1      Clay W. Hamlin III Employment Agreement, dated October 14, 1997, with
          the Operating Partnership (filed with the Company's Current Report on
          Form 8-K on October 29, 1997, and incorporated herein by reference).

10.2      Employment Agreement, dated October 20, 1997, between the Operating
          Partnership and Thomas D. Cassel (filed with the Company's Annual
          Report on Form 10-K on March 25, 1998 and incorporated herein by
          reference).

10.3      Employment Agreement, dated September 28, 1998, between Corporate
          Office Management, Inc. and Randall M. Griffin (filed with the
          Company's Current Report on Form 8-K on October 13, 1998 and
          incorporated herein by reference).

10.4      Employment Agreement, dated September 28, 1998, between Corporate
          Office Management, Inc. and Roger A. Waesche, Jr. (filed with the
          Company's Current Report on Form 8-K on October 13, 1998 and
          incorporated herein by reference).

10.5      Management Agreement between Registrant and Glacier Realty, LLC (filed
          with the Company's Current Report on Form 8-K on October 29, 1997, and
          incorporated herein by reference).

10.6      Senior Secured Credit Agreement, dated October 13, 1997, (filed with
          the Company's Current Report on Form 8-K on October 29, 1997, and
          incorporated herein by reference).

10.7      Corporate Office Properties Trust 1998 Long Term Incentive Plan (filed
          with the Registrant's Registration Statement on Form S-4 (Commission
          File No. 333-45649) and incorporated herein by reference).

10.8      Stock Option Plan for Directors (filed with Royale Investments, Inc.'s
          Form 10-KSB for the year ended December 31, 1993 (Commission File No.
          0-20047) and incorporated herein by reference).

10.9      Lease Agreement between Blue Bell Investment Company, L.P. and Unisys
          Corporation dated March 12, 1997 with respect to lot A (filed with the
          Registrant's Registration Statement on Form S-4 (Commission File No.
          333-45649) and incorporated herein by reference).

10.10     Lease Agreement between Blue Bell Investment Company, L.P. and Unisys
          Corporation, 



                                       28
<PAGE>



EXHIBIT
  NO.                           DESCRIPTION
- --------  ---------------------------------------------------------------------
          dated March 12, 1997, with respect to lot B (filed with the
          Registrant's Registration Statement on Form S-4 (Commission Fil No.
          333-45649) and incorporated herein by reference).

10.11     Lease Agreement between Blue Bell Investment Company, L.P. and Unisys
          Corporation, dated March 12, 1997, with respect to lot C (filed with
          the Registrant's Registration Statement on Form S-4 (Commission File
          No. 333-45649) and incorporated herein by reference).

10.12     Senior Secured Revolving Credit Agreement, dated May 28, 1998, between
          the Company, the Operating Partnership, 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).

10.13     Secured Promissory Note, dated 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).

10.14     Mortgage and Security Agreement, dated 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).

10.15     Amended and Restated Deed of Trust Note, dated October 6, 1995,
          between Cranberry-140 Limited Partnership and Security Life of Denver
          Insurance Company (filed with the Company's Current Report on Form 8-K
          on October 13, 1998 and incorporated herein by reference).

10.16.1   Promissory Note, dated September 15, 1995, between Tred Lightly
          Limited Liability Company and Provident Bank of Maryland (filed with
          the Company's Current Report on Form 8-K on October 13, 1998 and
          incorporated herein by reference).

10.16.2   Allonge to Promissory Note, dated September 28, 1998, between Tred
          Lightly Limited Liability Company and Provident Bank of Maryland
          (filed with the Company's Current Report on Form 8-K on October 13,
          1998 and incorporated herein by reference).

10.17.1   Third Loan Modification and Extension Agreeement, dated November 12,
          1997, between St. Barnabus Limited Partnership, Constellation
          Properties, Inc. and NationsBank, N.A. (filed with the Company's
          Current Report on Form 8-K on October 13, 1998 and incorporated herein
          by reference).

10.17.2   Fourth Loan Modification Agreement, dated September 28, 1998, between
          St. Barnabus Limited Partnership, Constellation Properties, Inc. and
          NationsBank, N.A. (filed with the Company's Current Report on Form 8-K
          on October 13, 1998 and incorporated herein by reference).

10.18.1   Deed of Trust Note, dated September 20, 1988, between Brown's Wharf
          Limited Partnership and Mercantile-Safe Deposit and Trust Company
          (filed with the Company's Current Report on Form 8-K on October 13,
          1998 and incorporated herein by reference).


                                       29
<PAGE>


EXHIBIT
  NO.                           DESCRIPTION
- --------  ---------------------------------------------------------------------
10.18.2   Extension Agreement and Allonge to Deed of Trust Note, dated July 1,
          1994, between Brown's Wharf Limited Partnership and Mercantile-Safe
          Deposit and Trust Company (filed with the Company's Current Report on
          Form 8-K on October 13, 1998 and incorporated herein by reference).

10.19     Consulting Services Agreement, dated April 28, 1998, between the
          Company and Net Lease Finance Corp., doing business as Corporate
          Office Services (filed with the Company's Current Report on Form 8-K
          on October 13, 1998 and incorporated herein by reference).

10.20     Project Consulting and Management Agreement, dated September 28, 1998,
          between Constellation Properties, Inc. and COMI (filed with the
          Company's Current Report on Form 8-K on October 13, 1998 and
          incorporated herein by reference).

10.21     Promissory Note, dated October 22, 1998, between Teachers Insurance
          and Annuity Association of America and the Operating Partnership
          (filed with the Company's Quarterly Report on Form 10-Q on November
          13, 1998 and incorporated herein by reference).

10.22     Indemnity Deed of Trust, Assignment of Leases and Rents and Security
          Agreement, dated October 22, 1998, by affiliates of the Operating
          Partnership for the benefit of Teachers Insurance and Annuity
          Association of America (filed with the Company's Quarterly Report on
          Form 10-Q on November 13, 1998 and incorporated herein by reference).

10.23     Agreement for Services, dated September 28, 1998, between the Company
          and Corporate Office Management, Inc.

10.24.1   Lease Agreement, dated September 28,1998, between St. Barnabus Limited
          Partnership and Constellation Properties, Inc.

10.24.2   First Amendment to Lease, dated December 31, 1998, between St.
          Barnabus, LLC and Constellation Properties, Inc.

10.25.1   Lease Agreement, dated August 3, 1998, between Constellation Real
          Estate, Inc. and Constellation Properties, Inc.

10.25.2   First Amendment to Lease, dated December 30, 1998, between Three
          Centre Park, LLC and Constellation Properties, Inc.

10.26.1   Lease Agreement, dated April 27, 1993, between Constellation
          Properties, Inc. and Baltimore Gas and Electric Company.

10.26.2   First Amendment to Lease, dated December 9, 1998, between COPT
          Brandon, LLC and Baltimore Gas and Electric Company.

27        Financial Data Schedule.



                                       30
<PAGE>


c.  Reports on Form 8-K

We filed the following Current Report on Form 8-K in the three months ended
March 31, 1999:


Item 2 dated January 14, 1999 in connection with acquisitions of a newly
constructed office building located in Anne Arundel County, Maryland on December
30, 1998 and three office buildings and a contiguous parcel of developed land
located in Columbia, Maryland on December 31, 1998, amended February 2, 1999 to
include relevant financial statements and pro forma financial information.


SIGNATURES

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

                                       CORPORATE OFFICE PROPERTIES TRUST



Date: May 14, 1999                     By: /s/ Randall M. Griffin
                                           -------------------------------------
                                           Randall M. Griffin
                                           President and Chief Operating Officer



Date: May 14, 1999                     By: /s/ Roger A. Waesche, Jr.
                                           -------------------------------------
                                           Roger A. Waesche, Jr.
                                           Senior Vice President and Chief 
                                           Financial Officer




                                       31



<PAGE>

                             CONTRIBUTION AGREEMENT

                                     Between

                        CORPORATE OFFICE PROPERTIES, L.P.

                                       And

                JOHN PARSINEN, JOHN D. PARSINEN, JR., ENTERPRISE
                        NAUTICAL, INC. AND VERNON R. BECK

                          Dated as of February 24, 1999

IN MAKING AN INVESTMENT DECISION INVESTORS MUST RELY ON THEIR OWN EXAMINATION OF
THE UPREIT AND THE TERMS OF THE OFFERING, INCLUDING THE MERITS AND RISKS
INVOLVED. THE SECURITIES REFERENCED HEREIN HAVE NOT BEEN RECOMMENDED BY ANY
FEDERAL OR STATE SECURITIES COMMISSION OR REGULATORY AUTHORITY. FURTHERMORE, THE
FOREGOING AUTHORITIES HAVE NOT CONFIRMED THE ACCURACY OR ADEQUACY OF THIS
DOCUMENT. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

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
REGISTRATION OR EXEMPTION THEREFROM. INVESTORS SHOULD BE AWARE THAT THEY MAY BE
REQUIRED TO BEAR THE FINANCIAL RISK OF THIS INVESTMENT FOR AN INDEFINITE PERIOD
OF TIME.


<PAGE>


                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
<S>                                                                           <C>
1.       DEFINITIONS..........................................................3

2.       CONTRIBUTION.........................................................5

3.       CONSIDERATION........................................................5

4.       LP UNITS; INVESTOR MATERIALS.........................................5

5.       REPRESENTATIONS BY CONTRIBUTORS AND BECK.............................7

6.       COVENANTS OF CONTRIBUTORS AND BECK...................................10

7.       INDEMNITY............................................................11

8.       LIMITATION OF LIABILITY..............................................11

9.       BROKERAGE............................................................11

10.      REASONABLE EFFORTS...................................................11

11.      CLOSING..............................................................11

12.      MISCELLANEOUS........................................................13
</TABLE>

                                       2

<PAGE>



         THIS CONTRIBUTION AGREEMENT (this "AGREEMENT") is made and entered into
as of the 24th day of February, 1999 (the "CONTRACT DATE"), by among JOHN
PARSINEN, JOHN D. PARSINEN, JR. and ENTERPRISE NAUTICAL, INC., a Minnesota
corporation (collectively, "CONTRIBUTORS"); VERNON R. BECK ("BECK"); and
CORPORATE OFFICE PROPERTIES, L.P., a Delaware limited partnership ("UPREIT").

                                   BACKGROUND

         A. Contributors collectively own 100% of the membership interests (the
"INTERESTS") in Glacier Realty LLC, a Minnesota limited liability company
("GLACIER REALTY"). The Interests are owned as follows: John Parsinen owns 90
units (I.E. 45% of the Interests), John D. Parsinen, Jr. owns 10 units (I.E. 5%
of the Interests) and Enterprise Nautical, Inc. owns 100 units (I.E. 50% of the
Interests). Beck is the sole stockholder of Enterprise Nautical, Inc. and shall
benefit from the terms of this Agreement.

         B. Glacier Realty has entered into a Management Agreement dated October
14, 1997 with Royale Investments, Inc., the predecessor in interest to Corporate
Office Properties Trust, the general partner of UPREIT ("COPT"). Such Management
Agreement relates to various management acquisition and disposition services to
be performed by Glacier Realty for, and fees due to Glacier Realty from, various
commercial and retail properties owned by COPT or UPREIT, which properties are
intended to be sold. The parties have agreed to enter this Agreement to
facilitate the disposition of those commercial and retail properties.

         C. Contributors, Beck and UPREIT desire to enter into this Agreement
relating to the contribution and conveyance of the Interests to UPREIT in
exchange for 200,000 LP Units (as defined below).

                                    AGREEMENT

         NOW, THEREFORE, for and in consideration of the mutual covenants and
agreements contained in this Agreement, and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged,
intending to be legally bound, the parties agree as follows:

         1.       DEFINITIONS.

                  All terms which are not otherwise defined in this Agreement
shall have the meaning set forth in this Section 1.

                  1.1. "ACCREDITED INVESTOR" shall have the meaning set forth in
Regulation D promulgated under the Securities Act of 1933, as amended.

                  1.2.  "AFFILIATES(S)"  shall mean any entity affiliated with 
or related to the REIT or the UPREIT.

                                       3

<PAGE>

                  1.3.  "AMENDMENT" shall have the meaning set forth in Section 
4.1.1.

                  1.4.  "CLOSING"  or "CLOSING DATE" shall have the meaning set 
forth in Section 11.2 of this Agreement.

                  1.5.  "CONTRIBUTORS" shall have the meaning set forth in the 
opening paragraph to this Agreement.

                  1.6.  "CONVERSION SHARES" shall have the meaning set forth in 
Section 4.1.3.

                  1.7   "EXCHANGE" shall have the meaning set forth in Section 
4.6.

                  1.8   "GOVERNMENTAL AUTHORITY/AUTHORITIES" shall mean any 
agency, commission, department or body of any municipal, township, county,
local, state or federal governmental or quasi-governmental regulatory unit,
entity or authority having jurisdiction or authority over the matter.

                  1.9.  "INDEMNIFIED PARTIES" shall have the meaning set forth 
in Section 7.

                  1.10. "INFORMATIONAL MATERIALS" shall have the meaning set 
forth in Section 4.2. below.

                  1.11. "INVESTOR MATERIALS" shall have the meaning set forth in
Section 4.1.2.

                  1.12. "LOCK-UP PERIOD," as to the LP Units issued at the 
Closing, shall mean the period ending 13 months following the Closing.

                  1.13. "LOSSES" shall have the meaning set forth in Section 7.

                  1.14. "LP UNITS" shall mean the common units in the UPREIT.

                  1.15. "PARTNERSHIP AGREEMENT" shall mean the agreement of
limited partnership of the UPREIT, as amended from time to time.

                  1.16. "RECORDS" shall mean all books, records, tax returns,
correspondence, financial data, leases, and all other documents and matters,
public or private, maintained by Glacier Realty or its agents, relating to
receipts and expenditures pertaining to all of the Property and the Interests
for the three most recent full calendar years and the current calendar year and
all contracts, rental agreements and all other documents and matters, public and
private, maintained by Glacier Realty or its agents, relating to operations of
the Property or the Interests.

                  1.17. "REGISTRATION RIGHTS AGREEMENT" shall mean the
Registration Rights Agreement to be entered into between the Contributors and
UPREIT at the Closing.

                  1.18. "REIT" means Corporate Office Properties Trust, a,
publicly traded Maryland real estate investment trust.

                                       4

<PAGE>

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

                  1.20. "TAXES" shall have the meaning set forth in Section 
5.1.2.3.

                  1.21. "TAX RETURN" shall have the meaning set forth in Section
5.1.2.3.

                  1.22. "UPREIT" means Corporate Office Properties, L.P., a 
Delaware limited partnership.

         2. CONTRIBUTION. Subject to the terms and conditions set forth in this
Agreement, at the Closing Contributors shall contribute, transfer and convey to
the UPREIT, and the UPREIT shall accept from Contributors, all of Contributors'
rights, title and interests in and to the Interests, free and clear of all
liens, claims and encumbrances. At the Closing, Contributors shall relinquish
any rights they may have to any net worth, equity, capital accounts, loan
accounts, cash flow distributions and any other distributions, withdrawals, or
payments of any kind from Glacier Realty.

         3. CONSIDERATION. In consideration of the contribution of the Interests
to the UPREIT, and subject to the terms of this Agreement, at the Closing the
UPREIT shall issue 200,000 LP Units (the "Units") to the Contributors.

         4. LP UNITS; INVESTOR MATERIALS.

                  4.1.     LP UNITS GENERALLY.

                           4.1.1.  The LP Units shall be  redeemable  for shares
of common shares of the REIT on a one-for-one basis or cash (or a combination
thereof) in accordance with the procedures described in the Partnership
Agreement. Contributors acknowledge that the LP Units are not certificated and
that, therefore, the issuance of the LP Units shall be evidenced by the
execution and delivery of an amendment to the Partnership Agreement, which
amendment shall be executed and delivered by the REIT as general partner at the
Closing (the "AMENDMENT").

                           4.1.2.  Contributors  and Beckshall  deliver to 
UPREIT prior to Closing a Certification which provides, among other things,
information concerning Contributors' and Beck's status as Accredited Investors
(or in the case of John D. Parsinen, Jr., his status as a sophisticated
investor). Contributors and Beck shall provide or cause to be provided to
UPREIT, or to any other party designated by UPREIT, such other information and
documentation as may reasonably be requested by UPREIT in furtherance of the
issuance of the LP Units as contemplated hereby (together withsuch
Certification, the "INVESTOR MATERIALS").

                           4.1.3.  Contributors and Beck hereby covenant and 
agree that they shall deliver to UPREIT, or to any other party designated by
UPREIT, any documentation that may be required under the Partnership Agreement
or any charter document of the REIT, and such other information and
documentation as may reasonably be requested by UPREIT, at such time as the 

                                       5

<PAGE>

LP Units are redeemed for shares of common shares of the REIT ("CONVERSION
SHARES"). The preceding covenant shall survive the Closing.

                  4.2. CERTAIN INFORMATIONAL MATERIALS. Contributors and Beck
hereby acknowledge and agree that the ownership of LP Units by Contributors and
their respective rights and obligations as limited partner of the UPREIT
(including, without limitation, the right to transfer, encumber, pledge and
exchange the LP Units) shall be subject to all of the express limitations,
terms, provisions and restrictions set forth in this Agreement and in the
Partnership Agreement. In that regard, Contributors and Beck hereby covenant and
agree that they shall execute any and all documentation reasonably required by
the UPREIT and the REIT to formally memorialize the foregoing. Contributors and
Beck acknowledge that they have received and reviewed, prior to the Closing
Date, (i) the Partnership Agreement, (ii) the charter documents and bylaws of
the REIT, (iii) the REIT's Form 10-K for the year ended December 31, 1997, (iv)
all Form 10-Qs and Form 8-Ks that have been filed by the REIT since December 31,
1997, and (v) copies of all material press releases, proxy statements and
reports to shareholders issued since December 31, 1997, and have otherwise had
an opportunity to conduct a due diligence review of the affairs of the UPREIT
and the REIT and have been afforded the opportunity to ask questions of, and
receive additional information from, the REIT regarding the REIT and the UPREIT.
UPREIT represents that all Federal and state income tax returns required to be
filed by UPREIT and REIT have been so filed.

                  4.3. LOCK-UP PERIOD. Contributors agrees that during the
Lock-Up Period, they shall not, in any way or to any extent, redeem (pursuant to
the Partnership Agreement or otherwise), sell, transfer, assign or otherwise
convey any or all of the LP Units delivered to them in connection with this
transaction.

                  4.4. TRANSFER REQUIREMENTS. During the Lock-Up Period the
Contributors may only pledge or encumber, and after the Lock-Up Period the
Contributors may only sell, transfer, assign, pledge, encumber or otherwise
convey, any or all of the LP Units delivered to them and, if applicable, any
Conversion Shares, in strict compliance with this Agreement, the Partnership
Agreement, the charter documents of the REIT, the registration and other
provisions of the Securities Act (and the rules promulgated thereunder), any
state securities laws, the rules of the New York Stock Exchange and the
Registration Rights Agreement, in each case as may be applicable. A legend may
be placed on the face of the certificates evidencing the Conversion Shares to
notify the holder of the restrictions on transfer under applicable federal or
state securities laws.

                  4.5. TRADING RESTRICTIONS. During the two-year period
following the expiration of the Lock-Up Period, the aggregate amount of
Conversion Shares that the Contributors may sell during any 10-trading day
period shall not exceed 30 percent (30%) of the average of the daily trading
volume of such shares (as reported in The Wall Street Journal) for the 30
trading days immediately preceding the date on which the first sale of such
shares during any such 10-day period occurs.

                  4.6. DISCLAIMER OF TAX MATTERS. Contributors and Beck
acknowledge that they may incur significant income tax by virtue of
Contributors' ownership of the LP Units under 

                                       6

<PAGE>

various circumstances, including but not limited to a reduction or repayment of
debt by the UPREIT or a disposition of Glacier Realty or the Interests acquired.
Contributors and Beck acknowledge that they have relied on the advice of their
own tax counsel in connection with the contribution of the Interests and all
other tax matters relating to the Interests and the LP Units. Contributors and
Beck hereby release the REIT and UPREIT and their officers, directors, partners,
agents, attorneys, accountants and consultants from any and all claims, losses,
or damages resulting from the tax consequences arising to the Contributors and
Beck, including but not limited to adverse tax consequences arising from the
method of allocation selected under Section 4.8 of this Agreement. Contributors
and Beck acknowledge that UPREIT and REIT make no representations or promises
whatsoever as to retaining any debt or providing tax basis to Contributors, nor
is UPREIT or REIT making any representations or warranties as to forbearing from
selling any or all assets directly or indirectly owned by it except as provided
in Section 4.9 hereof. Neither UPREIT nor the REIT warrant, nor shall any of
them be responsible for, the federal, state or local tax consequences to
Contributors or Beck resulting from either (i) the transactions contemplated by
this Agreement or (ii) the allocation, if any, of losses and liabilities of the
UPREIT to Contributors under the Partnership Agreement, the Internal Revenue
Code (the "Code") or Treasury Regulations promulgated under the Code. Neither
the UPREIT nor the REIT shall incur any liability under any document or
agreement required to be executed or delivered in connection with the exchange
of the Interests for the LP Units hereunder (the "Exchange").

                  4.7 FINAL TAX RETURN. As the contribution of the Interests to
the UPREIT will constructively terminate Glacier Realty for federal income tax
purposes, the Contributors acknowledge that UPREIT shall file, and Contributors
will have no right to file, tax returns for Glacier Realty after Closing.

                  4.8 SECTION 704(c) METHOD. Contributors and Beck agree that
the REIT shall have the sole authority to elect a method of allocation under
Section 704(c) of the Internal Revenue Code (the "Code") and the Treasury
Regulations promulgated thereunder in connection with the Exchange. Contributors
and Beck acknowledge that adverse tax consequences may result to them depending
on such method chosen.

                  4.9. LIMITED COVENANT. NOTWITHSTANDING ANYTHING TO THE
CONTRARY CONTAINED OR IMPLIED IN THIS AGREEMENT, UPREIT hereby covenants and
agrees that (a) prior to October 14, 2002, it will not sell the Interests or
Glacier Realty in a taxable disposition, (b) prior to October 14, 2002, it shall
not terminate or dissolve Glacier Realty such that Glacier Realty shall be
deemed to have been sold in a taxable disposition and (c) it will not extend the
term of the Management Agreement (as defined in Section 5.1.9) beyond October
14, 2002. This covenant shall not apply however to (a) any termination or
dissolution of Glacier Realty which would not be deemed a taxable disposition of
Glacier Realty and (b) to the extent the fiduciary obligations of UPREIT or REIT
would require otherwise.

         5.       REPRESENTATIONS BY CONTRIBUTORS AND BECK.

                  5.1. REPRESENTATIONS AND WARRANTIES OF CONTRIBUTORS AND BECK.
In order to induce UPREIT to enter into this Agreement and to issue the LP Units
in consideration for the 

                                       7

<PAGE>

Interests, the Contributors and Beck make the following representations and
warranties as of the Contract Date and as of the Closing, each of which is
material and shall survive the contribution hereof without limitation,
notwithstanding any investigation at any time made by or on behalf of UPREIT.

                  5.1.1.  AUTHORITY.  The execution  and delivery of this  
Agreement by Contributors and Beck, and the performance of this Agreement by
Contributors and Beck, have been duly authorized by Contributors and Beck, and
this Agreement is binding on Contributors and Beck and enforceable against them
in accordance with its terms. Any required consent of any creditor, investor,
partner, shareholder, tenant-in-common, judicial or administrative body,
Governmental Authority, or other governmental body or agency, or other party to
such execution, delivery and performance by Contributors and Beck has been
obtained. Neither the execution of this Agreement nor the consummation of the
transactions contemplated hereby will (i) result in a breach of, default under,
or acceleration of, any agreement to which Contributors, Beck or Glacier Realty
is a party or by which Contributors, Beck or Glacier Realty are bound; or (ii)
violate any restriction, court order, agreement or other legal obligation to
which Contributors, Beck or Glacier Realty are subject.

                  5.1.2.   LIMITED LIABILITY COMPANY AND TAX-RELATED ISSUES.

                  5.1.2.1  Glacier Realty is, and at all times has been,
properly treated as a limited liability company for federal income tax purposes
and not as an "association" or "publicly traded partnership" taxable as a
corporation. Glacier Realty's principal place of business is in Minnesota and it
does not conduct business in any other state.

                  5.1.2.2  No owner of Glacier Realty has pledged or otherwise
encumbered its membership interest in Glacier Realty.

                  5.1.2.3. Glacier Realty has filed or caused to be filed in a
timely manner (within any applicable extension periods) all tax, information or
other returns required to be filed by the Code or by applicable state, or local
tax laws (collectively "TAX RETURNS"). Such Tax Returns are true, correct and
complete in all respects; and all federal, state or local income, gross
receipts, license, payroll, employment, excise, severance, stamp, occupation,
premium unemployment, disability, personal property, sales, use, transfer,
registration, estimated, or other tax of any kind whatsoever, including any
interest, penalty or other addition thereto, whether disputed or not,
(collectively, "TAXES") due, and Taxes due in respect of any person for which
Glacier Realty had an obligation to withhold and/or otherwise pay over Taxes,
have been timely paid in full or will be timely paid in full by the due date
thereof (and whether or not shown on a Tax Return). With respect to any taxable
year for which a statute of limitations (or similar provision) has not yet run,
none of the Tax Returns of Glacier Realty have been audited by a government or
taxing authority, nor is any such audit or other proceeding in process, pending,
threatened (either in writing or verbally, formally or informally)or expected to
be asserted with respect to Taxes (or collection of Taxes) of Glacier Realty,
and Glacier Realty has not received notice (either in writing or verbally,
formally or informally) or expects to receive notice that it has not filed a Tax
Return or not paid Taxes required to be filed, withheld, or paid by it. Glacier
Realty has disclosed on its federal income tax returns all positions taken
therein that could give 

                                       8

<PAGE>

rise to a substantial understatement penalty within the meaning of Code Section
6662. No claim has ever been made by an authority in a jurisdiction where
Glacier Realty does not file Tax Returns that it is or may be subject to
taxation by that jurisdiction.

                  5.1.2.4. The financial statements (including balance sheets)
of Glacier Realty attached hereto as Exhibit 5.1.2.4 are true, correct and
complete. There are no liabilities or obligations, contingent or otherwise, of
Glacier Realty except as shown on the financial statements.

                  5.1.3    UNITED STATES PERSON. Each Contributor is a "United
States Person" within the meaning of Section 1445(f)(3) of the Code, as amended,
and shall have executed and delivered an "Entity Transferor" certification at
Closing.

                  5.1.4.   INVESTMENT REPRESENTATION. Contributors and Beck
represent that the LP Units are being acquired by Contributors with the present
intention of holding such LP Units for purposes of investment, and not with a
view towards sale or any other distribution (other than a distribution which may
take place from Enterprise Nautical, Inc. to Beck, its sole stockholder).
Contributors and Beck recognize that they may be required to bear the economic
risk of an investment in the LP Units for an indefinite period of time.
Contributors and Beck are each an Accredited Investor. Contributors and Beck
have such knowledge and experience in financial and business matters so as to be
fully capable of evaluating the merits and risks of an investment in the LP
Units. No LP Units will be issued, delivered or distributed to any person or
entity who either (i) is a resident of the State of California or New York or
(ii) is other than an Accredited Investor with respect to whom there has been
delivered to UPREIT satisfactory Investor Materials confirming the status of
such person or entity as an Accredited Investor. Contributors and Beck have been
furnished with the informational materials described in Section 4.2 above
(collectively, the "INFORMATIONAL MATERIALS"), and have read and reviewed the
Informational Materials and understand the contents thereof. Contributors and
Beck have been afforded the opportunity to ask questions of those persons they
consider appropriate and to obtain any additional information they desire in
respect of the LP Units and the business, operations, conditions (financial and
otherwise) and current prospects of the UPREIT and REIT. Contributors and Beck
have consulted their own financial, legal and tax advisors with respect to the
economic, legal and tax consequences of delivery of the LP Units and have not
relied on the Informational Materials, the UPREIT, the REIT or any of their
officers, directors, affiliates or professional advisors for such advice as to
such consequences All consents necessary in order to consummate the transactions
contemplated by this Agreement have been obtained. John D. Parsinen, Jr. is
domiciled in the State of Illinois. John Parsinen and Beck are domiciled in and
Enterprise Nautical, Inc. is formed under the laws of the State of Minnesota.

                  5.1.5    AUTHORITY. Contributors and Beck has the right, power
and authority to enter into this Agreement and to contribute the Interests to
UPREIT. All consents necessary for the contribution of the Interests to the
UPREIT have been obtained.

                  5.1.6    OWNERSHIP OF INTERESTS. Contributors own the
Interests, free and clear of all liens, charges, encumbrances, restrictive
agreements and assessments. UPREIT has received good and absolute title thereto,
free of all liens, charges, encumbrances, restrictive


<PAGE>

agreements and assessments whatsoever. There are no outstanding options,
contracts, calls, commitments or demands of any nature relating to the
Interests. Any buy-sell agreement among the Contributors regarding the Interests
has been terminated.

                  5.1.7    OWNERSHIP OF ENTERPRISE NAUTICAL, INC. Beck is the
only beneficial owner of Enterprise Nautical, Inc. and no other entity or person
holds any beneficial interest therein.

                  5.1.8    GOVERNING DOCUMENTS. The Operating Agreement and
Member Control Agreement of Glacier Realty has been provided to UPREIT and there
have been no further amendments thereto.

                  5.1.9    MANAGEMENT AGREEMENT. The Management Agreement
between Glacier Realty and Royale Investments, Inc. dated October 14, 1997 (the
"Management Agreement") has been provided to UPREIT and is in full force and
effect.

                  5.1.10.  NO OUTSTANDING OBLIGATIONS. All liabilities,
obligations, costs and expenses of Glacier Realty have been paid in full, and
there are no contingent liabilities of Glacier Realty.

         6.       COVENANTS OF CONTRIBUTORS AND BECK.

                  6.1      GOOD FAITH. All actions required pursuant to this
Agreement that are necessary to effectuate the transaction contemplated herein
will be taken promptly and in good faith by Contributors, and Contributors and
Beck shall furnish UPREIT with such documents or further assurances as UPREIT
may reasonably require.

                  6.2      AVAILABILITY OF RECORDS.

                  6.2.1    Upon UPREIT's reasonable request, for a period of two
years after the Closing, Contributors shall make the Records available to UPREIT
for inspection, copying and audit by UPREIT's designated accountants.

                  6.2.2    In addition, during such two year period Contributors
and Beck shall provide, and cooperate in all reasonable respects in providing,
UPREIT with copies of, or access to, such factual information as may be
reasonably requested by UPREIT, and in the possession or control of Contributors
and Beck, to enable the REIT to issue one or more press releases concerning the
transaction that is the subject of this Agreement, to file a Current Report on
Form 8-K, if, as and when such filing may be required by the SEC and to make any
other filings that may be required by any Governmental Authority.

                  6.3      OPERATIONS. From the Contract Date through the
Closing, Glacier Realty (a) shall not enter into any contract or incur any
obligations or liabilities, (b) shall continue to be operated in the same manner
as existed prior to the Contract Date and (c) shall not be in default of any of
its obligations under the Management Agreement or any other contract.


                                       10
<PAGE>

         7. INDEMNITY. Contributors and Beck jointly and severally, do hereby
agree to and do hereby indemnify, defend and hold harmless the UPREIT and the
REIT and each of their respective partners, officers, directors, shareholders,
agents and employees, and each of their successors and assigns (collectively the
"INDEMNIFIED PARTIES"), from and against any and all claims, losses, demands,
liabilities, suits, administrative proceedings, causes of action, costs and
damages suffered by any Indemnified Party, and reasonable attorneys' fees of
counsel selected by any Indemnified Party and other costs of defense, incurred,
arising against, or suffered by any Indemnified Party, both known and unknown,
present and future, at law or in equity (collectively "LOSSES"), arising out of,
by virtue of or related in any way to, a breach of any representation, warranty
or covenant of Contributors or Beck set forth in this Agreement, and any
liabilities, obligations, expenses and costs, known or unknown, existing or
contingent, relating to Glacier Realty as of the Closing (including but not
limited to obligations under the Management Agreement), whether discovered
before or after Closing.

         8. LIMITATION OF LIABILITY. Neither the UPREIT, REIT or any Affiliate
or their respective members, partners and shareholders shall incur any liability
under any document or agreement required in connection with this Agreement, and
UPREIT shall not be required (in connection with this Agreement) to execute any
document or agreement that does not expressly exculpate and release such parties
and their respective successors, assigns, affiliates, officers, shareholders,
partners, employees, agents and representatives from any liability or obligation
arising out of, or in connection with, this Agreement. Neither the UPREIT nor
the REIT shall assume or discharge any debts, obligations, liabilities or
commitments of Glacier Realty whether accrued now or hereafter, fixed or
contingent, known or unknown, other than obligations incurred under the
Management Agreement after the Closing.

         9. BROKERAGE. UPREIT, Contributors and Beck each represents to the
other that it has not dealt with any broker or agent in connection with this
transaction. Each party hereby indemnifies and holds harmless the other party
from all loss, cost and expense (including reasonable attorneys' fees) arising
out of a breach of its representation or undertaking set forth in this Section
9.

         10. REASONABLE EFFORTS. Contributors and Beck shall use its reasonable,
diligent and good faith efforts, to perform as may be necessary or otherwise
reasonably requested by UPREIT to effectuate the Exchange, and to otherwise
carry out the purposes of this Agreement.

         11.      CLOSING.

                  11.1. CONTINGENCY. The Exchange and the transactions
contemplated hereunder shall be contingent upon (a) the approval of this
Agreement by the Board of Directors of the REIT (the "Board Approval") and (b)
the representations contained in Section 5 remaining true and correct as of the
Closing. If such Board Approval has not been given prior to March 31, 1999, then
either Contributors or UPREIT, or if such representations are not true and
correct then UPREIT, may elect in writing to terminate this Agreement, in which
case none of the parties hereunder shall have any further obligations hereunder.

                                       11
<PAGE>

                  11.2. CLOSING. The Closing of the Exchange and the
transactions contemplated hereunder shall take place on a date (the "Closing
Date") specified by UPREIT which shall be no later than 10 days after the Board
Approval. Closing shall occur at the offices of UPREIT at 8815 Centre Park
Drive, Columbia, Maryland 21045 or such other place as may be mutually agreed
upon by the parties.

                  11.3. CONTRIBUTORS' DELIVERIES. At the Closing, the
Contributors and Beck shall deliver to UPREIT the following, each in form and
substance satisfactory to UPREIT and its counsel:

                           11.3.1. An Assignment of Membership Interests
conveying the Interests to UPREIT.

                           11.3.2.  The certification described in Section 
5.1.3. of this Agreement.

                           11.3.3 An amendment to the governing documents of 
Glacier Realty reflecting the withdrawal of the Contributors as members thereof.

                           11.3.4.  The Amendment

                           11.3.5. A closing certificate, signed by the  
Contributors and Beck, certifying that the representations and warranties of
Contributors and Beck contained in this Agreement are true and correct as of the
Closing Date and that all covenants required to be performed by Contributors and
Beck prior to the Closing Date have been performed.

                           11.3.6. A release from Contributors and Beck in favor
of UPREIT, REIT and Glacier Realty.

                           11.3.7.  Such other documents as may be reasonably  
requested by UPREIT in order to consummate the Exchange.

                  11.4. UPREIT'S DELIVERIES. At the Closing, UPREIT shall cause
the following to be delivered to Contributors:

                           11.4.1.  The Registration Rights Agreement.

                           11.4.2.  The Amendment

                           11.4.3.  An opinion of counsel to UPREIT, in form and
substance reasonably satisfactory to Contributors, to the effect that the
Exchange falls within Section 721 of the Code.

         11.5. WITHDRAWALS. Prior to the Closing, the Contributors shall be
entitled to withdraw from Glacier Realty all cash and cash equivalents owned by
Glacier Realty, provided that all liabilities, obligations and expenses of
Glacier Realty shall have been paid in full.


                                       12
<PAGE>

         12.      MISCELLANEOUS.

                  12.1.    ENTIRE AGREEMENT. This Agreement constitutes the
entire understanding between the parties with respect to the transaction
contemplated herein, and all prior or contemporaneous oral agreements,
understandings, representations and statements, and all prior written
agreements, understandings, letters of intent and proposals are merged into this
Agreement. Neither this Agreement nor any provisions hereof may be waived,
modified, amended, discharged or terminated except by an instrument in writing
signed by the party against which the enforcement of such waiver, modification,
amendment, discharge or termination is sought, and then only to the extent set
forth in such instrument.

                  12.2.    CONSTRUCTION. This Agreement shall not be construed
more strictly against one party than against the other merely by virtue of the
fact that it may have been prepared by counsel for one of the parties, it being
recognized that Contributors, Beck and UPREIT have contributed substantially and
materially to the preparation of this Agreement. The headings of various
Sections in this Agreement are for convenience only, and are not to be utilized
in construing the content or meaning of the substantive provisions hereof.

                  12.3.    GOVERNING LAW. This Agreement shall be governed by
and construed in accordance with the laws of the State of Maryland.

                  12.4.    PARTIAL INVALIDITY. The provisions hereof shall be
deemed independent and severable, and the invalidity or partial invalidity or
enforceability of any one provision shall not affect the validity of
enforceability of any other provision hereof.

                  12.5.    EXPENSES. Each party shall bear its own individual
costs and expenses relating to the transaction contemplated hereby, including,
without limitation, fees and expenses of legal counsel or other representatives
for the services used, hired or connected with the proposed transactions
mentioned above.

                  12.6.    COUNTERPARTS. This Agreement may be executed in any
number of identical counterparts, any of which may contain the signatures of
less than all parties, and all of which together shall constitute a single
agreement.

                  12.7.    BINDING EFFECT. This Agreement shall be binding upon
and inure to the benefit of the parties hereto and their respective successors.

                  12.8.    FURTHER ASSURANCES. Contributors and Beck agree to
execute and acknowledge and deliver any further agreements, documents or
instruments that are necessary or desirable in the judgment of UPREIT to carry
out the transactions contemplated hereby.

                  1.9      SURVIVAL. All representations, warranties, covenants
and indemnities contained herein shall survive this Agreement.



                                       13
<PAGE>

         IN WITNESS WHEREOF, the parties hereto have executed this Contribution
Agreement the day and year first above written.


                                  CONTRIBUTORS:


                                  /s/ John Parsinen                  (SEAL)
                                  -----------------------------------  
                                  JOHN PARSINEN



                                  /s/ John D. Parsinen, Jr.          (SEAL)
                                  -----------------------------------  
                                  JOHN D. PARSINEN, JR.



                                  ENTERPRISE NAUTICAL, INC.


                                  By: /s/ Vernon R. Beck             (SEAL)
                                  -----------------------------------  
                                  Vernon R. Beck, President


                                  UPREIT:

                                  CORPORATE OFFICE PROPERTIES, L.P.

                                  By:  Corporate Office Properties Trust,
                                          Its general partner


                                  By: /s/ Randall M. Griffin         (SEAL)
                                     --------------------------------
                                  Name: Randall M. Griffin
                                       ------------------------------------
                                  Title: President
                                        -------------------------------------


                                  BECK:


                                   /s/ Vernon R. Beck                (SEAL)
                                  -----------------------------------
                                  VERNON R. BECK



                                       14

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               MAR-31-1999
<CASH>                                           3,615
<SECURITIES>                                         0
<RECEIVABLES>                                    3,520
<ALLOWANCES>                                        34
<INVENTORY>                                          0
<CURRENT-ASSETS>                                     0
<PP&E>                                         538,237
<DEPRECIATION>                                  10,208
<TOTAL-ASSETS>                                 550,203
<CURRENT-LIABILITIES>                                0
<BONDS>                                        290,836
                                0
                                         10
<COMMON>                                           168
<OTHER-SE>                                     168,515
<TOTAL-LIABILITY-AND-EQUITY>                   550,203
<SALES>                                              0
<TOTAL-REVENUES>                                18,523
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