CORPORATE OFFICE PROPERTIES TRUST
10-Q, 1999-08-13
REAL ESTATE INVESTMENT TRUSTS
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- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                    FORM 10-Q

(Mark one)

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

For the quarterly period ended            JUNE 30 , 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 August 13, 1999, 17,174,171 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>                                                                <C>

PART I:  FINANCIAL INFORMATION

Item 1:   Financial Statements:

            Consolidated Balance Sheets as of June 30, 1999 (unaudited)
             and December 31, 1998                                            3
            Consolidated Statements of Operations for the three and six
             months ended June 30, 1999 and 1998 (unaudited)                  4
            Consolidated Statements of Cash Flows for the six months
             ended June 30, 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                                        18
Item 3:   Quantitative and Qualitative Disclosures About Market Risk         27


PART II:  OTHER INFORMATION

Item 1:   Legal Proceedings                                                  28
Item 2:   Changes in Securities                                              28
Item 3:   Defaults Upon Senior Securities                                    28
Item 4:   Submission of Matters to a Vote of Security Holders                29
Item 5:   Other Information                                                  29
Item 6:   Exhibits and Reports on Form 8-K                                   29


SIGNATURES                                                                   36

</TABLE>





                                       2

<PAGE>

PART I.  FINANCIAL INFORMATION
ITEM 1.  FINANCIAL STATEMENTS

                        CORPORATE OFFICE PROPERTIES TRUST
                           CONSOLIDATED BALANCE SHEETS
                             (DOLLARS IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                   June 30,      December 31,
                                                                     1999            1998
                                                                  -----------    ------------
                                                                  (unaudited)
<S>                                                               <C>             <C>
ASSETS
Commercial real estate properties:
  Operating properties, net                                       $ 534,530       $ 536,228
  Projects under construction                                        25,553          10,659
- --------------------------------------------------------------    ---------       ---------
  Total commercial real estate properties, net                      560,083         546,887

Cash and cash equivalents                                             6,250           2,349
Accounts receivable, net                                              2,040           2,986
Investment in and advances to Service Companies                       4,200           2,351
Deferred rent receivable                                              3,297           2,263
Deferred charges, net                                                 3,862           3,542
Prepaid and other assets                                              3,661           3,299
- --------------------------------------------------------------    ---------       ---------
TOTAL ASSETS                                                      $ 583,393       $ 563,677
- --------------------------------------------------------------    ---------       ---------
- --------------------------------------------------------------    ---------       ---------
LIABILITIES AND SHAREHOLDERS' EQUITY
Liabilities:
  Mortgage and other loans payable                                $ 318,179       $ 306,824
  Accounts payable and accrued expenses                               5,127           3,395
  Rents received in advance and security deposits                     2,743           2,789
  Dividends/distributions payable                                     4,792           4,692
  Other liabilities                                                   1,217            --
- --------------------------------------------------------------    ---------       ---------
Total liabilities                                                   332,058         317,700
- --------------------------------------------------------------    ---------       ---------
Minority interests:
  Preferred Units                                                    52,500          52,500
  Common Units                                                       29,548          24,696
- --------------------------------------------------------------    ---------       ---------
Total minority interests                                             82,048          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 Cumulative Convertible
     Preferred Shares of beneficial interest (984,308 shares
     issued and outstanding)                                             10              10
   1,725,000 designated as Series B Cumulative Redeemable
     Preferred Shares of beneficial interest (none issued
     and outstanding)                                                    --              --
  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                                        175,930         175,802
  Accumulated deficit                                                (6,821)         (7,199)
- --------------------------------------------------------------    ---------       ---------
Total shareholders' equity                                          169,287         168,781
- --------------------------------------------------------------    ---------       ---------

TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY                        $ 583,393       $ 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       For the six months
                                                                 ended June 30,          ended June 30,
                                                            ---------------------     ---------------------
                                                              1999        1998          1999         1998
                                                              ----        ----          ----         ----
<S>                                                         <C>          <C>          <C>          <C>
REVENUES

  Rental income                                             $ 17,023     $  7,058     $ 33,202     $ 11,977
  Tenant recoveries and other income                           2,519          784        4,863        1,390
- --------------------------------------------------------    --------     --------     --------     --------
    Total revenues                                            19,542        7,842       38,065       13,367
- --------------------------------------------------------    --------     --------     --------     --------
EXPENSES
  Property operating                                           5,385        1,645       10,388        2,544
  General and administrative                                     796          359        1,685          658
  Interest                                                     5,226        2,416       10,419        4,575
  Amortization of deferred financing costs                       322           83          547          147
  Depreciation and other amortization                          2,887        1,281        5,679        2,258
  Reformation costs                                             --           --           --            637
- --------------------------------------------------------    --------     --------     --------     --------
    Total expenses                                            14,616        5,784       28,718       10,819
- --------------------------------------------------------    --------     --------     --------     --------
Income before equity in income of Service Companies,
  gain on sales of rental properties, minority interests
  and extraordinary item                                       4,926        2,058        9,347        2,548
Equity in income of Service Companies                            145         --            326         --
- --------------------------------------------------------    --------     --------     --------     --------
Income before gain on sales of rental properties,
  minority interests and extraordinary item                    5,071        2,058        9,673        2,548
Gain on sales of rental properties                               154         --          1,140         --
- --------------------------------------------------------    --------     --------     --------     --------
Income before minority interests and extraordinary item        5,225        2,058       10,813        2,548
Minority interests
  Preferred Units                                               (853)        (853)      (1,706)      (1,706)
  Common Units                                                  (670)        (276)      (1,166)        (412)
- --------------------------------------------------------    --------     --------     --------     --------
Income before extraordinary item                               3,702          929        7,941          430
Extraordinary item - loss on early retirement of debt           (144)        --           (838)        --
- --------------------------------------------------------    --------     --------     --------     --------
NET INCOME                                                     3,558          929        7,103          430
Preferred Share dividends                                       (338)        --           (676)        --
- --------------------------------------------------------    --------     --------     --------     --------
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS                 $  3,220     $    929     $  6,427     $    430
- --------------------------------------------------------    --------     --------     --------     --------
- --------------------------------------------------------    --------     --------     --------     --------
BASIC EARNINGS PER COMMON SHARE
  Income before extraordinary item                          $   0.20     $   0.12     $   0.43     $   0.09
  Extraordinary item                                           (0.01)        --          (0.05)        --
- --------------------------------------------------------    --------     --------     --------     --------
  Net income                                                $   0.19     $   0.12     $   0.38     $   0.09
- --------------------------------------------------------    --------     --------     --------     --------
- --------------------------------------------------------    --------     --------     --------     --------
DILUTED EARNINGS PER COMMON SHARE
  Income before extraordinary item                          $   0.17     $   0.12     $   0.37     $   0.09
  Extraordinary item                                            --           --          (0.04)        --
- --------------------------------------------------------    --------     --------     --------     --------
  Net income                                                $   0.17     $   0.12     $   0.33     $   0.09
- --------------------------------------------------------    --------     --------     --------     --------
- --------------------------------------------------------    --------     --------     --------     --------
</TABLE>

                 See accompanying notes to financial statements.

                                       4

<PAGE>

                        CORPORATE OFFICE PROPERTIES TRUST
                      CONSOLIDATED STATEMENTS OF CASH FLOWS

                             (DOLLARS IN THOUSANDS)
                                   (UNAUDITED)

<TABLE>
<CAPTION>
                                                           For the six months
                                                             ended June 30,
                                                         ---------------------
                                                           1999         1998
                                                         --------     --------
<S>                                                      <C>          <C>
CASH FLOWS FROM OPERATING ACTIVITIES
  Net income                                             $  7,103     $    430
  Adjustments to reconcile net income to net cash
    provided by operating activities:
    Minority interests                                      2,872        2,118
    Depreciation and amortization                           5,679        2,258
    Amortization of deferred financing costs                  547          147
    Equity in income of Service Companies                    (326)        --
    Gain on sales of properties                            (1,140)        --
    Increase in deferred rent receivable                   (1,502)        (742)
    Decrease (increase) in accounts receivable and
      prepaid and other assets                              1,646       (1,029)
    Increase in accounts payable, accrued expenses,
      rents received in advance and security deposits         991        1,517
- ------------------------------------------------------   --------     --------
          Net cash provided by operating activities        15,870        4,699
- ------------------------------------------------------   --------     --------

CASH FLOWS FROM INVESTING ACTIVITIES
   Purchases of and additions to commercial real
     estate properties                                    (57,370)     (95,836)
   Proceeds from sales of operating properties             29,970         --
   Investments in and advances to Service Companies        (1,523)        --
   Leasing commissions paid                                  (531)        (151)
   Increase in prepaid and other assets                       (18)        (143)
- ------------------------------------------------------   --------     --------
       Net cash used in investing activities              (29,472)     (96,130)
- ------------------------------------------------------   --------     --------

CASH FLOWS FROM FINANCING ACTIVITIES
   Proceeds from mortgage and other loans payable          69,478       23,750
   Repayments of mortgage and other loans payable         (42,292)        (174)
   Increase in other liabilities                            1,217         --
   Deferred financing costs paid                             (507)        (510)
   Increase in prepaid and other assets                      (958)        --
   Net proceeds from issuance of Common Shares               --         72,742
   Dividends/distributions paid                            (9,435)      (2,858)
- ------------------------------------------------------   --------     --------
       Net cash provided by financing activities           17,503       92,950
- ------------------------------------------------------   --------     --------

Net increase in cash and cash equivalents                   3,901        1,519

CASH AND CASH EQUIVALENTS
  Beginning of period                                       2,349        3,395
- ------------------------------------------------------   --------     --------
  End of period                                          $  6,250     $  4,914
- ------------------------------------------------------   --------     --------
- ------------------------------------------------------   --------     --------
</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 is a fully
integrated and self-managed real estate investment trust ("REIT"). We focus on
the ownership, management, leasing, acquisition and development of suburban
office properties in select Mid-Atlantic submarkets. 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 June 30, 1999, our portfolio included 61 commercial
real estate properties leased principally for office purposes.

     We conduct our operations principally 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 as of June 30, 1999 follows:

<TABLE>
<CAPTION>
                                                  % Owned by COPT
                                                  ---------------
<S>                                                    <C>
Common Units (see Notes 3 and 15)                       82%
Series A Preferred Units                               100%
Initial Preferred Units (see Notes 3 and 15)             0%

</TABLE>

     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 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%).

                                       6

<PAGE>

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 $576 at June 30, 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 (see Note 15). We have
accrued distributions related to Initial Preferred Units owned by minority
interests of $853 at June 30, 1999 and December 31, 1998.

INTEREST RATE SWAP ARRANGEMENTS

     We recognize the interest rate differential to be paid or received on
interest rate swap agreements as an adjustment to interest expense.

                                       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 before extraordinary item is
as follows (dollars and shares in thousands):

<TABLE>
<CAPTION>
                                              Three Months Ended June 30,    Six Months Ended June 30,
                                              ---------------------------    -------------------------
                                                    1999       1998               1999       1998
                                                   -------    -------            -------    -------
<S>                                                <C>        <C>                <C>        <C>
Numerator:
Net income available to Common Shareholders        $ 3,220    $   929            $ 6,427    $   430
Extraordinary loss                                     144       --                  838       --
                                                   -------    -------            -------    -------
Numerator for basic earnings per share
  before extraordinary item                          3,364        929              7,265        430
Minority interests - Initial Preferred Units           853        853              1,706       --
Minority interests - Preferred Shares                 --         --                  676       --
Minority interests -  Common Units                    --          276               --         --
                                                   -------    -------            -------    -------
Numerator for diluted earnings per share
  before extraordinary item                        $ 4,217    $ 2,058            $ 9,647    $   430
                                                   -------    -------            -------    -------
                                                   -------    -------            -------    -------

Denominator:
Weighted average Common Shares - basic              16,802      7,628             16,802      4,964
Assumed conversion of share options                      9         21                  9         21
Conversion of Initial Preferred Units                7,500      7,500              7,500       --
Conversion of Preferred Shares                        --         --                1,845       --
Conversion of Common Units                            --        2,582               --         --
                                                   -------    -------            -------    -------
Weighted average Common Shares - diluted            24,311     17,731             26,156      4,985
                                                   -------    -------            -------    -------
                                                   -------    -------            -------    -------
</TABLE>

     Our diluted EPS computation for the three months ended June 30, 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 June 30, 1998 only assumes conversion
of Initial Preferred Units and Common Units because conversions of Preferred
Shares would increase diluted EPS in that period.

     Our diluted EPS computation for income before extraordinary item for the
six months ended June 30, 1999 as reported above only assumes conversion of
Preferred Shares and Initial Preferred Units because conversions of Common Units
would increase diluted EPS in that period. Our diluted EPS computation for net
income for the six months ended June 30, 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 six
months ended June 30, 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>
                                                June 30,     December 31,
                                                  1999          1998
                                               ---------     ---------
<S>                                            <C>           <C>
          Land                                 $ 107,830     $ 108,433
          Buildings and improvements             438,301       436,932
          Furniture, fixtures and equipment          339           332
                                               ---------     ---------
                                                 546,470       545,697
          Less: accumulated depreciation         (11,940)       (9,469)
                                               ---------     ---------
                                               $ 534,530     $ 536,228
                                               ---------     ---------
                                               ---------     ---------
</TABLE>

     Projects we had under development consisted of the following:

<TABLE>
<CAPTION>
                                     June 30,   December 31,
                                       1999        1998
                                     --------   ------------
<S>                                   <C>          <C>
          Land                        $12,271      $ 8,941
          Construction in progress     13,282        1,718
                                      -------      -------
                                      $25,553      $10,659
                                      -------      -------
                                      -------      -------
</TABLE>

1999 ACQUISITIONS

     We acquired the following office properties during the six months ended
June 30, 1999:

<TABLE>
<CAPTION>
                                                                             Number
                                                                Date of        of       Total Rentable     Initial
        Project Name                     Location             Acquisition   Buildings    Square Feet        Cost
- -------------------------------     ----------------------    -----------   ---------    -------------     -------
<S>                                 <C>                         <C>           <C>           <C>           <C>
Airport Square XXI                  Linthicum, MD               2/23/99         1            67,913       $  6,751
Parkway Crossing Properties         Hanover, MD                 4/16/99         2            99,026          9,524
Commons Corporate Portfolio (1)     Hanover, MD                 4/28/99         8           250,413         25,442
Princeton Executive Building        Monmouth Junction,  NJ      6/24/99         1            61,300          6,020

</TABLE>

- -------------------
(1)  Does not include $400 allocated to projects under development and $50
     relating to land under a ground lease.

     We also acquired for $2,908 a parcel of land located in Annapolis Junction,
Maryland that is contiguous to certain of our existing operating properties.

                                       9

<PAGE>

1999 DISPOSITIONS

     We sold the following properties during the six months ended June 30, 1999:

<TABLE>
<CAPTION>
                                             Property
                                             Type (1)      Date of      Total Rentable
   Project Name            Location                          Sale         Square Feet      Sale Price
- -------------------     ----------------     --------      --------     --------------     ----------
<S>                     <C>                     <C>         <C>             <C>            <C>
Cranberry Square        Westminster, MD         R           1/22/99         139,988        $ 18,900
Delafield Retail        Delafield, WI           R           2/26/99          52,800           3,303
Indianapolis Retail     Indianapolis, IN        R           3/09/99          67,541           5,735
Plymouth Retail         Plymouth, MN            R           3/09/99          67,510           5,465
Glendale Retail         Glendale, WI            R           5/04/99          36,248           1,900
Peru Retail             Peru, IL                R           6/16/99          60,232           3,750
Browns Wharf            Baltimore, MD           O           6/24/99         103,670          10,575
Oconomowoc Retail       Oconomowoc, WI          R           6/25/99          39,272           2,575

</TABLE>

- -------------------
(1)  "R" indicates retail property; "O" indicates office property.

1999 CONSTRUCTION IN PROGRESS

     At June 30, 1999, we had development underway on three new buildings. We
also had an expansion project underway that will increase the rentable square
footage of one of our properties by approximately 6,000 square feet.

NOTE 5    ACCOUNTS RECEIVABLE

     Our accounts receivable are reported net of an allowance for bad debts of
$51 at June 30, 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>
                                                    June 30,  December 31,
                                                      1999       1998
                                                    -------    -------
<S>                                                 <C>        <C>
          Notes receivable                          $ 3,205    $ 3,205
          Equity investment in Service Companies        935        609
          Advances receivable (payable)                  60     (1,463)
                                                    -------    -------
             Total                                  $ 4,200    $ 2,351
                                                    -------    -------
                                                    -------    -------
</TABLE>

NOTE 7    DEFERRED CHARGES

     Deferred charges consisted of the following:

<TABLE>
<CAPTION>
                                      June 30,    December 31,
                                        1999         1998
                                      -------     ------------
<S>                                   <C>           <C>
          Deferred financing costs    $ 3,055       $ 2,611
          Deferred leasing costs        1,915         1,468
          Deferred other                   24            24
                                      -------       -------
                                        4,994         4,103
          Accumulated amortization     (1,132)         (561)
                                      -------       -------
          Deferred charges, net       $ 3,862       $ 3,542
                                      -------       -------
                                      -------       -------
</TABLE>

                                       10

<PAGE>

NOTE 8    MORTGAGE AND OTHER LOANS PAYABLE

     This section highlights new borrowing arrangements entered into during the
six months ended June 30, 1999.

     On January 5, 1999, we entered into an interest rate swap agreement with
Deutsche Banc Alex. Brown. 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
Allfirst 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 $6,075 at June
30, 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 $4,780 at June
30, 1999.

     On April 8, 1999, we obtained a $12,500 mortgage loan payable from Allfirst
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 assumed three nonrecourse loans in connection with
the acquisition of the Parkway Crossing Properties. We assumed a $3,200
mortgage loan payable from IDS Life Insurance Company. The loan provides for
monthly payments of principal and interest at a fixed rate of 8.375%. The
loan matures on June 1, 2007. We also assumed two loans with the seller
totaling $1,897 that carry identical terms. These loans provide for monthly
payments of interest at a rate equal to the lesser of prime plus 0.5%
(currently 8.5%) or 9.38% plus fixed principal payments of $4. These loans
mature on May 25, 2007.

     On May 5, 1999, we obtained a $10,000 loan from Deutsche Banc Alex. Brown.
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.

                                       11

<PAGE>

NOTE 9    DIVIDENDS AND DISTRIBUTIONS

     The following summarizes our dividends/distributions for the six months
ended June 30, 1999:

<TABLE>
<CAPTION>
                                                                        Dividend/        Total
                                                                       Distribution    Dividend/
                               Record Date          Payable Date        Per Share     Distribution
                               -----------          ------------        ---------     ------------
<S>                          <C>                   <C>                  <C>               <C>
Preferred Shares:
   Fourth Quarter 1998       December 31, 1998     January 15, 1999     $ 0.34375           $ 327
   First Quarter 1999        March 31, 1999        April 15, 1999       $ 0.34375           $ 338
   Second Quarter 1999       June 30, 1999         July 15, 1999        $ 0.34375           $ 338

Common Shares:
   Fourth Quarter 1998       December 31, 1998     January 15, 1999        $ 0.18         $ 3,025
   First Quarter 1999        March 31 ,1999        April 15, 1999          $ 0.18         $ 3,025
   Second Quarter 1999       June 30, 1999         July 15, 1999           $ 0.18         $ 3,025

Initial Preferred Units:
   Fourth Quarter 1998       December 31, 1998     January 15, 1999     $ 0.40625           $ 853
   First Quarter 1999        March 31, 1999        April 15, 1999       $ 0.40625           $ 853
   Second Quarter 1999       June 30, 1999         July 15, 1999        $ 0.40625           $ 853

Common Units:
   Fourth Quarter 1998       December 31, 1998     January 15, 1999        $ 0.18           $ 487
   First Quarter 1999        March 31, 1999        April 15, 1999          $ 0.18           $ 527
   Second Quarter 1999       June 30, 1999         July 15, 1999           $ 0.18           $ 576
</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 six
months ended June 30, 1999, we incurred management fees and related costs of
$1,529 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
$1,831 under this agreement during the six months ended June 30, 1999.

     We had a management agreement with Glacier Realty LLC ("Glacier"), a
company that was partially owned by one of our former 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 for the six months
ended June 30, 1999 and $125 for the six months ended June 30, 1998. On March
19, 1999, our Operating Partnership issued 200,000 Common Units 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.

                                       12

<PAGE>

     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 $41 for the six months ended June 30, 1999
and $40 for the six months ended June 30, 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 six months ended June 30, 1999, we incurred $570 under this contract,
a substantial portion of which was capitalized into the cost of the related
activities.

RENTAL INCOME

     During the six months ended June 30, 1999, we recognized revenue of $206 on
office space leased to COMI and CRM. During the six months ended June 30, 1999,
we recognized revenue of $462 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 six months ended June 30, 1999, we earned interest income of
$144 on notes receivable from the Service Companies.

CONSTRUCTION FEES

     During the six months ended June 30, 1999, the Service Companies earned
construction management fees of $58 from an entity owned by an officer and
Trustee of ours.

LEASING COMMISSION

     During the six months ended June 30, 1999, the Service Companies earned a
leasing commission of $117 from an entity owned by an officer and Trustee of
ours.

FEES EARNED FROM CONSTELLATION AND BGE

     During the six months ended June 30, 1999, the Service Companies earned
$750 from a project consulting and management agreement with Constellation. The
Service Companies also earned $242 in fees and expense reimbursements during the
six months ended June 30, 1999 under a property management agreement with BGE.

UTILITIES EXPENSE

     During the six months ended June 30, 1999, BGE provided utility services to
most of our properties in the Baltimore/Washington Corridor.

                                       13

<PAGE>

NOTE 11   SUPPLEMENTAL INFORMATION TO STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>

                                                               For the Six Months Ended
                                                                      June 30,
                                                              --------------------------
                                                                1999            1998
                                                              --------         --------
<S>                                                           <C>              <C>
Supplemental schedule of non-cash investing and
  financing activities:

Debt repaid in connection with sales of properties            $ 20,928         $   --
                                                              --------         --------
                                                              --------         --------
Debt assumed in connection with acquisitions                  $  5,097         $  6,465
                                                              --------         --------
                                                              --------         --------
Increase in minority interests resulting from issuance
  of Common Units in connection with property acquisitions    $  3,431         $   --
                                                              --------         --------
                                                              --------         --------
Increase in minority interests resulting from issuance
  of Common Units in connection with Glacier acquisition      $  1,487         $   --
                                                              --------         --------
                                                              --------         --------

Adjustments to minority interests resulting from changes
  in ownership of Operating Partnership by COPT               $   (128)        $   --
                                                              --------         --------
                                                              --------         --------

Increase in accrued capital improvements                      $    765         $   --
                                                              --------         --------
                                                              --------         --------
Dividends/distributions payable                               $  4,792         $  2,706
                                                              --------         --------
                                                              --------         --------
</TABLE>

                                       14

<PAGE>

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 property operating expenses. Accordingly, we do not
report other expenses by segment in the table below.

<TABLE>
<CAPTION>
                                         Baltimore/      Greater       Northern/
                                         Washington    Philadelphia   Central New
                                           Office         Office      Jersey Office       Other           Total
                                         ------------------------------------------------------------------------
<S>                                      <C>             <C>             <C>             <C>             <C>
Three Months Ended June 30, 1999:
Revenues                                 $ 11,420        $  2,507        $  4,067        $  1,548        $ 19,542
Property operating expenses                 3,460              20           1,546             359           5,385
                                         --------        --------        --------        --------        --------
Income from operations                   $  7,960        $  2,487        $  2,521        $  1,189        $ 14,157
                                         --------        --------        --------        --------        --------
                                         --------        --------        --------        --------        --------
Commercial real estate property
    expenditures                         $ 36,819        $   --          $  7,131        $  8,760        $ 52,710
                                         --------        --------        --------        --------        --------
                                         --------        --------        --------        --------        --------

Three Months Ended June 30, 1998:
Revenues                                 $  1,913        $  2,507        $  1,988        $  1,434        $  7,842
Property operating expenses                   631               3             696             315           1,645
                                         --------        --------        --------        --------        --------
Income from operations                   $  1,282        $  2,504        $  1,292        $  1,119        $  6,197
                                         --------        --------        --------        --------        --------
                                         --------        --------        --------        --------        --------

Commercial real estate property
    expenditures                         $ 72,710        $   --          $ 29,467        $     42        $102,219
                                         --------        --------        --------        --------        --------
                                         --------        --------        --------        --------        --------

Six Months Ended June 30, 1999:
Revenues                                 $ 21,734        $  5,013        $  8,163        $  3,155        $ 38,065
Property operating expenses                 6,527              42           3,050             769          10,388
                                         --------        --------        --------        --------        --------
Income from operations                   $ 15,207        $  4,971        $  5,113        $  2,386        $ 27,677
                                         --------        --------        --------        --------        --------
                                         --------        --------        --------        --------        --------
Commercial real estate property
    expenditures                         $ 43,904        $   --          $  7,911        $ 14,848        $ 66,663
                                         --------        --------        --------        --------        --------
                                         --------        --------        --------        --------        --------
Segment assets at June 30, 1999          $301,440        $108,242        $104,787        $ 68,924        $583,393
                                         --------        --------        --------        --------        --------
                                         --------        --------        --------        --------        --------

Six Months Ended June 30, 1998:
Revenues                                 $  1,913        $  5,013        $  3,608        $  2,833        $ 13,367
Property operating expenses                   631               6           1,280             627           2,544
                                         --------        --------        --------        --------        --------
Income from operations                   $  1,282        $  5,007        $  2,328        $  2,206        $ 10,823
                                         --------        --------        --------        --------        --------
                                         --------        --------        --------        --------        --------
Commercial real estate property
    expenditures                         $ 72,710        $   --          $ 29,467        $    124        $102,301
                                         --------        --------        --------        --------        --------
                                         --------        --------        --------        --------        --------

Segment assets at June 30, 1998          $ 72,877        $109,548        $ 61,367        $ 53,733        $297,525
                                         --------        --------        --------        --------        --------
                                         --------        --------        --------        --------        --------
</TABLE>

                                       15

<PAGE>

     The following table reconciles our income from operations for reportable
segments to income before extraordinary item as reported in our Consolidated
Statements of Operations.

<TABLE>
<CAPTION>
                                                      Three Months Ended June 30,       Six Months Ended June 30,
                                                      ---------------------------       -------------------------
                                                        1999             1998             1999             1998
                                                      --------         --------         --------         --------
<S>                                                   <C>              <C>              <C>              <C>
Income from operations for reportable segments        $ 14,157         $  6,197         $ 27,677         $ 10,823
Add:
      Equity in income of Service Companies                145             --                326             --
      Gain on sales of rental properties                   154             --              1,140             --
Less:
      General and administrative                          (796)            (359)          (1,685)            (658)
      Interest                                          (5,226)          (2,416)         (10,419)          (4,575)
      Amortization of deferred financing costs            (322)             (83)            (547)            (147)
      Depreciation and amortization                     (2,887)          (1,281)          (5,679)          (2,258)
      Reformation costs                                   --               --               --               (637)
      Minority interests                                (1,523)          (1,129)          (2,872)          (2,118)
                                                      --------         --------         --------         --------
Income before extraordinary item                      $  3,702         $    929         $  7,941         $    430
                                                      --------         --------         --------         --------
                                                      --------         --------         --------         --------
</TABLE>

     We did not allocate gain on sales of rental properties, 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 equity in income of Service
Companies, general and administrative and reformation costs and minority
interests since these items represent general corporate items 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 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.

     In June 1999, we sold an office building and assigned our rights to
purchase two office buildings to an unrelated third party. Simultaneously with
these transactions, we entered into a contract with the third party under which
the third party has the right to transfer these three office buildings to us on
or before March 31, 2000 for total consideration of approximately $40.5 million.
Under the terms of the contract, we would pay up to $25.0 million (but in no
event less than $23.9 million) of the acquisition price in convertible Preferred
Units (the "Convertible Preferred Units") in the Operating Partnership and the
balance in cash or debt assumption. We would also issue ten-year detachable
warrants exercisable for an additional number of Common Units in the Operating
Partnership to be determined based upon the share price of the Common Shares
over the first five years following the acquisition. However, if the price of
our Common Shares used to determine the additional number of Common Units equals
or exceeds $14.21, no warrants will be issuable.

     The Convertible Preferred Units issuable under the terms of the contract
will be entitled to a 9% priority annual return for the first ten years
following issuance, 10.5% for the five following years and 12% thereafter. The
Convertible Preferred Units are convertible, subject to certain restrictions,
commencing one year after their issuance into Common Units in the Operating
Partnership on the basis of 2.381 Common Units for each Convertible Preferred
Unit, plus any accrued return. The Common Units are exchangeable for Common
Shares, subject to certain conditions. The Convertible Preferred Units also
carry a liquidation preference of $25.00 per unit, plus any accrued return, and
may be redeemed for cash by the Operating Partnership at any time after the
tenth anniversary of their issuance.

                                       16

<PAGE>

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 June 30, 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>
                                                            Six Months Ended June 30,
                                                            -------------------------
                                                               1999          1998
                                                             --------      --------
<S>                                                          <C>           <C>
Pro forma total revenues                                     $ 39,331      $ 33,052
                                                             --------      --------
                                                             --------      --------
Pro forma net income available to Common Shareholders        $  6,332      $  2,899
                                                             --------      --------
                                                             --------      --------
Pro forma earnings per Common Share
  Basic                                                      $   0.38      $   0.17
                                                             --------      --------
                                                             --------      --------
  Diluted                                                    $   0.33      $   0.17
                                                             --------      --------
                                                             --------      --------
</TABLE>

NOTE 15   SUBSEQUENT EVENTS

     In July 1999, we completed the offering of 1,250,000 Series B Cumulative
Redeemable Preferred Shares of beneficial interest ("Series B Preferred Shares")
to the public at a price of $25.00 per share. These shares are nonvoting and are
redeemable for cash at $25.00 per share at our option on or after July 15, 2004.
Holders of these shares are entitled to cumulative dividends, payable quarterly
(as and if declared by the Board of Trustees). Dividends accrue from the date of
issue at the annual rate of $2.50 per share, which is equal to 10% of the $25.00
per share redemption price. We contributed the net proceeds from the offering to
our Operating Partnership in exchange for 1,250,000 Series B Preferred Units.
The Series B Preferred Units carry terms that are substantially the same as the
Series B Preferred Shares.

     In connection with the Series B Preferred Share offering, all of the
holders of the Initial Preferred Units in our Operating Partnership have agreed
to effectively subordinate their priority return distributions to distributions
designated to the Series B Preferred Shares. Additionally, these unitholders
have agreed to convert their Initial Preferred Units into Common Units on
October 1, 1999.

     On July 9, 1999, we acquired a 57,000 square foot warehouse facility
located on 8.5 acres of land contiguous to properties we own in South Brunswick,
New Jersey. We acquired this property for $2,172.

     On August 4, 1999, 372,295 of our Common Units were converted to Common
Shares.

     On August 12, 1999, we acquired an 89% ownership interest in three newly
constructed office buildings located in Harrisburg, Pennsylvania totaling
approximately 56,000 square feet. We acquired this ownership interest for
$5,960 from an entity owned by an officer and Trustee of ours.

                                       17

<PAGE>

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

OVERVIEW

     Over the last five quarters, 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. During the first two quarters of
1999, we acquired 12 office properties and sold seven retail properties and one
office property. We financed the 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 added
significant management capabilities. As of June 30, 1999, our portfolio included
61 commercial real estate properties leased principally for office 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 and six months ended June 30, 1999. This section
includes discussions on:

- -    why various components of our Consolidated Statements of Operations changed
     for the three and six months ended June 30, 1999 compared to the same
     periods in 1998,

- -    what our primary sources and uses of cash were for the six months ended
     June 30, 1999,

- -    how we raised cash for investing and financing activities during the six
     months ended June 30, 1999,

- -    how we intend to generate cash for future capital expenditures, and

- -    the computation of our funds from operations.

     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 about future events and financial trends
affecting the financial condition of our business. 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
publicly update or revise 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.

                                       18

<PAGE>

                        CORPORATE OFFICE PROPERTIES TRUST
                        OPERATING DATA VARIANCE ANALYSIS

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

<TABLE>
<CAPTION>
                                                   Three Months Ended June 30,               Six Months Ended June 30,
                                            ----------------------------------------  -------------------------------------------
                                              1999       1998    Variance   % Change   1999        1998      Variance    % Change
                                            -------    -------    -------    -------  -------    --------    --------     -------
<S>                                         <C>        <C>        <C>        <C>      <C>        <C>         <C>          <C>
Revenues
   Rental income                            $17,023    $ 7,058    $ 9,965      141%   $33,202    $ 11,977    $ 21,225       177%
   Tenant recoveries and other income         2,519        784      1,735      221%     4,863       1,390       3,473       250%
                                            -------    -------    -------    -----    -------    --------    --------     -----
      Total revenues                         19,542      7,842     11,700      149%    38,065      13,367      24,698       185%
                                            -------    -------    -------    -----    -------    --------    --------     -----

Expenses
   Property operating                         5,385      1,645      3,740      227%    10,388       2,544       7,844       308%
   General and administrative                   796        359        437      122%     1,685         658       1,027       156%
   Interest expense and amortization
     of finance costs                         5,548      2,499      3,049      122%    10,966       4,722       6,244       132%
   Depreciation and other amortization        2,887      1,281      1,606      125%     5,679       2,258       3,421       152%
   Reformation costs                           --         --         --       --         --           637        (637)     (100%)
                                            -------    -------    -------    -----    -------    --------    --------     -----
      Total expenses                         14,616      5,784      8,832      153%    28,718      10,819      17,899       165%
                                            -------    -------    -------    -----    -------    --------    --------     -----
Income before equity in income of Service
   Companies, gain on sales of rental
   properties, minority interests and
   extraordinary item                         4,926      2,058      2,868      139%     9,347       2,548       6,799       267%
Equity in income of Service Companies           145       --          145      N/A        326        --           326       N/A
Gain on sales of rental properties              154       --          154      N/A      1,140        --         1,140       N/A
                                            -------    -------    -------    -----    -------    --------    --------     -----
Income before minority interests and
  extraordinary item                          5,225      2,058      3,167      154%    10,813       2,548       8,265       324%
Minority interests                           (1,523)    (1,129)      (394)      35%    (2,872)     (2,118)       (754)       36%
Extraordinary item                             (144)      --         (144)     N/A       (838)       --          (838)      N/A
                                            -------    -------    -------    -----    -------    --------    --------     -----
Net income                                    3,558        929      2,629      283%     7,103         430       6,673     1,552%
Preferred Share dividends                      (338)      --         (338)     N/A       (676)       --          (676)      N/A
                                            -------    -------    -------    -----    -------    --------    --------     -----
Net income available to Common at
  Shareholders                              $ 3,220    $   929      2,291      247%   $ 6,427    $    430    $  5,997     1,395%
                                            -------    -------    -------    -----    -------    --------    --------     -----
                                            -------    -------    -------    -----    -------    --------    --------     -----
Earnings per Common Share on net income
   Basic                                    $  0.19    $  0.12    $  0.07       58%   $  0.38    $   0.09    $   0.29       322%

   Diluted                                  $  0.17    $  0.12    $  0.05       42%   $  0.33    $   0.09    $   0.24       267%

</TABLE>

                                       19

<PAGE>

COMPARISON OF THE SIX MONTHS ENDED JUNE 30, 1999 AND 1998

     Our total revenues increased $24.7 million or 185%, of which $21.2 million
was generated by rental income and $3.5 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 primarily to our property acquisitions in 1998 and 1999,
although revenues increased $363,000 due to the operations of office properties
owned since the beginning of 1998 and decreased $491,000 due to our Midwest
region retail property sales.

     Our total expenses increased $17.9 million or 165% 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 six months ended June 30, 1998 also included $637,000 in nonrecurring costs
associated with our reformation into a Maryland REIT in March 1998.

     Our property operating expenses increased $7.8 million or 308% due mostly
to our property acquisitions, although $220,000 of the increase is attributable
to increases at office properties owned since the beginning of 1998. Our
interest expense and amortization of deferred financing costs increased $6.2
million or 132% due mostly to our borrowings and assumptions of debt needed to
finance property acquisitions, although a decrease of $230,000 is attributable
to our Midwest region retail property sales. Our depreciation and amortization
expense increased $3.4 million or 152% due mostly to our property acquisitions,
although a decrease of $116,000 is attributable to our Midwest region retail
property sales.

     Our general and administrative expenses increased $1.0 million or 156%.
Much of this increase is due to the addition of management and other staffing
functions necessitated by our growing portfolio of properties and the desire to
enhance our organizational infrastructure to more efficiently meet tenant needs
and further the growth of the Company. Approximately $180,000 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 $100,000 of this increase resulted from external
costs we incurred for public relations and marketing. Our general and
administrative expenses decreased as a percentage of total revenue from 4.9% to
4.4%.

     Our income before minority interests for the six months ended June 30, 1999
includes our equity in income from the Service Companies and the gain we
realized on the sale of six of our retail properties, items that were not
present for the six months ended June 30, 1998.

     As a result of the above factors, income before minority interests
increased by $8.3 million or 324%. Our income allocation to minority interests
increased $754,000 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 16% of
the Operating Partnership during the six months ended June 30, 1999 versus 61%
during the six months ended June 30, 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 $6.0 million due
to the factors discussed above partially offset by a $838,000 loss on the
retirement of debt and $676,000 in dividends declared on our Series A Preferred
Shares, items that were not present for the six months ended June 30, 1998. Our
diluted earnings per Common Share increased $0.24 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.

                                       20

<PAGE>

COMPARISON OF THE THREE MONTHS ENDED JUNE 30,1999 AND 1998

     Our total revenues increased $11.7 million or 149%, of which $10.0 million
was generated by rental income and $1.7 million by tenant recoveries and other
income. Our growth in revenues was due primarily to our property acquisitions in
1998 and 1999, although revenues increased $143,000 due to the operations of
office properties owned since the beginning of 1998 and decreased $399,000 due
to our Midwest region retail property sales.

     Our total expenses increased $8.8 million or 153% 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.

     Our property operating expenses increased $3.7 million or 227% due mostly
to our property acquisitions, although $135,000 of the increase is attributable
to increases at office properties owned since the beginning of 1998. Our
interest expense and amortization of deferred financing costs increased $3.0
million or 122% due mostly to our borrowings and assumptions of debt needed to
finance property acquisitions, although a decrease of $179,000 is attributable
to our Midwest region retail property sales. Our depreciation and amortization
expense increased $1.6 million or 125% due mostly to our property acquisitions.

     Our general and administrative expenses increased $437,000 or 122%. Much of
this increase is due to the addition of management and other staffing functions
necessitated by our growing portfolio of properties and the desire to enhance
our organizational infrastructure to more efficiently meet tenant needs and
further the growth of the Company. Approximately $80,000 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. Our general
and administrative expenses decreased as a percentage of total revenue from 4.6%
to 4.1%.

     Our income before minority interests for the three months ended June 30,
1999 includes our equity in income from the Service Companies and the gain we
realized on the sale of three of our retail properties, items that were not
present for the three months ended June 30, 1998.

     As a result of the above factors, income before minority interests
increased by $3.2 million, or 154%. Our income allocation to minority interests
increased $394,000 or 35%. Minority interests owned 17% of the Operating
Partnership during the three months ended June 30, 1999 versus 40% during the
three months ended June 30, 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 $2.3 million due
to the factors discussed above partially offset by a $144,000 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 June 30, 1998.
Our diluted earnings per Common Share increased $0.05 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

                                       21

<PAGE>

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 secured revolving credit facility with Deutsche Banc Alex. Brown (the
"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 and equity issuances as attractive equity market conditions
arise. As of August 10, 1999, the maximum amount available under our Revolving
Credit Facility was $100.0 million, of which $47.3 million was unused.

     Our debt strategy favors long-term, fixed-rate, secured debt over
variable-rate debt to minimize the risk of short-term increases in interest
rates. As of June 30, 1999, 71% of our mortgage loans payable balance carried
fixed interest rates.

     Mortgage and other loans payable at June 30, 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                              84,150
Revolving Credit Facility, LIBOR + 1.75%, maturing May 2000 (2)           84,050
Allfirst Bank, LIBOR + 1.75%, maturing May 2002                           12,430
Deutsche Banc Alex. Brown, LIBOR + 1.75%, maturing November 1999          10,000
Aegon USA Realty Advisors, Inc., 8.29%, maturing May 2007                  6,293
Allfirst Bank, LIBOR + 1.6%, maturing February 2001 (3)                    6,075
Provident Bank of Maryland, LIBOR + 1.75%, maturing February 2001 (4)      4,780
IDS Life Insurance Company, 8.375%, maturing June 2007                     3,129
Provident Bank of Maryland, LIBOR + 1.75%, maturing September 2000         2,866
Northern Life Insurance Company, 8%, maturing February 2014                2,519
Seller mortgage, lesser of Prime + 0.5% or 9.38%, maturing May 2007        1,887
                                                                       ---------
                                                                       $ 318,179
                                                                       ---------
                                                                       ---------
</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.

     In June 1999, we sold an office building and assigned our rights to
purchase two office buildings to an unrelated third party. Simultaneously with
these transactions, we entered into a contract with the third party under which
the third party has the right to transfer these three office buildings to us on
or before March 31, 2000 for total consideration of approximately $40.5 million.
Under the terms of the contract, we would pay up to $25.0 million (but in no
event less than $23.9 million) of the acquisition price in Convertible Preferred
Units in the Operating Partnership and the balance in cash or debt assumption.
We would also issue ten-year detachable warrants exercisable for an additional
number of Common Units in the Operating Partnership to be determined based upon
the share price of the Common Shares over the first five years following the
acquisition. However, if the price of our Common Shares used to determine the
additional number of Common Units equals or exceeds $14.21, no warrants will be
issuable.

     The Convertible Preferred Units issuable under the terms of the contract
will be entitled to a 9% priority annual return for the first ten years
following issuance, 10.5% for the five following years and 12% thereafter. The
Convertible Preferred Units are convertible, subject to certain restrictions,
commencing one year after their

                                       22

<PAGE>

issuance into Common Units in the Operating Partnership on the basis of 2.381
Common Units for each Convertible Preferred Unit, plus any accrued return. The
Common Units are exchangeable for Common Shares, subject to certain conditions.
The Convertible Preferred Units also carry a liquidation preference of $25.00
per unit, plus any accrued return, and may be redeemed for cash by the Operating
Partnership at any time after the tenth anniversary of their issuance.

     We have no contractual obligations for property acquisitions or material
capital costs other than the contract to acquire three office buildings from an
unrelated third-party described above, the July and August property acquisitions
discussed below, the completion of the three 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 an effective Form
S-3 shelf registration statement on file with the Securities and Exchange
Commission under which we may sell up to $218.8 million in debt or equity
securities depending upon our needs and market conditions.

INVESTING AND FINANCING ACTIVITIES FOR THE SIX MONTHS ENDED JUNE 30, 1999:

     During the six months ended June 30, 1999, we acquired 12 operating
properties and three parcels of land for an aggregate acquisition cost of $51.1
million. Of the 12 operating properties acquired, 11 are located in the
Baltimore/Washington Corridor and one in New Jersey. The land parcels are
located in the Baltimore/ Washington Corridor. The operating property
acquisitions increased our rentable square footage by 479,000. These
acquisitions were financed by:

     -    using $41.3 million in borrowings under our Revolving Credit Facility,

     -    assuming $5.1 million in mortgage loans,

     -    issuing 326,775 Common Units in our Operating Partnership, and

     -    using cash reserves for the balance.

     During the six months ended June 30, 1999, we had construction underway on
an aggregate of 317,000 square feet of new office space that was 85% pre-leased
at our Woodlands II and 132 and 134 National Business Parkway properties. We
entered into $20.7 million in construction loans during this period to finance
the construction of two of these projects. Borrowings under these loans totaled
$10.9 million at June 30, 1999. Also during the six months ended June 30, 1999,
CDS had construction underway on 66,000 square feet of new office space in
Linthicum, Maryland.

     During the six months ended June 30, 1999, we sold eight properties for
$52.2 million, of which $20.9 million was used to pay off the mortgage loans
payable on the properties. We realized a gain of $1.1 million on the sales of
these properties, including the value of the transaction involving Glacier (see
Note 10 to the Consolidated Financial Statements). Net proceeds from these sales
totaled $30.0 million, $24.3 million of which was used to repay a portion of our
Revolving Credit Facility and the remainder was applied to working capital.

     On March 19, 1999, our Operating Partnership issued 200,000 Common Units 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 (see Note 10 to the
Consolidated Financial Statements).

     On April 8, 1999, we obtained a $12.5 million mortgage loan payable from
Allfirst 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.

                                       23

<PAGE>

     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 $3.2 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. We also assumed two loans with the seller totaling $1.9 million
that carry identical terms. These loans provide for monthly payments of interest
at a rate equal to the lesser of prime plus 0.5% (currently 8.5%) or 9.38% plus
fixed principal payments of $4,000. These loans mature on May 25, 2007.

On May 5, 1999, we obtained a $10.0 million loan from Deutsche Banc Alex. Brown.
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.

INVESTING AND FINANCING ACTIVITIES SUBSEQUENT TO THE SIX MONTHS ENDED JUNE 30,
1999:

     In July 1999, we completed the offering of 1,250,000 Series B Preferred
Shares to the public at a price of $25.00 per share. These shares are nonvoting
and are redeemable for cash at $25.00 per share at our option on or after July
15, 2004. Holders of these shares are entitled to cumulative dividends, payable
quarterly (as and if declared by the Board of Trustees). Dividends accrue from
the date of issue at the annual rate of $2.50 per share, which is equal to 10%
of the $25.00 per share redemption price. We contributed the net proceeds from
the offering to our Operating Partnership in exchange for 1,250,000 Series B
Preferred Units. Our Operating Partnership used most of the proceeds to pay down
our Revolving Credit Facility. The Series B Preferred Units carry terms that are
substantially the same as the Series B Preferred Shares.

     In connection with the Series B Preferred Share offering, all of the
holders of the Initial Preferred Units in our Operating Partnership have agreed
to effectively subordinate their priority return distributions to distributions
designated to the Series B Preferred Shares. Additionally, these unitholders
have agreed to convert their Initial Preferred Units into Common Units on
October 1, 1999.

     On July 9, 1999, we acquired a 57,000 square foot warehouse facility
located on 8.5 acres of land contiguous to properties we own in South Brunswick,
New Jersey. We acquired this property for $2.2 million by applying the balance
of a $1.6 million note receivable from the seller to the purchase price, issuing
50,476 Common Units in our Operating Partnership and using cash reserves for the
balance. This building will undergo redevelopment to convert the building into
Class A office space and upon completion will be 100% leased to AT&T Local
Services.

     On August 4, 1999, 372,295 of our Common Units were converted to Common
Shares.

     On August 12, 1999, we acquired an 89% ownership interest in three newly
constructed office buildings located in Harrisburg, Pennsylvania totaling
approximately 56,000 square feet. We acquired these buildings for $6.0
million from an entity owned by an officer and Trustee of ours. This
acquisition was financed by assuming a $4.3 million construction loan payable
with Mellon Bank, N.A. and using cash reserves for the balance. The
construction loan payable bears interest at a rate equal to the yield on
5-year Treasury securities plus 2.0%. The loan provides for monthly payments
of interest only through August 2000 and equal monthly payments of principal
and interest based on a 30-year amortization period commencing September
2000. The loan matures on August 1, 2005.

STATEMENT OF CASH FLOWS

     We generated net cash flow from operating activities of $15.9 million for
the six months ended June 30, 1999, an increase of $11.2 million from the six
months ended June 30, 1998. Our increase in cash flows from operating activities
is due mostly to income generated from our newly acquired properties. Our net
cash flow used in investing activities for the six months ended June 30, 1999
decreased $66.7 million from the six months ended June 30, 1998 due mostly to
the $38.5 million decrease in cash outlays associated with purchases of and

                                       24

<PAGE>

improvements to real estate properties during the period and $30.0 million in
proceeds generated from sales of our operating properties. Our net cash flow
provided by financing activities for the six months ended June 30, 1999
decreased $75.4 million from the six months ended June 30, 1998 due primarily to
$72.7 million from the issuance of Common Shares in the prior period, $42.1
million in additional repayments of mortgage loans payable and $6.6 million in
additional divided and distribution payments, offset by $45.7 million in
additional proceeds from mortgage loans payable.

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 six months ended June 30,
1999 and 1998 are summarized in the following table:






                                       25

<PAGE>

<TABLE>
<CAPTION>
                                                      (Dollars and shares for this table are in thousands)
                                                      ----------------------------------------------------
                                                        For the three months       For the six months
                                                            ended June 30,            ended June 30,
                                                        --------------------       ------------------
                                                          1999         1998         1999         1998
                                                        --------     --------     --------     --------
<S>                                                     <C>          <C>          <C>          <C>
Income before minority interests                        $  5,225     $  2,058     $ 10,813     $  2,548
Add: Nonrecurring charges - Reformation costs               --           --           --            637
Add:  Real estate related depreciation and
  amortization                                             2,872        1,270        5,646        2,241
Less: Preferred Unit distributions                          (853)        (853)      (1,706)      (1,706)
Less: Preferred Share dividends                             (338)        --           (676)        --
Less: Gain on sales of rental properties                    (154)        --         (1,140)        --
                                                        --------     --------     --------     --------
Funds from operations                                      6,752        2,475       12,937        3,720
Add: Preferred Unit distributions                            853          853        1,706        1,706
Add:  Preferred Share dividends                              338         --            676        --
                                                        --------     --------     --------     --------
Funds from operations assuming conversion of
  Preferred Units and Preferred Shares                     7,943        3,328       15,319        5,426

Less:  Straight line rent adjustments                       (825)        (384)      (1,500)        (743)
Less:  Recurring capital improvements                       (478)        --         (1,147)        --
                                                        --------     --------     --------     --------
Adjusted funds from operations assuming conversion
  of Preferred Units and Preferred Shares               $  6,640     $  2,944     $ 12,672     $  4,683
                                                        --------     --------     --------     --------
                                                        --------     --------     --------     --------
Weighted average Common Shares                            16,802        7,628       16,802        4,964
Conversion of Common Units                                 3,203        2,582        2,982        2,582
                                                        --------     --------     --------     --------
Weighted average Common Shares/Units                      20,005       10,210       19,784        7,546

Assumed conversion of share options                            9           21            9           21
Conversion of Preferred Shares                             1,845         --          1,845         --
Conversion of Preferred Units                              7,500        7,500        7,500        7,500
                                                        --------     --------     --------     --------
Weighted average Common Shares/Units assuming
  conversion of Preferred Units and Preferred Shares      29,359       17,731       29,138       15,067
                                                        --------     --------     --------     --------
                                                        --------     --------     --------     --------
</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 ensure compliance. This
testing process was originally scheduled to be completed in the second quarter
of 1999. However, due to an upgrade of the software package and the addition of
new modules in July 1999, the testing process was extended and is now estimated
to be completed in August 1999. Our accounting department has

                                       26

<PAGE>

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, including the telecommunication, security, energy
management, sprinkler and elevator systems. This evaluation process was
completed in the second quarter of 1999. Based on the results 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.
After contacting our significant suppliers regarding their Year 2000 readiness,
our property management team does not anticipate any material adverse
consequences relating to these suppliers abilities to support our properties.
Our property management team plans to continue its efforts to obtain additional
written assurance from material suppliers to support representations provided
regarding their Year 2000 readiness. Our team will also document in the third
quarter of 1999 our contingency plans in the unlikely event that certain
suppliers are adversely impacted by the Year 2000 Issue.

     We 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. To address this concern,
our property management team solicited responses from certain of our significant
tenants regarding their Year 2000 readiness. We also reviewed Year 2000
disclosures provided by certain of our significant tenants required to report to
the Securities and Exchange Commission. All tenants responding to our
solicitation were in the advanced stages of addressing the Year 2000 Issue; this
was also the case with all of the tenants included in our review of Year 2000
disclosures reported in filings by such tenants to the Securities and Exchange
Commission. The tenants included in our analysis represent 56% of our monthly
contractual base rents as of June 30, 1999 multiplied by 12 plus estimated
annualized expense reimbursements.

     Despite our efforts described above, given the nature of the Year 2000
Issue, there can be no assurance that we will be able to identify and correct
all possible aspects. However, based on all information available to us, we
believe that we have addressed all areas where the Year 2000 Issue could
materially impact our Company's business. 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.

                                       27

<PAGE>

     The following table sets forth our long-term debt obligations, principal
cash flows by scheduled maturity, weighted average interest rates and estimated
fair market value ("FMV") at June 30, 1999 (dollars in thousands):

<TABLE>
<CAPTION>
                                   For the Year Ended December 31,
                         ----------------------------------------------------
                           1999      2000(2)      2001       2002       2003   Thereafter     Total         FMV
                         --------   ---------   --------   --------   -------  ----------   ---------    ---------
<S>                      <C>        <C>         <C>        <C>        <C>       <C>         <C>          <C>
Long term debt:
Fixed rate(1)            $    798   $ 131,998   $  2,145   $  2,302   $ 2,472   $ 86,374    $ 226,089    $ 221,205
Average interest rate        7.41%       7.13%      7.29%      7.30%     7.30%      7.68%        7.55%
Variable rate            $ 10,173   $  57,199   $ 11,180   $ 11,797   $    44   $  1,697    $  92,090    $  92,090
Average interest rate        6.84%       6.88%      6.87%      7.67%     8.25%      8.25%        7.82%

</TABLE>

     (1)  Includes $30.0 million balance governed by a swap agreement which
          fixes the LIBOR rate on the underlying loan to 5.085%

     (2)  Includes $100.0 million maturity in October which may be extended for
          two one-year terms subject to certain conditions. Includes a $84.1
          million maturity in May, which may be extended for a one-year period
          subject to certain conditions.

     Based on our variable rate debt balances during the six months ended June
30, 1999, our interest expense would have increased $340,000 if interest rates
were 1% higher.

     On January 5, 1999, we entered into an interest rate swap agreement with
Deutsche Banc Alex. Brown 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 Deutsche Banc Alex. Brown 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).

ITEM 2.  CHANGES IN SECURITIES

a.   None

b.   None

c.   On April 16, 1999, we issued 326,768 Common Units in our Operating
Partnership in connection with the acquisition of the Parkway Crossing
Properties. 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.

     On April 28, 1999, we issued seven Common Units in our Operating
Partnership in connection with the acquisition of the Commons Corporate
Portfolio. 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

                                       28

<PAGE>

ITEM 4.   SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

<TABLE>
     <S>                                    <C>
     (a)  Meeting type and date             Annual Meeting of Shareholders held
                                            on May 19, 1999

     (b)  N/A

     (c)  Description of each matter
          voted on at meeting

          Resolution to amend our 1998     Results of votes
          Long Term Incentive Plan to       For                   12,173,149.975
          (i) increase the number of        Against or withheld      980,507.910
          issuable shares under the plan,   Abstentions and
          (ii) increase the number of        broker non-votes         45,685.000
          shares issuable to one plan
          participant and (iii) permit the
          issuance of restricted shares
</TABLE>

ITEM 5.   OTHER INFORMATION

     None

ITEM 6.   EXHIBITS AND REPORTS ON FORM 8-K

(a)  Exhibits:

<TABLE>
<CAPTION>

    EXHIBIT
       NO.                            DESCRIPTION
    -------     ----------------------------------------------------------------
    <S>         <C>
    2.1         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).
</TABLE>

                                       29

<PAGE>

<TABLE>
<CAPTION>

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

    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).

    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).
</TABLE>

                                       30

<PAGE>

<TABLE>
<CAPTION>

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

    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).

    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 (filed with the
                Company's Quarterly Report on Form 10-Q on May 14, 1999 and
                incorporated herein by reference).
</TABLE>

                                       31

<PAGE>

<TABLE>
<CAPTION>

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

    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, 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 (filed with the
                Company's Quarterly Report on Form 10-Q on May 14, 1999 and
                incorporated herein by reference).

    4.6         Articles Supplementary of Corporate Office Properties Trust
                Series B Convertible Preferred Shares, dated July 2, 1999 (filed
                with the Company's Current Report on Form 8-K on July 7, 1999
                and incorporated herein by reference).

    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).
</TABLE>

                                       32

<PAGE>

<TABLE>
<CAPTION>

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

    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).

    10.7.1      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).

    10.7.2      Amendment No. 1 to Corporate Office Properties Trust 1998 Long
                Term Incentive Plan.

    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, dated March 12, 1997, with respect to lot B
                (filed with the Registrant's Registration Statement on Form S-4
                (Commission File 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).
</TABLE>

                                       33

<PAGE>

<TABLE>
<CAPTION>

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

    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 Agreement, 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).

    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
</TABLE>

                                       34

<PAGE>

<TABLE>
<CAPTION>

    EXHIBIT
       NO.                            DESCRIPTION
    -------     ----------------------------------------------------------------
    <S>         <C>
                Office Management, Inc. (filed with the Company's Quarterly
                Report on Form 10-Q on May 14, 1999 and incorporated herein by
                reference).

    10.24.1     Lease Agreement, dated September 28,1998, between St. Barnabus
                Limited Partnership and Constellation Properties, Inc. (filed
                with the Company's Quarterly Report on Form 10-Q on May 14, 1999
                and incorporated herein by reference).

    10.24.2     First Amendment to Lease, dated December 31, 1998, between St.
                Barnabus, LLC and Constellation Properties, Inc. (filed with the
                Company's Quarterly Report on Form 10-Q on May 14, 1999 and
                incorporated herein by reference).

    10.25.1     Lease Agreement, dated August 3, 1998, between Constellation
                Real Estate, Inc. and Constellation Properties, Inc. (filed with
                the Company's Quarterly Report on Form 10-Q on May 14, 1999 and
                incorporated herein by reference).

    10.25.2     First Amendment to Lease, dated December 30, 1998, between Three
                Centre Park, LLC and Constellation Properties, Inc. (filed with
                the Company's Quarterly Report on Form 10-Q on May 14, 1999 and
                incorporated herein by reference).

    10.26.1     Lease Agreement, dated April 27, 1993, between Constellation
                Properties, Inc. and Baltimore Gas and Electric Company (filed
                with the Company's Quarterly Report on Form 10-Q on May 14, 1999
                and incorporated herein by reference).

    10.26.2     First Amendment to Lease, dated December 9, 1998, between COPT
                Brandon, LLC and Baltimore Gas and Electric Company (filed with
                the Company's Quarterly Report on Form 10-Q on May 14, 1999 and
                incorporated herein by reference).

    10.27       Underwriting Agreement, dated June 29, 1999, between Corporate
                Office Properties Trust and the underwriters of the Series B
                Preferred Shares (filed with the Company's Current Report on
                Form 8-K on July 7, 1999 and incorporated herein by reference).

    10.28       Contribution Rights Agreement, dated June 23, 1999, between the
                Operating Partnership and United Properties Group, Incorporated.

    27          Financial Data Schedule.
</TABLE>

                                       35

<PAGE>

c.   Reports on Form 8-K

We filed the following Current Reports on Form 8-K in the three months ended
June 30, 1999:

Item 5 dated June 14, 1999 in connection with the acquisition of the Commons
Corporate Portfolio and the probable transaction with United Properties Group,
Inc.

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: August 13, 1999              By: /s/ Randall M. Griffin
                                       ---------------------------------------
                                       Randall M. Griffin
                                       President and Chief Operating Officer

Date: August 13, 1999              By: /s/ Roger A. Waesche, Jr.
                                       ---------------------------------------
                                       Roger A. Waesche, Jr.
                                       Senior Vice President and Chief Financial
                                        Officer

                                       36


<PAGE>


                               AMENDMENT NO. 1 TO
                        CORPORATE OFFICE PROPERTIES TRUST
                          1998 LONG TERM INCENTIVE PLAN



1.       BACKGROUND.

This Amendment No. 1 is made and entered into as of the Effective Date set forth
below for the purpose of amending certain provisions of the 1998 Long Term
Incentive Plan (the "Plan") of Corporate Office Properties Trust (the
"Company"). Except as otherwise specifically set forth in this Amendment No. 1,
all terms and provision of the Plan shall remain in full force and effect.


2.       DEFINITIONS.

     A.  Section 2 of the Plan shall be amended by deleting subsection (b)
         thereof in its entirety and substituting the following therefor:

         (b) "Award" means any Option, Dividend Equivalent, or Restricted Shares
              granted to an Eligible Person under the Plan.

     B.  Section 2 of the Plan shall be amended by adding the following new
         subsection (v) immediately following subsection (u):

         (v) "Restricted Shares" means any Shares awarded under Section 5(d)
              that are subject to restrictions specified at the time of the
              Award.


3.       SHARES SUBJECT TO THE PLAN.

     A.  Section 4 of the Plan shall be amended by deleting subsections (a) and
         (b) thereof in their entirety and substituting the following:

         (a) Subject to adjustment as provided in Section 4(c) hereof, the total
             number of Shares reserved for issuance in connection with Awards
             under the Plan shall be 10% of the total of: (i) the number of
             issued and outstanding Shares at the time the Award is granted,
             plus (ii) the number of Shares which would be outstanding upon
             redemption of all operating partnership units or other securities
             of the Company which are convertible into Shares at the time the
             Award is granted and which have not yet been so redeemed;
             provided, however, that no more than 300,000 Shares shall be
             cumulatively available for Awards of ISOs hereunder and no more
             than 30% of the total number of Shares reserved for issuance
             hereunder shall be cumulatively available for Awards of
             Restricted Shares. No Award may be granted if the number of
             Shares to which such Award relates, when added to the number of
             Shares previously issued under the Plan, exceeds the number of
             Shares reserved under the



<PAGE>

             preceding sentence. If any Awards are forfeited, canceled,
             terminated, exchanged, or surrendered, or such Award is settled
             in cash or otherwise terminates without a distribution of Shares
             to the Participant, any Shares counted against the number of
             Shares reserved and available under the Plan with respect to
             such Award shall, to the extent of any such forfeiture,
             settlement, termination, cancellation, exchange, or surrender,
             again be available for Awards under the Plan. Upon the exercise
             of any Award granted in tandem with any other Awards, such
             related Awards shall be canceled to the extent of the number of
             Shares as to which the Award is exercised.

       (b)   Subject to adjustment as provided in Section 4(c) hereof, the
             maximum number of Shares with respect to which Options may be
             granted and the maximum number of Restricted Shares which may be
             awarded during a calendar year to any Eligible Person under this
             Plan shall be 300,000 Shares and 300,000 Restricted Shares.


4.       RESTRICTED SHARE AWARDS.

        A.  Section 5 of the Plan shall be amended by adding the following new
            subsection (d) immediately following subsection (c):

           (d)  RESTRICTED SHARES. The Board is authorized to grant Awards
                consisting of Restricted Shares to Eligible Persons, on the
                following terms and conditions:

                (i) AWARDS.  At the time of an Award of Restricted Shares, the
                    Board shall cause the company to deliver to the Participant,
                    or to a custodian or escrow agent designated by the Board, a
                    certificate or certificates for such Restricted Shares,
                    registered in the name of the Participant. The Participant
                    shall have all the rights of a stockholder with respect to
                    such Restricted Shares, subject to the terms and conditions,
                    including forfeiture or resale to the Company, if any, as
                    the Board may determine to be desirable pursuant to this
                    Section 5(d). The Board may designate the Company or one or
                    more of its executive officers to act as custodian or escrow
                    agent for the certificate(s).

               (ii) RESTRICTED SHARE AGREEMENT. A Participant granted an Award
                    of Restricted Shares shall not be deemed to have become a
                    stockholder of the Company, or to have any rights with
                    respect to such Restricted Shares (including the rights to
                    vote or to receive dividends), unless and until such
                    Participant shall have executed a Restricted Share
                    Agreement, a stock power endorsed in blank, or another
                    instrument evidencing the Award, in form and substance
                    satisfactory to the Board, and delivered a fully executed
                    copy thereof to the Company and otherwise complied with the
                    then applicable terms and conditions of such Award. The
                    terms and conditions of each such Restricted Share Agreement
                    shall be determined by the Board, and such terms and
                    conditions may differ among individual Awards and
                    Participants.


<PAGE>

               (iii)RESTRICTIONS. Restricted Shares awarded under this Plan may
                    not be sold, assigned, transferred, pledged, or otherwise
                    encumbered or disposed of, except as specifically provided
                    herein or in the Restricted Share Agreement. The Board at
                    the time of the Award shall specify the date or dates and/or
                    the attainment of performance goals, objectives, and other
                    conditions on which such restrictions and the Company's
                    right of repurchase or forfeiture shall lapse.

<PAGE>

               (iv) CERTIFICATE AND LEGEND. When an Award of Restricted Shares
                    is granted to a Participant, the Company shall issue a
                    certificate or certificates in respect of such Restricted
                    Shares, which shall be registered in the name of the
                    Participant and shall bear an appropriate legend referring
                    to the terms, conditions, and restrictions applicable to
                    such Award in substantially the following form:

                        "The transferability of the common shares of beneficial
                         interest represented by this certificate are subject to
                         the terms and conditions (including forfeiture) of a
                         Restricted Share Agreement entered into between the
                         registered owner and Corporate Office Properties Trust.
                         A copy of such agreement is on file in the offices of
                         the Secretary of the Company, (address)."

               (v) PAYMENT. Except as may be otherwise determined by the Board
                   (or as required in order to satisfy the tax withholding
                    obligations imposed under Section 8(c) of this Plan),
                    Participants granted Awards of Restricted Shares will not be
                    required to make any payment or provide any consideration to
                    the Company other than the rendering of their services.

               (vi) FORFEITURE. Subject to the provisions of subsection (vii) of
                    this Section 5(d), upon termination of the Participant's
                    employment for any reason prior to the expiration or other
                    termination of the restrictions described in subsection
                    (iii) of this Section 5(d), all Restricted Shares with
                    respect to which such restrictions have not yet expired or
                    been terminated shall be forfeited to the Company and may be
                    repurchased by the Company for a purchase price equal to the
                    original purchase price paid by the Participant for such
                    Restricted Shares.

               (vii) WAIVER OF RESTRICTIONS. In the event of a Participant's
                     normal retirement, permanent total disability, or death, or
                     in cases of special circumstances, the Board, in its sole
                     discretion, may waive in whole or in part any or all
                     remaining restrictions with respect to such Participant's
                     Restricted Shares.

B.       Section 7 of the Plan shall be amended by deleting subsection (a)
         thereof in its entirety and substituting the following therefor:

<PAGE>

        (a)   ACCELERATION OF EXERCISABILITY AND LAPSE OF RESTRICTIONS; CASH-OUT
              OF AWARDS. Unless otherwise provided by the Board at the time of
              the Award grant, all outstanding Awards pursuant to which the
              Participant may have rights the exercise of which is restricted or
              limited (including, but not limited to, restrictions upon the sale
              or transfer of Restricted Shares) shall become fully exercisable
              at the time of a Change of Control.


5.      EFFECTIVE DATE.

This Amendment No. 1 shall become effective upon its approval by shareholders of
the Company ("Effective Date").`

<PAGE>

                                                                   Exhibit 10-28

                          CONTRIBUTION RIGHTS AGREEMENT


         THIS CONTRIBUTION RIGHTS AGREEMENT (this "AGREEMENT") is made as of
this 23rd day of June, 1999, by and between CORPORATE OFFICE PROPERTIES, L.P.,
a Delaware limited partnership, having its principal office at 8815 Centre Park
Drive, Suite 400, Columbia, Maryland 31046-2372 ("COPLP"), and UNITED PROPERTIES
GROUP, INCORPORATED, a New York corporation, having an address at 305 W. Grand
Avenue, Suite 100, Montvale, New Jersey 07645 ("CONTRIBUTOR").

         WHEREAS, Contributor is the owner of one hundred percent (100%) of the
limited liability company member interests in 9690 Deereco Road LLC, a Maryland
limited liability company ("DEERECO"), which in turn owns in fee simple that
certain tract or parcel of land known as 9690 Deereco Road, Baltimore County,
Maryland, and more particularly described on EXHIBIT "A" attached hereto and
made a part hereof and the improvements and personal property (excluding
property owned by tenants) located thereon (the "DEERECO PROPERTY");

         WHEREAS, Contributor is the owner of one hundred percent (100%) of the
limited liability company member interests in Atrium Building LLC, a Maryland
limited liability company ("ATRIUM"), which in turn owns in fee simple that
certain tract or parcel of land known as 375 Padonia Road West, Baltimore
County, Maryland, and more particularly described on EXHIBIT "B" attached hereto
and made a part hereof and the improvements and personal property (excluding
property owned by tenants) located thereon (the "ATRIUM PROPERTY");

         WHEREAS, Contributor is the owner of one hundred percent (100%) of the
limited liability company member interests in Brown's Wharf, LLC, a Maryland
limited liability company ("BROWN'S WHARF"), which in turn owns in fee simple
those certain tracts or parcels of land known as 1615, 1625 and 1629 Thames
Street, Baltimore County, Maryland, and more particularly described on EXHIBIT
"C" attached hereto and made a part hereof and the improvements and personal
property (excluding property owned by tenants) located thereon (the "BROWN'S
WHARF PROPERTY")

         WHEREAS, Contributor desires to have the right to contribute, as a
whole, the limited liability company member interests in Deereco, Atrium and
Brown's Wharf (hereinafter referred to collectively, from time to time, as the
"PROPERTY" and described more particularly in the Contribution Agreement (as
hereinafter defined) as the "Contributed Interests") to COPLP or a successor
partnership, and COPLP is willing to grant such a right on the terms and
conditions set forth herein.

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


<PAGE>


         1.    DEFINITIONS.  For purposes of this Agreement, the capitalized
terms not expressly defined herein shall have the meaning established in the
Contribution Agreement.

         2.    CONTRIBUTION RIGHT; CONTRIBUTION CONSIDERATION. (a) At any time
on or before March 31, 2000 ("CONTRIBUTION DEADLINE"), Contributor shall have
the right (the "CONTRIBUTION RIGHT"), by written notice to COPLP, to contribute
all, but not less than all, of the Property (the "CONTRIBUTION") to COPLP (or to
a successor partnership). To exercise the Contribution Right, Contributor shall
deliver to COPLP written notice of its exercise of that right on or before the
Contribution Deadline. Within ten (10) days after the date upon which
Contributor shall have provided such written notice to COPLP, time being of the
essence, COPLP and Contributor shall execute a Contribution Agreement in the
form attached hereto as EXHIBIT "D" (the "CONTRIBUTION AGREEMENT"). Provided all
conditions precedent set forth in the Contribution Agreement are satisfied or
waived by the appropriate party thereto, the parties shall cause the
Contribution to be effected pursuant to the Contribution Agreement as soon as
reasonably practicable, but in no event sooner than fifteen (15) days after the
Contract Date or later than thirty (30) days after the Contract Date.

               (b)  In consideration of the contribution of the Property, and
subject to the terms of the Contribution Agreement, at the closing under the
Contribution Agreement, COPLP shall pay to Contributor a sum equal to the
aggregate undepreciated book value of the Projects (calculated by Contributor in
accordance with GAAP as of the Closing Date) (the "ASSET VALUE"). The Asset
Value shall be paid in the following manner:

                   (i)  COPLP shall issue Preferred Units, at the Preferred Unit
Price, having an aggregate value equal to the lesser of (a) the Asset Value less
the Assumed Indebtedness, or (b) $25,000,000 (as applicable, the "LP UNIT
AMOUNT"). In no event, however, shall the LP Unit Amount be less than
$23,861,633.30. The Preferred Units shall (1) entitle the holder to (A) a
preferred return, (B) designate a representative for election to the Board of
Trustees of COPT, (C) the registration rights set forth in the Registration
Rights Agreement, which appears as Exhibit 3 to the COPLP Partnership Agreement,
and (D) a liquidation preference, and (2) be convertible into 2.381 Common Units
in COPLP for each Preferred Unit, which, in turn, shall be redeemable in
accordance with Article 9 of the COPLP Partnership Agreement.

                   (ii)  Subject to (iii) below, COPLP shall assume the Assumed
Indebtedness (as such amount is updated on the Closing Date).

                   (iii) COPLP shall pay in cash to Contributor the balance of
the Asset Value (e.g., the amount determined by subtracting the LP Unit Amount
and the Assumed Indebtedness from the Asset Value) (the "CASH COMPONENT");
provided, however, that COPLP may, in its sole and absolute discretion, direct
Contributor to cause the Assumed Indebtedness to be paid off at the Closing, in
which case the Cash Component shall be increased by the amount of the Assumed
Indebtedness on the Closing Date. The Cash Component shall be further



                                       2
<PAGE>



adjusted by the positive or negative adjustments and prorations described in
Section 17 of the Contribution Agreement, all of which shall be adjusted as of
the Closing Date.

         3.    TOTAL LP UNIT AMOUNT. For purposes of determining the number of
Preferred Units to be issued in accordance with Section 2(b) of this Agreement,
the LP Unit Amount shall be divided by a Preferred Unit Price equal to $25.00.

         4.    ASSIGNMENT; TRANSFER OF PROPERTY. Neither Contributor nor COPLP
shall at any time sell, assign or transfer its interest in this Agreement or the
Contribution Agreement without the prior written consent of the other party;
provided, however, that COPLP shall have the right to transfer its interest
hereunder and under the Contribution Agreement to a successor partnership (if
any), but not otherwise.

         5.    CONTRIBUTOR REPRESENTATIONS, ACKNOWLEDGMENTS. (a) Contributor
represents and warrants to COPLP that it is an Accredited Investor as of the
date hereof and that it can and will comply with the related provisions of the
Contribution Agreement, including without limitation the provisions of Article 4
and Section 11.1.4 of the Contribution Agreement applicable to Contributor.

               (b)  Contributor acknowledges receipt of the informational
materials described in Section 4.2 of the Contribution Agreement and agrees
that, in connection with the execution of the Contribution Agreement (if the
Contribution Right is exercised), COPLP shall only be required to deliver those
materials described in clauses (iv) and (v) of Section 4.2 to the extent they
are issued on or after the date of this Agreement and prior to the Contract
Date.

         6.    LIMITED RECOURSE AGAINST COPLP AND CONTRIBUTOR. (a) No recourse
shall be had against any past, present or future trustee, shareholder, partner,
member, officer or employee of COPLP, COPT or their subsidiaries or affiliates
for any obligation of COPLP, COPT or such subsidiaries or affiliates under this
Agreement or under any document executed in connection herewith or pursuant
hereto, or for any claim based thereon or otherwise in respect thereof, whether
by virtue of any statute or rule of law, or by the enforcement of any assessment
or penalty or otherwise, all such liability being expressly waived and released
by Contributor and all parties claiming by, through or under Contributor.

                   (b) No recourse shall be had against any past, present or
future trustee, shareholder, partner, member, officer or employee of Contributor
or its subsidiaries or affiliates for any obligation of Contributor or such
subsidiaries or affiliates under this Agreement or under any document executed
in connection herewith or pursuant hereto, or for any claim based thereon or
otherwise in respect thereof, whether by virtue of any statute or rule of law,
or by the enforcement of any assessment or penalty or otherwise, all such
liability being expressly waived and released by COPLP and COPT and all parties
claiming by, through or under COPLP and COPT.



                                       3
<PAGE>



         6.    ENTIRE AGREEMENT. This Agreement (including the attached
Exhibits) contains the entire Agreement between the parties regarding the
subject matter hereof, and any agreement hereafter made shall not operate to
change, modify or discharge this Agreement in whole or in part unless such
agreement is in writing and signed by the party sought to be charged therewith.

         7.    NOTICES. To have any validity, notices or other communications
specifically referred to in this Agreement by either party to the other must be
in writing and must be given in the following manner: (a) in person, (b) by
certified mail, postage prepaid, return receipt requested, (c) by a commercial
overnight courier that guarantees next day delivery and requires a written
receipt, signed by the addressee, or (d) by legible facsimile with printed
confirmation of receipt (followed by hard copy delivered in accordance with
preceding subsections (a)-(c)). All notices or other communications properly
addressed and sent in accordance with this Section shall be deemed given or
served (1) upon delivery if delivered in person, (2) five (5) days after mailing
if sent by certified mail, (3) one (1) business day after mailing if sent by
reputable overnight courier, or (4) upon receipt if sent by confirmed facsimile.

         8.    GOVERNING LAW. This Agreement shall be construed and enforced in
accordance with the laws of the State of Maryland.

         9.    COUNTERPARTS. This Agreement may be executed in two or more
counterparts, and all such counterparts shall be deemed to constitute but one
and the same instrument.


                            [Execution Page Follows]



                                       4
<PAGE>



         IN WITNESS WHEREOF, COPLP and Contributor have executed this Agreement
the day and year first written above.


                                 CORPORATE OFFICE PROPERTIES, L.P., a
                                 Delaware limited partnership


                                 By:   CORPORATE OFFICE PROPERTIES TRUST, a
                                 Maryland Real Estate Investment Trust, its sole
                                 General Partner


                                       By: /s/ John Harris Gurley
                                          ------------------------------
                                       Name: John Harris Gurley
                                       Title: Vice President


                                 UNITED PROPERTIES GROUP, INCORPORATED, a
                                 New York corporation


                                 By: /s/ Joseph S. Thompson
                                    ---------------------------------------
                                 Name: Joseph S. Thompson
                                 Title: Vice President



                                       5
<PAGE>



                                   EXHIBIT "A"

                          DEERECO PROPERTY DESCRIPTION

                               See Following Page.


                                       A-1
<PAGE>



                                   EXHIBIT "B"

                           ATRIUM PROPERTY DESCRIPTION

                               See Following Page.



                                       B-1
<PAGE>



                                   EXHIBIT "C"

                       BROWN'S WHARF PROPERTY DESCRIPTION

                               See Following Page.



                                       C-1
<PAGE>


                                   EXHIBIT "D"

                         FORM OF CONTRIBUTION AGREEMENT

                               See Following Page.



                                       D-1
<PAGE>


                             CONTRIBUTION AGREEMENT

                                     Between

                             COPT ACQUISITIONS, INC.

                                       And

                      UNITED PROPERTIES GROUP, INCORPORATED




                      Dated as of ______________, ________



         IN MAKING AN INVESTMENT DECISION INVESTORS MUST RELY ON THEIR OWN
         EXAMINATION OF THE ISSUER 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>
<CAPTION>


                                TABLE OF CONTENTS

<S>      <C>                                                                 <C>
1.       DEFINITIONS..........................................................2

2.       CONTRIBUTION.........................................................7

3.       CONTRIBUTION CONSIDERATION...........................................8

4.       LP UNITS; INVESTOR MATERIALS.........................................9

5.       PARTNERSHIP LIABILITIES AND SALES OF REAL PROPERTY..................12

6.       CLOSING.............................................................16

7.       CONTRIBUTOR'S DELIVERIES............................................16

8.       PROJECT INSPECTION..................................................16

9.       TITLE AND SURVEY MATTERS............................................19

10.      REPRESENTATIONS AND WARRANTIES AS TO THE CONTRIBUTED
         INTERESTS AND THE REAL PROPERTY.....................................20

11.      REPRESENTATIONS AS TO SECURITIES AND RELATED MATTERS................23

12.      COVENANTS OF CONTRIBUTOR............................................25

13.      INTENTIONALLY OMITTED...............................................28

14.      ADDITIONAL CONDITIONS PRECEDENT TO CLOSING..........................28

15.      INTENTIONALLY OMITTED...............................................30

16.      CLOSING DELIVERIES..................................................30

17.      PRORATIONS AND ADJUSTMENTS..........................................33

18.      CLOSING EXPENSES....................................................34
</TABLE>



                                        i
<PAGE>

<TABLE>
<CAPTION>

<S>     <C>                                                                  <C>
19.      DESTRUCTION, LOSS OR DIMINUTION OF REAL PROPERTY....................34

20.      DEFAULT; INDEMNITY..................................................35

21.      SUCCESSORS AND ASSIGNS..............................................38

22.      LITIGATION..........................................................38

23.      NOTICES.............................................................39

24.      BENEFIT.............................................................40

25.      LIMITATION OF LIABILITY.............................................40

26.      BROKERAGE...........................................................40

27.      REASONABLE EFFORTS..................................................41

28.      MISCELLANEOUS.......................................................41
</TABLE>

<TABLE>
<CAPTION>

         LIST OF EXHIBITS                                     LIST OF SCHEDULES

<S>      <C>                                                  <C>      <C>                                                     <C>
A        Listing and Legal Description of the Projects        4.1.2    LP Units Schedule
B        Personal Property                                    5.2      Project Contacts
C        Investor Materials                                   10.6     Existing Violations
D        Contributor's Deliveries                             10.7     Existing Litigation
E        SEC Reporting Requirements                           10.9     Existing Tenant Default
F        Audit Representation Letter                                   Notices
G        Warrant Agreement                                    10.10    Contracts and Warranties
H        Amendment to Partnership Agreement                   10.12    Existing Environmental
                                                                       Matters
                                                              10.13    Assumed Indebtedness
                                                              11.1.4   Ownership Interests
                                                              12.4     Disclosed Unperformed
                                                                       Work
</TABLE>



                                       ii
<PAGE>



         THIS CONTRIBUTION AGREEMENT (this "AGREEMENT") is made and entered into
as of the ___ day of ______________, ________ (the "CONTRACT DATE"), by and
among UNITED PROPERTIES GROUP, INCORPORATED, a New York corporation
("CONTRIBUTOR"), the other parties, if any, identified on the signature page
hereto (collectively, together with Contributor, the "LP UNIT RECIPIENTS") and
COPT ACQUISITIONS, INC., a Delaware corporation ("ACQUIROR").

                                   BACKGROUND

         A.    Contributor is the owner of (i) one hundred percent (100%) of the
limited liability company member interests in 9690 Deereco Road LLC, a Maryland
limited liability company ("DEERECO"), (ii) one hundred percent (100%) of the
limited liability company member interests of Atrium Building LLC, a Maryland
limited liability company ("ATRIUM"), and (iii) one hundred percent (100%) of
the limited liability company member interests in Brown's Wharf, LLC, a Maryland
limited liability company ("BROWN'S WHARF"). Deereco, Atrium and Brown's Wharf
shall be referred to, from time to time, individually as an "OWNER" and
collectively as the "OWNERS". Each Owner is the record and beneficial owner of
its respective Project (as defined below) identified on EXHIBIT A.

         B.    Each Project includes that certain building (the "BUILDING"),
containing the number of rentable square feet identified on EXHIBIT A, and is
located at and known as the address set forth on EXHIBIT A. Each Building is
leased by its Owner to tenants ("TENANTS") for office purposes. In this
Agreement, the term "PROJECT" shall mean: (i) each parcel of land described on
EXHIBIT A attached hereto (the "LAND"), together with all rights, easements and
interests appurtenant thereto, including any streets or other public ways
adjacent to the Land and any water or mineral rights owned by, or leased to,
Contributor or Owner; (ii) all improvements located on the Land, including the
Building, and all other structures, systems, and utilities associated with, and
utilized by, Contributor or Owner in the ownership and operation of the Building
(all such improvements being collectively referred to herein as the
"IMPROVEMENTS"), but excluding improvements, if any, owned by Tenants; (iii) all
personal property of every nature and description owned by Contributor or Owner
(excluding Inventory (as defined below)) and either (A) located on or in the
Land or Improvements, or (B) used in connection with the operation and
maintenance of the Project (collectively, the "PERSONAL PROPERTY"), including
all (if any) personal property listed on EXHIBIT B attached hereto; (iv) all
building materials, supplies, hardware, carpeting and other inventory owned by
Contributor or Owner and maintained in connection with Contributor's or Owner's
ownership and operation of the Land and/or Improvements (collectively, the
"INVENTORY"); (v) all intangible property owned by Contributor or Owner used or
useful in connection with the foregoing including all trademarks, tradenames,
development rights, entitlements, contract rights, tenant improvement loans,
guarantees, licenses, permits and warranties (collectively, the "INTANGIBLE
PERSONAL PROPERTY");



                                        1
<PAGE>



and (vi) Contributor's or Owner's interest in all leases (including all
amendments and guarantees related thereto) and other agreements to occupy all or
any portion of the Land and/or Improvements in effect on the Contract Date or
into which such Contributor or Owner enters after the Contract Date but prior to
the Closing (as defined below) pursuant to the express terms of this Agreement
(collectively, the "LEASES").

         C.    Contributor and Acquiror desire to enter into this Agreement
relating to the contribution and conveyance of all of the limited liability
company member interests in Deereco, Atrium and Brown's Wharf (collectively, the
"CONTRIBUTED INTERESTS") in exchange for LP Units (as defined below) and, if
Acquiror so elects, the assumption of the Assumed Indebtedness (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.   "ACQUIROR" shall have the meaning set forth in the opening
paragraph of this Agreement.

               1.3.   "ACQUIROR INDEMNIFIED PARTY" shall have the meaning set
forth 20.3.1.

               1.4.   "ADVERSE TAX CONSEQUENCE" shall have the meaning set forth
in Section 5.3.2.

               1.5.   "AFFILIATE(S)" shall have the meaning set forth in Section
21.

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

               1.7.   "ASSET VALUE" shall have the meaning set forth in Section
3.1.


                                        2
<PAGE>



               1.8.   "ASSIGNED CONTRACTS" shall have the meaning set forth in
Section 16.1.4.

               1.9.   "ASSUMED INDEBTEDNESS" shall mean all of the indebtedness
of the Owners as of the Closing Date with respect to the Projects, the
outstanding principal balance of which (and other pertinent information) is
described on SCHEDULE 10.13 attached hereto, such indebtedness being the only
indebtedness that may, at Acquiror's election, be assumed by Acquiror in
connection with the transaction contemplated hereby. The Assumed Indebtedness is
evidenced and secured by the Existing Loan Documents.

               1.10.  "ATRIUM" shall have the meaning set forth in the recitals
to this Agreement.

               1.11.  "BROWN'S WHARF" shall have the meaning set forth in the
recitals to this Agreement.

               1.12.  "BUILDING" shall have the meaning set forth in the
recitals to this Agreement.

               1.13.  "CASH COMPONENT"shall have the meaning set forth in
Section 3.1.3.

               1.14.  "CLOSING" or "CLOSING DATE" shall have the meaning set
forth in Section 6 below.

               1.15.  "CLOSING STATEMENT" shall have the meaning set forth in
Section 16.1.12.

               1.16.  "CODE" shall have the meaning set forth in Section 5.3.1.

               1.17.  "COMMON UNITS" shall mean common units in the UPREIT.

               1.18.  "CONTRACT DATE" shall have the meaning set forth in the
opening paragraph to this Agreement.

               1.19.  "CONTRIBUTED INTERESTS" shall have the meaning set forth
in the recitals to this Agreement.

               1.20.  "CONTRIBUTION CONSIDERATION" shall have the meaning set
forth in Section 3.1.

               1.21.  "CONTRIBUTOR" shall have the meaning set forth in the
opening paragraph to this Agreement.


                                        3
<PAGE>



               1.22.  "CONTRIBUTOR'S DELIVERIES" shall have the meaning set
forth in Section 7.

               1.23.  "CONVERSION SHARES" shall have the meaning set forth in
Section 4.1.4.

               1.24.  "DAMAGE" shall have the meaning set forth in Section 19.

               1.25.  "DEERECO" shall have the meaning set forth in the recitals
to this Agreement.

               1.26.  "EMINENT DOMAIN" shall have the meaning set forth in
Section 19.

               1.27.  "EXCHANGE" shall have the meaning set forth in Section
5.4.

               1.28.  "EXISTING LOAN DOCUMENTS" shall mean the documents
evidencing or securing the Assumed Indebtedness, as described on SCHEDULE 10.13.

               1.29. "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 all or any portion of
any Project or the management, operation, use or improvement thereof.

               1.30.  "HAZARDOUS SUBSTANCE" shall have the meaning set forth in
Section 10.12 below.

               1.31.  "IMPROVEMENTS" shall have the meaning set forth in the
recitals to this Agreement.

               1.32.  "INFORMATIONAL MATERIALS" shall have the meaning set forth
in Section 11.1.4 below.

               1.33.  "INTEREST HOLDER(S)" shall mean any direct shareholders of
Contributor.

               1.34.  "INTANGIBLE PERSONAL PROPERTY" shall have the meaning set
forth in the recitals to this Agreement.

               1.35.  "INVESTOR MATERIALS" shall have the meaning set forth in
Section 4.1.3.

               1.36.  "INVENTORY" shall have the meaning set forth in the
recitals to this Agreement.


                                        4
<PAGE>



               1.37.  "LAND" shall have the meaning set forth in the recitals to
this Agreement.

               1.38.  "LEASES" shall have the meaning set forth in the recitals
to this Agreement.

               1.39.  "LENDER'S APPROVALS" shall have the meaning set forth in
Section 14.1.3.

               1.40.  "LOCK-UP PERIOD," as to the LP Units issued at the
Closing, shall mean the period equal to the longer of (a) one (1) year following
the Closing, and (b) the date on which a registration statement filed in respect
of such LP Units issued to the LP Unit Recipients pursuant to the Registration
Rights Agreement is declared effective. The foregoing notwithstanding, in no
event shall the Lock-Up Period extend more than two (2) years following Closing
hereunder.

               1.41.  "LOSSES" shall have the meaning set forth in Section
20.3.1.

               1.42.  "LP UNITS" shall mean the Common Units and the Preferred
Units collectively.

               1.43.  "LP UNIT AMOUNT" shall have the meaning set forth in
Section 3.1.1.

               1.44.  "LP UNIT RECIPIENTS" shall have the meaning set forth in
the opening paragraph to this Agreement.

               1.45.  "MAXIMUM AMOUNT" shall have the meaning set forth in
Section 5.1.2.

               1.46.  "NON-RECOGNITION CODE PROVISIONS" shall have the meaning
set forth in Section 5.1.1.

               1.47.  "NON-TAXABLE DISPOSITION PERIOD" shall mean the seven (7)
year period commencing on the Closing Date and ending on the seventh anniversary
of the Closing Date, as such period may be sooner terminated in accordance with
Section 5.

               1.48.  "OWNER(S)" shall have the meaning set forth in the
recitals to this Agreement.

               1.49.  "PARTNERSHIP AGREEMENT" shall mean the agreement of
limited partnership of the UPREIT, as amended from time to time prior to and
including the Contract Date.



                                        5
<PAGE>



               1.50.  "PERMITTED EXCEPTIONS" shall have the meaning set forth in
Section 9.1.

               1.51.  "PERSONAL PROPERTY" shall have the meaning set forth in
the recitals to this Agreement.

               1.52.  "PREFERRED UNITS" shall mean convertible preferred units
in the UPREIT.

               1.53.  "PREFERRED UNIT PRICE" shall mean $25.00.

               1.54.  "PROHIBITED EXCEPTIONS" shall have the meaning set forth
in Section 9.1.

               1.55.  "PROJECT" shall have the meaning set forth in the recitals
to this Agreement.

               1.56.  "PROJECT CONTACTS" shall mean the individuals or entitles
designated on SCHEDULE 5.2.

               1.57.  "RECORDS" shall mean all books, records, tax returns,
correspondence, financial data, leases, and all other documents and matters,
public or private, maintained by Contributor, the Owners or their agents,
relating to receipts and expenditures pertaining to any Owner or any Project for
the three most recent full calendar years (or such shorter time period as
Contributor shall have owned the Contributed Interests) and the current calendar
year and all contracts, rental agreements and all other documents and matters,
public or private, maintained by Contributor, the Owners or their agents,
relating to operations of any Project.

               1.58. "REGISTRATION RIGHTS AGREEMENT" shall mean the Registration
Rights Agreement dated March 16, 1998 (which is attached to the Partnership
Agreement as Exhibit 3), the benefits of which shall be conferred upon the LP
Unit Recipients at the Closing.

               1.59.  "REGULATORY VIOLATION NOTICE" shall have the meaning set
forth in Section 4.1.3.

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

               1.61.  "SCHEDULES" shall have the meaning set forth in Section
10.

               1.62.  "SEC" shall mean the Securities and Exchange Commission.

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



                                        6
<PAGE>



               1.64.  "SPOKESPERSON" shall have the meaning set forth in Section
5.3.2.

               1.65.  "TAX RELATED EVENT" and "TAX RELATED NOTICE" shall have
the meanings set forth in Section 5.3.1.

               1.66.  "TENANTS" shall have the meaning set forth in the recitals
to this Agreement.

               1.67.  "TITLE COMPANY" shall mean Chicago Title Insurance
Company.

               1.68.  "TITLE REPORT" shall have the meaning set forth in Section
9.2.

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

               References to this "Agreement" shall mean this Agreement,
including all amendments, modifications and supplements hereto and any exhibits
or schedules to any of the foregoing, and shall refer to this Agreement as the
same may be in effect at the time such reference becomes operative. The words
"herein," "hereof" and "hereunder" and other words of similar import refer to
this Agreement as a whole, including the exhibits and schedules hereto, as the
same may from time to time be amended, modified, restated or supplemented, and
not to any particular article, section, subsection or clause contained in this
Agreement. The term "including" shall be interpreted to mean "including without
limitation." Wherever from the context it appears appropriate, each term stated
in either the singular or plural shall include the singular and the plural, and
pronouns stated in the masculine, feminine or neuter gender shall include the
masculine, the feminine and the neuter.

         2.    CONTRIBUTION.

               2.1. ASSIGNMENT TO THE UPREIT. Immediately prior to the Closing,
Acquiror shall assign its entire right, title and interest in, to and under this
Agreement to the UPREIT, and the sole general partner of the UPREIT shall be the
REIT. Simultaneously with such assignment, the UPREIT shall assume all of
Acquiror's obligations and responsibilities under this Agreement.

               2.2. CONTRIBUTION. At the Closing, Contributor agrees to
contribute and convey to the UPREIT, and Acquiror agrees to cause the UPREIT to
accept and take from Contributor, on the terms and conditions set forth in this
Agreement, all of Contributor's right, title and interest in and to the
Contributed Interests.



                                        7
<PAGE>



         3.    CONTRIBUTION CONSIDERATION.

               3.1. PAYMENT OF CONTRIBUTION CONSIDERATION. In consideration of
the contribution of the Contributed Interests, and subject to the terms of this
Agreement, at the Closing, the UPREIT shall pay to Contributor a sum equal to
the aggregate undepreciated book value of the Projects (calculated by
Contributor in accordance with GAAP as of the Closing Date) (the "ASSET VALUE").
The Asset Value shall be paid in the following manner:

               3.1.1.   The UPREIT shall issue up to 1,000,000 Preferred Units,
at the Preferred Unit Price, having an aggregate value equal to the lesser of
(a) the Asset Value less the Assumed Indebtedness, or (b) $25,000,000
(as applicable, the "LP UNIT AMOUNT"). In no event, however, shall the LP Unit
Amount be less than $23,861,633.30.

               3.1.2.   Subject to Section 3.1.3 below, the UPREIT may, in its
sole and absolute discretion, assume the Assumed Indebtedness (as such amount is
updated on the Closing Date from the amount shown SCHEDULE 10.13).

               3.1.3.   The UPREIT shall pay in cash to Contributor the balance
of the Asset Value (e.g., the amount determined by subtracting the LP Unit
Amount and the Assumed Indebtedness from the Asset Value) (the "CASH
COMPONENT"); provided, however, that the UPREIT may, in its sole and absolute
discretion, direct Contributor to cause the Assumed Indebtedness to be paid off
at the Closing, in which case the Cash Component shall be increased by the
amount of the Assumed Indebtedness on the Closing Date. The Cash Component shall
be further adjusted by the positive or negative adjustments and prorations
described in Section 17 below, all of which shall be adjusted as of the Closing
Date.


         The payment of the Cash Component, the assumption of the Assumed
Indebtedness and the issuance of the LP Units described in this Section 3.1
shall be collectively referred to herein as the "CONTRIBUTION CONSIDERATION".

               3.2.   INTENTIONALLY OMITTED.

               3.3.   ASSUMPTION FEES, ETC. Contributor acknowledges and agrees
that Contributor shall be solely responsible for any and all fees and costs
imposed by the holder of the Assumed Indebtedness in connection with the
UPREIT's assumption of the Assumed Indebtedness (such as, but not limited to,
assumption fees, costs and expenses of the holder or servicer of the Existing
Loan Documents, etc.).

               3.4.   FRACTIONAL NUMBER OF LP UNITS.  If the above-described
calculation of Contribution Consideration would result in a fractional number of
LP Units to be delivered to



                                        8
<PAGE>



Contributor, the UPREIT shall round that fraction up or down, as the case may
be, to the nearest whole number of LP Units.

               3.5. PREFERRED UNITS. The Preferred Units shall be entitled to an
annual preferred return of (a) 9% for each of the ten (10) years following the
Closing Date, (b) 10.5% for each of the next five years, and (c) 12% for each
subsequent year, such preferred return to be paid, in each case, quarterly in
arrears. The Preferred Units shall be entitled to a liquidation preference of
$25.00 per unit, plus all accrued but unpaid dividends. The Preferred Units
shall be entitled to anti-dilution protection to the same extent as the Warrants
as set forth in the Warrant Agreement annexed as EXHIBIT G. Each of the
Preferred Units may be converted into 2.381 Common Units on or after the date
which is one (1) year after the date the Preferred Units are issued to an LP
Unit Recipient pursuant to this Agreement. The UPREIT shall have the right to
redeem for cash all outstanding Preferred Units after the tenth (10th)
anniversary of the Closing Date by giving the holder(s) thereof not less than
sixty (60) days' prior written notice.

               3.6. WARRANTS. On the Closing Date, the UPREIT shall issue to
Contributor ten-year detachable warrants exercisable for additional Common Units
pursuant to a warrant agreement in substantially the form of EXHIBIT G.

         4.    LP UNITS; INVESTOR MATERIALS.

               4.1.     LP UNITS GENERALLY.

                        4.1.1. Subject to Section 3.5 above, the Preferred Units
shall be convertible into Common Units and the Common Units shall be redeemable
for shares of common stock of the REIT or cash (or a combination thereof) in
accordance with the procedures described herein and in the Partnership
Agreement. Contributor acknowledges 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
substantially in the form of EXHIBIT H, which amendment shall be executed and
delivered by the REIT at the Closing (the "AMENDMENT").

                        4.1.2. Contributor hereby directs the UPREIT to deliver
the LP Units at the Closing issued in the names of, and for distribution to,
those LP Unit Recipients set forth on SCHEDULE 4.1.2 attached hereto. Each LP
Unit Recipient shall receive the number and type of LP Units set forth on said
Schedule.

                        4.1.3. Contributor has delivered to Acquiror, and has
caused its Interest Holders and any other LP Unit Recipient to deliver to
Acquiror, or to any other party designated



                                       9
<PAGE>



by Acquiror, a completed representation letter in substantially the form set
forth in EXHIBIT C attached hereto, providing, among other things, information
concerning each Contributor's, each Interest Holder's and each LP Unit
Recipient's status as an Accredited Investor. Contributor shall provide or cause
to be provided to Acquiror, or to any other party designated by Acquiror, such
other information and documentation as may reasonably be requested by Acquiror
in furtherance of the issuance of the LP Units as contemplated hereby (together
with the information provided on EXHIBIT C, the "INVESTOR MATERIALS").
Notwithstanding anything contained in this Agreement to the contrary, in the
event that, in the reasonable opinion of Acquiror, based on advice of its
securities counsel, (x) any such person or entity providing Investor Materials
is not considered an Accredited Investor, (y) the proposed issuance of LP Units
hereunder might not qualify for the exemption from the registration requirements
of Section 5 of the Securities Act, or (z) the proposed issuance of LP Units
hereunder would violate any applicable federal or state securities laws, rules
or regulations, any agreement to which the REIT or the UPREIT is privy, or any
tax related or other legal rules, agreements or constraints applicable to
Acquiror, the REIT or the UPREIT, Acquiror shall so advise Contributor, in
writing (the "REGULATORY VIOLATION NOTICE") within five (5) business days after
such determination is made. In the event a Regulatory Violation Notice is
delivered for the reason set forth in clause (x) above, the interest of each and
every person or other entity with respect to which Acquiror delivers a
Regulatory Violation Notice shall be redeemed by Contributor (or Contributor
shall otherwise cause such person or other entity to no longer have a direct or
indirect interest in Contributor), at no cost to any or all of Acquiror, the
REIT and the UPREIT, at least two business days prior to the Closing Date. In
the event of any such redemption, SCHEDULE 4.1.2 shall be revised to reflect the
updated list of LP Unit Recipients and the revised ownership percentages in the
Projects resulting from such redemption. In the event a Regulatory Violation
Notice is delivered for another reason, this Agreement shall terminate and no
party shall have any further liability hereunder except (i) as otherwise
expressly set forth in this Agreement and (ii) to the extent a breach of this
Agreement gives rise to, or becomes the basis for, the Regulatory Violation
Notice.

               4.1.4. Contributor hereby covenants and agrees that it shall
deliver or shall cause each of its partners, shareholders, members and any other
LP Unit Recipients to deliver to Acquiror, or to any other party designated by
Acquiror, 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 Acquiror, at such time as any LP
Units are redeemed for shares of common stock of the REIT ("CONVERSION SHARES").
The preceding covenant shall survive the Closing.

         4.2.  CERTAIN INFORMATIONAL MATERIALS. Contributor and the other LP
Unit Recipients hereby acknowledge and agree that the ownership of LP Units by
them and their respective rights and obligations as limited partners of the
UPREIT (including their right to



                                       10
<PAGE>



transfer, encumber, pledge and exchange 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, Contributor and each
of the other LP Unit Recipients hereby covenants and agrees that, at the
Closing, it shall execute any and all documentation reasonably required by the
UPREIT and the REIT to formally memorialize the foregoing. Contributor and each
of the other LP Unit Recipients acknowledges that it has received and reviewed,
prior to the Contract 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, 1998, (iv) all Form 10-Qs and Form 8-Ks that have been filed by the
REIT with the SEC since December 31, 1998, and (v) copies of all material press
releases, proxy statements and reports to shareholders issued since December 31,
1998, and has otherwise had an opportunity to conduct a due diligence review of
the affairs of the UPREIT and the REIT and has been afforded the opportunity to
ask questions of, and receive additional information from, the REIT regarding
the business, operations, conditions (financial or otherwise) and the current
prospects of the REIT and the UPREIT.

               4.3. LOCK-UP PERIOD. Each of the LP Unit Recipients agrees that
for the Lock-Up Period, it shall not, in any way or to any extent, redeem
(pursuant to the Partnership Agreement or otherwise), sell, transfer, assign,
pledge or encumber, or otherwise convey any or all of the LP Units delivered to
it in connection with this transaction and, if applicable, any Conversion
Shares.

               4.4. TRANSFER REQUIREMENTS. After the Lock-Up Period, each LP
Unit Recipient may only sell, transfer, assign, pledge or encumber, or otherwise
convey any or all of the LP Units delivered to it 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. The provisions of this Section 4.4 shall survive the
Closing.

               4.5. VOLUME RESTRICTION. From and after the expiration of the
Lock-Up Period, the aggregate amount of common stock of the REIT that the LP
Unit Recipient may sell (i) during any 10-trading day period shall not exceed 30
percent (30%) of the average of the daily trading volume of such stock (as
reported in The Wall Street Journal) for the thirty (30) trading days
immediately preceding the date on which the first sale of such stock during any
such 10-day period occurs, and (ii) during any calendar year shall not exceed
one-third of the Conversion Shares issuable upon redemption of the aggregate
amount of Common Units issued



                                       11
<PAGE>



(including those issued in connection with any conversion of Preferred Units) to
 such LP Unit Recipient at the Closing.

         5.    PARTNERSHIP LIABILITIES AND SALES OF REAL PROPERTY.

               5.1.   DISPOSITION OBLIGATIONS. Subject to this Section 5.1 and
the provisions of Section 5.2 hereof, the UPREIT shall use its good faith,
reasonable and diligent efforts:

                      5.1.1. Not to sell or otherwise voluntarily dispose of any
Project in a taxable transaction on or before the expiration of the Non-Taxable
Disposition Period unless such sale or other voluntary disposition (other than
through a deed in lieu of foreclosure, a foreclosure action, or an act of
eminent domain) of any Project (and all assets received in exchange for such
Project in which the REIT or the UPREIT has an adjusted tax basis substituted
from that of such Project) qualifies for non-recognition of gain under the Code
(for example, by means of exchanges contemplated under Code Sections 351, 354,
355, 368, 721, 1031 (but only if there is no "boot") or 1033), in such manner as
the Code provides from time to time (the "NON-RECOGNITION CODE PROVISIONS");
provided, however, that the foregoing shall not require the REIT and UPREIT, in
their sole and absolute discretion, to sell, or otherwise dispose of, or prevent
the REIT and UPREIT, in their sole and absolute discretion, from selling or
otherwise disposing of any Project in a transaction that would result in a loss
for federal income tax purposes;

                      5.1.2. To maintain, on a continuous basis, an amount of
indebtedness for which Contributor (including, for this purpose, the Interest
Holders in Contributor or transferees of Contributor, collectively) bears, or is
deemed to bear, the "economic risk of loss" within the meaning of Treasury
Regulation Section 1.752-2(a) (including through the use of guarantee
arrangements or arrangements providing for the imposition of a deficit
restoration obligation on Contributor pursuant to an amendment to the
Partnership Agreement) or which is allocated to Contributor pursuant to Treasury
Regulation Section 1.752-3(a) equal to not less than $3,000,000 (the "MAXIMUM
AMOUNT");

                      5.1.3. To avoid a distribution of property that would
cause Contributor to recognize income or gain pursuant to the provisions of
either or both of Code Sections 704(c)(1)(B) and 737;

                      5.1.4. To avoid a termination of the UPREIT pursuant to
the provisions of Code Section 708(b)(1)(B); and

                      5.1.5. As long as Contributor remains as a partner of the
UPREIT, the REIT and/or UPREIT agree to utilize the "traditional method,"
without curative allocations (as



                                       12
<PAGE>



contemplated for in the Partnership Agreement), of allocating gain and
depreciation under Code Section 704(c) for the Projects.

          The provisions of this Section 5.1 shall survive the Closing.

               5.2. LIMITATION ON DISPOSITION OBLIGATIONS. Notwithstanding
the provisions of Section 5.1, the obligation of the UPREIT to undertake those
activities set forth in Sections 5.1.1-5.1.4 hereof shall, in all events, be
subject to, and otherwise interpreted consistent with, the REIT's fiduciary and
statutory obligations to all partners (both present and future) in the UPREIT,
and to its stockholders, both present and future. Further, for purposes of this
Section 5 and except as otherwise provided in Section 5.3, the LP Unit
Recipients agree that neither the REIT nor the UPREIT shall be required to
obtain any approval, consent or waiver from, or take direction from, or
otherwise communicate with, any person or representative or entity concerning
any Project, other than those certain persons (the "PROJECT CONTACTS")
designated on SCHEDULE 5.2 attached hereto (and at the addresses set forth
therein). Notification of the Project Contacts for any Project shall constitute
sufficient and effective notification to all Interest Holders associated with
the applicable Project, and written communications from the Project Contacts for
such Project shall bind all Interest Holders associated with, related to, or
having an interest in, such Project. The provisions of this Section 5.2 shall
survive the Closing.

               5.3. NOTICE OF CERTAIN TRANSACTIONS.

                    5.3.1.  In the event, on or before the expiration of the
Non-Taxable Disposition Period, the UPREIT expects any of the following (each, a
"TAX-RELATED EVENT") to occur: (A) a post-Closing sale of any Project; (B) a
reduction in the amount of indebtedness allocable to Contributor (including, for
this purpose, the Interest Holders in Contributor, or transferees of
Contributor, collectively) in a manner consistent with Section 5.1.2 hereof, to
an amount that is less than the Maximum Amount (other than by regularly or other
scheduled principal payments); or (C) an attempt by the UPREIT to effect a
transfer of any Project as permitted by Section 5.1.1 above, but the terms of
Section 1031 of the Internal Revenue Code of 1986, as amended (the "CODE") or
the regulations promulgated thereunder have changed such that the mechanics for
implementing a tax-deferred exchange of real estate are materially and adversely
altered (whether with respect to the timing required to identify and close upon
an exchange property or otherwise) from those mechanics in place as of the
Contract Date, then the UPREIT shall give written notice of such Tax-Related
Event (a "TAX-RELATED NOTICE") to the Project Contacts as soon as practicable
after the occurrence of such event becomes reasonably likely, or, if later, on
the date on which the UPREIT is, in the reasonable judgment of its securities
counsel, legally permitted, under applicable federal and state securities laws
and regulations, and the rules and regulations of the New York Stock Exchange,
to disseminate such Tax-Related Notice to the Project Contacts.



                                       13
<PAGE>



              5.3.2. Upon their receipt of a Tax-Related Notice, the Project
Contacts shall designate a single spokesperson from among them to represent the
Interest Holders in connection with the Tax-Related Event that triggered the
delivery of such Tax-Related Notice (the "SPOKESPERSON"). Each LP Unit Recipient
hereby irrevocably appoints any Spokesperson so designated as their
attorney-in-fact, with full power to grant in the name of and on behalf of such
LP Unit Recipient, any and all consents, waivers, approvals, and to execute any
and all documents required or appropriate to be executed, whether with respect
to this Agreement, the Partnership Agreement or otherwise; provided, however,
that such attorney-in-fact may only act within the scope necessitated by the
Tax-Related Event giving rise to the appointment of such Spokesperson. The
UPREIT and the REIT shall be entitled to rely on the first written notice either
of them receives that designates a Spokesperson with respect to a given
Tax-Related Event, and shall be under no obligation to deal with any person
other than the Spokesperson so designated in connection with the subject
Tax-Related Event as it relates to any LP Unit Recipient. The UPREIT and the
REIT shall have no obligation to deal with any person or entity whatsoever in
connection with a Tax-Related Event unless and until a Spokesperson is properly
designated. The UPREIT and the REIT, and their respective independent
accountants, attorneys and other representatives and advisors, shall cooperate
with the Spokesperson in order to consider strategies proposed by or through the
Spokesperson (it being understood that neither the REIT nor the UPREIT shall
have any obligation whatsoever to propose any such strategies), on behalf of any
affected LP Unit Recipient, which strategies are designed or intended to defer
or mitigate any recognition of gain under the Code by any LP Unit Recipient or
any shareholder or partner in any LP Unit Recipient (any such gain recognition
being referred to herein as an "ADVERSE TAX CONSEQUENCE") that may result from a
Tax-Related Event, whether such strategies involve any or all of the LP Unit
Recipients (including Contributor) on a basis independent of the REIT and
UPREIT, or in conjunction with the REIT or the UPREIT. Each party shall pay its
own fees and expenses incurred in connection with the procedure delineated in
this Section 5.3.2. Under this Section 5.3.2, the UPREIT and the REIT are only
obligated to cooperate with the Spokesperson on behalf of any LP Unit Recipient
(or any partner, shareholder or member of any LP Unit Recipient) who may be
facing an Adverse Tax Consequence, in connection with such LP Unit Recipient's
determination of the efficacy of tax-deferral or tax-mitigation alternatives
proposed by or through the Spokesperson that may involve the REIT or the UPREIT.
In no event shall either the REIT or the UPREIT be required to incur any expense
(other than the cost of professional fees and expenses and administrative
expenses incurred in complying with this Section 5.3) in connection with its
cooperation under this Section 5.3, nor shall any transaction duly approved by
the Board of Directors of the REIT that results in a Tax-Related Event be
required to be suspended, postponed, impeded or otherwise adversely affected by
virtue of any potential Adverse Tax Consequence. The provisions of this Section
5.3 shall survive the Closing.



                                       14
<PAGE>



               5.4. 721 EXCHANGE. The parties acknowledge that Contributor
intends to treat the contribution and conveyance of the Contributed Interests in
exchange for LP Units (the "EXCHANGE") as a tax-free partnership contribution
pursuant to Section 721 of the Code. Acquiror, the UPREIT and the REIT shall
cooperate in all reasonable respects with Contributor to effectuate such
Exchange; provided, however, that:

               5.4.1. The Closing shall not be extended or delayed by reason of
such Exchange, unless Acquiror has breached its obligations to Contributor under
this Agreement;

               5.4.2. None of Acquiror, the UPREIT or the REIT shall be required
to incur any additional extraordinary (as opposed to a normal, customary and
recurring) cost or expense as a result of such Exchange, other than the cost of
Acquiror's counsel in connection with the preparation of this Agreement and the
other documents contemplated by this Agreement. Notwithstanding anything to the
contrary in the foregoing sentence, the UPREIT and the REIT shall be responsible
for costs associated with any IRS audit made directly of either or both of the
UPREIT and the REIT relating to their respective operations (as opposed to an
audit that is ancillary to an audit made of any or all of the entities
comprising Contributor). Contributor hereby covenants and agrees that it shall,
promptly on demand, reimburse Acquiror, the UPREIT or the REIT for any
additional extraordinary cost or expense (as opposed to a normal, customary and
recurring cost or expense, such as the analysis or computation related to the
manner in which depreciation and built-in gain are allocated amongst the LP Unit
Recipients), including reasonable attorneys' fees (e.g. those in excess of the
cost of Acquiror's counsel in connection with the preparation of this Agreement
and the other documents contemplated by this Agreement), actually incurred by
any or all of Acquiror, the UPREIT and the REIT (i) as a result of the
characterization of the contribution of the Projects pursuant to this Agreement
as a tax-free partnership contribution pursuant to Section 721 of the Code, or
(ii) which is directly attributable to the Exchange;

               5.4.3. Subject to the UPREIT's and the REIT's performance and
fulfillment in all material respects of the express covenants and conditions
contained in this Agreement, none of Acquiror, the UPREIT or the REIT warrant,
nor shall any of them be responsible for, the federal, state or local tax
consequences to Contributor, any or all of the Interest Holders and any or all
of the LP Unit Recipients resulting from either (i) the transactions
contemplated by this Agreement or (ii) the allocation, if any, of losses and
liabilities of the UPREIT to Contributor or any of the Interest Holders in
Contributor under the Partnership Agreement, the Code or Treasury Regulations
promulgated under the Code; and

               5.4.4. Except as otherwise expressly set forth in this Agreement
and in the documents executed and delivered by Acquiror at the Closing, none of
Acquiror, the



                                       15
<PAGE>



UPREIT nor the REIT shall incur any liability under any document or agreement
required to be executed or delivered in connection with such Exchange.

          The provisions of this Section 5.4 shall survive the Closing.

         6.    CLOSING. Except as otherwise provided in this Agreement, the
closing of the transaction contemplated by this Agreement (the "CLOSING") shall
take place on the date (the "CLOSING DATE") mutually agreed upon by the parties,
provided that the Closing Date shall occur no sooner than fifteen (15) days
after the Contract Date and no later than thrity (30) days after the Contract
Date. The Closing shall take place at the offices of Morgan, Lewis & Bockius
LLP, 1701 Market Street, Philadelphia, Pennsylvania 19103, at such other place
as may be mutually agreed upon by the parties, or in escrow at the offices of
the Title Company if mutually agreed upon by the parties.

         7.    CONTRIBUTOR'S DELIVERIES. Contributor shall cause each Project's
managing agent to make available to Acquiror, from and after the Contract Date,
at reasonable times and upon reasonable notice, all documents, contracts,
information, Records and exhibits that are in the possession of, or under the
control of, Contributor that are pertinent to the transaction that is the
subject of this Agreement, including without limitation the documents listed as
"Contributor's Deliveries" on EXHIBIT D attached hereto.

         8.    PROJECT INSPECTION.

               8.1. BASIC PROJECT INSPECTION. From and after the Contract Date,
at reasonable times and upon reasonable notice (subject to the Leases and the
rights of the Tenants), Acquiror, its agents and representatives shall be
entitled to conduct inspections of any Project, which will include the rights
to: (i) enter upon the Land and Improvements to perform inspections and tests of
any Project, including inspection, evaluation and testing of the heating,
ventilation and air-conditioning systems and all components thereof, all
structural and mechanical systems within the Improvements, including sprinkler
systems, power lines and panels, air lines and compressors, automatic doors,
tanks, pumps, plumbing and all equipment, vehicles, and Personal Property; (ii)
examine and copy any and all Records; (iii) make investigations with regard to
zoning, environmental (including an environmental assessment as specified in
Section 8.2, which includes, but is not limited to, an analysis of the presence
of any asbestos, chlordane, formaldehyde or other Hazardous Substance in, under
or upon any Project, or any underground storage tanks on, or under, the Land),
building, code, regulatory and other legal or governmental requirements; and
(iv) make or obtain market studies and real estate tax analyses. Without
limitation of the foregoing, Acquiror or its designated independent or other
accountants may audit the Financial Statements (as defined in EXHIBIT D attached
hereto), and





                                       16
<PAGE>



Contributor shall supply such documentation as Acquiror or its accountants may
reasonably request in order to complete such audit.

               8.2.   ENVIRONMENTAL ASSESSMENT.  From and after the Contract
Date, at reasonable times and upon reasonable notice (subject to the Leases and
the rights of the Tenants), Acquiror or Acquiror's agent(s) shall have the right
to employ one or more environmental consultants or other professional(s) to
perform or complete such environmental inspections and assessments of any
Project as Acquiror deems necessary or desirable; provided, however, that
Acquiror shall not perform a "Phase II" environmental assessment or undertake
any other invasive physical tests at any Project without first obtaining
Contributor's approval to do so, which approval shall not be unreasonably
withheld or delayed; and provided further that prior to any such entry onto any
Project, Acquiror and its agent(s) shall furnish to Contributor certificates of
insurance for such coverage and in such amounts and with such carriers as shall
be reasonably acceptable to Contributor. Acquiror and its consultants shall also
have the right to undertake or complete a technical review of all documentation,
reports, plans, studies and information in possession or control of Contributor,
or its past or present environmental consultants, concerning or in any way
related to the environmental condition of any Project. In order to facilitate
the assessments and technical review, at reasonable times and upon reasonable
notice (subject to the Leases and the rights of the Tenants), Contributor shall
extend its reasonable cooperation (but without third party expense to
Contributor) to Acquiror and its environmental consultants, including providing
access to all files and fully and completely answering all questions (to the
best of its knowledge).

               8.3.   ACQUIROR'S UNDERTAKING. Acquiror hereby covenants and
agrees that it shall cause all studies, investigations and inspections performed
at any Project pursuant to this Section 8 to be performed in a manner that does
not materially or unreasonably disturb or disrupt the tenancies at or business
operations of any Project. In the event that, as a result of Acquiror's exercise
of its rights under Sections 8.1 and 8.2, physical damage occurs to any Project,
then Acquiror shall promptly repair such damage, at Acquiror's sole cost and
expense, so as to return the applicable Project to substantially the same
condition as exists on the Contract Date. Acquiror hereby indemnifies, protects,
defends and holds Contributor harmless from and against any and all losses,
damages, claims, causes of action, judgments, damages, costs and expenses that
Contributor actually suffers or incurs as a direct result of any physical damage
caused to, in, or at any Project during the course of, or as a result of, any or
all of the studies, investigations and inspections that Acquiror elects to
perform (or causes to be performed) pursuant to this Section 8.

               8.4.   CONFIDENTIALITY. Each party agrees to maintain in
confidence, and not to disclose to any Tenant or its employees, the information
contained in this Agreement or pertaining to the transaction contemplated hereby
and the information and data furnished or



                                       17
<PAGE>



made available by Contributor to Acquiror, its agents and representatives in
connection with Acquiror's investigation of any Project and the transactions
contemplated by this Agreement; provided, however, that each party, its agents
and representatives may disclose such information and data (i) to such party's
accountants, attorneys, existing or prospective lenders, investment bankers,
accountants, underwriters, ratings agencies, partners, shareholders, consultants
and other advisors in connection with the transactions contemplated by this
Agreement to the extent that such representatives reasonably need to know (in
the disclosing party's reasonable discretion) such information and data in order
to assist, and perform services on behalf of, the disclosing party; (ii) to the
extent required by or appropriate under any applicable statute, law, regulation
or Governmental Authority (including the requirement to prepare and file Form
8-K and other reports and filings required by the SEC and other regulatory
entities, as described in EXHIBIT E attached hereto) or by the New York Stock
Exchange in connection with the listing of the Conversion Shares; (iii) in
connection with any litigation that may arise between the parties in connection
with the transactions contemplated by this Agreement or otherwise relating to
any Project or any of them; (iv) to the extent such disclosure is required or
appropriate in connection with any securities offering or other capital markets
or financing transaction undertaken by the REIT; (v) to the extent such
information and data become generally available to the public other than as a
result of disclosure by the disclosing party or its agents or representatives;
(vi) to the extent such information and data become available to the disclosing
party or its agents or representatives from a third party who, insofar as is
known to the disclosing party, is not subject to a confidentiality obligation to
the other party hereunder; and (vii) to the extent necessary in order to comply
with each party's respective covenants, agreements and obligations under this
Agreement. In the event the transactions contemplated by this Agreement shall
not be consummated, such confidentiality shall be maintained indefinitely.
Furthermore, Contributor and Acquiror acknowledge that, notwithstanding any
contrary term of this Section 8.4, Acquiror shall have the right to issue a
press release upon the execution and delivery of this Agreement and the
consummation of the transactions contemplated hereby, and Contributor shall have
the right to disclose this Agreement to Contributor's parent, who may disclose
it to its shareholders.

         9.    TITLE AND SURVEY MATTERS

               9.1.   TITLE. At the Closing, each Owner's title to the Projects
shall be free and clear of any mortgage liens, judgments and security interests,
except the Assumed Indebtedness if Acquiror elects to assume the same
("PROHIBITED EXCEPTIONS"). Acquiror acknowledges and agrees, however, that
Acquiror has agreed to accept the Contributed Interests and title to the
Projects subject to any and all covenants, restrictions, easements, rights of
way, Leases and other encumbrances and all encroachments and boundary disputes,
if there be any, excepting only Prohibited Exceptions, as aforesaid (all such
permitted title exceptions shall be the "PERMITTED EXCEPTIONS"). Acquiror shall
promptly cause Title Company to issue and deliver to Contributor a title
insurance report ("TITLE REPORT") for each of the Projects. If the Title Report
contains





                                       18
<PAGE>



any Prohibited Exceptions, Contributor agrees to take the necessary steps to
remove such matters from record title to the Projects. In the event Contributor
fails to remove any or all of the Prohibited Exceptions prior to Closing,
Acquiror shall have the rights contained in Section 9.4. Any expenses incurred
in obtaining the Title Report (including, without limitation, expenses incurred
by an attorney in conducting the necessary title search) shall solely be borne
by Acquiror.  The title insurance premium for the title policy (inclusive of
Acquiror's requested endorsements) shall also be solely borne by Acquiror.

               9.2. Notwithstanding anything to the contrary that may be stated
herein, excluding mortgage liens, judgments, security interests or other
encumbrances that were intended to be discharged of record upon Contributor's
acquisition, no mortgage lien, judgment, security interest or other encumbrance
in existence immediately preceding Contributor's acquisition of the Contributed
Interests, shall constitute a "Prohibited Encumbrance".

               9.3.  INTENTIONALLY OMITTED.

               9.4.  FAILURE REGARDING TITLE. In the event that as of Closing,
title to the Projects shall be other than in accordance with the provisions of
this Agreement, then Acquiror shall have the option, exercisable by written
notice to Contributor at or prior to Closing, of (1) accepting at Closing such
title as Contributor is able to convey and waiving any unsatisfied condition
precedent, with no deduction from or adjustment of the Purchase Price, except to
the extent of liens of a fixed or ascertainable amount not exceeding the Cash
Component, unless the lien was created voluntarily by Contributor, or (2)
declining to proceed to Closing. In the latter event, except as expressly set
forth herein, all obligations, liabilities and rights of the parties under this
Agreement shall terminate.

         10.   REPRESENTATIONS AND WARRANTIES AS TO THE CONTRIBUTED INTERESTS
AND THE REAL PROPERTY. Except (a) as otherwise set forth in the written
schedules attached to this Agreement (the "SCHEDULES") which set forth the
exceptions to the representations and warranties contained in this Section 10
and certain other information called for by this Agreement (unless otherwise
specified, (i) each reference in this Agreement to any numbered schedule is a
reference to that numbered schedule which is included in the Schedules and (ii)
no disclosure made in any particular numbered schedule of the Schedules shall be
deemed made in any other numbered schedule of the Schedules unless expressly
made therein (by cross-reference or otherwise)), and (b) as disclosed in any
document delivered to Acquiror by Contributor or by any other information
discovered by or known to Acquiror or disclosed in writing to Acquiror by
Contributor prior to the Closing, Contributor, for itself and each of the
Owners, represents and warrants to Acquiror that the following matters are true
and correct as of the Contract Date and shall be true and correct as of the
Closing Date:



                                       19
<PAGE>



         10.1. CONTRIBUTOR'S AUTHORITY. Contributor is a corporation duly
organized and validly existing and in good standing under the laws of the State
of New York and has all requisite power and authority to enter into this
Agreement and perform its obligations hereunder and to carry on its business as
now conducted and to control the ownership, leasing and operation of the
Projects.

         10.2. OWNER'S AUTHORITY. Each Owner is a limited liability company duly
organized, validly existing and in good standing under the laws of the State of
Maryland and has all requisite power and authority to carry on its business as
now conducted and to own, lease and operate its properties and assets now owned
or leased or operated by it. To the best of Contributor's actual knowledge, no
Project is encumbered by any mortgages, collateral or conditional assignments,
pledges, hypothecations, security interests and other encumbrances (except for
the Assumed Indebtedness), and each Owner holds good and marketable title to its
Project.

         10.3. OWNERSHIP. Contributor holds one hundred percent (100%) of the
membership interests in each of the Owners, free and clear of all mortgages,
collateral or conditional assignments, pledges, hypothecations, security
interests and other encumbrances (except for the Assumed Indebtedness). Each
Owner, in turn, holds fee simple title to its Project, free and clear of any
Prohibited Exceptions.

         10.4. NO CONFLICT. To the best of Contributor's actual knowledge, the
execution and delivery of this Agreement and the consummation of the
transactions contemplated hereunder on the part of Contributor do not and will
not conflict with or result in the breach of any material terms or provisions
of, or constitute a default under, or result in the creation or imposition of
any lien, charge, or encumbrance upon, any of the Contributed Interests or other
assets of Contributor or upon the Projects by reason of the terms of any
contract, mortgage, lien, lease, agreement, indenture, instrument or judgment to
which Contributor or any Owner is a party or which is or purports to be binding
upon Contributor or any Owner or which otherwise affects Contributor or any
Owner, which will not be discharged, assumed or released at Closing.

         10.5. NO CONDEMNATION. To the best of Contributor's actual knowledge,
no Owner has received any written notice of any pending or contemplated
condemnation, eminent domain or similar proceeding with respect to all or any
portion of its Project.

         10.6. COMPLIANCE. Except as set forth in SCHEDULE 10.6, to the
best of Contributor's actual knowledge, no Owner has received written notice of
any existing violations



                                       20
<PAGE>



of any federal, state, county or municipal laws, ordinances, orders, codes,
regulations, or requirements affecting its Project which have not been cured.

         10.7. LITIGATION. Except as set forth in SCHEDULE 10.7, to the best of
Contributor's actual knowledge, there is no material action, suit or proceeding
pending or threatened against the Projects, or arising out of the ownership,
management or operation of the Projects, this Agreement or the transactions
contemplated hereby.

         10.8.    FIRPTA.  Contributor is not a "foreign person" as defined in
Section 1445(f)(3) of the Internal Revenue Code.

         10.9. LEASES. There are no leases or occupancy agreements currently in
effect which affect the Projects other than the Leases listed on the Rent Roll
(as defined on EXHIBIT D), and to the best of Contributor's actual knowledge,
Contributor has paid in full all expenses connected with the negotiation,
execution and delivery of the Leases which are due and owing as of the Agreement
Date, including without limitation brokers' commissions, leasing fees and
recording fees (but excluding (i) any such commissions or fees, if any,
attributable to the term of the relevant Lease from and after the date of
Closing, (ii) any such commissions or fees, if any, attributable to extension,
renewal or expansion options executed after the date of Closing and (iii) any
tenant improvement allowance or credit which is not yet due and payable). No
Owner has received from any of its Tenants any written notices alleging any
breach or default by such Owner, as landlord, which remain uncured as of the
Contract Date, and no Owner has delivered to any of its Tenants written notices
alleging any breach or default by such Tenants which remain uncured as of the
Contract Date, except as set forth in SCHEDULE 10.9.

         10.10. CONTRACTS. There are no construction, management, leasing,
service, equipment, supply, maintenance or concession agreements in effect with
respect to the Projects other than those Contracts (as defined in EXHIBIT D) set
forth on SCHEDULE 10.10. No Owner has received from any contracting parties
under the Contracts any written notices alleging any breach or default by such
Owner which remain uncured as of the Contract Date, and no Owner has delivered
to such contracting parties written notices alleging any breach or default by
such contracting parties which remain uncured as of the Contract Date, except as
set forth in SCHEDULE 10.10.

         10.11. WARRANTIES. There are no guaranties or warranties relating to
the design or construction of the Improvements or the installation, use or
repair of any Personal Property other than those Warranties set forth in
SCHEDULE 10.11.

         10.12. ENVIRONMENTAL MATTERS.  To the best of Contributor's actual
knowledge, except as set forth in SCHEDULE 10.12:



                                       21
<PAGE>



                      (a)   There has not been placed or located on any of the
Projects by Contributor or any Owner, and there will not be placed or located on
any of the Projects prior to Closing by Contributor or any Owner, any Hazardous
Substance (as used herein, "HAZARDOUS SUBSTANCE" means any substance deemed
hazardous, toxic or dangerous, or other substance required to be disclosed,
reported, treated, removed, disposed of or cleaned-up by any applicable federal,
state or local law, ordinance, code or regulation in effect on the date hereof,
and includes, without limitation, lead paint, polychlorinated biphenyls,
petroleum-based products and asbestos); and

                      (b)   There has not been manufactured, stored or deposited
by Contributor or any Owner on any of the Projects, any Hazardous Substance, and
neither Contributor nor any Owner has received written notice of any proceeding
or inquiry by any governmental authority with respect to the possible presence
of any Hazardous Substance on any of the Projects, including the migration of
any Hazardous Substances onto any of the Projects.

         10.13.  EXISTING LOAN DOCUMENTS. SCHEDULE 10.13 attached hereto sets
forth a true, correct and complete listing of all of the promissory notes,
mortgages and other loan documents evidencing or securing the Assumed
Indebtedness (the "EXISTING LOAN DOCUMENTS"), and Contributor has delivered
true, correct and complete copies of the Existing Loan Documents to Acquiror
prior to the date hereof as part of Contributor's Deliveries. Contributor has
complied with (and, prior to the Closing, shall continue to comply with) the
terms of, and all notices or correspondence received from the holder of the
Existing Loan Documents. Contributor has paid (and, at all times prior to the
Closing, shall pay) all sums due under the Existing Loan Documents. The Existing
Loan Documents are in full force and effect. Contributor is not in default under
the Existing Loan Documents beyond any applicable notice, grace or cure period,
and there has not occurred any event which, with the giving of notice and/or the
passage of time, or both, would constitute a default by Contributor thereunder.
The outstanding principal amount of the Assumed Indebtedness is accurately set
forth on SCHEDULE 10.13. Following Acquiror's assumption thereof, Acquiror will
be entitled to prepay the Assumed Indebtedness by the payment of the outstanding
principal amount and the accrued interest as of the date of prepayment without
premium or penalty, or any fees and expenses due to the holder or servicer of
the Assumed Indebtedness.

         10.14. Notwithstanding anything to the contrary that may be stated
herein, Acquiror may not invoke as a failure of a condition precedent to
Acquiror's obligation to close hereunder, the inaccuracy of a representation or
warranty of Contributor if the inaccuracy derives directly from a specific fact
or circumstance actually known to Acquiror prior to the date hereof which was in
existence on or prior to the date Contributor acquired the Contributed Assets.



                                       22
<PAGE>



         11.   REPRESENTATIONS AS TO SECURITIES AND RELATED MATTERS.

               11.1. CONTRIBUTOR AND LP UNIT RECIPIENTS. Contributor represents
and warrants to Acquiror that the following matters are true and correct as of
the Contract Date and shall be true and correct as of the Closing Date; and each
LP Unit Recipient represents and warrants (but only as to itself) to Acquiror
that the matters set forth in Sections 11.1.1 and 11.1.4 are true and correct as
of the Contract Date and shall be true and correct as of the Closing Date and
covenant as follows:

                      11.1.1.          Intentionally Omitted.

                      11.1.2.          Intentionally Omitted.

                      11.1.3.          Intentionally Omitted.

                      11.1.4.          Each LP Unit Recipient represents that
its LP Units are being acquired by it with the present intention of holding such
LP Units for purposes of investment, and not with a view towards sale or any
other distribution. Each LP Unit Recipient recognizes that it may be required to
bear the economic risk of an investment in the LP Units for an indefinite period
of time. Contributor and each LP Unit Recipient is an Accredited Investor.
Contributor and each LP Unit Recipient has 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 is other than an Accredited
Investor with respect to whom there has been delivered to Acquiror satisfactory
Investor Materials confirming the status of such person or entity as an
Accredited Investor. Each LP Unit Recipient has been furnished with the
informational materials described in Section 4.2 above (collectively, the
"INFORMATIONAL MATERIALS"), and has read and reviewed the Informational
Materials and understands the contents thereof. The LP Unit Recipients 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 the REIT. The LP Unit Recipients 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, Acquiror, the UPREIT, the REIT or any of
their officers, directors, affiliates or professional advisors for such advice
as to such consequences. Each of Contributor and its Interest Holders is an
Accredited Investor under Regulation D promulgated under the Securities Act of
1933, as amended. No Contributor or LP Unit Recipient requires the consent of
any Interest Holder in order to consummate the transactions contemplated by this
Agreement, including to amend any partnership agreement, operating agreement,
charter or other governing document of Contributor or any LP Unit Recipient.
SCHEDULE 11.1.4 accurately



                                       23
<PAGE>



sets forth (a) the direct ownership interest of Contributor and each LP Unit
Recipient, and (b) the residence or, in the case of non-individual LP Unit
Recipient or Contributor, state in which it was formed.

         11.2. ACQUIROR. Acquiror represents and warrants to Contributor that
the following matters are true and correct as of the Contract Date and shall be
true and correct as of the Closing Date:

               11.2.1.  The UPREIT is a limited partnership duly authorized and
validly existing under Delaware law. The performance of this Agreement by the
UPREIT has been duly authorized by the REIT in accordance with the Partnership
Agreement, and, upon the assignment of this Agreement to the UPREIT, this
Agreement will be binding on the UPREIT and enforceable against it in accordance
with its terms. The UPREIT has been at all times, and presently intends to
continue to be, classified as a partnership or a publicly traded partnership
taxable as a partnership for federal income tax purposes and not an association
taxable as a corporation or a publicly traded partnership taxable as a
corporation.

               11.2.2.  Acquiror is a corporation duly authorized and validly
existing under Delaware law. The execution and delivery of this Agreement by
Acquiror, and the performance of this Agreement by Acquiror, has been duly
authorized by Acquiror, and this Agreement is binding on Acquiror and
enforceable against it in accordance with its terms. No consent of any creditor,
investor, partner, shareholder, judicial or administrative body, Governmental
Authority, or other governmental body or agency, or other party to such
execution, delivery and performance by Acquiror is required. 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 Acquiror is a party or by which Acquiror
is bound; or (ii) violate any restriction, court order, agreement or other legal
obligation to which Acquiror is subject.

               11.2.3. The REIT is a real estate investment trust duly
authorized and validly existing under Maryland law. The performance of this
Agreement by the REIT, as general partner of the UPREIT, has been duly
authorized by the REIT, and this Agreement is binding on the REIT, as general
partner of the UPREIT, and enforceable against it, as general partner of the
UPREIT, in accordance with its terms.

               11.2.4. LITIGATION. To the best of Acquiror's actual knowledge,
there is no material action, suit or proceeding pending or threatened against
Acquiror, the UPREIT or the REIT which is expected to have a material adverse
affect on Acquiror, the UPREIT or the REIT, or impair the ability of Acquiror to
complete the transactions contemplated hereby.



                                       24
<PAGE>



         12. COVENANTS OF CONTRIBUTOR. Effective from the execution of this
Agreement until the Closing or termination of this Agreement, Contributor, for
itself and each Owner, hereby covenants with Acquiror as follows:

         12.1. LEASES. No Owner shall amend in any material respect or terminate
any Lease, nor shall any Owner execute any new lease, license, or other
agreement affecting the ownership or operation of all or any portion of any
Project or for personal property, equipment, or vehicles, without in each case
Acquiror's prior written approval, which approval shall not be unreasonably
withheld or delayed.

         12.2. NEW CONTRACTS. No Owner shall enter into any contract with
respect to the ownership and operation of all or any portion of any Project that
will survive the Closing, or that would otherwise affect the use, operation or
enjoyment of the applicable Project, without Acquiror's prior written approval,
which approval may granted or denied in Acquiror's reasonable discretion, except
for service contracts entered into in the ordinary course of business that are
terminable, without charge or penalty, on not more than 30 days' notice, for
which no approval shall be required.

         12.3. OPERATION OF PROJECT. Each Owner shall operate and manage its
Project in the same manner as presently operated and managed, maintaining
present services (including pest control), and shall maintain the Project in its
present repair and order, normal wear and tear excepted; shall keep on hand
sufficient materials, supplies, equipment and other Personal Property for the
efficient operation and management of the Project in its present manner; and
shall perform, when due, all of its obligations under the Existing Loan
Documents, Leases, Contracts, Governmental Approvals (as defined on EXHIBIT D)
and other agreements relating to the Project and otherwise in accordance with
applicable laws, ordinances, rules and regulations affecting the Project. None
of the Personal Property, fixtures or Inventory shall be removed from any
Project, unless replaced by personal property, fixtures or inventory of equal or
greater utility and value.

         12.4. PRE-CLOSING EXPENSES. Each Owner has paid or will pay or cause
to be paid in full, prior to the Closing, all bills and invoices received prior
to the Closing Date for labor, goods, material and services of any kind relating
to its Project and utility charges for the period prior to the Closing.
Contributor shall pay to Acquiror promptly upon demand all bills and invoices
received after the Closing Date for labor, goods, material and services of any
kind relating to any Project and utility charges for the period prior to the
Closing. Except as disclosed in SCHEDULE 12.4, any alterations, installations,
decorations and other work required to be performed on or prior to the Closing
under any and all agreements affecting any Project have been or will, by the
Closing, be completed and paid for in full.



                                       25
<PAGE>



         12.5.  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 Contributor, each Owner and Acquiror, and each
party shall furnish the other with such documents or further assurances as the
requesting party may reasonably require.

         12.6.  NO ASSIGNMENT. After the Contract Date and prior to the Closing,
neither Contributor nor any Owner shall assign, alienate, lien, encumber or
otherwise transfer all or any part of its Project or any interest therein.

         12.7. AVAILABILITY OF RECORDS, AUDIT REPRESENTATION LETTER.

               12.7.1. If the Closing Date occurs after March 31, 2000, then
upon Acquiror's reasonable request, for a period of two years after the Closing,
Contributor shall (i) make the Records available to Acquiror for inspection,
copying and audit by Acquiror's designated accountants; and (ii) cooperate with
Acquiror (without any third party expense to Contributor) in obtaining any and
all permits, licenses, authorizations, and other Governmental Approvals
necessary for the operation of the Project. Without limitation of the foregoing
in this Section 12.7, if the Closing Date occurs after March 31, 2000, then
Contributor agrees to abide by the terms of EXHIBIT E attached hereto. If the
Closing Date occurs after March 31, 2000, then at any time before or within two
years after the Closing, Contributor further agrees to provide to the Acquiror's
designated independent auditor, upon the reasonable request of Acquiror or such
auditor, (x) access (to the same extent to which Acquiror would be entitled to
such access) to the books and records of the Projects and all related
information (including the information listed on EXHIBIT E) regarding the period
for which Acquiror is required to have the Projects audited under the
regulations of the SEC, and (y) a representation letter delivered by Contributor
regarding the books and records of the Project, in substantially the form as
attached hereto as EXHIBIT F.

         12.7.2.  In addition, if the Closing Date occurs after March 31, 2000,
then during such two year period Contributor shall provide, and cooperate in all
reasonable respects in providing, Acquiror with copies of, or access to, such
factual information as may be reasonably requested by Acquiror, and in the
possession or control of Contributor, 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 (as specified on EXHIBIT E attached
hereto), 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. The obligation
of Contributor to cooperate in providing Acquiror with such information for
Acquiror to file its Current Report on Form 8-K shall survive the Closing.


                                       26
<PAGE>


         12.8. CHANGE IN CONDITIONS. Contributor shall promptly notify Acquiror
of any change in any condition with respect to any Project or of the occurrence
of any event or circumstance that makes any representation or warranty of
Contributor to Acquiror under this Agreement untrue or misleading, or any
covenant of Acquiror under this Agreement incapable or less likely of being
performed, it being understood that Contributor's obligation to provide notice
to Acquiror under this Section 12.8 shall in no way relieve Contributor of any
liability for a breach by Contributor of any of its representations, warranties
or covenants under this Agreement.

         12.9. CORPORATE STRUCTURE. From the Contract Date through and including
the Closing Date, Contributor shall maintain the same composition of its direct
shareholders as exists on the Contract Date, unless otherwise expressly provided
in this Agreement or consented to by Acquiror in writing.

         12.10. CURE OF VIOLATIONS. On or before the Closing Date, Contributor
shall cure (or escrow sufficient funds at the Closing with the Title Company to
cure) all violation(s) of law, code, ordinance or regulation that arise and are
the subject of any written notice issued by a Governmental Authority with
respect to any Project during the period of Contributor's ownership of the
Contributed Interests.

         13.   INTENTIONALLY OMITTED


         14.   ADDITIONAL CONDITIONS PRECEDENT TO CLOSING.

               14.1.   ACQUIROR'S ADDITIONAL CONDITIONS PRECEDENT. In addition
to the other conditions enumerated in this Agreement, the following shall be
conditions precedent to Acquiror's obligation to close hereunder:

                       14.1.1. PHYSICAL CONDITION.  The physical condition of
Project shall be substantially the same on the Closing Date as on the Contract
Date, reasonable wear and tear excepted, unless the alteration of said physical
condition is the result of Damage. Without limiting the generality of the
foregoing, the parties acknowledge and agree that the failure by Contributor to
cure any violation described in Section 12.10 shall be a failure of this
condition precedent.

                       14.1.2. PENDING ACTIONS.  At the Closing, there shall be
no administrative agency, litigation or governmental proceeding of any kind
whatsoever, pending or threatened with respect to the Project, (i) that, after
the Closing, would, in Acquiror's reasonable discretion, materially and
adversely affect the value or marketability of the Project or the ability





                                       27
<PAGE>



of Acquiror to operate the Project in the manner it is being operated on the
Contract Date, or (ii) for the purpose of enjoining or preventing, or which
questions the validity or legality of, the transactions contemplated hereby.

                       14.1.3.  ASSUMED INDEBTEDNESS.  Contributor shall provide
to Acquiror a letter from the holder of the Existing Loan Documents that relates
to Assumed Indebtedness (if Acquiror elects to assume the same in accordance
with Section 3.1) dated no earlier than ten (10) days prior to the Closing Date,
(i) approving the transfer of the applicable Contributed Interests to the UPREIT
subject to the Assumed Indebtedness, (ii) setting forth the amount of principal
and interest outstanding on the Closing Date and confirming either (a) that
there are no other amounts due thereunder, or (b) if any other amounts are due,
stating the amount and nature thereof (which amounts shall in any event be paid
by Contributor), and (iii) confirming, to the knowledge of such holders, the
absence of any defaults under the Existing Loan Documents. Such letter shall be
referred to as the "LENDER'S APPROVALS."

                       14.1.4.  OWNERS.  The direct shareholders of Contributor
on the Closing Date shall be the same as on the Contract Date.

                       14.1.5.  BANKRUPTCY.  As of the Closing Date, neither
Contributor, any Owner, nor any Project shall be the subject of any bankruptcy
proceeding for which approval of this transaction has not been given and issued
by the applicable bankruptcy court.

                       14.1.6.  REPRESENTATIONS AND WARRANTIES TRUE.  The
representations and warranties of Contributor contained in this Agreement that
are qualified by materiality shall be true and correct as of the Closing Date,
and the other representations and warranties of Contributor contained in this
Agreement shall be true and correct as of the Closing Date in all material
respects; provided, however, that if any representation or warranty contained at
Sections 10.5, 10.6, 10.7, 10.9, 10.10, 10.11, 10.12 hereof is not true and
correct as of the Closing Date, then such failure or inaccuracy in the
representaion or warranty derives from a matter knowingly created or suffered by
Contributor.

                       14.1.7.  COVENANTS PERFORMED.  All covenants of
Contributor required to be performed on or prior to the Closing Date shall have
been performed in all material respects.

         14.2. CONTRIBUTOR'S ADDITIONAL CONDITIONS PRECEDENT. In addition to the
other conditions ecumerated in this Agreement, including the condition set forth
in Section 2.1, the following shall be conditions precedent to Contributor's
obligation to close hereunder:



                                       28
<PAGE>



                       14.2.1.  REPRESENTATIONS AND WARRANTIES.  The
representations and warranties of Acquiror contained in this Agreement that are
qualified by materiality shall be true and correct as of the Closing Date, and
the other representations and warranties of Contributor contained in this
Agreement shall be true and correct as of the Closing Date in all material
respects.

                       14.2.2.  COVENANTS.  All material covenants of Acquiror
required to be performed on or prior to the Closing Date shall have been
performed.

                       14.2.3.  PENDING ACTIONS.  At the Closing, there shall be
no administrative agency, litigation or governmental proceeding of any kind
whatsoever, pending or threatened, for the purpose of enjoining or preventing,
or which questions the validity or legality of, the transactions contemplated
hereby.

                       14.2.4.  BANKRUPTCY.  As of the Closing Date, neither
Acquiror, the REIT nor the UPREIT shall be the subject of any bankruptcy
proceeding for which approval of this transaction has not been given and issued
by the applicable bankruptcy court.

                       14.2.5.  NO MATERIAL ADVERSE CHANGE.  There shall have
occurred no material adverse change in the business, operations, condition
(financial or otherwise), properties or assets of the REIT or the UPREIT since
the Contract Date.

         15.      INTENTIONALLY OMITTED.

         16.      CLOSING DELIVERIES.

                  16.1. CONTRIBUTOR'S DELIVERIES. At the Closing (or such other
times as may be specified below), Contributor shall deliver or cause to be
delivered to Acquiror the following, each in form and substance reasonably
acceptable to Contributor and Acquiror and their respective counsel:

                         16.1.1.  ASSIGNMENT OF CONTRIBUTED INTERESTS.  An
assignment by Contributor of the Contributed Interest and its certificate of its
withdrawal from Deereco, Atrium and Brown's Wharf.

                         16.1.2.  RELEASE.  A release from Contributor releasing
each Owner and the UPREIT from any obligations and liabilities with respect to
any matter arising from business done, transactions entered into or events
occurring prior to the Closing Date.



                                       29
<PAGE>



                       16.1.3.  LENDER'S APPROVALS.  The Lender's Approvals from
the holders of all of the Assumed Indebtedness in conformity with SECTION
14.1.3.

                       16.1.4.  KEYS.  Keys to all locks located at the Project
(to the extent in Contributor's possession or control);

                       16.1.5.  AFFIDAVIT OF TITLE AND ALTA STATEMENT.  As to
each Project, an Affidavit of Title (or comparable document) limited solely to
status of parties in possession, absence of outstanding contracts of sale and
mechanics' and/or materialman liens and such additional affidavits as the Title
Company shall reasonably require in order to issue an owner's policy of title
insurance (or any appropriate endorsement, including without limitation
"nonimputation" and "same as survey" endorsements (if available), to any Owner's
existing policy of title insurance, if any, insuring the Owner's title as of the
Closing Date and in the amount of the applicable portion of the Asset Value)
free of any Prohibited Exceptions;

                       16.1.6.  LETTER TO TENANTS.  A letter executed by the
applicable Owner and, if applicable, its management agent, addressed to each
Tenant, in form reasonably acceptable to Acquiror, notifying each Tenant of the
transfer of its Project and directing payment of all rents accruing after the
Closing Date to be made to Acquiror or at its direction;

                       16.1.7.  INTENTIONALLY OMITTED.

                       16.1.8.  ORIGINAL DOCUMENTS.  To the extent not
previously delivered to Acquiror, originals of the Leases, Assigned Contracts
and Governmental Approvals that are in Contributor's possession or control (or,
if the originals have been lost or destroyed, copies that are in Contributor's
possession or control certified by Contributor as true, correct and complete);

                       16.1.9.  CLOSING STATEMENT.  A closing statement
conforming to the proration and other relevant provisions of this Agreement (the
"CLOSING STATEMENT") duly executed by Contributor;

                      16.1.10.  PLANS AND SPECIFICATIONS.  All plans and
specifications relating to the Project in Contributor's possession or control;

                      16.1.11.  TAX BILLS.  Copies of the most currently
available Tax Bills to the extent not previously delivered to Acquiror;

                      16.1.12.  ENTITY TRANSFER CERTIFICATE.  Entity transfer
certifications confirming that Contributor is a "United States Person" within
the meaning of Section 1445 of the Internal Revenue Code of 1986, as amended;



                                       30
<PAGE>



                       16.1.13.  RENT ROLL.  An updated Rent Roll, prepared as
of the Closing Date, certified by Contributor to be true, complete and correct
through the Closing Date;

                       16.1.14.  PARTNERSHIP DELIVERIES; WARRANT AGREEMENT.  The
documents that are referred to in the Partnership Agreement (as amended) in
connection with the admission of an additional limited partner (including the
Amendment) and the warrant agreement contemplated by Section 3.6 above, each of
such documents to be duly executed by Contributor or other person or entity
receiving LP Units hereunder;

                       16.1.15.  LP UNITS SCHEDULE.  The LP Units Schedule set
forth on SCHEDULE 4.1.2, duly executed by Contributor;

                       16.1.16.  CLOSING CERTIFICATE.  A certificate, signed by
Contributor and the LP Unit Recipients, certifying to the UPREIT that (a) the
representations and warranties of Contributor contained in this Agreement that
are qualified by materiality are true and correct as of the Closing Date and the
other representations and warranties of Contributor contained in this Agreement
are true and correct as of the Closing Date in all material respects, and (b)
all material covenants required to be performed by Contributor prior to the
Closing Date have been performed;

                       16.1.17.  OTHER.  Such other documents and instruments as
may reasonably be required by Acquiror (including those of Contributor's
Deliveries in Contributor's possession or control that have not previously been
delivered to Acquiror), its (or its underwriters' or lenders') counsel or the
Title Company and that may be necessary to consummate the transactions that are
the subject of this Agreement and to otherwise give effect to the agreements of
the parties hereto. After the Closing, Contributor shall, without cost to
Contributor, execute and deliver to Acquiror such further documents and
instruments as Acquiror shall reasonably request to effect these transactions
and otherwise effect the agreements of the parties hereto.

         16.2. ACQUIROR'S DELIVERIES. Unless previously delivered to
Contributor, at the Closing (or such other times as may be specified below),
Acquiror shall cause to be delivered to Contributor the following, each in form
and substance reasonably acceptable to Contributor and Acquiror and their
respective counsel:

                       16.2.1.  REGISTRATION CONFIRMATION.  A certificate from
the UPREIT certifying as to the registration of the LP Units in the books and
records of the UPREIT and the ownership by Contributor of such LP Units,
together with a copy of such books and records showing such ownership;



                                       31
<PAGE>



                       16.2.2.  PARTNERSHIP AGREEMENT.  A copy of the
Partnership Agreement, duly certified by the secretary of the REIT as true,
complete and correct;

                       16.2.3.  AMENDMENT; WARRANT AGREEMENT.  The Amendment and
the warrant agreement contemplated by Section 3.6 above, duly executed by the
REIT;

                       16.2.4.  ORGANIZATIONAL DOCUMENTS.  A copy certified by
the Secretary of State of the State of Delaware and Maryland, respectively, of
the Articles of Incorporation of Acquiror and the REIT and a good standing
certificate for Acquiror and the REIT; (ii) a copy certified by the Secretary of
State of the State of Delaware of the certificate of limited partnership of the
UPREIT and a good standing certificate for the UPREIT; and (iii) a copy,
certified by the secretary of the REIT, of the resolutions of the REIT's board
of trustees, authorizing the transactions described herein;

                       16.2.5.  CLOSING STATEMENT.  The Closing Statement, duly
executed by the UPREIT;

                       16.2.6.  REGISTRATION RIGHTS CONFIRMATION.  An
acknowledgment by the REIT that Contributor is entitled to the benefits of the
Registration Rights Agreement as a result of its admission as a limited partner
in the UPREIT;

                       16.2.7.  ASSIGNMENT.  The assignment by Acquiror of its
rights and obligations hereunder to the UPREIT;

                       16.2.8.  LP UNITS SCHEDULE.  The LP Units Schedule set
forth on SCHEDULE 4.1.2, duly executed by the UPREIT;

                       16.2.9.  TENANTS LETTER.  A letter to Tenants described
in Section 16.1.6 above, duly executed by the UPREIT; and

                      16.2.10.  CLOSING CERTIFICATE.  A certificate, signed by
Acquiror, certifying to the Contributor that (a) the representations and
warranties of Acquiror contained in this Agreement that are qualified by
materiality are true and correct as of the Closing Date and the other
representations and warranties of Acquiror contained in this Agreement are true
and correct as of the Closing Date in all material respects, and (b) all
material covenants required to be performed by Acquiror prior to the Closing
Date have been performed;

                      16.2.11.  OTHER.  Such other documents and instruments as
may reasonably be required by Contributor, the LP Unit Recipient or its or their
respective counsel or the Title Company and that are necessary to consummate the
transactions which are the subject



                                       32
<PAGE>



of this Agreement and to otherwise effect the agreements of the parties hereto.
After Closing, the UPREIT shall, without cost to the UPREIT, execute and deliver
to Contributor such further documents and instruments as Contributor shall
reasonably request to effect these transactions and otherwise effect the
agreements of the parties hereto.

                       16.2.12.  RELEASE.  A release from the UPREIT releasing
each Owner and Contributor from any obligations and liabilities with respect to
any matter arising from business done, transactions entered into or events
occurring after the Closing Date.

         17.   PRORATIONS AND ADJUSTMENTS. The following shall be prorated and
adjusted between Contributor and Acquiror as of the Closing Date, except as
otherwise specified:

               Except to the extent otherwise expressly provided in this
Agreement, with respect to apportionments hereunder for the Deereco and Atrium
Projects, all matters that were described in the contract of sale for the
Deereco and Atrium Projects by which Contributor acquired the limited liability
company interests in Deereco and Atrium (the "DEERECO/ATRIUM CONTRACT") as
matters to be apportioned between the seller and purchaser at the Closing under
the Deereco/Atrium Contract, shall be similarly apportioned between Contributor
and Acquiror at the closing hereunder in accordance with the provisions of the
Deereco/Atrium Contract. Except to the extent otherwise expressly provided in
this Agreement, with respect to apportionments hereunder for the Brown's Wharf
Project, all matters that were described in the contract of sale for the Brown's
Wharf Project by which Contributor acquired the limited liability company
interests in Brown's Wharf (the "BROWN'S WHARF CONTRACT") as matters to be
apportioned between the seller and purchaser at the closing under the Brown's
Wharf Contract, shall be similarly apportioned between Contributor and Acquiror
at the Closing hereunder in accordance with the provisions of the Brown's Wharf
Contract.

               17.1.  Distributions in respect of the LP Units acquired by the
LP Unit Recipients shall begin to accrue from and after the Closing Date
(notwithstanding the fact that such date may not be the applicable Record Date
under the Partnership Agreement), and the amount of distributions paid or to be
paid to the LP Unit Recipients for any quarter shall be prorated accordingly;

               17.2.  Such other items that are customarily prorated in
transactions of this nature shall be ratably prorated.

         For purposes of calculating prorations, Acquiror shall be deemed to be
in title to the Project, and therefore entitled to the income therefrom and
responsible for the expenses thereof, for the entire Closing Date. All such
prorations shall be made on the basis of the actual number of days of the year
and month that shall have elapsed as of the Closing Date. Bills received after



                                       33
<PAGE>



the Closing that relate to expenses incurred, services performed or other
amounts allocable to the period prior to the Closing Date shall be paid, in
cash, by Contributor, to the extent due and owing. Bills received by Contributor
after the Closing Date that relate to expenses incurred, services performed or
other amounts allocable to the period on or after the Closing Date, shall be
paid, in cash, by the Acquiror, to the extent due and owing.

         18.   CLOSING EXPENSES. Unless the Assumed Indebtedness is assumed by
Acquiror (in which case the provisions of Section 3.3 shall apply), Contributor
will pay the entire cost of all release fees, prepayment fees and any other fees
in connection with the payoff, release and satisfaction of the Assumed
Indebtedness and all fees imposed by its accountants and attorneys in connection
with this Agreement and the transaction contemplated hereunder. The provisions
of this Section 18 shall survive the Closing without time limitation.

         19.   DESTRUCTION, LOSS OR DIMINUTION OF REAL PROPERTY.  If, prior to
the Closing, all or any portion of any Project is damaged by fire or other
natural casualty (collectively, "DAMAGE"), or is taken or made subject to
condemnation, eminent domain or other governmental acquisition proceedings
(collectively, "EMINENT DOMAIN"), then the following procedures shall apply:

               19.1. Acquiror shall close and take the Project in question as
diminished by the Damage or Eminent Domain, as the case may be, subject to a
reduction in the Contribution Consideration otherwise due at the Closing, in the
amount set forth in Section 19.2 below.

               19.2. At the Closing, Contributor shall assign or pay over to
Acquiror all proceeds of Contributor's casualty insurance proceeds in the case
of any Damage (or condemnation awards in the case of any Eminent Domain). In
addition, in the case of any Damage, to the extent such amounts are insufficient
to pay for the full cost of the repair or replacement of the Project (whether by
reason of a deductible, uninsured amount or otherwise), Acquiror shall proceed
to close on all of the Projects subject to a reduction in the Contribution
Consideration equal to the difference between (a) the amount assigned or paid
over to Acquiror, and (b) the amount required to pay for the full cost of the
repair or replacement of the Project. Contributor shall fully cooperate with
Acquiror in the adjustment and settlement of the insurance claim or governmental
acquisition proceeding and if, as of the Closing, the insurance proceeds (or
condemnation award) assignable to Acquiror shall not have been collected from
the insurer or Governmental Authority, then a cash credit in the amount thereof
shall be given to Acquiror, to be repaid to Contributor out of and upon
Acquiror's actual receipt of insurance proceeds (or condemnation award). The
proceeds and benefits under any rent loss or business interruption policies
attributable to the period following the Closing shall likewise be transferred
and paid over (and, if applicable, likewise credited on an interim basis) to
Acquiror.



                                       34
<PAGE>



               19.3. In the event of a dispute between Contributor and Acquiror
with respect to the full cost of repair and/or replacement with respect to the
matters set forth in this Section 19, an engineer designated by Contributor and
an engineer designated by Acquiror shall select an independent engineer licensed
to practice in the jurisdiction where the Project in question is located who
shall resolve such dispute. All fees, costs and expenses of such third engineer
so selected shall be shared equally by Acquiror and Contributor.

         20.   DEFAULT; INDEMNITY.

               20.1. DEFAULT BY CONTRIBUTOR. In the event that the express
conditions of Contributor's obligations under this Agreement have been satisfied
(or have been waived or deemed waived), and Acquiror has complied with all
material terms and conditions set forth in this Agreement to be complied with by
Acquiror prior to or at Closing, and Contributor is unwilling or otherwise fails
to consummate Closing, then Contributor shall promptly reimburse Acquiror for
Acquiror's actual, documented, out-of-pocket expenses incurred in anticipation
of consummating the Closing, up to Twenty-Five Thousand Dollars ($25,000), and
thereupon Contributor shall, except as expressly provided in this Agreement,
have no further obligation or liability to Acquiror under this Agreement, and
this Agreement shall be null and void. In the alternative, and the foregoing
notwithstanding, Acquiror shall have the right to seek specific performance of
Contributor's obligation to contribute the Contributed Interests and complete
the Closing hereunder. The foregoing enumerated remedies shall be Acquiror's
sole and exclusive remedies hereunder at law or in equity.

               20.2. DEFAULT BY ACQUIROR. In the event that the express
conditions of Acquiror's obligations under this Agreement have been satisfied
(or have been waived or deemed waived), and Contributor has complied with all
material terms and conditions set forth in this Agreement to be complied with by
Contributor prior to or at Closing, and Acquiror is unwilling or otherwise fails
to consummate Closing, then Acquiror shall promptly reimburse Contributor for
Contributor's actual, documented, out-of-pocket expenses incurred in
anticipation of consummating the Closing, up to Twenty-Five Thousand Dollars
($25,000), and thereupon Acquiror shall, except as expressly provided in this
Agreement, have no further obligation or liability to Contributor under this
Agreement, and this Agreement shall be null and void. In the alternative, and
the foregoing notwithstanding, Contributor shall have the right to seek specific
performance of Acquiror's obligation to acquire the Contributed Interests, pay
the Contribution Consideration and complete Closing hereunder. The foregoing
enumerated remedies shall be Contributor's sole and exclusive remedies hereunder
at law or in equity.

               20.3.    INDEMNIFICATION.



                                       35
<PAGE>



               20.3.1. ACQUIROR, THE REIT AND THE UPREIT.  Contributor and each
LP Unit Recipient, jointly and severally, agree to and do hereby indemnify,
defend and hold harmless Acquiror, the UPREIT and the REIT, each of their
respective Affiliates, partners, members, officers, directors, shareholders,
agents and the employees of any of them, and each of their respective successors
and assigns (collectively, the "ACQUIROR INDEMNIFIED PARTIES"), from and against
any and all claims, losses, demands, liabilities, suits, administrative
proceedings, causes of action, costs and damages suffered by any Acquiror
Indemnified Party, but excluding consequential damages, and reasonable
attorneys' fees of counsel selected by any Acquiror Indemnified Party and other
costs of defense, incurred, arising against, or suffered by any Acquiror
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 Contributor set
forth in this Agreement, whether discovered before or after the Closing.

               20.3.2. CONTRIBUTOR AND THE LP UNIT RECIPIENTS.  Acquiror agrees
to and does hereby indemnify, defend and hold harmless Contributor and the LP
Unit Recipients and each of their respective partners, officers, directors,
shareholders, agents and employees, and each of their successors and assigns,
from and against any and all Losses arising out of, by virtue of or related in
any way to, a breach of any representation, warranty or covenant of Acquiror set
forth in this Agreement, whether discovered before or after the Closing.

               20.3.3. LIMITATIONS.

                       20.3.3.1  All representations and warranties set forth in
this Agreement shall survive the execution and delivery of this Agreement and
the consummation of the transactions contemplated hereby, regardless of any
investigation made by the parties hereto or their representatives, for a period
ending on the date which is one year after the Closing Date; PROVIDED, HOWEVER,
that any claim based on a representation or warranty actually known by the
indemnifying person to be untrue, without any affirmative duty of investigation,
shall survive without limit; PROVIDED FURTHER, HOWEVER, that no claim for breach
of a representation or warranty may be brought under this Agreement unless
written notice of such claim (stating the date of discovery thereof and the
factual basis therefor in reasonable detail) shall have been given on or prior
to the last day of the survival period (in which event each such representation
and warranty shall survive until such claim is finally resolved and all
obligations with respect thereto are fully satisfied). With respect to any claim
validly alleging a breach of a representation or warranty hereunder filed within
the period set forth above, the obligation to indemnify pursuant to this Section
20.3 shall survive without limit. All covenants, agreements and undertakings
hereunder shall survive the execution and delivery of this Agreement and the
consummation of the transactions contemplated hereby, regardless of any
investigation made by



                                       36
<PAGE>



the parties hereto or their representatives, without limit (except to the extent
expressly provided herein).

                       20.3.3.2  To the extent that any Contributor's
representation or warranty hereunder relates to a specific fact or circumstance
which occurred on or prior to Contributor's acquisition of the Contributed
Interests, the survival period applicable to such representation or warranty
hereunder shall expire contemporaneously with the expiration of the survival
period for the corresponding representation or warranty in the Deereco/Atrium
Contract or the Brown's Wharf Contract, as the case may be.

                       20.3.3.3  The indemnification obligations hereunder shall
be limited to claims made prior to the last date of survival of the applicable
representation, warranty or covenant referred to in this Agreement.

                       20.3.3.4  The amount of the indemnifying party's
liability under this Agreement shall be determined taking into account (A) any
applicable insurance proceeds actually received by the indemnified party, and
(B) any other savings realized in connection with such liability that actually
reduce the overall impact of the Losses upon the indemnified party.

                       20.3.3.5  Each indemnified party shall give reasonably
prompt notice to each indemnifying party of any action or proceeding commenced
against the indemnified party in respect of which indemnity may be sought
hereunder, but failure so to notify an indemnifying party (i) shall not relieve
it from any liability which it may have under any indemnity provided herein
unless and to the extent it did not otherwise learn of such action and the lack
of notice by the indemnified party results in the forfeiture by the indemnifying
party of substantial rights and defenses and (ii) shall not, in any event,
relieve the indemnifying party from any obligations to any indemnified party
hereunder other than its indemnification obligation. If the indemnifying party
so elects within a reasonable time after receipt of such notice, the
indemnifying party may assume the defense of such action or proceeding at such
indemnifying party's own expense with counsel chosen by the indemnifying party
and reasonably acceptable to the indemnified party. If an indemnifying party
does not assume such defense, after having received the notice referred to in
the first sentence of this Section 20.3.3.5, the indemnifying party or parties
will pay the reasonable fees and expenses of counsel for the indemnified party
or parties. In such event however, no indemnifying party will be liable for any
settlement effected without the written consent of such indemnifying party.
Except as specific in this Section 20.3.3.5, if an indemnifying party is
entitled to assume, and assumes, the defense of such action or proceeding in
accordance with this Section, such indemnifying party shall not be liable for
any fees and expenses of counsel for the indemnified parties incurred thereafter
in connection with such action or proceeding.



                                       37
<PAGE>



         21.   SUCCESSORS AND ASSIGNS. The terms, conditions and covenants of
this Agreement shall be binding upon and shall inure to the benefit of the
parties and their respective nominees, successors, beneficiaries and permitted
assigns. Neither party hereto shall have any right to assign this Agreement or
its rights hereunder; provided, however, subject to the provisions of Section
2.1 hereof, Acquiror shall prior to Closing assign its right, title and interest
under this Agreement to the UPREIT (or a successor partnership) but shall not
otherwise assign any of its rights hereunder.

         22.   LITIGATION. In the event of litigation between the parties with
respect to the Project, this Agreement, the performance of their respective
obligations hereunder or the effect of a termination under this Agreement, the
losing party shall pay all costs and expenses incurred by the prevailing party
in connection with such litigation, including reasonable attorneys' fees of
counsel selected by the prevailing party. The parties hereby further acknowledge
and agree that in the event of litigation between them, as contemplated above,
and the resolution of that litigation through compromise, settlement, or partial
judgment, the court before which such litigation is initially brought shall have
the right to allocate responsibility, between Contributor and Acquiror, for all
costs and expenses (including attorneys' reasonable fees) incurred by both
Contributor and Acquiror in the pursuit of that litigation resolved through
compromise, settlement or partial judgment. Notwithstanding any provision of
this Agreement to the contrary, the obligations of the parties under this
Section 22 shall survive termination of this Agreement and the Closing, if
applicable.

         23.   NOTICES. Any notice, demand or request which may be permitted,
required or desired to be given in connection therewith shall be given in
writing and directed to Contributor and Acquiror as follows:



                                       38
<PAGE>



<TABLE>
<CAPTION>
                  <S>                       <C>                                                                               <C>
                  Contributor:              United Properties Group, Incorporated
                                            305 W. Grand Avenue, Suite 100
                                            Montvale, New Jersey 07645
                                            Attention: Joseph S. Thompson
                                            Telephone: (201) 505-4080
                                            Facsimile: (201) 505-0481

                  With a copy to
                  its attorneys:            LeBoeuf, Lamb, Greene & MacRae, L.L.P.
                                            125 West 55th Street
                                            New York, New York 10019-5389
                                            Attention: James Verscaj, Esquire
                                            Telephone: (212) 424-8000
                                            Facsimile: (212) 424-8500

                  Acquiror:                 COPT ACQUISITIONS, INC.
                                            c/o Corporate Office Properties Trust
                                            8815 Centre Park Drive, Suite 400
                                            Columbia, MD 21045
                                            Attention: John H. Gurley, Esq.
                                            Telephone:        (410) 730-9092
                                            Facsimile:        (410) 740-1174

                  With a copy to
                  its attorneys:            MORGAN, LEWIS & BOCKIUS LLP
                                            1701 Market Street
                                            Philadelphia, PA  19103
                                            Attention: Eric L. Stern, Esquire
                                            Telephone:        (215) 963-5000
                                            Facsimile:        (215) 963-5299
</TABLE>

         Notices shall be deemed properly delivered and received when and if
either (i) personally delivered, including via confirmed facsimile; (ii) on the
first business day after deposit with a commercial overnight courier for
delivery on the next business day; or (iii) five (5) days after having be sent
via registered or certified first class mail, postage prepaid, return receipt
requested. Any party may change its address for delivery of notices by properly
notifying the others pursuant to this Section 23.



                                       39
<PAGE>

         24.   BENEFIT. This Agreement is for the benefit only of the parties
hereto and their nominees, successors, beneficiaries and assignees as permitted
in Section 21 above and no other person or entity shall be entitled to rely
hereon, receive any benefit herefrom or enforce against any party hereto any
provision hereof.

         25.   LIMITATION OF LIABILITY. All liabilities and obligations of
Acquiror under this Agreement shall be those of Acquiror only. Subject to the
consummation of the Assignment, Contributor shall not, under any circumstances,
look to any person or entity other than Acquiror, including any Affiliate of
Acquiror, for performance or satisfaction of Acquiror's obligations and
liabilities in connection with this Agreement. Without limiting the foregoing,
none of the REIT or any Affiliate of Acquiror or their respective members,
partners and shareholders shall incur any liability under any document or
agreement required in connection with this Agreement, and Acquiror 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. Except as otherwise specifically
provided in this Agreement, none of the UPREIT, the REIT and Acquiror shall
assume or discharge any debts, obligations, liabilities or commitments of
Contributor, whether accrued now or hereafter, fixed or contingent, known or
unknown.

         26.   BROKERAGE. Acquiror and Contributor 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 26.  The provisions of this Section 26 shall survive Closing or the
termination of this Agreement.

         27.   REASONABLE EFFORTS.  Contributor and Acquiror shall use their
reasonable, diligent and good faith efforts, and shall cooperate with and assist
each other in their efforts, to obtain any and all consents and approvals of
third parties (including governmental authorities) to the transaction
contemplated hereby, and to otherwise perform as may be necessary or otherwise
reasonably requested by the other party to effectuate the transfer of the
Project to Acquiror in accordance with, and to otherwise carry out the purposes
of, this Agreement.



                                       40
<PAGE>



         28.   MISCELLANEOUS.

               28.1. 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.

               28.2. TIME OF THE ESSENCE. Time is of the essence of this
Agreement. If any, date herein set forth for the performance of any obligations
by Contributor or Acquiror or for the delivery of any instrument or notice as
herein provided should be on a Saturday, Sunday or legal holiday, the compliance
with such obligations or delivery shall be deemed acceptable on the next
business day following such Saturday, Sunday or legal holiday. As used herein,
the term "legal holiday" means any state or federal holiday for which financial
institutions or post offices are generally closed in the State of Maryland for
observance thereof.

               28.3. CONDITIONS PRECEDENT. The obligations of the parties to
consummate the transactions contemplated hereby are subject to the express
conditions precedent set forth in this Agreement, each of which is for the sole
benefit of the applicable party and may be waived at any time by written notice
thereof from such party to the other. The waiver of any particular condition
precedent shall not constitute the waiver of any other.

               28.4. 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 both Contributor and Acquiror 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.

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

               28.6. 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.



                                       41
<PAGE>



               28.7. EXPENSES. Except and to the extent as otherwise
expressly provided to the contrary herein, Acquiror and Contributor shall each
bear its own respective costs and expenses relating to the transactions
contemplated hereby, including fees and expenses of legal counsel or other
representatives for the services used, hired or connected with the proposed
transactions mentioned above.

               28.8. CERTAIN SECURITIES MATTERS. No sale of LP Units is intended
by the parties by virtue of their execution of this Agreement. Any sale of LP
Units referred to in this Agreement will occur, if at all, upon the Closing.

               28.9. CERTAIN SCHEDULES. Schedules 10.5, 10.6, 10.7, 10.9,
10.10, 10.11 and 10.12 hereto which are incomplete as of June 23, 1999 shall
be prepared by Contributor and appended hereto prior to the Contract Date.
Contributor shall not knowingly create or suffer the creation of matters
which shall be the subject of such disclosure schedules and shall use
reasonable efforts to notify Acquiror as promptly as possible once
Contributor acquires knowledge of any such matters.

               28.10. 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.

                       [SIGNATURE PAGE FOLLOWS THIS PAGE]



                                       42
<PAGE>



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

                                CONTRIBUTOR AND LP UNIT RECIPIENT:

                                UNITED PROPERTIES GROUP, INCORPORATED, a
                                New York corporation

                                By:
                                    -------------------------------
                                Name:
                                Its:


                                ACQUIROR:

                                COPT ACQUISITIONS, INC., a Delaware corporation


                                By:
                                    -------------------------------
                                Name:
                                Its:



                                       43
<PAGE>



                                    EXHIBIT A



                  LISTING AND LEGAL DESCRIPTION OF EACH PROJECT

<TABLE>
<CAPTION>

<S>                        <C>                                         <C>              <C>               <C>
 Owner                      Project Street Address                      County           State             RSF.
- -------                     ----------------------                      -------         -------           -------

Deereco                    9690 Deereco Road                           Baltimore          MD

Atrium                     375 Padonia Road West                       Baltimore          MD

Brown's Wharf              1615, 1625 & 1629 Thames Street             Baltimore          MD
</TABLE>




                       [LEGAL DESCRIPTIONS TO BE ATTACHED]



                                       A-1
<PAGE>


                                    EXHIBIT B



                                PERSONAL PROPERTY



                            [CONTRIBUTOR TO IDENTIFY]



                                       B-1
<PAGE>



                                    EXHIBIT C




                               INVESTOR MATERIALS



     [CONTRIBUTOR TO IDENTIFY APPROPRIATE ACCREDITED INVESTOR CERTIFICATION]


                                       C-1
<PAGE>



                                    EXHIBIT D



                            CONTRIBUTOR'S DELIVERIES

   (TO THE EXTENT IN THE POSSESSION OF, OR UNDER THE CONTROL OF, CONTRIBUTOR)

          1. True and correct copies of the each Tenant's Lease and the tenant
 account records and payment histories applicable thereto.

          2. A rent roll (the "RENT ROLL") indicating all material information
pertaining to Tenants such as the name of each Tenant, spaces occupied and
vacant (including the rentable square footage of such spaces), Base Rent,
escalations, "pass-throughs" (including real estate taxes, utilities, insurance
and/or operating expenses), Additional Rent, rent adjustments (including
Consumer Price Index, or other adjustments) construction allowances, abatements,
concessions, lease commencement and expiration dates, renewal or expansion
options, options to purchase, cancellation rights, security and/or other
deposits in connection with the Leases.

         3. A copy of Contributor's most recent title insurance policy for each
Project, and a copy of Contributor's most recent survey of each Project.

         4. Copies of all hazard, rent loss, liability and other insurance
policies currently in force with respect to each Project.

         5. Copies of the current operating budget for each Project.

         6. Copies of reviewed financial statements (including statements of
assets, liabilities and partner's equity, statements of revenues and expenses,
statements of partner's equity and cash flow statements) and all monthly and
annual operating statements (collectively, the "FINANCIAL STATEMENTS") for each
Project for the current calendar year. Contributor shall deliver to Acquiror all
Financial Statements prepared in the ordinary course of business promptly upon
preparation thereof relating to periods prior to Closing, even if prepared after
Closing.

         7. Copies of all guarantees, warranties, engineering and architectural
plans and specifications, drawings, CAD diskettes (showing floor plans and/or
space plans), studies and surveys relating to each Project (collectively, the
"PLANS"), in Contributor's possession or control, and copies of any reports or
studies (including inspection reports of governmental



                                       D-1
<PAGE>

authorities or insurance carriers), in Contributor's possession or control, in
respect of the physical condition or operation of each Project or recommended
improvements thereto.

         8. Copies of the bill or bills issued, to the extent available, for the
current tax year for all real estate taxes and personal property taxes and
copies of any and all notices pertaining to real estate taxes or assessments
applicable to each Project. Copies of the bills issued, to the extent available,
for the current calendar year for all utilities serving each Project.
Contributor shall promptly deliver to Acquiror copies of any such bills or
notices received by Contributor after the Contract Date, even if received after
Closing.

         9. Copies of all brokerage commission, management, leasing,
maintenance, repair, service, pest control and supply contracts (including
janitorial, elevator, scavenger, laundry and landscaping agreements), equipment
rental agreements and master antenna agreements (if applicable), and any other
contracts or agreements relating to or affecting each Project (other than Major
Repair Contracts, as defined herein) or which will be binding upon each Project
or Acquiror subsequent to Closing, all as amended (the "CONTRACTS").

         10. Copies of all contracts for repairs or capital replacements to be
performed at each Project, or covering, such work performed during the two (2)
years immediately preceding the Contract Date for a contract price in excess of
$10,000.00 (the "MAJOR REPAIR CONTRACTS").

         11. Copies of all certificates of occupancy, licenses, permits,
authorizations and approvals required by law or by any governmental authority
having jurisdiction thereover in respect of each Project, or any portion
thereof, occupancy thereof or any present use thereof (the "GOVERNMENTAL
APPROVALS").

         12. A schedule of all employees of Contributor engaged in the
operation or maintenance of each Project, setting forth in respect of each
employee: such employee's name, position, duties, current salary or wages,
Christmas or other bonus, fringe benefits, accrued vacation time and sick leave,
and information as to any other compensation in cash or in kind to which such
employee may be entitled.

         13. Copies of the documents pursuant to which Contributor is organized
and operates its business, together with proof of the authority of the signatory
or signatories of this Agreement on behalf of Contributor to execute this
Agreement.

         14. Copies of all guarantees, warranties and other documents or
instruments evidencing or relating to the Improvements or the Personal Property
("WARRANTIES").

                                       D-2
<PAGE>



         15. Copies of all unrecorded easements and licenses of Contributor
for the benefit of each Project or portion thereof or of third parties burdening
each Project or portion thereof.

         16. Copies of all of the Existing Loan Documents (as defined in the
body of this Agreement) and any correspondence or notices pertaining thereto.


                                       D-3
<PAGE>



                                    EXHIBIT E



                           SEC REPORTING REQUIREMENTS


         For the period of time commencing on the date of the Contribution
Agreement and continuing through the second anniversary of the Closing Date,
Contributor shall, from time to time, upon reasonable advance notice from the
REIT, provide the REIT and its representatives, agents and employees with access
to all financial and other information in its possession or with respect to
which it has reasonable access pertaining to the period of Contributor's
ownership and operation of the Project, which information is relevant and
reasonably necessary, in the opinion of the REITs outside, third party
accountants (the "ACCOUNTANTS"), to enable the REIT and its Accountants to
prepare financial statements in compliance with any or all of (a) Rule 3-14 of
Regulation X-X of the Securities and Exchange Commission (the "COMMISSION"); (b)
any other rule issued by the Commission and applicable to REIT; and (c) any
registration statement, report or disclosure statement filed with the Commission
by, or on behalf of the REIT; provided, however, that in any such event(s), the
UPREIT shall reimburse Contributor for those third party, out-of-pocket costs
and expenses that Contributor incur in order to comply with the foregoing
requirements. Contributor acknowledges and agrees that the following is a
representative description of the information and documentation that the REIT
and the Accountants may require in order to comply with (a), (b) and (c) above.
Contributor shall provide such information, and documentation on a per-Project
basis, if available.

1.       Rent rolls for the calendar month in which the closing occurs and the
         eleven (11) calendar months immediately preceding the calendar month in
         which the Closing occurs;

2.       Contributor's written analysis of both (a) scheduled increases in base
         rent required under the Leases, and (b) rent concessions granted in the
         Leases, and the straight line effect of (a) and (b);

3.       Contributor's internally-prepared Financial Statements;

4.       Access to the Leases;

5.       Contributor's budgeted annual and monthly income and expenses, compared
         to actual annual and monthly income and expenses;

6.       Most currently available real estate tax bills;

                                       E-1
<PAGE>



7.       Access to Contributor's cash receipt journal(s) and bank statements for
         the Project;

8.       Contributor's general ledger with respect to the Project;

9.       Contributor's schedule of expense reimbursements required under the
         Leases;

10.      Schedule of those items of repairs and maintenance performed by, or at
         the direction of Contributor, during Contributor's final fiscal year in
         which Contributor owns and operates the Project (the "FINAL FISCAL
         YEAR");

11.      Schedule of those capital improvements and fixed asset additions made
         by, or at the direction of, Contributor during the Final Fiscal Year;

12.      Access to Contributor's invoices with respect to expenditures made
         during the Final Fiscal Year; and

13.      Access (during normal and customary business hours) to responsible
         personnel to answer accounting questions.

                                       E-2
<PAGE>



                                    EXHIBIT F


                           AUDIT REPRESENTATION LETTER


         [Date]

         Dear  Sirs:

         We are writing at your request to confirm our understanding that your
audit of the statement of operating income for the year ended December 31, 1997,
was made for the purpose of expressing an opinion as to whether the statement of
operating income presents fairly, in all material respects, the results of
operations of [Name of Project] in conformity with generally accepted accounting
principles. In connection with your audit we confirm, to the best of our
knowledge and belief, the following representations made during your audit.

         1. All financial records, board minutes and data related to the
property have been made available to you.

         2. There have been no:

            a. Irregularities involving any member of management or employees
            who have significant roles in the system of internal accounting
            control structure.

            b. Irregularities involving other employees that could have a
            material effect on the financial statements.

            c. Communications from regulatory agencies concerning noncompliance
            with, or deficiencies in, financial reporting practices that
            could have a material effect on the financial statements.

            d. Violations or possible violations of laws or regulations, the
            effects of which should be considered for disclosure in the
            financial statements or as a basis for recording a loss
            contingency.

         3. There are no:


                                       F-1
<PAGE>



            a. Unasserted claims or assessments that are probable of assertion
            and must be disclosed in accordance with Statement of Financial
            Accounting Standards No. 5.

            b. Material liabilities or gain or loss contingencies (including
            oral and written guarantees) that are required to be accrued or
            disclosed by Statement of Financial Accounting Standards No. 5.

            c. Material transactions that have not been properly recorded in the
            accounting records underlying the financial statements.

            d. Events that have occurred subsequent to December 31, 1997 in the
            financial statements that would require adjustment to, or
            disclosure in, the financial statements, except for the sale
            which you are aware of.

         4. Appropriate adjustment, when material, has been made for:

            a. Uncollectible amounts recorded under lease contracts.

            b. Rental income received in advance.

            c. Rent concessions, abatements, or rent holidays.

         5. The Company has complied with all aspects of contractual agreements
that would have a material effect on the financial statements in the event of
noncompliance.

         6. All significant related party transactions have been properly
recorded or disclosed in the financial statements.

         7. In the opinion of the undersigned the _____________ and
______________ financial information provided to you contains all adjustments
necessary for a fair presentation of operating income.

                                            By:



                                            [Contributor/Contributor's Manager]


                                       F-2
<PAGE>



                                    EXHIBIT G



                                WARRANT AGREEMENT
<PAGE>

THIS WARRANT HAS BEEN ACQUIRED FOR INVESTMENT PURPOSES ONLY AND HAS NOT BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR UNDER THE SECURITIES
LAWS OF ANY STATE AND, ACCORDINGLY, MAY NOT BE TRANSFERRED, SOLD, PLEDGED,
HYPOTHECATED OR ASSIGNED IN THE ABSENCE OF REGISTRATION UNDER SUCH ACT AND ANY
SUCH LAW APPLICABLE THERETO OR AN EXEMPTION THEREFROM.


No. 1                                                              Common Units

                                     FORM OF
                       WARRANT TO PURCHASE COMMON UNITS OF
                        CORPORATE OFFICE PROPERTIES, L.P.

                          Expiration Date:
                                          ------------


         This Warrant Certificate certifies that United Properties Group,
Incorporated, a New York corporation (the "HOLDER"), is the registered holder of
this Warrant Certificate (the "WARRANT") to purchase common units (the "COMMON
UNITS") of CORPORATE OFFICE PROPERTIES, L.P., a Delaware limited partnership
(the "LIMITED PARTNERSHIP"). This Warrant entitles the Holder upon exercise to
purchase from the Limited Partnership, during the Exercise Period (as defined
below), the number of Common Units as determined under Section 2 below at the
initial exercise price per unit (the "EXERCISE PRICE") equal to $.01 upon (1)
surrender of this Warrant with the form of election to purchase attached hereto
properly completed and executed and (ii) payment of the Exercise Price at the
office of the Limited Partnership designated for such purpose, pursuant to and
subject only to the conditions set forth in this Warrant. The Exercise Price and
number of Common Units issuable upon exercise of this Warrant are subject to
adjustment upon the occurrence of certain events set forth herein.

         Section 1.  EXERCISE OF WARRANT.

                  (a) Subject to the terms of this Warrant, the Holder shall
have the right to exercise this Warrant commencing on the fifth anniversary of
the date hereof and ending at 5:00 p.m., Eastern time on the tenth anniversary
of the date hereof. If not exercised within the Exercise Period, this Warrant
shall become void and all rights hereunder and all rights in respect hereof
shall become void and shall cease as of such time.

                  (b) No fractional units shall be issued upon the exercise of
this Warrant (or any portion hereof). In the event that the exercise of this
Warrant, in full or in part, would result in the issuance of any fractional
Common Unit, the Limited Partnership shall, in lieu of issuing any fractional
Common Unit, pay the Holder a sum in cash equal to the then current market price
of one common share of beneficial interest, par value $.01 per share ("COMMON
SHARE"), of Corporate



<PAGE>



Office Properties Trust ("COPT"), the sole general partner of the Limited
Partnership, multiplied by such fraction.

                  (c) This Warrant may be exercised upon surrender to the
Limited Partnership at its office (the address of which is set forth below) of
this Warrant with the form of election to purchase attached hereto duly filled
in and signed, and upon payment to the Limited Partnership of the Exercise
Price, subject to adjustment as set forth herein, for the number of Common Units
in respect of which this Warrant is then exercised. Payment of the aggregate
Exercise Price shall be made in cash or by certified or official bank check
payable to the order of the Limited Partnership or wire transfer in immediately
available funds to such account as shall be designated by the Limited
Partnership.

                  (d) Upon such surrender of this Warrant and payment of the
Exercise Price by the Holder, the Limited Partnership shall issue and cause to
be delivered within three (3) business days to the Holder and in the Holder's
name, a certificate, receipt or other evidence of ownership for the number of
full Common Units issuable upon the exercise of this Warrant.

                  (e) This Warrant shall be exercisable, at the election of the
Holder, either in full or from time to time in part, and in the event that this
Warrant is exercised in respect of fewer than all of this Common Units issuable
on such exercise at any time during the Exercise Period, the Limited Partnership
shall, at the time of delivery of this Warrant, deliver to the Holder a new
Warrant exercisable for the remaining number of Common Units, which new Warrant
shall in all other respects be identical with this Warrant.

                  (f) All Common Units issued upon the exercise of this Warrant
shall be validly issued and free from all taxes, liens and charges with respect
to the issue thereof (other than transfer taxes).

                  (g) The Limited Partnership shall pay all expenses, taxes
(other than transfer taxes or income taxes of the Holder) and other charges
payable in connection with the preparation, issuance and delivery of the Warrant
and the Common Units issuable thereunder; PROVIDED, HOWEVER, that in no event
shall the Limited Partnership pay any costs or expenses incurred by UPG for
legal or other professional services in connection with the preparation,
issuance and delivery of the Warrant and the Common Units issuable thereunder.

                  (h) This Warrant shall be canceled and disposed of by the
Limited Partnership when surrendered upon exercise. The Limited Partnership
shall keep copies of this Warrant and any notices given or received hereunder
available for inspection by the Holder during normal business hours at its
office.

         Section 2. CALCULATION OF COMMON UNITS. The number of Common Units
purchasable upon exercise of this Warrant shall be determined based upon the
market price of the Common Shares as follows:


                                      - 2 -
<PAGE>



     CU    =   (Target Share Price - Achieved Price) X Common Shares Outstanding
               -----------------------------------------------------------------
                                              Achieved Price

where:

     CU    =   the number of Common Units exercisable pursuant to this Warrant;
               PROVIDED, HOWEVER that the number shall not exceed 20% of the
               Common Shares Outstanding.


     ACHIEVED PRICE = The higher of:

     a)       the highest closing stock price of the Common Shares sustained for
              60 days of which 20 must be consecutive during the period between
              the first day of the second full year following the date hereof
              and the last day of the eleventh month in the fifth year
              following the date hereof, or


     b)       the average closing stock price of the Common Shares for the first
              fifteen business days of the twelfth month of the fifth year
              following the date hereof;

     PROVIDED, HOWEVER that the Achieved Price shall not exceed $14.21 nor be
     less than $10.50.

     COMMON SHARES OUTSTANDING = the number of Common Shares into which the
     convertible preferred units issued to UPG by the Limited Partnership
     pursuant to the Contribution Agreement among UPG, the Limited Partnership
     and COPT, dated on or about June 25, 1999, are convertible.

     TARGET SHARE PRICE = $14.21 - [(14.21 - Achieved Price) x .43].

Section 3. ADJUSTMENT OF EXERCISE PRICE AND NUMBER OF COMMON UNITS ISSUABLE. The
Exercise Price and the number of Common Units issuable upon exercise of this
Warrant are subject to adjustment from time to time as set forth below.

     (a) ADJUSTMENT OF EXERCISE PRICE. If COPT (1) pays a dividend or makes a
     distribution on its Common Shares in Common Shares, (2) subdivides its
     outstanding Common Shares into a greater number of Common Shares, or (3)
     combines its outstanding Common Shares into a smaller number of Common
     Shares, then the Exercise Price shall be adjusted in accordance with the
     formula:

                                   E(1) = E X O
                                             ---
                                              A


                                      - 3 -
<PAGE>



where:

             E(1) =   the adjusted Exercise Price.

             E    =   the current Exercise Price.

             O    =   the number of Common Shares outstanding prior to such
                      action.

             A    =   the number of Common Shares outstanding immediately after
                      such action.

             In the case of a dividend or distribution, the adjustment shall
become effective immediately after the record date for determination of holders
of Common Shares entitled to receive such dividend or distribution, and in the
case of a subdivision, combination or reclassification, the adjustment shall
become effective immediately after the effective date of such corporate action.
The adjustment set forth above shall be made successively whenever any event
listed above shall occur.

             (b) WHEN ADJUSTMENT NOT REQUIRED. If COPT shall take a record of
the holders of its Common Shares for the purpose of entitling them to receive a
dividend or distribution and shall, thereafter and before the distribution to
stockholders thereof, legally abandon its plan to pay or deliver such dividend
or distribution, then thereafter no adjustment shall be required by reason of
the taking of such record and any such adjustment previously made in respect
thereof shall be rescinded and annulled.

             (c) ADJUSTMENT IN NUMBER OF COMMON UNITS. Upon each adjustment of
the Exercise Price as set forth above, this Warrant shall thereafter evidence
the right to receive upon payment of the adjusted Exercise Price that number of
Common Units obtained from the following formula:

                                   N(1) = N X E
                                             ---
                                             E(1)

where:

            N(1) =   the adjusted number of Common Units issuable upon exercise
                     of this Warrant by payment of the adjusted Exercise Price.

            N    =   the number of Common Units previously issuable upon the
                     exercise of this Warrant by payment of the Exercise Price
                     prior to adjustment.

            E(1) =   the adjustment Exercise Price.

            E    =   the Exercise Price prior to adjustment.


                                      - 4 -
<PAGE>



              (d)   NOTICE OF ADJUSTMENT. Whenever COPT intends to take such
action that would result in an adjustment to the Exercise Price or number of
Common Units underlying this Warrant, COPT or the Limited Partnership shall
provide written notice of such adjustment to the Holder not less than 15 days
prior to the record date or effective date, as the case may be, of such action,
which notice shall (i) describe in reasonable detail the action requiring such
adjustment and specify the record date or effective date of such action and (ii)
set forth, if determinable, the required adjustment and the calculation thereof.
If the required adjustment and calculation thereof are not determinable at the
time of such notice, COPT or the Limited Partnership shall give notice thereof
to the Holder promptly after such adjustment becomes determinable.

              (e)   CERTAIN OTHER EVENTS. If any event occurs after the date of
issuance of this Warrant as to which the foregoing anti-dilution provisions of
this Section 3 are not strictly applicable or, if strictly applicable, would not
fairly protect the anti-dilution rights of the Holder in accordance with the
essential intent and principles of such provisions, then COPT shall make such
adjustments in the application of such provisions as shall be reasonably
necessary, in the good faith opinion of COPT, to protect such anti-dilution
rights as aforesaid.

              (f)   REORGANIZATION OF COPT. If any reorganization or
reclassification of the shares of beneficial interest of COPT, any consolidation
or merger of COPT with another entity, or the sale of all or substantially all
of COPT's assets to another entity (any such event a "REORGANIZATION
TRANSACTION") shall be effected in such a way that the holders of Common Shares
shall be entitled to receive stock, securities, cash or assets in exchange for
such Common Shares, adequate provisions shall be made whereby the Holder shall
thereafter have the right to purchase and receive upon the basis and the terms
and conditions specified herein and in lieu of the Common Units immediately
theretofore purchasable and receivable upon the exercise of the rights
represented hereby, such shares of stock, securities, cash or assets as may be
issued or payable in such Reorganization Transaction in exchange for the number
of Common Shares into which the Common Units represented hereby are convertible
had such exercise and conversion rights been exercised immediately prior to the
Reorganization Transaction. For purposes of this Section 3(f), in the event that
a Reorganization Transaction occurs during a period when the Achieved Price is
determinable, then the number of Common Units underlying this Warrant shall be
calculated in accordance with Section 2 and if the Reorganization Transaction
occurs prior to the time that the Achieved Price is determinable, then this
Warrant shall be deemed to be exercisable for that number of Common Units as the
parties working together in good faith, using their diligent, reasonable best
efforts shall agree.

         Section 4. RESERVATION OF COMMON SHARES. Prior to the fifth anniversary
of the date hereof and until the termination of the Warrant, COPT shall reserve
and keep available out of its authorized but unissued Common Shares, solely for
the purpose of effecting the exchange of Common Shares for the Common Units
underlying this Warrant, a number of Common Shares as shall from time to time be
sufficient to effect such exchange, and if at any time the number of authorized
but unissued Common Shares shall not be sufficient to effect such exchange, COPT
will take such corporate action as may, in the opinion of its counsel, be
necessary to increase its authorized but unissued


                                      - 5 -

<PAGE>



Common Shares to such number as shall be sufficient for such purpose. Without
limiting the foregoing, neither COPT nor the Limited Partnership shall by any
action including, without limitation, amending its organizational documents or
through any reorganization, transfer of assets, consolidation, merger,
dissolution, issue or sale of securities or any other voluntary action, avoid or
seek to avoid the observance of performance of any of the terms of this Warrant,
but will at all times in good faith assist in the carrying out of all such terms
and in the taking of all such actions as may be necessary or appropriate to
protect the rights of the Holder against impairment.

         Section 5. MUTILATED OR MISSING WARRANT CERTIFICATE. In case this
Warrant is mutilated, lost, stolen or destroyed, the Limited Partnership shall
issue, in exchange and substitution for and upon cancellation of the mutilated
Warrant, or in lieu of and substitution of this Warrant, a new Warrant of like
tenor and representing an equivalent number of Common Units, but only upon
receipt of evidence reasonably satisfactory to the Limited Partnership of such
loss, theft or destruction of this Warrant.

         Section 6. RESTRICTION ON TRANSFER. This Warrant shall be
non-transferable and may only be exercised, in whole or from time to time in
part, by the Holder.

         Section 7. NOTICES GENERALLY. Any notice or other communication
required or permitted to be given hereunder shall be in writing and shall be
effective (a) upon hand delivery or delivery by confirmed telecopy or facsimile
at the address or number designated below (if delivered on a business day during
normal business hours where such notice is to be received), or the first
business day following such delivery (if delivered other than on a business day
during normal business hours where such notice is to be received) or (b) on the
second business day following the date of mailing by express courier service,
fully prepaid, addressed to such address, or upon actual receipt of such
mailing, whichever shall first occur. The addresses and facsimile numbers for
such communications shall be.
<TABLE>
<CAPTION>

    <S>                                      <C>                             <C>
    (i)  If to the Limited Partnership:      Corporate Office Properties, L.P.
                                             8815 Center Park Drive, Suite 400
                                             Columbia, MD  21045-2272
                                             Attention: General Counsel
                                             Facsimile: (410) 740-1174

    (ii)     If to the Holder:

                                             Attention: General Counsel

                                             Facsimile:
</TABLE>

or at such other address as either party shall have specified by notice in
writing.


                                      - 6 -
<PAGE>



         Section 8. SUCCESSORS AND ASSIGNS. Except as otherwise provided herein,
this Warrant shall be binding upon and inure to the benefit of the parties and
their successors and assigns. COPT and the Limited Partnership may assign their
obligations under this Warrant, including by operation of law, in the event of a
consolidation, merger or sale of all or substantially all of its assets,
provided that such assignee assumes all obligations of COPT or the Limited
Partnership, as applicable, hereunder, and appropriate adjustment of the
provisions contained in this Warrant is made to place the Holder in the same
position as it would have been but for such consolidation, merger or sale.

         Section 9. WAIVERS. No waiver by either party of any default with
respect to any provision, condition or requirement of this Warrant shall be
deemed to be a continuing waiver in the future or a waiver of any other
provision, condition or requirement hereof, nor shall any delay or omission of
either party to exercise any right hereunder in any manner impair the exercise
of any such right accruing to it thereafter.

         Section 10. GOVERNING LAW. This Warrant shall be deemed to be a
contract made under the laws of the State of Delaware and for all purposes shall
be governed by and construed and enforced in accordance with the internal laws
of such state without regard to such state's principles of conflict of laws.

         Section 11.  AMENDMENT.  This Warrant may be amended only by a written
instrument, signed by the Holder and the Limited Partnership, which specifically
states that it is amending this Warrant.

         Section 12.  HEADINGS.  The headings herein are for convenience only,
do not constitute a part of this Warrant and shall not be deemed to limit or
affect any of the provisions hereof.

         Section 13. SEVERABILITY. If any provision of this Warrant is held to
be illegal, invalid or unenforceable under any present or future law, and if the
rights or obligations of any party hereto will not be materially and adversely
affected thereby, such provision will be fully severable.

         Section 14. ENTIRE AGREEMENT. This Warrant contains the entire
understanding of the parties with respect to the matters covered hereby, and
except as specifically set forth herein, neither of the parties hereto makes any
representation, warranty, covenant or undertaking with respect to such matters.


                           [SIGNATURE PAGE TO FOLLOW]


                                      - 7 -
<PAGE>



         IN WITNESS WHEREOF, the Limited Partnership has caused this Warrant to
be duly executed by an authorized officer.

Dated:

                                  CORPORATE OFFICE PROPERTIES, L.P.,
                                  a Delaware limited partnership


                                  By:  CORPORATE OFFICE PROPERTIES TRUST,
                                       a Maryland Real Estate Investment Trust,
                                       its sole General Partner


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


                                      - 8 -
<PAGE>



                         [Form of Election to Purchase]

                 (To be Executed upon Exercise of this Warrant)

         The undersigned registered holder of this Warrant irrevocably
exercises the attached Warrant for and purchases _____ Common Units and
tenders payment for such Common Units to the order of Corporate Office
Properties, L.P. in the amount of $________ in accordance with the terms of
the attached Warrant. The undersigned requests that certificate(s) for such
Common Units be issued and registered in the name of ________________________,
whose address is _________________________ and that such certificate(s) be
delivered to__________________________________ whose address is
____________________________ . If said number of Common Units is less than all
of the Common Units purchasable under this Warrant, the undersigned requests
that a new Warrant representing the remaining balance of such Common Units be
registered in the name of _______________________________ , whose address is
_________________________ and that such Warrant be delivered to
__________________________________ whose address is ________________________.



Date:                                       By:
     ----------------                          --------------------------------
                                            Name:
                                               --------------------------------
                                            Its:
                                               --------------------------------


                                      - 9 -
<PAGE>



                                   ATTACHMENT

     ILLUSTRATION OF THE COMMON UNIT CALCULATION AS SET FORTH IN SECTION 2:

     If the actual Achieved Price is $13.00 per share, the Target price = $13.69
computed as follows:
         $14.21 - [($14.21 - $13.00) x 0.43] = $13.69

     and the number of common units is 126,643 computed as follows:

         ($13.69 - $13.00) = $0.69 x 2,381,000/$13.00 = 126,376 rounded to
                                                        126,643 per common units
                                                                table below

Common Units Table (as assumed issuance of $25,000,000.00 in preferred units):

<TABLE>
<CAPTION>

            ACHIEVED PRICE                      NUMBER OF COMMON UNITS                    % OF COMMON ISSUED
            --------------                      ----------------------                    ------------------
            <S>                                 <C>                                       <C>                                  <C>
                $14.21                                     0                                     0.00%
                $14.00                                  20,409                                   0.86%
                $13.80                                  40,424                                   1.70%
                $13.60                                  61,028                                   2.56%
                $13.40                                  82,247                                   3.45%
                $13.20                                 104,109                                   4.37%
                $13.00                                 126,643                                   5.32%
                $12.80                                 149,882                                   6.29%
                $12.60                                 173,858                                   7.30%
                $12.40                                 198,608                                   8.34%
                $12.20                                 224,169                                   9.41%
                $12.00                                 250,583                                  10.52%
                $11.80                                 277,891                                  11.67%
                $11.60                                 306,142                                  12.86%
                $11.40                                 335,383                                  14.09%
                $11.20                                 365,669                                  15.36%
                $11.00                                 397,056                                  16.68%
                $10.80                                 429,606                                  18.04%
                $10.60                                 463,384                                  19.46%
                $10.50                                 476,200                                  20.00%
</TABLE>


                                     - 10 -




<PAGE>



                                    EXHIBIT H



                       AMENDMENT TO PARTNERSHIP AGREEMENT

         The Amendment shall reflect, incorporate and give effect to the
provisions of (i) Sections 2 and 3 of the Contribution Rights Agreement dated
June 23, 1999, between the UPREIT and Contributor, and (ii) Section 3 of this
Agreement.


                                       H-1
<PAGE>



                                 SCHEDULE 4.1.2



                                LP UNITS SCHEDULE
                            (DISTRIBUTION AT CLOSING)

<TABLE>
<CAPTION>

                           Ownership Percentage
  LP Unit Recipient           in the Project              Number of LP Units
  -----------------        ---------------------          ------------------
  <S>                      <C>                            <C>                <C>

</TABLE>

                            [CONTRIBUTOR TO IDENTIFY]


<PAGE>



                                  SCHEDULE 5.2



                                PROJECT CONTACTS



                            [CONTRIBUTOR TO IDENTIFY]


<PAGE>

                                  SCHEDULE 10.5



                              CONDEMNATIONS NOTICES


<PAGE>



                                  SCHEDULE 10.6



                               EXISTING VIOLATIONS



<PAGE>



                                  SCHEDULE 10.7



                               EXISTING LITIGATION



<PAGE>



                                  SCHEDULE 10.9



                         EXISTING TENANT DEFAULT NOTICES



<PAGE>



                                 SCHEDULE 10.10



                                    CONTRACTS



                            [CONTRIBUTOR TO IDENTIFY]



<PAGE>



                                 SCHEDULE 10.11



                                   WARRANTIES



<PAGE>



                                 SCHEDULE 10.12



                         EXISTING ENVIRONMENTAL MATTERS



<PAGE>



                                 SCHEDULE 10.13



                              ASSUMED INDEBTEDNESS



                            [CONTRIBUTOR TO IDENTIFY]

<TABLE>
<CAPTION>

                                                                Outstanding
   Owner                Project Street Address                Principal Balance         Interest Rate
   -----                ----------------------                -----------------         -------------
<S>                     <C>                                   <C>                       <C>                                     <C>
   Deereco              9690 Deereco Road

   Atrium                375 Padonia Road West

   Brown's Wharf        1615, 1625 & 1629 Thames Street
</TABLE>



<PAGE>



                                 SCHEDULE 11.1.4

<TABLE>
<CAPTION>


                               OWNERSHIP INTERESTS

      Owner of
 Partnership Interest      Residence/State of Formation     Type of Interest     Percentage
 --------------------      ----------------------------     ----------------     ----------
<S>                        <C>                              <C>                  <C>


</TABLE>

                            [CONTRIBUTOR TO IDENTIFY]


<PAGE>



                                  SCHEDULE 12.4



  DISCLOSED UNPERFORMED ALTERATIONS, INSTALLATIONS, DECORATIONS AND OTHER WORK

                              [LIST TO BE ATTACHED]



<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<CASH>                                           6,250
<SECURITIES>                                         0
<RECEIVABLES>                                    2,091
<ALLOWANCES>                                        51
<INVENTORY>                                          0
<CURRENT-ASSETS>                                     0
<PP&E>                                         572,023
<DEPRECIATION>                                  11,940
<TOTAL-ASSETS>                                 583,393
<CURRENT-LIABILITIES>                                0
<BONDS>                                        318,179
                                0
                                         10
<COMMON>                                           168
<OTHER-SE>                                     169,109
<TOTAL-LIABILITY-AND-EQUITY>                   583,393
<SALES>                                              0
<TOTAL-REVENUES>                                38,065
<CGS>                                                0
<TOTAL-COSTS>                                   16,067
<OTHER-EXPENSES>                                 1,685
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              10,966
<INCOME-PRETAX>                                      0
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                              9,347
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                  (838)
<CHANGES>                                            0
<NET-INCOME>                                     7,103
<EPS-BASIC>                                       0.38
<EPS-DILUTED>                                     0.33


</TABLE>


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