Exhibit 99.1








Corporate Office Properties Announces 1997 Fourth Quarter and Year End Results

     Highlights  * 1997 Funds from  Operations  (FFO) per share up 33% to $.80 *
Fourth quarter 1997 FFO per share up 60% to $0.24

     Philadelphia,  Pennsylvania,  March 6, 1998 -- Corporate Office  Properties
Trust,  Inc.  (Nasdaq-COPT)  today reported FFO of $1,039,000 or $.24 per common
share/unit  for the fourth  quarter  ended  December  31,  1997 as  compared  to
$218,000 or $.15 per common share/unit for the fourth quarter 1996, representing
a per  share/unit  increase in FFO of 60%.  Revenues for the fourth quarter 1997
increased  637% to $4,719,000  and net operating  income grew 532% to $4,010,000
compared to the fourth quarter 1996.

     For the year ended  December 31, 1997,  FFO grew to  $1,718,000 or $.80 per
common share/unit compared to $847,000 or $.60 per common share/unit for 1996, a
per share/unit  increase of 33%. Revenues for 1997 increased  approximately 163%
to $6,618,000 and net operating income grew 138% to $5,890,000 compared to 1996.
The Company's FFO dividend  payout ratio  decreased to 63% for 1997 from 84% for
1996.

     The Company's improved performance results directly from the acquisition of
the  Mid-Atlantic  operations  of the The Shidler  Group on October 14, 1997. In
connection with the  acquisition,  Corporate Office  Properties'  total weighted
average  common shares and units  increased to 4,326,000 for the fourth  quarter
1997 and  2,153,000 for the year ended 1997 from  1,420,000  shares for both the
fourth quarter and year ended 1996.






     Corporate Office Properties Trust, Inc. (formerly Royale Investments, Inc.)
acquired the  Mid-Atlantic  suburban  office  operations  of The Shidler  Group,
consisting  of 10 properties  totalling 1.5 million  square feet located in Blue
Bell and  Harrisburg,  Pennsylvania  and  Princeton,  New Jersey  along with its
entire management team.

     Commenting on the Company's  results,  Clay W. Hamlin,  III,  President and
Chief Executive  Officer,  stated,  "Our  transformation  reflects the strategic
repositioning  of the Company into a high growth  suburban  office REIT. We feel
confident that our ability to identify the areas of greatest  opportunity in the
market and our  disciplined  acquisition  strategy will continue to grow FFO per
share/unit and deliver a strong return on investment to our shareholders."

     Corporate Office Properties Trust, Inc. is a self-administered  real estate
investment trust focused on the acquisition, ownership and operation of suburban
office properties located in high-growth submarkets.

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                                      # # #

                            Financial Tables Attached


     This press  release  contains  forward-looking  information  based upon the
Company's current best judgment and expectations. Actual results could vary from
those  presented  herein.  The  risks  and  uncertainties  associated  with  the
forward-looking  information  include the strength of the commercial office real
estate markets in which the Company  operates,  competitive  market  conditions,
general  economic  growth,  interest  rates and capital market  conditions.  For
further  information,  please refer to the Company's filings with the Securities
and Exchange Commission.









                     Corporate Office Properties Trust, Inc.


                                                                     Three Months Ended December 31,      Year Ended December 31,
                                                                       1997            1996                1997              1996
Operating Data:                                                               (Dollars in thousands, except per share data)
                                                                                                            

Revenue:
    Rental income ...........................................     $    4,241      $      633          $    6,122         $    2,477
    Tenant reimbursements and other income ..................            478               7                 496                 32
                                                                  ----------      ----------          ----------         ----------
           Total revenue ....................................          4,719             640               6,618              2,509
                                                                  ----------      ----------          ----------         ----------
Expenses:
    Interest ................................................          1,935             309               2,855              1,246
    Depreciation and amortization............................            905             142               1,331                567
    Property expenses .......................................            709               6                 728                 31
    General and administrative ..............................            262             104                 533                372
    Termination of Advisory Agreement (1) ...................          1,353              --               1,353                 --
                                                                  ----------      ----------          ----------         ----------
           Total expenses ...................................          5,164             561               6,800              2,216
                                                                  ----------      ----------          ----------         ----------

Income (loss) before minority interests......................           (445)             79                (182)               293
Minority interests:
  Preferred units............................................           (785)             --                (720)                --
  Common units                                                            --              --              (   65)                --
                                                                  ----------      ----------          ----------         ----------
Net income (loss)............................................      $  (1,230)       $     79           $    (967)         $     293
                                                                  ==========      ==========          ==========         ==========
Income (loss) before minority interests......................      $     445        $     79           $    (182)         $     293
Less: Distributions to preferred units.......................           (720)             --                (720)                --
Add: Real estate depreciation................................            851             139               1,267                554
Add: Termination of Advisory Agreement (1)...................          1,353              --               1,353                 --
                                                                  ----------      ----------          ----------         ----------
Funds from Operations ("FFO")................................      $   1,039        $    218           $   1,718          $     847
                                                                  ==========      ==========          ==========         ==========
Weighted average number of shares outstanding................          2,137           1,420               1,601              1,420
Weighted average number of units outstanding.................          2,189              --                 552                 --
                                                                  ----------      ----------          ----------         ----------
Total weighted average number of share/units outstanding.....          4,326           1,420               2,153              1,420
                                                                  ==========      ==========          ==========         ==========
FFO - basic..................................................     $     0.24      $     0.15          $     0.80         $     0.60
                                                                  ==========      ==========          ==========         ==========
Net income (loss) per common share...........................    $     (0.58)     $     0.06          $    (0.60)        $     0.21
                                                                  ==========      ==========          ==========         ==========
Cash dividends/distributions per common share/unit ..........     $     0.13      $     0.13          $     0.50         $     0.50
                                                                  ==========      ==========          ==========         ==========
FFO payout ratio.............................................           54%             82%                 63%                84%
                                                                  ==========      ==========          ==========         ==========



                                                                            

Balance Sheet Data (as of period end):
Real estate investments, net of accumulated
    depreciation ...........................................      $  188,625      $   23,070
Total assets ...............................................         193,534          24,197
Mortgages payable ..........................................         114,375          14,658
Total liabilities ..........................................         117,008          15,026
Minority interests .........................................          64,862             -
Stockholders' equity........................................          11,664           9,171




Property Data (as of period end):
Number of properties owned .................................              17               7
Total net rentable square feet owned (in thousands) ........           1,852             370
Occupancy...................................................              99%            100%


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

1)   Reflects a non-recurring  expense of $1,353 associated with the termination
     of the Advisory  Agreement which was paid in the form of Common Stock. This
     transaction has been eliminated in determining FFO since it is not expected
     to have a continuing impact on the Company.