PRIME GROUP REALTY TRUST
10-Q, 1998-11-16
REAL ESTATE INVESTMENT TRUSTS
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                                  UNITED STATES

                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D. C. 20549

                                    FORM 10-Q

          (X) QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 (D) OF THE

                         SECURITIES EXCHANGE ACT OF 1934

                For the quarterly period ended September 30, 1998

          ( ) TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (D) OF THE

                         SECURITIES EXCHANGE ACT OF 1934

                         Commission File Number: 1-13589

                            PRIME GROUP REALTY TRUST

             (Exact name of registrant as specified in its charter)

                 MARYLAND                                         36-4173047
        (State or other jurisdiction of                       (I.R.S. Employer
         incorporation or organization)                      Identification No.)

77 WEST WACKER DRIVE, SUITE 3900, CHICAGO, ILLINOIS                 60601
   (Address of principal executive offices)                       (Zip Code)

                                 (312) 917-1300
              (Registrant's telephone number, including area code)

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. Yes x   No
                                      ---     ---

Indicate the number of shares  outstanding  of each of the  issuer's  classes of
common stock, as of the latest practicable date:

At November 13, 1998, 15,122,594 of the Registrant's Common Shares of Beneficial
Interest were outstanding.


<PAGE>
                            PRIME GROUP REALTY TRUST
                                    FORM 10-Q

                                      INDEX
                                      -----

PART I: FINANCIAL INFORMATION

Item 1:  Financial Statements (Unaudited)                                   Page
                                                                            ----
         Consolidated Balance Sheets of Prime Group Realty
         Trust as of September 30, 1998 and December 31, 1997...........       3

         Consolidated Statement of Income of Prime Group
         Realty Trust for the Three Months Ended September 30,
         1998 and the Combined Statement of Operations of the
         Predecessor Properties (predecessor to Prime Group
         Realty Trust) for the Three Months Ended September 30, 1997....       4

         Consolidated Statement of Income of Prime Group
         Realty Trust for the Nine Months Ended September 30,
         1998 and the Combined Statement of Operations of the
         Predecessor Properties (predecessor to Prime Group
         Realty Trust) for the Nine  Months Ended September 30, 1997....      5

         Consolidated Statement of Cash Flows of Prime Group
         Realty Trust for the Nine Months Ended September 30,
         1998 and the Combined Statement of Cash Flows of the
         Predecessor Properties (predecessor to Prime Group
         Realty Trust) for the Nine Months Ended September 30, 1997.....   6 - 7

         Notes to Consolidated and Combined Financial
         Statements of Prime Group Realty Trust and of the
         Predecessor Properties (predecessor to Prime Group
         Realty Trust)..................................................  8 - 14

Item 2.  Management's Discussion and Analysis of Financial
         Condition and Results of Operations............................ 15 - 22

Item 3.  Quantitative and Qualitative Disclosures About Market Risk.....      22

PART II: OTHER INFORMATION

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

Signatures ..............................................................     25

                                     -2-
<PAGE>
<TABLE>
PART I. FINANCIAL INFORMATION
ITEM 1:  FINANCIAL STATEMENTS
                            PRIME GROUP REALTY TRUST
                           CONSOLIDATED BALANCE SHEETS
                       (000'S OMITTED, EXCEPT SHARE DATA)
                                   (UNAUDITED)

<CAPTION>
                                                    SEPTEMBER 30,  DECEMBER 31,
                                                       1998            1997
                                                     -----------    -----------
<S>                                                  <C>            <C>
                      ASSETS
Real estate and equipment, at cost:
    Land .........................................   $   138,964    $    92,440
    Building and improvements ....................       692,630        496,839
                                                     -----------    -----------
                                                         831,594        589,279
    Accumulated depreciation .....................       (18,240)        (2,338)
                                                     -----------    -----------
                                                         813,354        586,941
    Property under development ...................        43,353             --
                                                     -----------    -----------
                                                         856,707        586,941

Mortgage note receivable .........................        58,590         56,511
Cash and cash equivalents ........................         8,138         11,969
Tenant receivables ...............................         4,625          3,820
Restricted cash escrows ..........................        49,750          3,175
Deferred rent receivable .........................        38,881         37,828
Deferred costs, net ..............................        31,623         28,472
Due from affiliates ..............................         8,037          5,258
Other ............................................        29,917          7,494
                                                     -----------    -----------
Total assets .....................................   $ 1,086,268    $   741,468
                                                     ===========    ===========

      LIABILITIES AND SHAREHOLDERS' EQUITY
Mortgage notes payable ...........................   $   296,956    $    90,610
Credit facilities ................................       138,700        159,000
Mortgage note payable - Affiliate ................            --          3,984
Bonds payable ....................................        74,450         74,450
Accrued interest payable .........................         1,973          1,245
Accrued real estate taxes ........................        31,836         17,915
Accounts payable and accrued expenses ............        20,220         13,903
Liabilities for leases assumed ...................         4,790          5,758
Dividends payable ................................         8,122          2,505
Other ............................................         7,083            822
                                                     -----------    -----------
Total liabilities ................................       584,130        370,192
Minority interests:
    Operating Partnership ........................       148,859        147,207
    Other ........................................         1,000             --
Shareholders' equity:
    Preferred shares, $0.1 par value, 30,000,000
    authorized:
      Series B Cumulative Redeemable Preferred
       Shares, 4,600,000 designated; 4,000,000
       issued and outstanding.....................            40             --
      Series A Cumulative Convertible Preferred
       Shares, 2,000,000 designated, issued and
       outstanding................................            20             20
    Common shares, $.01 par value; 100,000,000
     shares authorized; 15,325,594 and 12,980,000
     shares issued and outstanding at September
     30, 1998 and December 31, 1997,
     respectively.................................           153            130
    Additional paid-in capital ...................       361,954        225,632
    Distributions in excess of earnings ..........        (9,888)        (1,713)
                                                     -----------    -----------
Total shareholders' equity .......................       352,279        224,069
                                                     -----------    -----------
Total liabilities and shareholders' equity .......   $ 1,086,268    $   741,468
                                                     ===========    ===========
<FN>
          See notes to consolidated and combined financial statements.
</FN>
</TABLE>
                                      -3-
<PAGE>
<TABLE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
           AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
               CONSOLIDATED STATEMENT OF INCOME OF THE COMPANY AND
               COMBINED STATEMENT OF OPERATIONS OF THE PREDECESSOR
                     (000'S OMITTED, EXCEPT PER SHARE DATA)
                                   (UNAUDITED)
<CAPTION>
                                                         THREE MONTHS ENDED
                                                            SEPTEMBER 30
                                                    ---------------------------
                                                        1998            1997
                                                    ------------   ------------
                                                    PRIME GROUP    PREDECESSOR
                                                    REALTY TRUST   PROPERTIES
                                                    ------------   ------------
<S>                                                 <C>            <C>
REVENUE
Rental ...........................................  $     28,049   $      8,839
Tenant reimbursements ............................         9,488          3,875
Mortgage note interest ...........................         1,415             --
Other ............................................         2,300            217
                                                    ------------   ------------

Total revenue ....................................        41,252         12,931

EXPENSES
Property operations ..............................         8,817          2,497
Real estate taxes ................................         6,869          2,361
Depreciation and amortization ....................         6,611          4,074
Interest .........................................         7,615          6,885
Interest - Affiliates ............................            --          2,978
Financing fees ...................................            --            294
Property and asset management fees - Affiliates ..            --            276
General and administrative .......................         1,651          1,087
                                                    ------------   ------------
Total expenses ...................................        31,563         20,452
                                                    ------------   ------------

Income (loss) before minority interest ...........         9,689         (7,521)
Minority interest ................................        (3,902)            98
                                                    ------------   ------------
Net income (loss) ................................  $      5,787   $     (7,423)
                                                    ------------   ============

Net income allocated to preferred shareholders ...        (2,950)
                                                    ------------

Net income available to common shareholders ......  $      2,837
                                                    ============

Net income available per  weighted-average
 common share of beneficial interest -
  Basic and diluted...............................  $       0.18
                                                    ============
<FN>
          See notes to consolidated and combined financial statements.
</FN>
</TABLE>
                                      -4-
<PAGE>
<TABLE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
           AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)

               CONSOLIDATED STATEMENT OF INCOME OF THE COMPANY AND
               COMBINED STATEMENT OF OPERATIONS OF THE PREDECESSOR
                     (000'S OMITTED, EXCEPT PER SHARE DATA)
                                   (UNAUDITED)
<CAPTION>
                                                          NINE MONTHS ENDED
                                                            SEPTEMBER 30
                                                    ---------------------------
                                                        1998            1997
                                                    ------------   ------------
                                                    PRIME GROUP     PREDECESSOR
                                                    REALTY TRUST    PROPERTIES
                                                    ------------   ------------
<S>                                                 <C>            <C>
REVENUE
Rental............................................  $     69,525   $     24,970
Tenant reimbursements.............................        27,889         11,644
Mortgage note interest............................         4,429            ---
Other ............................................         5,083            906
                                                     -----------   ------------

Total revenue.....................................       106,926         37,520

EXPENSES
Property operations...............................        20,758          6,815
Real estate taxes.................................        19,101          7,951
Depreciation and amortization.....................        18,186         10,566
Interest..........................................        22,091         20,472
Interest - Affiliates.............................           ---          8,627
Financing fees....................................           ---            934
Property and asset management fees - Affiliates...           ---          1,077
General and administrative........................         4,695          2,973
Provision for environmental remediation costs.....           ---          3,205
                                                    ------------   ------------

Total expenses....................................        84,831         62,620
                                                    ------------   ------------

Income (loss) before minority interest and
  extraordinary item..............................        22,095        (25,100)
Minority interest.................................        (9,069)           466
                                                    ------------   ------------

Income (loss) before extraordinary item...........        13,026        (24,634)
Extraordinary loss on extinguishment of debt,
  net of minority interest of $375................          (525)           ---
                                                    ------------   ------------

Net income (loss).................................  $     12,501   $    (24,634)
                                                    ------------   ============

Net income allocated to preferred shareholders....        (4,991)
                                                    ------------

Net income available to common shareholders ......  $      7,510
                                                    ============

Net income available per  weighted-average
    common share of beneficial interest -
    Basic and diluted.............................  $       0.51
                                                    ============

<FN>
          See notes to consolidated and combined financial statements.
</FN>
</TABLE>
                                      -5-
<PAGE>
<TABLE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
           AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)

             CONSOLIDATED STATEMENT OF CASH FLOWS OF THE COMPANY AND
               COMBINED STATEMENT OF CASH FLOWS OF THE PREDECESSOR
                                 (000'S OMITTED)
                                   (UNAUDITED)

<CAPTION>
                                                         NINE MONTHS ENDED
                                                           SEPTEMBER 30
                                                    ---------------------------
                                                        1998           1997
                                                    ------------   ------------
                                                    PRIME GROUP    PREDECESSOR
                                                    REALTY TRUST    PROPERTIES
                                                    ------------   ------------
<S>                                                 <C>            <C>
OPERATING ACTIVITIES
Net income (loss).................................  $     12,501   $    (24,634)
Adjustments to reconcile net income (loss) to
 net cash provided by (used in) operating
 activities:
  Amortization of costs for leases assumed
    (included in rental revenue)..................           852            873
  Depreciation and amortization...................        18,186         10,566
  Interest added to principal on mortgage note
    payable - Affiliate...........................           ---          8,619
  Standby loan fee-affiliate added  to principal
    on mortgage note payable - Affiliate..........           ---            393
  Minority interest...............................         9,069           (466)
  Extraordinary item, net.........................           525            ---
  Changes in operating assets and liabilities:
    Increase in tenant receivables................          (805)        (3,559)
    (Increase) decrease in deferred rent
      receivable..................................        (1,053)           221
    Increase in deferred costs....................           ---         (1,601)
    (Increase) decrease in other assets ..........        (6,558)           473
    Increase (decrease) in accrued interest
      payable.....................................           728           (287)
    Increase (decrease) in accrued real estate
      taxes.......................................        13,921           (304)
    Increase (decrease) in accounts payable and
      accrued expenses............................           999         (1,254)
    Decrease in liabilities for leases assumed ...          (968)          (879)
    Increase in other liabilities ................         6,261          1,867
                                                    ------------   ------------

Net cash provided by (used in) operating
  activities......................................        53,658         (9,972)








                                      -6-
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
           AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)

             CONSOLIDATED STATEMENT OF CASH FLOWS OF THE COMPANY AND
         COMBINED STATEMENT OF CASH FLOWS OF THE PREDECESSOR (CONTINUED)
                                 (000'S OMITTED)
                                   (UNAUDITED)

                                                         NINE MONTHS ENDED
                                                           SEPTEMBER 30
                                                    ---------------------------
                                                        1998           1997
                                                    ------------   ------------
                                                    PRIME GROUP    PREDECESSOR
                                                    REALTY TRUST    PROPERTIES
                                                    ------------   ------------
INVESTING ACTIVITIES
Expenditures for real estate and equipment........  $   (281,974)  $     (4,270)
Leasing costs.....................................        (2,174)           ---
Additions to mortgage note receivable.............        (2,079)           ---
Increase in restricted cash escrows...............       (46,575)           ---
(Increase) decrease in due from affiliates........        (2,779)         2,803
                                                    ------------   ------------

Net cash used in investing activities.............      (335,581)        (1,467)

FINANCING ACTIVITIES
Proceeds from the sale of Series B Cumulative
  Redeemable Preferred Shares.....................        94,369            ---
Common stock repurchases .........................        (4,013)           ---
Proceeds from the private placement of common
  shares..........................................        47,194            ---
Proceeds from mortgage notes payable..............       291,656            736
Proceeds from mortgage notes payable- affiliate...           ---          2,820
Net repayment of Credit Facility..................       (20,300)           ---
Repayment of mortgage notes payable...............       (84,611)           (62)
Repayment of mortgage note payable- affiliate.....        (3,984)          (225)
Financing costs...................................       (19,520)           ---
Increase in due to affiliates ....................           ---          5,164
Contributions from minority interest - other .....         1,000            ---
Distribution to minority interest - operating
  partnership.....................................        (8,641)           ---
Distributions to partners.........................           ---             (3)
Dividends paid to preferred shareholders..........        (2,386)           ---
Dividends paid to common shareholders.............       (12,672)           ---
                                                    ------------   ------------

Net cash provided by financing activities.........       278,092          8,430
                                                    ------------   ------------

Net decrease in cash and cash equivalents.........        (3,831)        (3,009)

Cash and cash equivalents at beginning of period..        11,969          5,573
                                                    ------------   ------------

Cash and cash equivalents at end of period........  $      8,138   $      2,564
                                                    ============   ============

<FN>
          See notes to consolidated and combined financial statements.
</FN>
</TABLE>
                                      -7-
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
           AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)

             NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS
                                   (UNAUDITED)

1.   BASIS OF PRESENTATION

The accompanying  unaudited  consolidated and combined financial statements have
been prepared in accordance with generally  accepted  accounting  principles for
interim financial information and with the instructions to Form 10-Q and Article
10 of Regulation  S-X.  Accordingly,  they do not include all of the information
and footnotes required by generally accepted accounting  principles for complete
financial statements. In the opinion of management,  all adjustments (consisting
of normal recurring accruals)  considered necessary for a fair presentation have
been included.  Operating  results for the nine month period ended September 30,
1998 are not necessarily  indicative of the results that may be expected for the
year ended December 31, 1998. For further information, refer to the consolidated
financial  statements and footnotes  thereto  included in the Prime Group Realty
Trust's  annual report on Form 10-K for the fiscal year ended  December 31, 1997
as filed with the  Securities  and Exchange  Commission on March 31, 1998 ("Form
10-K").

Certain prior period amounts have been  reclassified to conform with the current
financial statement presentation.

2.   FORMATION OF THE COMPANY

Prime Group Realty Trust  ("Prime" or the  "company")  was formed in Maryland on
July 21,  1997 to succeed to and expand the office and  industrial  real  estate
business of The Prime Group,  Inc.  ("PGI"),  which  consisted of a portfolio of
five office and seventeen  industrial  properties,  as well as a parking  garage
facility  and the office and  industrial  real  estate  ownership,  acquisition,
development,  leasing and management  businesses  historically  conducted by PGI
(the  "Predecessor  Properties").  On November 17,  1997,  Prime  completed  its
initial  public  offering  ("IPO") of  12,980,000  common  shares of  beneficial
interest and the private placement of 2,000,000 Series A Cumulative  Convertible
Preferred Shares of beneficial interest. Prime's assets are owned and controlled
by, and all of its operations are conducted  through,  Prime Group Realty,  L.P.
(the  "Operating  Partnership")  and other  subsidiaries.  PGI  contributed  its
interest in the Predecessor  Properties to the Operating Partnership in exchange
for  3,375,000  common  units  of  the  Operating  Partnership.   The  Operating
Partnership  also sold 4,569,893  common units in the Operating  Partnership for
$85.0  million  to  Primestone  Investment  Partners,  L.P.  ("Primestone  Joint
Venture"), a joint venture between PGI and certain affiliates of Blackstone Real
Estate Advisors, L.P.

Pursuant to financing  arrangements  for the  properties,  the  partnerships  or
limited liability companies which are subsidiaries of the Operating  Partnership
and own the properties, often have, as a partner or member, a separate corporate
subsidiary of Prime whose board of directors  includes an  independent  director
that, as required by such financing arrangements,  must approve the commencement
of any  voluntary  dissolution  or  insolvency  proceeding  with respect to such
subsidiary.

3.   INCOME TAXES

Commencing  with the period ended  December 31, 1997,  Prime has filed as a real
estate  investment  trust ("REIT")  under the Internal  Revenue Code of 1986, as
amended. As a REIT, Prime generally will not be subject to federal income tax to
the extent that it  distributes  at least 95% of its REIT taxable  income to its
shareholders.  REITs are subject to a number of  organizational  and operational
requirements.  If Prime  fails to qualify as a REIT in any taxable  year,  Prime
will be subject to federal  income tax  (including  any  applicable  alternative
minimum tax) on its taxable income at regular corporate tax rates.

                                      -8-
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
           AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)

       NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS - CONTINUED
                                   (UNAUDITED)

4.   USE OF ESTIMATES

The  preparation  of the  financial  statements  in  conformity  with  generally
accepted  accounting  principles  requires  management  to  make  estimates  and
assumptions  that  affect the  reported  amounts of assets and  liabilities  and
disclosure of  contingent  assets and  liabilities  at the date of the financial
statements and the reported amounts of revenue and expenses during the reporting
period. Actual results could differ from these estimates.

5.   RECENT DEVELOPMENTS

During the period  from  January  1, 1998  through  September  30,  1998,  Prime
acquired the following eight office properties:

<TABLE>
<CAPTION>
                                        NET    ACQUISITION   MORTGAGE
                                     RENTABLE       COST      DEBT (*)
                                      SQUARE        (IN        (IN       MONTH
    PROPERTY          LOCATION        FEET       MILLIONS)   MILLIONS)  ACQUIRED
    --------          --------      ---------  -----------   ---------  --------
<S>                   <C>           <C>        <C>           <C>        <C>
33 North Dearborn    Chicago, IL      302,818    $  34.4     $   18.0     1/98
Commerce Point       Arlington
                      Hts., IL        236,642       29.2         20.0     2/98
208 South LaSalle
  Street             Chicago, IL      827,494       61.2         45.8     3/98
122 South Michigan   Chicago, IL      512,369       29.6          ---     4/98
2100 Swift Drive     Oak Brook, IL     58,000        7.4          5.2     4/98
6400 Shafer Court    Rosemont, IL     161,730       21.3         14.4     5/98
Two Century Centre   Schaumburg, IL   217,960       35.7          ---     6/98
Oak Brook Business
  Center             Oak Brook, IL    199,245       16.2          ---     6/98
                                    ---------    -------     --------
                                    2,516,258    $ 235.0     $  103.4
                                    =========    =======     ========
</TABLE>

(*) See Management's  Discussion and Analysis of Financial Condition and Results
of Operations  -"Liquidity and Capital  Resources" for a description of the debt
terms.

During the period  from  January  1, 1998  through  September  30,  1998,  Prime
acquired the following parcels of land:

<TABLE>
<CAPTION>
                                                         ACQUISITION
                                                             COST       MONTH
    PROPERTY                 LOCATION           ACRES   (IN MILLIONS)  ACQUIRED
    --------                 --------           -----   -------------  --------
<S>                       <C>                   <C>     <C>            <C>
Aurora Land - I           Aurora, IL             37.3      $  3.1        6/98
Aurora Land - II          Aurora, IL             17.4         1.4        6/98
DeKalb Land               DeKalb, IL             42.1         0.6        7/98
Rolling Meadows Land      Rolling Meadows, IL     0.6         0.1        7/98
Libertyville Industrial
  Land                    Libertyville, IL       12.8         2.0        7/98
Libertyville Office
  Land                    Libertyville, IL       21.6         3.3        9/98
                                               ------     -------
                                                131.8     $  10.5
                                               ======     =======
</TABLE>

The Aurora Land contracts  require  purchase of an additional 132.7 acres over a
three to five year period for additional consideration of $10.4 million. Certain
minimum installment  payments are required;  however, the timing of purchases is
at Prime's discretion.  On September 26, 1998, Prime made a $170,000 installment
payment.

                                      -9-
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
           AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)

       NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS - CONTINUED
                                   (UNAUDITED)

5.   RECENT DEVELOPMENTS (CONTINUED)

Concurrently  with the closing of its IPO,  Prime  obtained a secured  revolving
credit facility (the "Credit Facility") from a group of financial  institutions.
In March 1998,  April 1998 and October 1998, the Credit  Facility was amended to
provide that the  commitments  under the Credit  Facility be reduced from $235.0
million to $200.0 million,  $190.0 million and $80.0 million,  respectively (see
Note 9).

In January 1998, Prime obtained a $15.0 million  revolving line of credit with a
financial institution (the "Line of Credit").  The Line of Credit, which matures
in January  1999 and is subject to a one-year  extension at Prime's  option,  is
collateralized  by  an  industrial   property  known  as  475  Superior  Avenue.
Outstanding  balances  under the Line of Credit bear interest at a rate equal to
LIBOR plus 195 basis points.  Generally,  the covenants contained in the Line of
Credit are identical to the covenants contained in the Credit Facility.

Concurrently  with the  closing  of its IPO,  Prime  borrowed  $83.5  million in
financing  on a  short-term  basis  evidenced  by two  separate  notes (the "New
Mortgage Notes") which were  collateralized by first mortgages on certain office
and industrial  properties.  On April 1, 1998,  Prime  refinanced one of the New
Mortgage Notes (which had an original principal balance of $27.5 million) with a
loan of $29.4  million,  which will mature on March 23,  2008.  Interest on this
loan is  fixed  for 10  years at a rate of 6.85%  and is  payable  monthly.  The
remaining  New Mortgage Note (which had an original  principal  balance of $56.0
million) was  refinanced on May 1, 1998 with two loans,  the first of which is a
$47.0  million loan which has principal and interest  payable  monthly,  using a
30-year  amortization period, with interest fixed at 7.17% and a maturity of May
1, 2008. The second loan is a $14.6 million loan which has interest only payable
monthly  at 150 basis  points  over  LIBOR or .50% plus the  greater  of (a) the
lender's U.S. prime rate or (b) the Federal Funds Rate plus 1.0%, and matures on
May 1, 2000, not including a six-month  extension  option.  The refinanced notes
are   collateralized  by  first  mortgages  on  certain  office  and  industrial
properties.  As  a  result  of  the  above  refinancing,   Prime  recognized  an
extraordinary   item  of  $525,000,   net  of  minority  interest  of  $375,000,
representing the write-off of previously unamortized deferred financing fees.

In  February  1998,  Prime  refinanced  $48.8  million of letters of credit that
provided credit enhancements on certain of Prime's bonds payable from the Credit
Facility to a separate financing  facility provided by a financial  institution.
The new  letters of credit have an annual fee of 1.4% of the face amount and are
collateralized  by mortgages on certain  industrial and office  properties and a
$5.0 million cash collateral account.

On March 31, 1998 and on  September  28,  1998,  Prime  issued a total of 22,500
common  shares  granted to two officers of the company and 2,500  common  shares
granted a board member of the company pursuant to their employment agreements or
consulting agreement, as applicable.

On March 25, 1998,  Prime  completed a private  placement  of  2,579,994  common
shares to  institutional  investors and received  proceeds,  net of  underwriter
discount,  of  approximately  $49.2  million,   which  were  used  to  fund  the
acquisition of the office properties located at 208 South LaSalle Street and 122
South Michigan Avenue.

On  March  30,  1998,  Prime  entered  into a joint  venture  that  acquired  an
approximately  67,000  square foot vacant parcel of land located in the Chicago,
Illinois central business district  ("Chicago CBD"). The parcel was acquired for
the  potential   development  of  a  Class  A   multi-purpose   facility,   with
approximately  1,000,000  square  feet of office  space,  approximately  100,000
square  feet  of  retail  space  and  a  parking  garage  with  a  capacity  for
approximately  250 cars.  Prime has economic  control of the joint  venture and,

                                      -10-
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
           AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)

       NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS - CONTINUED
                                   (UNAUDITED)

5.  RECENT DEVELOPMENTS (CONTINUED)

therefore, has consolidated the operations of the joint venture from the date of
inception.  The joint  venture  entered  into a bank loan in the amount of $13.5
million to acquire the land. Interest is payable monthly at a rate of LIBOR plus
200 basis points or at the lender's  prime rate. The note matures April 1, 1999,
not including a six-month  extension option. The other joint venturer's interest
has been reflected as Minority Interest - Other at September 30, 1998.

On May 15, 1998, Prime obtained a 7.22% note payable with a principal balance of
$75.0  million,  collateralized  by a mortgage on the suburban  office  building
known as Continental  Towers. The note matures in 2013, with a prepayment option
in 2005,  and has monthly  payments of principal and  interest,  using a 25-year
principal  amortization  payment  schedule.  Prime  used  $70.0  million  of the
proceeds to repay a portion of the Credit Facility.  The remaining proceeds were
utilized to pay related costs and to fund escrow reserves  required by the terms
of the note.

On June 5, 1998,  Prime completed the sale of 4.0 million shares of its Series B
Cumulative   Redeemable   Preferred  Shares  and  received   proceeds,   net  of
underwriters'  discounts,  of approximately  $96.85 million,  which were used to
fund (i) the  acquisition of Two Century  Centre and Oak Brook Business  Center,
and (ii)  repay  borrowings  under the Credit  Facility  and the Line of Credit.
Distributions on the Series B Redeemable  Preferred Shares are payable quarterly
on or about the last day of January,  April,  July and October of each year,  at
the rate of 9% (equivalent to $2.25 per annum per Series B Cumulative Redeemable
Preferred  Share).  The Series B  Cumulative  Redeemable  Preferred  Shares rank
senior to Prime's common shares and its Series A Convertible Preferred Shares as
to the payment of dividends and as to the  distribution of assets.  On and after
June 5,  2003,  the  Series B  Cumulative  Redeemable  Preferred  Shares  may be
redeemed  at  Prime's  option at a  redemption  price of $25.00  per share  plus
accrued and unpaid distributions.  The redemption price is payable solely out of
the proceeds from the sale of other Prime capital shares of beneficial interest.

In July 1998 and September 1998,  respectively,  Prime began  construction of an
industrial  facility  with  approximately  242,000  square  feet  and an  office
building with approximately 33,000 square feet on the Libertyville land parcels.

On August 21, 1998 and August 25, 1998,  Prime  entered  into two Treasury  Lock
agreements with two financial  institutions to determine the interest rate on 10
year  Treasury  notes  effective  on the  date of the  agreements.  One of these
agreements was entered into in anticipation  of a planned future  securitization
of a $170.0  million loan related to the 77 West Wacker Drive property (see Note
9). The other  agreement was entered into in anticipation of debt related to the
acquisition of the IBM Plaza and National City Center properties (see discussion
below).  One of the  agreements  expires  on  December  21,  1998 and the  other
agreement  expires on February 18, 1999.  Prime has made deposits as required by
the  agreements  which are included in other assets at September 30, 1998 and if
the yield on the U.S.  ten-year  Treasury  note at  settlement  is less than the
locked yield, the calculated notional amount will be amortized over the terms of
the future debt instruments as an adjustment to interest expense.  Prime intends
to consummate debt transactions equal to the notional value of the agreements.

During the quarter  ended  September 30, 1998,  Prime entered into  contracts to
acquire two land parcels and an option to acquire a third land parcel located in
the Chicago  metropolitan area for a total purchase price of approximately $62.0
million.  Restricted  cash escrows at September  30, 1998  includes  deposits of
approximately  $10.2  million  related  to these  contracts.  Prime  expects  to
complete  the above  acquisitions  by the first  quarter of 1999.  However,  the
purchase of the  acquisitions is subject to Prime's  completion of due diligence
and the satisfaction of other customary  closing  conditions and there can be no
assurance that any or all of the acquisitions will be completed.

                                      -11-
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
           AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)

       NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS - CONTINUED
                                   (UNAUDITED)

5.    RECENT DEVELOPMENTS (CONTINUED)

On July 22, 1998, Prime entered into a purchase  agreement to acquire two office
buildings  (IBM Plaza and National City Center) for an aggregate  purchase price
of  approximately  $357.0 million.  On September 15, 1998,  Prime terminated the
purchase  agreement in accordance  with the terms of the agreement,  because the
sellers were unable to satisfy a material condition  precedent to the closing of
these acquisitions. On September 21, 1998, the sellers notified Prime in writing
that  they  believed  they were  entitled  to the $20.0  million  earnest  money
provided for by the agreement,  and instructed the earnest money escrow agent to
draw an aggregate of $20.0  million  under two earnest  money  letters of credit
provided by Prime under the terms of the purchase agreement.  In accordance with
such  instructions,  the earnest  money escrow agent drew down the earnest money
letters of credit and deposited the funds in an escrow account.  Pursuant to the
terms of the purchase agreement, these earnest money funds will remain deposited
in the escrow  account  until the  escrow  agent  receives a joint  disbursement
direction from Prime and the sellers or until a court of competent  jurisdiction
directs  the  disbursement  of the  escrow  funds in a final  order.  The escrow
agent's draw in the earnest money letters of credit, which were issued under the
Credit Facility,  increased Prime's  outstanding  indebtedness  under the Credit
Facility by such earnest  money funds.  Prime  believes that the sellers are not
entitled  to the  earnest  money and  intends  to  vigorously  pursue  available
remedies to obtain a return of these funds.  On September 21, 1998,  the sellers
filed a complaint  against Prime  alleging that Prime  breached the contract and
seeking,  among other things,  the earnest money now held in the escrow  account
(included in  restricted  cash escrows at September  30,  1998).  On October 30,
1998,  Prime  filed its answer to the above  complaint  and denied all  material
allegations  of the  complaint.  Prime also  filed a  counterclaim  against  the
sellers  alleging that the sellers  breached the contract and seeking the return
of the above mentioned  earnest money and other damages.  Although Prime intends
to vigorously defend this lawsuit and prosecute its counterclaim, the company is
unable to predict the outcome of this dispute.

On September 14, 1998, Prime established a program to repurchase up to 1,550,000
of its common shares in the open market and privately  negotiated  transactions.
As of September 30, 1998,  Prime had  repurchased  294,400  common shares for an
aggregate purchase price of approximately $4.0 million.

6.   RECENTLY ISSUED ACCOUNTING PRINCIPLES

In June 1998,  the  Financial  Accounting  Standards  Board issued  Statement of
Financial  Accounting  Standards No. 133, Accounting for Derivative  Instruments
and Hedging Activities , which is effective for all fiscal years beginning after
June 15, 1999. Statement No. 133 establishes  accounting and reporting standards
requiring that every  derivative  instrument be recorded in the balance sheet as
either an asset or a  liability  measured  at its fair value with the changes in
fair value recognized in earnings unless specific hedge accounting  criteria are
met. Prime intends to adopt Statement No. 133 in 2000.

Prime has not yet  quantified  the impact of adopting  Statement  No. 133 on its
financial  statements.  However,  Statement 133 could increase volatility in net
income and other comprehensive income.

                                      -12-
<PAGE>
                    PRIME GROUP REALTY TRUST (THE COMPANY)
           AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)

       NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS - CONTINUED
                                   (UNAUDITED)


7.   EARNINGS PER SHARE

The following  table sets forth the  computation of basic and diluted net income
available  per Prime's  weighted-average  common shares for the three months and
nine months ended September 30, 1998 (in thousands, except per share data):

<TABLE>
<CAPTION>
                                                 THREE MONTHS     NINE MONTHS
                                                    ENDED             ENDED
                                                SEPTEMBER 30,     SEPTEMBER 30,
                                                    1998              1998
                                               --------------    --------------
<S>                                            <C>               <C>
NUMERATOR:
  Net income available to common shares
    before extraordinary item................  $       2,837     $        8,035
  Extraordinary item.........................            ---               (525)
                                               -------------     --------------
  Numerator for basic earnings per share-
    income available to common shares........  $       2,837     $        7,510
                                               =============     ==============

DENOMINATOR:
  Denominator for basic and diluted
    earnings per share - weighted average
    common shares............................     15,535,023         14,771,655
                                               =============     ==============

  Basic and diluted earnings available to
    common shares per weighted average
    common share:
       Net income before extraordinary item..  $        0.18     $         0.54
       Extraordinary item....................           ---                (0.3)
                                               -------------     --------------

       Net income per common share...........  $        0.18     $         0.51
                                               =============     ==============
</TABLE>

Options to purchase  1,165,000 of Prime's  common  shares at a weighted  average
exercise price of $20.05 per share outstanding  during the three and nine months
ended  September  30,  1998,  were not  included in the  computation  of diluted
earnings per share because the conversion would be antidilutive.

Prime had  10,298,175  common units  outstanding  at September  30, 1998 held by
minority interests, of which 9,067,210 may be converted into common shares after
one year from the  completion  of Prime's IPO at the option of the company.  The
convertible  common  units  were not  included  in the  computation  of  diluted
earnings per share because the conversion would be antidilutive.

Prime had 2,000,000 Series A Convertible Preferred Shares outstanding during the
nine months ended September 30, 1998 which were not included in the computations
of diluted earnings per share because the conversion would be antidilutive.

8.   PRO FORMA CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

The  accompanying  unaudited  pro forma  condensed  consolidated  statements  of
operations  information  of Prime is  presented  as if, at January 1, 1997,  (i)
Prime had completed its IPO, the Series A  Convertible  Preferred  Share private
placement,  the Series B Cumulative  Redeemable  Preferred Share  offering,  the
common share private  placement and the sale of common units to Primestone Joint
Venture and used the net proceeds to acquire preferred units and common units of
the  Operating  Partnership,  (ii) PGI and  other  individuals  had  contributed
certain  of  their  respective   properties  and  operations  to  the  Operating

                                      -13-
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
           AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)

       NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS - CONTINUED
                                   (UNAUDITED)


8.   PRO FORMA CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (continued)

Partnership in exchange for common units of the Operating Partnership, (iii) the
Operating  Partnership  acquired  various  office and industrial  properties,  a
mortgage note  receivable and a property  management  company from various third
parties with cash and debt proceeds,  (iv) the Operating Partnership repaid debt
on certain of the contribution  properties and (v) the Operating Partnership had
borrowed  and repaid  certain  other debt.  The  unaudited  pro forma  condensed
consolidated  statements of operations information should be read in conjunction
with unaudited pro forma condensed  consolidated financial statements and all of
the  historical  financial  statements  contained in Form 10-K. In  management's
opinion, all adjustments  necessary to reflect the transactions  described above
have been made.

The  unaudited  pro  forma  condensed  consolidated   statements  of  operations
information of Prime is not necessarily indicative of what the actual results of
operations  would  have  been  assuming  the  transactions  described  above had
occurred at the dates indicated above, nor do they purport to present the future
results of operations of the company.

<TABLE>
<CAPTION>
                                                NINE MONTHS ENDED SEPTEMBER 30
                                               --------------------------------
                                                    1998                1997
                                               -------------      -------------
<S>                                            <C>                <C>
Total revenue (in 000's)                       $     119,379      $     106,608
                                               =============      =============
Net income (in 000's)                          $      15,132      $       5,645
                                               =============      =============
Net income (loss) available to common
  shareholders (in 000's)                      $       6,282      $      (3,205)
                                               =============      =============
Earnings (loss) per common share               $        0.41      $       (0.21)
                                               =============      =============
</TABLE>

9.   SUBSEQUENT EVENTS

On October 1, 1998,  Prime  entered  into a  non-recourse  mortgage  loan with a
financial  institution with a principal balance of $170.0 million and a maturity
of October 1, 1999. The loan bears  interest at LIBOR plus 1%,  payable  monthly
(interest  only),  is  collateralized  by a first mortgage on the 77 West Wacker
property and is subject to various agreement  covenants.  Proceeds from the loan
were used to repay  borrowings  under the Credit Facility and the Line of Credit
and provide working capital.

On October 1,  1998,  the Credit  Facility  was  amended to amend  certain  loan
covenant  compliance  provisions and to provide that the  commitments  under the
Credit  Facility be reduced to $80.0 million and the 77 West Wacker  property no
longer be included as collateral for the Credit Facility.

On October 21, 1998, Prime entered into three non-recourse mortgage loans with a
financial institution with total principal balances of $52.5 million. Two of the
loans bear  interest at a fixed rate of 7.375% and have  maturities  of November
11, 2008. The two loans require monthly payments of principal and interest,  are
collateralized  by a first mortgages on the two office buildings and are subject
to various agreement covenants. The third loan bears interest at LIBOR plus 2.5%
and if the  interest  rate exceeds  9.23%,  the company is required to obtain an
interest rate hedging  instrument  to lock the interest rate at 9.23%.  The loan
matures November 11, 2001, with options to extend the maturity for two, one year
periods,   requires   monthly   payments  of  principal   and  interest  and  is
collateralized  by a mortgage  note  receivable  held by the  company.  Prime is
subject  to  various  agreement  covenants  and has  provided  a  $10.0  million
guarantee to the note holder.  Prime intends to use the proceeds to fund working
capital needs and make future acquisitions.

                                      -14-
<PAGE>
ITEM 2:  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
         OF OPERATIONS.

OVERVIEW

Prime is a fully-integrated  real estate company providing property  management,
leasing,  marketing,  acquisition,  development,  redevelopment,   construction,
finance and other related services. Prime has filed as a REIT for federal income
tax  purposes.   As  of  September  30,  1998,   Prime  (through  the  Operating
Partnership) owns 24 office properties  containing an aggregate of approximately
5.8 million net rentable  square feet,  46 industrial  properties  containing an
aggregate  of  approximately  5.8 million net rentable  square feet,  one retail
center and one parking  facility.  The properties  are located  primarily in the
Chicago,  Illinois  metropolitan area. In addition,  Prime owns a mortgage on an
office property  containing  728,406 net rentable  square feet.  Prime also owns
approximately 225.5 acres (including a development site containing approximately
67,000  square feet  located in the Chicago CBD held by a joint  venture  with a
third party) and has rights to acquire  approximately 325.8 acres of developable
land (including  rights to acquire two development  sites located in the Chicago
CBD containing  approximately  119,000 square feet),  which management  believes
could be developed  with  approximately  5.4 million  square feet of  additional
office space and over 7.6 million  square feet of  additional  industrial  space
primarily in the Chicago metropolitan area.

In terms of net rentable square feet,  approximately 90.1% of the Prime's office
properties and 87.5% of the its industrial properties are located in the Chicago
metropolitan  area in  prime  business  locations  within  established  business
communities. The properties located in the Chicago metropolitan area account for
approximately 95.6% of Prime's rental revenue and tenant  reimbursement  revenue
for  the  nine  months  ended  September  30,  1998.  Prime's  remaining  office
properties are located in Nashville,  Tennessee;  Knoxville,  Tennessee; and the
Milwaukee, Wisconsin metropolitan areas, and the remaining industrial properties
are located in the Columbus,  Ohio metropolitan  area. Prime intends to continue
to  invest in the  acquisition,  development  and  redevelopment  of office  and
industrial properties primarily located in the Chicago metropolitan area.

Prime intends to access multiple  sources of capital to fund future  acquisition
and development activities. These capital sources may include undistributed cash
flow,  borrowings  under  certain  acquisition  facilities,  proceeds  from  the
issuance of long-term,  tax-exempt bonds,  joint venture  arrangements and other
debt or equity securities and other bank and/or institutional borrowings.  There
can be no assurance that any such financing will be obtained.

CAUTIONARY STATEMENTS

The following  discussion in "Management's  Discussion and Analysis of Financial
Condition and Results of Operations" contains certain forward-looking statements
within the meaning of the Private Securities Litigation Reform Act of 1995 which
reflect  management's  current view with respect to future  events and financial
performance.  Such  forward-looking  statements are subject to certain risks and
uncertainties,  including,  but not limited to, the effects of future  events on
Prime's financial performance;  the risk that Prime may be unable to finance its
planned acquisition and development activities;  risks related to the industrial
and office industry in which Prime's properties compete, including the potential
adverse  impact of external  factors  such as  inflation,  consumer  confidence,
unemployment  rates and consumer tastes and  preferences;  risks associated with
Prime's development activities,  such as the potential for cost overruns, delays
and lack of predictability with respect to the financial returns associated with
these development activities;  the risk of potential increase in market interest
rates from current rates; and risks associated with real estate ownership,  such
as the potential  adverse impact of changes in the local economic climate on the
revenues and the value of Prime's properties.

                                      -15-
<PAGE>
RESULTS OF OPERATIONS

Comparison  of the Three Months Ended  September  30, 1998 of the Company to the
Three Months Ended September 30, 1997 of the Predecessor Properties
- --------------------------------------------------------------------------------

In analyzing the operating results for the quarter ended September 30, 1998, the
changes in rental and reimbursable  income,  property operating  expenses,  real
estate taxes and depreciation and amortization  from 1997 are due principally to
the addition of operating  results from  properties  contributed and acquired as
part of  Prime's  IPO as well  as  properties  acquired  after  its IPO  through
September 30, 1998.

The Predecessor  Properties  consisted of five office properties,  17 industrial
properties,  as well as a  parking  facility.  At the time of  Prime's  IPO,  11
additional office properties, 28 additional industrial properties and one retail
center  were  contributed  or  acquired.  After the date of its IPO and  through
September 30, 1998,  Prime  acquired ten  additional  office  properties and the
first  mortgage  note  encumbering  one  office  property  as  described  in the
footnotes to Prime's Form 10-K.

For the three  months  ended  September  30,  1998,  rental  revenue  and tenant
reimbursements  income  increased  $24.8 million,  or 195.3%,  to $37.5 million,
other  revenue  increased  $2.1  million  to $2.3  million,  property  operating
expenses and real estate tax expense  increased  $10.8  million,  or 225.1%,  to
$15.7 million, and depreciation and amortization expense increased $2.5 million,
or 62.3%,  to $6.6 million as compared to the three months ended  September  30,
1997.  The primary  reason for the  increases  in the above  revenue and expense
categories  was the  acquisition of new office and  industrial  properties  made
since Prime's IPO. The additional office and industrial  properties  resulted in
total rental revenue and tenant  reimbursements  income of $27.3 million,  other
revenue of $2.1 million, property operating expenses and real estate tax expense
of $12.7 million and depreciation  and amortization  expense of $3.4 million for
the three  months  ended  September  30,  1998.  Included in the rental  revenue
increase  is a  $1.7  million  lease  termination.  Rental  revenue  and  tenant
reimbursement  income for the Predecessor  Properties decreased $2.4 million for
the three months ended  September  30, 1998 compared to the same period in 1997,
primarily due to a change in tenant  reimbursements  income as a result of lower
than anticipated real estate tax expense in the third quarter of 1998.  Property
operating  expenses and real estate tax expense for the  Predecessor  Properties
decreased $1.9 million for the three months ended September 30, 1998 compared to
the same period in 1997 primarily due to a change in anticipated real estate tax
expense in the third quarter of 1998.  Depreciation and amortization expense for
the  Predecessor  Properties  decreased  $0.9 million for the three months ended
September  30, 1998  compared to the same  period in 1997  primarily  due to the
elimination  of  amortization  of  deferred   financing  costs  associated  with
Predecessor Properties' debt that was either repaid or forgiven at Prime's IPO.

Mortgage note interest  income  increased by $1.4 million to $1.4 million due to
the acquisition of the first mortgage note encumbering the property known as 180
North LaSalle in December 1997.

Interest  expense had a net decrease of $2.2 million,  or 22.8%, to $7.6 million
during the three months ended September 30, 1998. The decrease was due to a $6.7
million  increase due to mortgages  obtained on certain of the properties  which
were  contributed or acquired after the IPO, as well as Credit Facility and Line
of  Credit  borrowings  used to fund  property  acquisitions,  offset  by a $8.9
million decrease as a result of the repayment of debt with proceeds from Prime's
IPO.

General and  administrative  expense  increased  $0.6  million  during the three
months ended September 30, 1998,  reflecting costs related to Prime's new public
status and its increased size.

The decrease in financing fees and property and asset  management fees is due to
these fees being  incurred by the  Predecessor  Properties  under their previous
ownership and the costs are no longer incurred by Prime.

Income allocated to minority interest increased $4.0 million to $3.9 million for
the three months ended  September  30, 1998  compared to the same period in 1997
due to an increase in income  before  minority  interest  of $17.2  million,  or
228.8%, to $9.7 million and a change in the ownership structure. The increase in
income before  minority  interest is due to additional  properties  either being
contributed  or  acquired  and the  effects  they had on  revenue  and  expenses
described above. The change in ownership  structure is due to certain  ownership
percentages changing during the IPO.

                                      -16-
<PAGE>
Net income  increased  $13.2 million,  or 178.0%,  to $5.8 million for the three
months ended  September  30, 1998 compared to the same period in 1997 due to the
changes in revenue, expenses and minority interest described above.

Comparison  of the Nine Months  Ended  September  30, 1998 of the Company to the
Nine Months Ended September 30, 1997 of the Predecessor Properties
- --------------------------------------------------------------------------------

In analyzing the operating results for the nine months ended September 30, 1998,
the changes in rental and reimbursable income, property operating expenses, real
estate taxes and depreciation and amortization  from 1997 are due principally to
the addition of operating  results from  properties  contributed and acquired as
part of  Prime's  IPO as well  as  properties  acquired  after  its IPO  through
September 30, 1998.

For the nine  months  ended  September  30,  1998,  rental  revenue  and  tenant
reimbursements  income  increased  $60.8 million,  or 166.1%,  to $97.4 million,
other  revenue  increased  $4.2  million  to $5.1  million,  property  operating
expenses and real estate tax expense  increased  $25.1  million,  or 170.0%,  to
$39.9 million, and depreciation and amortization expense increased $7.6 million,
or 72.1%,  to $18.2  million as compared to the nine months ended  September 30,
1997.  The primary  reason for the  increases  in the above  revenue and expense
categories  was the  acquisition of new office and  industrial  properties  made
since Prime's IPO. The additional office and industrial  properties  resulted in
total rental revenue and tenant  reimbursements  income of $63.1 million,  other
revenue of $4.2 million, property operating expenses and real estate tax expense
of $27.0 million and depreciation  and amortization  expense of $8.8 million for
the nine  months  ended  September  30,  1998.  Rental  revenue  and  tenant
reimbursement  income for the Predecessor  Properties decreased $2.3 million for
the nine months ended  September  30, 1998  compared to the same period in 1997,
primarily due to a major tenant of the 77 West Wacker Drive building  defaulting
on its lease in the second quarter of 1997 and a change in tenant reimbursements
income as a result of lower than  anticipated  real  estate  tax  expense in the
third quarter of 1998.  Property  operating expenses and real estate tax expense
for the Predecessor  Properties decreased $1.9 million for the nine months ended
September 30, 1998 compared to the same period in 1997 primarily due to a change
in  anticipated   real  estate  tax  expense  in  the  third  quarter  of  1998.
Depreciation and amortization  expense for the Predecessor  Properties decreased
$1.1 million for the nine months ended  September  30, 1998 compared to the same
period in 1997  primarily due to the  elimination  of  amortization  of deferred
financing costs  associated with  Predecessor  Properties'  debt that was either
repaid or forgiven at Prime's IPO.

Mortgage note interest  income  increased by $4.4 million to $4.4 million due to
the acquisition of the first mortgage note encumbering the property known as 180
North LaSalle in December 1997.

Interest expense had a net decrease of $7.0 million,  or 24.1%, to $22.1 million
during the nine months ended September 30, 1998. The decrease was due to a $19.5
million  increase due to mortgages  obtained on certain of the properties  which
were  contributed or acquired after the IPO, as well as Credit Facility and Line
of  Credit  borrowings  used to fund  property  acquisitions,  offset by a $26.5
million decrease as a result of the repayment of debt with proceeds from Prime's
IPO.

General and administrative expense increased $1.7 million during the nine months
ended September 30, 1998,  reflecting costs related to Prime's new public status
and its increased size.

The decrease in financing fees and property and asset  management fees is due to
these fees being  incurred by the  Predecessor  Properties  under their previous
ownership and the costs are no longer incurred by Prime.

In 1997,  the  Predecessor  Properties  recorded a provision  for  environmental
remediation  costs of $3.2  million as an estimate  of costs to be incurred  for
environmental  clean-up  of certain  properties.  In  management's  opinion,  no
additional provision is necessary.

Income allocated to minority interest increased $9.5 million to $9.1 million for
the nine months ended September 30, 1998 compared to the same period in 1997 due
to an increase in income before minority  interest of $47.2 million,  or 188.0%,
to $22.1 million and a change in the ownership structure. The increase in income

                                      -17-
<PAGE>
before  minority   interest  is  due  to  additional   properties  being  either
contributed  or  acquired  and the  effects  they had on  revenue  and  expenses
described  above.  The  change  in  ownership  structure  is due to the  certain
ownership percentages changing during Prime's IPO.

Net income  increased  $37.1 million,  or 150.7%,  to $12.5 million for the nine
months ended  September  30, 1998 compared to the same period in 1997 due to the
changes in revenue, expenses and minority interest described above.

LIQUIDITY AND CAPITAL RESOURCES

     THE CREDIT FACILITY.  As of September 30, 1998, Prime has a Credit Facility
of $190.0 million from a group of financial  institutions.  Borrowings under the
Credit Facility are available to fund  acquisitions  and development  activities
and to provide  letters of credit for $26.0  million of  tax-exempt  bonds.  The
Credit Facility,  which matures on November 17, 2000, was  collateralized by the
77 West Wacker Building and all of Prime's  properties  located in Tennessee and
was secured by a pledge of the Company's mortgage note receivable on Continental
Towers until May 15, 1998 when the Company  repaid  $70.0  million of the Credit
Facility in connection with obtaining the $75.0 million loan  collateralized  by
Continental  Towers  described below under "1998 Mortgage  Notes".  Concurrently
with the loan  transaction,  the Credit Facility was reduced from $200.0 million
to $190.0 million. On October 1, 1998, Prime repaid $123.0 million of the Credit
Facility in connection  with  obtaining a $170.0 million  non-recourse  mortgage
loan collateralized by a first mortgage on the 77 West Wacker Building described
below under "1998 Mortgage Notes".  Concurrently with the loan transaction,  the
Credit  Facility was further  amended to amend certain loan covenant  compliance
provisions and provide that the commitments under the Credit Facility be reduced
to $80.0  million  and the 77 West  Wacker  property  no longer be  included  as
collateral for the Credit Facility.

The Credit Facility, at Prime's election,  bears interest on Eurodollar loans at
a floating rate based on a spread over the  Eurodollar  rate equal to 120 to 150
basis points,  depending upon the Company's  applicable  leverage  ratio, or the
higher of the financial  institution's prime rate or the federal funds rate plus
50 basis points.  Notwithstanding the foregoing, the Credit Facility was amended
to provide that for the period from December 15, 1997 through February 14, 1998,
the spread over the Eurodollar rate applicable to Eurodollar  loans was equal to
175 basis points and for the period from February 15, 1998 through May 15, 1998,
such spread was equal to 200 basis points.  Borrowings under the Credit Facility
may be repaid at any time, without penalty,  except for the costs related to the
breakage of the  Eurodollar  rate loan,  if any.  The Credit  Facility  requires
monthly  payments  of  interest  only on prime rate and  Eurodollar  rate loans.
Eurodollar  rate  loans  may be for  periods  of  between  30 and 180  days.  At
September  30, 1998  borrowings  under the Credit  Facility  bore  interest at a
weighted-average rate equal to 7.25%.

Prime's  ability to borrow under the Credit Facility is subject to the company's
ongoing  compliance with a number of financial and other  covenants.  The Credit
Facility,  except under certain  circumstances,  limits Prime's  ability to make
distributions in excess of 90% of its annual funds from operations.

     NEW MORTGAGE  NOTES.  Prime borrowed  $83.5 million in aggregate  principal
amount  under the New Mortgage  Notes.  The New  Mortgage  Notes  consist of two
separate notes secured,  respectively,  by first mortgages on certain office and
industrial properties. Prior to their refinancing,  interest on the New Mortgage
Notes was fixed to 7.19% (a rate equal to seven-year U.S.  Treasury Notes,  plus
1.27%). On March 23, 1998, Prime refinanced one of the New Mortgage Notes (which
had an  original  principal  balance  of  $27.5  million)  with a loan of  $29.4
million,  which will mature on April 1, 2008. Interest on this loan accrues at a
rate of 6.85% and is payable monthly. The remaining New Mortgage Note (which had
an original  principal  balance of $56.0  million) was refinanced on May 1, 1998
with two loans,  the first of which is a $47.0  million loan which has principal
and interest payable monthly, using a 30-year amortization period, with interest
fixed at 7.17%  and will  mature  on May 1,  2008.  The  second  loan is a $14.6
million  loan which has interest  only payable  monthly at 150 basis points over
LIBOR or 0.50% plus the greater of (a) the lender's  U.S.  prime rate or (b) the
Federal  Funds rate plus 1.0% and will  mature on May 1, 2001,  not  including a
six-month  extension  option.  The refinanced notes are  collateralized by first
mortgages on certain office and industrial properties.  As a result of the above
refinancing, Prime recognized an extraordinary item of $525,000, net of minority
interest of  $375,000,  representing  the  write-off of  previously  unamortized
deferred financing fees.

                                      -18-
<PAGE>
     LINE OF CREDIT.  In January 1998, Prime obtained a $15.0 million  revolving
line of credit with LaSalle National Bank. The Line of Credit,  which matures in
January 1999 and is subject to a one-year  extension at the Company's option, is
collateralized  by  an  industrial   property  known  as  475  Superior  Avenue.
Outstanding  balances  under the Line of Credit bear interest at a rate equal to
LIBOR plus 195 basis points.  Generally,  the covenants contained in the Line of
Credit are identical to the covenants contained in the Credit Facility.

     1998 MORTGAGE NOTES.  During 1998, Prime has acquired five of its eight new
office properties with proceeds from property mortgage loans. The following is a
summary of those loans:

<TABLE>
<CAPTION>
                           INITIAL
                          PRINCIPAL              INTEREST
      PROPERTY          (IN MILLIONS)             RATE (%)             MATURITY
- --------------------   ---------------   ---------------------------   --------
<S>                    <C>               <C>                           <C>
33 North Dearborn      $         18.0    LIBOR plus 165 basis points    1/2000
Commerce Point                   20.0              7.070                2/2008
208 South LaSalle                45.8              7.785                4/2008
2100 Swift Drive                  5.2              7.190                5/2028
6400 Shafer Court                14.4              7.090                5/2028
                       --------------
                       $        103.4
                       ==============
</TABLE>
Except for the loan  relating  to 33 North  Dearborn,  all of the loans  require
monthly payments of principal and interest.  The 33 North Dearborn loan requires
monthly payments of interest only.

On May 15, 1998,  Prime  obtained a 7.22% note  payable,  collateralized  by the
company's  note  receivable  encumbering  a suburban  office  building  known as
Continental Towers, with a principal balance of $75.0 million.  The note matures
in 2013, with a prepayment option in 2005, and has monthly payments of principal
and interest,  using a 25-year principal  amortization  payment schedule.  Prime
used $70.0 million of the proceeds to repay a portion of the Credit Facility.

On October 1, 1998,  Prime  entered  into a  non-recourse  mortgage  loan with a
financial  institution with a principal balance of $170.0 million and a maturity
of October 1, 1999. The loan bears  interest at LIBOR plus 1%,  payable  monthly
(interest  only),  is  collateralized  by a first mortgage on the 77 West Wacker
Building and is subject to various agreement  covenants.  Proceeds from the loan
were used to repay borrowings under the Credit Facility,  the Line of Credit and
to provide working capital.

On October 21, 1998, Prime entered into three non-recourse mortgage loans with a
financial institution with total principal balances of $52.5 million. Two of the
loans bear  interest at a fixed rate of 7.375% and have  maturities  of November
11, 2008. The two loans require monthly payments of principal and interest,  are
collateralized  by a first mortgages on the two office buildings and are subject
to various agreement covenants. The third loan bears interest at LIBOR plus 2.5%
and if the  interest  rate exceeds  9.23%,  the company is required to obtain an
interest rate hedging  instrument  to lock the interest rate at 9.23%.  The loan
matures on  November  11,  2001  (with  options to extend for up to two one year
periods),   requires   monthly   payments  of  principal  and  interest  and  is
collateralized  by a mortgage  note  receivable  held by the  company.  Prime is
subject  to  various  agreement  covenants  and has  provided  a  $10.0  million
guarantee to the note holder.  Prime intends to use the proceeds to fund working
capital needs and make future acquisitions.

     INTEREST  RATE  PROTECTION  AGREEMENTS.  On August 21,  1998 and August 25,
1998,  Prime  entered  into two  Treasury  Lock  agreements  with two  financial
institutions  to determine the interest rate on 10 year Treasury notes effective
on the date of the swap agreements.  One of these agreements was entered into in
anticipation of a planned future securitization of a $170.0 million loan related
to the 77 West  Wacker  Drive  property  (see note 9). The other  agreement  was
entered into in anticipation of debt related to the acquisition of the IBM Plaza
and  National  City  Center  properties  (see  discussion  below).  One  of  the
agreements  expires on  December  21,  1998 and the other  agreement  expires on
February 18, 1999.  Prime has made deposits as required by the agreements  which
are included in other assets at September  30, 1998 and if the yield on the U.S.
ten-year  Treasury  note at  settlement  is less  than  the  locked  yield,  the
calculated  notional  amount will be amortized  over the term of the future debt
instruments  as an adjustment to interest  expense.  Prime intends to consummate
debt transactions equal to the notional value of the agreements.

                                      -19-
<PAGE>
Prime has made  deposits  as required by the  agreements  which are  included in
other assets at September 30, 1998 and which will be amortized over the terms of
the future debt instruments as an adjustment to interest  expense.  The deposits
related to any unused swap agreements will be expensed if the agreements  expire
unused and are not extended.

     LETTERS OF CREDIT.  Prime has refinanced $48.8 million of letters of credit
that provided credit enhancements on certain of the company's bonds payable from
the Credit Facility to the new letters of credit. The new letters of credit have
a annual fee of 1.4% of the face amount and are  collateralized  by mortgages on
certain  industrial  and office  properties  and a $5.0 million cash  collateral
account.

     ANALYSIS OF  LIQUIDITY  AND CAPITAL  RESOURCES.  Prime  expects to meet its
short-term liquidity  requirements generally through its working capital and net
cash provided by operations.  The  properties  require  periodic  investments of
capital  for  tenant-related   capital  expenditures  and  for  general  capital
improvements.  Prime  expects that the average  annual cost of recurring  tenant
improvements and leasing commissions will be approximately $3.6 million based on
an average  annual  square feet for which  leases  expire  during the next three
years. Prime expects the cost of general capital  improvements to the properties
to average  approximately  $0.9 million annually based upon an estimate of $0.08
per square foot.

Prime expects to meet its long-term  liquidity  requirements  for the funding of
property  development,  property  acquisitions and other  non-recurring  capital
improvements through long-term secured and unsecured indebtedness (including the
Credit Facility), joint venture agreements and the issuance of additional equity
securities  from the  company.  The terms of the Credit  Facility,  the Series A
Convertible  Preferred Shares and the Series B Cumulative  Redeemable  Preferred
Shares impose  restrictions on Prime's ability to incur  indebtedness  and issue
additional preferred shares.

HISTORICAL CASH FLOWS

In analyzing cash flows for the quarter ended September 30, 1998, the changes in
1997  are  due  principally  to the  addition  of  cash  flows  from  properties
contributed  and acquired as part of Prime's IPO as well as properties  acquired
after its IPO through September 30, 1998.

Prime had net cash provided by (used in)  operating  activities of $53.7 million
and $ (10.0)  million for the nine  months  ended  September  30, 1998 and 1997,
respectively.  The $63.7  million  increase is primarily  due to a $37.1 million
increase in net income, a $7.6 million increase in depreciation and amortization
expense,  a $9.5 million  increase in income allocated to minority  interest,  a
$2.8 million decrease in tenant receivables, a $1.6 million decrease in deferred
costs,  a $1.0  million  increase in accrued  interest  payable,  a $2.3 million
increase in accounts payable and accrued  expenses,  a $14.2 million increase in
accrued real estate  taxes,  and a $4.4 million  increase in other  liabilities,
offset  by a $9.0  million  decrease  in  interest  expense  and  fees  added to
principal  on  mortgage  note  payable  affiliate,  a $1.3  million  increase in
deferred rent receivables, and a $7.0 million increase in other assets.

Prime  had net cash used in  investing  activities  of $335.6  million and $ 1.5
million for the nine months ended September 30, 1998 and 1997, respectively. The
$334.1 million increase in net cash used in investing activities from the period
ended  September 30, 1997 as compared to the period ended September 30, 1998 was
primarily due to an $277.7 million  increase in expenditures for real estate and
equipment, principally related to the acquisition of eight office properties and
six land parcels,  $46.6 million increase in escrow deposits, a $5.6 million net
increase in advances  to  affiliates,  $2.1  million in  additional  advances to
mortgage note receivable and a $2.2 million increase in leasing costs.

Prime had net cash provided by financing  activities of $278.1  million and $8.4
million for the nine months ended September 30, 1998 and 1997, respectively. The
$269.1 million  increase in net cash provided by financing  activities  from the
period ended  September  30, 1997 as compared to the period ended  September 30,
1998 was due to net proceeds of $94.4  million from Prime's sale of its Series B
Cumulative  Redeemable Preferred Shares during 1998, net proceed of 47.2 million
from  Prime's sale common  shares  during  1998,  net  proceeds  from the Credit
Facility and mortgage notes payable of $291.7  million and  additional  minority
interest  contributions  of $1.0  million,  offset  by financing  costs of $19.5
million,  repayments of the Credit Facility and mortgage notes payable of $108.9
and distributions to preferred  shareholders,  common  shareholders and minority
interest of $23.7 million.

                                      -20-
<PAGE>
FUNDS FROM OPERATIONS

Industry analysts  generally  consider funds from operations,  as defined by the
National  Association of Real Estate  Investment  Trusts,  Inc.  ("NAREIT"),  an
alternative  measure of performance of an equity REIT.  Funds from operations is
defined by NAREIT to mean net income (loss)  determined in accordance with GAAP,
excluding gains (or losses) from debt restructuring and sales of property,  plus
depreciation and  amortization  (other than  amortization of deferred  financing
costs and  depreciation  of non-real  estate  assets) and after  adjustment  for
unconsolidated  partnerships and joint ventures. Prime believes that in order to
facilitate a clear understanding of the combined historical operating results of
the company,  funds from operations  should be examined in conjunction  with net
income  (loss) as  presented  in the  unaudited  financial  statements  included
elsewhere  in this Form 10-Q.  The  following  table  represents  the  unaudited
calculation of Prime's funds from operations for the nine months ended September
30, 1998 (in thousands):
<TABLE>
<S>                                                               <C>
Net income allocated to common shareholders.................      $       7,510

       Real estate depreciation and amortization............             16,955
       Amortization of costs for leases assumed.............                852
       Straight-line rental revenue adjustments.............             (1,053)
       Minority interest....................................              9,069
       Extraordinary loss...................................                525
                                                                  -------------

Funds from operations (1)...................................      $      33,858
                                                                  =============
</TABLE>

(1)  Prime  computes  funds  from   operations  in  accordance   with  standards
     established  by the Board of  Governors  of NAREIT in its March  1995 White
     Paper (with the exception  that the company  reports  rental  revenues on a
     cash basis (based on contractual lease terms),  rather than a straight-line
     GAAP basis, which Prime believes results in a more accurate presentation of
     its actual operating activities), which may differ from the methodology for
     calculating  funds from  operations  used by certain  other  office  and/or
     industrial  REITs and,  accordingly,  may not be  comparable  to such other
     REITs.  As a result of Prime's  reporting  rental revenues on a cash basis,
     contractual  rent increases  will cause  reported funds from  operations to
     increase.  Further,  funds  from  operations  does  not  represent  amounts
     available  for  management's  discretionary  use because of needed  capital
     replacement or expansion, debt repayment obligations,  or other commitments
     and  uncertainties.  Funds from  operations  should not be considered as an
     alternative to net income (loss),  as an indication of Prime's  performance
     or to cash flows as a measure of liquidity or the ability to pay  dividends
     or make distributions.

READINESS FOR YEAR 2000

Prime is currently evaluating the nature and extent of the work required to make
its  systems  and  infrastructure  Year  2000  compliant.   Based  on  a  recent
assessment,  Prime will have to modify or replace  significant  portions  of its
hardware and software so that its systems will function properly with respect to
the Year 2000 and beyond.  Certain of these systems are currently in the process
of being modified and/or  replaced.  Prime believes that with  modifications  to
certain  existing  software and  conversions  to new software  applications,  in
addition to hardware upgrades on certain mechanical systems, the Year 2000 issue
will not pose significant  operational problems.  However, if such modifications
and conversions are not made, or are not completed in a timely manner,  the Year
2000 issue could have a material impact on Prime's operations.

                                      -21-
<PAGE>
Prime's plan to resolve the Year 2000 issues involves three phases:  assessment,
remediation  and  implementation.  To  date,  Prime  has  completed  75%  of the
assessment phase and 25% of the remediation phase. Prime expects to complete the
remainder  of the  assessment  and  remediation  phases by early to mid 1999 and
complete the implementation  phase by mid 1999. Prime will utilize both internal
and external  resources in order to upgradw and remediate,  or replace,  systems
that are not in  compliance  with the Year 2000.  Prime has  estimated the total
cost for its Year 2000 project to be $2.5  million.  Of the total  project cost,
Prime estimates  approximately  $2.0 million is attributable to the purchase and
implementation  of new software and equipment  which will be capitalized and the
remainder  relates to the  assessment,  modifications  to existing  hardware and
software, and training which will be expensed as incurred.

Prime  currently  has no  contingency  plans in  place in the  event it does not
complete all phases of the Year 2000 program. Prime plans to evaluate the status
of completion in early 1999 and determine whether such a plan is necessary.

Prime is in the process of querying its  significant  vendors and tenants  about
their Year 2000 compliance status. To date, Prime is not aware of any vendors or
tenants  with a year  2000  issue  that  would  have a  material  impact  on the
company's results of operations,  liquidity or capital resources. However, Prime
has no means of ensuring  that its  vendors or tenants  will be Year 2000 ready.
The  inability  of these  vendors  and  tenants  to  complete  their  Year  2000
resolution process in a timely fashion could materially impact the company.  The
effect of non-compliance by significant vendors and tenants is not determinable.
Prime will continue to monitor its significant vendors' and tenants' compliance.

Prime's management  believes it has an effective program in place to resolve the
Year 2000 issue in a timely  manner.  The  project  completion  date is based on
management's best estimates,  which were derived utilizing numerous  assumptions
of future  events,  including  the  ability of third  parties to modify  Prime's
systems on a timely  basis.  There can be no guarantee  that the project will be
completed in a timely manner.  Specific  factors that might delay  completion of
the  project  include,  but are not limited to, the  availability  of  qualified
personnel,  the  ability to locate and  correct  relevant  computer  codes,  the
complexity of  implementation  of new hardware and  software,  hardware/software
availability and similar uncertainties.

INFLATION

Prime's leases with the majority of its tenants  require the tenants to pay most
operating expenses,  including real estate taxes and insurance, and increases in
common  area  maintenance  expenses,  which  reduce the  company's  exposure  to
increases  in costs and  operating  expenses  resulting  from  inflation.  As of
September 30, 1998,  approximately $259.3 million in principal amount of Prime's
indebtedness  bore interest at floating rates and future  indebtedness  may bear
floating rate interest.  Inflation,  and its impact on floating  interest rates,
could affect the amount of interest payments due on such indebtedness.

ITEM 3:  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

       Not applicable.




                                      -22-
<PAGE>
PART II:  OTHER INFORMATION

ITEM 1. Legal Proceedings.

Except  as  discussed  in the  following  paragraph,  neither  Prime nor any our
properties is subject to any material litigation,  nor to Prime's knowledge,  is
any  material  litigation  threatened  against  any  them,  other  than  routine
litigation arising in the ordinary course of business, much of which is expected
to be  covered  by  liability  insurance.  Prime  has sued  various  parties  in
connection  with   environmental   remediation  at  certain  of  its  industrial
properties.

On July 22, 1998, Prime entered into a purchase  agreement to acquire two office
buildings  (IBM Plaza and National City Center) for an aggregate  purchase price
of  approximately  $357.0 million.  On September 15, 1998,  Prime terminated the
purchase  agreement in accordance  with the terms of the agreement,  because the
sellers were unable to satisfy a material condition  precedent to the closing of
these acquisitions. On September 21, 1998, the sellers notified Prime in writing
that  they  believed  they were  entitled  to the $20.0  million  earnest  money
provided for by the agreement,  and instructed the earnest money escrow agent to
draw an aggregate of $20.0  million  under two earnest  money  letters of credit
provided by Prime under the terms of the purchase agreement.  In accordance with
such  instructions,  the earnest  money escrow agent drew down the earnest money
letters of credit and deposited the funds in an escrow account.  Pursuant to the
terms of the purchase agreement,  such earnest money funds will remain deposited
in the escrow  account  until the  escrow  agent  receives a joint  disbursement
direction from Prime and the sellers or until a court of competent  jurisdiction
directs  the  disbursement  of the  escrow  funds in a final  order.  The escrow
agent's draw in the earnest money letters of credit, which were issued under the
Credit Facility,  increased Prime's  outstanding  indebtedness  under the Credit
Facility by such earnest  money funds.  Prime  believes that the sellers are not
entitled  to the  earnest  money and  intends  to  vigorously  pursue  available
remedies  to  obtain a return  of the  earnest  money  deposited  in the  escrow
account.  On September  21, 1998,  the sellers  filed a complaint  against Prime
alleging that Prime breached the contract and seeking,  among other things,  the
earnest  money now held in the  escrow  account  (which  amount is  included  in
restricted cash escrow at September 30, 1998). On October 30, 1998,  Prime filed
its answer to the above  complaint  and denied all material  allegations  of the
complaint. Prime also filed a counterclaim against the sellers alleging that the
sellers  breached  the  contract  and seeking the return of the above  mentioned
earnest money and other  damages.  Although  Prime intends to vigorously  defend
this lawsuit and  prosecute its  counterclaim,  the company is unable to predict
the outcome of this dispute.

ITEM 2. Changes in Securities and Use of Proceeds.

On September 14, 1998, Prime established a program to repurchase up to 1,550,000
of its common shares in the open market and privately  negotiated  transactions.
As of September 30, 1998, Prime had repurchased 259,400 of its common shares for
an aggregate purchase price of approximately $4.0 million.

ITEM 3. Defaults Upon Senior Securities.

        None.

ITEM 4. Submission of Matters to a Vote of Security Holders.

        None.

ITEM 5. Other Information.

        None.

                                      -23-
<PAGE>
ITEM 6. Exhibits and Reports on Form 8-K.

(a)     Exhibits:

  EXHIBIT
  NUMBER                                DESCRIPTION
- ----------    ------------------------------------------------------------------

    3.1       Amendment  No.  11  to  the  Amended  and  Restated  Agreement of
              Limited Partnership dated as of July 15, 1998

    3.2       Amendment No. 12 to the Amended and Restated Agreement of Limited
              Partnership dated as of August 15, 1998

    3.3       Amendment No. 13 to the Amended and Restated  Agreement of Limited
              Partnership  dated as of September 15, 1998

   12.1       Computation of Ratios of Earnings to Fixed Charges and Preferred
              Share Distributions

   27.1       Financial Data Schedule

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

(b)     Reports on Form 8-K:

        None.








                                     -24-
<PAGE>
                                   SIGNATURES

Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.

                                           PRIME GROUP REALTY TRUST
                                           ------------------------
                                           Registrant


Date:        November 16, 1998             /s/  Richard S. Curto
     --------------------------------      ---------------------
                                           Richard S. Curto
                                           President and Chief Executive Officer

Date:        November 16, 1998             /s/  William M. Karnes
     --------------------------------      ----------------------
                                           William M. Karnes
                                           Executive Vice President and
                                           Chief Financial Officer

                                      -25-

                    AMENDMENT NO. 11 TO AMENDED AND RESTATED
                        AGREEMENT OF LIMITED PARTNERSHIP
                           OF PRIME GROUP REALTY, L.P.

     This  AMENDMENT  NO.  11 TO  AMENDED  AND  RESTATED  AGREEMENT  OF  LIMITED
PARTNERSHIP OF PRIME GROUP REALTY,  L.P. (this  "Amendment")  is made as of July
15, 1998 by Prime Group Realty Trust,  a Maryland real estate  investment  trust
("PGRT"),  as the  Managing  General  Partner of Prime  Group  Realty,  L.P.,  a
Delaware  limited  partnership (the  "Partnership"),  and on behalf of the other
Partners (as  hereinafter  defined).  Capitalized  terms used but not  otherwise
defined  herein shall have the  meanings  given to such terms in the Amended and
Restated  Agreement  of  Limited  Partnership  of the  Partnership,  dated as of
November 17, 1997, by and among PGRT and the other parties signatory thereto, as
amended thereafter (as so amended, the "Limited Partnership Agreement").

                              W I T N E S S E T H:

     WHEREAS,  pursuant to Section 4.3.C. of the Limited Partnership  Agreement,
the Managing  General  Partner may raise all or any portion of Additional  Funds
required by the  Partnership  for the  acquisition  of additional  properties by
accepting  additional  Capital  Contributions,  including the issuance of Common
Units for  Capital  Contributions  that  consist of  property  or  interests  in
property;

     WHEREAS,  pursuant to that certain Exchange  Agreement dated as of December
15,  1997 by and  between H Group  LLC,  a Delaware  limited  liability  company
("HG"), and the Partnership (the "Exchange  Agreement"),  HG agreed, among other
things,  to grant to the  Partnership an option (the "First Option") to exchange
the Underlying Option (as defined in the Exchange  Agreement) for 220,000 Common
Units of Limited Partner Interest  (subject to adjustment  pursuant to the terms
of the Exchange  Agreement),  which grant of the First Option  contemplated  the
transfer  by the  Partnership  to HG of 5,000  Common  Units of Limited  Partner
Interest  on the date  thereof  and,  subject to the terms of the First  Option,
5,000 Common Units of Limited Partner Interest  (subject to adjustment  pursuant
to the terms of the Exchange Agreement) on the 15th day of each month thereafter
(each such transfer a "First Option  Maintenance  Transfer")  for such number of
months set forth in the Exchange Agreement;

     WHEREAS,  the Partnership has agreed to the terms of the grant by HG of the
First Option set forth in the Exchange Agreement and desires to effect the First
Option Maintenance Transfer due on July 15, 1998;

     WHEREAS,  HG was  admitted  to the  Partnership  as an  Additional  Limited
Partner as of December  15,  1997  pursuant  to  Amendment  No. 2 to the Limited
Partnership Agreement;

     WHEREAS, the Partners desire to amend the Limited Partnership  Agreement to
reflect the increase in outstanding  Common Units resulting from the issuance of
Common Units to HG in connection with the First Option Maintenance  Transfer due
on July 15, 1998; and

     WHEREAS,  Sections  2.4  and  12.3  of the  Limited  Partnership  Agreement
authorize,  among other things, the Managing General Partner, as true and lawful
agent and attorney-in fact, to execute, swear to, acknowledge, deliver, file and
record this  Amendment  on behalf of each  Partner that has executed the Limited
Partnership Agreement and on behalf of the Partnership.

                                       -1-
<PAGE>
     NOW,  THEREFORE,  for good and  adequate  consideration,  the  receipt  and
sufficiency  of which are  hereby  acknowledged,  the  parties  hereto  agree as
follows:

     SECTION 1. ACCEPTANCE OF CAPITAL CONTRIBUTION IN EXCHANGE FOR COMMON UNITS.
(a) PGRT, as Managing General Partner and on behalf of the  Partnership,  hereby
accepts the grant of the rights consisting of the First Option during the eighth
month of the term of the First Option from HG as a Capital Contribution having a
value on the date hereof of  $100,000,  in exchange  for 5,465  Common  Units of
Limited  Partner  Interest  which are  hereby  issued by the  Partnership  to HG
pursuant to Section 4.3.C. of the Limited Partnership  Agreement,  and which are
evidenced by Common Unit Certificate No. 31 of the Partnership.

          (b) Each of the Common Units of Limited Partner  Interest issued to HG
pursuant  to this  SECTION 1 shall  have the same  terms and  provisions  of the
Common Units of Limited  Partner  Interest issued by the Partnership on November
17, 1997 except that (i) the Exchange Rights  relating  thereto may be exercised
at any time after  December  15, 1998 (as opposed to November 17, 1998) and (ii)
such  Common  Units  of  Limited  Partner   Interest  will  be  subject  to  the
Registration  Rights  Agreement dated as of December 15, 1997 by and among PGRT,
the Partnership and HG as opposed to the Registration  Rights Agreement  entered
into by PGRT and the Partnership on November 17, 1997.

     SECTION 2.  AMENDMENT  OF EXHIBIT A TO THE LIMITED  PARTNERSHIP  AGREEMENT.
Exhibit A to the Limited Partnership Agreement is hereby amended and restated to
reflect the  aforementioned  change(s) by deleting Exhibit A attached thereto in
its entirety, and by attaching in lieu thereof a replacement exhibit in the form
of  EXHIBIT  A  attached  hereto.  From  and  after  the  effectiveness  of this
Amendment,  the amended and restated EXHIBIT A attached hereto shall be the only
Exhibit A to the Limited Partnership Agreement, unless and until it is hereafter
further amended.

     SECTION 3. REFERENCE TO AND EFFECT ON THE LIMITED PARTNERSHIP AGREEMENT.

          A. The Limited Partnership Agreement is hereby deemed to be amended to
the extent  necessary  to effect the  matters  contemplated  by this  Amendment.
Except as specifically  provided for hereinabove,  the provisions of the Limited
Partnership Agreement shall remain in full force and effect.

          B. The execution,  delivery and  effectiveness of this Amendment shall
not  operate  (i) as a  waiver  of any  provision,  right or  obligation  of the
Managing General Partner, the other General Partner or any Limited Partner under
the Limited  Partnership  Agreement  except as specifically  set forth herein or
(ii) as a waiver or consent to any subsequent action or transaction.

          SECTION 4.  APPLICABLE  LAW.  This  Amendment  shall be  construed  in
accordance  with and  governed  by the laws of the  State of  Delaware,  without
regard to the principles of conflicts of law.

                                       -2-

                            [signature page follows]
<PAGE>
                                  AMENDMENT NO. 11 TO AMENDED AND RESTATED
                                  AGREEMENT OF LIMITED PARTNERSHIP OF PRIME
                                  GROUP REALTY, L.P.

     IN WITNESS  WHEREOF,  the parties hereto have executed this Amendment as of
the date first written above.

                                       MANAGING GENERAL PARTNER:
                                       -------------------------
                                       PRIME GROUP REALTY TRUST, a
                                       Maryland real estate investment trust

                                       By:   /s/ Jeffrey A. Patterson
                                          --------------------------------------
                                          Name:  Jeffrey A. Patterson

                                          Title: Executive Vice President

                                       LIMITED PARTNERS:
                                       -----------------

                                       Each Limited Partner hereby executes
                                       this Amendment to the Limited
                                       Partnership Agreement.

                                       By: PRIME GROUP REALTY TRUST, a
                                           Maryland real estate investment
                                           trust, as attorney-in fact

                                           By:    /s/ Jeffrey A. Patterson
                                               ---------------------------------
                                               Name:  Jeffrey A. Patterson

                                               Title: Executive Vice President

                                      -3-
<PAGE>
                                   EXHIBIT A*/
                                            -
               PARTNERS, NUMBER OF UNITS AND CAPITAL CONTRIBUTIONS

                                         Number of                    Capital
Managing General Partner                Common Units                Contribution
- ------------------------                ------------                ------------

Prime Group Realty Trust                 15,572,494                     **/
    77 West Wacker Drive                                                --
    Suite 3900
    Chicago, IL  60601
    Attn: Richard S. Curto
          James F. Hoffman

General Partner
- ---------------

The Nardi Group, L.L.C                      927,100                  $18,542,000
    c/o Stephen J. Nardi
    4100 Madison Street
    Hillside, IL  60162

Limited Partners
- ----------------

Edward S. Hadesman                          388,677                   $7,773,540
Trust Dated May 22, 1992
    c/o Edward S. Hadesman
    2500 North Lakeview, Unit 1401
    Chicago, IL  60614

Grandville/Northwestern                       9,750                     $195,000
Management Corporation
    c/o Edward S. Hadesman
    2500 North Lakeview, Unit 1401
    Chicago, IL  60614

Carolyn B. Hadesman                          54,544                   $1,090,880
Trust Dated May 21, 1992
    c/o Edward S. Hadesman
    2500 North Lakeview, Unit 1401
    Chicago, IL  60614

- --------

*/   As amended by  Amendment  No. 11 to the Amended and  Restated  Agreement of
- -    Limited Partnership of Prime Group Realty, L.P.

**/  This amount shall be inserted by the Managing General Partner.
- --
<PAGE>
                               EXHIBIT A - CONT'D

               PARTNERS, NUMBER OF UNITS AND CAPITAL CONTRIBUTIONS

                                         Number of                    Capital
Limited Partners (Cont'd)               Common Units                Contribution
- -------------------------               ------------                ------------

Lisa Hadesman 1991 Trust                    169,053                   $3,381,060
    c/o Edward S. Hadesman
    2500 North Lakeview, Unit 1401
    Chicago, IL  60614

Cynthia Hadesman 1991 Trust                 169,053                   $3,381,060
    c/o Edward S. Hadesman
    2500 North Lakeview, Unit 1401
    Chicago, IL  60614

Tucker B. Magid                              33,085                     $661,700
    545 Ridge Road
    Highland Park, IL  60035

Frances S. Shubert                           28,805                     $576,100
    511 Lynn Terrace
    Waukegan, IL  60085

Grandville Road Property, Inc.                7,201                     $144,020
    c/o Ms. Frances S. Shubert
    511 Lynn Terrace
    Waukegan, IL  60085

Sky Harbor Associates                        62,149                   $1,242,980
    c/o Howard I. Bernstein
    6541 North Kilbourn
    Lincolnwood, IL  60646

Jeffrey A. Patterson                        110,000                   $2,200,000
    c/o Prime Group Realty Trust
    77 West Wacker Drive
    Suite 3900
    Chicago, IL  60601

Primestone Investment Partners, L.P.      7,944,893                          **/
    c/o The Prime Group, Inc.                                                --
    77 West Wacker Drive
    Suite 3900
    Chicago, IL  60601
    Attn:  Paul A. Roehri

- --------

**/  This amount shall be inserted by the Managing General Partner.
- --
<PAGE>
                               EXHIBIT A - CONT'D

               PARTNERS, NUMBER OF UNITS AND CAPITAL CONTRIBUTIONS


                                         Number of                    Capital
Limited Partners (Cont'd)               Common Units                Contribution
- -------------------------               ------------                ------------

Prime Group Limited Partnership              47,525                     $950,500
    c/o The Prime Group, Inc.
    77 West Wacker Drive
    Suite 3900
    Chicago, IL  60601
    Attn:  Michael W. Reshcke
           Robert J. Rudnik

H Group LLC                                 292,037                   $5,700,000
    c/o Heitman Financial Ltd.
    180 N. LaSalle
    Suite 3600
    Chicago, IL  60601
    Attn:  Norman Perlmutter

Ray R. Grinvalds                              5,216                     $104,320
    217 Deer Valley Drive
    Barrington, IL  60010

Warren H. John                               37,259                     $745,180
    1730 N. Clark Street
    Chicago, IL  60614

<PAGE>
                               EXHIBIT A - CONT'D

               PARTNERS, NUMBER OF UNITS AND CAPITAL CONTRIBUTIONS

                                        Number of                     Capital
Managing General Partner             Preferred Units                Contribution
- ------------------------             ---------------                ------------

Prime Group Realty Trust             2,000,000                          **/
    77 West Wacker Drive             Convertible Preferred              --
    Suite 3900                       Units
    Chicago, IL  60601
    Attn:  Richard S. Curto
           James F. Hoffman

Prime Group Realty Trust             4,000,000                           **/
    77 West Wacker Drive             Series B Preferred Units            --
    Suite 3900
    Chicago, IL  60601
    Attn:  Richard S. Curto
           James F. Hoffman

- --------

**/  This amount shall be inserted by the Managing General Partner.
- --


                    AMENDMENT NO. 12 TO AMENDED AND RESTATED
                        AGREEMENT OF LIMITED PARTNERSHIP
                           OF PRIME GROUP REALTY, L.P.

     This  AMENDMENT  NO.  12 TO  AMENDED  AND  RESTATED  AGREEMENT  OF  LIMITED
PARTNERSHIP OF PRIME GROUP REALTY,  L.P. (this "Amendment") is made as of August
14, 1998 by Prime Group Realty Trust,  a Maryland real estate  investment  trust
("PGRT"),  as the  Managing  General  Partner of Prime  Group  Realty,  L.P.,  a
Delaware  limited  partnership (the  "Partnership"),  and on behalf of the other
Partners (as  hereinafter  defined).  Capitalized  terms used but not  otherwise
defined  herein shall have the  meanings  given to such terms in the Amended and
Restated  Agreement  of  Limited  Partnership  of the  Partnership,  dated as of
November 17, 1997, by and among PGRT and the other parties signatory thereto, as
amended thereafter (as so amended, the "Limited Partnership Agreement").

                              W I T N E S S E T H:

     WHEREAS,  pursuant to Section 4.3.C. of the Limited Partnership  Agreement,
the Managing  General  Partner may raise all or any portion of Additional  Funds
required by the  Partnership  for the  acquisition  of additional  properties by
accepting  additional  Capital  Contributions,  including the issuance of Common
Units for  Capital  Contributions  that  consist of  property  or  interests  in
property;

     WHEREAS,  pursuant to that certain Exchange  Agreement dated as of December
15,  1997 by and  between H Group  LLC,  a Delaware  limited  liability  company
("HG"), and the Partnership (the "Exchange  Agreement"),  HG agreed, among other
things,  to grant to the  Partnership an option (the "First Option") to exchange
the Underlying Option (as defined in the Exchange  Agreement) for 220,000 Common
Units of Limited Partner Interest  (subject to adjustment  pursuant to the terms
of the Exchange  Agreement),  which grant of the First Option  contemplated  the
transfer  by the  Partnership  to HG of 5,000  Common  Units of Limited  Partner
Interest  on the date  thereof  and,  subject to the terms of the First  Option,
5,000 Common Units of Limited Partner Interest  (subject to adjustment  pursuant
to the terms of the Exchange Agreement) on the 15th day of each month thereafter
(each such transfer a "First Option  Maintenance  Transfer")  for such number of
months set forth in the Exchange Agreement;

     WHEREAS,  the Partnership has agreed to the terms of the grant by HG of the
First Option set forth in the Exchange Agreement and desires to effect the First
Option Maintenance Transfer due on August 14, 1998;

     WHEREAS,  HG was  admitted  to the  Partnership  as an  Additional  Limited
Partner as of December  15,  1997  pursuant  to  Amendment  No. 2 to the Limited
Partnership Agreement;

     WHEREAS, the Partners desire to amend the Limited Partnership  Agreement to
reflect the increase in outstanding  Common Units resulting from the issuance of
Common Units to HG in connection with the First Option Maintenance  Transfer due
on August 14, 1998; and

     WHEREAS,  Sections  2.4  and  12.3  of the  Limited  Partnership  Agreement
authorize,  among other things, the Managing General Partner, as true and lawful
agent and attorney-in fact, to execute, swear to, acknowledge, deliver, file and
record this  Amendment  on behalf of each  Partner that has executed the Limited
Partnership Agreement and on behalf of the Partnership.

                                       -1-
<PAGE>
     NOW,  THEREFORE,  for good and  adequate  consideration,  the  receipt  and
sufficiency  of which are  hereby  acknowledged,  the  parties  hereto  agree as
follows:

     SECTION 1. ACCEPTANCE OF CAPITAL CONTRIBUTION IN EXCHANGE FOR COMMON UNITS.
(a) PGRT, as Managing General Partner and on behalf of the  Partnership,  hereby
accepts the grant of the rights  consisting of the First Option during the ninth
month of the term of the First Option from HG as a Capital Contribution having a
value on the date hereof of  $100,000,  in exchange  for 5,429  Common  Units of
Limited  Partner  Interest  which are  hereby  issued by the  Partnership  to HG
pursuant to Section 4.3.C. of the Limited Partnership  Agreement,  and which are
evidenced by Common Unit Certificate No. 32 of the Partnership.

          (b) Each of the Common Units of Limited Partner  Interest issued to HG
pursuant  to this  SECTION 1 shall  have the same  terms and  provisions  of the
Common Units of Limited  Partner  Interest issued by the Partnership on November
17, 1997 except that (i) the Exchange Rights  relating  thereto may be exercised
at any time after  December  15, 1998 (as opposed to November 17, 1998) and (ii)
such  Common  Units  of  Limited  Partner   Interest  will  be  subject  to  the
Registration  Rights  Agreement dated as of December 15, 1997 by and among PGRT,
the Partnership and HG as opposed to the Registration  Rights Agreement  entered
into by PGRT and the Partnership on November 17, 1997.

     SECTION 2.  AMENDMENT  OF EXHIBIT A TO THE LIMITED  PARTNERSHIP  AGREEMENT.
Exhibit A to the Limited Partnership Agreement is hereby amended and restated to
reflect the  aforementioned  change(s) by deleting Exhibit A attached thereto in
its entirety, and by attaching in lieu thereof a replacement exhibit in the form
of  EXHIBIT  A  attached  hereto.  From  and  after  the  effectiveness  of this
Amendment,  the amended and restated Exhibit A attached hereto shall be the only
EXHIBIT A to the Limited Partnership Agreement, unless and until it is hereafter
further amended.

     SECTION 3. REFERENCE TO AND EFFECT ON THE LIMITED PARTNERSHIP AGREEMENT.

          A. The Limited Partnership Agreement is hereby deemed to be amended to
the extent  necessary  to effect the  matters  contemplated  by this  Amendment.
Except as specifically  provided for hereinabove,  the provisions of the Limited
Partnership Agreement shall remain in full force and effect.

          B. The execution,  delivery and  effectiveness of this Amendment shall
not  operate  (i) as a  waiver  of any  provision,  right or  obligation  of the
Managing General Partner, the other General Partner or any Limited Partner under
the Limited  Partnership  Agreement  except as specifically  set forth herein or
(ii) as a waiver or consent to any subsequent action or transaction.

     SECTION 4.  APPLICABLE LAW. This Amendment shall be construed in accordance
with and  governed by the laws of the State of Delaware,  without  regard to the
principles of conflicts of law.

                            [signature page follows]

                                       -2-
<PAGE>
                                  AMENDMENT NO. 12 TO AMENDED AND RESTATED
                                  AGREEMENT OF LIMITED PARTNERSHIP OF PRIME
                                  GROUP REALTY, L.P.

     IN WITNESS  WHEREOF,  the parties hereto have executed this Amendment as of
the date first written above.

                                       MANAGING GENERAL PARTNER:
                                       -------------------------

                                       PRIME GROUP REALTY TRUST, a
                                       Maryland real estate investment trust

                                       By:    /s/ W. Michael Karnes
                                           -------------------------------------
                                           Name:  W. Michael Karnes

                                           Title: Executive Vice President

                                       LIMITED PARTNERS:
                                       -----------------

                                       Each Limited Partner hereby executes
                                       this Amendment to the Limited
                                       Partnership Agreement.

                                       By:  PRIME GROUP REALTY TRUST, a
                                            Maryland real estate investment
                                            trust, as attorney-in fact

                                            By:   /s/ W. Michael Karnes
                                               ---------------------------------

                                               Name:  W. Michael Karnes

                                               Title: Executive Vice President

                                       -3-
<PAGE>
                                   EXHIBIT A*/
                                            -
               PARTNERS, NUMBER OF UNITS AND CAPITAL CONTRIBUTIONS

                                              Number of               Capital
Managing General Partner                    Common Units            Contribution
- ------------------------                    ------------            ------------

Prime Group Realty Trust                     15,584,994                  **/
    77 West Wacker Drive                                                 --
    Suite 3900
    Chicago, IL  60601
    Attn:  Richard S. Curto
           James F. Hoffman

General Partner
- ---------------

The Nardi Group, L.L.C                          927,100              $18,542,000
    c/o Stephen J. Nardi
    4100 Madison Street
    Hillside, IL  60162

Limited Partners
- ----------------

Edward S. Hadesman                              388,677               $7,773,540
Trust Dated May 22, 1992
    c/o Edward S. Hadesman
    2500 North Lakeview, Unit 1401
    Chicago, IL  60614

Grandville/Northwestern                           9,750                 $195,000
Management Corporation
    c/o Edward S. Hadesman
    2500 North Lakeview, Unit 1401
    Chicago, IL  60614

Carolyn B. Hadesman                              54,544               $1,090,880
Trust Dated May 21, 1992
    c/o Edward S. Hadesman
    2500 North Lakeview, Unit 1401
    Chicago, IL  60614

- --------

*/   As amended by  Amendment  No. 12 to the Amended and  Restated  Agreement of
- -    Limited Partnership of Prime Group Realty, L.P.

**/  This amount shall be inserted by the Managing General Partner.
- --

<PAGE>
                               EXHIBIT A - CONT'D

               PARTNERS, NUMBER OF UNITS AND CAPITAL CONTRIBUTIONS

                                              Number of                Capital
Limited Partners (Cont'd)                   Common Units            Contribution
- -------------------------                   ------------            ------------

Lisa Hadesman 1991 Trust                        169,053               $3,381,060
    c/o Edward S. Hadesman
    2500 North Lakeview, Unit 1401
    Chicago, IL  60614

Cynthia Hadesman 1991 Trust                     169,053               $3,381,060
    c/o Edward S. Hadesman
    2500 North Lakeview, Unit 1401
    Chicago, IL  60614

Tucker B. Magid                                  33,085                 $661,700
    545 Ridge Road
    Highland Park, IL  60035

Frances S. Shubert                               28,805                 $576,100
    511 Lynn Terrace
    Waukegan, IL  60085

Grandville Road Property, Inc.                    7,201                 $144,020
    c/o Ms. Frances S. Shubert
    511 Lynn Terrace
    Waukegan, IL  60085

Sky Harbor Associates                            62,149               $1,242,980
    c/o Howard I. Bernstein
    6541 North Kilbourn
    Lincolnwood, IL  60646

Jeffrey A. Patterson                            110,000               $2,200,000
    c/o Prime Group Realty Trust
    77 West Wacker Drive
    Suite 3900
    Chicago, IL  60601

Primestone Investment Partners, L.P.          7,944,893                   **/
    c/o The Prime Group, Inc.                                             --
    77 West Wacker Drive
    Suite 3900
    Chicago, IL  60601
    Attn:  Paul A. Roehri

- --------

**/  This amount shall be inserted by the Managing General Partner.
- --

<PAGE>
                               EXHIBIT A - CONT'D

               PARTNERS, NUMBER OF UNITS AND CAPITAL CONTRIBUTIONS

                                              Number of                Capital
Limited Partners (Cont'd)                   Common Units            Contribution
- -------------------------                   ------------            ------------

Prime Group Limited Partnership                  47,525                 $950,500
    c/o The Prime Group, Inc.
    77 West Wacker Drive
    Suite 3900
    Chicago, IL  60601
    Attn:  Michael W. Reshcke
           Robert J. Rudnik

H Group LLC                                     297,466               $5,800,000
    c/o Heitman Financial Ltd.
    180 N. LaSalle
    Suite 3600
    Chicago, IL  60601
    Attn:  Norman Perlmutter

Ray R. Grinvalds                                  5,216                 $104,320
    217 Deer Valley Drive
    Barrington, IL  60010

Warren H. John                                   37,259                 $745,180
    1730 N. Clark Street
    Chicago, IL  60614

<PAGE>
                               EXHIBIT A - CONT'D

               PARTNERS, NUMBER OF UNITS AND CAPITAL CONTRIBUTIONS

                                          Number of                   Capital
Managing General Partner                Preferred Units             Contribution
- ------------------------                ---------------             ------------

Prime Group Realty Trust                2,000,000                       **/
    77 West Wacker Drive                Convertible Preferred           --
    Suite 3900                          Units
    Chicago, IL  60601
    Attn:  Richard S. Curto
           James F. Hoffman

Prime Group Realty Trust                4,000,000                       **/
    77 West Wacker Drive                Series B Preferred Units        --
    Suite 3900
    Chicago, IL  60601
    Attn:  Richard S. Curto
           James F. Hoffman

- --------

**/  This amount shall be inserted by the Managing General Partner.
- --

                    AMENDMENT NO. 13 TO AMENDED AND RESTATED
                        AGREEMENT OF LIMITED PARTNERSHIP
                           OF PRIME GROUP REALTY, L.P.

     This  AMENDMENT  NO.  13 TO  AMENDED  AND  RESTATED  AGREEMENT  OF  LIMITED
PARTNERSHIP  OF  PRIME  GROUP  REALTY,  L.P.  (this  "Amendment")  is made as of
September  15,  1998 by  Prime  Group  Realty  Trust,  a  Maryland  real  estate
investment  trust  ("PGRT"),  as the  Managing  General  Partner of Prime  Group
Realty, L.P., a Delaware limited partnership (the "Partnership"),  and on behalf
of the other Partners (as hereinafter  defined).  Capitalized terms used but not
otherwise  defined  herein  shall have the  meanings  given to such terms in the
Amended and Restated Agreement of Limited Partnership of the Partnership,  dated
as of  November  17,  1997,  by and among PGRT and the other  parties  signatory
thereto,  as  amended  thereafter  (as  so  amended,  the  "Limited  Partnership
Agreement").

                              W I T N E S S E T H:

     WHEREAS,  pursuant to Section 4.3.C. of the Limited Partnership  Agreement,
the Managing  General  Partner may raise all or any portion of Additional  Funds
required by the  Partnership  for the  acquisition  of additional  properties by
accepting  additional  Capital  Contributions,  including the issuance of Common
Units for  Capital  Contributions  that  consist of  property  or  interests  in
property;

     WHEREAS,  pursuant to that certain Exchange  Agreement dated as of December
15,  1997 by and  between H Group  LLC,  a Delaware  limited  liability  company
("HG"), and the Partnership (the "Exchange  Agreement"),  HG agreed, among other
things,  to grant to the  Partnership an option (the "First Option") to exchange
the Underlying Option (as defined in the Exchange  Agreement) for 220,000 Common
Units of Limited Partner Interest  (subject to adjustment  pursuant to the terms
of the Exchange  Agreement),  which grant of the First Option  contemplated  the
transfer  by the  Partnership  to HG of 5,000  Common  Units of Limited  Partner
Interest  on the date  thereof  and,  subject to the terms of the First  Option,
5,000 Common Units of Limited Partner Interest  (subject to adjustment  pursuant
to the terms of the Exchange Agreement) on the 15th day of each month thereafter
(each such transfer a "First Option  Maintenance  Transfer")  for such number of
months set forth in the Exchange Agreement;

     WHEREAS,  the Partnership has agreed to the terms of the grant by HG of the
First Option set forth in the Exchange Agreement and desires to effect the First
Option Maintenance Transfer due on September 15, 1998;

     WHEREAS,  HG was  admitted  to the  Partnership  as an  Additional  Limited
Partner as of December  15,  1997  pursuant  to  Amendment  No. 2 to the Limited
Partnership Agreement;

     WHEREAS, the Partners desire to amend the Limited Partnership  Agreement to
reflect the increase in outstanding  Common Units resulting from the issuance of
Common Units to HG in connection with the First Option Maintenance  Transfer due
on September 15, 1998; and

     WHEREAS,  Sections  2.4  and  12.3  of the  Limited  Partnership  Agreement
authorize,  among other things, the Managing General Partner, as true and lawful
agent and attorney-in fact, to execute, swear to, acknowledge, deliver, file and
record this  Amendment  on behalf of each  Partner that has executed the Limited
Partnership Agreement and on behalf of the Partnership.

                                       -1-
<PAGE>
     NOW,  THEREFORE,  for good and  adequate  consideration,  the  receipt  and
sufficiency  of which are  hereby  acknowledged,  the  parties  hereto  agree as
follows:

     SECTION 1. ACCEPTANCE OF CAPITAL CONTRIBUTION IN EXCHANGE FOR COMMON UNITS.
(a) PGRT, as Managing General Partner and on behalf of the  Partnership,  hereby
accepts the grant of the rights  consisting of the First Option during the tenth
month of the term of the First Option from HG as a Capital Contribution having a
value on the date hereof of  $100,000,  in exchange  for 6,399  Common  Units of
Limited  Partner  Interest  which are  hereby  issued by the  Partnership  to HG
pursuant to Section 4.3.C. of the Limited Partnership  Agreement,  and which are
evidenced by Common Unit Certificate No. 32 of the Partnership.

          (b) Each of the Common Units of Limited Partner  Interest issued to HG
pursuant  to this  SECTION 1 shall  have the same  terms and  provisions  of the
Common Units of Limited  Partner  Interest issued by the Partnership on November
17, 1997 except that (i) the Exchange Rights  relating  thereto may be exercised
at any time after  December  15, 1998 (as opposed to November 17, 1998) and (ii)
such  Common  Units  of  Limited  Partner   Interest  will  be  subject  to  the
Registration  Rights  Agreement dated as of December 15, 1997 by and among PGRT,
the Partnership and HG as opposed to the Registration  Rights Agreement  entered
into by PGRT and the Partnership on November 17, 1997.

     SECTION 2.  AMENDMENT  OF EXHIBIT A TO THE LIMITED  PARTNERSHIP  AGREEMENT.
Exhibit A to the Limited Partnership Agreement is hereby amended and restated to
reflect the  aforementioned  change(s) by deleting Exhibit A attached thereto in
its entirety, and by attaching in lieu thereof a replacement exhibit in the form
of  Exhibit  A  attached  hereto.  From  and  after  the  effectiveness  of this
Amendment,  the amended and restated Exhibit A attached hereto shall be the only
Exhibit A to the Limited Partnership Agreement, unless and until it is hereafter
further amended.

     SECTION 3. REFERENCE TO AND EFFECT ON THE LIMITED PARTNERSHIP AGREEMENT.

          A. The Limited Partnership Agreement is hereby deemed to be amended to
the extent  necessary  to effect the  matters  contemplated  by this  Amendment.
Except as specifically  provided for hereinabove,  the provisions of the Limited
Partnership Agreement shall remain in full force and effect.

          B. The execution,  delivery and  effectiveness of this Amendment shall
not  operate  (i) as a  waiver  of any  provision,  right or  obligation  of the
Managing General Partner, the other General Partner or any Limited Partner under
the Limited  Partnership  Agreement  except as specifically  set forth herein or
(ii) as a waiver or consent to any subsequent action or transaction.

     SECTION 4.  APPLICABLE LAW. This Amendment shall be construed in accordance
with and  governed by the laws of the State of Delaware,  without  regard to the
principles of conflicts of law.

                            [signature page follows]

                                       -2-
<PAGE>
                                  AMENDMENT NO. 13 TO AMENDED AND RESTATED
                                  AGREEMENT OF LIMITED PARTNERSHIP OF PRIME
                                  GROUP REALTY, L.P.

     IN WITNESS  WHEREOF,  the parties hereto have executed this Amendment as of
the date first written above.

                                       MANAGING GENERAL PARTNER:
                                       -------------------------
                                       PRIME GROUP REALTY TRUST, a
                                       Maryland real estate investment trust

                                       By:    /s/ Jeffrey A. Patterson
                                           -------------------------------------

                                           Name:  Jeffrey A. Patterson

                                           Title: Executive Vice President

                                       LIMITED PARTNERS:
                                       -----------------

                                       Each Limited Partner hereby executes
                                       this Amendment to the Limited
                                       Partnership Agreement.

                                       By:  PRIME GROUP REALTY TRUST, a
                                            Maryland real estate investment
                                            trust, as attorney-in fact

                                            By: /s/ Jeffrey A. Patterson
                                                --------------------------------

                                            Name:  Jeffrey A. Patterson

                                            Title: Executive Vice President

                                       -3-
<PAGE>
                                   EXHIBIT A*/
                                            -
               PARTNERS, NUMBER OF UNITS AND CAPITAL CONTRIBUTIONS

                                             Number of                Capital
Managing General Partner                    Common Units            Contribution
- ------------------------                    ------------            ------------

Prime Group Realty Trust                     15,584,994                  **/
    77 West Wacker Drive                                                 --
    Suite 3900
    Chicago, IL  60601
    Attn:  Richard S. Curto
           James F. Hoffman

General Partner
- ---------------

The Nardi Group, L.L.C                          927,100              $18,542,000
    c/o Stephen J. Nardi
    4100 Madison Street
    Hillside, IL  60162

Limited Partners
- ----------------

Edward S. Hadesman                              388,677               $7,773,540
Trust Dated May 22, 1992
    c/o Edward S. Hadesman
    2500 North Lakeview, Unit 1401
    Chicago, IL  60614

Grandville/Northwestern                           9,750                 $195,000
Management Corporation
    c/o Edward S. Hadesman
    2500 North Lakeview, Unit 1401
    Chicago, IL  60614

Carolyn B. Hadesman                              54,544               $1,090,880
Trust Dated May 21, 1992
    c/o Edward S. Hadesman
    2500 North Lakeview, Unit 1401
    Chicago, IL  60614

- --------

*/   As amended by  Amendment  No. 13 to the Amended and  Restated  Agreement of
- -    Limited Partnership of Prime Group Realty, L.P.

**/  This amount shall be inserted by the Managing General Partner.
- --
<PAGE>
                               EXHIBIT A - CONT'D

               PARTNERS, NUMBER OF UNITS AND CAPITAL CONTRIBUTIONS

                                             Number of                Capital
Limited Partners (Cont'd)                   Common Units            Contribution
- -------------------------                   ------------            ------------

Lisa Hadesman 1991 Trust                        169,053               $3,381,060
    c/o Edward S. Hadesman
    2500 North Lakeview, Unit 1401
    Chicago, IL  60614

Cynthia Hadesman 1991 Trust                     169,053               $3,381,060
    c/o Edward S. Hadesman
    2500 North Lakeview, Unit 1401
    Chicago, IL  60614

Tucker B. Magid                                  33,085                 $661,700
    545 Ridge Road
    Highland Park, IL  60035

Frances S. Shubert                               28,805                 $576,100
    511 Lynn Terrace
    Waukegan, IL  60085

Grandville Road Property, Inc.                    7,201                 $144,020
    c/o Ms. Frances S. Shubert
    511 Lynn Terrace
    Waukegan, IL  60085

Sky Harbor Associates                            62,149               $1,242,980
    c/o Howard I. Bernstein
    6541 North Kilbourn
    Lincolnwood, IL  60646

Jeffrey A. Patterson                            110,000               $2,200,000
    c/o Prime Group Realty Trust
    77 West Wacker Drive
    Suite 3900
    Chicago, IL  60601

Primestone Investment Partners, L.P.          7,944,893                  **/
    c/o The Prime Group, Inc.                                            --
    77 West Wacker Drive
    Suite 3900
    Chicago, IL  60601
    Attn:  Paul A. Roehri

- --------

**/  This amount shall be inserted by the Managing General Partner.
- --
<PAGE>
                               EXHIBIT A - CONT'D

               PARTNERS, NUMBER OF UNITS AND CAPITAL CONTRIBUTIONS

                                             Number of                Capital
Limited Partners (Cont'd)                   Common Units            Contribution
- -------------------------                   ------------            ------------

Prime Group Limited Partnership                  47,525                 $950,500
    c/o The Prime Group, Inc.
    77 West Wacker Drive
    Suite 3900
    Chicago, IL  60601
    Attn:  Michael W. Reshcke
           Robert J. Rudnik

H Group LLC                                     303,865               $5,900,000
    c/o Heitman Financial Ltd.
    180 N. LaSalle
    Suite 3600
    Chicago, IL  60601
    Attn:  Norman Perlmutter

Ray R. Grinvalds                                  5,216                 $104,320
    217 Deer Valley Drive
    Barrington, IL  60010

Warren H. John                                   37,259                 $745,180
    1730 N. Clark Street
    Chicago, IL  60614
<PAGE>
                               EXHIBIT A - CONT'D

               PARTNERS, NUMBER OF UNITS AND CAPITAL CONTRIBUTIONS

                                           Number of                  Capital
Managing General Partner                 Preferred Units            Contribution
- ------------------------                 ---------------            ------------

Prime Group Realty Trust                 2,000,000                       **/
    77 West Wacker Drive                 Convertible Preferred           --
    Suite 3900                           Units
    Chicago, IL  60601
    Attn:  Richard S. Curto
           James F. Hoffman

Prime Group Realty Trust                 4,000,000                      **/
    77 West Wacker Drive                 Series B Preferred Units       --
    Suite 3900
    Chicago, IL  60601
    Attn:  Richard S. Curto
           James F. Hoffman

- --------

**/  This amount shall be inserted by the Managing General Partner.
- --

                     PRIME GROUP REALTY TRUST (THE COMPANY)
                                       AND
             PREDECESSOR PROPERTIES (THE PREDECESSOR OF THE COMPANY)

EXHIBIT  12.1:  COMPUTATION  OF RATIO OF  EARNINGS  COMBINED  FIXED  CHARGES AND
                PREFERRED STOCK DISTRIBUTIONS AND DIVIDENDS

              (Amounts in thousands, except for ratio information)
<TABLE>
<CAPTION>
                                                 NINE MONTHS ENDED SEPTEMBER 30
                                                 ------------------------------
                                                     1998              1997
                                                  PRIME GROUP       PREDECESSOR
                                                  REALTY TRUST      PROPERTIES
                                                 -------------    -------------
<S>                                              <C>              <C>
Income before minority interests
  and extraordinary item....................    $       22,095   $      (22,100)
Interest incurred...........................            22,091           29,099
Amortization of debt issuance costs.........             1,062              447
Less capitalized interest...................            (1,403)              --
                                                 -------------    -------------

         Earnings...........................            43,845            4,446
                                                 -------------    -------------

Interest incurred...........................            22,091           29,099
Amortization of debt issuance costs.........             1,062              447
Preferred stock distributions...............             4,991               --
                                                 -------------    -------------
    Combined Fixed Charges and
      Preferred Stock Distributions and
        Dividends...........................            28,144           28,546
                                                 -------------    -------------

Excess of Combined Fixed Charges
    and Preferred Stock Distributions

    and Dividends over Earnings.............                     $      (25,100)
                                                                  =============

Ratio of Earnings to Combined Fixed
    Charges and Preferred Stock

    Distributions and Dividends.............    $         1.56 x
                                                 =============
</TABLE>

<TABLE> <S> <C>

<ARTICLE>                     5
<MULTIPLIER>               1000
       
<S>                                            <C>
<PERIOD-TYPE>                                  Year
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-START>                                 JAN-01-1998
<PERIOD-END>                                   SEP-30-1998
<CASH>                                               8,138
<SECURITIES>                                             0
<RECEIVABLES>                                      110,133
<ALLOWANCES>                                             0
<INVENTORY>                                        111,290  <F1>
<CURRENT-ASSETS>                                         0
<PP&E>                                             874,947
<DEPRECIATION>                                     (18,240)
<TOTAL-ASSETS>                                   1,086,268
<CURRENT-LIABILITIES>                              223,883  <F2>
<BONDS>                                            510,106
                                    0
                                             60
<COMMON>                                               153
<OTHER-SE>                                         352,066
<TOTAL-LIABILITY-AND-EQUITY>                     1,086,268
<SALES>                                                  0
<TOTAL-REVENUES>                                   106,926
<CGS>                                                    0
<TOTAL-COSTS>                                            0
<OTHER-EXPENSES>                                    71,809  <F3>
<LOSS-PROVISION>                                         0
<INTEREST-EXPENSE>                                  22,091
<INCOME-PRETAX>                                     13,026
<INCOME-TAX>                                             0
<INCOME-CONTINUING>                                      0
<DISCONTINUED>                                           0
<EXTRAORDINARY>                                        525
<CHANGES>                                                0
<NET-INCOME>                                        12,501
<EPS-PRIMARY>                                         0.51
<EPS-DILUTED>                                         0.51
        

<FN>
<F1> Amount includes restricted cash escrows ($49,750), net deferred costs
($31,623) and other assets ($29,917).
<F2> Amount includes  accrued  interest  payable  ($1,973),  accrued real estate
taxes ($31,836), accounts payable and accrued expenses (20,220), liabilities for
leases assumed ($4,790), dividends declared ($8,122), other liabilities ($7,083)
and minority interest of ($149,859).
<F3>Amount includes property operations ($20,758),  real estate taxes ($19,101),
depreciation and amortization  ($18,186),  general and  administrative  expenses
($4,695) and minority interest allocation of ($9,069).
</FN>

</TABLE>


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