PRIME GROUP REALTY TRUST
10-K/A, 1998-04-28
REAL ESTATE INVESTMENT TRUSTS
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                                 UNITED STATES
 
                       SECURITIES AND EXCHANGE COMMISSION
 
                             WASHINGTON, D.C. 20549
                            ------------------------
 
   
                                  FORM 10-K/A
    
 
   
                                AMENDMENT NO. 1
    
 
               /X/  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)
 
                     OF THE SECURITIES EXCHANGE ACT OF 1934
 
   
                  FOR THE FISCAL YEAR ENDED DECEMBER 31, 1997
                                       OR
    
 
   
             / /  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
    
 
                     OF THE SECURITIES EXCHANGE ACT OF 1934
 
   
             FOR THE TRANSITION PERIOD FROM _________ TO _________
    
 
                        COMMISSION FILE NUMBER:  1-13589
 
                            PRIME GROUP REALTY TRUST
 
             (Exact name of registrant as specified in its charter)
 
   
<TABLE>
<S>                                                        <C>
                        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)
</TABLE>
    
 
   
                                 (312) 917-1300
    
 
   
               Registrant's telephone number, including area code
    
 
          Securities registered pursuant to Section 12(b) of the Act:
 
<TABLE>
<S>                                             <C>
             TITLE OF EACH CLASS                  NAME OF EACH EXCHANGE ON WHICH REGISTERED
- ----------------------------------------------  ----------------------------------------------
    Common Shares of Beneficial Interest,                  New York Stock Exchange
           $.01 par value per share
</TABLE>
 
       Securities registered pursuant to Section 12(g) of the Act:  None
 
    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 by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained to the
best of the Registrant's knowledge, in definitive proxy or information
statements incorporated by reference in Part III of this Form 10-K or any
amendment to this Form 10-K.  / /
    
 
   
    The aggregate market value of the shares of common stock held by
non-affiliates was approximately $266,090,000 based on the closing price on the
New York Stock Exchange for such shares on March 2, 1998.
    
 
    The number of the Registrant's shares of common stock outstanding was
12,980,000 as of March 2, 1998.
 
                      DOCUMENTS INCORPORATED BY REFERENCE
 
    Part III of this report incorporates information by reference from the
definitive Proxy Statement for the Annual Meeting of Stockholders, to be held in
May 1998.
 
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    EXPLANATORY NOTE: Part III of this Form 10-K has been intentionally omitted
because this Amendment No. 1 does not effect any changes to such item. Changes
to Part I and II have been made to reflect adjustments to previously reported
disclosures. Such changes have no effect on the results of operations or the
financial position of the Company. Additionally, the exhibits set forth in Item
14 of Part IV have been amended.
    
<PAGE>
                                     PART I
 
ITEM 1. BUSINESS
 
BACKGROUND AND FORMATION TRANSACTION
 
    Prime Group Realty Trust (the "Company"), a Maryland real estate investment
trust, through its controlling interest in Prime Group Realty, L.P., a Delaware
limited partnership (the "Operating Partnership"), is engaged in the management,
leasing, acquisition, development, redevelopment, construction, marketing,
financing and other activities relating to commercial office and industrial
properties primarily located in the Chicago, Illinois metropolitan area (the
"Chicago Metropolitan Area"). As of December 31, 1997 the Company's portfolio of
properties included 19 office properties (the "Office Properties"), 45
industrial properties (the "Industrial Properties"), one parking facility and
one retail center (collectively the "Properties") containing an aggregate of 9.9
million net rentable square feet.
 
    The Company was incorporated in Maryland in July 1997 and formed to succeed
and expand the office and industrial real estate business of The Prime Group,
Inc., an Illinois corporation ("PGI"). On November 17, 1997, the Company
completed an initial public offering (the "Offering") of 12,380,000 common
shares of beneficial interest (the "Common Shares") and a private placement (the
"Private Placement") of 2,000,000 preferred shares of beneficial interest (the
"Preferred Shares"). The offering price of the Common Shares and the Preferred
Shares was $20.00 per share resulting in gross proceeds of $247.6 million and
$40.0 million, respectively. In addition, a joint venture partnership owned by
PGI, Blackstone, BRE/Primestone Investment L.L.C. and BRE/Primestone Management
Investment L.L.C. purchased 4,569,893 common units of the Operating Partnership
("Common Units") resulting in gross proceeds of $85.0 million. On December 15,
1997, the underwriters of the Offering exercised an over allotment option and,
accordingly, the Company issued an additional 600,000 Common Shares and received
gross proceeds of $12.0 million. The aggregate proceeds to the Company of the
Offering, the Private Placement and the exercise of the over-allotment option,
net of underwriter's discount, advisory fee and offering costs aggregating $27.6
million, were approximately $272.0 million. The Company contributed the net
proceeds of the Offering, the Private Placement and the exercise of the
over-allotment option to the Operating Partnership.
 
    Concurrently with the consummation of the Offering, the Company and the
Operating Partnership, together with the Operating Partnership's limited
partners, including certain partners of PGI, engaged in certain transactions
(the "Formation Transactions") which, among other things, resulted in the
contribution to and the acquisition by the Company and Operating Partnership of
63 of the 66 Properties.
 
    The Formation Transactions included the following:
 
    - PGI contributed to the Operating Partnership (i) its ownership interests
      in the property partnerships ("PGI Partnerships") that own certain of the
      Properties (the "Predecessor Properties"), (ii) its rights to purchase the
      subordinate mortgage encumbering the PGI Partnership that owns the 77 West
      Wacker Drive Building from certain third-party lenders and its rights to
      acquire certain third parties' ownership interests in the PGI Partnerships
      that own certain Predecessor Properties and (iii) substantially all of its
      assets and liabilities relating to its office and industrial development,
      leasing and management business. In exchange, PGI received 3,465,000
      Common Units (with an aggregate value of $69.3 million, assuming the value
      of each Common Unit is equal to the initial offering price of a Common
      Share). As described below, PGI contributed 3,375,000 of such Common Units
      to a joint venture between PGI and certain affiliates of Blackstone Real
      Estate Advisors, L.P. and certain of its affiliates ("Blackstone"),
      BRE/Primestone Investment L.L.C., a Delaware limited liability company and
      BRE/Primestone Management Investment L.L.C., a Delaware limited liability
      company (the "Primestone Joint Venture"), resulting in the direct
      ownership by PGI of a 0.5% limited partnership interest in the Operating
      Partnership as of December 31,
 
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      1997. In addition, Jeffrey A. Patterson, an executive of the Company,
      contributed his interest in the assets of the office and industrial
      division of PGI. In exchange, Mr. Patterson received 110,000 Common Units,
      representing approximately a 0.5% limited partnership interest in the
      Operating Partnership as of December 31, 1997.
 
    - Certain individuals (collectively, the "NAC Contributors") contributed six
      office and 14 industrial properties to the Operating Partnership. In
      exchange, the NAC Contributors received 927,100 common units of general
      partnership interest ("GP Common Units"), representing a 3.9% general
      partnership interest in the Operating Partnership as of December 31, 1997
      (with an aggregate value of $18.5 million, assuming the value of each
      Common Unit is equal to the initial public offering price of a Common
      Share). In addition, the Operating Partnership paid the NAC Contributors
      approximately $14.8 million in cash.
 
    - Certain individuals (collectively, the "IBD Contributors") contributed to
      the Operating Partnership their ownership interests in one office property
      and six industrial properties in exchange for 922,317 Common Units
      representing a 3.9% limited partnership interest in the Operating
      Partnership as of December 31, 1997 (with an aggregate value of $18.4
      million, assuming the value of each Common Unit is equal to the initial
      public offering price of a Common Share). In addition, the Operating
      Partnership paid the IBD Contributors approximately $0.9 million in cash,
      assumed approximately $6.4 million in debt and provided the IBD
      Contributors a note in the amount of $3.9 million (the properties
      contributed by the NAC Contributors and IBD Contributors are collectively
      the "Contribution Properties).
 
    - PGI, Blackstone, BRE/Primestone Investment L.L.C. and BRE/Primestone
      Management Investment L.L.C. formed the Primestone Joint Venture to invest
      in Common Units. To capitalize the Primestone Joint Venture, PGI
      contributed to the Primestone Joint Venture 3,375,000 of the Common Units
      it received in exchange for its contributions to the Operating
      Partnership. In addition, Primestone Joint Venture purchased 4,569,893
      Common Units from the Operating Partnership at a price per Common Unit
      equal to the per share initial public offering price of the Common Shares,
      net of an amount equal to the underwriting discounts and commissions
      applicable to the Common Shares, simultaneously with the other Formation
      Transactions. As a result, the Primestone Joint Venture owns 7,944,893
      Common Units, representing a 34.2% limited partnership interest in the
      Operating Partnership as of December 31, 1997.
 
    - The Operating Partnership borrowed $83.5 million under three separate
      mortgage loans secured by certain of the Contribution Properties (the "New
      Mortgage Notes") and assumed $10.4 million in mortgage notes.
 
    - The Operating Partnership repaid third-party lenders approximately $359.9
      million (including prepayment fees) of obligations of the entities that
      own the Properties (the "Property Partnerships") or indebtedness
      encumbering the Properties.
 
    - The Operating Partnership obtained a line of credit (the "Credit
      Facility") used to fund future acquisitions and to replace the outstanding
      letters of credit which secure the payment of principal and interest on
      $74.5 million of tax-exempt bond financing (the "Tax-Exempt Bonds").
 
    - The Operating Partnership paid approximately $40.0 million to acquire four
      office properties and one industrial property (collectively, the
      "Acquisition Properties") and approximately $5.2 million to acquire the
      assets and business of Continental Offices, Ltd. and Continental Offices,
      Ltd. Realty (collectively, the "Continental Management Business") from
      third parties. The purchase price for the Acquisition Properties and the
      Continental Management Business was in each case negotiated in
      arm's-length transactions with third parties based on a multiple of the
      net operating income of each of the Acquisition Properties and the
      Continental Management Business, respectively.
 
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    - The Operating Partnership paid approximately $1.8 million in cash to third
      parties for the balance of the ownership interests and subordinate debt
      interests relating to certain of the Predecessor Properties.
 
    - The Operating Partnership paid approximately $1.7 million in fees to
      obtain the Credit Facility and the New Mortgage Notes.
 
    - The Operating Partnership contributed the Continental Management Business,
      the health club facility located in the 77 West Wacker Drive Building and
      the office and industrial development, leasing and property management
      business to a newly formed company, Prime Group Realty Services, Inc. (the
      "Services Company") in exchange for (i) 100% of the non-voting
      participating preferred stock of the Services Company (the "Services
      Company Preferred Stock") and (ii) a promissory note issued by the
      Services Company with an initial principal balance of $4.8 million,
      bearing interest at 11% per annum (the "Note"). Messrs. Reschke and Curto
      contributed an aggregate of $50,000 for 100% of the Services Company's
      voting common stock. The Operating Partnership is expected to receive
      approximately 95.0% of the economic benefits of the operations of the
      Services Company by virtue of payments on the Note and distributions in
      respect of its ownership of the Services Company Preferred Stock.
 
    Upon completion of the Offering and the consummation of the Formation
Transactions, the Company owned 63 properties, which consisted of 16 office
properties, 45 industrial properties, one parking facility and one retail center
containing an aggregate of 8.1 net rentable square feet. Between the closing of
the Offering and December 31, 1997, the Company acquired one additional property
and the first mortgage notes of two additional properties. See "Recent
Developments".
 
    The Company currently is involved in only one industry segment, the
ownership, management and development of real estate. Therefore, all of the
financial statements contained herein relate to this industry segment. See
"Financial Statements and Supplementary Data".
 
TAX STATUS
 
    The Company has elected to be taxed as a REIT under Sections 856 through 860
of the Internal Revenue Code of 1986, as amended. As a REIT, the Company
generally will not be subject to federal income tax at the corporate level on
income it distributes to its stockholders so long as it distributes at least 95%
of its taxable income (excluding any net capital gain) each year. Since the
Offering the Company believes that it has complied with the tax regulations to
maintain its REIT status. If the Company fails to qualify as a REIT in any
taxable year, the Company will be subject to federal income tax (including any
applicable alternative minimum tax) on its taxable income at regular corporate
rates. Even if the Company qualifies as a REIT, the Company may be subject to
certain state and local taxes on its income and property.
 
BUSINESS AND GROWTH STRATEGIES
 
    The Properties owned by the Company as of December 31, 1997 contain
approximately 9.9 million rentable square feet. The Company currently intends to
invest primarily in the acquisition, development and redevelopment of commercial
real estate properties located in the (i) Chicago Central Business District
("Chicago CBD") office market, (ii) suburban Chicago office market, (iii)
Chicago Metropolitan Area warehouse/distribution market and (iv) Chicago
Metropolitan Area overhead crane/manufacturing market. The Company's primary
business objective is to achieve sustainable long-term growth in cash flow per
share and to enhance the value of its portfolio through the implementation of
effective operating, acquisition, development and financing strategies. The
Company believes that opportunities exist to increase cash flow per share by:
 
    - contractual rent increases in existing leases;
 
                                       4
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    - leasing all or a portion of the existing vacant space in the Properties;
 
    - acquiring office and industrial properties (or entities that own or
      control such properties) at or below replacement cost and at positive
      spreads to its cost of capital;
 
    - increasing rental and occupancy rates and decreasing tenant concessions as
      vacancy rates in the Company's submarkets generally continue to decline;
 
    - developing office and industrial properties for the benefit of the Company
      where such development will result in a favorable risk-adjusted return on
      investment;
 
    - expanding its property management, leasing and corporate advisory services
      business; and
 
    - using, when available, long-term, tax-exempt bonds (which typically have
      lower interest costs) to finance the acquisition and renovation of
      existing industrial facilities and the development of new industrial
      facilities.
 
    The Company believes that a number of factors will enable it to achieve its
business objectives, including: (a) the opportunity to lease available space at
attractive rental rates because of increasing demand and, with respect to the
Office Properties, the present limited level of new construction in the Chicago
Metropolitan Area; (b) the presence of distressed sellers and inadvertent owners
(through foreclosure or otherwise) of office and industrial properties in the
Company's submarkets, as well as the Company's ability to acquire properties
with Common Units (thereby deferring the seller's taxable gain), all of which
create enhanced acquisition opportunities; and (c) the quality and location of
the Properties.
 
    Management believes that the Company is well-positioned to take advantage of
these opportunities because of its extensive experience in its markets, its
seasoned management team, its significant land holdings and option rights and
its ability to develop, redevelop, lease and efficiently manage office and
industrial properties. In addition, the Company believes that public ownership
and its capital structure will provide the Company with enhanced access to the
public debt and equity capital markets and new opportunities for growth.
 
    OPERATING STRATEGY.  The Company will focus on enhancing its cash flow per
share by: (a) maximizing cash flow from its Properties through contractual rent
increases, pro-active leasing programs and effective property management; (b)
managing operating expenses through the use of in-house management, leasing,
marketing, financing, accounting, legal, construction, management and data
processing functions; (c) maintaining and developing long-term relationships
with a diverse tenant group; (d) attracting and retaining motivated employees by
providing financial and other incentives to meet the Company's operating and
financial goals; and (e) continuing to emphasize value-added capital
improvements to enhance the Properties' competitive advantages in their
submarkets.
 
    ACQUISITION STRATEGY.  The Company will seek to increase its cash flow per
share by acquiring additional office and industrial properties at prices below
replacement cost, including properties that: (a) may provide attractive initial
yields and significant potential for growth in cash flow from property
operations; (b) are well-located, high quality and competitive in their
respective submarkets; (c) are located in the Company's existing submarkets
and/or in other strategic submarkets where the demand for office and industrial
space exceeds available supply; or (d) have been undermanaged or are otherwise
capable of improved performance through intensive management, marketing and
leasing.
 
    The Company plans to concentrate its acquisition activities in the Chicago
Metropolitan Area and, to a lesser extent, in other midwestern markets. The
Company believes that attractive opportunities exist to acquire office and
industrial properties in these markets at prices below replacement cost. Each
acquisition opportunity will be reviewed to evaluate whether it meets one or
more of the following criteria: (a) potential for higher occupancy levels and/or
rents as well as for lower tenant turnover and/or operating expenses; (b)
ability to generate returns in excess of the Company's weighted average cost of
capital, taking
 
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into account the estimated costs associated with renovation and tenant turnover
(I.E., tenant improvements and leasing commissions); and (c) a purchase price at
or below estimated replacement cost.
 
    The Company believes it has certain competitive advantages that enhance its
ability to identify and complete acquisitions on a timely and efficient basis,
including: (a) management's significant local market experience with, and
knowledge of, properties, submarkets and potential tenants; (b) management's
long-standing relationships with commercial real estate brokers and
institutional and other owners of commercial real estate in the Chicago
Metropolitan Area; (c) the Company's fully-integrated real estate operations,
which allow it to quickly evaluate and respond to acquisition opportunities; (d)
the Company's ability to access relatively low-cost financing through the
capital markets; and (e) management's reputation as an experienced purchaser of
office and industrial properties with the ability to execute transactions in an
efficient and timely manner. The Company also believes it could add a number of
office and industrial properties to its portfolio without the need for a
significant increase in general and administrative expenses, due to the
Company's expertise and depth of management and the efficiencies created by its
centralized management structure.
 
    The Company believes that many of the owners of commercial real estate
properties located in the Chicago Metropolitan Area have a low tax basis in
their properties and have the corresponding potential for the recognition of
substantial taxable gains as a result of the disposition of such properties.
Management believes that the Company's capital structure and ability to acquire
properties in exchange for Common Units, and thereby defer a seller's potential
taxable gain, will enhance the ability of the Company to consummate transactions
quickly and to structure more competitive acquisitions than other real estate
companies in the market which lack the Company's access to capital and ability
to acquire property with Common Units.
 
    DEVELOPMENT STRATEGY.  As opportunities arise and where market conditions
support a favorable risk-adjusted return on investment, the Company intends to
pursue opportunities for growth through the development of new office and
industrial properties. The Company believes that the strength and experience of
its management in the development of office and industrial properties will
provide it with a competitive advantage in evaluating and pursuing opportunities
to develop additional properties. During the next few years, the Company expects
that most of its development activities will be focused on suburban office and
industrial properties in the Chicago Metropolitan Area.
 
    Based on ongoing marketing activities and discussions with prospective
tenants, the Company expects that over the next several years there will be
significant demand from several large tenants that are unable to find large
blocks of contiguous Class A office space in downtown Chicago which may lead to
significant office development opportunities. The Company believes that its
significant land holdings and land option rights will provide it with a distinct
advantage in competing for future development opportunities. The Company owns
approximately 83.4 acres and has rights to acquire approximately 157.2 acres of
developable land, which management believes could be developed with
approximately 1.2 million square feet of additional office space in the Chicago
CBD and approximately 4.4 million square feet of additional industrial space
primarily in the Chicago Metropolitan Area. The Company's option rights include
an option to acquire a development site containing approximately 58,000 square
feet known as 300 N. LaSalle in downtown Chicago which, to the extent the
Company is able to obtain significant preleasing commitments for such a project,
the Company believes it could develop as an office or mixed-use project
containing up to approximately 1.2 million net rentable square feet.
 
    The Services Company's corporate advisory activities with third parties are
expected to give the Company further access to future development opportunities.
The Services Company also will continue to undertake build-to-suit projects for
third parties.
 
    FINANCING STRATEGY.  The Company's financing strategy and objectives are
determined by the Company's Board of Trustees. The Company presently intends to
operate with a ratio of debt-to-total market capitalization (defined as the
total debt of the Company as a percentage of the sum of the market value of
 
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issued and outstanding shares, including the Common Units exchangeable for
Common Shares, plus total debt) in the range of 25.0% to 50.0%. The Company also
intends to operate in a manner that will facilitate its ability to secure an
investment grade rating on future unsecured debt. However, such objectives may
be altered without the consent of the Company's shareholders, and the Company's
organizational documents do not limit the amount or type of indebtedness that
the Company may incur.
 
    The Company intends to use one or more sources of capital for future
acquisitions 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 and other debt or
equity securities and other bank and/or institutional borrowings.
 
RECENT DEVELOPMENTS
 
   
    During the period November 17, 1997 through December 31, 1997, the Company
increased its office portfolio from 16 to 19 properties by acquiring one
suburban Milwaukee, Wisconsin property and the first mortgage notes of one
Chicago CBD property and one suburban Chicago property encompassing in total
approximately 1.8 million square feet for an aggregate purchase price of
approximately $172.2 million consisting of $167.2 million in cash and Common
Units with an aggregate value of $5.1 million (representing a 1.1% limited
partnership interest in the Operating Partnership as of December 31, 1997). In
addition, 801 Technology Way was available for occupancy and included in the
Company's industrial portfolio at December 31, 1997.
    
 
    Set forth below is a brief description of the property acquired by the
Company during the period November 17, 1997 through December 31, 1997:
 
    2675 N. MAYFAIR.  2675 N. Mayfair is an office building located in
Wauwatosa, Wisconsin. It contains approximately 102,660 net rentable square feet
of office space. As of December 31, 1997, the property was 96.0% leased to 14
tenants.
 
    The Company also acquired the first mortgage notes encumbering the following
properties during the period November 17, 1997 through December 31, 1997:
 
    CONTINENTAL TOWERS.  Continental Towers consists of three 12-story office
towers in Rolling Meadows, Illinois that contain approximately 916,000 net
rentable square feet of office space. As of December 31, 1997, the property was
99.1% leased to 71 tenants. The operations of Continental Towers have been
consolidated with those of the company for financial statement purposes.
 
    180 N. LASALLE STREET.  180 N. LaSalle Street is a 39-story office building
in the Chicago CBD that contains approximately 729,000 net rentable square feet
of office space. As of December 31, 1997, the property was 81.4% leased to 95
tenants. The operations of 180 N. LaSalle have been reflected as a note
receivable for financial statement purposes.
 
   
    On March 25, 1998, the Company issued and sold 2,579,994 Common Shares in a
private placement to institutional investors. The net proceeds to the Company
from the private placement were approximately $49.25 million, and are expected
to be used for additional property acquisitions. The Company has granted certain
registration rights to the institutional investors with respect to the Common
Shares purchased by them in the private placement.
    
 
COMPETITION
 
    The Company competes with other owners and developers that may have greater
resources and more experience than the Company. Additionally, the number of
competitive properties in any particular market or submarket in which the
Properties are located could have a material adverse effect on both the
Company's ability to lease space at the Properties or any newly-acquired
property and on the rents charged at the Properties. The Company believes that
the Credit Facility and the Company's access as a public
 
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company to the capital markets to raise funds during periods when conventional
sources of financing may be unavailable or prohibitively expensive provide the
Company with substantial competitive advantages. Further, the Company believes
that its capital structure and ability to acquire properties in exchange for
Common Units, and thereby defer a seller's potential taxable gain, enhance the
Company's ability to consummate transactions quickly and to structure more
competitive acquisitions than other real estate companies in the market which
lack the Company's access to capital and ability to acquire property with Common
Units. See "Business and Growth Strategies--Acquisition Strategy". The Company
believes that the number of real estate developers has decreased as a result of
the recessionary market conditions and tight credit markets during the early
1990s as well as the reluctance on the part of more conventional financing
sources to fund development and acquisition projects. In addition, the Company
believes that it is one of a limited number of publicly-traded real estate
companies primarily focusing on the office and industrial market in the Chicago
Metropolitan Area.
 
GOVERNMENT REGULATION
 
    ENVIRONMENTAL MATTERS.  All of the Properties were subject to Phase I or
similar environmental assessments by independent environmental consultants in
connection with the formation of the Company. Phase I assessments are intended
to discover information regarding, and to evaluate the environmental condition
of, the surveyed property and surrounding properties. Phase I assessments
generally include an historical review, a public records review, an
investigation of the surveyed site and surrounding properties, and preparation
and issuance of a written report, but do not include soil sampling or subsurface
investigations.
 
    The Company is aware of environmental contamination at certain of the older
Industrial Properties: the Chicago Enterprise Center (the "CEC"), the East
Chicago Enterprise Center (the "ECEC") and the Hammond Enterprise Center (the
"HEC"), which are already in remediation programs sponsored by the appropriate
state environmental agencies. PGI has contractually agreed to retain liability,
and indemnify the Company, for environmental remediation with regard to these
Industrial Properties, which environmental consultants have estimated will cost,
in the aggregate, up to $3.2 million. Based on such estimates, certain of the
Property Partnerships have recorded provisions for environmental remediation
costs totaling $3.2 million.
 
    The Company also is aware of contamination at 455 Academy Drive, one of the
Contribution Properties. The current tenant of the Property, National Service
Industries, has provided the Company with an indemnity for all of the costs of
environmental remediation regarding the Property caused by National Service
Industries either knowingly or unknowingly. The Company also is aware of
contamination at 1301 E. Tower Road, one of the properties contributed by the
NAC Contributors. The Property has been submitted into a remediation program
sponsored by the Illinois Environmental Protection Agency. The Company's
environmental consultants estimate that the remedial action will cost
approximately $200,000.
 
    The Company believes that the other Properties are in compliance in all
material respects with all federal, state and local laws, ordinances and
regulations regarding hazardous or toxic substances. The Company has not been
notified by any governmental authority, and is not otherwise aware, of any
material noncompliance, liability or claim relating to hazardous or toxic
substances in connection with any of its other Properties. None of the Company's
environmental assessments of the Properties has revealed any environmental
liability that, after giving effect to the contractual indemnities described
above, the Company believes would have a material adverse effect on the
Company's financial condition or results of operations taken as a whole, nor is
the Company aware of any such material environmental liability. Nonetheless, it
is possible that the Company's assessments do not reveal all environmental
liabilities or that there are material environmental liabilities of which the
Company is unaware. Moreover, there can be no assurance that (i) future laws,
ordinances or regulations will not impose any material environmental liability
or (ii) the current environmental condition of the Properties will not be
affected by tenants, by the condition of land or operations in the vicinity of
the Properties (such as the presence of underground
 
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storage tanks) or by third parties unrelated to the Company. If compliance with
the various laws and regulations, now existing or hereafter adopted, exceeds the
Company's budgets for such items, the Company's ability to make expected
distributions to shareholders could be adversely affected.
 
    COSTS OF COMPLIANCE WITH AMERICANS WITH DISABILITIES ACT.  Under the ADA,
all public accommodations and commercial facilities are required to meet certain
federal requirements related to access and use by disabled persons. These
requirements became effective in 1992. Compliance with the ADA requirements
could require removal of access barriers, and noncompliance could result in the
imposition of fines by the federal government or an award of damages to private
litigants. Although the Company believes that the Properties are substantially
in compliance with these requirements, the Company may incur additional costs to
comply with the ADA. Although the Company believes that such costs will not have
a material adverse effect on the Company, if required changes involve a greater
amount of expenditures than the Company currently anticipates, the Company's
ability to make expected distributions could be adversely affected.
 
    OTHER REGULATIONS.  The Properties are also subject to various federal,
state and local regulatory requirements, such as state and local fire and life
safety requirements. Failure to comply with these requirements could result in
the imposition of fines by governmental authorities or awards of damages to
private litigants. The Company believes that the Properties are currently in
material compliance with all such regulatory requirements. However, there can be
no assurance that these requirements will not be changed or that new
requirements will not be imposed which would require significant unanticipated
expenditures by the Company and could have an adverse effect on the Company's
funds from operations and expected distributions.
 
INSURANCE
 
    Management believes that the Properties are covered by adequate
comprehensive liability, rental loss, and all-risk insurance, provided by
reputable companies, with commercially reasonable deductibles, limits and policy
specifications customarily carried for similar properties. There are, however,
certain types of losses which may be either uninsurable or not economically
insurable, such as losses due to floods, riots or acts of war. Should an
uninsured loss occur, the Company could lose both its invested capital in, and
anticipated profits from, the property.
 
EMPLOYEES
 
    As of December 31, 1997, the Company had 226 full-time employees.
 
ITEM 2. PROPERTIES
 
GENERAL
 
    The Company (through the Operating Partnership) owns 19 Office Properties
encompassing an aggregate of approximately 4.1 million net rentable square feet,
45 Industrial Properties encompassing an aggregate of approximately 5.8 million
net rentable square feet, one parking facility with 398 parking spaces and one
retail center. The Properties are owned in fee simple by the respective Property
Partnerships, except for Continental Towers and 180 N. LaSalle. The Company owns
the first mortgage notes of these two properties. Fourteen of the 19 Office
Properties and 38 of the 45 Industrial Properties are located in the Chicago
Metropolitan Area. In the Chicago Metropolitan Area, the most notable Office
Property is the 77 West Wacker Drive Building, a premier 50-story landmark
office tower in downtown Chicago, which contains approximately 944,600 net
rentable square feet. The building has won numerous awards, including, in 1993,
the Sun-Times Real Estate Development of the Year and the Best New Building
Award from Friends of Downtown. Three Office Properties are located in
Knoxville, Tennessee, one Office Property is located in downtown Nashville,
Tennessee, one Office Property is located in the Milwaukee, Wisconsin
metropolitan area, six Industrial Properties are located in the Columbus, Ohio
metropolitan
 
                                       9
<PAGE>
area, the parking facility is located in Knoxville, Tennessee and the retail
center is located in a suburb of Chicago. As of December 31, 1997, the Office
Properties were approximately 91.9% leased to more than 390 tenants, and the
Industrial Properties were approximately 87.5% leased to more than 65 tenants.
 
    Management has developed or redeveloped, leased and managed 38 of the 45
Industrial Properties (79.5%, in terms of net rentable square feet) and 13 of
the 19 Office Properties (69.3%, in terms of net rentable square feet). In the
course of such development and redevelopment, the Company has acquired
experience across a broad range of development and redevelopment projects. For
example, the Company has developed both Office Properties, such as the 77 West
Wacker Drive Building, and Industrial Properties, such as the Contribution
Properties. The Company also has redeveloped both Office Properties, such as 201
4th Avenue in Nashville, and Industrial Properties, such as the CEC, the ECEC
and the HEC, in the Chicago Metropolitan Area. The Company believes that all of
its Properties are well maintained and, based on recent engineering reports, do
not require significant capital improvements.
 
    In addition to its interests in the Office Properties and Industrial
Properties, the Company owns approximately 83.4 acres and has the rights to
acquire an additional 157.2 acres of developable land including rights to
acquire one development site located in the Chicago CBD containing approximately
58,000 square feet. Management believes that approximately 1.2 million square
feet of additional office space in the Chicago CBD and approximately 4.4 million
square feet of additional industrial space, primarily in the Chicago
Metropolitan Area can be developed on this land. The Company also has an option
to acquire one additional industrial property, 901 Technology Way, in the
Libertyville Business Park, in Libertyville, Illinois, from certain of the IBD
Contributors and a 15-year right of first offer to develop all or any portion of
360 acres of undeveloped office and industrial land in the Huntley Business
Park, in Huntley, Illinois, currently owned and controlled by an affiliate of
PGI, subject to a participation interest in such property held by a third-party
lender.
 
                                       10
<PAGE>
    The Office Properties are leased to tenants either on a net basis with
tenants obligated to pay their proportionate share of real estate taxes,
insurance, utility and operating expenses or on a full service basis, with the
landlord responsible for the payment of taxes, insurance and operating expenses
up to the amount incurred during the tenant's first year of occupancy ("Base
Year") or a negotiated amount approximating the tenant's pro rata share of real
estate taxes, insurance and operating expenses ("Expense Stop"). The tenant pays
its pro rata share of increases in expenses above the Base Year or Expense Stop.
Most of the leases for the Industrial Properties are written on a net basis,
with tenants paying their proportionate share of real estate taxes, insurance,
utility and operating expenses.
 
PROPERTIES
 
    The following table sets forth certain information relating to each of the
Properties as of December 31, 1997, unless indicated otherwise. Through the
Operating Partnership, the Company owns a 100% interest in all of the Office
Properties and the Industrial Properties, except for Continental Towers and 180
N. LaSalle. The Company owns the first mortgage notes on these properties.
 
<TABLE>
<CAPTION>
                                                                                              NET       PERCENTAGE
                                                                          YEAR BUILT/      RENTABLE    LEASED AS OF
                  PROPERTY                           LOCATION              RENOVATED      SQUARE FEET   12/31/97(%)
- --------------------------------------------  -----------------------  -----------------  -----------  -------------
<S>                                           <C>                      <C>                <C>          <C>
OFFICE PROPERTIES (OWNED):
  77 West Wacker Drive......................              Chicago, IL               1992     944,556          96.0
  1990 Algonquin Road/2000-2060 Algonquin
    Road (Salt Creek Office Center)(1)......           Schaumburg, IL          1979/1986     125,922          92.0
  1699 E. Woodfield Road (Citibank Office
    Plaza)..................................           Schaumburg, IL               1979     105,400          99.3
  555 Huehl Road............................           Northbrook, IL               1987      74,000         100.0
  201 4th Avenue N..........................            Nashville, TN          1968/1985     250,566          91.0
  620 Market Street.........................            Knoxville, TN               1988      93,711          91.4
  625 Gay Street............................            Knoxville, TN               1988      91,426          90.0
  4823 Old Kingston Pike....................            Knoxville, TN               1988      34,638         100.0
  2675 N. Mayfair...........................            Wauwatosa, WI               1979     102,660          96.0
  941-961 Weigel Drive......................             Elmhurst, IL          1989/1994     123,077         100.0
  4100 Madison Street.......................             Hillside, IL               1978      24,536          58.2
  350 N. Mannheim Road......................             Hillside, IL          1977/1987       4,850        --
  1600-1700 167th Street....................         Calumet City, IL               1981      65,394          59.5
  4343 Commerce Court.......................                Lisle, IL               1989     170,708          90.0
  1301 E. Tower Road........................           Schaumburg, IL               1992      50,400         100.0
  280 Shuman Blvd...........................           Naperville, IL               1979      65,001          97.0
  2205-2255 Enterprise Drive................          Westchester, IL               1987     129,574          97.0
OFFICE PROPERTIES (FOR WHICH THE COMPANY
  OWNS A MORTGAGE NOTE):
  Continental Towers (2)....................      Rolling Meadows, IL          1977/1981     916,000          99.1
  180 N. LaSalle (3)........................              Chicago, IL          1982/1998     729,000          81.4
                                                                                          -----------        -----
  Office Properties Subtotal................                                               4,101,419          91.9
                                                                                          -----------        -----
INDUSTRIAL PROPERTIES:
WAREHOUSE/DISTRIBUTION FACILITIES:
  425 E. Algonquin Road.....................    Arlington Heights, IL               1978     304,506         100.0
  1001 Technology Way.......................         Libertyville, IL               1996     212,831         100.0
  3818 Grandville/1200 Northwestern.........               Gurnee, IL          1961/1990     345,232         100.0
  306-310 Era Drive.........................           Northbrook, IL               1984      36,495         100.0
  2160 McGaw Road...........................                Obetz, OH               1974     310,100         100.0
  4849 Groveport Road.......................                Obetz, OH               1968     132,100         100.0
</TABLE>
 
                                       11
<PAGE>
<TABLE>
<CAPTION>
                                                                                              NET       PERCENTAGE
                                                                          YEAR BUILT/      RENTABLE    LEASED AS OF
                  PROPERTY                           LOCATION              RENOVATED      SQUARE FEET   12/31/97(%)
- --------------------------------------------  -----------------------  -----------------  -----------  -------------
<S>                                           <C>                      <C>                <C>          <C>
  2400 McGaw Road...........................                Obetz, OH               1972      86,400         100.0
  5160 Blazer Memorial Parkway (4)..........               Dublin, OH               1983      85,962          66.8
  600 London Road...........................             Delaware, OH               1981      52,441         100.0
  1401 S. Jefferson.........................              Chicago, IL          1965/1985      17,265         100.0
  1051 N. Kirk Road.........................              Batavia, IL               1990     120,004         100.0
  4211 Madison Street.......................             Hillside, IL          1977/1992      90,344         100.0
  200 E. Fullerton Avenue...................         Carol Stream, IL          1968/1995      66,254         100.0
  350 Randy Road............................         Carol Stream, IL               1974      25,200          87.5
  4248, 4250 and 4300 Madison Street........             Hillside, IL               1980     127,129         100.0
  370 Carol Lane............................             Elmhurst, IL          1977/1994      60,290         100.0
  388 Carol Lane............................             Elmhurst, IL               1979      40,920          88.4
  342-346 Carol Lane........................             Elmhurst, IL               1989      67,935         100.0
  343 Carol Lane............................             Elmhurst, IL               1989      30,084         100.0
  4160-4190 Madison Street..................             Hillside, IL          1974/1992      79,532         100.0
  11039 Gage Avenue.........................        Franklin Park, IL          1965/1993      21,935         100.0
  11045 Gage Avenue.........................        Franklin Park, IL          1970/1992     136,600         100.0
  550 Kehoe Blvd............................         Carol Stream, IL               1997      44,575         100.0
  475 Superior Avenue.......................              Munster, IN               1989     450,000         100.0
  801 Technology Way........................         Libertyville, IL               1997      68,824          63.4
OVERHEAD CRANE/MANUFACTURING FACILITIES:
  1301 Ridgeview Drive......................              McHenry, IL               1995     217,600         100.0
  515 Huehl Road/500 Lindberg...............           Northbrook, IL               1988     201,244         100.0
  455 Academy Drive.........................           Northbrook, IL               1976     105,444         100.0
  4411 Marketing Place......................            Groveport, OH               1984      65,804         100.0
Chicago Enterprise Center...................              Chicago, IL     1916/1991-1996
  13535-A S. Torrence Avenue................                                                 384,806          37.9
  13535-B S. Torrence Avenue................                                                 239,752         100.0
  13535-C S. Torrence Avenue................                                                  99,333         100.0
  13535-D S. Torrence Avenue................                                                  77,325         100.0
  13535-E S. Torrence Avenue................                                                  57,453          15.3
  13535-F S. Torrence Avenue................                                                  44,800         100.0
  13535-G S. Torrence Avenue................                                                  54,743        --
  13535-H S. Torrence Avenue................                                                  73,612          56.3
East Chicago Enterprise Center..............         East Chicago, IN     1917/1991-1997
  Building 2 (4407 Railroad Avenue).........                                                 169,435        --
  Building 3 (4407 Railroad Avenue).........                                                 291,550         100.0
  Building 4 (4407 Railroad Avenue).........                                                  87,483          98.1
  4440 Railroad Avenue (5)..................                                                  40,000         100.0
  4635 Railroad Avenue......................                                                  14,070        --
Hammond Enterprise Center...................              Hammond, IN          1920-1952
  4507 Columbia Avenue......................                                                 256,595          98.8
  4527 Columbia Avenue (6)..................                                                  16,701          62.8
  4531 Columbia Avenue......................                                                 250,266          74.1
Industrial Properties Subtotal..............                                               5,760,974          87.9
                                                                                          -----------        -----
Portfolio Total.............................                                               9,862,393          89.6
                                                                                          -----------        -----
                                                                                          -----------        -----
OTHER PROPERTIES:
  398 Unit Parking Facility.................            Knoxville, TN               1981
  371-385 N. Gary Avenue (7)................         Carol Stream, IL               1978      11,276
</TABLE>
 
                                       12
<PAGE>
- ------------------------
 
(1) This property complex is comprised of 1990 Algonquin Road (a two-story
    office building) and 2000-2060 Algonquin Road (seven single-story office
    buildings), but is treated as one Office Property.
 
(2) The Company holds a mortgage note receivable on the property and has
    consolidated the underlying property operations.
 
(3) The Company holds a mortgage note receivable on the property. The operating
    results of this property have not been consolidated with the operating
    results of the Company.
 
(4) This property is a mixed use Industrial/Office Property that has been
    classified as an Industrial Property.
 
(5) This property is an office building adjacent to the East Chicago Enterprise
    Center.
 
(6) This property is an office building within the Hammond Enterprise Center.
 
(7) This is a retail center.
 
ITEM 3.  LEGAL PROCEEDINGS
 
    The Company is not presently subject to any material litigation nor, to the
Company's knowledge, is any material litigation threatened against the Company,
other than routine litigation arising in the ordinary course of business, some
of which is expected to be covered by liability insurance and all of which
collectively is not expected to have a material adverse effect on the
consolidated financial statements of the Company.
 
ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITYHOLDERS
 
    No matters were submitted to a vote of stockholders during the period from
November 17, 1997 (inception) through December 31, 1997.
 
                                       13
<PAGE>
                                    PART II
 
ITEM 5.  MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED
       STOCKHOLDER MATTERS
 
   
    The Common Shares began trading on the New York Stock Exchange ("NYSE") on
November 12, 1997, under the symbol "PGE". On March 2, 1998, the reported
closing sale price on the NYSE was $20 1/2, and there were approximately 4,100
holders of record of Common Shares. The following table sets forth the high and
low closing sales prices per Common Share reported on the NYSE and the
distribution paid by the Company for the period from November 17, 1997 through
December 31, 1997.
    
 
<TABLE>
<CAPTION>
                                                                                    HIGH        LOW     DISTRIBUTION
                                                                                  ---------  ---------  -----------
<S>                                                                               <C>        <C>        <C>
December 31, 1997 (from November 17, 1997)......................................    20 5/16     19 1/2   $.16644(1)
</TABLE>
 
- ------------------------
 
(1) The Company paid a distribution of $.16644 per share of Common Stock on
    January 23, 1998, to stockholders of record on December 31, 1997. That
    distribution was for the period from November 17, 1997 through December 31,
    1997 and is equivalent to a quarterly distribution of $.3375 and an annual
    distribution of $1.35.
 
    Concurrently with the completion of the Offering and consummation to the
Formation Transactions, the Operating Partnership issued 9,994,310 Common Units
to PGI, the Primestone Joint Venture, the IBD Contributors, the NAC Contributors
and certain members of management of the Company. In addition, the Operating
Partnership issued 256,572 Common Units as partial consideration in the
acquisition of the first mortgage note of 180 N. LaSalle, which was purchased by
the Company subsequent to the Offering. Holders of the Common Units may redeem
part or all of the Common Units for Common Shares on a one-for-one basis, or at
the option of the Company, cash equal to the fair market value of a Common Share
at the time of exchange. This exchange right may not be exercised prior to the
first anniversary of the consummation of the Offering.
 
   
    Additionally with the completion of the Offering and consummation of the
Formation Transactions, the Company issued 2,000,000 cumulative convertible
preferred shares of beneficial interest, $0.01 par value per share (the
"Convertible Preferred Shares") in a private placement to Security Capital
Preferred Growth Incorporated. Holders of the Convertible Preferred Shares may
convert them to Common Shares on September 17, 1998 or upon the occurrence of
certain events.
    
 
    The issuance of Common Units and the Convertible Preferred Shares pursuant
to the Formation Transactions constitutes private placements of securities which
are exempt from the registration requirements of the Securities Act of 1933, as
amended, pursuant to Section 4(2) thereof.
 
                                       14
<PAGE>
ITEM 6.  SELECTED FINANCIAL DATA
 
   
    The following table sets forth the selected consolidated/combined financial
data for the Company and the Predecessor Properties (in thousands except per
share amounts) and should be read in conjunction with the consolidated/combined
financial statements included elsewhere in this Form 10-K.
    
 
<TABLE>
<CAPTION>
                                                                    (IN THOUSANDS, EXCEPT PER SHARE DATA)
                                                   ------------------------------------------------------------------------
                                                     COMPANY -
                                                   CONSOLIDATED
                                                    HISTORICAL           PREDECESSOR PROPERTIES--COMBINED HISTORICAL
                                                   -------------  ---------------------------------------------------------
                                                    PERIOD FROM    PERIOD FROM
                                                   NOVEMBER 17,    JANUARY 1,
                                                   1997 THROUGH   1997 THROUGH            YEAR ENDED DECEMBER 31,
                                                   DECEMBER 31,   NOVEMBER 16,   ------------------------------------------
                                                       1997           1997         1996       1995       1994       1993
                                                   -------------  -------------  ---------  ---------  ---------  ---------
<S>                                                <C>            <C>            <C>        <C>        <C>        <C>
STATEMENTS OF OPERATIONS DATA:
REVENUE:
    Rental.......................................    $   7,293      $  27,947    $  30,538  $  33,251  $  30,352  $  28,177
    Tenant reimbursements........................        2,041         12,490       14,225     14,382     12,451     10,750
    Insurance settlement.........................       --             --           --          7,257     --         --
    Other........................................          496          1,515        3,397      2,715      3,170      1,527
                                                        ------    -------------  ---------  ---------  ---------  ---------
    Total revenue................................        9,830         41,952       48,160     57,605     45,973     40,454
                                                        ------    -------------  ---------  ---------  ---------  ---------
EXPENSES:
    Property operations..........................        2,213          8,622        9,767      9,479      8,852      8,452
    Real estate taxes............................        1,765          8,575        9,383      9,445      9,057      7,167
    Depreciation and amortization................        2,478         11,241       12,409     12,646     11,624     11,739
    Interest.....................................        1,680         24,613       26,422     27,671     25,985     22,827
    Interest--affiliate..........................       --              9,804       10,795      8,563      7,402      6,335
    Property and asset management fee--
      affiliate..................................       --              1,348        1,561      1,496      1,388      1,106
    Financing fees...............................       --              1,180        1,232     --         --         --
    General and administrative...................          267          2,414        4,927      4,508      3,727      3,657
    Provision for environmental remediation
      costs......................................       --              3,205       --         --         --         --
    Write-off of deferred tenant costs...........       --             --            3,081     13,373     --         --
                                                        ------    -------------  ---------  ---------  ---------  ---------
    Total expenses...............................        8,403         71,002       79,577     87,181     68,035     61,283
                                                        ------    -------------  ---------  ---------  ---------  ---------
    Income (loss) before minority interest and
      extraordinary item.........................        1,427        (29,050)     (31,417)   (29,576)   (22,062)   (20,829)
    Minority interest............................         (635)           666          894      3,281      5,393     10,531
                                                        ------    -------------  ---------  ---------  ---------  ---------
    Net income (loss) before extraordinary item..          792        (28,384)     (30,523)   (26,295)   (16,669)   (10,298)
    Extraordinary (loss) gain on early
      extinguishment of debt, net of minority
      interests' share in the amount of $1,127...       --             65,990       --         --         --         --
                                                        ------    -------------  ---------  ---------  ---------  ---------
    Net income (loss)............................          792      $  37,606    $ (30,523) $ (26,295) $ (16,669) $ (10,298)
                                                                  -------------  ---------  ---------  ---------  ---------
                                                                  -------------  ---------  ---------  ---------  ---------
    Net income allocated to preferred
      shareholders...............................          345
                                                        ------
    Net income available to common
      shareholders...............................    $     447
                                                        ------
                                                        ------
    NET INCOME AVAILABLE PER WEIGHTED AVERAGE
      COMMON SHARE OF BENEFICIAL INTEREST-- BASIC
      AND DILUTED (1)............................    $    0.04
                                                        ------
                                                        ------
</TABLE>
 
                                       15
<PAGE>
 
<TABLE>
<CAPTION>
                                                                            (IN THOUSANDS)
                                                       --------------------------------------------------------
                                                        COMPANY -         PREDECESSOR PROPERTIES--COMBINED
                                                       CONSOLIDATED                  HISTORICAL
                                                        HISTORICAL                  DECEMBER 31,
                                                       DECEMBER 31,  ------------------------------------------
                                                           1997        1996       1995       1994       1993
                                                       ------------  ---------  ---------  ---------  ---------
<S>                                                    <C>           <C>        <C>        <C>        <C>
BALANCE SHEET DATA:
  Real estate assets, before accumulated
    depreciation.....................................   $  589,279   $ 291,757  $ 289,558  $ 285,687  $ 281,316
  Total assets.......................................      741,468     325,230    343,641    356,421    357,158
  Mortgages notes and bonds payable..................      328,044     421,983    405,562    388,309    361,832
  Total liabilities..................................      370,192     447,927    434,993    421,257    397,539
  Minority interest..................................      147,207      (6,905)    (6,047)       886    (11,527)
  Shareholders' equity (partners' deficit)...........      224,069    (115,792)   (85,305)   (65,722)   (28,854)
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                (IN THOUSANDS)
                                                       -----------------------------------------------------------------
                                                        COMPANY -
                                                       CONSOLIDATED
                                                        HISTORICAL       PREDECESSOR PROPERTIES--COMBINED HISTORICAL
                                                       ------------  ---------------------------------------------------
                                                       PERIOD FROM   PERIOD FROM
                                                       NOVEMBER 17,   JANUARY 1,
                                                       1997 THROUGH  1997 THROUGH         YEAR ENDED DECEMBER 31,
                                                       DECEMBER 31,  NOVEMBER 16,  -------------------------------------
                                                           1997          1997         1996         1995         1994
                                                       ------------  ------------  -----------  -----------  -----------
<S>                                                    <C>           <C>           <C>          <C>          <C>
OTHER DATA:
Funds from Operations(2).............................   $    3,964    $  (14,461)  $   (17,367) $   (12,733) $   (12,930)
Cash flows provided by (used in):
  Operating activities...............................        6,658        (5,700)       (3,165)      (1,259)     (13,875)
  Investing activities...............................     (353,816)       (2,467)        1,126       (9,176)      (6,495)
  Financing activities...............................      335,390         6,331         5,733       10,873       15,422
Office Properties:
  Square footage.....................................    4,101,419     2,353,759     1,414,897    1,414,897    1,414,897
  Occupancy (%)......................................         91.9          88.0          92.5         95.8         93.7
Industrial Properties:
  Square footage.....................................    5,760,974     5,696,355     2,462,430    2,551,624    2,547,388
  Occupancy (%)......................................         87.9          87.9          73.5         72.9         62.3
</TABLE>
 
- ------------------------
 
(1) Net income available per weighted-average common share of beneficial
    interest--basic and diluted equals net income divided by the 12,593,000
    Common Shares. See Note 9 to the Company's consolidated financial statements
    for further information.
 
(2) As defined by the National Association of Real Estate Investment Trusts
    ("NAREIT"), Funds from Operations represents net income (loss) before
    minority interest of holders of Common Units (computed in accordance with
    GAAP), excluding gains (or losses) from debt restructuring and sales of
    property, plus real estate related depreciation and amortization (excluding
    amortization of deferred financing costs) and after adjustments for
    unconsolidated partnerships and joint ventures. Non-cash adjustments to
    Funds from Operations were as follows: in all periods, depreciation and
    amortization, for the period from January 1, 1997 through November 16, 1997,
    provision for environmental remediation cost, for the years ended December
    31, 1996, 1995, 1994, gains on the sale of real estate, for the years ended
    December 31, 1996 and 1995, write-off of deferred tenant costs, for the year
    ended December 31, 1995, excess proceeds from insurance claims, and for the
    year ended December 31, 1994, lease termination fees. Management considers
    Funds from Operations an appropriate measure of performance of an office
    and/or industrial REIT because industry analysts have accepted it as such.
    The Company 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 expects to report rental revenues
    on a cash basis, rather than a straight-line GAAP basis,
 
                                       16
<PAGE>
    which the Company believes will result 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. 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 for net income as a measure of profitability nor is it
    comparable to cash flows provided by operating activities determined in
    accordance with GAAP.
 
ITEM 7.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
       AND RESULTS OF OPERATIONS
 
OVERVIEW
 
    The following discussion should be read in conjunction with the historical
consolidated financial statements of the Company and the combined financial
statements of the Predecessor Properties and related notes thereto included
elsewhere in this Form 10-K.
 
    PGI, through the PGI Partnerships which own the Predecessor Properties,
engaged in the ownership, management, operation, and leasing of commercial
office and industrial properties located in the Chicago Metropolitan Area. On
November 17, 1997, following completion of the Offering and the consummation of
the Formation Transactions, the Company owned 63 properties (including the
Predecessor Properties, the Contribution Properties and the Acquisition
Properties) and succeeded to the office and industrial real estate business of
PGI and certain of its affiliates.
 
    The Company owns all of its interests in the Properties through its
investment in the Operating Partnership. At December 31, 1997 the Company's
portfolio of real estate properties included 19 office properties and 45
industrial properties containing an aggregate of approximately 9.9 million net
rentable square feet.
 
    During the period from November 17, 1997 to December 31, 1997, the Company
acquired one office property and the first mortgage notes of two properties,
encompassing approximately 1.8 million square feet.
 
    Income is derived primarily from rental revenue (including tenant
reimbursements) from owned properties supplemented by interest income on
mortgage notes owned. The Company expects that revenue growth over the next
several years will come from a combination of additional acquisitions and
revenue generated through increased rental and occupancy rates in the current
portfolio.
 
CAUTIONARY STATEMENTS
 
    The following discussion in "Management's Discussion and Analysis of
Financial Condition and Results of Operations" contain certain forward-looking
statements within the meaning of the Private Securities Litigation Reform Act of
1995 which reflect management's current views 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 the Company's financial performance; the risk that the Company may be
unable to finance its planned acquisition and development activities; risks
related to the industrial and office industry in which the Company'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 the Company'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
 
                                       17
<PAGE>
adverse impact of changes in the local economic climate on the revenues and the
value of the Company's properties.
 
RESULTS OF OPERATIONS
 
    The following analysis provides a comparison of the property operations for
the years ended December 31, 1997 and 1996. The period from January 1, 1997
through November 16, 1997 records the activity of the Predecessor Properties and
the period from November 17, 1997 through December 31, 1997 records the activity
of the Company.
 
    YEAR ENDED DECEMBER 31, 1997 COMPARED TO YEAR ENDED DECEMBER 31, 1996
 
    Total revenue increased $3.6 million, or 7.5%, to $51.8 million for the year
ended December 31, 1997 compared to $48.2 million for the year ended December
31, 1996 primarily due to the addition of the activity of the Acquisition and
Contribution Properties. Rental revenue increased $4.7 million, or 15.4%, to
$35.2 million in 1997 from $30.5 million in 1996. In 1997, rental revenue from
the Office Properties increased $3.2 million, or 13.0%, to $27.9 million from
$24.7 million in 1996. In 1997, rental revenue from the Industrial Properties
increased $1.5 million, or 25.9%, to $7.3 million from $5.8 million in 1996.
Tenant reimbursements increased $0.3 million, or 2.1%, to $14.5 million in 1997
from $14.2 million in 1996. Tenant reimbursements from the Office Properties
remained consistent at $12.1 million for both 1997 and 1996. During 1996 Keck,
Mahin & Cate ("Keck") paid no tenant reimbursements until a final restructuring
agreement was reached in late 1996. During 1997, Keck paid $0.6 million of
tenant reimbursements. Tenant reimbursements from the Industrial Properties
increased $0.3 million, or 14.3%, to $2.4 million in 1997 from $2.1 million in
1996. Other nonrecurring items recorded in 1996 resulted in a net decrease of
$1.4 million, or 41.2%, in all other revenue to $2.0 million in 1997 from $3.4
million in 1996. Included in the historical financials of the Company , related
to the period from November 17, 1997 to December 31, 1997 are rental revenues of
$3.5 million, tenant reimbursements of $0.8 million and $0.4 million of other
revenue related to the contribution and Acquisition Properties.
 
    Total expenses decreased $0.2 million, or 0.3%, to $79.4 million for the
year ended December 31, 1997 compared to $79.6 million for the year ended
December 31, 1996. Property operating expenses increased $1.0 million, or 11.2%,
to $10.8 million in 1997 from $9.8 million in 1996. In 1997, property operating
expenses from the Office Properties increased $1.6 million, or 19.5%, to $9.8
million for the year ended December 31, 1997 compared to $8.2 million for the
year ended December 31, 1996. The property operating expenses from the
Industrial Properties decreased $0.6 million, or 37.5%, to $1.0 million for the
year ended December 31, 1997 compared to $1.6 million for the year ended
December 31, 1996. In 1997, real estate tax expenses increased $1.0 million, or
10.6%, to $10.4 million from $9.4 million in 1996 primarily due to higher
property assessments in 1997. In 1997, total interest expense decreased $1.1
million, or 3.0%, to $36.1 million from $37.2 million in 1996 primarily due to
the paydown of the 77 West Wacker Mortgage note agreement. In 1997, general and
administrative expenses decreased $2.2 million, or 44.5%, to $2.7 million from
$4.9 million in 1996 primarily due to the nonrecurring expenses recorded in the
last six months of 1996. In 1997, the Industrial Properties recorded a provision
for environmental remediation costs of $3.2 million, which represents the
probable costs to be incurred for the clean-up of environmental contamination at
the properties. PGI has contractually agreed to indemnify the Company from any
environmental liabilities the PGI Partnerships may have incurred and has pledged
$1.0 million and approximately 485,000 partnership units in an operating
partnership that can be converted to common shares of a publicly traded real
estate investment trust to cover these costs. Other expenses decreased $2.1
million on a net basis in 1997 from $18.3 million in 1996 compared to $16.2
million in 1997 primarily due to the write-off of deferred tenant costs in 1996.
Included in the historical financials of the Company, related to the period from
November 17, 1997 to December 31, 1997, are property operating expenses of $0.6
million, real estate tax expense of $0.6 million, interest expense of $1.3
million and general and administrative expense of $0.7 million related to the
Contribution Properties and Acquisition Properties.
 
                                       18
<PAGE>
    In 1997, net income allocated to minority interest increased $2.0 million,
or 222.2%, to $1.1 from ($0.9 million) in 1996, primarily due to an
extraordinary gain resulting from early extinguishment of debt.
 
    In 1997, net income of $38.4 million was reported compared to a loss of
$30.5 million in 1996, primarily due to the changes described above and the
extraordinary gain on early extinguishment of debt of $65,990, net of minority
interest, recorded in 1997.
 
    YEAR ENDED DECEMBER 31, 1996 COMPARED TO YEAR ENDED DECEMBER 31, 1995
 
    Total revenue decreased $9.4 million, or 16.3%, to $48.2 million for the
year ended December 31, 1996 as compared to $57.6 million for the year ended
December 31, 1995. This decrease was primarily due to the realization of a $7.3
million gain in 1995 from a non-recurring insurance settlement payment to the
Company relating to fire damage to one of the Industrial Properties. Total
rental revenue decreased $2.8 million, or 8.4%, to $30.5 million in 1996 from
$33.3 million in 1995. In 1996, rental revenue from Office Properties decreased
$3.8 million, or 13.3%, to $24.7 million from $28.5 million in 1995 primarily
due to the restructuring of Keck's lease. The restructuring resulted in a
decrease in the average percentage of office space leased from 94.7% in 1995 to
94.1% in 1996 leased and a decrease in net rent per leased square foot from
$21.40 in 1995 to 18.74 in 1996. In 1996, rental revenue from Industrial
Properties increased $1.0 million, or 20.8%, to $5.8 million from $4.8 million
in 1995 primarily due to increased average percentage leased (73.2% in 1996 and
67.6% in 1995) and net rent per leased square foot ($3.18 in 1996 and $2.77 in
1995). Tenant reimbursements decreased $0.2 million, or 1.4%, to $14.2 million
in 1996 from $14.4 million in 1995. In 1996, tenant reimbursements from Office
Properties decreased $0.4 million, or 3.2%, to $12.1 million from $12.5 million
in 1995 primarily due to the restructuring of Keck's lease. In 1996, tenant
reimbursements from Industrial Properties increased $0.3 million, or 16.6%, to
$2.1 million from $1.8 million in 1995 primarily due to the increased occupancy
described above. In 1995, one of the Industrial Properties received a final
insurance settlement of $7.3 million related to a fire that destroyed the
Property. No such proceeds were received in 1996. Other revenue increased to
$2.2 million in 1996 from $1.6 million in 1995 primarily due to a $0.6 million
increase in interest income. All other revenue amounts remained comparable
between 1996 and 1995.
 
    Total expenses decreased $7.6 million, or 8.7%, to $79.6 million for the
year ended December 31, 1996 compared to $87.2 million for the year ended
December 31, 1995. This decrease was primarily due to the fact that in 1995 the
Company booked a $13.3 million write-off of deferred tenant costs as part of the
restructuring of the Keck lease and only $3.1 million of such write-offs for
Keck was booked in 1996. Property operating expenses increased $0.3 million, to
$9.8 million in 1996 from $9.5 million in 1995. Property operating expenses from
Office Properties remained constant at $8.2 million in both 1996 and 1995.
Although there was a decline in Office Properties' occupancy in 1996, property
operations were at such a level that a decline in occupancy had a minimal effect
on the overall property operations. In 1996, property operating expenses from
Industrial Properties decreased $0.1 million, or 7.6%, to $1.2 million. In 1996,
depreciation and amortization expense decreased $0.2 million, or 1.6%, to $12.4
million primarily due to the restructuring of Keck's lease. This decrease was
offset by an increase in occupancy and additional tenant improvements at the
Industrial Properties. In 1996, total interest expense increased $1.0 million,
or 2.8%, to $37.2 million primarily due to a $16.4 million increase in
outstanding debt during May 1996. Financing fees increased $1.2 million in 1996
due to a letter of credit facility obtained in 1996 on behalf of the Industrial
Properties. In 1996, general and administrative expenses increased $0.4 million,
or 8.9%, to $4.9 million primarily due to a $0.5 million allowance for
uncollectible tenant receivables due from the restructured lease with Keck
recorded in 1996. All other expenses remained comparable between 1996 and 1995.
 
    In 1996, loss allocated to minority interest decreased $2.4 million, or
74.4%, to $0.9 million from $3.3 million in 1995 primarily due to a reduction of
the minority interest's ownership in the Prime Properties during 1995.
 
                                       19
<PAGE>
    Net loss increased $4.2 million to $30.5 million in 1996 compared to a net
loss of $26.3 million in 1995, primarily due to the changes described above.
 
LIQUIDITY AND CAPITAL RESOURCES
 
    CREDIT FACILITY.  The Company has a Credit Facility of $235.0 million from
BankBoston, N.A. and Prudential Securities Credit Corporation ("PSCC"), which is
secured by first mortgages on certain properties owned by the Operating
Partnership. Subject to compliance by the Company with the applicable loan
covenants, the Credit Facility may be used to provide funds for acquisitions and
development activities and to provide the replacement letters of credit for the
$74.5 million of Tax-Exempt Bonds.
 
    MORTGAGE NOTES.  The Company borrowed $83.5 million aggregate principal
amount from PSCC under the Mortgage Notes at the date of the Offering. PSCC
agreed to provide the Mortgage Notes financing for a 90-day term, convertible at
the option of the Company into a seven-year term, subject to certain conditions.
The Mortgage Notes consist of two separate notes secured, respectively, by first
mortgages on all of the IBD Properties and all of the NAC Properties, together
in each case, with certain of the Acquisition Properties. Interest on the
Mortgage Notes accrues at a rate equal to seven-year U.S. Treasury Notes, plus
1.27%. Prior to the expiration of the Mortgage Notes, the Company expects to
refinance the Mortgage Notes with a seven to ten year loan. On March 23, 1998,
the Company refinanced the notes on the IBD Properties with a loan of $29.4
million which matures on March 23, 2008 to refinance one of the notes. Interest
on this loan accrues at a rate of 6.85% and is payable monthly. The Company
expects to refinance the second note during April 1998.
 
    ANALYSIS OF LIQUIDITY AND CAPITAL RESOURCES.
 
    The Company expects to meet its short-term liquidity requirements through
net cash provided by operations. The Properties require periodic investments of
capital for tenant-related capital expenditures and for general capital
improvements. Over the past three years, the Company's recurring tenant
improvements and leasing commissions for the Predecessor Properties averaged
$7.13 per square foot of leased office space and $0.49 per square foot of leased
industrial space per year. The Company's estimated annual cost of recurring
tenant improvements and leasing commissions is approximately $7.2 million based
upon average annual square feet for leases expiring during the years ending
December 31, 1997 through December 31, 2000. The Company's cost of general
capital improvements to the Properties averages approximately $0.8 million
annually based upon an estimate of $0.08 per square foot.
 
    The Company expects to meet its long-term liquidity requirements for the
funding of property development, property acquisitions and other non-recurring
capital improvements through a combination of net cash from operations,
long-term secured and unsecured indebtedness (including the Credit Facility) and
the issuance of additional equity securities. The terms of the Credit Facility
and the Preferred Shares impose restrictions on the Company's ability to incur
indebtedness and issue additional preferred shares.
 
HISTORICAL CASH FLOWS
 
    Historically, the Predecessor Properties' principal sources of funding for
operations and capital expenditures were from debt financings. PGI incurred net
losses before extraordinary items in each of the last five years. However, after
adding back depreciation and amortization, the Predecessor Properties have
generated positive net operating cash flows for each of the last four years.
 
    The Company and the Predecessor Properties had combined net cash provided by
operating activities of $1.0 million for the year ended December 31, 1997 and
the Predecessor Properties had net cash used in operating activities of $3.2
million and $1.3 million for the years ended December 31, 1996 and 1995,
respectively. The $4.2 million increase in net cash provided by operating
activities for the year ended December 31, 1997 from the year ended December 31,
1996 was primarily due to a $68.9 million increase
 
                                       20
<PAGE>
in net income, a $1.3 million decrease in tenant receivables from
straight-lining rent, a $0.6 million decrease in gain on sale of real estate, a
$1.3 million increase in depreciation and amortization expense, a $0.9 million
decrease in loss allocated to minority interest, a $7.7 million increase in
accrued real estate taxes and a $9.3 million increase in accounts payable and
accrued expenses, offset by a $0.2 million decrease in interest added to
principal, a $3.1 million decrease in the write-off of deferred tenant costs, a
$66.0 million increase in extraordinary item, a $2.9 million increase in tenant
receivables, a $0.8 million increase in deferred costs, a $10.1 million increase
in other assets, a $1.6 million decrease in accrued interest and a $1.1 million
increase in other liabilities. The $1.9 million increase in net cash used in
operating activities for the year ended December 31, 1996 from the year ended
December 31, 1995 is primarily due to a $12.1 million increase in loss before
minority interest (exclusive of the write-off of deferred tenant costs in 1995
and 1996), offset by a $8.1 million decrease in the adjustment related to the
straight-lining of rent and a $1.6 million increase in interest added to
principal on mortgage note payable-affiliate.
 
    The Company and the Predecessor Properties had combined net cash used in
investing activities of ($356.3 million) for the year ended December 31, 1997
and the Predecessor Properties had net cash provided by (used in) investing
activities of $1.1 million and ($9.2 million) for the years ended December 31,
1996 and 1995, respectively. The $357.4 million increase in net cash used in
investing activities for the year ended December 31, 1997 from the year ended
December 31, 1996 was primarily due to a $1.8 million decrease in proceeds from
the sale of real estate, a $298.8 million increase in real estate expenditures,
a $51.2 million purchase of a mortgage note receivable, a $5.2 million increase
in amounts due from affiliates and a $0.4 million cash contribution to the
Services Company. The $10.3 million increase in net cash provided by investing
activities for the year ended December 31, 1996 from the year ended December 31,
1995 was primarily due to an $8.1 million net repayment of advances to
affiliates, a $1.2 million increase in proceeds from sale of real estate and a
$10.0 million decrease in real estate expenditures.
 
    The Company and the Predecessor Properties had combined net cash provided by
financing activities of $361.7 million for the year ended December 31,1997 and
the Predecessor Properties had net cash provided by financing activities of $5.7
million and $10.9 million for the years ended December 31, 1996 and 1995,
respectively. The $356.0 million increase in net cash provided by financing
activities for the year ended December 31, 1997 from the year ended December 31,
1996 was primarily due to $272.0 million in net proceeds from the Offering,
Private Placement and overallotment, $85.0 million from the sale of Operating
Partnership units, a $242.4 million increase in proceeds from mortgage notes
payable, and a $44.3 million increase in contributions from partners, offset by
a $235.7 increase in the repayment of mortgage notes payable, a $46.1 million
increase in the repayment of mortgage notes payable affiliates, the payment of
$5.0 million of deferred financing costs and debt termination fees and a $0.5
million decrease in due to affiliates. The $5.2 million decrease in net cash
provided by financing activities from the year ended December 31, 1996 from the
year ended December 31, 1995 was primarily due to a $5.4 million decrease in
proceeds from mortgage notes payable, offset by a $0.2 million decrease in
distributions to partners.
 
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. The Company 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
 
                                       21
<PAGE>
in the audited Combined Financial Statements and selected financial data
included elsewhere in this Form 10-K. The Company 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 expects to
report rental revenues on a cash basis, rather than a straight-line GAAP basis,
which the Company believes will result in a more accurate presentation of its
actual operating activities), which may differ from the methodology for
calculating Funds from Operations used by other certain office and/or industrial
REITs and, accordingly, may not be comparable to such other REITs. As a result
of the Company'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 the Company's performance or to cash flows as a measure of
liquidity or the ability to pay dividends or make distributions.
 
IMPACT OF YEAR 2000
 
    In the year 2000, many existing computer programs that use only two digits
(rather than four) to identify a year in the date field could fail or create
erroneous results if not corrected. This computer flaw is expected to affect
virtually all companies and organizations . The Company cannot quantify the
potential costs and uncertainties associated with this computer program flaw at
this time, but does not anticipate that the effect of this computer program flaw
on the operations of the Company will be significant. However, the Company may
be required to spend time and monetary resources addressing any necessary
computer program changes.
 
INFLATION
 
    The Company'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.
 
ITEM 7A.  QUALITATIVE AND QUANTITATIVE DISCLOSURES ABOUT MARKET RISK
 
    Not applicable.
 
ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
 
    The financial statements and supplementary data required by Regulation S-X
are included in this Report on Form 10-K commencing on page F-1.
 
ITEM 9.  CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
       FINANCIAL DISCLOSURE
 
    Not applicable.
 
                                       22
<PAGE>
                                    PART IV
   ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K
 
    (a) (1 and 2) Financial Statements and Schedules
 
Prime Group Realty Trust and Predecessor Properties:
 
<TABLE>
<S>                                                                                 <C>
Report of Independent Auditors....................................................         F-1
Consolidated Balance Sheet of the Company as of December 31, 1997 and Combined
  Balance Sheet of the Predecessor Properties as of December 31, 1996.............         F-2
Consolidated Statement of Operations of the Company for the period from November
  17, 1997 to December 31, 1997 and Combined Statements of Operations of the
  Predecessor Properties for the period from January 1, 1997 to November 16, 1997
  and for the years ended December 31, 1996 and 1995..............................         F-3
Consolidated Statement of Changes in Shareholders' Equity for the period from
  November 17, 1997 to December 31, 1997..........................................         F-4
Combined Statement of Changes in Predecessors' Deficit for the period from January
  1, 1997 to November 16, 1997 and for the years ended December 31, 1996 and
  1995............................................................................         F-5
Consolidated Statements of Cash Flows of the Company for the period from November
  17, 1997 to December 31, 1997 and the Combined Statements of Cash Flows of the
  Predecessor Properties for the period from January 1, 1997 to November 16, 1997
  and for the years ended December 31, 1996 and 1995..............................         F-6
Notes to Consolidated and Combined Financial Statements...........................         F-9
</TABLE>
 
    All schedules are omitted since the required information is not present in
amounts sufficient to require submission of the schedule or because the
information required is included in the financial statements and notes thereto.
 
    (3) Exhibits
 
   
<TABLE>
<CAPTION>
EXHIBIT
 NO.   DESCRIPTION
- ------ --------------------------------------------------------------------------
<C>    <S>
  3.1* Articles of Amendment and Restatement of Declaration of Trust of Prime
       Group Realty Trust.
  3.2* Amended and Restated Bylaws of Prime Group Realty Trust.
  3.3* Amended and Restated Agreement of Limited Partnership of Prime Group
       Realty, L.P.
 10.1* Form of Indemnification Agreement between Prime Group Realty Trust and
       each of its trustees.
 10.2* Right of First Offer Agreement by and between Prime Group Realty, L.P. and
       The Prime Group, Inc..
 10.3* Share Incentive Plan.
 10.4* Employment Agreement by and between the Company and Michael W. Reschke.
 10.5* Employment Agreement by and between the Company and Richard S. Curto.
 10.6* Employment Agreement by and between the Company and W. Michael Karnes.
 10.7* Employment Agreement by and between the Company and Robert J. Rudnik.
 10.8* Employment Agreement by and between the Company and Jeffrey A. Patterson.
 10.9* Employment Agreement by and between the Company and Kevork M. Derderian.
 10.10* Employment Agreement by and between the Company and Edward S. Hadesman.
</TABLE>
    
 
                                       24
<PAGE>
   
<TABLE>
<CAPTION>
EXHIBIT
 NO.   DESCRIPTION
- ------ --------------------------------------------------------------------------
<C>    <S>
 10.11* Contribution Agreement dated as of October 20, 1997 by and among the Prime
       Group, Inc., Prime Group Realty, L.P., Prime Group Realty Trust, Narco
       River Business Center, Narco Tower Road Associates, Olympian Office
       Center, Tri-State Industrial Park Joint Venture, Carol Stream Industrial
       Park Joint Venture, Narco Enterprises, Inc., The Nardi Group Ltd., Narco
       Construction Inc., Nardi & Co., Nardi Asset Management, Inc. and Nardi
       Architectural, Inc. as filed as an exhibit to Registration Statement on
       Form S-11 (No. 333-33547) and incorporated herein by reference.
 10.12* Option to Purchase Partnership Interests dated as of June 17, 1994 by and
       between KILICO Realty Corporation, and The Prime Group, Inc., as amended
       by that certain First Amendment to Option to Purchase Partnership
       Interests dated as of January 21, 1997 by and between KILICO Realty
       Corporation and The Prime Group, Inc.; as further amended by that certain
       Second Amendment to Option to Purchase Partnership Interests dated as if
       July 15, 1997 by and between KILICO Realty Corporation and The Prime
       Group, Inc as filed as an exhibit to Registration Statement on Form S-11
       (No. 333-33547) and incorporated herein by reference.
 10.13* Option Agreement Regarding 300 N. LaSalle by and between Prime Group
       Realty, L.P. and 300 N. LaSalle, L.L.C.
 10.14* Registration Rights Agreement among Prime Group Realty Trust, Prime Group
       Realty, L.P., Prime Group Limited Partnership, Primestone Investment
       Partners L.P. and the other investors named herein.
 10.15* Contribution Agreement dated as of July 8, 1997 by and among LaSalle
       National Trust, N.A., not personally, but solely as Trustee under Trust
       Agreement dated June 15, 1982 and known as Trust No. 10-40113-09, LaSalle
       National Trust, N.A., not personally, but solely as Trustee under Trust
       Agreement dated September 7, 1994 and known as Trust No. 11-9051, LaSalle
       National Trust, N.A., not personally, but solely as Trustee under Trust
       Agreement dated March 30, 1984 and known as Trust No. 11-107825, LaSalle
       National Trust, N.A., not personally, but solely as Trustee under Trust
       Agreement dated August 1, 1986 and known as Trust No. 11-1358, LaSalle
       National Trust, N.A., not personally, but solely as Trustee under Trust
       Agreement dated August 1, 1986 and known as Trust No. 11-1357, LaSalle
       National Trust N.A., not personally, but solely as Trustee under Trust
       Agreement dated August 1, 1986 and known as Trust No. 11-1357, LaSalle
       National Trust N.A., not personally, but solely as Trustee under Trust
       Agreement dated January 17, 1974 and known as Trust No. 286-34, LaSalle
       National Trust, N.A., not personally, but solely as Trustee under Trust
       Agreement dated October 15, 1995 and known as Trust No. 11-9869, LaSalle
       National Trust, N.A., not personally, but solely as Trustee under Trust
       Agreement dated December 1, 1987 and known as Trust No. 11-2868, 310 ERA
       Limited Partnership, MacArthur Drive Properties, CLE Limited Partnership,
       500 Lindberg Limited Partnership, 515 Huehl Limited Partnership, 555 Huehl
       Limited Partnership, Sky Harbor Associates, 1001 Technology Way, LLC, The
       Grandville Road Limited Partnership, Industrial Building and Development
       Company and The Prime Group, Inc.; as amended by the First Amendment to
       the Contribution Agreement dated as of August 12, 1997, by and between The
       Prime Group, Inc., an Illinois corporation, and LaSalle National Trust,
       NA, t/u/t 10-40113-09 dated June 15, 1982; LaSalle National Trust, NA,
       t/u/t 11-9051 dated September 7, 1994; LaSalle National Trust, NA, t/u/t
       11-107825 dated March 30, 1984; LaSalle National Trust, NA, t/u/t 11-1358
       dated August 1, 1986; LaSalle National Trust, NA, t/u/t 11-1357 dated
       August 1, 1986; LaSalle National Trust, NA, t/u/t 286-34 dated January 17,
       1974; LaSalle National Trust, NA, t/u/t 11-9869 dated October 15, 1995;
       LaSalle National Trust, NA, t/u/t 11-2868 dated December 1, 1987 as filed
       as an exhibit to Registration Statement on Form S-11 (No. 333-33547) and
       incorporated herein by reference.
 10.16 [Deleted]
</TABLE>
    
 
   
                                       25
    
<PAGE>
   
<TABLE>
<CAPTION>
EXHIBIT
 NO.   DESCRIPTION
- ------ --------------------------------------------------------------------------
<C>    <S>
 10.17* Formation Agreement by and among Prime Group Realty Trust, Prime Group
       Realty, L.P., Prime Group Realty Services, Inc., The Prime Group, Inc.,
       Prime Group Limited Partnership and Jeffrey A. Patterson.
 10.18* Asset Purchase Agreement by and among Continental Offices, Ltd.,
       Continental Offices Ltd. Realty and Prime Group Realty, L.P. as filed as
       an exhibit to Registration Statement on Form S-11 (No. 333-33547) and
       incorporated herein by reference.
 10.19* Non-Compete Agreement by and among Prime Group Realty Trust, The Prime
       Group, Inc. and Michael W. Reschke.
 10.20* Option Agreement dated as of August 4, 1997 by and between Lumbermens
       Mutual Casualty Company and The Prime Group, Inc. as filed as an exhibit
       to Registration Statement on Form S-11 (No. 333-33547) and incorporated
       herein by reference.
 10.21* Amended and Restated Agreement dated as of July 15, 1997 by and among
       Kemper Investors Life Insurance Company, Federal Kemper Life Assurance
       Company, KILICO Realty Corporatio, FKLA Realty Corporation, KR 77 Fitness
       Center, Inc., 77 West Wacker Limited Partnership, K/77 Investors Limited
       Partnership, The Prime Group, Inc., Prime Group Limited Partnership and
       Prime 77 Fitness Center, Inc. as filed as an exhibit to Registration
       Statement on Form S-11 (No. 333-33547) and incorporated herein by
       reference.
 10.22* Agreement dated as of July 18, 1997 by and among The Prime Group, Inc.,
       KILICO Realty Corporation, KFC Portfolio Corp. and Kemper Investors Life
       Insurance Company as filed as an exhibit to Registration Statement on Form
       S-11 (No. 333-33547) and incorporated herein by reference.
 10.23* Series A Convertible Preferred Securities Agreement by and between
       Security Capital Preferred Growth Incorporated and Prime Group Realty
       Trust.
 10.24* Tax Indemnification Agreement by and between Prime Group Realty Trust and
       the IBD Contributors.
 10.25* Tax Indemnification Agreement by and between Prime Group Realty Trust and
       one of its general partners.
 10.26^ Credit Facility between Prime Group Realty Trust, BankBoston, N.A. and
       Prudential Securities Credit Corporation.
 10.27* Underwriting Agreement between Prime Group Realty Trust and Prudential
       Securities Incorporated, Friedman, Billings, Ramsey & Co., Inc., Smith
       Barney Inc. and Morgan Keegan & Company, Inc., as representatives of the
       other underwriters.
 10.28* Registration Rights Agreement between Prime Group Realty Trust and certain
       holders of Common Units of Prime Group Realty, L.P.
 10.29* Environmental Remediation and Indemnification Agreement between Prime
       Group Realty, L.P. and The Prime Group, Inc.
 10.30^ Registration Rights Agreement between Prime Group Realty Trust and
       Security Preferred Growth Incorporated.
 10.31^ Tag-Along Agreement among Prime Financing, L.P., Prime Group Limited
       Partnership, Prime Group II, L.P., Prime Group III, L.P., Prime Group IV,
       L.P., Prime Group V, L.P., The Prime Group, Inc., PG/Primestone, L.L.C.,
       and Security Capital Preferred Growth Incorporated.
 10.32^ Placement Fee Letter between Prime Group Realty Trust and Prime Group
       Realty, L.P. as Placement Agent and Security Capital Markets Group
       Incorporated.
 10.33^ Indemnification Agreement between Prime Group Realty, L.P. and The Prime
       Group, Inc.
 12.1* Statements re: computation of ratios.
</TABLE>
    
 
   
                                       26
    
<PAGE>
   
<TABLE>
<CAPTION>
EXHIBIT
 NO.   DESCRIPTION
- ------ --------------------------------------------------------------------------
<C>    <S>
 19.1* Form of Common Share Certificate.
 19.2* Form of Convertible Preferred Share certificate.
 22.1* List of subsidiaries.
 27.1* Financial Data Schedule.
</TABLE>
    
 
- ------------------------
 
   
 *  previously filed
    
 
   
^  filed herewith
    
 
   
(a) Reports on Form 8-K
    
 
    On December 30, 1997, the Company filed a report on Form 8-K relating to the
acquisition of certain real estate properties. On January 14, 1998, the Company
filed a report on Form 8-K relating to the acquisition of certain real estate
properties. The Company filed the required financial statements and information
under cover of Form 8-K/A on February 27, 1998.
 
                                       27
<PAGE>
                                   SIGNATURES
 
   
    Pursuant to the requirements of Section 13 or 15(d) 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 on April 24, 1998.
    
 
   
<TABLE>
<S>                             <C>
                                PRIME GROUP REALTY TRUST
 
Dated: April 24, 1998                      /s/ RICHARD S. CURTO
                                ------------------------------------------
                                             Richard S. Curto
                                           PRESIDENT AND CHIEF
                                            EXECUTIVE OFFICER
 
Dated: April 24, 1998                     /s/ WILLIAM M. KARNES
                                ------------------------------------------
                                            William M. Karnes
                                       EXECUTIVE VICE PRESIDENT AND
                                         CHIEF FINANCIAL OFFICER
</TABLE>
    
 
    Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed below by the following persons on behalf of the
registrant and in the capacities and on the dates indicated.
 
   
             NAME                          TITLE                    DATE
- ------------------------------  ---------------------------  -------------------
    /s/ MICHAEL W. RESCHKE      Chairman of the Board and
- ------------------------------    Trustee                      April 24, 1998
      Michael W. Reschke
 
     /s/ RICHARD S. CURTO       President, Chief Executive
- ------------------------------    Officer and Trustee          April 24, 1998
       Richard S. Curto
 
     /s/ KATHRYN A. DEANE       Vice President and
- ------------------------------    Controller                   April 24, 1998
       Kathryn A. Deane
 
     /s/ STEPHEN J. NARDI       Trustee
- ------------------------------                                 April 24, 1998
       Stephen J. Nardi
 
    /s/ JAMES R. THOMPSON       Trustee
- ------------------------------                                 April 24, 1998
      James R. Thompson
 
    /s/ JACQUE M. DUCHARME      Trustee
- ------------------------------                                 April 24, 1998
      Jacque M. Ducharme
 
 /s/ CHRISTOPHER J. NASSETTA    Trustee
- ------------------------------                                 April 24, 1998
   Christopher J. Nassetta
 
     /s/ THOMAS J. SAYLAK       Trustee
- ------------------------------                                 April 24, 1998
       Thomas J. Saylak
 
    
 
                                       28
<PAGE>
                         REPORT OF INDEPENDENT AUDITORS
 
Board of Trustees
Prime Group Realty Trust
 
    We have audited the accompanying consolidated balance sheet of Prime Group
Realty Trust (the Company) as of December 31, 1997, and the related consolidated
statements of operations, shareholders' equity and cash flows for the period
from November 17, 1997 (date of formation) through December 31, 1997. We have
also audited the accompanying combined balance sheet of Predecessor Properties
(the Predecessor to the Company) as of December 31, 1996, and the related
combined statements of operations, changes in predecessors' deficit, and cash
flows for the period from January 1, 1997 through November 16, 1997, and for
each of the two years in the period ended December 31, 1996. These financial
statements are the responsibility of the Company's and Predecessor's management.
Our responsibility is to express an opinion on these financial statements based
on our audits.
 
    We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
    In our opinion, the financial statements referred to above present fairly,
in all material respects, the consolidated financial position of Prime Group
Realty Trust at December 31, 1997, and the consolidated results of its
operations and its cash flows for the period from November 17, 1997 through
December 31, 1997, and the combined financial position of Predecessor Properties
at December 31, 1996 and the combined results of its operations and its cash
flows for the period from January 1, 1997 through November 16, 1997, and for
each of the two years in the period ended December 31, 1996, in conformity with
generally accepted accounting principles.
 
                                          /s/ ERNST & YOUNG LLP
 
Chicago, Illinois
March 27, 1998
 
                                      F-1
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
                 CONSOLIDATED BALANCE SHEET OF THE COMPANY AND
                   COMBINED BALANCE SHEET OF THE PREDECESSOR
 
                (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                                       PRIME GROUP    PREDECESSOR
                                                                                       REALTY TRUST    PROPERTIES
                                                                                            AT             AT
                                                                                       DECEMBER 31    DECEMBER 31
                                                                                           1997           1996
                                                                                      --------------  ------------
<S>                                                                                   <C>             <C>
ASSETS
Real estate at cost:
  Land..............................................................................   $     92,440    $   23,530
  Building and improvements.........................................................        496,839       268,227
                                                                                      --------------  ------------
                                                                                            589,279       291,757
Accumulated depreciation............................................................         (2,338)      (44,411)
                                                                                      --------------  ------------
                                                                                            586,941       247,346
Mortgage note receivable............................................................         56,263            --
Cash and cash equivalents...........................................................         11,969         5,573
Tenant receivables..................................................................         41,648        41,384
Deferred costs -- Net...............................................................         28,472        26,883
Due from affiliates.................................................................          5,258         2,894
Other...............................................................................         10,917         1,150
                                                                                      --------------  ------------
Total assets........................................................................   $    741,468    $  325,230
                                                                                      --------------  ------------
                                                                                      --------------  ------------
LIABILITIES AND SHAREHOLDERS' EQUITY
Mortgage notes payable..............................................................   $    249,610    $  235,886
Mortgage notes payable -- Affiliates................................................          3,984        99,647
Bonds payable.......................................................................         74,450        74,450
Bonds payable -- Affiliates.........................................................             --        12,000
Accrued interest payable............................................................          1,245         2,538
Accrued real estate taxes...........................................................         17,915         9,944
Accounts payable and accrued expenses...............................................         13,903         4,213
Liabilities for leases assumed......................................................          5,758         7,157
Dividends declared..................................................................          2,505            --
Due to affiliates...................................................................             --           708
Other...............................................................................            822         1,384
                                                                                      --------------  ------------
Total liabilities...................................................................        370,192       447,927
Minority interest...................................................................        147,207        (6,905)
Predecessors' net deficit...........................................................             --      (115,792)
Shareholders' equity:
  Preferred shares, $.01 par value; 30,000,000 shares
    authorized, 2,000,000 cumulative convertible preferred shares
    issued and outstanding..........................................................             20            --
  Common Shares, $.01 par value; 100,000,000 shares
    authorized, 12,980,000 shares issued and outstanding............................            130            --
  Additional paid-in capital........................................................        225,632            --
  Distributions in excess of earnings...............................................         (1,713)           --
                                                                                      --------------  ------------
Total shareholders' equity..........................................................        224,069            --
                                                                                      --------------  ------------
Total liabilities and shareholders' equity..........................................   $    741,468    $  325,230
                                                                                      --------------  ------------
                                                                                      --------------  ------------
</TABLE>
 
                            See accompanying notes.
 
                                      F-2
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
            CONSOLIDATED STATEMENT OF OPERATIONS OF THE COMPANY AND
              COMBINED STATEMENTS OF OPERATIONS OF THE PREDECESSOR
 
                (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                    PRIME GROUP
                                                  REALTY TRUST --       PREDECESSOR
                                                    PERIOD FROM        PROPERTIES --      PREDECESSOR PROPERTIES
                                                 NOVEMBER 17, 1997      PERIOD FROM       YEAR ENDED DECEMBER 31
                                                  TO DECEMBER 31,     JANUARY 1, 1997     ----------------------
                                                       1997         TO NOVEMBER 16, 1997     1996        1995
                                                 -----------------  --------------------  ----------  ----------
<S>                                              <C>                <C>                   <C>         <C>
REVENUE
Rental.........................................      $   7,293           $   27,947       $   30,538  $   33,251
Tenant reimbursements..........................          2,041               12,490           14,225      14,382
Parking........................................             60                  264              320         345
Mortgage note interest.........................            248                   --               --          --
Gain on sale of assets.........................             --                  286              846         771
Insurance settlement...........................             --                   --               --       7,257
Other..........................................            188                  965            2,231       1,599
                                                        ------              -------       ----------  ----------
Total revenue..................................          9,830               41,952           48,160      57,605
EXPENSES
Property operations............................          2,213                8,622            9,767       9,479
Real estate taxes..............................          1,765                8,575            9,383       9,445
Depreciation and amortization..................          2,478               11,241           12,409      12,646
Interest.......................................          1,680               24,613           26,422      27,671
Interest -- Affiliates.........................             --                9,804           10,795       8,563
Financing fees.................................             --                1,180            1,232          --
Property and asset management fees --
  Affiliates...................................             --                1,348            1,561       1,496
General and administrative.....................            267                2,414            4,927       4,508
Provision for environmental remediation
  costs........................................             --                3,205               --          --
Write-off deferred tenant costs................             --                   --            3,081      13,373
                                                        ------              -------       ----------  ----------
Total expenses.................................          8,403               71,002           79,577      87,181
                                                        ------              -------       ----------  ----------
Income (loss) before minority interest and
  extraordinary item...........................          1,427              (29,050)         (31,417)    (29,576)
Minority interest..............................           (635)                 666              894       3,281
                                                        ------              -------       ----------  ----------
Income (loss) before extraordinary gain........            792              (28,384)         (30,523)    (26,295)
Extraordinary item; gain on extinguishment of
  debt, net of minority interest in the amount
  of $1,127....................................             --               65,990               --          --
                                                        ------              -------       ----------  ----------
Net income (loss)..............................            792           $   37,606       $  (30,523) $  (26,295)
                                                                            -------       ----------  ----------
                                                                            -------       ----------  ----------
Net income allocated to preferred
  shareholders.................................            345
                                                        ------
Net income available to common shareholders....      $     447
                                                        ------
                                                        ------
Net income available per weighted-average
  common share of beneficial interest -- Basic
  and diluted..................................      $    0.04
                                                        ------
                                                        ------
</TABLE>
 
                            See accompanying notes.
 
                                      F-3
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
           CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY
               PERIOD FROM NOVEMBER 17, 1997 TO DECEMBER 31, 1997
 
                (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                                 ADDITIONAL  DISTRIBUTIONS
                                                        PREFERRED     COMMON      PAID-IN    IN EXCESS OF
                                                          STOCK        STOCK      CAPITAL      EARNINGS      TOTAL
                                                       -----------  -----------  ----------  ------------  ----------
<S>                                                    <C>          <C>          <C>         <C>           <C>
Issuance of 2,000,000 shares
  of preferred stock.................................   $      20    $      --   $   39,580   $       --   $   39,600
Issuance of 12,980,000 shares
  of common stock....................................          --          130      232,222           --      232,352
Step-up in basis from the purchase of third-party
  owner's interest in predecessor--..................          --           --        1,430           --        1,430
Reclassification of predecessor's minority
  interest...........................................          --           --       (6,564)          --       (6,564)
Reclassification of net deficit of predecessor.......          --           --      (33,976)          --      (33,976)
Additional contribution by predecessor...............          --           --       11,873           --       11,873
Contribution of net liabilities to service company...          --           --          380           --          380
Additional paid-in capital allocated to minority
  interest...........................................          --           --      (19,313)          --      (19,313)
Net income...........................................          --           --           --          792          792
Preferred dividends declared
  ($0.173 per share).................................          --           --           --         (345)        (345)
Common dividends declared
  ($0.166 per share).................................          --           --           --       (2,160)      (2,160)
                                                       -----------       -----   ----------  ------------  ----------
Balance at December 31, 1997.........................   $      20    $     130   $  225,632   $   (1,713)  $  224,069
                                                       -----------       -----   ----------  ------------  ----------
                                                       -----------       -----   ----------  ------------  ----------
</TABLE>
 
                            See accompanying notes.
 
                                      F-4
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
            COMBINED STATEMENTS OF CHANGES IN PREDECESSORS' DEFICIT
 
                PERIOD FROM JANUARY 1, 1997 TO NOVEMBER 16, 1997
               AND FOR THE YEARS ENDED DECEMBER 31, 1996 AND 1995
                (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AMOUNTS)
 
<TABLE>
<S>                                                                                 <C>
Balance at January 1, 1995........................................................  $ (65,722)
Contributions.....................................................................        732
Distributions.....................................................................       (179)
Assignment of minority interest...................................................      3,243
Forgiveness of notes payable to minority interest.................................      2,916
Net loss..........................................................................    (26,295)
                                                                                    ---------
Balance at December 31, 1995......................................................    (85,305)
Contributions.....................................................................         40
Distributions.....................................................................         (4)
Net loss..........................................................................    (30,523)
                                                                                    ---------
Balance at December 31, 1996......................................................   (115,792)
Contributions.....................................................................     44,330
Distributions.....................................................................       (120)
Net income........................................................................     37,606
                                                                                    ---------
Balance at November 16, 1997......................................................  $ (33,976)
                                                                                    ---------
                                                                                    ---------
</TABLE>
 
                            See accompanying notes.
 
                                      F-5
<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 STATEMENTS OF CASH FLOWS OF THE PREDECESSOR
 
                (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AMOUNTS)
 
   
<TABLE>
<CAPTION>
                                                                            PREDECESSOR
                                                           PRIME GROUP       PROPERTIES
                                                           REALTY TRUST         FROM
                                                               FROM          JANUARY 1,    PREDECESSOR PROPERTIES
                                                           NOVEMBER 17,         1997       YEAR ENDED DECEMBER 31
                                                               1997         TO NOVEMBER
                                                         TO DECEMBER 31,        16,        ----------------------
                                                               1997             1997          1996        1995
                                                         ----------------  --------------  ----------  ----------
<S>                                                      <C>               <C>             <C>         <C>
OPERATING ACTIVITIES
Net income (loss)......................................    $        792      $   37,606    $  (30,523) $  (26,295)
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)......................................             142           1,022         1,244       1,539
  Decrease (increase) in tenant receivables from
  straight-lining rent.................................             180             487          (645)     (8,779)
  Gain on sale of real estate..........................              --            (286)         (846)       (771)
  Depreciation and amortization........................           2,478          11,241        12,409      12,646
  Interest added to principal on mortgage note payable
  affiliate............................................              --           9,772        10,002       8,427
  Standby loan fee-affiliate added to principal on
  mortgage note payable affiliate......................              --             460           522         498
  Write-off of deferred tenant costs...................              --              --         3,081      13,373
  Minority interest....................................             635            (666)         (894)     (3,281)
  Extraordinary item...................................              --         (65,990)           --          --
  Changes in operating assets and liabilities:
    Decrease (increase) in tenant receivables..........             (15)           (916)        1,990       2,326
    Increase in deferred costs.........................             (48)         (1,459)         (703)       (907)
    (Increase) decrease in other assets................         (10,032)            506           566       2,937
    (Decrease) increase in accrued interest payable....            (175)         (1,118)          316      (1,221)
    Increase in accrued real estate taxes..............           7,556             415           251           5
    Increase (decrease) increase in accounts payable
      and accrued expenses.............................           7,202           3,498         1,380         (34)
    Decrease in liabilities for assumed leases.........            (350)         (1,049)       (1,532)     (1,985)
    Increase (decrease) in other liabilities...........          (1,707)            777           217         263
                                                         ----------------  --------------  ----------  ----------
Net cash provided by (used in) operating activities....           6,658          (5,700)       (3,165)     (1,259)
</TABLE>
    
 
                                      F-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 STATEMENTS OF CASH FLOWS OF THE PREDECESSOR (CONTINUED)
 
                (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                                            PREDECESSOR
                                                           PRIME GROUP       PROPERTIES
                                                           REALTY TRUST         FROM
                                                               FROM          JANUARY 1,    PREDECESSOR PROPERTIES
                                                           NOVEMBER 17,         1997       YEAR ENDED DECEMBER 31
                                                               1997         TO NOVEMBER
                                                         TO DECEMBER 31,        16,        ----------------------
                                                               1997             1997          1996        1995
                                                         ----------------  --------------  ----------  ----------
<S>                                                      <C>               <C>             <C>         <C>
INVESTING ACTIVITIES
Proceeds from sale of real estate......................    $         --      $      298    $    2,110  $      921
Expenditures for real estate...........................        (297,019)         (5,659)       (3,842)     (4,842)
Purchase of mortgage note receivable...................         (51,163)             --            --          --
Cash contributed to service company....................            (376)             --            --          --
Decrease (increase) in due from affiliates.............          (5,258)          2,894         2,858      (5,255)
                                                         ----------------  --------------  ----------  ----------
Net cash (used in) provided by investing activities....        (353,816)         (2,467)        1,126      (9,176)
FINANCING ACTIVITIES
Proceeds from the sale of preferred shares.............          39,600              --            --          --
Proceeds from the sale of common shares................         232,352              --            --          --
Proceeds from sale of operating partnership units......          85,000              --            --          --
Additions to deferred financing costs..................          (3,328)             --           (10)       (225)
Proceeds from mortgage notes payable...................         243,198             480         1,239       9,815
Proceeds from mortgage notes payable -- Affiliates.....              --           5,647         5,891       2,693
Repayment of mortgage notes payable....................        (236,537)           (119)          (83)       (384)
Repayment of mortgage notes payable -- Affiliates......          (4,895)        (41,367)       (1,150)     (1,079)
Increase (decrease) in due to affiliates...............              --            (708)         (226)       (347)
Contributions from partners............................              --          44,330            80         872
Distributions to partners..............................              --            (120)           (8)       (357)
Distributions to minority interest.....................              --            (120)           --          --
Debt termination fees..................................              --          (1,692)           --          --
Acquisition of partnership interest....................              --              --            --        (115)
                                                         ----------------  --------------  ----------  ----------
Net cash provided by financing activities..............         355,390           6,331         5,733      10,873
                                                         ----------------  --------------  ----------  ----------
Net increase (decrease) in cash and cash equivalents...           8,232          (1,836)        3,694         438
Cash and cash equivalents at beginning of period.......           3,737           5,573         1,879       1,441
                                                         ----------------  --------------  ----------  ----------
Cash and cash equivalents at end of period.............    $     11,969      $    3,737    $    5,573  $    1,879
                                                         ----------------  --------------  ----------  ----------
                                                         ----------------  --------------  ----------  ----------
</TABLE>
 
                                      F-7
<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 STATEMENTS OF CASH FLOWS OF THE PREDECESSOR (CONTINUED)
 
                (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AMOUNTS)
 
<TABLE>
<S>                                                                                 <C>
Supplemental disclosure of non-cash investing and financing activities:
 
The following assets and liabilities (Represents the Predecessor Properties,
  $12,000 of bonds receivable, $241 of other assets and $368 of other liabilities
  contributed by the Predecessor. The bonds receivable have been netted against
  the corresponding bonds payable of the Predecessor Properties.) were contributed
  by certain minority interest partners to the Company on November 17, 1997:
Real estate, net..................................................................  $ 243,637
Cash and cash equivalents.........................................................      3,737
Tenant receivable.................................................................     41,813
Deferred costs, net...............................................................     25,270
Other assets......................................................................        885
                                                                                    ---------
Total assets......................................................................    315,342
 
Mortgage notes payable............................................................    241,432
Bonds payable.....................................................................     74,450
Accrued interest payable..........................................................      1,420
Accrued real estate taxes.........................................................     10,359
Accounts payable and accrued expenses.............................................      7,711
Liabilities for leases assumed....................................................      6,108
Other liabilities.................................................................      2,529
Minority interests................................................................     (6,564)
                                                                                    ---------
Total liabilities and minority interests..........................................    337,445
                                                                                    ---------
Predecessor owners' net contribution..............................................  $ (22,103)
                                                                                    ---------
                                                                                    ---------
</TABLE>
 
    The following represents non-cash activity for the Company during the period
from November 17, 1997 to December 31, 1997:
 
<TABLE>
<S>                                                                                  <C>
Mortgage note receivable...........................................................  $   5,100
Real estate........................................................................     48,814
                                                                                     ---------
                                                                                     $  53,914
                                                                                     ---------
                                                                                     ---------
Debt assumed.......................................................................  $  10,396
Partnership units issued to minority interest......................................     42,088
Step-up in basis from purchase of third-party owner's interest in predecessor......      1,430
                                                                                     ---------
                                                                                     $  53,914
                                                                                     ---------
                                                                                     ---------
</TABLE>
 
                            See accompanying notes.
 
                                      F-8
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
            NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
1. FORMATION AND ORGANIZATION OF THE COMPANY
 
   
    Prime Group Realty Trust (together with its consolidated subsidiaries and
unconsolidated investment subsidiary, the "Company") was organized in Maryland
on July 21, 1997. The Company was formed to continue the business of The Prime
Group, Inc. and certain of its affiliates (collectively "PGI"). The Company will
make an election to qualify as a real estate investment trust ("REIT") for the
period ended December 31, 1997, under the Internal Revenue Code of 1986, as
amended, for Federal income tax purposes. On November 17, 1997, the Company
completed an initial public offering (the "Offering") of 12,380,000 Common
Shares of Beneficial Interest ("Common Shares") at $20.00 per share and the
private placement (the "Private Placement") of 2,000,000 Cumulative Convertible
Preferred Shares of Beneficial Interest ("Preferred Shares") at $20.00 per
share. Net of underwriting discounts and expenses, the Company received
approximately $260,792 in net proceeds from the Offering and Private Placement.
On December 12, 1997, the underwriters of the Offering exercised their
overallotment option to purchase 600,000 Common Shares at $20.00 per share
("Overallotment"). The Company received net proceeds of approximately $11,160 on
December 15, 1997, with respect to the Overallotment.
    
 
   
    Upon consummation of the Offering and Private Placement, the Company
contributed the initial net proceeds from the Offering and Private Placement in
exchange for 12,380,000 common units of partnership interest ("Common Units")
and 2,000,000 preferred units of partnership interest ("Preferred Units") in
Prime Group Realty, L.P. (the "Operating Partnership"). The Operating
Partnership also sold 4,569,893 Common Units for $85,000 to Primestone Joint
Venture ("Primestone"--PGI obtained a 60% ownership interest in Primestone in
exchange for the contribution of 3,375,000 of its Common Units received from the
contribution of its interest in the Prime Properties to the Operating
Partnership described below. Primestone has a 34.2% limited partner ownership
interest in the Operating Partnership at December 31, 1997). The Operating
Partnership used such proceeds primarily to repay certain mortgages and other
indebtedness, acquire interests in certain of the properties ("Prime
Properties") owned or controlled by PGI (the "Predecessor") and other
contributors (defined below) and purchase various office and industrial
properties from unaffiliated third parties. The Company contributed the net
proceeds from the Overallotment to the Operating Partnership in exchange for
600,000 Common Units. The Operating Partnership, in turn, used such proceeds
primarily for property acquisitions.
    
 
   
    The Company is the managing general partner of the Operating Partnership and
owns all of the Preferred Units and 55.9% of the Common Units issued at December
31, 1997. Each Common Unit entitles the Company to receive distributions from
the Operating Partnership. Distributions declared or paid to holders of Common
Stock are based upon such distributions received by the Company with respect to
its Common Units.
    
 
   
    Upon consummation of the Offering, PGI contributed its interest in the Prime
Properties to the Operating Partnership in exchange for 3,465,000 Common Units
(after the contribution of 3,375,000 Common Units to Primestone, PGI has a 0.5%
direct limited partner interest in the Operating Partnership at December 31,
1997), and received approximately $6,487 for the reimbursement of formation
costs advanced by PGI. A senior executive of the Company contributed his
interest in the Prime Properties to the Operating Partnership in exchange for
110,000 Common Units (a 0.5% limited partner interest of the Operating
Partnership at December 31, 1997). In addition, the Operating Partnership was
required to acquire a third-party ownership interest in certain of the Prime
Properties for $1,797, resulting in a step-up in the basis of real estate of
$3,227. Certain individuals (collectively, the "Contributors") contributed their
    
 
                                      F-9
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
1. FORMATION AND ORGANIZATION OF THE COMPANY (CONTINUED)
   
ownership interests in various properties, including the related debt, to the
Operating Partnership in exchange for cash of approximately $15,761 and
1,849,417 Common Units (a 3.9% general partner interest of the Operating
Partnership and a 3.9% limited partner interest of the Operating Partnership at
December 31, 1997), valued at $20.00 per unit (total value of $36,988). These
properties, along with other acquired properties are controlled by the Operating
Partnership (the "New Entities") and are described below. PGI, the senior
executive and the Contributors have been reflected as minority interest in the
consolidated financial statements of the Company.
    
 
    On November 17, 1997, the Operating Partnership acquired the assets and
business of Continental Offices, Ltd. and Continental Offices, Ltd. Realty
("Continental Office Management") and contributed these entities and certain
other assets to a newly formed corporation, Prime Group Realty Services, Inc.
(the "Service Company"). In exchange for its contribution, the Company received
100% of the non-voting preferred stock of the Service Company and a note
receivable in the amount of $4,800 (see Note 11). Certain members of management
of the Company own 100% of the voting common stock. The Service Company was
formed primarily to operate business lines of the Company that are not directly
associated with the collection of rents. The Service Company is subject to
federal, state and local taxes.
 
    Unless the context requires otherwise, all references to the Company herein
mean Prime Group Realty Trust and those entities owned or controlled by Prime
Group Realty Trust, including the Operating Partnership.
 
    The Prime Properties represent a combination of 23 partnerships described
below (PGI Partnerships) that own, operate, and manage office and industrial
properties in the greater Chicagoland area and Tennessee. The Prime Properties
were under common management and ownership of PGI as either the managing general
partner (responsible for the operations of the Prime Properties) or 100% owner.
Prior to the contribution of the Properties, six of the Partnerships had third
party owners (Third Party), whose ownership interests have been reflected as a
minority interest in the combined financial statements of the Predecessor.
 
   
    The Prime Properties consisted of the following at November 16, 1997:
    
 
<TABLE>
<CAPTION>
                 PARTNERSHIP                                       PROPERTY
- ----------------------------------------------  ----------------------------------------------
<S>                                             <C>
 
77 West Wacker Limited Partnership (77 West     77 West Wacker Building
  Wacker)
 
Nashville Office Building I, Ltd.               Nashville Office Building
 
Professional Plaza, Ltd.                        Professional Plaza
 
Old Kingston Properties, Ltd.                   Old Kingston
 
Two Centre Square, Ltd.                         Two Centre Square
 
Hammond Enterprise Center Limited Partnership   Hammond Enterprise Center
  (HEC)
</TABLE>
 
                                      F-10
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
1. FORMATION AND ORGANIZATION OF THE COMPANY (CONTINUED)
 
   
<TABLE>
<CAPTION>
                 PARTNERSHIP                                       PROPERTY
- ----------------------------------------------  ----------------------------------------------
<S>                                             <C>
East Chicago Enterprise Center Limited          East Chicago Enterprise Center
  Partnership (ECEC)
 
Kemper/Prime Industrial Partners (KP)           Chicago Enterprise Center
 
Enterprise Center I, L.P. (ECI)                 Enterprise Center I
 
Enterprise Center II, L.P.                      Enterprise Center II
 
Enterprise Center III, L.P.                     Enterprise Center III
 
Enterprise Center IV, L.P.                      Enterprise Center IV
 
Enterprise Center V, L.P.                       Enterprise Center V
 
Enterprise Center VI, L.P.                      Enterprise Center VI
 
Enterprise Center VII, L.P.                     Enterprise Center VII
 
Enterprise Center VIII, L.P.                    Enterprise Center VIII
 
Enterprise Center IX, L.P.                      Enterprise Center IX
 
Enterprise Center X, L.P.                       Enterprise Center X
 
Arlington Heights I, L.P.                       Arlington Heights I
 
Arlington Heights II, L.P.                      Arlington Heights II
 
Arlington Heights III, L.P.                     Arlington Heights III
 
Triad Parking Company, Ltd.                     Triad Parking Facility
 
77 Fitness Center, Ltd. (1)                     Executive Sports and Fitness Center
</TABLE>
    
 
- ------------------------
 
(1) The Operating Partnership contributed this entity to the Service Company on
    November 17, 1997, including net equipment of $83, cash of $376 and accounts
    payable of $839.
 
                                      F-11
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
1. FORMATION AND ORGANIZATION OF THE COMPANY (CONTINUED)
    The entity name and related property of the New Entities (the properties
were either contributed or acquired at the Offering date, unless otherwise
noted) operated by the Operating Partnership at December 31, 1997 are as
follows:
 
<TABLE>
<CAPTION>
                    ENTITY                                         PROPERTY
- ----------------------------------------------  ----------------------------------------------
<S>                                             <C>
 
1990 Algonquin Road, L.L.C.                     1990 Algonquin Road
 
2010 Algonquin Road, L.L.C.                     2010 Algonquin Road
 
555 Huehl Road, L.L.C.                          555 Huehl Road
 
1669 Woodfield Road, L.L.C.                     1669 Woodfield Road
 
475 Superior Avenue, L.L.C.                     475 Superior Avenue
 
Enterprise Drive, L.L.C.                        2205-2255 Enterprise Drive
 
280 Shuman Blvd., L.L.C.                        280 Shuman Blvd.
 
Continental Towers, L.P. (1)                    Continental Towers
 
2675 N. Mayfair Road, L.L.C. (2)                2675 N. Mayfair Road
 
Prime Columbus Industrial, L.L.C.               2160 McGaw Road, 4849 Groveport Road, 2400
                                                McGaw Road, 5160 Blazer Memorial Parkway, 600
                                                London Road and 4411 Marketing Place
 
Libertyville Tech Way, L.L.C.                   1001 Technology Way
 
801 Technology Way, L.L.C.                      801 Technology Way
 
3818 Grandville, L.L.C.                         3818 Grandville/1200 Northwestern
 
306 Era Drive, L.L.C.                           306-310 Era Drive
 
1301 Ridgeview Drive, L.L.C.                    1301 Ridgeview Drive
 
515 Huehl Road, L.L.C.                          515 Huehl Road/500 Lindberg
 
455 Academy Drive, L.L.C.                       455 Academy Drive
 
1051 N. Kirk Road, L.L.C.                       1051 N. Kirk Road
 
4211 Madison Street, L.L.C.                     4211 Madison Street
 
200 E. Fullerton, L.L.C.                        200 E. Fullerton
 
350 Randy Road, L.L.C.                          350 Randy Road
 
4300 Madison Street, L.L.C.                     4300, 4248, 4250 Madison Street
</TABLE>
 
                                      F-12
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
1. FORMATION AND ORGANIZATION OF THE COMPANY (CONTINUED)
 
<TABLE>
<CAPTION>
                    ENTITY                                         PROPERTY
- ----------------------------------------------  ----------------------------------------------
<S>                                             <C>
370 Carol Lane, L.L.C.                          370 Carol Lane
 
388 Carol Lane, L.L.C.                          388 Carol Lane
 
941 Weigel Drive, L.L.C.                        941-961 Weigel Drive
 
342 Carol Lane, L.L.C.                          342-346 Carol Lane
 
343 Carol Lane, L.L.C.                          343 Carol Lane
 
371 N. Gary Avenue, L.L.C.                      371-385 N. Gary Avenue
 
350 N. Mannheim Road, L.L.C.                    350 N. Mannheim Road
 
1600 167th Street, L.L.C.                       1600-1700 167th Street
 
1301 E. Tower Road, L.L.C.                      1301 E. Tower Road
 
4343 Commerce Court, L.L.C.                     4343 Commerce Court
 
11039 Gage Avenue, L.L.C.                       11039 Gage Avenue
 
11045 Gage Avenue, L.L.C.                       11045 Gage Avenue
 
1401 S. Jefferson, L.L.C.                       1401 S. Jefferson
 
4100 Madison Street, L.L.C.                     4100 Madison Street
 
4160 Madison Street, L.L.C.                     4160-4190 Madison Street
 
550 Kehoe Blvd., L.L.C.                         550 Kehoe Blvd.
</TABLE>
 
- ------------------------
 
(1) On December 15, 1997, the Company acquired the first mortgage note
    encumbering the property for $108,870. The note has a face value of $157,161
    at December 31, 1997, has a base interest rate of 6.5% per annum payable
    monthly, contingent interest rate of 6.5% per annum, payable from available
    cash flow as defined. All unpaid interest is added to principal. The note
    matures January 2013. The Company will receive all of the economic benefits
    from its interest in the property and therefore, the Company has
    consolidated the operations of the property from the acquisition date.
 
(2) The Company acquired the property on December 30, 1997 for $8,000.
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
BASIS OF PRESENTATION
 
    The consolidated financial statements of the Company include the accounts of
the Company, the Operating Partnership and the partnerships in which the Company
has majority interest or control. The combined financial statements of the
Predecessor include the accounts of the PGI Partnerships. The
 
                                      F-13
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
preparation of 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 revenues and expenses during the reporting period.
Actual results could differ from those estimates.
 
    Investments in corporations and partnerships in which the Company does not
have operational control or a majority interest are accounted for on the equity
method of accounting.
 
    Significant intercompany accounts and transactions have been eliminated in
consolidation and combination.
 
REAL ESTATE
 
    Depreciation is calculated on the straight-line method over the estimated
useful lives of assets, which are as follows:
 
<TABLE>
<S>                                    <C>
Building and improvements              40-50 years
 
Tenant improvement                     Term of related leases
</TABLE>
 
    Development costs, which include fees and costs incurred in developing new
properties, are capitalized as incurred. Upon completion of construction,
development costs are amortized over the useful lives of the respective
properties on a straight-line basis. Interest and other direct costs incurred
during construction periods are capitalized as a component of the building
costs.
 
    Real estate is carried at depreciated cost. Expenditures for ordinary
maintenance and repairs are expensed to operations as incurred. Significant
renovations and improvements which improve and/or extend the useful life of the
asset are capitalized and depreciated over their estimated useful life.
 
CASH EQUIVALENTS
 
    The Company considers highly liquid investments with a maturity of three
months or less when purchased to be cash equivalents.
 
DEFERRED COSTS
 
    Deferred financing costs are amortized on the straight-line method over the
terms of the loans. Deferred leasing costs are amortized on the straight-line
method over the terms of the related lease agreements.
 
LEASES ASSUMED
 
    In connection with obtaining certain tenant leases 77 West Wacker assumed
liability for the remaining terms of the tenants' existing leases. 77 West
Wacker has recorded a liability for the difference between total remaining costs
for leases assumed and the expected benefits from subleases of the assumed lease
properties. The related incentive to lessee has been capitalized as a deferred
charge and is being amortized
 
                                      F-14
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
   
to rental revenue over the life of the respective lease. The deferred charge and
related liability are adjusted for changes in the expected benefits from
subleases. During the period from January 1, 1997 to November 16, 1997 and for
the year ended December 31, 1996, 77 West Wacker wrote off $1,049 and $3,893,
respectively, of deferred charges and reduced the related liability due to
changes in the estimated benefits from subleases.
    
 
RENTAL REVENUE
 
   
    Rental revenue is recorded on the straight-line method over the terms of the
related lease agreements. As a result, $180 and $487 of cash was received in
excess of recorded rental revenue during the period from November 17, 1997 to
December 31, 1997 and the period from January 1, 1997 to November 16, 1997,
respectively, and $645 and $8,779 of noncash rent was recorded as rental revenue
during the years ended December 31, 1996 and 1995, respectively, and included in
accounts receivable. As of December 31, 1997 and 1996, the balance of the
accounts receivable relating to the straight-lining of rental revenue is $37,784
and $38,451, respectively.
    
 
INTEREST RATE SWAP AGREEMENT
 
   
    77 West Wacker has entered into an interest rate swap agreement to
effectively convert its variable-rate borrowing into a fixed-rate obligation.
(The agreement was terminated November 16, 1997 -- see Note 5).
    
 
EARNINGS PER SHARE
 
    On December 31, 1997, the Company adopted Statement of Financial Accounting
Standards ("SFAS") No. 128, "Earnings per Share" which specifies the method of
computation, presentation, and disclosure for earnings per share ("EPS"). SFAS
No. 128 requires the presentation of basic EPS and diluted EPS. Basic EPS is
calculated by dividing net income available to common shareholders by the
weighted average number of shares outstanding during the period. Diluted EPS
includes the potentially dilutive effect, if any, which would occur if
outstanding (i) Common Stock options were exercised, (ii) Common Units were
converted into shares of Common Stock, and (iii) Preferred Shares were converted
into shares of Common Stock.
 
STOCK BASED COMPENSATION
 
    The Company accounts for stock option grants in accordance with Accounting
Principles Board Opinion No. 25, "Accounting for Stock Issued to Employees"
("APB 25"). Under APB 25, no compensation expense is recognized for the stock
option grants because the exercise price of the options equals the market price
of the underlying stock at the date of grant.
 
INCOME TAXES
 
   
    Commencing with the period ended December 31, 1997, it is the intent of the
Company to qualify as a real estate investment trust (REIT) under the Internal
Revenue Code of 1986, as amended. As a REIT, the Company generally will not be
subject to federal income tax to the extent that is distributes at least 95% of
    
 
                                      F-15
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
its REIT taxable income to its shareholders. REITs are subject to a number of
organizational and operational requirements. If the Company fails to qualify as
a REIT in any taxable year, the Company will be subject to federal income tax
(including any applicable alternative minimum tax) on its taxable income at
regular corporate tax rates.
 
   
    As of December 31, 1997, for income tax purposes, tenant receivables have a
basis of $3,744, real estate has a gross and net basis of $672,618 and $647,565,
respectively, and deferred costs have a gross and net basis of $43,835 and
$28,472, respectively.
    
 
   
    The Partnerships pay no income taxes, and the income or loss from the
Partnerships is included on the respective income tax returns of the Partners.
    
 
3. MORTGAGE NOTE RECEIVABLE
 
   
    On December 16, 1997, the Company acquired the first mortgage note
encumbering the office property known as 180 North LaSalle Street, which is a
39-story office building, located in Chicago, Illinois, that contains 729,000
square feet of rentable space, including 15,000 square feet of retail space and
is approximately 81% leased at December 31, 1997. The first mortgage note, which
has a face value of $63,329 at December 31, 1997 and an interest rate of 8.25%,
was purchased for approximately $51,163 in cash and $5,100 in Common Units
(256,572 Common Units, a 1.1% limited partner interest in the Operating
Partnership at December 31, 1997). Included in the purchase was an option,
exercisable until July 30, 2000, to acquire the existing $85.0 million second
mortgage on the property for 220,000 Common Units (5,000 Common Units per month
during the option period which are non-refundable) of the Operating Partnership
(subject to certain adjustments as defined) and an option to purchase the equity
ownership of the property during the period from January 15, 2004 to February
15, 2004 for a price equal to the greater of the fair market value of the
interest or $2,000. The Company will also provide property management and
leasing services for the property pursuant to a 10-year management and leasing
contract.
    
 
4. DEFERRED COSTS
 
    Deferred costs consist of the following:
 
<TABLE>
<CAPTION>
                                                                             DECEMBER 31
                                                                        ----------------------
 
<S>                                                                     <C>         <C>
                                                                           1997        1996
                                                                        ----------  ----------
 
Financing costs.......................................................  $    5,572  $    6,757
 
Leasing costs.........................................................      23,182      35,386
                                                                        ----------  ----------
 
                                                                            28,754      42,143
 
Less: Accumulated amortization........................................        (282)    (15,260)
                                                                        ----------  ----------
 
                                                                        $   28,472  $   26,883
                                                                        ----------  ----------
                                                                        ----------  ----------
</TABLE>
 
                                      F-16
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
5. MORTGAGE NOTES AND BONDS PAYABLE
 
   
<TABLE>
<CAPTION>
                                                                                                DECEMBER 31
                                                                                         -------------------------
<S>                                                                                      <C>            <C>
                                                                                             1997          1996
                                                                                         -------------  ----------
 
Line-of-credit (Line-of-Credit) with various financial institutions, collateralized by
  the 77 West Wacker Building with maximum draw of $235,000, bearing interest at rates
  ranging from the higher of prime rate or federal funds rate plus 1/2%, to Eurodollar
  rate plus 1.2% to 1.5%, per annum (7.23% at December 31, 1997), as defined, with
  interest payable monthly and principal due November 2000. The Line-of-Credit has also
  been used to provide letters-of-credit totaling $75,848 as of December 31, 1997, on
  bonds payable described below........................................................  $     159,000  $   --
 
Mortgage note payable to a financial institution, collateralized by 1001 Technology
  Way, interest at 8.3% per annum with principal and interest payable monthly through
  October 2011.........................................................................          6,412      --
 
Mortgage notes payable to a financial institution, collateralized by various of the New
  Entities, interest at 7.19% per annum with interest payable monthly and principal due
  April 30, 1998 (See Notes 16 and 17.)................................................         83,500      --
 
Mortgage note payable to a financial institution collateralized by Continental Towers,
  interest at prime rate (8.50% at December 31, 1997) per annum with principal and
  interest payable monthly through January 1998........................................            698      --
 
Mortgage notes payable to various commercial lenders(A)................................       --           229,361
 
Mortgage notes payable to various financial institutions, interest at variable rate of
  prime plus 1/2% per annum and a fixed rate of 7.375% per annum with principal and
  interest payable monthly through October 1998........................................       --             6,525
                                                                                         -------------  ----------
 
                                                                                         $     249,610  $  235,886
                                                                                         -------------  ----------
                                                                                         -------------  ----------
Bonds payable:
  Variable rate taxable and tax-exempt bonds issued by various state and local
    government authorities(B),(C)......................................................  $      74,450  $   74,450
                                                                                         -------------  ----------
                                                                                         -------------  ----------
</TABLE>
    
 
- ------------------------
 
   
(A) 77 West Wacker had entered into a mortgage note agreement (Agreement) with a
    consortium of commercial lenders providing a maximum loan of $230,000 (Loan)
    and was collateralized by a first mortgage on the 77 West Wacker Building.
    The Loan was repaid with proceeds of the Offering and Private Placement.
    Under the terms of the Agreement, 77 West Wacker made monthly interest-only
    payments. Interest was calculated using certain variable rate indices, as
    defined. To reduce the impact of increases in interest rates, 77 West Wacker
    also entered into an interest rate swap agreement with affiliates of one of
    77 West Wacker's Third Party owners (Counterparties) for the outstanding
    principal balance on the Agreement up to a maximum principal amount of
    $230,000. Under the terms of the interest rate swap agreement, 77 West
    Wacker paid the Counterparties interest monthly at a
    
 
                                      F-17
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
5. MORTGAGE NOTES AND BONDS PAYABLE (CONTINUED)
    fixed rate of 10% per annum. 77 West Wacker was to receive monthly interest
    payments from the Counterparties at the variable rate and was then
    responsible for making the monthly interest payments required under the
    terms of the Agreement. 77 West Wacker incurred $692 of fees to terminate
    the swap agreement, which have been reflected in the extraordinary item --
    extinguishment of debt in the period from January 1, 1997 to November 16,
    1997.
 
(B) Permanent financing for the development of certain industrial properties has
    been provided by $48,150 of tax exempt industrial development revenue bonds
    (Bonds). (See Note 6--on December 13, 1995, and on May 20, 1996, the Bonds
    were acquired by independent third party financial institutions from an
    affiliate of PGI.) The Bonds mature on June 1, 2022.
 
   
   Under the terms of the Bond loan agreements, the borrowing partnerships are
    to make interest-only payments monthly, calculated using a floating rate
    determined by the Remarketing Agent of the Bonds. The rates ranged from
    3.35% to 4.75% during 1997, 2.85% to 4.40% during 1996, and 5.25% to 5.51%
    during 1995. The rate at both December 31, 1997 and December 31, 1996, was
    4.40%.
    
 
   The maximum annual interest rate on the Bonds is 13%. Under certain
    conditions, the interest rate on the Bonds may be converted to a fixed rate
    at the request of the borrowing Partnership.
 
   Beginning November 17, 1997, the Bonds were collateralized by letters of
    credit totaling $48,918 from the Line-of-Credit. From May 1996 to November
    16, 1997, the Bonds were collateralized by letters of credit that required
    the borrowing PGI Partnerships to pay financing fees of 1.75% per annum of
    the face amount, payable quarterly in advance.
 
   The bondholders may tender bonds on any business day during the variable
    interest rate period discussed above and receive principal, plus accrued
    interest through the tender date. Upon tender, the remarketing agent shall
    immediately remarket the Bonds. In the event the remarketing agent fails to
    remarket any Bonds, the borrowing Partnerships are obligated to purchase
    those Bonds. The remarketing agent receives a fee of .11% per annum of the
    outstanding Bonds balance, payable quarterly in advance.
 
   
(C) Permanent financing for the development of certain office properties has
    been provided by $26,300 of tax exempt industrial revenue bonds (IRBs). The
    IRB's mature on December 1, 2014. Under the terms of the IRB agreements, the
    borrowing Partnerships are to make interest-only payments monthly,
    calculated using a floating rate determined by the remarketing agent of the
    IRBs. The rates ranged from 3.35% to 3.85% during 1997, 3.40% to 4.05%
    during 1996, and 3.40% to 4.50% during 1995. The rates at December 31, 1997,
    were 3.85% and at December 31, 1996, were 3.50%.
    
 
   Under certain conditions, the interest rates on the IRBs may be converted to
    a fixed rate at the request of the borrowing partnerships.
 
   The IRBs are collateralized by letters of credit totaling $26,930 from the
    Line-of-Credit.
 
   Under the terms of the IRB agreements, the bondholders have the option to
    require the borrowing Partnerships to purchase any of its IRBs on the 15th
    day of any month while the IRBs are outstanding. Upon the exercise of the
    bondholders' option to purchase the IRBs, the remarketing agent shall
 
                                      F-18
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
5. MORTGAGE NOTES AND BONDS PAYABLE (CONTINUED)
    immediately remarket the IRBs. In the event the remarketing agent fails to
    remarket the IRBs, the borrowing Partnerships are obligated to purchase
    those IRBs.
 
   Total interest paid on the mortgage notes payable and bonds payable was
    $1,855 and $25,731 for the period from November 17, 1997 to December 31,
    1997, and the period from January 1, 1997 to November 16, 1997,
    respectively, and $25,643 and $25,490 for the years ended December 31, 1996
    and 1995, respectively.
 
6. MORTGAGE NOTES AND BONDS PAYABLE--AFFILIATES
 
   
<TABLE>
<CAPTION>
                                                                                                      DECEMBER 31
                                                                                                  --------------------
<S>                                                                                               <C>        <C>
                                                                                                    1997       1996
                                                                                                  ---------  ---------
Mortgage note payable--Limited partner, collateralized by 801 Technology Way, interest at 7.0%
  per annum, with principal and interest due January 2, 1998....................................  $   3,984  $      --
Mortgage notes payable--Affiliate(A)............................................................     --         99,357
Mortgage note payable--Affiliate; interest at 9.5% per annum with interest payable quarterly and
  principal and accrued interest due on maturity date of March 7, 1998..........................     --            290
                                                                                                  ---------  ---------
                                                                                                  $   3,984  $  99,647
                                                                                                  ---------  ---------
                                                                                                  ---------  ---------
Bonds payable--Affiliate:
Variable rate taxable and tax-exempt bonds issued by state and local government authorities(B)    $  --      $  12,000
                                                                                                  ---------  ---------
                                                                                                  ---------  ---------
</TABLE>
    
 
- ------------------------
 
   
(A) 77 West Wacker had entered into a 11% subordinate loan agreement with
    affiliates of its Third Party owner for a maximum disbursement amount of
    $60,000. A portion of the loan was repaid ($4,895) with proceeds of the
    Offering and the Private Placement, and a portion was considered repaid from
    the swap agreement between PGI and the Third Party related to the Loan in
    Note 5 ($42,584 was recorded as a contribution from PGI in the period from
    January 1, 1997 to November 17, 1997) and the remainder was forgiven
    ($67,847), as of November 16, 1997 and included in the extraordinary item --
    extinguishment of debt in the period from January 1, 1997 to November 16,
    1997. As of December 31, 1996 and 1995, $56,787 and $50,896, respectively,
    has been funded under this agreement, and $40,873 and $30,871, respectively,
    of accrued interest and $1,697 and $1,175, respectively, of standby loan
    fees, have been added to the principal balance in accordance with the terms
    of the agreement. The Third Party owner has provided a guarantee of 77 West
    Wacker's first mortgage note payable and charges 77 West Wacker a standby
    loan fee, as defined, which is included as a component of interest expense.
    Standby loan fees incurred were $460 for the period from January 1, 1997 to
    November 16, 1997, and $522 and $498 for the years ended December 31, 1996
    and 1995, respectively, (included in general and administrative expenses in
    the combined statements of operations of the Predecessor). Under the terms
    of the subordinate loan agreement, 77 West Wacker was not required to make
    any periodic principal or interest payments prior to the date of
    stabilization, as defined; unpaid interest is added to the principal balance
    monthly. Subsequent to the date of stabilization, as
    
 
                                      F-19
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
6. MORTGAGE NOTES AND BONDS PAYABLE--AFFILIATES (CONTINUED)
    defined, monthly payments of interest only are payable to the extent of
    available cash flow, as defined, during the operating period, with the
    entire outstanding balance due upon maturity.
 
   
(B) Permanent financing for the development of certain industrial properties has
    been provided by $12,000 of tax exempt bonds which were converted to taxable
    debt industrial development revenue bonds (IDBs). The Bonds mature on June
    1, 2022. On November 17, 1997, PGI contributed the related bond receivables
    held by an affiliate as part of its contribution to the Operating
    Partnership. On December 13, 1995, $60,150 of IDBs were acquired by an
    affiliate of PGI from the Third Party. On December 13, 1995, $28,300 and on
    May 20, 1996, $19,850 of the IDBs were sold to independent third party
    financial institutions by the affiliate of PGI.
    
 
   
   Under the terms of the IDB loan agreement, the borrowing Partnerships are to
    make interest-only payments semi-annually, calculated using a floating rate
    determined by the Remarketing Agent of the IDBs. The rates were 5.501%
    during 1997, 3.90% to 5.501% during 1996, and 5.25% to 5.51% during 1995.
    
 
   The maximum annual interest rate on the IDBs is 13%. Under certain
    conditions, the interest rate on the IDBs may be converted to a fixed rate
    at the request of the respective borrowing Partnership. The bondholders may
    tender bonds on any business day during the variable interest rate period
    discussed above and receive principal, plus accrued interest through the
    tender date. Upon tender, the remarketing agent shall immediately remarket
    the IDBs. In the event the remarketing agent fails to remarket any IDBs, the
    borrowing Partnership is obligated to purchase those IDBs. The remarketing
    agent receives a fee of .11% per annum of the outstanding IDB balance,
    payable quarterly in advance.
 
    Included in the extraordinary item -- extinguishment of debt in the period
from January 1, 1997 to November 16, 1997, are $1,000 in loan termination fees
paid to an affiliate of the Third Party and the write-off of unamortized
deferred financing of $165.
 
    In 1995, mortgage notes payable to the Third Party totaling $2,716 and
accrued interest of $200 were forgiven by the Third Party. The notes bore
interest at 8.5%, payable quarterly from available cash flow.
 
   
    Total interest paid on the mortgage notes payable and bonds payable to
affiliates was $32 for the period from January 1, 1997 to November 16, 1997 and
$1,256 and $3,538 for the years ended December 31, 1996 and 1995, respectively.
No interest was paid for the period from November 17, 1997 to December 31, 1997.
    
 
7. FUTURE MINIMUM LEASE INCOME AND PAYMENTS
 
   
    The Company has entered into lease agreements with lease terms ranging from
one year to twenty years. The leases generally provide for tenants to share in
increases in operating expenses and real estate taxes in excess of specified
base amounts.
    
 
    Approximately 39% and 57%, 60% and 65%, of the rental revenue for the period
from November 17, 1997 to December 31, 1997, and the period from January 1, 1997
to November 16, 1997, and for the years ended December 31, 1996 and 1995,
respectively, was received from four tenants.
 
                                      F-20
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
7. FUTURE MINIMUM LEASE INCOME AND PAYMENTS (CONTINUED)
    The total future minimum rentals to be received under such noncancelable
operating leases executed through December 31, 1997, exclusive of tenant
reimbursements and contingent rentals, are as follows:
 
<TABLE>
<CAPTION>
YEAR ENDED DECEMBER 31                                            AMOUNT
- --------------------------------------------------------------  ----------
<S>                                                             <C>
1998..........................................................  $   56,322
1999..........................................................      52,738
2000..........................................................      47,232
2001..........................................................      40,373
2002..........................................................      35,763
Thereafter....................................................     145,908
                                                                ----------
                                                                $  378,336
                                                                ----------
                                                                ----------
</TABLE>
 
    Future minimum rentals include amounts to be received from the Company
totaling $2,546 and from PGI totaling $3,710.
 
   
    In addition, as a part of lease agreements entered into with certain tenants
of 77 West Wacker Building, 77 West Wacker assumed the tenants' leases at other
properties and subsequently executed subleases for certain of the assumed lease
space. Net future minimum rental payments due under leases assumed and subleases
executed through December 31, 1997, are as follows:
    
 
<TABLE>
<CAPTION>
YEAR ENDED DECEMBER 31                                              AMOUNT
- -----------------------------------------------------------------  ---------
<S>                                                                <C>
1998.............................................................  $   1,210
1999.............................................................      1,235
2000.............................................................      1,263
2001.............................................................      1,293
2002.............................................................        757
                                                                   ---------
                                                                   $   5,758
                                                                   ---------
                                                                   ---------
</TABLE>
 
    During 1995, a tenant of the 77 West Wacker Building experienced financial
difficulties and began negotiations with 77 West Wacker to reduce its leased
space, resulting in an amendment to the tenant's lease agreement. As a result of
the lease amendment, 77 West Wacker wrote-off $13,373 of deferred tenant costs,
representing $10,296 of tenant receivables related to straight-lining of the
tenant's rental revenue, $2,257 of deferred leasing costs, and $820 of tenant
improvements. The same tenant continued to experience financial difficulty and
in 1997 defaulted on certain 1997 rental payments. As a result of the default,
as of December 31, 1996, 77 West Wacker wrote-off $3,081 of deferred tenant
costs, representing $940 of tenant receivables related to straight-lining of the
tenant's rental revenue and $2,141 of deferred leasing costs. In early November
1997, 77 West Wacker reached an agreement with the tenant to terminate the
lease. During the period from January 1, 1997 to November 16, 1997, 77 West
Wacker recognized revenue from this tenant only to the extent cash was received.
 
                                      F-21
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
8. PREFERRED SHARES
 
    The Company is authorized to issue up to 30,000,000 of non-voting preferred
shares of beneficial interest in one or more series. At December 31, 1997,
2,000,000 Cumulative Convertible Preferred Shares of Beneficial Interest with a
$0.01 par value were outstanding. The Preferred Shares have a liquidation
preference equivalent to $20.00 per share plus the amount equal to any accrued
and unpaid dividends thereon ("Liquidation Preference").
 
   
    Dividends on the Preferred Shares are payable quarterly at the greater of:
(i) (x) an annual rate equal to the product of the Issue Price ($20.00)
multiplied by 0.07% for Dividend Periods ending before November 17, 1998 (The
Company declared a dividend of $0.173 per Preferred Share on December 31,
1997.), and (y) an annual rate equal to the product of the Issue Price
multiplied by 0.075% for dividend periods ending after November 17, 1998, or
(ii) the regular cash dividends (determined on each dividend payment date) on
the Common Shares, or portion thereof, into which a Preferred Share is
convertible. The amount of dividends referred to in clause (i) above payable for
each full dividend period on the Preferred Shares, other than the dividend
period commencing October 1, 1998, shall be computed by dividing the annual
dividend rate by four. For the dividend period commencing October 1, 1998, the
amount of dividends through November 17, 1998, on the Preferred Shares shall be
computed by dividing the product of the Issue Price times 0.07% by 365 and
multiplying the result by the number of days from October 1, 1998 through
November 17, 1998 and dividends from November 18, 1998 through December 31,
1998, on the Preferred Shares shall be computed by dividing the product of the
Issue Price times .075% by 365 and multiplying the result by the number of days
from November 18, 1998 through December 31, 1998. The amount of dividends
referred to in clause (ii) above shall equal the number of Common Shares, or
portion thereof, into which a Preferred Share will be convertible on or after
the conversion date as defined, multiplied by the most current quarterly
dividend on a Common Share on or before the applicable dividend payment date.
The Preferred Shares are convertible into shares of Common Shares, at the
shareholders' option, upon the earliest to occur of: (i) September 17, 1998,
(ii) the first day on which a change of control occurs, as defined, (iii) the
occurrence of a REIT termination event, as defined, or (iv) such date as
determined by the Company (the Conversion Date), to convert all or any portion
of such shares (or such shares as determined by the Company if pursuant to
clause (iv) above) into the number of fully paid and non-assessable Common
Shares obtained by dividing the aggregate Liquidation Preference Amount of such
shares by the conversion price by surrendering such shares to be converted. In
the case of Preferred Shares called for redemption, conversion rights shall
expire at the close of business on the fifth business day prior to the
redemption date fixed for such redemption.
    
 
    The Company has the right to redeem the Preferred Shares beginning on and
after November 17, 2007, in cash equal to 100% of the Liquidation Preference.
Notwithstanding, anything above to the contrary, beginning on June 17, 1998, and
ending on September 17, 1998, the Company, at its option, may redeem all, but
not less than all, of the Preferred Shares at a premium (the "Special Redemption
Price") calculated to result in a total internal rate of return to the holder
(including the receipt of dividends and calculated on an annual compounded basis
as if the holder had owned the shares since the Issue Date) of 20.0%. The
Special Redemption Price may be paid, at the Company's option, in any
combination of: (i) cash, and (ii) Common Shares valued at fair market value;
provided, that the cash portion of the Special Redemption Price shall equal at
least 75.0% of the Special Redemption Price.
 
                                      F-22
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
8. PREFERRED SHARES (CONTINUED)
    The holders of the Preferred Shares have the right to elect two additional
members to the Company's Board of Directors if the equivalent of two quarterly
dividends are in arrears. Each of such two directors will be elected to serve
until the earlier of: (1) the election and qualification of such directors'
successor, or (2) payment of the dividend average.
 
9. EARNINGS PER SHARE
 
   
    The following table sets forth the computation of basic and diluted net
income available per weighted-average common share of beneficial interest for
the period from November 17, 1997 to December 31, 1997:
    
 
   
<TABLE>
<S>                                                               <C>
Numerator:
  Net income available to common shareholders...................  $     447
                                                                  ---------
                                                                  ---------
Denominator:
  Weighted-average common shares of beneficial interest.........  12,593,000
                                                                  ---------
                                                                  ---------
Net income available per weighted-average common share of
  beneficial interest--basic and diluted........................  $     .04
                                                                  ---------
                                                                  ---------
</TABLE>
    
 
    Options to purchase 1,223,000 Common Shares at $20.00 per share were
outstanding during the period from November 17, 1997 to December 31, 1997 but
were not included in the computation of diluted earnings per share because the
options' exercise price was greater than the average market price of the common
shares and, therefore, the effect would be antidilutive.
 
    The Company had 10,250,882 Common Units outstanding during the period from
November 17, 1997 to December 31, 1997, of which 9,323,782 may be converted into
Common Shares, after one year from the completion of the Offering at the option
of the Company. The Convertible Common Units, on a one for one basis, were not
included in the computation of diluted earnings per share because the conversion
would be antidilutive.
 
    The Company had 2,000,000 Preferred Shares outstanding during the period
from November 17, 1997 to December 31, 1997 but were not included in the
computation of diluted earnings per share because the conversion would be
antidilutive.
 
10. EMPLOYEE BENEFIT PLANS
 
    On November 17, 1997 the Company established a Share Incentive Plan (the
"Plan") which permits the grant of stock options, stock appreciation rights,
restricted stock, restricted units and performance units to officers and other
key employees of the Company, its subsidiaries, the Operating Partnership, the
Services Company and Company-owned partnerships. The Plan also permits the grant
of stock options to non-employee Trustees.
 
   
    Under the Plan, up to 1,850,000 Common Shares may be issued or transferred
to participants. The maximum aggregate number of Common Shares and Share
equivalent units that may be subject to awards granted during any calendar year
to any one participant under the Plan, regardless of the type of awards,
    
 
                                      F-23
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
10. EMPLOYEE BENEFIT PLANS (CONTINUED)
   
will be 200,000. This limit will apply regardless of whether such compensation
is paid in Common Shares or Share equivalent units.
    
 
    The effects on unaudited pro forma net income and pro forma earnings per
common share for the period from November 17, 1997 to December 31, 1997of
amortizing to expense the estimated fair value of stock options are not
necessarily representative of the effects on net income to be reported in future
years due to such things as vesting period of the stock options, and the
potential for issuance of additional stock options in future years. For purposes
of pro forma disclosures, the estimated fair value of the options is amortized
to expense over the options' vesting period.
 
    Under the Plan, each person serving as a Trustee on November 17, 1997,
received options to acquire 5,000 shares. Stock options granted to the Trustees
have a term of 10 years and will vest and be exercisable at the rate of 33.3%
per year over three years commencing on the first anniversary of their date of
grant. On November 17, 1997, each of the seven Trustees received options to
acquire 5,000 shares at $20.00 per share (the closing price on the day of the
grant of the options).
 
    The Board administers the Plan and has the authority to determine, among
other things, the individuals to be granted options, the exercise price at which
shares may be acquired, the number of shares subject to options and the vesting
requirements and the exercise period of each option. The Board is granted
discretion to determine the term of each option granted under the Plan to
employees, executives and Trustees, but in no event will the term exceed ten
years and one day from the date of the grant. On November 17, 1997, the Board
granted options to purchase a total of 1,113,000 shares at an exercise price of
$20.00 per share (the closing price on the day of the grant of the options) to
various executives and employees of the Company. Options for the shares granted
under the Plan to executives and employees have a term of 10 years and will be
exercisable and vest in installments as follows: (i) 33.3% of the number of
shares commencing in the first anniversary of the date of grant; (ii) an
additional 33.3% for the shares commencing on the second anniversary of the date
of the grant; and (iii) the remainder of the shares commencing on the third
anniversary of the date of grant.
 
    Under a consulting agreement between the Company and an executive of the
Company, the Board granted options to purchase 75,000 shares at an exercise
price of $20.00 per share. Pursuant to the agreement, the options granted have a
term of 10 years and will be exercisable and vest at the rate of 33.3% per year
over three years commencing on the first anniversary of their date of grant.
 
    The unaudited pro forma information regarding net income and earnings per
share is required by SFAS No. 123, and has been determined as if the Company had
accounted for its options under the fair value method of that statement. The
fair value for the options was estimated at the date of grant using a
Black-Scholes option pricing model with the following weighted average
assumptions for 1997; risk free interest rate of 5.41%, dividend yield of 6.7%;
volatility factor of the expected market price of the Company's common stock of
 .156; and a weighted-average expected life of the options of ten years. The
unaudited pro forma expense would be $69 ($0.01 per Common Share) for the period
from November 17, 1997 to December 31, 1997.
 
    The Black-Scholes options valuation model was developed for use in
estimating the fair value of traded options which have no vesting restrictions
and are fully transferable. In addition, option valuation models require the
input of highly subjective assumptions including the expected stock price
volatility.
 
                                      F-24
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
10. EMPLOYEE BENEFIT PLANS (CONTINUED)
Because changes in the subjective input assumptions can materially affect the
fair value estimate, in management's opinion the existing models do not
necessarily provide a reliable single measure of the fair value of the options
granted under the Plan.
 
    A summary of the Company's stock option activity, and related information
for the period from November 17, 1997 through December 31, 1997 follows:
 
<TABLE>
<CAPTION>
                                                                                 WEIGHTED
                                                                    SHARES        AVERAGE
                                                                  SUBJECT TO     EXERCISE
                                                                    OPTION    PRICE PER SHARE
                                                                  ----------  ---------------
<S>                                                               <C>         <C>
Initial options granted.........................................   1,223,000     $   20.00
Options canceled................................................      --            --
                                                                  ----------        ------
Balance at December 31, 1997....................................   1,223,000     $   20.00
                                                                  ----------        ------
                                                                  ----------        ------
</TABLE>
 
    At December 31, 1997, no options were exercised and options on 627,000
shares were available for future grant. Exercise prices for options outstanding
at December 31, 1997 were $20.00 per share. The remaining weighted-average
contractual life of these options was 9.88 years. The weighted-average grant
date fair value of all options granted during the period is $1.39.
 
11. RELATED PARTY TRANSACTIONS
 
    The Company owns 100% of the nonvoting preferred stock of the Service
Company which has an initial carrying value of $425 and has provided a loan in
the amount of $4,800 to the Service Company (included in due from affiliates at
December 31, 1997). The loan bears interest at 11% per annum, with interest
payable monthly and principal due November 2007. During the period from November
17, 1997 to December 31, 1997, the Company recorded interest income of $66
(included in due from affiliates) related to the loan and $19, representing the
Company's share of the Service Company's loss from operations for the same
period. (The net of $47 is included in other income.) No interest income was
received during the period. In addition, the Company has made non-interest
bearing advances to the Service Company, of which approximately $392 is
outstanding at December 31, 1997 and included in due from affiliates.
 
                                      F-25
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
11. RELATED PARTY TRANSACTIONS (CONTINUED)
 
    In connection with the leasing and management of the Prime Properties, PGI
was entitled to payments and fees for services performed. Such amounts incurred
during the period from January 1, 1997 to November 16, 1997, and for the years
ended December 31, 1996 and 1995, are summarized as follows:
 
<TABLE>
<CAPTION>
                                                               PERIOD FROM
                                                               JANUARY 1,    YEAR ENDED DECEMBER
                                                                 1997 TO              31
                                                              NOVEMBER 16,   --------------------
                                                                  1997         1996       1995
                                                              -------------  ---------  ---------
<S>                                                           <C>            <C>        <C>
Property management fee(a)..................................    $   1,238    $   1,429  $   1,364
Administration fees(b)......................................          463          468        730
Construction management(c)..................................           --          102        115
Legal fees(d)...............................................          271          127         77
Leasing fees(e).............................................            2           19        280
Reimbursables(f)............................................          252          184        352
Asset management fee(g).....................................          110          132        132
</TABLE>
 
- ------------------------
 
(a) PGI was entitled to a property management fee ranging from 2.5% to 4% of
    gross receipts, payable monthly in arrears. Amounts are included in property
    and asset management fees to affiliates in the combined financial statements
    of the Predecessor.
 
(b) PGI was entitled to an annual administration fee as defined in the
    Partnership agreement. Amounts are included in general and administrative
    expenses in the combined financial statements of the Predecessor.
 
(c) PGI was entitled to a construction management fee equal to 3% of
    construction costs.
 
(d) PGI was reimbursed for reasonable legal and accounting expenses incurred in
    connection with the operations of the Partnerships. Amounts are included in
    general and administrative expenses in the combined financial statements of
    the Predecessor.
 
(e) PGI was entitled to leasing commissions for all leases signed. The
    commissions are equal to 1.5% to 3% of rent, exclusive of tenant
    reimbursements, during the base term of the lease; commissions were payable
    upon commencement of the respective leases.
 
(f) PGI was entitled to reimbursement for expenses paid for the benefit of the
    Partnerships. Amounts are included in general and administrative expenses in
    the combined financial statements of the Predecessor.
 
(g) PGI was entitled to an annual fee from providing asset management services
    to the Partnership which is payable from available cash flows. Amounts are
    included in property and asset management fees to affiliates in the combined
    financial statements of the Predecessor.
 
    Amounts due to affiliates are for amounts due for advances made by
affiliates. Amounts due from affiliates are for advances made by the Partnership
to affiliates. Amounts due from and due to affiliates bore interest at prime
plus 2% and were payable upon demand. Any unpaid amounts due to affiliates or
 
                                      F-26
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
11. RELATED PARTY TRANSACTIONS (CONTINUED)
   
amounts due from affiliates as of November 16, 1997, have been reflected as
distributions to or contributions from PGI.
    
 
    Average balances of amounts due from and due to affiliates for the period
from January 1, 1997 to November 16, 1997, and for the years ended December 31,
1996 and 1995, were summarized as follows:
 
<TABLE>
<CAPTION>
                                                            PERIOD FROM     YEAR ENDED DECEMBER
                                                          JANUARY 1, 1997            31
                                                                TO          --------------------
                                                         NOVEMBER 16, 1997    1996       1995
                                                         -----------------  ---------  ---------
<S>                                                      <C>                <C>        <C>
Due from affiliates....................................      $   1,447      $   4,323  $   3,251
Due to affiliates......................................            354            821      1,107
</TABLE>
 
12. INSURANCE SETTLEMENT
 
    On July 16, 1994, the Enterprise Center I property was destroyed by a fire.
During 1995, ECI received a final insurance settlement of $10,871 related to the
fire. The proceeds settled an insurance receivable of $1,755 recorded at
December 31, 1994, and additional costs of $1,859 incurred in 1995 related to
the cleanup of the property. ECI believes that all material costs of the fire
were incurred prior to December 31, 1995. The remaining proceeds of $7,257 have
been recorded as revenue in the 1995 combined statement of operations.
 
13. FAIR VALUES OF FINANCIAL INSTRUMENTS
 
    Statements of Financial Accounting Standards No. 107, Disclosures About Fair
Value of Financial Instruments (SFAS No. 107) and No. 119, Disclosure about
Derivative Financial Instruments and Fair Value of Financial Instruments
requires disclosures of the fair value of certain on-and off-balance sheet
financial instruments for which it is practicable to estimate. Fair value is
defined by SFAS No. 107 as the amount at which the instrument could be exchanged
in a current transaction between willing parties, other than in a forced or
liquidation sale.
 
    The following methods and assumptions were used by the Company and the PGI
Partnerships in estimating their fair value disclosures for financial
instruments.
 
CASH AND CASH EQUIVALENTS
 
    The carrying amount of cash and cash equivalents reported in the
consolidated and combined balance sheets approximates its fair value.
 
    The Company maintains its cash and cash equivalents at financial
institutions. The combined account balances at each institution periodically
exceed FDIC insurance coverage, and as a result, there is a concentration of
credit risk related to amounts on deposit in excess of FDIC insurance coverage.
Management believes that the risk is not significant.
 
                                      F-27
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
13. FAIR VALUES OF FINANCIAL INSTRUMENTS (CONTINUED)
MORTGAGE NOTES AND BONDS PAYABLE
 
   
    The carrying amount of the Company's and the PGI Partnerships' variable and
fixed rate borrowings approximates fair value based on the current borrowing
rate for similar types of borrowing arrangements.
    
 
    The carrying amount of accrued interest in the consolidated and combined
balance sheets approximates fair value.
 
14. COMMITMENTS AND CONTINGENCIES
 
    The Company is a defendant in legal actions arising during the normal course
of business. Management believes that the ultimate outcome of those actions will
not materially affect the Company's consolidated financial position.
 
   
    All of the Prime Properties and New Entities were subject to Phase I or
similar environmental assessment by independent environmental consultants which
were intended to discover information regarding, and to evaluate the
environmental condition of, the surveyed property and surrounding properties.
Management is aware of contamination at certain of the industrial properties
included in the Prime Properties, which are already in remediation programs
sponsored by the state in which they are located. The Phase I assessments
estimate that remedial action plans will have a probable cost of approximately
$3,205. During 1997, PGI initiated lawsuits against a former environmental
consultant and a former tenant of one of these properties for damages to cover
the cost of the remedial action plans. However, the outcome of the lawsuits
cannot yet be determined and the actual cost to be incurred by the Company
cannot yet be determined. During 1997, the PGI Partnerships recorded a liability
of $3,205 (included in accounts payable and accrued expenses at December 31,
1997). PGI has contractually agreed to indemnify the Company from any
environmental liabilities the Company may incur.
    
 
15. UNAUDITED PRO FORMA CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
 
    The accompanying unaudited Pro Forma Condensed Consolidated Statements of
Operations of the Company are presented as if, at January 1, 1996, (i) the
Company had completed the Offering, the Private Placement, and the Overallotment
and contributed the net proceeds to the Operating Partnership, (ii) PGI and
Contributors had contributed certain of their respective properties and
operations (the Contribution Properties) to the Operating Partnership, (iii) the
Operating partnership had completed the sale of Common Units to Primestone, (iv)
the Operating Partnership acquired various office and industrial properties (the
Acquisition Properties), and Continental Management Business from various third
parties, and (v) the Operating Partnership repaid debt on certain of the
Contribution Properties. The unaudited pro forma Condensed Consolidated
Statements of Operations should be read in conjunction with unaudited Pro Forma
condensed consolidated financial statements and all of the historical financial
statements contained in the Prospectus. In management's opinion, all adjustments
necessary to reflect the effects of the Offering and the Private Placement have
been made.
 
    The unaudited Pro Forma Condensed Consolidated Statements of Operations of
the Company are not necessarily indicative of what the actual results of
operations would have been assuming the Offering, the Private Placement, and the
Overallotment had occurred at the dates indicated above, nor do they purport to
represent the future results of operations of the Company.
 
                                      F-28
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
15. UNAUDITED PRO FORMA CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
(CONTINUED)
                     CONSOLIDATED STATEMENTS OF OPERATIONS
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
                                  (UNAUDITED)
 
   
<TABLE>
<CAPTION>
                                                                    YEAR ENDED DECEMBER 31,
                                                                   --------------------------
                                                                       1997          1996
                                                                   ------------  ------------
<S>                                                                <C>           <C>
Total revenue....................................................   $  100,465    $   98,515
                                                                   ------------  ------------
                                                                   ------------  ------------
Net income.......................................................   $    9,328    $    7,797
                                                                   ------------  ------------
                                                                   ------------  ------------
Earnings per common share........................................   $     0.50    $     0.38
                                                                   ------------  ------------
                                                                   ------------  ------------
</TABLE>
    
 
16. REAL ESTATE AND ACCUMULATED DEPRECIATION
   
<TABLE>
<CAPTION>
                                                              COST CAPITALIZED
                                      INITIAL COST TO          SUBSEQUENT TO
                                                                                         GROSS AMOUNT CARRIED
                                          COMPANY               ACQUISITION              AT DECEMBER 31, 1997
                                   ----------------------  ----------------------  ---------------------------------
                    DECEMBER 31,               BUILDING                BUILDING                BUILDING
                        1997                      AND                     AND                     AND
                    -------------              IMPROVE-                IMPROVE-                IMPROVE-
DESCRIPTION         ENCUMBRANCES     LAND        MENTS       LAND        MENTS       LAND        MENTS       TOTAL
- ------------------  -------------  ---------  -----------  ---------  -----------  ---------  -----------  ---------
<S>                 <C>            <C>        <C>          <C>        <C>          <C>        <C>          <C>
OFFICE
77 W.Wacker Bldg..    $ 159,000    $  17,637   $ 162,755   $  --       $  --       $  17,637   $ 162,755   $ 180,392
Nashville Office
  Bldg............        4,800        1,530       7,072      --          --           1,530       7,072       8,602
Professional
  Plaza...........        9,000       --           7,090      --          --          --           7,090       7,090
Old Kingston......        3,500          378       2,808      --          --             378       2,808       3,186
Two Center
  Square..........        9,000       --           7,379      --          --          --           7,379       7,379
Triad Parking
  Facility........       --              507       1,046      --          --             507       1,046       1,553
Hammond Enterprise
  Center..........       --               26         614      --          --              26         614         640
Chicago Enterprise
  Center..........       --              775         975      --          --             775         975       1,750
1990 Algonquin
  Road(1).........       --            1,554       6,393      --          --           1,554       6,393       7,947
2010 Algonquin
  Road(1).........       --              509       2,044      --          --             509       2,044       2,553
555 Huehl
  Road(1).........       --            1,291       5,164      --          --           1,291       5,164       6,455
1669 Woodfield
  Road(1).........       --            1,962       7,853      --          --           1,962       7,853       9,815
475 Superior
  Avenue..........       --            2,700      10,801      --          --           2,700      10,801      13,501
2205-2255
  Enterprise
  Drive(1)........       --            2,304       9,259      --          --           2,304       9,259      11,563
280 Shuman Blvd...       --            1,264       5,056      --          --           1,264       5,056       6,320
Continental
  Towers..........          698       21,831      87,324      --          --          21,831      87,324     109,155
2675 Mayfair......       --            1,613       6,450      --          --           1,613       6,450       8,063
 
INDUSTRIAL
ECEC..............       --               27         533      --          --              27         533         560
EC I..............        2,900          595      --          --          --             595      --             595
EC II.............        5,000           18       2,360      --          --              18       2,360       2,378
 
<CAPTION>
 
                     DECEMBER 31,
                         1997
                    ---------------      DATE OF
                      ACCUMULATED    ACQUISITION(A)
DESCRIPTION         DEPRECIATION(1)  CONTRIBUTION(C)
- ------------------  ---------------  ---------------
<S>                 <C>              <C>
OFFICE
77 W.Wacker Bldg..     $    (835)         1997(C)
Nashville Office
  Bldg............           (29)         1997(C)
Professional
  Plaza...........           (71)         1997(C)
Old Kingston......           (25)         1997(C)
Two Center
  Square..........           (74)         1997(C)
Triad Parking
  Facility........            (5)         1997(C)
Hammond Enterprise
  Center..........            (4)         1997(C)
Chicago Enterprise
  Center..........          (162)         1997(C)
1990 Algonquin
  Road(1).........           (19)         1997(A)
2010 Algonquin
  Road(1).........            (6)         1997(A)
555 Huehl
  Road(1).........           (27)         1997(A)
1669 Woodfield
  Road(1).........           (24)         1997(A)
475 Superior
  Avenue..........           (29)         1997(A)
2205-2255
  Enterprise
  Drive(1)........           (27)         1997(A)
280 Shuman Blvd...           (16)         1997(A)
Continental
  Towers..........          (126)         1997(A)
2675 Mayfair......            (1)         1997(A)
INDUSTRIAL
ECEC..............            (4)         1997(C)
EC I..............            (4)         1997(C)
EC II.............           (14)         1997(C)
</TABLE>
    
 
                                      F-29
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
16. REAL ESTATE AND ACCUMULATED DEPRECIATION (CONTINUED)
   
<TABLE>
<CAPTION>
                                                              COST CAPITALIZED
                                      INITIAL COST TO          SUBSEQUENT TO
                                                                                         GROSS AMOUNT CARRIED
                                          COMPANY               ACQUISITION              AT DECEMBER 31, 1997
                                   ----------------------  ----------------------  ---------------------------------
                    DECEMBER 31,               BUILDING                BUILDING                BUILDING
                        1997                      AND                     AND                     AND
                    -------------              IMPROVE-                IMPROVE-                IMPROVE-
DESCRIPTION         ENCUMBRANCES     LAND        MENTS       LAND        MENTS       LAND        MENTS       TOTAL
- ------------------  -------------  ---------  -----------  ---------  -----------  ---------  -----------  ---------
<S>                 <C>            <C>        <C>          <C>        <C>          <C>        <C>          <C>
EC III............    $   4,500    $      20   $   7,038   $  --       $  --       $      20   $   7,038   $   7,058
EC IV.............        2,600           11       1,217      --          --              11       1,217       1,228
EC V..............        5,000           81       2,883      --          --              81       2,883       2,964
EC VI.............        4,900          101       2,936      --          --             101       2,936       3,037
EC VII............        7,200          548       4,968      --          --             548       4,968       5,516
EC VIII...........        7,000          151       2,493      --          --             151       2,493       2,644
EC IX.............        4,750          269       1,127      --          --             269       1,127       1,396
EC X..............        4,300          275       2,836      --          --             275       2,836       3,111
Arlington Heights
  I...............       --              617       2,638      --          --             617       2,638       3,255
Arlington Heights
  II..............       --              456       2,062      --          --             456       2,062       2,518
Arlington Heights
  III.............       --              452       1,938      --          --             452       1,938       2,390
2160 McGraw Rd....       --              904       3,617      --          --             904       3,617       4,521
4849 Groveport....       --              507       2,030      --          --             507       2,030       2,537
2400 McGraw Rd....       --              348       1,392      --          --             348       1,392       1,740
5160 Blazer
  Memorial Pkwy...       --              470       1,880      --          --             470       1,880       2,350
600 London Rd.....       --              223         890      --          --             223         890       1,113
4411 Marketing
  Place...........       --              445       1,780      --          --             445       1,780       2,225
1001 Technology
  Way.............        6,412        1,909       7,637      --          --           1,909       7,637       9,546
801 Technology
  Way.............        3,984          813       3,253      --          --             813       3,253       4,066
3818
  Grandville/1200
Northwestern(1)...       --            2,125       8,505      --          --           2,125       8,505      10,630
306-310 Era
  Drive(1)........       --              719       2,878      --          --             719       2,878       3,597
1301 Ridgeview
  Drive(1)........       --            2,287       9,148      --          --           2,287       9,148      11,435
515 Huehl Road/500
  Lindburg(1).....       --            1,775       7,100      --          --           1,775       7,100       8,875
455 Academy
  Drive(1)........       --              754       3,018      --          --             754       3,018       3,772
1051 N. Kirk
  Road(1).........       --              911       3,645      --          --             911       3,645       4,556
4211 Madison
  Street(1).......       --              690       2,759      --          --             690       2,759       3,449
200 E.
  Fullerton(1)....       --              525       2,100      --          --             525       2,100       2,625
350 Randy
  Road(1).........       --              267       1,063      --          --             267       1,063       1,330
4300,4248,4250
  Madison
  Street(1).......       --            1,147       4,588      --          --           1,147       4,588       5,735
370 Carol
  Lane(1).........       --              527       2,107      --          --             527       2,107       2,634
388 Carol
  Lane(1).........       --              332       1,329      --          --             332       1,329       1,661
941-961 Wiegel
  Drive(1)........       --            3,268      13,060      --          --           3,268      13,060      16,328
342-346 Carol
  Lane(1).........       --              600       2,398      --          --             600       2,398       2,998
343 Carol
  Lane(1).........       --              350       1,398      --          --             350       1,398       1,748
371-385 N. Gary
  Avenue(1).......       --              218         871      --          --             218         871       1,089
 
<CAPTION>
 
                     DECEMBER 31,
                         1997
                    ---------------      DATE OF
                      ACCUMULATED    ACQUISITION(A)
DESCRIPTION         DEPRECIATION(1)  CONTRIBUTION(C)
- ------------------  ---------------  ---------------
<S>                 <C>              <C>
EC III............     $     (41)         1997(C)
EC IV.............           (16)         1997(C)
EC V..............            22          1997(C)
EC VI.............           (20)         1997(C)
EC VII............           (51)         1997(C)
EC VIII...........            --          1997(C)
EC IX.............           (13)         1997(C)
EC X..............           (44)         1997(C)
Arlington Heights
  I...............           (28)         1997(C)
Arlington Heights
  II..............           (19)         1997(C)
Arlington Heights
  III.............           (18)         1997(C)
2160 McGraw Rd....           (47)         1997(A)
4849 Groveport....           (26)         1997(A)
2400 McGraw Rd....           (18)         1997(A)
5160 Blazer
  Memorial Pkwy...           (24)         1997(A)
600 London Rd.....           (11)         1997(A)
4411 Marketing
  Place...........           (23)         1997(A)
1001 Technology
  Way.............           (40)         1997(A)
801 Technology
  Way.............           (17)         1997(A)
3818
  Grandville/1200
Northwestern(1)...           (42)         1997(A)
306-310 Era
  Drive(1)........           (15)         1997(A)
1301 Ridgeview
  Drive(1)........           (48)         1997(A)
515 Huehl Road/500
  Lindburg(1).....           (37)         1997(A)
455 Academy
  Drive(1)........           (16)         1997(A)
1051 N. Kirk
  Road(1).........           (11)         1997(A)
4211 Madison
  Street(1).......            (9)         1997(A)
200 E.
  Fullerton(1)....            (7)         1997(A)
350 Randy
  Road(1).........            (3)         1997(A)
4300,4248,4250
  Madison
  Street(1).......           (14)         1997(A)
370 Carol
  Lane(1).........            (7)         1997(A)
388 Carol
  Lane(1).........            (4)         1997(A)
941-961 Wiegel
  Drive(1)........           (41)         1997(A)
342-346 Carol
  Lane(1).........            (7)         1997(A)
343 Carol
  Lane(1).........            (4)         1997(A)
371-385 N. Gary
  Avenue(1).......            (3)         1997(A)
</TABLE>
    
 
                                      F-30
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
16. REAL ESTATE AND ACCUMULATED DEPRECIATION (CONTINUED)
   
<TABLE>
<CAPTION>
                                                              COST CAPITALIZED
                                      INITIAL COST TO          SUBSEQUENT TO
                                                                                         GROSS AMOUNT CARRIED
                                          COMPANY               ACQUISITION              AT DECEMBER 31, 1997
                                   ----------------------  ----------------------  ---------------------------------
                    DECEMBER 31,               BUILDING                BUILDING                BUILDING
                        1997                      AND                     AND                     AND
                    -------------              IMPROVE-                IMPROVE-                IMPROVE-
DESCRIPTION         ENCUMBRANCES     LAND        MENTS       LAND        MENTS       LAND        MENTS       TOTAL
- ------------------  -------------  ---------  -----------  ---------  -----------  ---------  -----------  ---------
<S>                 <C>            <C>        <C>          <C>        <C>          <C>        <C>          <C>
350 N. Mannheim
  Road(1).........    $  --        $      81   $     325   $  --       $  --       $      81   $     325   $     406
1600-1700 167th
  Street(1).......       --            1,073       4,291      --          --           1,073       4,291       5,364
1301 E. Tower
  Road(1).........       --            1,005       4,020      --          --           1,005       4,020       5,025
4343 Commerce
  Court(1)........       --            5,370      21,480      --          --           5,370      21,480      26,850
11039 Gage
  Avenue(1).......       --              191         767      --          --             191         767         958
11045 Gage
  Avenue(1).......       --            1,274       5,092      --          --           1,274       5,092       6,366
1401 S.
  Jefferson(1)....       --              171         685      --          --             171         685         856
4100 Madison
  Street(1).......       --               42         169      --          --              42         169         211
4160-4190 Madison
  Street(1).......       --              931       3,708      --          --             931       3,708       4,639
550 Kehoe
  Blvd.(1)........       --              686       2,744      --          --             686       2,744       3,430
                    -------------  ---------  -----------  ---------  -----------  ---------  -----------  ---------
Total.............    $ 244,544    $  92,440   $ 496,839   $  --       $  --       $  92,440   $ 496,839   $ 589,279
                    -------------  ---------  -----------  ---------  -----------  ---------  -----------  ---------
                    -------------  ---------  -----------  ---------  -----------  ---------  -----------  ---------
 
<CAPTION>
 
                     DECEMBER 31,
                         1997
                    ---------------      DATE OF
                      ACCUMULATED    ACQUISITION(A)
DESCRIPTION         DEPRECIATION(1)  CONTRIBUTION(C)
- ------------------  ---------------  ---------------
<S>                 <C>              <C>
350 N. Mannheim
  Road(1).........     $      (1)         1997(A)
1600-1700 167th
  Street(1).......           (13)         1997(A)
1301 E. Tower
  Road(1).........           (13)         1997(A)
4343 Commerce
  Court(1)........           (67)         1997(A)
11039 Gage
  Avenue(1).......            (2)         1997(A)
11045 Gage
  Avenue(1).......           (16)         1997(A)
1401 S.
  Jefferson(1)....            (2)         1997(A)
4100 Madison
  Street(1).......            (4)         1997(A)
4160-4190 Madison
  Street(1).......           (11)         1997(A)
550 Kehoe
  Blvd.(1)........            (9)         1997(A)
                    ---------------
Total.............     $  (2,338)
                    ---------------
                    ---------------
</TABLE>
    
 
- ------------------------
 
(1) These properties are collateral for $83,500 in mortgage notes payable. See
    Note 5.
 
   
    The aggregate gross cost of the properties included above, for federal
income tax purposes, approximated $708,267 as of December 31, 1997.
    
 
    The following table reconciles the historical cost of the Company from
November 17, 1997 to December 31, 1997.
 
<TABLE>
<CAPTION>
                                                                                                      PERIOD FROM
                                                                                                      NOVEMBER 17,
                                                                                                        1997 TO
                                                                                                      DECEMBER 31,
                                                                                                          1997
                                                                                                      ------------
<S>                                                                                                   <C>
Additions during period -- Contributions, acquisition, improvements, etc............................   $  589,279
                                                                                                      ------------
Balance, close of period............................................................................   $  589,279
                                                                                                      ------------
                                                                                                      ------------
</TABLE>
 
                                      F-31
<PAGE>
                     PRIME GROUP REALTY TRUST (THE COMPANY)
          AND PREDECESSOR PROPERTIES (THE PREDECESSOR TO THE COMPANY)
 
      NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS (CONTINUED)
 
           (DOLLARS IN THOUSANDS, EXCEPT FOR SHARE AND UNIT AMOUNTS)
 
16. REAL ESTATE AND ACCUMULATED DEPRECIATION (CONTINUED)
    The following table reconciles the accumulated depreciation from November
17, 1997 to December 31, 1997.
 
<TABLE>
<CAPTION>
                                                                                                      PERIOD FROM
                                                                                                      NOVEMBER 17,
                                                                                                        1997 TO
                                                                                                      DECEMBER 31,
                                                                                                          1997
                                                                                                      ------------
<S>                                                                                                   <C>
Additions during period--Depreciation and amortization for the period...............................   $    2,338
                                                                                                      ------------
Balance, close of period............................................................................   $    2,338
                                                                                                      ------------
                                                                                                      ------------
</TABLE>
 
17. SUBSEQUENT EVENTS
 
    On January 14, 1998, the Company purchased 33 North Dearborn, an office
building, located in Chicago, Illinois, for a purchase price of $32,250.
 
   
    On January 23, 1998, the Company paid distributions of $.173 per Preferred
Share and $.166 per Common Share, to stockholders of record on December 31,
1997.
    
 
   
    On January 29, 1998, the Company refinanced a portion of certain mortgage
notes payable ($27,500 of the total face value of $83,500--see Note 5), with a
new mortgage note payable with an initial principal balance of $29,430
(Refinanced Note). The Refinanced Note has a maturity of 10 years, bears
interest at 6.85% per annum and requires monthly principal and interest payments
of $205 with unpaid principal due upon maturity.
    
 
    On February 20, 1998, the Company purchased Commerce Center, an office
building, located in Arlington Heights, Illinois, for a purchase price of
$28,438.
 
                                      F-32

<PAGE>

                                                                     Ex. 10.26



                                CREDIT AGREEMENT

                                      AMONG

                            PRIME GROUP REALTY, L.P.

                                       and

                            PRIME GROUP REALTY TRUST

                                       and

                                BANKBOSTON, N.A.

                                       and

                    PRUDENTIAL SECURITIES CREDIT CORPORATION


                                November 17, 1997

                                 Amended 12/15/97

<PAGE>

                               TABLE OF CONTENTS

Section 1   DEFINITIONS AND RULES OF INTERPRETATION........................   1
       Section 1.1   Definitions...........................................   1
       Section 1.2   Rules of Interpretation...............................  19

Section 2   REVOLVING CREDIT FACILITY......................................  20
       Section 2.1   Commitment to Lend; Limitation on Total Commitment....  20
       Section 2.2   Reduction of Commitment...............................  20
       Section 2.3   The Notes.............................................  20
       Section 2.4   Interest on Loans.....................................  21
       Section 2.5   Requests for Loans....................................  21
       Section 2.6   Conversion Options....................................  22
       Section 2.7   Funds for Loans.......................................  22
       Section 2.8.  IRB Indebtedness Account..............................  23
       Section 2.9.  Letters of Credit.....................................  24

Section 3   REPAYMENT OF THE LOANS.........................................  26
       Section 3.1   Maturity..............................................  26
       Section 3.2   Mandatory Repayments of Loan..........................  26
       Section 3.3   Optional Repayments of Loans..........................  27

Section 4   CERTAIN GENERAL PROVISIONS.....................................  28
       Section 4.1   Revolving Credit Facility Fees and Agent's Fee........  28
       Section 4.2   Commitment Fee........................................  28
       Section 4.3   Funds for Payments....................................  30
       Section 4.4   Computations..........................................  30
       Section 4.5   Additional Costs, Etc.................................  30
       Section 4.6   Capital Adequacy......................................  32
       Section 4.7   Certificate...........................................  32
       Section 4.8   Indemnity.............................................  32
       Section 4.9   Interest on Overdue Amounts...........................  32
       Section 4.10  Inability to Determine Eurodollar Rate................  33
       Section 4.11  Illegality............................................  33
       Section 4.12  Replacement of Lenders................................  33

Section 5   COLLATERAL SECURITY; NO LIMITATION ON RECOURSE.................  34
       Section 5.1   Collateral Security...................................  34
       Section 5.2.  No Limitation on Recourse.............................  34

<PAGE>

       Section 5.3.  Additional Properties.................................  34
       Section 5.4.  Conditions to Approval of Additional Properties.......  35
       Section 5.5.  Release of Mortgaged Properties.......................  36

Section 6.  REPRESENTATIONS AND WARRANTIES.................................  36
       Section 6.1.  Authority; Etc........................................  37
       Section 6.2.  Governmental Approvals................................  38
       Section 6.3.  Title to Properties...................................  38
       Section 6.4.  Financial Statements..................................  38
       Section 6.5.  No Material Changes, Etc..............................  39
       Section 6.6.  Franchises, Patents, Copyrights, Etc..................  39
       Section 6.7.  Litigation............................................  39
       Section 6.8.  No Materially Adverse Contracts, Etc..................  40
       Section 6.9.  Compliance With Other Instruments, Laws, Etc..........  40
       Section 6.10. Tax Status............................................  40
       Section 6.11. Event of Default......................................  40
       Section 6.12. Investment Company Act................................  40
       Section 6.13. Absence of Financing Statements, Etc..................  41
       Section 6.14. Setoff, Etc...........................................  41
       Section 6.15. Certain Transactions..................................  41
       Section 6.16. Benefit Plans: Multiemployer Plans: Guaranteed Pension 
                        Plans..............................................  41
       Section 6.17. Regulations U and X...................................  41
       Section 6.18. Environmental Compliance..............................  41
       Section 6.19. Subsidiaries and Affiliates...........................  43
       Section 6.20. Major Leases..........................................  43
       Section 6.21. Loan Documents........................................  43
       Section 6.22. Mortgaged Properties..................................  43

Section 7.  AFFIRMATIVE COVENANTS OF THE BORROWER..........................  47
       Section 7.1.  Punctual Payment......................................  47
       Section 7.2.  Maintenance of Office.................................  47
       Section 7.3.  Records and Accounts..................................  47
       Section 7.4.  Financial Statements, Certificates and Information....  47
       Section 7.5.  Notices...............................................  49
       Section 7.6.  Existence; Maintenance of REIT Status; Maintenance of 
                        Properties.........................................  50
       Section 7.7.  Insurance.............................................  51
       Section 7.8.  Taxes.................................................  51
       Section 7.9.  Inspection of Properties and Books; Confidential 
                        Information........................................  52
       Section 7.10. Compliance with Laws, Contracts, Licenses, and 
                        Permits............................................  52
       Section 7.11. Use of Proceeds.......................................  52
       Section 7.12. Appraisals............................................  52
       Section 7.13. Leases; Lease Approvals...............................  53
       Section 7.14. Further Assurance.....................................  53
       Section 7.15. Environmental Indemnification.........................  53

<PAGE>

       Section 7.16. Response Actions......................................  54
       Section 7.17. Environmental Assessments.............................  54
       Section 7.18. Employee Benefit Plans................................  54
       Section 7.19. Required Interest Rate Contracts......................  55

Section 8.  CERTAIN NEGATIVE COVENANTS OF THE BORROWER.....................  55
       Section 8.1   Restrictions on Indebtedness..........................  56
       Section 8.2.  Restrictions on Liens, Etc............................  56
       Section 8.3.  Restrictions on Investments...........................  58
       Section 8.4.  Merger, Consolidation and Disposition of Properties...  58
       Section 8.5.  Sale and Leaseback....................................  59
       Section 8.6.  Compliance with Environmental Laws....................  59
       Section 8.7.  Distributions.........................................  59
       Section 8.8.  Leases................................................  60

Section 9.  FINANCIAL COVENANTS OF THE BORROWER............................  60
       Section 9.1.  Collateral Value......................................  60
       Section 9.2.  Minimum Debt Service Coverage.........................  60
       Section 9.3.  Total Liabilities to Total Adjusted Assets............  61
       Section 9.4.  Minimum Tangible Net Worth............................  61
       Section 9.5.  Total Operating Cash Flow to Interest Expense.........  61
       Section 9.6.  EBITDA to Fixed Charges...............................  61

Section 10. CONDITIONS TO EFFECTIVENESS....................................  61
       Section 10.1. Loan Documents........................................  61
       Section 10.2. Certified Copies of Organization Documents; Good 
                        Standing Certificates..............................  61
       Section 10.3. By-laws; Resolutions..................................  62
       Section 10.4. Incumbency Certificate; Authorized Signers............  62
       Section 10.5. Opinions of Counsel...................................  62
       Section 10.6. Payment of Fees.......................................  62
       Section 10.7. Validity of Liens.....................................  62
       Section 10.8. Survey................................................  63
       Section 10.9. Title Insurance; Title Exception Documents............  63
       Section 10.10. Leases...............................................  63
       Section 10.11. Estoppel and Attornment Agreements...................  63
       Section 10.12. Certificates of Insurance............................  63
       Section 10.13. Environmental Reports................................  63
       Section 10.14. Environmental Indemnity..............................  63
       Section 10.15. Appraisals...........................................  64
       Section 10.16. Inspecting Engineers' Reports........................  64
       Section 10.17. Initial Letters of Credit............................  64
       Section 10.18. UCC Lien Searches....................................  64
       Section 10.19. Formation Transactions Complete......................  64

<PAGE>

Section 11. CONDITIONS TO ALL BORROWINGS...................................  64
       Section 11.1. Representations True; No Event of Default; Compliance 
                        Certificate........................................  64
       Section 11.2. No Legal Impediment...................................  65
       Section 11.3. Governmental Regulation...............................  65
       Section 11.4. Proceedings and Documents.............................  65

Section 12. EVENTS OF DEFAULT; ACCELERATION; ETC...........................  65
       Section 12.1. Events of Default and Acceleration....................  65
       Section 12.2. Termination of Commitments; Drawing of IRB Letters of 
                        Credit.............................................  68
       Section 12.3. Remedies..............................................  68
       Section 12.4. Distribution of Collateral Proceeds...................  69
       Section 12.5. Addition of Real Estate Assets to Cure Default........  69

Section 13. SETOFF.........................................................  70

Section 14. THE AGENT......................................................  71
       Section 14.1. Authorization.........................................  71
       Section 14.2. Employees and Agents..................................  71
       Section 14.3. No Liability..........................................  71
       Section 14.4. No Representations....................................  71
       Section 14.5. Payments..............................................  72
       Section 14.6. Holders of Notes......................................  73
       Section 14.7. Indemnity.............................................  73
       Section 14.8. Agent as Lender ......................................  73
       Section 14.9. Resignation...........................................  73
       Section 14.10. Notification of Defaults and Events of Default.......  74
       Section 14.11. Duties in the Case of Enforcement....................  74

Section 15. EXPENSES.......................................................  74

Section 16. INDEMNIFICATION................................................  75

Section 17. SURVIVAL OF COVENANTS, ETC.....................................  76

Section 18. ASSIGNMENT; PARTICIPATIONS; ETC................................  77
       Section 18.1. Conditions to ASection gnment by Lenders..............  77
       Section 18.2. Certain Representations and Warranties; Limitations; 
                        Covenants..........................................  77
       Section 18.3. Register..............................................  78
       Section 18.4. New Notes.............................................  78
       Section 18.5. Participations........................................  79
       Section 18.6. Pledge by Lender......................................  79
       Section 18.7. No Assignment by Borrower.............................  79
       Section 18.8. Disclosure............................................  80

<PAGE>

Section 19. NOTICES, ETC...................................................  80

Section 20. GOVERNING LAW; CONSENT TO JURISDICTION AND SERVICE.............  80

Section 21. HEADINGS.......................................................  81

Section 22. COUNTERPARTS...................................................  81

Section 23. ENTIRE AGREEMENT...............................................  81

Section 24. WAIVER OF JURY TRIAL AND CERTAIN DAMAGE CLAIMS.................  81

Section 25. CONSENTS, AMENDMENTS, WAIVERS, ETC.............................  82

Section 26. SEVERABILITY...................................................  82

Section 27. ACKNOWLEDGMENTS................................................  82

Section 28. PARTNER LIABILITY..............................................  83


Exhibit A             Form of Note
Exhibit B             Form of Loan Request
Exhibit C             Form of Compliance Certificate
Exhibit D             Form of Letter of Credit Request
Exhibit E             Opinion Requirements
Exhibit F             Form of Assignment and Acceptance

Schedule 1            Lenders; Domestic and Eurodollar Lending Offices
Schedule 1.1          Mortgaged Properties
Schedule 1.2          Commitments and Commitment Percentages
Schedule 1.3          Related Companies, Guarantor Subsidiaries and Permitted 
                      Joint Ventures
Schedule 1.4          Initial Letters of Credit
Schedule 5.3(b)       Required Additional Properties
Schedule 6.3          Title to Properties
Schedule 6.7          Litigation
Schedule 6.18         Environmental Reports
Schedule 6.22(d)      Engineering Reports
Schedule 6.22(l)      Rent Rolls
Schedule 6.22(m)      Service Agreements
Schedule 6.22(n)      Other Material Agreements
Schedule 8.3(d)       Investments

<PAGE>

                               CREDIT AGREEMENT


     This CREDIT AGREEMENT is made as of the 17th day of November, 1997, by 
and among PRIME GROUP REALTY, L.P., a Delaware limited partnership (the 
"Borrower"), PRIME GROUP REALTY TRUST, a Maryland trust (the "Company") and 
BANKBOSTON, N.A., a national banking association ("BankBoston"), PRUDENTIAL 
SECURITIES CREDIT CORPORATION, a Delaware corporation ("Prudential"), the 
other lending institutions which are from time to time listed on Schedule 1, 
(collectively, with BankBoston and Prudential, the "Lenders") and BANKBOSTON, 
N.A., as agent for itself and such other lending institutions (the "Agent").

     WHEREAS, the Borrower has requested and BankBoston and Prudential have 
agreed to provide a revolving credit facility, and to attempt to syndicate 
such facility to other lending institutions, and Borrower has agreed to 
provide real 0property collateral and other collateral to BankBoston, 
Prudential and such other lending institutions, as set forth herein;

     NOW, THEREFORE, to accomplish these purposes, the Agent, the Borrower 
and the Lenders hereby agree as follows:

Section 1. DEFINITIONS AND RULES OF INTERPRETATION

     Section 1.1. Definitions. The following terms shall have the meanings 
set forth in this Section l or elsewhere in the provisions of this Agreement 
referred to below:

     Additional Properties. Real Estate Assets which hereafter become 
Mortgaged Properties pursuant to Section 5.3.

     Affiliated Lenders. Any commercial bank or other commercial lender which 
is (i) the parent corporation of any of the Lenders, (ii) a wholly-owned 
subsidiary of any of the Lenders or (iii) a wholly-owned subsidiary of the 
parent corporation of any of the Lenders.

     Agent. BankBoston, N.A. acting as agent for the Lenders or any successor 
agent.

     Agent's Head Office. The Agent's head office located at 100 Federal 
Street, Boston, Massachusetts 02110, or at such other location as the Agent 
may designate from time to time in writing to the Borrower.

     Agreement. This Credit Agreement, including the Schedules and Exhibits 
hereto.

     Applicable Margin. As of any date of determination:

     (i) 1.20%, if Total Liabilities are less than 30% of Total Adjusted 
Assets, or

<PAGE>

     (ii) 1.35%, if Total Liabilities are equal to or less than 45% of Total 
Adjusted Assets but the condition set forth in clause (i) of this definition 
is not satisfied,

     (iii) 1.50% if Total Liabilities exceed 45% of Total Adjusted Assets.

Any change in the Applicable Margin caused by a change in the ratio of Total 
Liabilities to Total Adjusted Assets shall become effective on the 46th day 
following the end of the fiscal quarter at which such ratio was computed as 
shown on a Compliance Certificate which reflects such change in said ratio 
above or below the 30% level or the 45% level.

     Appraisals. Appraisals of the value of the Mortgaged Properties 
determined on an "as is" market value basis, prepared in writing 
independently and impartially by qualified MAI appraisers selected and 
retained by the Agent and paid for by Borrower, the form and substance of 
such appraisals and final determination of market value of the Mortgaged 
Properties thereunder to be reviewed and subject to approval by the Lead 
Lenders based on their respective reviews of such appraisals pursuant to 
their internal appraisal review policies and procedures. All appraisals shall 
be prepared in accordance with the Uniform Standards of Professional 
Appraisal Practice, Supplemental Standards Applicable To Federally Related 
Transactions, as further described in Title XI of the "Financial Institutions 
Reform, Recovery and Enforcement Act of 1989" ("FIRREA"), and any additional 
standards and conditions required for appraisals prepared for the Lead 
Lenders.

     Appraised Value. The market value of each of the Mortgaged Properties, 
determined by the Lead Lenders based upon the most recent Appraisals obtained 
pursuant to Section 5.4(b), Section 7.12 or Section 10.14. In determining 
Appraised Value the Lead Lenders shall exclude any value associated with any 
unimproved land or unoccupied Buildings located on the applicable Mortgaged 
Property.

     Assignment and Acceptance. See Section 18.

     Assignments of Leases and Rents. The assignments of rents and leases 
from the Mortgagor to the Agent pursuant to which the Mortgagor shall grant 
and assign to the Agent as agent for the Lenders a security interest in and 
assignment of the Mortgagor's interest as lessor with respect to all Leases 
and rents thereunder of all or any part of the Mortgaged Properties as 
security for the Obligations.

     BankBoston. As defined in the preamble hereto.

     Borrowing Base Value. With respect to each Mortgaged Property, an amount 
equal to (i) two times the Net Operating Income for the most recently 
completed two fiscal quarters, minus the Reserve Amount for such Mortgaged 
Property, divided by (ii) a capitalization rate equal to 0.09 for the West 
Wacker Drive Property or 0.10 for any other Mortgaged Property.

                                        2
<PAGE>

     Base Rate. The higher of (a) the annual rate of interest announced from 
time to time by BankBoston at the Agent's Head Office as its "base rate", and 
(b) one half of one percent (1/2%) above the overnight federal funds 
effective rate as published by the Board of Governors of the Federal Reserve 
System, as in effect from time to time.

     Base Rate Loans. Those Loans bearing interest calculated by reference to 
the Base Rate.

     Borrower. As defined in the preamble hereto.

     Borrowing Date. The date on which any Loan is made or is to be made, and 
the date on which any Loan is converted or continued in accordance with 
Section 2.6.

     Buildings. The buildings, structures and other improvements now or 
hereafter located on the Mortgaged Properties.

     Building Service Equipment. All apparatus, fixtures and articles of 
personal property owned by the Mortgagor now or hereafter attached to or used 
or procured for use in connection with the operation or maintenance of any 
Building located on or included in the Mortgaged Properties, including, but 
without limiting the generality of the foregoing, all engines, furnaces, 
boilers, stokers, pumps, heaters, tanks, dynamos, motors, generators, 
switchboards, electrical equipment, heating, plumbing, lifting and 
ventilating apparatus, air-cooling and air-conditioning apparatus, gas and 
electric fixtures, elevators, escalators, fittings, and machinery and all 
other equipment of every kind and description, used or procured for use in 
the operation of the Buildings (except apparatus, fixtures or articles of 
personal property belonging to lessees or other occupants of such building or 
to persons other than the Mortgagor unless the same be abandoned by any such 
lessee or other occupant or person), together with any and all replacements 
thereof and additions thereto.

     Business Day. Any day on which banking institutions in Boston, 
Massachusetts and Chicago, Illinois are open for the transaction of banking 
business and, in the case of Eurodollar Rate Loans, also a day which is a 
Eurodollar Business Day.

     Capitalized Leases. Leases under which the Borrower is the lessee or 
obligor, the discounted future rental payment obligations under which are 
required to be capitalized on the balance sheet of the Borrower in accordance 
with generally accepted accounting principles.

     CERCLA. See Section 6.18.

     Closing Balance Sheet. The pro-forma consolidated balance sheet of the 
Company dated June 30, 1997 and reflecting the closing of the Formation 
Transactions contained in the Prospectus Financial Statements and the related 
notes thereto.

                                       3
<PAGE>

     Code. The Internal Revenue Code of 1986, as amended and in effect from 
time to time.

     Collateral. All of the properties of the Borrower or of any Guarantor 
that are or are intended to be subject to the security interests, liens and 
mortgages created by the Security Documents, including, without limitation, 
the Mortgaged Properties, the Leases, the Permits and the Service Agreements.

     Collateral Value. With respect to each Mortgaged Property an amount 
equal to the lesser of its Appraised Value or its Borrowing Base Value.

     Commitment. With respect to each Lender, the amount set forth from time 
to time on Schedule 1.2 hereto as the amount of such Lender 's commitment to 
make Loans to the Borrower.

     Commitment Percentage. With respect to each Lender , the percentage set 
forth from time to time on Schedule 1.2 hereto as such Lender 's percentage 
of the Total Commitment.

     Common Shares. All common shares of beneficial interest of the Company, 
including, without limitation, those offered pursuant to the Equity 
Prospectus.

     Common Units. Partnership interests representing the common equity in 
the Borrower which interests are not subject to any mandatory redemption or 
entitled to any distributions other than distributions based on the dividends 
paid on the Common Shares.

     Company. As defined in the preamble hereto.

     Conversion Request. A notice given by the Borrower to the Agent of its 
election to convert or continue a Loan in accordance with Section 2.6.

     Default. See Section 12.1.

     Delinquent Lender. See Section 14.5(c).

     Distribution. The declaration or payment of any dividend or distribution 
of cash or cash equivalents to the holders of any of the Equity Interests, or 
any distribution or payment to any officer, employee or director of the 
Borrower or the Company, other than reasonable employee compensation.

     Dollars or $. Dollars in lawful currency of the United States of America.

                                       4
<PAGE>

     Domestic Lending Office. Initially, the office of each Lender designated 
as such in Schedule 1 hereto; thereafter, such other office of such Lender, 
if any, located within the United States that will be making or maintaining 
Base Rate Loans.

     Drawing. The drawing of any Letter of Credit by the beneficiary thereof 
which is paid by the Agent pursuant thereto.

     Drawing Date. The date on which a draft under a Letter of Credit is paid 
by the Agent.

     EBITDA. The Borrower's earnings before interest, taxes, depreciation and 
amortization, as determined on a consolidated basis in accordance with 
Generally Accepted Accounting Principles, except that rental income shall be 
determined on a cash basis.

     Effective Date. The date upon which this Agreement shall become 
effective pursuant to Section 10.

     Eligible Assignee. Any of (a) a commercial bank organized under the laws 
of the United States, or any State thereof or the District of Columbia, and 
having total assets in excess of $1,000,000,000; (b) a savings and loan 
association or savings bank organized under the laws of the United States, or 
any State thereof or the District of Columbia, and having a net worth of at 
least $100,000,000, calculated in accordance with generally accepted 
accounting principles; (c) a commercial bank organized under the laws of any 
other country which is a member of the Organization for Economic Cooperation 
and Development (the "OECD"), and having total assets in excess of 
$1,000,000,000, provided that such bank is acting through a branch or agency 
located in the country in which it is organized or another country which is 
also a member of the OECD; and (d) the central bank of any country which is a 
member of the OECD. Notwithstanding anything to the contrary, the term 
Eligible Assignee shall exclude any Person controlling, controlled by or 
under common control with, the Borrower or the Company.

     Employee Benefit Plan. Any employee benefit plan within the meaning of 
Section 3 (3) of ERISA maintained or contributed to by the Borrower or any 
ERISA Affiliate, other than a Multiemployer Plan.

     Environmental Laws. See Section 6.18(a).

     Environmental Reports. Reports addressed to the Agent (or addressed to 
the Borrower with an acceptable reliance letter addressed to the Agent) 
prepared by environmental engineering firms reasonably acceptable to the Lead 
Lenders relating to environmental site assessments and other evaluations of 
environmental conditions which may have been conducted with respect to the 
Mortgaged Properties described in Schedule 6.18 hereto and conducted with 
respect to prospective Additional Properties pursuant to Section 5.3.

                                       5
<PAGE>

     Equity Interests. Collectively, all equity ownership interests in the 
Borrower or the Company including, without limitation, the Common Shares, the 
Preferred Shares, the Common Units and the Preferred Units.

     Equity Prospectus. The prospectus dated November 12, 1997 relating to 
12,380,000 Common Shares included in the Registration Statement (No. 
333-33547) of the Company on Form S-11 as filed with the Securities Exchange 
Commission on August 13, 1997, as amended, as the same has been or may be 
further amended or supplemented from time to time.

     ERISA. The Employee Retirement Income Security Act of 1974, as amended 
and in effect from time to time.

     ERISA Affiliate. Any Person which is treated as a single employer with 
the Borrower under Section 414 of the Code.

     ERISA Reportable Event. A reportable event with respect to a Guaranteed 
Pension Plan within the meaning of Section 4043 of ERISA and the regulations 
promulgated thereunder as to which the requirement of notice has not been 
waived.

     Eurocurrency Reserve Rate. For any day with respect to a Eurodollar Rate 
Loan, the maximum rate (expressed as a decimal) at which any of the Lenders 
would be required to maintain reserves under Regulation D of the Board of 
Governors of the Federal Reserve System (or any successor or similar 
regulations relating to such reserve requirements) against "Eurocurrency 
Liabilities" (as that term is used in Regulation D) , if such liabilities 
were outstanding. The Eurocurrency Reserve Rate shall be adjusted 
automatically on and as of the effective date of any change in the 
Eurocurrency Reserve Rate and the Agent shall provide the Borrower with 
prompt written notice of any such change.

     Eurodollar Business Day. Any day on which commercial banks are open for 
international business (including dealings in Dollar deposits) in London or 
such other eurodollar interbank market as may be selected by the Agent in its 
sole discretion acting in good faith.

     Eurodollar Lending Office. Initially, the office of each Lender 
designated as such in Schedule 1 hereto; thereafter, such other office of 
such Lender, if any, that shall be making or maintaining Eurodollar Rate 
Loans.

     Eurodollar Rate. For any Interest Period with respect to a Eurodollar Rate
Loan, the rate per annum equal to the quotient (rounded upwards to the nearest
1/16 of one percent) of (a) the rate at which the Agent is offered Dollar
deposits two Eurodollar Business Days prior to the beginning of such Interest
Period in an interbank eurodollar market where the eurodollar and foreign
currency and exchange operations of the Agent are customarily conducted, for
delivery on the first day of such Interest Period, for the number of days
comprised therein and in an 

                                       6
<PAGE>


amount comparable to the amount of the Eurodollar Rate Loan to which such 
Interest Period applies, divided by (b) a number equal to 1.00 minus the 
Eurocurrency Reserve Rate.

     Eurodollar Rate Loans. Loans bearing interest calculated by reference to 
the Eurodollar Rate.

     Event of Default. See Section 12.1.

     Fixed Charges. With respect to any fiscal period of the Borrower, an 
amount determined on a consolidated basis equal to the sum of (i) Interest 
Expense, (ii) regularly scheduled installments of principal payable with 
respect to all Indebtedness of Borrower, (iii) Indebtedness which matured 
during such fiscal period and was not refinanced with replacement 
Indebtedness plus (iv) all Distributions paid during such period to the 
holders of any Preferred Shares or Preferred Units.

     Fixed Rate Prepayment Fee. See Section 3.3.

     Formation Transactions. The transactions described in the Equity 
Prospectus to be consummated on or before the Effective Date pursuant to 
which (i) the Common Shares will be sold pursuant to an initial public 
offering of such Common Shares and certain Preferred Shares, Common Units and 
Preferred Units will be sold or issued in exchange for the contribution of 
properties; (ii) the net proceeds thereof received by the Company will be 
contributed as capital to the Borrower; (iii) the Borrower will directly or 
indirectly acquire all assets reflected on the Closing Balance Sheet, and 
(iv) certain Indebtedness secured by Liens on the Mortgaged Properties or 
other Real Estate Assets will be repaid and such Liens discharged.

     Funds From Operations. With respect to any fiscal period of the 
Borrower, an amount equal to the Borrower's Funds From Operations determined 
in accordance with the definition approved by the National Association of 
Real Estate Investment Trusts, except that rental income shall be determined 
on a cash basis.

     Generally Accepted Accounting Principles. Principles that are (a) 
consistent with the principles promulgated or adopted by the Financial 
Accounting Standards Board and its predecessors, as in effect from time to 
time and (b) consistently applied with past financial statements of the 
Borrower adopting the same principles and with the Prospectus Financial 
Statements.

     Guaranteed Pension Plan. Any employee pension benefit plan within the 
meaning of Section 3(2) of ERISA maintained or contributed to by the Borrower 
or any ERISA Affiliate the benefits of which are guaranteed on termination in 
full or in part by the PBGC pursuant to Title IV of ERISA, other than a 
Multiemployer Plan.

                                       8
<PAGE>

     Guarantor. Each of the Guarantor Subsidiaries.

     Guarantor Subsidiaries. The partnerships, limited liability companies 
and corporations designated as Guarantor Subsidiaries on Schedule 1.3 hereto 
and any other partnerships, limited liability companies or corporations 
hereafter approved by the Requisite Lenders which are at least 99% owned by 
Borrower and which execute and deliver a Guaranty.

     Guaranty. The Unconditional Guaranty of Payment and Performance from 
each Guarantor to the Agent pursuant to which such Guarantor has guaranteed 
the Obligations.

     Hazardous Materials. See Section 6.18(b).

     Indebtedness. All obligations, contingent and otherwise, that in 
accordance with Generally Accepted Accounting Principles should be classified 
upon the obligor's balance sheet as liabilities, or to which reference should 
be made by footnotes thereto, including in any event the following whether or 
not so classified: (a) the Obligations, (b) all debt and similar monetary 
obligations for borrowed money, whether direct or indirect; (c) all 
liabilities secured by any mortgage, pledge, negative pledge, security 
interest, lien, negative lien, charge, or other encumbrance existing on 
property owned or acquired subject thereto, whether or not the liability 
secured thereby shall have been assumed; (d) all guarantees, endorsements and 
other contingent obligations whether direct or indirect in respect of 
indebtedness or obligations of others, including any obligation to supply 
funds to or in any manner to invest in, directly or indirectly, the debtor, 
to purchase indebtedness, or to assure the owner of indebtedness against 
loss, through a master lease transaction or an agreement to purchase goods, 
supplies, or services for the purpose of enabling the debtor to make payment 
of the indebtedness held by such owner or otherwise, and the obligations to 
reimburse the issuer in respect of any letters of credit; and (e) joint 
venture and partnership obligations, contingent or otherwise of the type set 
forth in (a) through (d) above. Indebtedness shall not be deemed to include 
obligations under a purchase and sale agreement or contribution agreement for 
the acquisition of assets by Borrower or the Related Companies unless entered 
into for the purpose of supporting the Indebtedness of the seller or 
contributor.

     Indemnity Agreement. The Indemnity Agreement regarding Hazardous 
Materials from the Borrower and the Company with respect to the Mortgaged 
Properties, and any similar agreements which may be executed with respect to 
Additional Properties.

     Initial Letters of Credit. The Letters of Credit described on Schedule 
1.4 hereto.

     Interest Expense. With respect to any fiscal period of the Borrower, an 
amount equal to the sum of the following with respect to all Indebtedness of 
the Borrower and the Related Companies: (i) total interest expense, accrued 
in accordance with Generally Accepted 

                                       8
<PAGE>

Accounting Principles plus (ii) all capitalized interest determined in 
accordance with Generally Accepted Accounting Principles, plus (iii) the 
amortization of deferred financing costs.

     Interest Payment Date. As to any Base Rate Loan or Eurodollar Rate Loan, 
the first day of each calendar month.

     Interest Period. With respect to each Loan, (a) initially, the period 
commencing on the Borrowing Date of such Loan and ending on the last day of 
one of the periods set forth below, as selected by the Borrower in a Loan 
Request (i) for any Base Rate Loan, the last day of the calendar month; and 
(ii) for any Eurodollar Rate Loan, 1, 2 or 3 months; and (b) thereafter, each 
period commencing on the last day of the next preceding Interest Period 
applicable to such Loan and ending on the last day of one of the periods set 
forth above, as selected by the Borrower in a Conversion Request; provided 
that all of the foregoing provisions relating to Interest Periods are subject 
to the following:

          (A) if any Interest Period with respect to a Eurodollar Rate Loan 
would otherwise end on a day that is not a Eurodollar Business Day, that 
Interest Period shall be extended to the next succeeding Eurodollar Business 
Day unless the result of such extension would be to carry such Interest 
Period into another calendar month, in which event such Interest Period shall 
end on the immediately preceding Eurodollar Business Day;

          (B) if any Interest Period with respect to a Base Rate Loan would 
end on a day that is not a Business Day, that Interest Period shall end on 
the next succeeding Business Day;

          (C) if the Borrower shall fail to give notice as provided in 
Section 2.6, the Borrower shall be deemed to have requested a conversion of 
the affected Eurodollar Rate Loan to a Base Rate Loan on the last day of the 
then current Interest Period with respect thereto;

          (D) any Interest Period relating to any Eurodollar Rate Loan that 
begins on the last Eurodollar Business Day of a calendar month (or on a day 
for which there is no numerically corresponding day in the calendar month at 
the end of such Interest Period) shall end on the last Eurodollar Business 
Day of a calendar month; and

          (E) the Borrower may not select any Interest Period relating to any 
Eurodollar Rate Loan that would extend beyond the Maturity Date.

     Interest Rate Contracts. Interest rate swaps, caps or similar agreements 
providing for interest rate protection.

     Investments. All expenditures made and all liabilities incurred 
(contingently or otherwise) for the acquisition of stock, partnership or 
membership interests or Indebtedness of, or for loans, advances, capital 
contributions or transfers of property to, or in respect of any 

                                       9
<PAGE>

guaranties (or other commitments as described under Indebtedness), or 
obligations of, any Person or for the acquisition of real property or other 
assets. In determining the aggregate amount of Investments outstanding at any 
particular time Investments shall be counted at their acquisition cost, 
including the value of any Equity Interests issued in exchange for the 
contribution of property, subject to the following: (a) the amount of any 
Investment represented by a guaranty shall be taken at not less than the 
principal amount of the obligations guaranteed and still outstanding; (b) 
there shall be included as an Investment all interest accrued with respect to 
Indebtedness constituting an Investment unless and until such interest is 
paid; (c) there shall be deducted in respect of each such Investment any 
amount received as a return of capital (but only by repurchase, redemption, 
retirement, repayment, liquidating dividend or liquidating distribution) ; 
(d) there shall not be deducted in respect of any Investment any amounts 
received as earnings on such Investment, whether as dividends, interest or 
otherwise, except that accrued interest included as provided in the foregoing 
clause (b) may be deducted when paid; and (e) there shall not be deducted 
from the aggregate amount of Investments any decrease in the value thereof.

     IRB Documents. The Indentures of Trust, Financing Agreements, Loan 
Agreements, Bonds, Notes and other documents relating to the IRB Indebtedness.

     IRB Indebtedness. The Indebtedness of certain of the Guarantor 
Subsidiaries with respect to fourteen (14) issues of industrial development 
bonds, the proceeds of which were used to acquire or develop certain of the 
Additional Properties listed on Schedule 5.3(b), excluding the Indebtedness 
of certain Guarantor Subsidiaries with respect to such Properties in 
Arlington Heights, Illinois for so long as the bonds relating thereto are 
held by the Borrower or a Related Company.

     IRB Indebtedness Account. A deposit account established by the Borrower 
with the Agent into which the Borrower will deposit funds as required by 
Section 2.8 and which the Agent will debit to reimburse the amount of 
Drawings paid under the IRB Letters of Credit.

     IRB Letters of Credit. The Letters of Credit issued with respect to the 
IRB Indebtedness for the benefit of the respective trustees named in the IRB 
Documents and the Letter of Credit expiring on or before April 15, 1998 for 
the benefit of Credit Suisse First Boston, which is the issuer of certain 
prior letters of credit relating to certain of the IRB Indebtedness.

     Lead Lenders. BankBoston and Prudential. If a Lead Lender shall enter 
into one or more assignments pursuant to Section 18 which have the effect of 
reducing the Commitment of such Lender to less than $20,000,000 (which number 
will be proportionately reduced in the event of any reduction in the Total 
Commitment pursuant to Section 2.2), then such Lender shall no longer be a 
Lead Lender. If by virtue of this immediately preceding sentence there are no 
longer any Lead Lenders, then all approvals, consents and other matters which 
require the action by the Lead Lenders hereunder shall thereafter require the 
specified action by the Requisite Lenders.

                                       10
<PAGE>

     Leases. Leases, licenses and agreements whether written or oral, 
relating to the use or occupation of space in or on the Buildings or on the 
Mortgaged Properties by persons other than Mortgagor, including but not 
limited to the leases listed on Schedule 6.22(1).

     Lenders. BankBoston, Prudential and the other lending institutions 
listed from time to time on Schedule 1 hereto and any other Person who 
becomes an assignee of any rights of a Lender pursuant to Section 18 or a 
Person who acquires all or substantially all of the stock or assets of a 
Lender .

     Letter of Credit. A letter of credit which is one of the Initial Letters 
of Credit or is hereafter issued by the Agent for the account of the Borrower 
pursuant to Section  2.9.

     Letter of Credit Request. See Section  2.9.

     Lien. Any lien, encumbrance, mortgage, deed of trust, pledge, 
restriction or other security interest. If title to any Real Estate Asset is 
held by a Subsidiary of Borrower then any pledge or assignment of Borrower's 
stock, partnership interest, limited liability company interest or other 
ownership interest in such Subsidiary shall be deemed to be a Lien on the 
Real Estate Assets owned by such Subsidiary.

     Loan Documents. This Agreement, the Notes, the Guaranties, the Security 
Documents, the Indemnity Agreement and any and all other agreements, 
documents and instruments now or hereafter evidencing, securing or otherwise 
relating to the Loans or the Letters of Credit.

     Loan Request. See Section 2.5.

     Loans. Loans made or to be made by the Lenders to the Borrower pursuant 
to Section 2.

     Major Lease. A Lease of (i) 100,000 square feet or more of the gross 
leasable area of a Building which is used primarily for industrial or 
warehouse purposes or (ii) 25,000 square feet or more of the gross leasable 
area of a Building which is used primarily for office purposes, and any 
guaranty of the tenant's obligations under any such Lease.

     Major Tenants. As to any Major Lease, those tenants that are parties to 
that Major Lease and any guarantors of those tenants' obligations thereunder.

     Material Adverse Effect. A material adverse effect on (i) any of the 
Mortgaged Properties, (ii) the business, results of operations or financial 
condition of the Borrower and the Related Companies taken as a whole, (iii) 
the ability of the Borrower, the Company or any Guarantor to perform its 
obligations under the Loan Documents, or (iv) the validity or enforceability 
of any of the Loan Documents or the remedies or material rights of the Agent 
or the Lenders thereunder. 

                                       11
<PAGE>

     Maturity Date. November 17, 2000, or such earlier date on which the 
Loans shall become due and payable pursuant to the terms hereof.

     Maximum Principal Amount. Maximum Principal Amount shall mean the least 
of the following: (i) the maximum Outstanding Principal Amount which may 
exist without causing a violation of Section 9.1; (ii) the maximum 
Outstanding Principal Amount which may exist without causing a violation of 
Section 9.2; and (iii) the Total Commitment.

     Mortgaged Properties. The (a) Real Estate Assets described on Schedule 
1.1 hereto and such other Real Estate Assets which may be subsequently 
conveyed to the Agent as Additional Properties to secure the Obligations in 
accordance with Section 5.3 hereof, excluding from the foregoing any Real 
Estate Assets which the Agent may release pursuant to Section 5.5 hereof, as 
such Real Estate Assets are more particularly described in the Security 
Deeds; (b) the Buildings and Building Service Equipment located thereon and 
(to the extent assignable) all Permits relating thereto; and (c) all other 
property incident to any of same described in any Security Document or other 
Loan Document.

     Mortgagor. With respect to each of the Mortgaged Properties, the owner 
thereof.

     Multiemployer Plan. Any multiemployer plan within the meaning of Section 
3(37) of ERISA maintained or contributed to by the Borrower or any ERISA 
Affiliate.

     Net Offering Proceeds. All net cash proceeds received after the date 
hereof by the Borrower or the Company as a result of the sale of common, 
preferred or other classes of stock of the Company or the issuance of limited 
partnership interests in the Borrower after deducting customary costs and 
discounts of issuance paid by Company or Borrower in connection therewith.

     Net Operating Income. With respect to any fiscal period of the Borrower 
and with respect to any one or more of the Real Estate Assets, the total 
rental and other operating income from the operation of such Real Estate 
Assets after deducting all expenses and other proper charges incurred by the 
Borrower in connection with the operation of the Mortgaged Properties during 
such fiscal period, including, without limitation, real estate taxes, bad 
debt expenses and management fees (which fees shall not be lower than the 
market rate for management fees for similar properties in the same general 
location and such management fees shall be deducted when computing Net 
Operating Income without regard to the extent to which such management fees 
are passed through to the tenants), but before payment or provision for Fixed 
Charges, income taxes, and depreciation, amortization, and other non-cash 
expenses, all as determined in accordance with Generally Accepted Accounting 
Principles except that (a) rental income will be determined on a cash basis, 
provided, however, that each payment of prepaid rent shall be allocated to 
the period for which it applies, (b) adjustments will be made so that each 
fiscal 

                                       12
<PAGE>

quarter will include one quarter of annual real estate tax and insurance 
expenses, and (c) any non-recurring income or income not directly from the 
operation of such Real Estate Asset, such as interest income, shall be 
excluded.

     Notes. See Section 2.3.

     Obligations. All indebtedness, obligations and liabilities of the 
Borrower or any Guarantor to any of the Lenders and the Agent, individually 
or collectively, under this Agreement or any of the other Loan Documents or 
in respect of any of the Loans, the Letters of Credit or the Notes or other 
instruments at any time evidencing any thereof, whether existing on the date 
of this Agreement or arising or incurred hereafter, direct or indirect, joint 
or several, absolute or contingent, matured or unmatured, liquidated or 
unliquidated, secured or unsecured, arising by contract, operation of law of 
otherwise.

     Outstanding Principal Amount. The sum of (i) the aggregate amount of 
unpaid principal of the Loans as of any date of determination plus (ii) the 
aggregate face amount of each Letter of Credit issued under Section  2.9 
which has not expired or terminated prior to such date of determination, 
excluding from the face amount of any Letter of Credit the amount by which 
any Unreimbursed Drawing has reduced the availability thereunder until such 
availability is reinstated pursuant to the terms of such Letter of Credit.

     PBGC. The Pension Benefit Guaranty Corporation created by Section 4002 
of ERISA and any successor entity or entities having similar responsibilities.

     Permits. All governmental permits, licenses, and approvals necessary for 
the lawful operation and maintenance of the Mortgaged Properties.

     Permitted Acquisition. The acquisition by Borrower or any Related 
Company of Real Estate Assets which are located in the continental United 
States and are leased or intended to be leased primarily for industrial or 
office purposes.

     Permitted Joint Ventures. Any entity in which Borrower has any direct or 
indirect ownership interest, except the Company and the Related Companies and 
except Prime Group Realty Services, Inc., including general partnerships, 
corporations, trusts and limited liability companies, which own or propose to 
develop industrial or office properties provided that neither Borrower or any 
Guarantor shall have any recourse liability for the Indebtedness of such 
entity. Permitted Joint Ventures existing on the date hereof are set forth in 
Schedule 1.3.

     Permitted Developments. The construction of any new buildings or the 
construction of additions expanding existing buildings or the rehabilitation 
of the existing buildings (other than normal refurbishing and tenant fit up 
work when one tenant leases space previously occupied by another tenant) 
relating to any Real Estate Assets of the Borrower or any of the Related 

                                       13
<PAGE>

Companies and each Permitted Development shall be counted for purposes of 
Section 8.3 from the time of commencement of the applicable construction work 
until the later of (i) the date that leases for at least 70% of the gross 
leasable area of such project have been executed or (ii) the date that a 
final certificate of occupancy has been issued with respect to such project, 
in the amount of the total projected cost of such project.

     Permitted Liens. Liens, security interests and other encumbrances 
permitted by Section 8.2.

     Person. Any individual, corporation, partnership, trust, unincorporated 
association, business, or other legal entity, and any government or any 
governmental agency or political subdivision thereof.

     Pledge Agreements. The Pledge and Security Agreements between each 
Guarantor Subsidiary which is a borrower under any IRB Documents and the 
Agent pursuant to which certain bonds purchased with the proceeds of Drawings 
under the IRB Letters of Credit would be pledged to the Agent until such 
bonds are remarketed or redeemed.

     Pledged Bonds. Bonds pledged to the Agent pursuant to any Pledge 
Agreement.

     Preferred Shares. All Preferred Shares of beneficial interest of the 
Company including, without limitation, the 2,000,000 shares of Series A 
Cumulative Convertible Preferred Shares as described in the Equity Prospectus.

     Preferred Units. All partnership interests in the Borrower other than 
the Common Units, including, without limitation, the Preferred Units 
described in the Equity Prospectus.

     Prepayment Date. See Section 3.3.

     Prime. The Prime Group, Inc., an Illinois corporation.

     Pro Forma Debt Service Charges for the Mortgaged Properties. For any 
fiscal quarter of the Borrower, an amount equal to three monthly principal 
and interest payments based on a twenty-five (25) year mortgage style 
amortization schedule, calculated on the Pro Forma Principal Amount and an 
interest rate equal to the greater of (i) the then current weighted average 
interest rate per annum on the Loans or (ii) the then current ten (10) year 
U.S. Treasury bill yield plus 1.75% per annum.

     Pro Forma Principal Amount. (a) With respect to Compliance Certificates 
delivered pursuant to Section 7.4(e), the maximum Outstanding Principal 
Amount at any time during the applicable fiscal quarter; (b) with respect to 
Compliance Certificates delivered pursuant to Section 2.5(a), 2.9(b) or 
Section 11.1, the Outstanding Principal Amount after giving effect to the 
requested Loan or the issuance of the requested Letter of Credit; (c) with 
respect to Compliance 

                                       14
<PAGE>

Certificates delivered pursuant to Section 5.5(a) or Section 8.4(b), the 
Outstanding Principal Amount after giving effect to any proposed sale or 
transfer including any payments on the Loans or cancellation of Letters of 
Credit to be made in connection therewith.

     Properties. All Real Estate Assets, Real Estate, and all other assets, 
including, without limitation, intangibles and personalty owned by the 
Borrower.

     Prospectus Financial Statements. The Financial Statements relating to 
the Company and relating to certain properties to be acquired by the Borrower 
or its Subsidiaries in connection with the Formation Transactions as set 
forth in the Equity Prospectus.

     Prudential. As defined in the preamble thereto.

     Real Estate. All real property at any time owned, leased (as lessee or 
sublessee) or operated by the Borrower, any Guarantor, or any of the Related 
Companies or any Permitted Joint Venture.

     Real Estate Assets. Those fixed and tangible properties consisting of 
land, buildings and/or other improvements owned by the Borrower, by any 
Guarantor, by any of the Related Companies or by any Permitted Joint Venture 
at the relevant time of reference thereto, including without limitation, the 
Mortgaged Properties, but excluding all leaseholds other than leaseholds 
under ground leases having an unexpired term of at least 30 years.

     Record. The grid attached to any Note, or the continuation of such grid, 
or any other similar record, including computer records, maintained by any 
Lender with respect to any Loan referred to in such Note.

     Recourse Indebtedness. All Indebtedness except Indebtedness with respect 
to which recourse for payment is contractually limited (except for customary 
exclusions) to specific assets encumbered by a lien securing such 
Indebtedness.

     Register. See Section 18.3.

     Related Companies. The entities listed and described on Schedule 1.3 
hereto, or thereafter, any entity whose financial statements are consolidated 
or combined with the Borrower's pursuant to Generally Accepted Accounting 
Principles, or any ERISA Affiliate.

     Release. See Section 6.18(c)(iii).

     Requisite Lenders. As of any date, the Lenders whose aggregate 
Commitments constitute at least sixty-six percent (66%) of the Total 
Commitment provided that the Agent must always be among the Requisite Lenders 
(except that after an Event of Default all actions by the

                                       15
<PAGE>

Requisite Lenders with respect to acceleration of the Loans and the 
enforcement of the Loan Documents as provided in Section 12 and in Section 
14.11 shall be made without regard to whether the Agent is among the 
Requisite Lenders) and provided that the Commitments of any Delinquent 
Lenders shall be disregarded when determining the Requisite Lenders.

     Reserve Amount. With respect to any Real Estate Assets or group of Real 
Estate Assets, a normalized annual reserve for capital expenditures, tenant 
improvements, replacement reserves and leasing costs at the rate of $0.25 per 
year per square foot of gross leasable area contained in all buildings on 
such Real Estate Assets. When the Reserve Amount is used in computing an 
amount with respect to a fiscal period which is shorter than a year, said 
amount shall be appropriately prorated.

     Responsible Officer. With respect to the Company, any one of its Chief 
Executive Officer, Chief Financial Officer, Treasurer or Executive Vice 
Presidents.

     Security Deeds. The mortgages and deeds of trust from the Mortgagor to 
the Agent pursuant to which the Mortgagor shall convey the Mortgaged 
Properties as security for the Obligations.

     Security Documents. The Security Deeds, the Assignments of Leases and 
Rents, the Pledge Agreements and the UCC-1 financing statements.

     Service Agreements. All service agreements between the Borrower and 
third parties, whether written or oral, relating to the operation, 
maintenance, security, finance or insurance of the Mortgaged Properties.

     Subsidiary. Any corporation, partnership, limited liability company, 
association, trust, or other business entity of which the designated parent 
or other controlling Person shall at any time own directly or indirectly 
through a Subsidiary or Subsidiaries at least a majority (by number of votes) 
of the outstanding Voting Interests.

     Surveys. Instrument surveys of the Mortgaged Properties dated or updated 
to a date not more than six (6) months prior to the date the applicable 
property becomes a Mortgaged Property hereunder, which shall show the 
location of all Buildings, easements and utility lines on the Mortgaged 
Properties, shall be sufficient to remove the survey exception from the Title 
Policy, shall show that all Buildings are within the lot lines of the 
Mortgaged Properties, shall not show any material encroachments by others, 
and shall show whether or not the Mortgaged Properties are located in any 
flood hazard district as established by the Federal Emergency Management 
Agency or any successor agency or are located in any flood plain, flood 
hazard or wetland protection district established under federal, state or 
local law and in addition shall meet the then applicable standards of the 
Agent.

                                       16
<PAGE>

     Tangible Net Worth. Total Assets minus Total Liabilities minus all 
intangibles determined in accordance with Generally Accepted Accounting 
Principles.

     Title Insurance Company. Chicago Title Insurance Company.

     Title Policy. For each Mortgaged Property an ALTA standard form title 
insurance policy issued by the Title Insurance Company (with such reinsurance 
or co-insurance as the Agent may require, any such reinsurance to be with 
direct access endorsements) insuring the priority of the Security Deed and 
Assignment of Leases and Rents and that the Mortgagor holds good and clear 
record marketable fee simple title to the Mortgaged Property, subject only to 
the encumbrances permitted by the Security Deed and which shall not contain 
exceptions for mechanics liens, persons in occupancy (other than Leases 
listed on Schedule 6.22(1)) or matters which would be shown by a survey 
(other than matters approved by the Agent in its reasonable discretion), 
shall not insure over any matter except to the extent that any such 
affirmative insurance is acceptable to the Agent in its sole discretion 
(after consultation with the Lead Lenders), and shall contain such 
endorsements and affirmative insurance as the Agent in its reasonable 
discretion may require, including but not limited to (a) comprehensive 
endorsement, (b) variable rate of interest endorsement, (c) usury 
endorsement, (d) revolving credit endorsement, (e) doing business 
endorsement, (f) ALTA form 3.1 zoning endorsement, with parking, (g) survey 
(same-as) endorsement (h) access endorsement, (i) tie-in endorsement, (j) 
first loss endorsement, and (k) tax parcel endorsement, to the extent that 
such endorsements are available in the state where the applicable Mortgaged 
Property is located.

     Total Adjusted Assets. The sum of (i) the assets classified as cash or 
cash equivalents on the consolidated balance sheet of Borrower prepared in 
accordance with Generally Accepted Accounting Principles as of the end of the 
most recent fiscal quarter (including any restricted cash other than tenant 
deposits), plus (ii) the product of (a) EBITDA for the most recent two fiscal 
quarters, times (b) two, divided by (c) 0.0975. To the extent necessary 
EBITDA used to compute Total Adjusted Assets will be computed on a pro forma 
basis as though the Formation Transactions had closed, and the Effective Date 
had been, as of the first day of the applicable period of two fiscal quarters.

     Total Assets. The aggregate book value of all assets of the Borrower and 
the Related Companies consolidated and determined in accordance with 
Generally Accepted Accounting Principles plus accumulated depreciation and 
amortization related to Real Estate Assets.

     Total Commitment. The sum of the Commitments of the Lenders, as in 
effect from time to time.

     Total Liabilities. The sum of the following (without duplication): (i) 
all liabilities of the Borrower and the Related Companies consolidated and 
determined in accordance with Generally Accepted Accounting Principles 
excluding accounts payable incurred in the ordinary course of

                                       17
<PAGE>

business, (ii) all Indebtedness of the Borrower and the Related Companies 
whether or not so classified, including, without limitation, all outstanding 
Loans under this Agreement, and (iii) the balance available for drawing under 
letters of credit issued for the account of the Borrower or any of the 
Related Companies.

     Total Operating Cash Flow. With respect to any fiscal period of the 
Borrower (i) EBITDA minus (ii) the Reserve Amount with respect to all Real 
Estate Assets owned by the Borrower or any of the Related Companies.

     Type. As to any Loan its nature as a Base Rate Loan or a Eurodollar Rate 
Loan.

     Unreimbursed Drawing. Any Drawing other than a Drawing which is 
reimbursed by the Agent debiting the IRB Indebtedness Account pursuant to 
Section 2.8. If any reimbursement from the IRB Indebtedness Account or any 
part thereof is rescinded or must otherwise be restored or returned by the 
Agent upon the insolvency, bankruptcy or reorganization of the Borrower or 
any Guarantor, the Drawing reimbursed thereby shall be deemed to be an 
Unreimbursed Drawing.

     Unused Amount. See Section 4.2

     Variable Rate Indebtedness. The Loans and all other Indebtedness of the 
Borrower which bears interest at a rate which is not fixed through the 
maturity of such Indebtedness.

     Voting Interests. Stock or similar ownership interests, of any class or 
classes (however designated), the holders of which are at the time entitled, 
as such holders, (a) to vote for the election of a majority of the directors 
(or persons performing similar functions) of the corporation, association, 
partnership, trust or other business entity involved, or (b) to control, 
manage or conduct the business of the corporation, partnership, association, 
trust or other business entity involved.

     West Wacker Drive Property. The Mortgaged Property located at 77 West 
Wacker Drive, Chicago, Illinois, as more particularly described in the 
Security Deed with respect thereto.

     Section 1.2. Rules of Interpretation.

          (a) A reference to any document or agreement shall include such 
document or agreement as amended, modified or supplemented from time to time 
in accordance with its terms and the terms of this Agreement.

          (b) The singular includes the plural and the plural includes the 
singular.

          (c) A reference to any law includes any amendment or modification 
to such law.

                                       18





<PAGE>

     (d) A reference to any Person includes its permitted successors and 
permitted assigns.

     (e) Accounting terms not otherwise defined herein have the meanings 
assigned to them by Generally Accepted Accounting Principles applied on a 
consistent basis by the accounting entity to which they refer and, except as 
otherwise expressly stated, all use of accounting terms with respect to the 
Borrower shall reflect the consolidated financial statements of Borrower and 
the Related Companies.

     (f) The words "include", "includes" and "including" are not limiting.

     (g) All terms not specifically defined herein or by Generally Accepted 
Accounting Principles, which terms are defined in the Uniform Commercial Code 
as in effect in Massachusetts, have the meanings assigned to them therein.

     (h) Reference to a particular "Section" refers to that section of this 
Agreement unless otherwise indicated.

     (i) The words "herein", "hereof", "hereunder" and words of like import 
shall refer to this Agreement as a whole and not to any particular section or 
subdivision of this Agreement.

     (j) The words "so long as any Loan or Note is outstanding" shall mean so 
long as such Loan or Note is not paid in full in cash.

Section 2. REVOLVING CREDIT FACILITY.

     Section 2.1. Commitment to Lend; Limitation on Total Commitment. Subject 
to the provisions of Section 2.5 and the other terms and conditions set forth 
in this Agreement, each of the Lenders severally agrees to lend to the 
Borrower and the Borrower may borrow, repay, and reborrow from time to time 
between the Effective Date and the Maturity Date upon notice by the Borrower 
to the Agent given and approved by the Agent in accordance with Section 2.5, 
such sums as are requested by the Borrower up to a maximum aggregate 
principal amount outstanding (after giving effect to all amounts requested) 
at any one time equal to such Lender's Commitment (minus such Lender's 
Commitment Percentage of the face amount of the Letters of Credit 
outstanding), provided that the Outstanding Principal Amount (after giving 
effect to all amounts requested) shall not at any time exceed the Maximum 
Principal Amount. The Loans shall be made pro rata in accordance with each 
Lender's Commitment Percentage and the Lenders shall at all times 
immediately adjust inter se any inconsistency between each Lender's 
outstanding principal amount and each Lender's Commitment. Each request for 
a Loan hereunder shall constitute a representation and warranty by the 
Borrower that the conditions set forth in Section 10 or Section 11 (whichever 
is applicable) have been satisfied on the date of such request and will be 
satisfied on the proposed Borrowing Date of the requested Loan, provided that 
the making of such

                                       19

<PAGE>

representation and warranty by Borrower shall not limit the right of any 
Lender not to lend upon a determination by the Requisite Lenders that such 
conditions have not been satisfied.

     Section 2.2. Reduction of Commitment. The Borrower shall have the right 
prior to the Maturity Date, upon at least ten (10) Business Days' prior 
written notice to the Agent, to reduce by $1,000,000 or an integral multiple 
of $100,000 in excess thereof, a portion of the Total Commitment which 
exceeds the Outstanding Principal Amount, provided that the Total Commitment 
shall not be reduced to less than the sum of $100,000,000 plus the aggregate 
face amount of Letters of Credit then outstanding rounded up to the nearest 
$1,000,000, whereupon the Commitments of the Lenders shall be reduced pro 
rata in accordance with their respective Commitment Percentages by the amount 
specified in such notice. Upon the effective date of any such reduction, the 
Borrower shall pay to the Agent for the respective accounts of the Lenders 
the full amount of any commitment fee then accrued on the amount of the 
reduction. No reduction of the Commitments may be reinstated.

     Section 2.3. The Notes. The Loans shall be evidenced by separate 
promissory notes of the Borrower in substantially the form of Exhibit A 
hereto (each a "Note"), and completed with appropriate insertions. A Note 
shall be payable to the order of each Lender in a principal amount equal to 
such Lender's Commitment. The Borrower irrevocably authorizes each Lender to 
make or cause to be made, at or about the time of the Borrowing Date of any 
Loan or at the time of receipt of any payment of principal on such Lender's 
Note, an appropriate notation on such Lender's Record reflecting the making 
of such Loan or (as the case may be) the receipt of such payment. The 
outstanding amount of the Loans set forth on such Lender's Record shall 
(absent manifest error) be prima facie evidence of the principal amount 
thereof owing and unpaid to such Lender, but the failure to record, or any 
error in so recording, any such amount on the Record shall not limit or 
otherwise affect the obligations of the Borrower hereunder or under any Note 
to make payments of principal of or interest on any Note when due.

     Section 2.4. Interest on Loans.

     (a) Each Base Rate Loan shall bear interest for the period commencing 
with the Borrowing Date thereof and ending on the last day of the Interest 
Period with respect thereto at the Base Rate.

     (b) Each Eurodollar Rate Loan shall bear interest for the period 
commencing with the Borrowing Date thereof and ending on the last day of the 
Interest Period with respect thereto at the rate equal to the Applicable 
Margin per annum above the Eurodollar Rate determined for such Interest 
Period.

     (c) The Borrower unconditionally promises to pay interest on each Loan 
in arrears on each Interest Payment Date with respect thereto.

                                       20 

<PAGE>

     (d) It is the intention of the parties hereto to conform strictly to the 
usury and similar laws relating to interest from time to time in force, and 
all agreements among Borrower, Guarantors, the Agent and the Lenders set 
forth in the Loan Documents are hereby expressly limited so that in no 
contingency or event whatsoever, whether by acceleration of maturity of Loans 
or otherwise, shall the amount paid or agreed to be paid as interest 
hereunder or under the other Loan Documents exceed the maximum rate or amount 
of interest permissible under applicable usury laws or such other laws (the 
"Maximum Interest Amount"). In the event, for any reason whatsoever, any 
payment by or act of Borrower or any Guarantor pursuant to the terms or 
pursuant to any requirements of any of the Loan Documents shall result in or 
require payment of interest which would exceed the Maximum Interest Amount, 
then ipso facto the obligation of Borrower or such Guarantor, as the case may 
be, to pay interest or fees or other amounts shall be reduced to the Maximum 
Interest Amount, so that in no event shall Borrower or any Guarantor be 
obligated to pay any interest, perform any act, or be bound by any 
requirement which would result in payment of interest in excess of a sum 
which is lawfully collectible, and all sums in excess of those lawfully 
collectible as interest shall, without further agreements or notice between 
or by any party to this Agreement or any other Loan Document, be deemed 
applied to pay the principal of the Loans immediately upon receipt of such 
moneys by Agent or any Lender, with the same force and effect as though 
Borrower or any Guarantor had specifically designated such sums to be applied 
to principal prepayment. The provisions of this Section 2.4(d) shall control 
every other provision of the Loan Documents.

     Section 2.5. Requests for Loans. The Borrower shall give to the Agent 
written notice in the form of Exhibit B hereto of each Loan requested 
hereunder (a "Loan Request") no less than (a) three (3) Business Days prior 
to the proposed Borrowing Date of any Base Rate Loan and (b) four (4) 
Eurodollar Business Days prior to the proposed Borrowing Date of any 
Eurodollar Rate Loan. Each such notice shall specify (i) the principal amount 
of the Loan requested, (ii) the proposed Borrowing Date of such Loan, (iii) 
the Interest Period for such Loan, (iv) the Type of such Loan, and (v) the 
purpose of such Loan, and shall be accompanied by a statement in the form of 
Exhibit C hereto signed by a Responsible Officer setting forth in reasonable 
detail computations evidencing compliance with the covenants contained in 
Section 9 hereof after giving effect to such requested Loan (a "Compliance 
Certificate"). Within one (1) Business Day after receipt of a Loan Request, 
the Agent shall provide to each of the Lenders by facsimile a copy of such 
Loan Request and accompanying Compliance Certificate and each Lender shall, 
within 24 hours thereafter, notify the Agent if it believes that any of the 
conditions contained in Section 11 of this Agreement has not been met or 
waived. If such a notice is given the Requisite Lenders shall promptly 
determine whether all of the conditions contained in Section 11 of this 
Agreement have been met or waived. If no such notice is given by any Lender 
or if following such notice the Requisite Lenders determine that the 
conditions contained in Section 11 have been met or waived, each of the 
Lenders shall be obligated to fund its Commitment Percentage of the requested 
Loans. Each such Loan Request shall be irrevocable and binding on the 
Borrower and the Borrower shall be obligated to accept the Loan requested 
from the Lenders on the proposed Borrowing Date. Each 

                                       21 

<PAGE>

Loan Request shall be in a minimum aggregate amount of $3,000,000 or an 
integral multiple of $1,000,000 in excess thereof.

     Section 2.6. Conversion Options.

     (a) The Borrower may elect from time to time to convert any outstanding 
Loan to a Loan of another Type, provided that (i) with respect to any such 
conversion of a Eurodollar Rate Loan to a Base Rate Loan, the Borrower shall 
give the Agent at least three (3) Business Days, prior written notice of such 
election; (ii) with respect to any such conversion of a Eurodollar Rate Loan 
into a Base Rate Loan, such conversion shall only be made on the last day of 
the Interest Period with respect thereto; (iii) subject to the further 
proviso at the end of this section and subject to Section 2.6(b) and Section 
2.6(d) hereof with respect to any such conversion of a Base Rate Loan to a 
Eurodollar Rate Loan, the Borrower shall give the Agent at least four (4) 
Eurodollar Business Days' prior written notice of such election and (iv) no 
Loan may be converted into a Eurodollar Rate Loan when any Default or Event 
of Default has occurred and is continuing. On the date on which such 
conversion is being made, each Lender shall take such action as is necessary 
to transfer its Commitment Percentage of such Loans to its Domestic Lending 
Office or its Eurodollar Lending Office, as the case may be. All or any part 
of outstanding Loans of any Type may be converted as provided herein, 
provided further that each Conversion Request relating to the conversion of a 
Base Rate Loan to a Eurodollar Rate Loan shall be for an amount equal to 
$3,000,000 or an integral multiple of $1,000,000 in excess thereof and shall 
be irrevocable by the Borrower.

     (b) Any Loans of any Type may be continued as such upon the expiration 
of an Interest Period with respect thereto by compliance by the Borrower with 
the notice provisions contained in Section 2.6 (a); provided that no 
Eurodollar Rate Loan may be continued as such when any Default or Event of 
Default has occurred and is continuing but shall be automatically converted 
to a Base Rate Loan on the last day of the first Interest Period relating 
thereto ending during the continuance of any Default or Event of Default of 
which the officers of the Agent active upon the Borrower's account have 
actual knowledge.

     (c) In the event that the Borrower does not notify the Agent of its 
election hereunder with respect to any Loan, such Loan shall be automatically 
converted to a Base Rate Loan at the end of the applicable Interest Period.

     (d) The Borrower may not request a Eurodollar Rate Loan pursuant to 
Section 2.5, elect to convert a Base Rate Loan to a Eurodollar Rate Loan 
pursuant to Section 2.5(a) or elect to continue a Eurodollar Rate Loan 
pursuant to Section 2.6(b) if, after giving effect thereto, there would be 
greater than eight (8) Eurodollar Rate Loans outstanding. Any Loan Request 
for a Eurodollar Rate Loan that would create greater than eight (8) 
Eurodollar Rate Loans outstanding shall be deemed to be a Loan Request for a 
Base Rate Loan.

                                       22

<PAGE>

     Section 2.7. Funds for Loans.

     (a) Subject to Section 2.5 and other provisions of this Agreement, not 
later than 11:00 a.m. (Boston time) on the proposed Borrowing Date of any 
Loans, each of the Lenders will make available to the Agent, at the Agent's 
Head office, in immediately available funds, the amount of such Lender's 
Commitment Percentage of the amount of the requested Loans. Upon receipt from 
each Lender of such amount, and upon receipt of the documents required by 
Sections 10 or 11 (whichever is applicable) and the satisfaction of the other 
conditions set forth therein, to the extent applicable, the Agent will make 
available to the Borrower the aggregate amount of such Loans made available 
to the Agent by the Lenders. The failure or refusal of any Lender to make 
available to the Agent at the aforesaid time and place on any Borrowing Date 
the amount of its Commitment Percentage of the requested Loans shall not 
relieve any other Lender from its several obligation hereunder to make 
available to the Agent the amount of such other Lender's Commitment 
Percentage of any requested Loans but shall not obligate any other Lender or 
Agent to fund more than its Commitment Percentage of the requested Loans or 
to increase its Commitment Percentage.

     (b) The Agent may, unless notified to the contrary by any Lender prior 
to a Borrowing Date, assume that such Lender has made available to the Agent 
on such Borrowing Date the amount of such Lender's Commitment Percentage of 
the Loans to be made on such Borrowing Date, and the Agent may (but it shall 
not be required to), in reliance upon such assumption, make available to the 
Borrower a corresponding amount. If any Lender makes available to the Agent 
such amount on a date after such Borrowing Date, such Lender shall pay to the 
Agent on demand an amount equal to the product of (i) the average computed 
for the period referred to in clause (iii) below, of the weighted average 
interest rate paid by the Agent for federal funds acquired by the Agent 
during each day included in such period, times (ii) the amount of such Lender 
's Commitment Percentage of such Loans, times (iii) a fraction, the numerator 
of which is the number of days or portion thereof that elapsed from and 
including such Borrowing Date to the date on which the amount of such Lender 
's Commitment Percentage of such Loans shall become immediately available to 
the Agent, and the denominator of which is 365.

     Section 2.8. IRB Indebtedness Account. On or before each date on which 
there is scheduled to be a Drawing under any IRB Letter of Credit pursuant to 
the IRB Documents, the Borrower will deposit in the IRB Indebtedness Account 
sufficient funds such that there will be available therein on the applicable 
Drawing Date the amount needed to reimburse the Agent for the amount of such 
Drawing. The Borrower hereby authorizes the Agent to debit the IRB 
Indebtedness Account on each Drawing Date as necessary to reimburse the Agent 
for each draft paid by the Agent pursuant to any IRB Letter of Credit. All 
payments made by the Agent pursuant to any drafts under the IRB Letters of 
Credit shall be made from funds of the Agent, but in no event shall any such 
payments be made with funds from the IRB Indebtedness Account or with any 

                                       23

<PAGE>

other funds obtained from the Borrower, any Guarantor or any issuer of bonds 
with respect to any IRB Indebtedness.

     Section 2.9. Letters of Credit.

     (a) A portion of the Commitments may be used by Borrower for the 
issuance of Letters of Credit by the Agent for the account of the Borrower 
subject to the terms and conditions set forth herein, provided that the 
aggregate face amount of all Letters of Credit shall not exceed $105,000,000 
during the period from the Effective Date until the earlier to occur of (i) 
the date that the Letter of Credit for the benefit of Credit Suisse First 
Boston is drawn on so as to reduce the amount available thereunder, or is 
amended or replaced so as to reduce the face amount thereof, by more than 
$15,000,000 or (ii) April 16, 1998, and thereafter shall not exceed 
$90,000,000. Each Letter of Credit shall be denominated in dollars and shall 
be a either a direct pay IRB Letter of Credit, a direct pay letter of credit 
supporting bond related Indebtedness similar to the IRB Letters of Credit or 
a standby letter of credit issued to support the obligations of Borrower in 
connection with Permitted Developments. Each Letter of Credit shall expire no 
later than five (5) Business Days prior to the Maturity Date. Although the 
Agent shall be the issuing bank of the Letter of Credit, each Lender hereby 
accepts for its own account and risk an undivided interest equal to its 
Commitment Percentage in the Agent's obligations represented by each Letter 
of Credit issued hereunder, and unconditionally and irrevocably agrees with 
the Agent that, upon any Unreimbursed Drawing, such Lender shall promptly pay 
to the Agent an amount equal to such Lender's Commitment Percentage of the 
amount of such Unreimbursed Drawing. Upon the issuance of each Letter of 
Credit hereunder, there shall be reserved from each Lender's Commitment an 
amount equal to such Lender's Commitment Percentage of the face amount of 
the Letter of Credit. Such reserved amounts shall remain in place and shall 
be unavailable for borrowing under Section 2.1 until the date that the Letter 
of Credit expires or is terminated.

     (b) If the Borrower shall desire the issuance of any Letters of Credit 
or the extension or renewal of any outstanding Letters of Credit, it shall 
give to the Agent a written notice in the form of Exhibit D hereto of each 
Letter of Credit requested hereunder (a "Letter of Credit Request") no less 
than ten (10) Business Days prior to the proposed issuance date of the 
requested Letter of Credit or prior to the expiration date of any Letter of 
Credit to be renewed or extended. Each Letter of Credit Request shall specify 
(i) the name and address of the beneficiary of the requested Letter of 
Credit, (ii) the face amount of the requested Letter of Credit, (iii) the 
proposed issuance date and expiration date of the requested Letter of Credit, 
(iv) the proposed form of the requested Letter of Credit, and (v) the 
permitted purpose for which the Letter of Credit will be used, and shall be 
accompanied by a Compliance Certificate in the form of Exhibit C hereto 
signed by a Responsible Officer setting forth in reasonable detail 
computations evidencing compliance with the covenants contained in Section 9 
hereof after including in the Outstanding Principal Amount the face amount of 
the requested Letter of Credit. The Agent may also require that the Borrower 
complete its standard letter of credit application form and 

                                       24

<PAGE>

submit the same and the standard application fee together with the Letter of 
Credit Request. The Letter of Credit Requests with respect to the Initial 
Letters of Credit are hereby approved. Within two (2) Business Days after 
receipt of any other Letter of Credit Request, the Agent shall provide to 
each of the Lenders by facsimile a copy of such Letter of Credit Request and 
accompanying Compliance Certificate and each Lender shall, within 24 hours 
thereafter, notify the Agent if it believes that any of the conditions 
contained in Section 11 of this Agreement has not been met or waived such 
that a Loan in an amount equal to the face amount of the requested Letter of 
Credit could be made on the proposed issuance date of such Letter of Credit. 
If such a notice is given the Requisite Lenders shall promptly determine 
whether all of the conditions contained in Section 11 of this Agreement have 
been met or waived. If no such notice is given by any Lender or if following 
such notice the Requisite Lenders determine that the conditions contained in 
Section 11 have been met or waived, and if the Agent determines, in its 
discretion, that it is willing to issue, extend or renew the requested Letter 
of Credit, and that it is satisfied with the proposed form thereof, the 
Letter of Credit shall be issued, extended or renewed by the Agent and each 
of the Lenders shall then be obligated to the Agent with respect to its 
Commitment Percentage of the Letter of Credit (as extended or renewed, if 
applicable) as provided above in Section 2.9(a).

     (c) On or before the issuance date of any Letters of Credit having an 
expiration date of one year or less after its issuance date, the Borrower 
shall pay to the Agent for its own account an issuance fee equal to 
one-eighth percent (.125%) of the face amount of the Letter of Credit. The 
issuance fee for any Letter of Credit with a later expiration date will be 
determined by the Agent. On or before the date of any extension or renewal of 
a Letter of Credit, the Borrower shall pay to the Agent for its own account a 
renewal fee for each year of the extension renewal term equal to one-tenth 
percent (.10%) of the face amount of the applicable Letter of Credit. The 
Borrower shall pay to the Agent for the account of the Lenders a Letter of 
Credit fee equal to the then prevailing Applicable Margin per annum of the 
face amount of the Letter of Credit, which Letter of Credit fee shall be due 
and payable in advance on the issuance date of the Letter of Credit and on 
the first day of each calendar quarter for so long as such Letter of Credit 
remains outstanding, and shall be prorated for any partial quarter and paid 
for the actual number of days between the issuance date and the expiration 
date of such Letter of Credit. Promptly after its receipt thereof the Agent 
shall distribute such Letter of Credit fee to the Lenders pro-rata in 
accordance with their respective Commitment Percentages. Such fees shall be 
nonrefundable and shall not be further prorated in the event that the Letter 
of Credit terminates prior to its scheduled expiration date. The Borrower 
also agrees to reimburse the Agent for all reasonable fees (consistent with 
the fee schedule of the Agent's trade services division as then in effect), 
costs, expenses and disbursements of the Agent in issuing, effecting payment 
under, amending or otherwise administering any Letter of Credit.

     (d) Promptly after each Unreimbursed Drawing the Agent shall notify the 
Lenders and the Borrower of the amount thereof. The payment of each 
Unreimbursed Drawing shall constitute an advance of a Loan which shall bear 
interest as a Base Rate Loan from the Drawing Date. On the Drawing Date of 
each Unreimbursed Drawing, each Lender shall pay to the Agent

                                       25

<PAGE>

its Commitment Percentage of the amount of such Unreimbursed Drawing. If the 
Agent receives such payment from any Lender on a date after the Drawing Date, 
such Lender shall pay to the Agent on demand an amount computed in the same 
manner as the amount due to the Agent from a Lender which has made available 
funds for loans after the Borrowing Date thereof pursuant to Section 2.7(b). 
Each Lender's obligation to pay its Commitment Percentage of each 
Unreimbursed Drawing shall not be subject to the satisfaction of the 
conditions set forth in Section 11. Within three (3) Business Days after each 
Unreimbursed Drawing, the Borrower shall deliver to the Agent a written 
explanation of the facts and circumstances relating to such drawing and a 
Compliance Certificate and any other information requested by the Agent for 
the purpose of allowing the Lenders to determine whether the drawing or 
related events have resulted in a Default or Event of Default. The Agent 
shall promptly provide copies of such explanation and information to the 
Lenders.

     (e) The Borrower's obligations under this Section 2.9 shall be absolute 
and unconditional under any and all circumstances and irrespective of any 
set-off, counterclaim or defense to payment which the Borrower may have or 
have had against the Agent, any Lender or any beneficiary of a Letter of 
Credit. The Borrower also agrees that the Agent shall not be responsible for, 
and the Borrower's reimbursement obligations hereunder shall not be affected 
by, among other things, (i) the validity or genuineness of documents or of 
any endorsements thereon, even though such documents shall in fact prove to 
be invalid, fraudulent or forged, or (ii) any dispute between or among the 
Borrower and any beneficiary of any Letter of Credit or any other party to 
which such Letter of Credit may be transferred or (iii) any claims whatsoever 
of the Borrower against any beneficiary of such Letter of Credit or any such 
transferee. The Agent shall not be liable for any error, omission, 
interruption or delay in transmission, dispatch or delivery of any message or 
advice, however transmitted, in connection with any Letter of Credit, except 
for errors, omissions, interruptions or delays for which the Agent is liable 
under the Uniform Customs and Practices for Documentary Credits. The Borrower 
assumes all risks of the acts or omissions of any trustee, paying agent, 
tender agent or remarketing agent under the IRB Indebtedness and the Agent 
shall not be responsible for any use which may be made of the IRB Letters of 
Credit. The Borrower agrees that any action taken or omitted by the Agent 
under or in connection with any Letter of Credit or the related drafts or 
documents, if done in accordance with the standards of care specified in the 
Uniform Customs and Practices for Documentary Credits as the same may be 
amended from time to time, shall be binding on the Borrower and shall not 
result in any liability of the Agent to the Borrower or to any Guarantor.

     Section 3. REPAYMENT OF THE LOANS.

     Section 3.1. Maturity. The Borrower unconditionally promises to pay on 
the Maturity Date, and there shall become absolutely due and payable on the 
Maturity Date, all of the Loans outstanding on such date, together with any 
and all accrued and unpaid interest and charges thereon.

     Section 3.2. Mandatory Repayments of Loan. If at any time the sum of the 
Outstanding Principal Amount exceeds the Maximum Principal Amount, then the 
Borrower shall

                                       26 

<PAGE>

immediately pay the amount of such excess to the Agent for the respective 
accounts of the Lenders for application to the Loans.

     Section 3.3. Optional Repayments of Loans. The Borrower shall have the 
right, at its election, to repay the outstanding amount of the Loans, as a 
whole or in part, on any Business Day, without penalty or premium; provided 
that the full or partial prepayment of the outstanding amount of any 
Eurodollar Rate Loans made pursuant to this Section 3.3 may be made only on 
the last day of the Interest Period relating thereto, except as set forth 
below in this Section 3.3. The Borrower shall give the Agent no later than 
10:00 a.m., Boston time, at least three (3) Business Days' prior written 
notice of any prepayment pursuant to this Section 3.3 of any Base Rate Loans 
and four (4) Eurodollar Business Days, notice of any proposed repayment 
pursuant to this Section 3.3 of any Eurodollar Rate Loans, specifying the 
proposed date of payment of Loans and the principal amount to be paid. Each 
such partial prepayment of the Loans shall be in an integral multiple of 
$100,000 and shall be accompanied by the payment of all charges outstanding 
on all Loans and of accrued interest on the principal repaid to the date of 
payment and shall be applied, in the absence of instruction by the Borrower, 
first to the principal of Base Rate Loans and then to the principal of 
Eurodollar Rate Loans. Notwithstanding anything contained herein to the 
contrary, the Borrower may make a full or partial prepayment of a Eurodollar 
Rate Loan on a date other than the last day of the Interest Period relating 
thereto, if all optional prepayments (in whole or in part) on such Loans 
shall be accompanied by, and the Borrower hereby promises to pay, a 
prepayment fee in an amount determined by the Agent in the following manner:

     (i) Fixed Rate Prepayment Fee. Borrower acknowledges that prepayment or 
acceleration of a Eurodollar Loan during an Interest Period shall result in 
the Lenders incurring additional costs, expenses and/or liabilities and that 
it is impractical to ascertain the extent of such costs, expenses and/or 
liabilities. (For all purposes of this Section, any Loan not being made as a 
Eurodollar Rate Loan in accordance with the Loan Request therefor, as a 
result of Borrower's cancellation thereof, shall be treated as if such 
Eurodollar Rate Loan had been prepaid.) Therefore, on the date a Eurodollar 
Rate Loan is prepaid or the date all sums payable hereunder become due and 
payable, by acceleration or otherwise ("Prepayment Date"), Borrower will pay 
to Agent, for the account of each Lender, (in addition to all other sums 
then owing), an amount ("Fixed Rate Prepayment Fee") determined by the Agent 
to be the amount, if any, by which (i) the amount of interest which would 
have accrued on the prepaid Eurodollar Rate Loan for the remainder of the 
Interest Period at the rate applicable to such Eurodollar Rate Loan exceeds 
(ii) the amount of interest that would accrue for the same period on any 
readily marketable bond or other obligation of the United States of America 
designated by the Agent in its sole discretion at or about the time of such 
payment, such bond or other obligation of the United States of America to be 
in an amount equal (as nearly as may be) to the amount of principal so paid 
or not borrowed and to have a maturity comparable to the remainder of such 
Interest Period, and the interest to accrue thereon to take account of 
amortization of any discount from par or accretion of premium above par at 
which the same is selling at the time designation.

                                       27

<PAGE>

     (ii) Upon the written notice to Borrower from Agent, Borrower shall 
immediately pay to Agent, for the account of the Lenders, the Fixed Rate 
Prepayment Fee. Such written notice (which shall include calculations in 
reasonable detail) shall, in the absence of manifest error, be conclusive and 
binding on the parties hereto.

     (iii) Borrower understands, agrees and acknowledges the following: (i) 
no Lender has any obligation to purchase, sell and/or match funds in 
connection with the use of the Eurodollar Rate as a basis for calculating the 
rate of interest on a Eurodollar Rate Loan; (ii) the Eurodollar Rate is used 
merely as a reference in determining such rate; and (iii) Borrower has 
accepted the Eurodollar Rate as a reasonable and fair basis for calculating 
such rate and a Fixed Rate Prepayment Fee. Borrower further agrees to pay the 
Fixed Rate Prepayment Fee, if any, whether or not a Lender elects to 
purchase, sell and/or match funds.

     Section 4. CERTAIN GENERAL PROVISIONS.

     Section 4.1. Revolving Credit Facility Fees and Agent's Fee. The 
Borrower agrees to pay to the Lead Lenders and the Agent revolving credit 
facility fees and agency fees in the amounts specified in the Fee Agreement 
dated October 20, 1997 among the Lead Lenders, the Borrower, the Company and 
The Prime Group, Inc. The Lead Lenders shall be responsible for any facility 
fees which they may agree to pay to the other Lenders which become a party to 
this Agreement. If the Borrower obtains releases of one or more Mortgaged 
Properties pursuant to Section 5.5, and simultaneously or thereafter provides 
Additional Properties pursuant to Section 5.3 and Section 5.4 to replace the 
Collateral Value of the released property, the Borrower shall pay a 
substitution fee to the Agent for its own account in the amount of $2,500 per 
Additional Property.

     Section 4.2. Commitment Fee. The Borrower shall pay to the Agent for the 
accounts of the Lenders in accordance with their respective Commitment 
Percentages a commitment fee calculated at the rates set forth below per 
annum on the daily amount by which the Total Commitment (as it may have been 
reduced pursuant to Section 2.2) exceeds the Outstanding Principal Amount 
(the "Unused Amount"):

<TABLE><CAPTION>

Unused Amount                                     Fee Rate
- -------------                                     --------
<S>                                            <C>

less than 1/3 of Total Commitment              15 basis points
at least 1/3 of Total Commitment
but less than 2/3 of Total Commitment          20 basis points
at least 2/3 of Total Commitment               25 basis points

</TABLE>

The commitment fee shall be payable on the basis of the applicable annual 
rate quarterly in arrears on the first day of each calendar quarter for the 
immediately preceding calendar quarter commencing on the first such date 
following the date hereof, with a final payment on the Maturity Date or any 
earlier date on which the Commitments shall terminate.

                                       28

<PAGE>

     Section 4.3. Funds for Payments.

     (a) All payments of principal, interest, closing fees, commitment fees 
and any other amounts due hereunder (other than as provided in Section 4.1, 
Section 4.5 and Section 4.6) or under any of the other Loan Documents, and 
all prepayments, shall be made to the Agent, for the respective accounts of 
the Lenders, at the Agent's Head Office, in each case in Dollars in 
immediately available funds.

     (b) All payments by the Borrower hereunder and under any of the other 
Loan Documents shall be made without setoff or counterclaim and free and 
clear of and without deduction for any taxes, levies, imposts, duties, 
charges, fees, deductions, withholdings, compulsory liens, restrictions or 
conditions of any nature now or hereafter imposed or levied by any 
jurisdiction or any political subdivision thereof or taxing or other 
authority therein unless the Borrower is compelled by law to make such 
deduction or withholding. If any such obligation is imposed upon the Borrower 
with respect to any amount payable by it hereunder or under any of the other 
Loan Documents, the Borrower shall pay to the Agent, for the account of the 
Lenders or (as the case may be) the Agent, on the date on which such amount 
is due and payable hereunder or under such other Loan Document, such 
additional amount in Dollars as shall be necessary to enable the Lenders or 
the Agent to receive the same net amount which the Lenders or the Agent would 
have received on such due date had no such obligation been imposed upon the 
Borrower. The Borrower will deliver promptly to the Agent certificates or 
other valid vouchers for all taxes or other charges deducted from or paid 
with respect to payments made by the Borrower hereunder or under such other 
Loan Document.

     Section 4.4. Computations. All computations of interest on the Loans and 
of other fees to the extent applicable shall be based on a 360-day year and 
paid for the actual number of days elapsed. Except as otherwise provided in 
the definition of the term "Interest Period" with respect to Eurodollar Rate 
Loans, whenever a payment hereunder or under any of the other Loan Documents 
becomes due on a day that is not a Business Day, the due date for such 
payment shall be extended to the next succeeding Business Day, and interest 
shall accrue during such extension. The outstanding amount of the Loans as 
reflected on the Records from time to time shall (absent manifest error) be 
considered correct and binding on the Borrower unless within thirty (30) 
Business Days after receipt by the Agent or any of the Lenders from Borrower 
of any notice by the Borrower of such outstanding amount, the Agent or such 
Lender shall notify the Borrower to the contrary.

     Section 4.5. Additional Costs, Etc. If any present or future applicable 
law which expression, as used herein, includes statutes, rules and 
regulations thereunder and interpretations thereof by any competent court or 
by any governmental or other regulatory body or official charged with the 
administration or the interpretation thereof and requests, directives, 
instructions and notices at any time or from time to time hereafter made upon 
or otherwise issued to any Lender or the

                                       29

<PAGE>

Agent by any central bank or other fiscal, monetary or other authority 
(whether or not having the force of law), shall:

     (a) subject any Lender or the Agent to any tax, levy, impost, duty, 
charge, fee, deduction or withholding of any nature with respect to this 
Agreement, the other Loan Documents, such Lender's Commitment or the Loans 
(other than taxes based upon or measured by the income or profits of such 
Lender or the Agent), or

     (b) materially change the basis of taxation (except for changes in taxes 
on income or profits) of payments to any Lender of the principal of or the 
interest on any Loans or any other amounts payable to any Lender under this 
Agreement or the other Loan Documents, or

     (c) impose or increase or render applicable (other than to the extent 
specifically provided for elsewhere in this Agreement) any special deposit, 
reserve, assessment, liquidity, capital adequacy or other similar 
requirements (whether or not having the force of law) against assets held by, 
or deposits in or for the account of, or loans by, or commitments of an 
office of any Lender, or

     (d) impose on any Lender any other conditions or requirements with 
respect to this Agreement, the other Loan Documents, the Loans, the 
Commitment, or any class of loans or commitments of which any of the Loans or 
the Commitment forms a part;

and the result of any of the foregoing is

     (i) to increase the cost to such Lender of making, funding, issuing, 
renewing, extending or maintaining any of the Loans or such Lender's 
Commitment, or

     (ii) to reduce the amount of principal, interest or other amount payable 
to such Lender or the Agent hereunder on account of the Commitments or any of 
the Loans, or

     (iii) to require such Lender or the Agent to make any payment or to 
forego any interest or other sum payable hereunder, the amount of which 
payment or foregone interest or other sum is calculated by reference to the 
gross amount of any sum receivable or deemed received by such Lender or the 
Agent from the Borrower hereunder,

then, and in each such case, the Borrower will, upon demand made by such 
Lender or (as the case may be) the Agent at any time and from time to time 
and as often as the occasion therefor may arise, pay to such Lender or the 
Agent, to the extent permitted by law, such additional amounts as will be 
sufficient to compensate such Lender or the Agent for such additional cost, 
reduction, payment or foregone interest or other sum.

                                       30

<PAGE>

     Section 4.6. Capital Adequacy. If any present or future law, 
governmental rule, regulation, policy, guideline or directive (whether or not 
having the force of law) or the interpretation thereof by a court or 
governmental authority with appropriate jurisdiction affects the amount of 
capital required or expected to be maintained by banks or bank holding 
companies and any Lender or the Agent determines that the amount of capital 
required to be maintained by it is increased by or based upon the existence 
of the Loans made or deemed to be made pursuant hereto, then such Lender or 
the Agent may notify the Borrower of such fact, and the Borrower shall pay to 
such Lender or the Agent from time to time on demand, as an additional fee 
payable hereunder, such amount as such Lender or the Agent shall determine in 
good faith and certify in a notice to the Borrower to be an amount that will 
adequately compensate such Lender or the Agent in light of these 
circumstances for its increased costs of maintaining such capital. Each 
Lender and the Agent shall allocate such cost increases among its customers 
in good faith and on an equitable basis.

     Section 4.7. Certificate. A certificate setting forth any additional 
amounts payable pursuant to Sections 4.5 or 4.6 and a brief explanation of 
such amounts which are due, submitted by any Lender or the Agent to the 
Borrower, shall be prima facie evidence that such amounts are due and owing.

     Section 4.8. Indemnity. In addition to the other provisions of this 
Agreement regarding any such matters, the Borrower agrees to indemnify each 
Lender and to hold each Lender harmless from and against any loss, cost or 
reasonable expense (including loss of anticipated profits) that such Lender 
may sustain or incur as a consequence of (a) a default by the Borrower in 
payment of the principal amount of or any interest on any Eurodollar Rate 
Loans as and when due and payable, including any such loss or expense caused 
by Borrower's breach or other default and arising from interest or fees 
payable by such Lender to lenders of funds obtained by it in order to 
maintain its Eurodollar Rate Loans, (b) a default by the Borrower in making a 
borrowing or conversion after the Borrower has given (or is deemed to have 
given) a Loan Request or a Conversion Request, and (c) the making of any 
payment of a Eurodollar Rate Loan or the making of any conversion of a 
Eurodollar Rate Loan to a Base Rate Loan on a day that is not the last day of 
the applicable Interest Period with respect thereto, including interest or 
fees payable by such Lender to lenders of funds obtained by it in order to 
maintain any such Eurodollar Rate Loan.

     Section 4.9. Interest on Overdue Amounts. Overdue principal and (to the 
extent permitted by applicable law) interest on the Loans and all other 
overdue amounts payable hereunder or under any of the other Loan Documents 
shall bear interest compounded monthly and payable on demand at a rate per 
annum equal to four percent (4%) above the Base Rate until such amount shall 
be paid in full (after as well as before judgment). In addition, the 
Borrower shall pay to the Agent a late charge equal to three percent (3%) of 
any amount of principal and/or interest and/or charges on the Loans which is 
not paid within ten (10) days of the date when due.

                                       31

<PAGE>

     Section 4.10. Inability to Determine Eurodollar Rate. In the event, 
prior to the commencement of any Interest Period relating to any Eurodollar 
Rate Loan, the Agent shall determine that adequate and reasonable methods do 
not exist for ascertaining the Eurodollar Rate that would otherwise determine 
the rate of interest to be applicable to any Eurodollar Rate Loan during any 
Interest Period, the Agent shall forthwith give notice of such determination 
(which shall be conclusive and binding on the Borrower) to the Borrower. In 
such event (a) any Loan Request with respect to Eurodollar Rate Loans shall 
be automatically withdrawn and shall be deemed a request for Base Rate Loans, 
(b) each Eurodollar Rate Loan will automatically, on the last day of the then 
current Interest Period thereof, become a Base Rate Loan, and (c) the 
obligations of the Lenders to make Eurodollar Rate Loans shall be suspended 
until the Agent determines that the circumstances giving rise to such 
suspension no longer exist, whereupon the Agent shall so notify the Borrower.

     Section 4.11. Illegality. Notwithstanding any other provisions herein, 
if any present or future law, regulation, treaty or directive or in the 
interpretation or application thereof shall make it unlawful for any Lender 
to make or maintain Eurodollar Rate Loans, such Lender shall forthwith give 
notice of such circumstances to the Borrower and thereupon (a) the Commitment 
of such Lender to make Eurodollar Rate Loans or convert Loans of another Type 
to Eurodollar Rate Loans shall forthwith be suspended and (b) the Eurodollar 
Rate Loans then outstanding shall be converted automatically to Base Rate 
Loans on the last day of each Interest Period applicable to such Eurodollar 
Rate Loans or within such earlier period as may be required by law. The 
Borrower hereby agrees promptly to pay to the Agent for the account of such 
Lender, upon demand, any additional amounts necessary to compensate such 
Lender for any reasonable costs incurred by such Lender in making any 
conversion in accordance with this Section 4.11, including any interest or 
fees payable by such Lender to lenders of funds obtained by it in order to 
make or maintain its Eurodollar Rate Loans hereunder.

     Section 4.12. Replacement of Lenders. If any of the Lenders shall make a 
notice or demand upon the Borrower pursuant to Section 4.5, Section 4.6, or 
Section 4.11 based on circumstances or laws which are not generally 
applicable to the Lenders organized under the laws of the United States or 
any State thereof, the Borrower shall have the right to replace such Lender 
with an Eligible Assignee selected by the Borrower and approved by the Agent. 
In such event the assignment shall take place on a date set by the Agent at 
which time the assigning Lender and the Eligible Assignee shall enter into an 
Assignment and Acceptance as contemplated by Section 18.1 (and clause (d) 
thereof shall not be applicable) and the assigning Lender shall receive from 
the Eligible Assignee or the Borrower a sum equal to the outstanding 
principal amount of the Loans owed to the assigning Lender together with 
accrued interest thereon plus the accrued commitment fee under Section 4.2 
allocated to the assigning Lender.

     Section 4.13. U.S. Tax Certificates. Each Lender that is organized under 
the laws of any jurisdiction other than the United States of America or any 
state or other political subdivision thereof shall deliver to the Agent for 
transmission to the Borrower, on the date it becomes a 

                                       32

<PAGE>

Lender, and at such other times as may be necessary in the determination of 
the Borrower or the Agent (each in the reasonable exercise of its 
discretion), such certificates, documents or other evidence, properly 
completed and duly executed by such Lender (including Internal Revenue 
Service Form 1001 or Form 4224 or any other certificate or statement of 
exemption required by Treasury Regulations Section 1.1441-4(a) or Section 
1.1441-6(c) or any successor thereto) to establish that such Lender is not 
subject to deduction or withholding of United States federal income tax under 
Section 1441 or 1442 of the Internal Revenue Code or otherwise (or under any 
comparable provisions of any successor statute) with respect to any payments 
to such Lender of principal, interest, fees or other amounts payable under 
any of the Loan Documents.

     Section 5. COLLATERAL SECURITY; NO LIMITATION ON RECOURSE.

     Section 5.1. Collateral Security. The Obligations shall be secured by 
(i) a perfected first priority lien and security interest to be held by the 
Agent (subject only to Permitted Liens) in the Mortgaged Properties, pursuant 
to the terms of the Security Documents, (ii) a perfected first priority lien 
and security interest to be held by the Agent in the Leases and rents 
pursuant to the Assignments of Leases and Rents, (iii) a first priority 
pledge of any pledged bonds purchased with the proceeds of Drawings under any 
IRB Letter of Credit pursuant to the Pledge Agreements, and (iv) the 
Guaranties.

     Section 5.2. No Limitation on Recourse. Notwithstanding the foregoing 
Collateral, the Obligations are full recourse obligations of the Borrower 
(with recourse to its partners limited to the extent provided in Section 28) 
and, to the extent provided in the applicable Guaranty, of the Guarantors, 
and all of their respective Real Estate Assets and other properties shall be 
available for the indefeasible payment in full in cash and performance of the 
Obligations.

     Section 5.3. Additional Properties.

     (a) Additional Real Estate Assets owned by the Borrower or by a 
Guarantor Subsidiary may become Mortgaged Properties with the approval of the 
Lead Lenders provided that such Real Estate Assets satisfy the conditions set 
forth in Section 5.4. In the event that the Lead Lenders grant such approval 
and all of the conditions set forth in Section 5.4 are satisfied, the Agent 
shall notify the Borrower and within ten (10) days thereafter the Borrower 
and the Company shall execute and deliver an Indemnity Agreement and the 
Mortgagor shall execute and deliver to the Agent a Security Deed, an 
Assignment of Rents and Leases and UCC-1 Financing Statements, which Security 
Documents shall be in substantially the form of the Security Documents 
executed and delivered herewith with such changes as the Agent may deem 
desirable to address the laws of the State where the Additional Property is 
located or the factual circumstances of the Additional Property. Such 
Additional Properties shall be deemed to be Mortgaged Properties upon the 
recording and filing of such Security Documents and the Agent's receipt of 
satisfactory evidence thereof.

                                       33

<PAGE>

     (b) The Lead Lenders hereby approve the Real Estate Assets described on 
Schedule 5.3(b) which Borrower agrees to add as Mortgaged Properties 
hereunder on or before December 10, 1997. Upon satisfaction of the conditions 
set forth in Section 5.4, the Agent shall revise Schedule 1.1 to include such 
Additional Properties.

     (c) The Agent and the Lead Lenders shall use their best efforts to 
complete their review of the documents submitted with respect to each 
Additional Property and notify the Borrower as to whether the conditions in 
Section 5.4 are satisfied within ten (10) Business Days after receipt of the 
last of the items required pursuant to Section 5.4.

     Section 5.4. Conditions to Approval of Additional Properties. Prior to 
acceptance of any Real Estate Asset to become an Additional Property pursuant 
to Section 5.3, such property must satisfy the following conditions, which 
may be modified or waived only by the written agreement of the Requisite 
Lenders:

     (a) If the Additional Property is not owned by the Borrower or an 
existing Guarantor Subsidiary, but is owned by a Related Company which is at 
least 99% owned by Borrower, such Related Company must become a Guarantor 
Subsidiary by delivery to the Agent the following, all in form and substance 
satisfactory to the Agent: (i) a Guaranty in substantially the form of the 
Guaranty executed and delivered by the Guarantor Subsidiaries prior to the 
Effective Date and (ii) good standing certificates, general partner 
certificates, secretary certificates, opinions of counsel and such other 
documents as may be reasonably requested by the Agent.

     (b) An Appraisal of the Additional Property ordered by the Agent and 
paid for by the Borrower shall have been approved by the Lead Lenders.

     (c) The Agent shall have received all of the items relating to the 
Additional Property described in Section 10.8, Section 10.9, Section 10.10, 
Section 10.12, Section 10.13, Section 10.14, Section 10.16 and Section 10.18 
and such items shall have been approved by the Agent or the Lead Lenders as 
required by such Sections.

     (d) The Agent shall have received a Certificate executed on behalf of 
the Borrower containing the representations and warranties with respect to 
the Additional Property as are set forth in Section 6.18 and Section 6.22, to 
which there shall be attached a current rent roll for the Additional Property 
which shall be deemed to supplement and become a part of Schedule 6.22(l) 
hereto.

     (e) The Borrower shall have requested estoppel certificates in form 
reasonably satisfactory to the Agent from the tenants under all Leases of the 
Additional Property, shall have used its best efforts to obtain all such 
estoppel certificates and shall have received such estoppel certificates as 
the Lead Lenders may, in their discretion, require, and all estoppel 
certificates received shall be satisfactory to the Lead Lenders.

                                       34

<PAGE>

     (f) The Agent shall have received updated certificates and other items 
relating to the Borrower, the Company and the applicable Guarantor Subsidiary 
as described in Section 10.2, Section 10.3 and Section 10.4 and a favorable 
opinion addressed to the Lenders and the Agent, in form and substance 
satisfactory to the Lenders and the Agent as to the matters described on 
Exhibit E relating to the Loan Documents executed by Borrower and/or the 
Mortgagor with respect to the Additional Property and relating to the laws of 
the state where the Additional Property is located.

     Section 5.5. Release of Mortgaged Properties. The Borrower may request 
that the Agent release any Mortgaged Property from the lien of the Security 
Documents and the Agent shall approve any such request provided that there is 
then no continuing Default or Event of Default under this Agreement and the 
requested release will not result in any Default or Event of Default under 
this Agreement and the Borrower delivers to the Agent a pro-forma Compliance 
Certificate reasonably satisfactory to the Agent demonstrating that the 
requested release will not result in a violation of any of the covenants in 
Section 9. The Borrower may request releases of a portion of a Mortgaged 
Property consisting of undeveloped land to be developed by Borrower or sold 
provided that in addition to the requirements set forth above, the Borrower 
shall also submit such additional information as may be reasonably requested 
by the Agent including, without limitation, (i) an updated survey and 
endorsements to the Title Policy; (ii) an updated Appraisal of the remaining 
portion of the Mortgaged Property and (iii) evidence that the division of the 
Mortgaged Property pursuant to the requested release will not result in 
violation of any zoning ordinance or other applicable laws and ordinances. If 
the Borrower shall request the release of any Mortgaged Property which is 
adjacent to any other Mortgaged Property which is not to be simultaneously 
released, the Agent may require the establishment of appropriate easements 
and maintenance agreements satisfactory to the Agent relating to any shared 
utilities, drainage facilities, access drives or walks, parking areas or 
other shared facilities.

     Section 6. REPRESENTATIONS AND WARRANTIES. The Borrower represents and 
warrants to the Agent and each of the Lenders as follows, and to the extent 
that the following representations and warranties relate to the Company, the 
Company represents and warrants to the Agent and each of the Lenders as 
follows:

                                       35
<PAGE>

     Section 6.1. Authority; Etc.

     (a) Organization; Good Standing. The Company (i) is a Maryland real estate
investment trust duly organized, validly existing and in good standing under the
laws of the State of Maryland, (ii) has all requisite power to own its
properties and conduct its business as now conducted and as presently
contemplated, and (iii) to the extent required by law is in good standing as a
foreign entity and is duly authorized to do business in the States in which the
Mortgaged Properties are located and in each other jurisdiction where such
qualification is necessary except where a failure to be so qualified in such
other jurisdiction would not have a Materially Adverse Effect. The Borrower is a
Delaware limited partnership, and each Guarantor Subsidiary is a limited
partnership or a limited liability company formed under the laws of Illinois,
Tennessee or Delaware, and each such entity is duly organized, validly existing
and in good standing under the laws of the State of its formation, has all
requisite power to own its properties and conduct its business as presently
contemplated and is duly authorized to do business in the States in which the
Mortgaged Properties owned by it are located and in each other jurisdiction
where such qualification is necessary.

     (b) Authorization. The execution, delivery and performance of this
Agreement and the other Loan Documents to which the Borrower is to become a
party and the transactions contemplated hereby and thereby (i) are within the
authority of the Borrower, (ii) have been duly authorized by all necessary
proceedings on the part of the Borrower and the Company, (iii) do not conflict
with or result in any breach or contravention of any provision of law, statute,
rule or regulation to which the Borrower or the Company is subject or any
judgment, order, writ, injunction, license or permit applicable to the Borrower
or the Company and (iv) do not conflict with any provision of the Borrower's
partnership agreement or Company's declaration of trust, charter documents or
bylaws, or any material agreement or other material instrument binding upon, the
Borrower or the Company or to which any of their properties are subject. The
execution, delivery and performance of the Guaranty and the other Loan Documents
to which any Guarantor is to become a party and the transactions contemplated
hereby and thereby (i) are within the authority of such Guarantor, (ii) have
been duly authorized by all necessary proceedings on the part of such Guarantor,
(iii) do not conflict with or result in any breach or contravention of any
provision of law, statute, rule or regulation to which such Guarantor is subject
or any judgment, order, writ, injunction, license or permit applicable to such
Guarantor and (iv) do not conflict with any provision of such Guarantor's
charter documents or bylaws, partnership agreement, limited liability company
agreement, declaration of trust, or any agreement or other instrument binding
upon such Guarantor or to which any of such Guarantor's properties are subject.

     (c) Enforceability. The execution and delivery of this Agreement and the
other Loan Documents to which the Borrower is or is to become a party will
result in valid and legally binding obligations of the Borrower enforceable
against it in accordance with the respective terms and provisions hereof and
thereof, except as enforceability is limited by bankruptcy,

                                       36
<PAGE>

insolvency, reorganization, moratorium or other laws relating to or affecting
generally the enforcement of creditors' rights and except to the extent that
availability of the remedy of specific performance or injunctive relief is
subject to the discretion of the court before which any proceeding therefor may
be brought. The execution and delivery of this Agreement and the Indemnity
Agreement will result in valid and legally binding obligations of the Company
enforceable against it in accordance with the respective terms and provisions
hereof and thereof, except as enforceability is limited by bankruptcy,
insolvency, reorganization, moratorium or other laws relating to or affecting
generally the enforcement of creditors' rights and except to the extent that
availability of the remedy of specific performance or injunctive relief is
subject to the discretion of the court before which any proceeding therefor may
be brought. The execution and delivery of the Guaranty and the other Loan
Documents to which any Guarantor is or is to become a party will result in valid
and legally binding obligations of such Guarantor enforceable against such
Guarantor in accordance with the respective terms and provisions hereof and
thereof, except as enforceability is limited by bankruptcy, insolvency,
reorganization, moratorium or other laws relating to or affecting generally the
enforcement of creditors' rights and except to the extent that availability of
the remedy of specific performance or injunctive relief is subject to the
discretion of the court before which any proceeding therefor may be brought.

     Section 6.2. Governmental Approvals. The execution, delivery and 
performance by the Borrower and each Guarantor of this Agreement and the 
other Loan Documents to which the Borrower or such Guarantor is or is to 
become a party and the transactions contemplated hereby and thereby do not 
require the approval or consent of, or filing with, any governmental agency 
or authority other than those already obtained and the filing of the Security 
Documents in the appropriate records office with respect thereto.

     Section 6.3. Title to Properties.

     (a) Based on the Title Policies, the Borrower or one of the Guarantor
Subsidiaries holds good and clear record and marketable fee simple title to the
Mortgaged Properties, subject to no Liens or encumbrances except for the
Permitted Liens.

     (b) Except as indicated on Schedule 6.3 hereto, the Borrower or the Related
Companies own all of the properties reflected in the Closing Balance Sheet of
the Company, subject to no Liens except Permitted Liens.

     Section 6.4. Financial Statements. The following financial statements 
have been furnished to each of the Lenders.

     (a) The Prospectus Financial Statements. Such Prospectus Financial
Statements have been prepared in accordance with Generally Accepted Accounting
Principles and fairly present the financial condition of the Borrower and the
Company as at the close of business on 

                                       37
<PAGE>

the Effective Date and the results of operations for the applicable period.
There are no direct or contingent liabilities of the Borrower or the Company as
of such date involving material amounts, known to the officers of the Company
not disclosed in the Closing Balance Sheet of the Company contained in the
Prospectus Financial Statements and the related notes thereto. There are no
material differences between the Closing Balance Sheet and balance sheet of the
Borrower and its subsidiaries prepared on a consolidated basis in accordance
with Generally Accepted Accounting Principles prepared on the same basis and as
of the same date as the Closing Balance Sheet, other than the line item for the
minority interests in the Borrower.

     (b) With respect to each Mortgaged Property, a statement prepared by the
Borrower of the rental and other income of the Borrower from the operation of
such Mortgaged Property for each of the previous four (4) fiscal quarters, and
all operating and other costs and expenses incurred by the Borrower in
connection with such Mortgaged Property during such fiscal quarters, certified
by a Responsible Officer of the Company as fairly presenting the results of
operation with respect to such Mortgaged Property for such fiscal period.

     Section 6.5. No Material Changes, Etc. The Formation Transactions and 
all other events which are the basis for the assumptions used in preparation 
of the Closing Balance Sheet have happened or will happen on the Effective 
Date. Since the time of preparation of the Closing Balance Sheet, there has 
occurred no material adverse change in the financial condition or assets or 
business of the Borrower as shown on or reflected on the Closing Balance 
Sheet, nor has there been any material increase in the liabilities of the 
Borrower or the Company in excess of those shown thereon other than changes 
in the ordinary course of business that have not had any Material Adverse 
Effect either individually or in the aggregate.

     Section 6.6. Franchises, Patents, Copyrights, Etc. The Borrower 
possesses all franchises, patents, copyrights, trademarks, trade names, 
licenses and permits, and rights in respect of the foregoing, adequate for 
the conduct of its business substantially as now conducted without known 
conflict with any rights of others, including all Permits except to the 
extent the Borrower's failure to possess the same does not have a Material 
Adverse Effect.

     Section 6.7. Litigation. Except as listed and described on Schedule 6.7 
hereto, there are no actions, suits, proceedings or investigations of any 
kind pending or, to Borrower's knowledge, threatened against the Borrower, 
the Company, any Guarantor or any of the Related Companies before any court, 
tribunal or administrative agency or board that, if adversely determined, are 
reasonably expected to, either in any case or in the aggregate, have a 
Material Adverse Effect or materially impair the right of the Borrower, the 
Company, any Guarantor or any of the Related Companies to carry on business 
substantially as now conducted by it, or which question the validity of this 
Agreement or any of the other Loan Documents, any action taken or to be taken 
pursuant hereto or thereto, or any Lien or security interest created or 
intended to be created pursuant hereto or thereto, or which will materially 
adversely affect the ability of the Borrower 

                                       38
<PAGE>


or any Guarantor to pay and perform the Obligations in the manner contemplated 
by this Agreement and the other Loan Documents.

     Section 6.8. No Materially Adverse Contracts, Etc. The Borrower is not 
subject to any charter, trust or other legal restriction, or any judgment, 
decree, order, rule or regulation that has or is expected in the future, in 
the judgment of the Company's officers, to have a Material Adverse Effect. 
The Borrower is not a party to any contract or agreement that has or is 
expected, in the judgment of the Company's officers, to have any Material 
Adverse Effect. The Company is not subject to any charter, trust or other 
legal restriction, or any judgment, decree, order, rule or regulation that 
has or is expected in the future, in the judgment of the Company's officers, 
to have a Material Adverse Effect. The Company is not a party to any contract 
or agreement that has or is expected, in the judgment of the Company's 
officers, to have any Material Adverse Effect.

     Section 6.9. Compliance With Other Instruments, Laws, Etc. Neither the 
Borrower nor the Company is in violation of any provision of the Borrower's 
partnership agreement, the partnership agreement of any of the Guarantor 
Subsidiaries or of the Company's declaration of trust, by-laws, or any 
agreement or instrument to which it may be subject or by which the Borrower 
or any of its properties may be bound or any decree, order, judgment, 
statute, license, rule or regulation, in any of the foregoing cases in a 
manner that could result in the imposition of substantial penalties or have a 
Material Adverse Effect.

     Section 6.10. Tax Status. Each of the Guarantor Subsidiaries (a) has 
made or filed all federal and state income and all other tax returns, reports 
and declarations required by any jurisdiction to which it is subject, and (b) 
has paid all taxes and other governmental assessments and charges shown or 
determined to be due on such returns, reports and declarations, except those 
being contested in good faith and by appropriate proceedings. There are no 
unpaid taxes in any material amount claimed to be due by the taxing authority 
of any jurisdiction, and the officers of the Company know of no basis for any 
such claim.

     Section 6.11. Event of Default. No Default or Event of Default has 
occurred and is continuing.

     Section 6.12. Investment Company Act. The Borrower is not an "investment 
company", or an "affiliated company" or a "principal underwriter" of an 
"investment company", as such terms are defined in the Investment Company Act 
of 1940.The Company is not an "investment company", or an "affiliated 
company" or a "principal underwriter" of an "investment company", as such 
terms are defined in the Investment Company Act of 1940.

     Section 6.13. Absence of Financing Statements, Etc. There is no 
financing statement, security agreement, chattel mortgage, real estate 
mortgage, equipment lease, financing lease, option, encumbrance or other 
document existing, filed or recorded with any filing records, registry, or 
other public office, that purports to cover, affect or give notice of any 
present or possible future 

                                       39
<PAGE>


Lien or encumbrance on, or security interest in, any Collateral, except those in
favor of the Agent or Permitted Liens.

     Section 6.14. Setoff, Etc. The Collateral and the Agent's rights with 
respect to the Collateral are not subject to any setoff, claims, withholdings 
or other defenses. Either the Borrower or a Guarantor is the owner of the 
Collateral free from any lien, security interest, encumbrance and any other 
claim or demand, except for the Permitted Liens.

     Section 6.15. Certain Transactions. Except as disclosed in the Equity 
Prospectus, none of the officers or employees of the Borrower, the Company or 
any Guarantor are presently a party to any transaction with the Borrower, the 
Company or any Guarantor (other than for services as employees, officers and 
trustees), including any contract, agreement or other arrangement providing 
for the furnishing of services to or by, providing for rental of real or 
personal property to or from, or otherwise requiring payments to or from any 
officer, trustee or such employee or, to the knowledge of the Borrower and 
the Company, any corporation, partnership, trust or other entity in which any 
officer, trustee or any such employee or natural Person related to such 
officer, trustee or employee or other Person in which such officer, trustee 
or employee has a direct or indirect beneficial interest has a substantial 
interest or is an officer or trustee.

     Section 6.16. Benefit Plans: Multiemployer Plans: Guaranteed Pension 
Plans. As of the date hereof as to any Employee Benefit Plan, Multiemployer 
Plan or Guaranteed Pension Plan, neither the Borrower nor any ERISA Affiliate 
maintains or contributes to any Employee Benefit Plan, Multiemployer Plan or 
Guaranteed Pension Plan. To the extent that Borrower, the Company or any 
ERISA Affiliate hereafter maintains or contributes to any Employee Benefit 
Plan or Guaranteed Pension Plan, it shall at all times do so in compliance 
with Section 7.18 hereof.

     Section 6.17. Regulations U and X. No portion of any Loan is to be used 
for the purpose of purchasing or carrying any "margin security" or "margin 
stock" as such terms are used in Regulations U and X of the Board of 
Governors of the Federal Reserve System, 12 C.F.R. Parts 221 and 224.

     Section 6.18. Environmental Compliance. The Borrower has delivered to 
the Agent the Environmental Reports with respect to the Mortgaged Properties 
which are listed on Schedule 6.18. Except as may be set forth in the 
Environmental Reports with respect to the Mortgaged Properties, or as 
described on Schedule 6.18 or in the Equity Prospectus with respect to the 
other Real Estate Assets, Borrower makes the following representations and 
warranties:

     (a) To the best of Borrower's knowledge, none of the Borrower, any
Guarantor, any of the Related Companies or any operator of the Real Estate or
any portion thereof, or any operations thereon is in violation, or alleged
material violation, of any judgment, decree, order, law, license, rule or
regulation pertaining to environmental matters, including without limitation,
those arising under the Resource Conservation and Recovery Act ("RCRA"), the
Comprehensive 

                                       40
<PAGE>


Environmental Response, Compensation and Liability Act of 1980 as amended
("CERCLA"), the Superfund Amendments and Reauthorization Act of 1986 ("SARA"),
the Federal Clean Water Act, the Federal Clean Air Act, the Toxic Substances
Control Act, or any state or local statute, regulation, ordinance, order or
decree relating to health, safety or the environment, including, without
limitation, the environmental statutes, regulations, orders and decrees of the
States in which any of the Real Estate may be located (hereinafter collectively
referred to as the "Environmental Laws"), which violation either involves the
Mortgaged Properties or would have a Material Adverse Effect.

     (b) None of the Borrower, Prime, the Guarantors or the Related Companies 
has received written notice from any third party including, without 
limitation any federal, state or local governmental authority with respect to 
any of the Mortgaged Properties, or with respect to any other Real Estate if 
the same would have a Material Adverse Effect, (i) that it has been 
identified by the United States Environmental Protection Agency ("EPA") as a 
potentially responsible party under CERCLA with respect to a site listed on 
the National Priorities List, 40 C.F.R. Part 300 Appendix B (1986); (ii) that 
any hazardous waste, as defined by 42 U.S.C. Section 9601(5), any hazardous 
substances as defined by 42 U.S.C. Section 9601(14), any pollutant or 
contaminant as defined by 42 U.S.C. Section 9601(33) or any toxic substances, 
oil or hazardous materials or other chemicals or substances regulated by any 
Environmental Laws ("Hazardous Materials") which it has generated, 
transported or disposed of have been found at any site at which a federal, 
state or local agency or other third party has conducted or has ordered that 
the Borrower, any Guarantor or any of the Related Companies conduct a 
remedial investigation, removal or other response action pursuant to any 
Environmental Law; or (iii) that it is or shall be a named party to any 
claim, action, cause of action, complaint, or legal or administrative 
proceeding (in each case, contingent or otherwise) arising out of any third 
party's incurrence of costs, expenses, losses or damages of any kind 
whatsoever in connection with the release of Hazardous Materials.

     (c) (i) To the best of Borrower's knowledge no portion of the Real Estate
has been used for the handling, processing, storage or disposal of Hazardous
Materials except in material compliance with applicable Environmental Laws; and
no underground tank or other underground storage receptacle for Hazardous
Materials is located on any portion of the Real Estate except in material
compliance with applicable Environmental Laws; (ii) to the best of Borrower's
knowledge, in the course of any activities conducted by the Borrower, any
Guarantor, any of the Related Companies or the operators of any Real Estate, any
ground or space tenants on any Real Estate, no Hazardous Materials have been
generated or are being used on the Real Estate except in material compliance
with applicable Environmental Laws, which in the case of Real Estate other than
the Mortgaged Properties would have a Material Adverse Effect; (iii) there has
been no present, or to the best of Borrower's knowledge past, releasing,
spilling, leaking, pumping, pouring, emitting, emptying, discharging, injecting,
escaping, disposing or dumping (a "Release") or threatened Release of Hazardous
Materials on, upon, into or from the Mortgaged Properties or the other Real
Estate, which Release in the case of Real Estate other 

                                       41
<PAGE>


than the Mortgaged Properties would have a Material Adverse Effect and; (iv) 
to the best of Borrower's knowledge, there have been no Releases on, upon, 
from or into any real property in the vicinity of any of the Real Estate 
which, through soil or groundwater contamination, may have come to be located 
on, and which would have a Material Adverse Effect; and (v) notwithstanding 
that any representation contained herein may be limited to the knowledge of 
the Borrower, any such limitation shall not affect the covenants specified in 
Section 7.10 or elsewhere in this Agreement.

     Section 6.19. Subsidiaries and Affiliates. The Borrower has no 
Subsidiaries except for the Related Companies listed on Schedule 1.3 and does 
not have an ownership interest in any entity whose financial statements are 
not consolidated with the Borrower's except for the Permitted Joint Ventures 
listed on Schedule 1.3. The Company is not a partner in any partnership other 
than Borrower and certain of the Related Companies listed on Schedule 1.3 
which are limited partnerships in which the Company has a one tenth percent 
(0.1%) limited partnership interest, has no Investments in any Person other 
than the Borrower and such limited partnerships and is not a member of any 
limited liability company. The Company owns no material assets other than its 
partnership interest in Borrower and the limited partnership interests 
described in this Section 6.19.

     Section 6.20. Major Leases. The Borrower has delivered to the Agent 
complete copies of the Major Leases and of the other Leases requested by the 
Agent.

     Section 6.21. Loan Documents. All of the representations and warranties 
of the Borrower or any Guarantor made in the other Loan Documents or any 
document or instrument delivered or to be delivered to the Agent or the 
Lenders pursuant to or in connection with any of such Loan Documents are true 
and correct in all material respects.

     Section 6.22. Mortgaged Properties. In this Section 6.22 the phrase "to 
the Borrower's knowledge" shall mean the actual knowledge of the officers and 
employees of the Company or of Prime who have had significant responsibility 
for the operation, management and leasing of the applicable Mortgaged 
Property. The Borrower makes the following additional representations and 
warranties concerning the Mortgaged Properties:

     (a) Off-Site Utilities. All water, sewer, electric, gas, telephone and
other utilities are installed to the property lines of the Mortgaged Properties
and, except in the case of drainage facilities, are connected to the Buildings
located thereon and to the Borrower's knowledge are adequate to service the
Buildings in full compliance with applicable law; and to the Borrower's
knowledge the Buildings are properly and legally connected directly to public
water and sewer systems. No easements over land of others not yet obtained are
required for any such utilities, and no drainage of surface or other water
across land of others is required except as disclosed in the Surveys.

                                       42
<PAGE>

     (b) Surveys, Access; Etc. Since the date of the most recent Survey
delivered to the Agent with respect to each Mortgaged Property, there has been
no construction (except interior renovations and improvements) of additional
Buildings or additions to Buildings on such Mortgaged Property, and to the
Borrower's knowledge no takings by eminent domain affecting such Mortgaged
Property or other changes which may have caused such Survey to be no longer
accurate.

     (c) Independent Building. The Buildings on each Mortgaged Property (except
as described in documents referred in the Title Policy for the West Wacker Drive
Property with respect to walkways and other common areas shared by such property
with other buildings) are fully independent from any other real estate in all
respects including, without limitation, in respect of structural integrity,
heating, ventilating and air conditioning, plumbing, mechanical and other
operating and mechanical systems, and electrical, sanitation and water systems,
all of which are connected directly to off-site utilities located in public
streets or ways. Each Mortgaged Property consists of one or more lots which are
not assessed for purposes of real estate tax assessment and payment jointly with
any land which is not a part of such Mortgaged Property. The Buildings, all
Building Service Equipment and all paved or landscaped areas related to or used
in connection with the Buildings are located wholly within the perimeter lines
of the lot or lots on which the Mortgaged Properties are located except as
disclosed in the Surveys.

     (d) Condition of Building; No Asbestos. Except as set forth in the
engineering reports provided to the Agent and listed on Schedule 6.22(d), to the
Borrower's knowledge there are no material defects in the roof, foundation,
structural elements and masonry walls of the Buildings or their heating,
ventilating and air conditioning, electrical, sprinkler, plumbing or other
mechanical systems or their Building Service Equipment; the Buildings are fully
sprinkled; and no friable asbestos is located in or on the Buildings except as
may be disclosed in the Environmental Reports.

     (e) Building Compliance with Law; Permits. The Buildings as presently
constructed and used do not, to the Borrower's knowledge, violate any applicable
federal or state law or governmental regulation, or any local ordinance, order
or regulation, including but not limited to laws, regulations, or ordinances
relating to zoning, building use and occupancy, subdivision control, fire
protection, health and sanitation. To the Borrower's knowledge, all Permits
required for the operation and maintenance of the Mortgaged Properties,
including without limitation, building permits, curb-cut permits, water
connection permits, sewer extension or connection permits and other permits
relating to the use of utilities, and permits required under the Federal Clean
Air Act, as amended, the Federal Clean Water Act, as amended (including, without
limitation a so-called Section 404 Permit"), and by state law or regulations
consistent with the requirements of said Acts, have been validly issued by the
appropriate governmental Persons and are now in full force and effect.

                                       43
<PAGE>


     (f) No Required Real Property Consents, Permits, Etc. The Borrower has
received no notices of, nor has any knowledge of, any Permits, utility
installations and connections (including, without limitation, drainage
facilities, curb cuts and street openings), or private consents required for the
maintenance, operation, servicing and use of the Mortgaged Properties for their
current use which have not been granted, effected, or performed and completed
(as the case may be) or any fees or charges therefor which have not been fully
paid provided, however, that certain Permits may require periodic renewals.

     (g) Suits; Judgments. To the Borrower's knowledge, there are no outstanding
notices, suits, orders, decrees or judgments relating to zoning, building use
and occupancy, subdivision control, fire protection, health, sanitation, or
other violations affecting, against, or with respect to, the Mortgaged
Properties or any part thereof, other than suits, orders, decrees or judgments
against tenants or former tenants with respect to defaults by such tenants under
their Leases or evicting or otherwise obtaining possession of the premises
occupied by such tenants.

     (h) Insurance. None of the Guarantors, the Company or the Borrower has
received any written notices from any insurer or its agent requiring performance
of any material work with respect to the Mortgaged Properties or canceling or
threatening to cancel any policy of insurance.

     (i) Real Property Taxes; Special Assessments. Based on the Title Policies,
there are no unpaid or outstanding real estate or other taxes or assessments on
or against the Mortgaged Properties or any part thereof which are payable by
Borrower or tenants (except only real estate taxes and assessments not yet due
and payable). Except as disclosed on the Title Policies, and to the Borrower's
knowledge there are no betterment assessments or other special assessments
presently pending with respect to any portion of the Mortgaged Properties, and
Borrower has received no notice of any such special assessment being
contemplated.

     (j) Historic Status. To the Borrower's knowledge, the Buildings are not
historic structures or landmarks, and the Mortgaged Properties are not within
any historic district pursuant to any federal, state or local law or
governmental regulation.

     (k) Domain. To the Borrower's knowledge, there are no pending eminent
domain proceedings against the Mortgaged Properties or any part thereof, and no
such proceedings are presently threatened or contemplated by any taking
authority.

     (l) Leases. A rent roll with respect to all Leases of any portion of the
Mortgaged Properties (current as of the date set forth thereon) is accurate and
completely set forth in Schedule 6.22(1) as the same shall be supplemented each
fiscal quarter by a certificate signed by an authorized officer of Borrower. The
Leases reflected on such rent roll constitute the sole and complete agreements
and understandings relating to leasing or licensing of space in the Buildings or
otherwise at the Mortgaged Properties. The Borrower has delivered to the Agent a

                                       44
<PAGE>

true and complete copy of all Major Leases. There are no occupancies, rights,
privileges or licenses in or to the Buildings or any other part of the Mortgaged
Properties other than pursuant to the Leases reflected on the rent roll set
forth in Schedule 6. 22(1). Except as set forth in Schedule 6.22(1) the Leases
reflected on the Schedule 6.22(1) rent roll are in full force and effect, in
accordance with their respective terms, without any payment default or any other
material default thereunder, nor to the Borrower's knowledge, are there any
defenses, counterclaims, offsets, concessions or rebates available to any tenant
thereunder, and the Mortgagor has not given or made, or received, any notice of
default, or any material claim, which remains uncured or unsatisfied, with
respect to any of the Major Leases and, to the best of the Borrower's knowledge
there is no basis for any such claim or notice of default by any tenant. The
Schedule 6.22(1) rent roll accurately and completely sets forth all rents
payable by tenants, no tenant having paid more than one month's rent in advance.
All tenant improvements or work to be done, furnished or paid for by the
landlord, or credited or allowed to a tenant, for, or in connection with, the
Buildings pursuant to any Lease has been completed and paid for, or provided for
in a manner satisfactory to the Agent, or will be paid for by the Borrower in
the ordinary course of the Borrower's business. No leasing, brokerage or like
commissions, fees or payments are due from the Borrower in respect of the
Leases, or will be paid for by the Borrower in the ordinary course of the
Borrower's business. Except as set forth on the Schedule 6.22(1) rent roll, all
tenants under all Leases are in occupancy and operating the premises covered by
such Leases within the permitted uses under such Leases.

     (m) Service Agreements. Except as listed on Schedule 6.22 (m), there are no
Service Agreements relating to the operation and maintenance of the Mortgaged
Properties or any part thereof except Service Agreements which may be terminated
at the owner's option upon not more than 60 days advance notice. To the best of
Borrower's knowledge, no default notices have been given by any party to any
Service Agreement.

     (n) Other Material Real Property Agreements; No Options. Except as listed
on Schedule 6.22(n), there are no material agreements pertaining to the
Mortgaged Properties or the operation or maintenance thereof other than as
described in this Agreement (including the Schedules hereto) or otherwise
disclosed in writing to the Agent by the Borrower, and no person or entity has
any right or option to acquire any of the Mortgaged Properties or any portion
thereof or interest therein or lease any portion thereof or additional portion
thereof or provide services thereat.

     Section 7. AFFIRMATIVE COVENANTS OF THE BORROWER. The Borrower covenants 
and agrees as follows, and to the extent that the following covenants relate 
to the Company, the Company covenants and agrees as follows, so long as any 
Loan, Note or Letter of Credit is outstanding or the Lenders have any 
obligations to make Loans or issue Letters of Credit:

                                       45
<PAGE>

     Section 7.1. Punctual Payment. The Borrower will unconditionally duly 
and punctually pay the principal and interest on the Loans and all other 
amounts provided for in the Note, this Agreement, and the other Loan 
Documents all in accordance with the terms of the Note, this Agreement and 
the other Loan Documents.

     Section 7.2. Maintenance of Office. Each of the Borrower and the Company 
will maintain its chief executive office in Chicago, Illinois or at such 
other place in the United States Of America as the Borrower or the Company 
shall designate upon written notice to the Agent to be delivered within 
fifteen (15) days of such change, where notices, presentations and demands to 
or upon the Borrower or the Company in respect of the Loan Documents may be 
given or made.

     Section 7.3. Records and Accounts. Each of the Borrower and the Company 
will keep true and accurate records and books of account in which full, true 
and correct entries will be made in accordance with Generally Accepted 
Accounting Principles.

     Section 7.4. Financial Statements, Certificates and Information. The 
Borrower will deliver to each of the Lenders:

     (a) as soon as practicable, but in any event not later than ninety (90)
days after the end of each fiscal year of the Borrower, the audited balance
sheet of the Borrower and of the Company at the end of such year, and the
related audited statement of income, statement of changes in shareholders,
equity and statement of Funds From Operations and taxable income for such year,
each setting forth in comparative form the figures for the previous fiscal year
and all such statements to be in reasonable detail, prepared in accordance with
Generally Accepted Accounting Principles on a consolidated basis including the
Borrower, the Company and the Related Companies, and accompanied by an auditor's
report prepared without qualification by Ernst & Young LLP or by another
independent certified public accountant reasonably acceptable to the Agent;

     (b) as soon as practicable, but in any event not later than forty-five (45)
days after the end of each fiscal quarter of the Borrower, copies of the
unaudited balance sheets of the Borrower as at the end of such quarter, and the
related unaudited statement of income, statement of changes in shareholders'
equity and statement of Funds From Operations and estimated taxable income for
the portion of the Borrower's fiscal year then elapsed, all in reasonable detail
and prepared in accordance with Generally Accepted Accounting Principles,
together with a certification by the principal financial or accounting officer
of the Company that the information contained in such financial statements
fairly presents the financial position of the Borrower and of the Company on the
date thereof (subject to year-end adjustments), provided, however, that such
information with respect to the quarter ended September 30, 1997 shall be
delivered by December 29, 1997;

                                       46
<PAGE>


     (c) as soon as practicable, but in any event not later than forty-five 
(45) days after the end of each of the fiscal quarters of the Borrower, 
copies of a statement of the Net Operating Income for such fiscal quarter for 
each Mortgaged Property, and a consolidating statement of the Net Operating 
Income for such fiscal quarter for all of the Mortgaged Properties, prepared 
on a basis consistent with the statements furnished pursuant to Section 6.4 
(b), and certified by a Responsible Officer of the Company;

     (d) as soon as practicable, but in any event no later than forty-five (45)
days after the end of each fiscal quarter of the Borrower, the Borrower will
provide the Agent with , a rent roll for each of the Mortgaged Properties, and a
consolidated rent roll for all of the Mortgaged Properties, each dated as of the
end of such fiscal quarter in form reasonably satisfactory to the Agent;

     (e) simultaneously with the delivery of the financial statements referred
to in subsections (a) and (b) above, a statement in the form of Exhibit C hereto
signed by a Responsible Officer of the Company and setting forth in reasonable
detail computations evidencing compliance with the covenants contained herein
and (if applicable) reconciliations to reflect changes in Generally Accepted
Accounting Principles since the Effective Date;

     (f) as soon as practicable, but in any event not later than ninety (90)
days after the end of each fiscal year of the Company, copies of the Form 10-K
statement filed with the Securities and Exchange Commission ("SEC") for such
fiscal year, and as soon as practicable, but in any event not later than
forty-five (45) days after the end of each fiscal quarter, copies of the Form
10-Q statement filed with the SEC for such fiscal quarter, provided that in
either case if the SEC has granted an extension for the filing of such
statements (or if a later filing is permitted by rule of the SEC with respect to
the fiscal quarter ended September 30. 1997), Borrower shall deliver such
statements to the Agent simultaneously with the filing thereof with the SEC;

     (g) promptly following the filing or mailing thereof, copies of all other
material of a financial nature filed with the SEC or sent to the shareholders of
the Company or to the limited partners of the Borrower and copies of all press
releases (except local press releases relating to specific properties) promptly
upon the issuance thereof;

     (h) from time to time such other financial data and information (including
accountants' management letters) as the Agent may reasonably request;

     Section 7.5. Notices.

     (a) Defaults. The Borrower will promptly notify the Agent in writing of the
occurrence of any Default or Event of Default. If any Person shall give any
notice or take any other action in respect of a claimed default (whether or not
constituting a Default or an Event of Default under this Agreement) under any
note, evidence of Indebtedness, indenture or other

                                       47
<PAGE>


obligation to which or with respect to which the Borrower, the Company, any
Guarantor or any of the Related Companies is a party or obligor, whether as
principal or surety, and if the principal amount thereof exceeds $1,000,000, and
such default would permit the holder of such note or obligation or other
evidence of Indebtedness to accelerate the maturity thereof, the Borrower shall
forthwith give written notice thereof to the Agent and each of the Lenders,
describing the notice or action and the nature of the claimed default.

     (b) Environmental Events. The Borrower will promptly notify the Agent in
writing of any of the following events: (i) upon Borrower's obtaining knowledge
of any violation of any Environmental Law regarding a Mortgaged Property or any
Real Estate or Borrower's operations which violation could have a Material
Adverse Effect; (ii) upon Borrower's obtaining knowledge of any potential or
known Release, or threat of Release, of any Hazardous Materials at, from, or
into a Mortgaged Property or any Real Estate which it reports in writing or is
reportable by it in writing to any governmental authority and which is material
in amount or nature or which could materially affect the value of such Mortgaged
Property or which could have a Material Adverse Effect; (iii) upon Borrower's
receipt of any notice of violation of any Environmental Laws or of any Release
or threatened Release of Hazardous Materials, including a notice or claim of
liability or potential responsibility from any third party (including without
limitation any federal, state or local governmental officials) and including
notice of any formal inquiry, proceeding, demand, investigation or other action
with regard to (A) Borrower's or any Person's operation of a Mortgaged Property
or any Real Estate if the same would have a Material Adverse Effect, (3)
contamination on, from or into a Mortgaged Property or any Real Estate if the
same would have a Material Adverse Effect, or (C) investigation or remediation
of off-site locations at which Borrower or any of its predecessors are alleged
to have directly or indirectly disposed of Hazardous Materials; or (iv) upon
Borrower's obtaining knowledge that any expense or loss has been incurred by
such governmental authority in connection with the assessment, containment,
removal or remediation of any Hazardous Materials with respect to which
Borrower, Guarantor or any of the Related Companies may be liable or for which a
lien may be imposed on a Mortgaged Property.

     (c) Notification of Liens or other Material Claims. The Borrower will,
immediately upon becoming aware thereof, notify the Agent in writing of any of
any Liens (except Permitted Liens) placed upon or attaching to any Mortgaged
Properties or of any other setoff, claims (including environmental claims),
withholdings or other defenses which could have a Material Adverse Effect.

     (d) Notice of Litigation and Judgments. The Borrower will give notice to
the Agent in writing within fifteen (15) days of becoming aware of any
litigation or proceedings threatened in writing or any pending litigation and
proceedings affecting any of the Mortgaged Properties or affecting the Borrower,
the Company, any Guarantor or any of the Related Companies or to which the
Borrower, the Company, any Guarantor or any of the Related Companies is or is to
become a party involving an uninsured claim (or as to which the insurer 

                                       48
<PAGE>

reserves rights) against the Borrower, the Company, any Guarantor or any of the
Related Companies that at the time of giving of notice could reasonably be
expected to have a Materially Adverse Effect, and stating the nature and status
of such litigation or proceedings. The Borrower will give notice to the Agent,
in writing, in form and detail satisfactory to the Agent, within ten (10) days
of any final judgment not covered by insurance against the Borrower, the
Company, any Guarantor or any of the Related Companies in an amount in excess of
$500,000.

     (e) Notice of Default under Major Leases. The Borrower will immediately
notify the Agent in writing of the occurrence of any failure of any of the Major
Tenants to materially comply with any of the material terms, covenants,
conditions or agreements under any of the Major Leases.

     (f) Notice of Equity Prospectus Amendment. The Company will promptly notify
the Lenders of any further amendment to the Equity Prospectus, which notice
shall include a copy of any such amendment.

     (g) Notice of Expected Receipt of Net Offering Proceeds. At least three (3)
Business Days prior to the date on which the Company or the Borrower expects to
receive Net Offering Proceeds, the Borrower or the Company, as applicable will
notify the Agent of the expected amount of Net Offering Proceeds and the
expected date of receipt thereof and shall immediately notify the Agent of any
changes in the information set forth in such notice.

     Section 7.6. Existence; Maintenance of REIT Status; Maintenance of 
Properties. The Company will do or cause to be done all things necessary to 
preserve and keep in full force and effect its existence as a Maryland trust 
and its status as a self administered real estate investment trust under the 
Code, the existence of Borrower as a Delaware limited partnership and the 
existence of each Guarantor Subsidiary. The Borrower will do or cause to be 
done all things necessary to preserve and keep in full force all of its 
rights and franchises which in the judgment of the Borrower may be necessary 
to properly and advantageously conduct the businesses being conducted by it, 
the Company or any of the Related Companies. The Borrower (a) will cause all 
of the properties used or useful in the conduct of the business of Borrower, 
the Company or any of the Related Companies to be maintained and kept in good 
condition, repair and working order, subject to ordinary wear and tear, and 
supplied with all necessary equipment, (b) will cause to be made all 
necessary repairs, renewals, replacements, betterments and improvements 
thereof, all as in the judgment of the Borrower may be necessary so that the 
business carried on in connection therewith may be properly and 
advantageously conducted at all times, and (c) will continue to engage 
primarily in the businesses now conducted by it and in related businesses.

     Section 7.7. Insurance. The Borrower will maintain insurance on the 
Mortgaged Properties as required by the Security Deeds. With respect to other 
properties and businesses of Borrower, the Guarantors and the Related 
Companies, the Borrower will maintain or cause to be maintained insurance 
with financially sound and reputable insurers against such casualties and 
contingencies 

                                       49
<PAGE>


in amounts, containing such terms, in such forms and for such periods as may be
reasonable and prudent in the judgment of the Company's officers.

     Section 7.8. Taxes. The Borrower will pay real estate taxes, other 
taxes, assessments and other governmental charges against the Mortgaged 
Properties before the same become delinquent, and will duly pay and 
discharge, or cause to be paid and discharged, before the same shall become 
overdue, all taxes, assessments and other governmental charges imposed upon 
it and its other properties, sales and activities, or any part thereof, or 
upon the income or profits therefrom, as well as all claims for labor, 
materials, or supplies that if unpaid might by law become a lien or charge 
upon any of its properties; provided that any such tax, assessment, charge, 
levy or claim with respect to properties other than the Mortgaged Properties 
need not be paid if the validity or amount thereof shall currently be 
contested in good faith by appropriate proceedings and if the Borrower shall 
have set aside on its books adequate reserves with respect thereto; and 
provided further that the Borrower will pay all such taxes, assessments, 
charges, levies or claims forthwith upon the commencement of proceedings to 
foreclose any lien that may have attached as security therefor. Promptly 
after payment of real estate taxes, other taxes, assessments and other 
governmental charges against the Mortgaged Properties, Borrower will provide 
evidence of such payments to the Agent, in the form of receipted tax bills or 
other form reasonably acceptable to the Agent. Notwithstanding anything 
contained herein to the contrary, with respect to the Mortgaged Properties, 
Borrower, after receipt of notice from the Agent (which notice may be given 
by the Agent at any time after the occurrence of an Event of Default) , shall 
deposit with Agent, on the first day of each month thereafter, a sum 
determined by Agent to be sufficient to provide, in the aggregate, a fund 
adequate to pay all real estate taxes, other taxes, assessments and other 
governmental charges against the Mortgaged Properties at least ten (10) days 
before the same becomes delinquent; and whenever the Agent determines sums 
accumulated under such escrow to be insufficient to meet the obligations for 
which such deposits were made, the Borrower shall pay, on the demand of the 
Agent, any amount required to cover the deficiency therein.

     Section 7.9. Inspection of Properties and Books; Confidential 
Information. The Borrower shall permit the Lenders, through the Agent or any 
of the Lenders' other designated representatives, to visit and inspect any of 
the Mortgaged Properties, to examine the books of account of the Borrower, 
the Company and the Related Companies (and to make copies thereof and 
extracts therefrom) and to discuss the affairs, finances and accounts of the 
Borrower with, and to be advised as to the same by, its officers, all at such 
reasonable times and intervals as the Agent or any Lender may reasonably 
request. Each Lender understands that in the course of its exercise of its 
rights set forth herein, the Lender may obtain information relating to 
Borrower or the Company or a Property which is of a confidential nature (the 
"Confidential Information"). Each Lender agrees that it will not, at any 
time, divulge, publish or disclose, or authorize or permit any other person 
to divulge, publish or disclose, to any Person, any of the Confidential 
Information, provided, however, that the Confidential Information may be 
disclosed by any Lender (a) to its officers, attorneys, and accountants, (b) 
to any regulator or other governmental 

                                       50
<PAGE>


agency with supervisory authority over the business of such Lender, (c) to any
other Person to the extent required by applicable law or regulation, and (d) to
the extent that such Confidential Information is otherwise publicly available
from sources other than such Lender.

     Section 7.10. Compliance with Laws, Contracts, Licenses, and Permits. 
The Borrower will comply in all material respects, the Company will comply in 
all material respects and the Borrower will cause each Guarantor and all 
Related Companies to comply in all material respects, with (a) all applicable 
laws and regulations now or hereafter in effect wherever its business is 
conducted, including all Environmental Laws, (b) the provisions of all 
applicable partnership agreements, charter documents and by-laws, (c) all 
agreements and instruments to which it is a party or by which it or any of 
its Real Estate Assets may be bound including the Leases, and (d) all 
applicable decrees, orders, and judgments.

     Section 7.11. Use of Proceeds. Subject to the provisions of Section 2.5 
hereof, the proceeds of the Loans shall be used by the Borrower for Permitted 
Acquisitions and Permitted Developments, for refinancing other Indebtedness, 
and for working capital and other purposes consistent with the covenants 
contained herein.

     Section 7.12. Appraisals. The Appraised Values of the Mortgaged 
Properties, including the Appraised Values of Additional Properties 
determined pursuant to Appraisals approved by the Requisite Lenders pursuant 
to Section 10.14 and Section 5.4(b), may increase or decrease only upon the 
approval by the Lead Lenders of a new or updated Appraisal of such Mortgaged 
Property. The Agent shall order a new or updated Appraisal of a Mortgaged 
Property (i) promptly following a written request from the Borrower, (ii) in 
the discretion of the Agent if the occupied percentage of the gross leasable 
area of the Buildings on such Mortgaged Property for two (2) consecutive 
fiscal quarters is more than 20 percentage points lower than the occupancy 
percentage shown on the rent roll for such Mortgaged Property attached as 
Schedule 6.22(l) hereto, (iii) if, in the Agent's opinion, there has been a 
substantial adverse change in market conditions; (iv) as may be required by 
regulatory requirements applicable to any Lender; and (v) following an Event 
of Default, if requested by any Lender. The Borrower shall provide to the 
Agent all available information needed to assist in the preparation of an 
Appraisal and shall pay to the Agent on demand all reasonable costs of all 
such Appraisals.

     Section 7.13. Leases; Lease Approvals. The Borrower will not include in 
any Leases any purchase option or right of first refusal to purchase any 
Mortgaged Property. The Borrower will at all times exercise or enforce its 
material rights under the Leases. During the continuance of an Event of 
Default, the Agent shall have the right, and the Borrower hereby authorizes 
the Agent, to communicate directly with any of the tenants or guarantors for 
any purpose contemplated by this Agreement or any of the Security Documents. 
Any proposed lease which would be a Major Lease shall be submitted to and 
approved by the Lead Lenders prior to execution, along with the most recent 
financial statements of such proposed tenant and any guarantor. The Borrower 
will not materially adversely amend, terminate, or accept a surrender of any 
Major Lease or release 

                                       51
<PAGE>


any Major Tenant or waive the material performance of a Major Lease by a Major
Tenant, in each case without prior approval of the Lead Lenders. The Lead
Lenders shall not unreasonably withhold their approval of any Major Lease or
amendment thereof. If the Lead Lenders fail to respond within five (5) Business
Days after receipt of any proposed Major Lease or amendment of a Major Lease,
the same shall be deemed to be approved.

     Section 7.14. Further Assurance. The Borrower will cooperate with the 
Agent and the Lenders and execute such further instruments and documents and 
perform such further acts as the Agent and the Lenders shall reasonably 
request to carry out to their satisfaction the transactions contemplated by 
this Agreement and the other Loan Documents and the granting and perfecting 
of all liens in the Collateral for the benefit of the Agent as agent for the 
Lenders.

     Section 7.15. Environmental Indemnification. Each of the Borrower and 
the Company, jointly and severally, covenants and agrees that it will 
indemnify and hold the Agent and each Lender harmless from and against any 
and all claims, expense, damage, loss or liability incurred by the Agent or 
any Lender (including all reasonable costs of legal representation incurred 
by the Agent or any Lender , but excluding, as applicable, for the Agent or a 
Lender any claim, expense, damage, loss or liability as a result of the gross 
negligence or willful misconduct of the Agent or such Lender ) relating to 
(a) any Release or threatened Release of Hazardous Materials on, upon, into 
or from any Mortgaged Property or any Real Estate; (b) any violation of any 
Environmental Laws with respect to conditions at any Mortgaged Property or 
the operations conducted thereon; or (c) the investigation or remediation of 
off-site locations at which the Borrower or its predecessors are alleged to 
have directly or indirectly disposed of Hazardous Materials. It is expressly 
acknowledged by the Borrower that this covenant of indemnification shall 
survive any foreclosure or any modification, release or discharge of any or 
all of the Security Documents or the payment of the Loans and shall inure to 
the benefit of the Agent and the Lenders, and their successors and assigns.

     Section 7.16. Response Actions. The Borrower covenants and agrees that 
if any Release or disposal of Hazardous Materials shall occur or shall have 
occurred on, upon, into or from any Mortgaged Property, or on, upon, into or 
from any other Real Estate if the same would have a Material Adverse Effect, 
the Borrower will cause the prompt containment and removal of such Hazardous 
Materials and remediation of such Mortgaged Property or Real Estate as 
necessary to comply in all material respects with all applicable 
Environmental Laws or to preserve the value of such Mortgaged Property.

     Section 7.17. Environmental Assessments. The Borrower shall diligently 
and continuously comply with all recommendations set forth in the 
Environmental Reports, including, without limitation, the completion of the 
remediation projects described therein. Upon written request, the Borrower 
shall provide the Agent with periodic reports with respect to the progress of 
said remediation projects. If the Agent in its good faith judgment, after 
discussion with the Borrower and the Lead Lenders, has reason to believe that 
the environmental condition of any  

                                       52

<PAGE>

Mortgaged Property has deteriorated, after reasonable notice by
the Agent, whether or not a Default or an Event of Default shall have occurred,
the Agent may, from time to time, for the purpose of assessing and ensuring the
value of such Mortgaged Property, obtain one or more environmental assessments
or audits of such Mortgaged Property prepared by a hydrogeologist, an
independent engineer or other qualified consultant or expert approved by the
Agent to evaluate or confirm (i) whether any Hazardous Materials are present in
the soil or water at such Mortgaged Property in such quantities as to require
remediation or clean-up to prevent or mitigate damage or threats to the public
health, safety or welfare or the environment and (ii) whether the use and
operation of such Mortgaged Property complies in all material respects with all
applicable Environmental Laws. Environmental assessments may include without
limitation detailed visual inspections of such Mortgaged Property including,
without limitation, any and all storage areas, storage tanks, drains, dry wells
and leaching areas, and the taking of soil samples, surface water samples and
ground water samples, as well as such other investigations or analyses as the
Agent deems appropriate. All such environmental assessments shall be at the sole
cost and expense of the Borrower; provided, however, the Agent may not require
environmental assessments at the Borrower's expense, with respect to any
Mortgaged Property, more frequently than annually except (i) during the
continuance of an Event of Default or (ii) upon the occurrence of a Release on,
upon, into or from any Mortgaged Property.

     Section 7.18. Employee Benefit Plans.

     (a) Representation. The Borrower and its ERISA Affiliates do not currently
maintain or contribute to any Employee Benefit Plan, Guaranteed Pension Plan or
Multiemployer Plan.

     (b) Notice. The Borrower will notify the Agent promptly following the
establishment of any Employee Benefit Plan or Guaranteed Pension Plan by the
Borrower or any ERISA Affiliate.

     (c) In General. Each Employee Benefit Plan maintained by the Borrower or
any ERISA Affiliate will be operated in compliance in all material respects with
the provisions of ERISA and, to the extent applicable, the Code, including but
not limited to the provisions thereunder respecting prohibited transactions.

     (d) Terminability of Welfare Plans. With respect to each Employee 
Benefit Plan maintained by the Borrower or an ERISA Affiliate which is an 
employee welfare benefit plan within the meaning of Section 3(1) or Section 
3(2)(B) of ERISA, the Borrower, or the ERISA Affiliate, as the case may be, 
has the right to terminate each such plan at any time (or at any time 
subsequent to the expiration of any applicable bargaining agreement) without 
liability other than liability to pay claims incurred prior to the date of 
termination.

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<PAGE>

                  (e) Multiemployer Plans. Without the consent of the Agent, 
the Borrower will not enter into, maintain or contribute to, any 
multiemployer Plan.

                  (f) Unfunded or Underfunded Liabilities. The Borrower will 
not, at any time, have accruing unfunded or underfunded liabilities with 
respect to any Employee Benefit Plan, Guaranteed Pension Plan or 
Multiemployer Plan, or permit any condition to exist under any Multiemployer 
Plan that would create a withdrawal liability.

         Section 7.19. Required Interest Rate Contracts. The Borrower shall 
maintain in effect the Interest Rate Contracts in form and substance 
reasonably satisfactory to the Lead Lenders with respect to that portion of 
the Variable Rate Indebtedness which exceeds, excluding the IRB Indebtedness, 
the principal amount of $125,000,000.

         Section 7.20. Equity Interests in the Company. The Company will 
comply in all material respects with all applicable rules and regulations of 
the Securities Exchange Commission and of relating to its publicly held 
Common Shares and Preferred Shares. The Company will continue to have its 
Common Shares listed on the New York Stock Exchange or on one of the other 
major stock exchanges in the United States, and will comply in all material 
respects with all applicable rules of the stock exchange where the Common 
Shares are so listed. Immediately upon the receipt of any Net Offering 
Proceeds, 100% thereof shall be contributed to the Borrower as an additional 
capital contribution with respect to the Company's general partnership 
interest in the Borrower.

         Section 8. CERTAIN NEGATIVE COVENANTS OF THE BORROWER. The Borrower 
covenants and agrees as follows, and to the extent that the following 
covenants relate to the Company, the Company covenants and agrees as follows, 
so long as any Loan, Note or Letter of Credit is outstanding or the Lenders 
have any obligation to make any Loans or issue any Letters of Credit:

         Section 8.1 Restrictions on Indebtedness. Except with the prior 
written consent of the Requisite Lenders, the Borrower will not, the Company 
will not, and the Borrower will not permit any Guarantor, any of the Related 
Companies or any Permitted Joint Venture to create, incur, assume, guarantee 
or become or remain liable, contingently or otherwise, or agree not to do any 
of same with respect to any Indebtedness other than:

                  (a)  Indebtedness to the Lenders arising under any of the 
Loan Documents;

                  (b) current liabilities of the Borrower incurred in the 
ordinary course of business but not incurred through (i) the borrowing of 
money, or (ii) the obtaining of credit except for credit on an open account 
basis customarily extended and in fact extended in connection with normal 
purchases of goods and services;

                                       54
<PAGE>

                  (c) Indebtedness in respect of taxes, assessments, 
governmental charges or levies and claims for labor, materials and supplies 
to the extent that payment therefor shall not at the time be required to be 
made in accordance with the provisions of Section 7.8;

                  (d) Indebtedness in respect of judgments or awards that 
have been in force for less than the applicable period for taking an appeal 
so long as execution is not levied thereunder or in respect of which the 
Borrower shall at the time in good faith be prosecuting an appeal or 
proceedings for review and in respect of which a stay of execution shall have 
been obtained pending such appeal or review;

                  (e) endorsements for collection, deposit or negotiation and 
warranties of products or services, in each case incurred in the ordinary 
course of business;

                  (f) Indebtedness of Borrower, the Company or the Related 
Companies to the extent the same does not create a violation of Section 9.3, 
Section 9.5 or Section 9.6 provided that the maximum principal amount of 
Recourse Indebtedness permitted under this paragraph shall not exceed 
$50,000,000 in the aggregate at any time outstanding.

         Section 8.2. Restrictions on Liens, Etc. The Borrower will not, and 
will not permit Guarantor, any of the Related Companies or any Permitted 
Joint Venture to, (a) create or incur or agree not to create or incur or 
suffer to be created or incurred or to exist any lien, encumbrance, mortgage, 
pledge, charge, restriction or other security interest of any kind upon any 
of the Mortgaged Property of any character whether now owned or hereafter 
acquired, or upon the rents, income or profits therefrom; (b) suffer to exist 
for a period of more than thirty (30) days after the same shall have been 
incurred any Indebtedness (not permitted by Section 8.1(c)) or claim or 
demand against it that if unpaid might by law or upon bankruptcy or 
insolvency, or otherwise, be given any priority whatsoever over the Security 
Documents; or (c) sell, assign, pledge or otherwise transfer any rents, 
issues, profits, accounts, contract rights or general intangibles relating to 
any of the Mortgaged Premises; provided that the Borrower may create or incur 
or suffer to be created or incurred or to exist:

                  (i) liens to secure taxes, assessments and other 
governmental charges in respect of obligations not overdue, the Indebtedness 
with respect to which is permitted by Section 8.1(c);

                  (ii) deposits or pledges made in connection with, or to 
secure payment of, workmen's compensation, unemployment insurance, old age 
pensions or other social security obligations;

                  (iii) liens in respect of judgments or awards, the 
Indebtedness with respect to which is permitted by Section 8.1(d);

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<PAGE>

                  (iv) liens of carriers, warehousemen, mechanics and 
materialmen, and other like liens on properties other than the Mortgaged 
Properties in existence less than 120 days from the date of creation thereof 
in respect of obligations not overdue, the Indebtedness with respect to which 
is permitted by Section 8.1(c);

                  (v) encumbrances consisting of easements, rights of way, 
covenants, restrictions on the use of real property and defects and 
irregularities in the title thereto; and other minor liens or encumbrances 
none of which in the opinion of the Borrower interferes materially with the 
use of the property affected in the ordinary conduct of the business of the 
Borrower, and which matters (x) do not individually or in the aggregate have 
a materially adverse effect on the value of the Mortgaged Property and (xx) 
do not make title to such property unmarketable by the conveyancing standards 
in effect where such property is located;

                  (vi) the Leases referenced on Schedule 6.22(l) and any 
other Leases permitted by this Agreement or otherwise approved by the Lead 
Lenders;

                  (vii) presently outstanding liens and other encumbrances on 
the Mortgaged Properties listed on Schedule B to the Title Policies; and

                  (viii) liens in favor of the Agent and/or any of the 
Lenders granted pursuant to the Security Documents.

                  (ix) financing statements disclosed by the searches 
described in Section 10.18, provided that to the extent that the Lead Lenders 
may agree that the Borrower will have a certain time period after the 
Effective Date to obtain and file releases or terminations of certain of such 
financing statements, the same shall be Permitted Liens only during such time 
period as the Lead Lenders may so agree.

         Section 8.3. Restrictions on Investments. The Borrower will not, and 
will not permit any Guarantor, any of the Related Companies or any Permitted 
Joint Venture to make or permit to exist or to remain outstanding any 
Investment except Investments in:

                  (a) marketable direct or guaranteed obligations of the 
United States of America that mature within one (1) year from the date of 
purchase by the Borrower;

                  (b) demand deposits, certificates of deposit, repurchase 
agreements, bankers acceptances and time deposits of United States banks 
having total assets in excess of $1,000,000,000;

                  (c) securities commonly known as "commercial paper" issued 
by a corporation organized and existing under the laws of the United States 
of America or any state thereof that at

                                       56
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the time of purchase have been rated and the ratings for which are not less 
than "P 1" if rated by Moody's Investors Services, Inc. , and not less than 
"A 1" if rated by Standard and Poor's;

                  (d) Investments existing or contemplated on the date hereof 
and listed on Schedule 8.3(d) hereto;

                  (e) Investments made in the ordinary course of the 
Borrower's business, in (i) any mortgages the acquisition of which is 
expressly approved by the Lead Lenders, (ii) mortgages and notes receivable 
having an aggregate principal amount, exclusive of any investments in 
mortgages which may have been so expressly approved by the Lead Lenders, of 
not more than $25,000,000, (iii) Permitted Joint Ventures (to the extent 
permitted by Section 8.4(a)), or (iv) Interest Rate Contracts;

                  (f)  Investments in Permitted Acquisitions;

                  (g) Investments in Permitted Developments which shall not 
exceed 20% of Total Adjusted Assets; provided that within said limit any 
single development project with a total cost in excess of $30,000,000 shall 
only be a Permitted Development after it has been approved by the Requisite 
Lenders;

                  (h) Investments in undeveloped land which shall not exceed 
10% of Total Adjusted Assets.

         Section 8.4. Merger, Consolidation and Disposition of Properties.

                  (a) The Borrower will not, and will not permit the Company, 
any of the Related Companies or any Permitted Joint Venture to (i) become a 
party to any merger or consolidation, or (ii) agree to or effect any property 
acquisition or stock acquisition (other than Permitted Acquisitions in 
compliance with the other terms of this Agreement) , or (iii) enter into any 
joint venture or invest in any Permitted Joint Venture unless prior to such 
transaction the Borrower has provided the Lead Lenders with a notice 
describing such transaction, the Borrower shall have obtained the prior 
consent of the Lead Lenders.

                  (b) Real Estate Assets may be sold or transferred except 
that to the extent the aggregate sales price of all such dispositions during 
any fiscal quarter shall exceed $10,000,000, prior to such sale or transfer, 
the Borrower shall provide a statement in the form of Exhibit C hereto signed 
by a Responsible Officer of the Company and setting forth in reasonable 
detail computations evidencing compliance with the financial covenants 
contained in Section 9 after giving effect to such proposed transfer and all 
liabilities, fixed or contingent, pursuant thereto.

         Section 8.5. Sale and Leaseback. The Borrower will not enter into 
any arrangement, directly or indirectly, whereby the Borrower shall sell or 
transfer any property owned by it in order then 

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<PAGE>

or thereafter to lease such property or lease other property that the 
Borrower intends to use for substantially the same purpose as the property 
being sold or transferred. The Borrower will not permit the Company, any of 
the Related Companies or any Permitted Joint Venture to enter into any such 
arrangement.

         Section 8.6. Compliance with Environmental Laws. The Borrower will 
not do, and will not permit the Company, any of the Related Companies or any 
Permitted Joint Venture to do, any of the following: (a) use any of the Real 
Estate or any portion thereof as a facility for the handling, processing, 
storage or disposal of Hazardous Materials except for Hazardous Materials 
used in the operation of the Real Estate and in material compliance with 
applicable law, (b) cause or permit to be located on any of the Real Estate 
any underground tank or other underground storage receptacle for Hazardous 
Materials except in material compliance with Environmental Laws, (c) generate 
any Hazardous Materials on any of the Real Estate except in material 
compliance with Environmental Laws, or (d) conduct any activity at any Real 
Estate or use any Real Estate in any manner so as to cause a Release 
requiring remediation, clean up or other response action under applicable 
Environmental Laws.

         Section 8.7. Distributions. Borrower shall not permit the total 
Distributions by it and the Company during any fiscal year to exceed 90% of 
Funds from Operations for such year and shall not permit there to be more 
than two consecutive fiscal quarters during which the total Distributions by 
Borrower and the Company during each fiscal quarter exceed 100% of Funds from 
Operations for such fiscal quarter except that such limitations may be 
exceeded to the extent necessary for the Company to maintain its REIT status 
provided that the Company provides the Agent with a letter from its 
accountants or attorneys setting forth the basis for computation of the 
amount of such necessary excess Distributions. No Distribution by the 
Borrower to the Company shall be made other than simultaneously with and in 
the same amount as the corresponding Distribution by the Company to the 
owners of the Common Shares and/or the Preferred Shares. During any period 
when Event of Default under Section 12.1(a) or Section 12.1(b) has occurred 
and is continuing total Distributions by the Borrower and the Company will 
not exceed the minimum amount necessary for the Company to maintain its REIT 
status.

         Section 8.8. Leases. The Borrower will not (i) enter into any Major 
Leases or (ii) materially amend, supplement or otherwise materially modify, 
or terminate or cancel, or accept the surrender of, or grant any material 
concessions to or waive the material performance of any of the Major Tenants 
under the Major Leases, in each case without the prior approval of the Lead 
Lenders as provided in Section 7.13.

         Section 8.9. Restrictions on the Company.  The Company will not:

                  (a) own any assets, or have any Investments, other than 
owning its general partnership interest in the Borrower and its limited 
partnership interests described in Section 6.19.

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<PAGE>

                  (b) engage in any business other than its activities as 
managing general partner of the Borrower.

                  (c) directly or indirectly convey, sell, transfer, assign, 
pledge or encumber any of its partnership interest in the Borrower.

                  (d) create, incur, assume, guarantee or become or remain 
liable, contingently or otherwise, any Indebtedness, and any recourse against 
the Company with respect to the Indebtedness of the Borrower shall be limited 
to the same or greater extent as recourse against the Company with respect to 
the Obligations as provided in Section 28.

         Section 9. FINANCIAL COVENANTS OF THE BORROWER. The Borrower 
covenants and agrees as follows, so long as any Loan or Note is outstanding 
or any Lender has any obligation to make any Loan:

         Section 9.1. Collateral Value. The Borrower will not at any time 
permit the Outstanding Principal Amount to exceed sixty percent (60%) of the 
total of the Collateral Values of the Mortgaged Properties.

         Section 9.2. Minimum Debt Service Coverage. The Borrower will not at 
any time permit the Outstanding Principal Amount to exceed an amount such 
that: (a) the aggregate of the Net Operating Income for all of the Mortgaged 
Properties, divided by (b) Pro Forma Debt Service Charges for the Mortgaged 
Properties would be less than 1.5 for any fiscal quarter of Borrower. For 
purposes of the foregoing, any Real Estate Asset that became a Mortgaged 
Property during the applicable fiscal quarter shall be treated as though it 
were a Mortgaged Property for the entire quarter and any Real Estate Asset 
which is released by Agent during such fiscal quarter shall be excluded for 
the entire quarter.

         Section 9.3. Total Liabilities to Total Adjusted Assets. The 
Borrower will not at any time permit Total Liabilities at the end of any 
fiscal quarter to exceed fifty-five percent (55%) of Total Adjusted Assets.

         Section 9.4. Minimum Tangible Net Worth. The Borrower will not at 
any time permit the Tangible Net Worth of the Borrower to be less than 
$350,000,000 plus 75% of Net Offering Proceeds.

         Section 9.5. Total Operating Cash Flow to Interest Expense. The 
Borrower will not permit the ratio of its Total Operating Cash Flow to 
Interest Expense to be less than 2.0 to 1.0 for any fiscal quarter. For the 
fiscal quarter ending December 31, 1997, such covenant will be computed on a 
pro forma basis as though the Formation Transactions had closed, and the 
Effective Date had been, October 1, 1997.

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<PAGE>

         Section 9.6. EBITDA to Fixed Charges. The Borrower will not permit 
the ratio of its EBITDA to Fixed Charges to be less than 1.75 to 1.0 for any 
fiscal quarter. For the fiscal quarter ending December 31, 1997, such 
convenant will be computed on a pro forma basis as though the Formation 
Transactions had closed, and the Effective Date had been, October 1, 1997.

         Section 10. CONDITIONS TO EFFECTIVENESS. This Agreement shall become 
effective when each of the following conditions precedent have been satisfied:

         Section 10.1. Loan Documents. Each of the Loan Documents shall have 
been duly executed and delivered by the respective parties thereto, shall be 
in full force and effect and shall be in form and substance satisfactory to 
each of the Lenders. Each Lender shall have received a fully executed copy of 
each such document prior to or on the Effective Date.

         Section 10.2. Certified Copies of Organization Documents; Good 
Standing Certificates. The Agent shall have received (i) a Certificate of the 
Company to which there shall be attached complete copies of the Borrower's 
Limited Partnership Agreement and its Certificate of Limited Partnership, 
certified as of a recent date by the Secretary of State of Delaware, (ii) 
Certificates of Good Standing for the Borrower from the State of Delaware and 
each State in which a Mortgaged Property is located, (iii) a copy of the 
Company's Declaration of Trust certified by the Maryland Secretary of State, 
(iv) Certificates of Good Standing for the Company from the State of Maryland 
and each State in which a Mortgaged Property is located unless the Company's 
qualification is not required by the laws of such state, and (v) certificates 
of good standing and certified copies of partnership agreements and 
certificates of limited partnership with respect to each of the Guarantor 
Subsidiaries.

         Section 10.3. By-laws; Resolutions. All action on the part of the 
Borrower and each Guarantor necessary for the valid execution, delivery and 
performance by the Borrower and each Guarantor of this Agreement and the 
other Loan Documents to which it is or is to become a party shall have been 
duly and effectively taken, and evidence thereof satisfactory to the Agent 
shall have been provided to the Agent. The Agent shall have received from the 
Company true copies of its by-laws and the resolutions adopted by its Board 
of Directors authorizing the transactions described herein, each certified by 
its secretary to be true and complete and in effect on the Effective Date.

         Section 10.4. Incumbency Certificate; Authorized Signers. The Agent 
shall have received from the Company an incumbency certificate, dated as of 
the Effective Date, signed by a duly authorized officer of the Company and 
giving the name and bearing a specimen signature of each individual who shall 
be authorized: (a) to sign, in the name and on behalf of the Company (in its 
own capacity and as general partner on behalf of Borrower and on behalf of 
each Guarantor Subsidiary which is a partnership), each of the Loan Documents 
to which the Borrower or any Guarantor is or is to become a party; (b) to 
make Loan Requests and Conversion Requests; and (c) to give notices and to 
take other action on behalf of the Borrower under the Loan Documents.

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<PAGE>

         Section 10.5. Opinions of Counsel. Each of the Lenders and the Agent 
shall have received favorable opinions addressed to the Lenders and the Agent 
and dated as of the Effective Date, in form and substance satisfactory to the 
Lenders and the Agent from Borrower's counsel, as to: (a) the matters 
described on Exhibit E and (b) such other opinions with respect to the 
Formation Transactions as the Agent may reasonably require. Such opinion may 
rely on opinions from other law firms approved by the Agent as to matters of 
law applicable in the various states where the Mortgaged Properties are 
located.

         Section 10.6. Payment of Fees. The Borrower shall have paid to the 
Agent and/or the Lead Lenders the fees pursuant to Section 4.1 and Section 
2.9(a) and shall have paid all other expenses as provided in Section 15 
hereof then outstanding.

         Section 10.7. Validity of Liens. The Security Documents shall be 
effective to create in favor of the Agent legal, valid and enforceable first 
priority, perfected liens and security interests in the Collateral covered 
thereby, subject only to the Permitted Liens. All filings, recordings, 
deliveries of instruments and other actions or consents necessary or 
desirable in the reasonable opinion of the Agent to grant, perfect, protect 
and preserve such liens and security interests shall have been duly effected. 
The Agent shall have received evidence thereof in form and substance 
reasonably satisfactory to the Agent.

         Section 10.8. Survey. The Agent shall have received Surveys of the 
Mortgaged Properties, bearing dates reasonably acceptable to the Agent, and 
in form and substance reasonably acceptable to the Agent.

         Section 10.9. Title Insurance; Title Exception Documents. The Agent 
shall have received the Title Policies reasonably satisfactory to the Agent, 
together with proof of payment of all fees and premiums for such policies. 
The Agent shall have received true and accurate copies of all documents 
listed as exceptions under such policies.

         Section 10.10. Leases. The Agent shall have received true copies of 
those Leases which the Agent may request after its review of the applicable 
rent roll.

         Section 10.11. Estoppel and Attornment Agreements. The Agent shall 
have received estoppel certificates and attornment agreements in form 
reasonably satisfactory to the Lead Lenders from the three (3) Tenants who 
lease and occupy the largest amount gross leasable area of the West Wacker 
Drive Property and from any other Major Tenants specifically required by the 
Agent.

         Section 10.12. Certificates of Insurance. The Agent shall have 
received (a) a certificate of insurance as to the insurance maintained by 
Borrower on the Mortgaged Properties (including flood insurance if necessary) 
from the insurer or an independent insurance broker dated as of the Effective 
Date, identifying insurers, types of insurance, insurance limits, and policy 
terms; 

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<PAGE>

(b) certified copies of all policies evidencing such insurance (or 
certificates therefor signed by tile insurer or an agent authorized to bind 
the insurer); and (c) such further information and certificates from 
Borrower, its insurers and insurance brokers as the Agent may reasonably 
request.

         Section 10.13. Environmental Reports. The Agent shall have received 
an Environmental Report with respect to each of the Mortgaged Properties, 
dated as of a recent date, from environmental engineers reasonably acceptable 
to the Agent which Environmental Reports shall have been approved by the Lead 
Lenders.

         Section 10.14. Environmental Indemnity. The Agent shall have 
received an executed original of the environmental indemnity described in the 
Equity Prospectus from The Prime Group, Inc. for the benefit of certain of 
the Guarantor Subsidiaries with respect to environmental liabilities relating 
to certain of the Mortgaged Properties, together with an agreement from The 
Prime Group, Inc. that the Lenders shall be a beneficiary thereunder in the 
event of any foreclosure of the applicable Mortgaged Properties, which 
indemnity and agreement shall be in form and substance satisfactory to the 
Agent and the Lead Lenders.

         Section 10.15. Appraisals. The Agent and each of the Lenders shall 
have received Appraisals dated as of a recent date in form and substance 
satisfactory to the Agent and the Lead Lenders (including satisfaction as to 
determination of Appraised Value).

         Section 10.16. Inspecting Engineers' Reports. The Agent shall have 
received reports, addressed to Agent and the Lenders or accompanied by 
reliance letters in favor of the Agent and the Lenders, from third party 
inspecting engineers dated as of a date acceptable to the Agent as to the 
good structural condition of the Buildings located on the Mortgaged 
Properties, which reports shall be in form and substance satisfactory to the 
Agent.

         Section 10.17. Initial Letters of Credit. The Agent shall have 
received with respect to each of the Initial Letters of Credit (i) a Letter 
of Credit Request executed by Borrower, and (ii) copies of all legal opinions 
and certificates delivered in connection with such replacement of letters of 
credit pursuant to the applicable IRB Documents.

         Section 10.18. UCC Lien Searches. The Agent shall have received UCC 
lien searches of the applicable public records disclosing no conditional 
sales contracts, security agreements, chattel mortgages, leases of 
personalty, financing statements or other encumbrances which affect any of 
the Collateral other than those relating to any liens permitted hereby and by 
the Security Documents.

         Section 10.19. Formation Transactions Complete. The Lead Lenders 
shall have received evidence satisfactory to each of them that all of the 
Formation Transactions have been completed on the Effective Date and that the 
net proceeds of the sale of the common and preferred shares of 

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<PAGE>

beneficial interest in the Company were not less than the amount described in 
the Equity Prospectus.

         Section 11. CONDITIONS TO ALL BORROWINGS. The obligations of the 
Lenders to make any Loan, whether on or after the Effective Date, shall also 
be subject to the satisfaction of the following conditions precedent:

         Section 11.1. Representations True; No Event of Default; Compliance 
Certificate. Each of the representations and warranties of the Borrower and 
the Company contained in this Agreement, the other Loan Documents or in any 
document or instrument delivered pursuant to or in connection with this 
Agreement shall be true in all material respects as of the date as of which 
they were made and shall also be true in all material respects at and as of 
the time of the making of such Loan, with the same effect as if made at and 
as of that time (except to the extent of changes resulting from transactions 
contemplated or permitted by this Agreement and the other Loan Documents and 
changes occurring in the ordinary course of business that singly or in the 
aggregate are not materially adverse, and except to the extent that such 
representations and warranties relate expressly to an earlier date); the 
Borrower shall have performed and complied with all terms and conditions 
herein required to be performed by it or prior to the Borrowing Date of such 
Loan; and no Default or Event of Default shall have occurred and be 
continuing on the date of any Loan Request or on the Borrowing Date of such 
Loan. Each of the Lenders shall have received a Compliance Certificate of the 
Borrower signed by a Responsible Officer to such effect, which certificate 
will include, without limitation, computations evidencing compliance with the 
covenants contained in Section 9 hereof after giving effect to such requested 
Loan.

         Section 11.2. No Legal Impediment. No change shall have occurred in 
any law or regulations thereunder or interpretations thereof that in the 
reasonable opinion of any Lender would make it illegal for such Lender to 
make such Loan.

         Section 11.3. Governmental Regulation. Each Lender shall have 
received such statements in substance and form reasonably satisfactory to 
such Lender as such Lender shall require for the purpose of compliance with 
any applicable regulations of the Comptroller of the Currency or the Board of 
Governors of the Federal Reserve System.

         Section 11.4. Proceedings and Documents. All proceedings in 
connection with the transactions contemplated by this Agreement, the other 
Loan Documents and all other documents incident thereto shall be reasonably 
satisfactory in substance and in form to the Agent, and the Lenders shall 
have received all information and such counterpart originals or certified or 
other copies of such documents as the Agent may reasonably request.

         Section 12. EVENTS OF DEFAULT; ACCELERATION; ETC.

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<PAGE>

         Section 12.1. Events of Default and Acceleration. If any of the 
following events ("Events of Default" or, if the giving of notice or the 
lapse of time or both is required, then, prior to such notice or lapse of 
time, "Defaults") shall occur:

                  (a) the Borrower shall fail to pay any principal of the 
Loans when the same shall become due and payable;

                  (b) the Borrower shall fail to pay any interest on the 
Loans or any other sums due hereunder or under any of the other Loan 
Documents within five (5) days after the same shall become due and payable or 
the Borrower shall fail to deposit in the IRB Indebtedness Account sufficient 
funds as required by Section 2.8;

                  (c) the Borrower or the Company shall fail to comply with 
any of its covenants contained in Section 7.5, the first sentence of Section 
7.6, the first sentence of Section 7.7, Section 7.20, Section 8 or Section 9 
hereof;

                  (d) the Borrower, the Company or any Guarantor shall fail 
to perform any other term, covenant or agreement contained herein or in any 
of the other Loan Documents (other than those specified elsewhere in this 
Section 12) for thirty (30) days after written notice of such failure from 
Agent to the Borrower, provided, however that if the Borrower fails to give 
notice of any Default as required by Section 7.5(a), such thirty (30) day 
cure period shall be deemed to have started on the date such notice should 
have been given;

                  (e) any representation or warranty of the Borrower or the 
Company in this Agreement or any of the other Loan Documents or in any other 
document or instrument delivered pursuant to or in connection with this 
Agreement, shall prove to have been false in any material respect upon the 
date when made or deemed to have been made or repeated, and shall continue to 
be false on the date that the Agent or any Lender takes action based on the 
Default relating to such representation or warranty, provided, however, that 
with respect to the representations and warranties of the Borrower contained 
in Section 6.2, Section 6.3, Section 6.13, Section 6.18 and in paragraphs 
(a), (c), (d), (e) and (f) of Section 6.22, if the condition or event making 
the representation and warranty false is capable of being cured by the 
Borrower, no enforcement action has been commenced against the Borrower or 
the applicable Mortgaged Property on account of such condition or event nor 
is the applicable Mortgaged Property subject to risk of forfeiture due to 
such condition or event, and the Borrower promptly commences the cure thereof 
after the Borrower's first obtaining knowledge of such condition or event, 
the Borrower shall have a period of thirty (30) days after the date that the 
Borrower first obtained knowledge of such condition or event during which the 
Borrower may cure such condition or event (or, if such condition or event is 
not reasonably capable of being cured within such thirty (30) day period, 
such additional period of time as may be reasonably required in order to cure 
such condition or event but in any event such period shall not exceed six (6) 
months from the date that the Borrower first obtained knowledge of such 
condition or event), and no Event of Default shall exist hereunder during 
such thirty (30) day or additional period so long as the Borrower

                                       64
<PAGE>

continuously and diligently pursues the cure of such condition or event and 
the other conditions to such cure period have not changed;

                  (f) the Borrower, the Company, any of the Related Companies 
or any Permitted Joint Venture shall fail to pay at maturity, or within any 
applicable period of grace, any Recourse Indebtedness, or shall fail to 
observe or perform any material term, covenant or agreement contained in any 
agreement by which it is bound, evidencing or securing Indebtedness for such 
period of time as would permit (assuming the giving of appropriate notice if 
required) the holder or holders thereof or of any obligations issued 
thereunder to accelerate the maturity thereof, and in any event, such failure 
shall continue for thirty (30) days, unless the aggregate amount of all such 
defaulted Recourse Indebtedness plus the amount of any unsatisfied judgments 
described in paragraph (i) of this Section 12.1 is less than $10,000,000.00;

                  (g) any of the Borrower, the Company or any Guarantor shall 
make an assignment for the benefit of creditors, or admit in writing its 
inability to pay or generally fail to pay its debts as they mature or become 
due, or shall petition or apply for the appointment of a trustee or other 
custodian, liquidator or receiver of any substantial part of its properties 
or shall commence any case or other proceeding under any bankruptcy, 
reorganization, arrangement, insolvency, readjustment of debt, dissolution or 
liquidation or similar law of any jurisdiction, now or hereafter in effect, 
or shall take any action to authorize or in furtherance of any of the 
foregoing, or if any such petition or application shall be filed or any such 
case or other proceeding shall be commenced against any such Person and such 
Person shall indicate its approval thereof, consent thereto or acquiescence 
therein or any of the events described in this paragraph shall occur with 
respect to any other Related Company or any Permitted Joint Venture and such 
event shall have a Material Adverse Effect;

                  (h) a decree or order is entered appointing any such 
trustee, custodian, liquidator or receiver or adjudicating the Borrower, the 
Company, or any Guarantor bankrupt or insolvent, or approving a petition in 
any such case or other proceeding, or a decree or order for relief is entered 
in respect of the Borrower, the Company, or any Guarantor in an involuntary 
case under federal bankruptcy laws as now or hereafter constituted or any of 
the events described in this paragraph shall occur with respect to any other 
Related Company or any Permitted Joint Venture and such event shall have a 
Material Adverse Effect;

                  (i) there shall remain in force, undischarged, unsatisfied 
and unstayed, for more than thirty days, whether or not consecutive, any 
uninsured final judgment against the Borrower that, with other outstanding 
uninsured final judgments, undischarged, against the Borrower, the Company or 
any of the Related Companies plus the amount of any defaulted Recourse 
Indebtedness under paragraph (f) of this Section 12.1, exceeds in the 
aggregate $10,000,000.00;

                  (j) if any of the Loan Documents or any material provision 
of any Loan Documents shall be unenforceable, cancelled, terminated, revoked 
or rescinded otherwise than in 

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accordance with the terms thereof or with the express prior written 
agreement, consent or approval of the Agent, or any action at law, suit or in 
equity or other legal proceeding to make unenforceable, cancel, revoke or 
rescind any of the Loan Documents shall be commenced by or on behalf of the 
Borrower, the Company or any Guarantor, or any court or any other 
governmental or regulatory authority or agency of competent jurisdiction 
shall make a determination that, or issue a judgment, order, decree or ruling 
to the effect that, any one or more of the Loan Documents is illegal, invalid 
or unenforceable in accordance with the terms thereof;

                  (k) the Borrower, the Company or any Guarantor shall be 
indicted for a federal crime, a punishment for which could include the 
forfeiture of any assets of the Borrower;

                  (l) any "Event of Default," as defined in any of the IRB 
Documents shall occur provided that if such Event of Default is caused by the 
issuer or other Person other than the Guarantor Subsidiary, the same shall 
constitute an Event of Default hereunder only if the maturity of the 
applicable IRB Indebtedness is accelerated based thereon;

                  (m)  any "Event of Default", as defined in any of the other 
Loan Documents shall occur;

then, and in any such event, so long as the same may be continuing, the Agent 
may, and upon the request of the Requisite Lenders shall, by notice in 
writing to the Borrower declare all amounts owing with respect to this 
Agreement, the Notes and the other Loan Documents to be, and they shall 
thereupon forthwith become, immediately due and payable without presentment, 
demand, protest or other notice of any kind, all of which are hereby 
expressly waived by the Borrower; provided that in the event of any Event of 
Default specified in Sections 12.1(g) or 12.1(h), all such amounts 
shall become immediately due and payable automatically and without any 
requirement of notice from the Agent or action by the Requisite Lenders.

         Section 12.2. Termination of Commitments; Drawing of IRB Letters of 
Credit. If any one or more Events of Default specified in Section 12.1(g) or 
Section 12.1(h) shall occur, any unused portion of the Commitments hereunder 
shall forthwith terminate and the Lenders shall be relieved of all 
obligations to make Loans to the Borrower. If any other Event of Default 
shall have occurred and be continuing, any Lender may by notice to the 
Borrower terminate the unused portion of its Commitment hereunder, and upon 
such notice being given such unused portion of its Commitment hereunder shall 
terminate immediately and such Lender shall be relieved of all further 
obligations to make Loans, provided, however, such Lender shall not be 
relieved of its obligation to pay its Proportionate Share of Unreimbursed 
Drawings under Section 2.9. No termination of such Lender's Commitment 
hereunder shall relieve the Borrower of any of the Obligations or any of its 
existing obligations to such Lender arising under other agreements or 
instruments. At any time after any Commitments have been terminated pursuant 
hereto, the Agent may, in its sole discretion, give such notices as may be 
permitted under the terms of the IRB Letters of Credit or the related IRB 
Documents to cause the bonds relating to the IRB Indebtedness to be

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accelerated or to cause a mandatory tender thereof or to cause the IRB 
Letters of Credit to be drawn by the beneficiary thereof or to cause the 
applicable IRB Letters of Credit to expire if not drawn within the specified 
period after the giving of such notice.

         Section 12.3. Remedies. In case any one or more of the Events of 
Default shall have occurred, and whether or not the Requisite Lenders shall 
have accelerated the maturity of the Loans pursuant to Section 12.1, each 
Lender, if owed any amount with respect to the Loans, may, with the consent 
of the Requisite Lenders, direct the Agent to proceed to protect and enforce 
the rights and remedies of the Agent and the Lenders under this Agreement, 
the Notes, the IRB Documents or any of the other Loan Documents by suit in 
equity, action at law or other appropriate proceeding, whether for the 
specific performance of any covenant or agreement contained in this Agreement 
and the other Loan Documents or any instrument pursuant to which the 
Obligations are evidenced, including to the full extent permitted by 
applicable law the obtaining of the ex parte appointment of a receiver and, 
if any amount shall have become due, by declaration or otherwise, to proceed 
to enforce the payment thereof or any other legal or equitable right of such 
Lender. No remedy herein conferred upon any Lender or the Agent or the 
holder of any Note is intended to be exclusive of any other remedy and each 
and every remedy shall be cumulative and shall be in addition to every other 
remedy given hereunder or now or hereafter existing at law or in equity or by 
statute or any other provision of law.

         Section 12.4. Distribution of Collateral Proceeds. In the event 
that, following the occurrence or during the continuance of any Default or 
Event of Default, the Agent or any Lender as the case may be, receives any 
monies in connection with the enforcement of any of the Security Documents, 
or otherwise with respect to the realization upon any of the Collateral, such 
monies shall be distributed for application as follows:

                  (a) First, to the payment of, or (as the case may be) the 
reimbursement of the Agent for or in respect of all reasonable costs, 
expenses, disbursements and losses which shall have been incurred or 
sustained by the Agent in connection with the collection of such monies by 
the Agent, for the exercise, protection or enforcement by the Agent of all or 
any of the rights, remedies, powers and privileges of the Agent or the 
Lenders under this Agreement or any of the other Loan Documents or in respect 
of the Collateral or in support of any provision of adequate indemnity to the 
Agent against any taxes or liens which by law shall have, or may have, 
priority over the rights of the Agent to such monies;

                  (b) Second, to all other Obligations in such order or 
preference as the Requisite Lenders may determine; provided, however, that 
distribution in respect of such Obligations shall be made among the Lenders 
pro rata in accordance with each Lender's respective Commitment Percentage; 
and provided, further, that the Agent may in its discretion make proper 
allowance to take into account any Obligations not then due and payable;

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<PAGE>

                  (c) Third, upon payment and satisfaction in full or other 
provisions for payment in full satisfactory to the Requisite Lenders and the 
Agent of all of the obligations, and to the payment of any obligations 
required to be paid pursuant to Section 9-504(1)(c) of the Uniform Commercial 
Code of the State of New York; and

                  (d) Fourth, the excess, if any, shall be returned to the 
Borrower or to such other Persons as are legally entitled thereto.

         Section 12.5. Addition of Real Estate Assets to Cure Default. As an 
alternative to the payment of cash to cure a Default under Section 9.1 or 
Section 9.2 hereof, the Borrower shall have the right to offer to provide 
additional Collateral to the Agent in the form of Additional Properties 
pursuant to Section 5.3 and Section 5.4, for the purpose of curing a Default 
under Section 9.1 or Section 9.2 hereof, if the Borrower designates such 
Collateral for addition within fifteen (15) days after the occurrence of such 
Default and the Borrower, the Company or the Mortgagor, as applicable, 
executes and delivers to the Agent a Security Deed, an Assignment of Leases 
and Rents, an Indemnity Agreement and UCC-1 Financing Statements relating to 
the Additional Property together with the Certificates and opinion described 
in Section 5.4(d) and Section 5.4(e) within thirty (30) days after the 
occurrence of such Default. The Agent and the Lenders shall accept and 
approve the addition of such Collateral as a cure for such Default if such 
Collateral shall cure the Default and satisfies the due diligence 
requirements of the Agent and the Requisite Lenders, including, without 
limitation, the conditions set forth in Section 5.4 and those requirements 
with respect to the Mortgaged Properties specified in Section 10 hereof, 
within ninety (90) days after the occurrence of the subject Default, and at 
the time that such due diligence requirements are so satisfied, no other 
Defaults or Events of Default are continuing. If any such additional 
Collateral is provided to the Agent in accordance with this Section 12.5, 
such additional Collateral shall, for all purposes hereof, be deemed to be a 
"Mortgaged Property." Until the Agent and Requisite Lenders have acknowledged 
in writing the cure of such Default (which written acknowledgment will be 
given promptly after such cure has been completed as herein provided), all 
consequences of such Default hereunder shall be effective (except as provided 
in Section 8.7) and the Agent may exercise all available remedies except that 
the maturity of the Loans shall not be accelerated based solely on the 
Default which Borrower is diligently attempting to cure hereunder, prior to 
the expiration of said ninety (90) day period.

         Section 13. SETOFF. Regardless of the adequacy of any Collateral, 
during the continuance of any Event of Default, any deposits (general or 
specific, time or demand, provisional or final, regardless of currency, 
maturity, or the branch of where such deposits are held) or other sums 
credited by or due from any of the Lenders to the Borrower and any securities 
or other property of the Borrower in the possession of such Lender may WITH 
THE PRIOR APPROVAL OF THE AGENT be applied to or set off against the payment 
of Obligations and any and all other liabilities, direct, or indirect, 
absolute or contingent, due or to become due, now existing or hereafter 
arising, of the Borrower to such Lender. Each of the Lenders agrees with each 
other Lender that (a) if an amount to be set off is to be applied to 
Indebtedness of the Borrower to such 

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<PAGE>

Lender, other than Indebtedness evidenced by the Notes held by such Lender, 
such amount shall be applied ratably to such other Indebtedness and to the 
Indebtedness evidenced by all such Notes held by such Lender, and (b) if such 
Lender shall receive from the Borrower, whether by voluntary payment, 
exercise of the right of setoff, counterclaim, cross action, enforcement of 
the claim evidenced by the Notes held by such Lender by proceedings against 
the Borrower at law or in equity or by proof thereof in bankruptcy, 
reorganization, liquidation, receivership or similar proceedings, or 
otherwise, and shall retain and apply to the payment of the Note or Notes 
held by such Lender any amount in excess of its ratable portion of the 
payments received by all of the Lenders with respect to the Notes held by all 
of the Lenders, such Lender will make such disposition and arrangements with 
the other Lenders with respect to such excess, either by way of distribution, 
pro tanto assignment of claims, subrogation or otherwise as shall result in 
each Lender receiving in respect of the Notes held by it its proportionate 
payment as contemplated by this Agreement; provided that if all or any part 
of such excess payment is thereafter recovered from such Lender, such 
disposition and arrangements shall be rescinded and the amount restored to 
the extent of such recovery, but without interest. Notwithstanding the 
foregoing, no Lender shall exercise a right of setoff if such exercise would 
limit or prevent the exercise of any other remedy, right to Collateral or 
other recourse against the Borrower.

         Section 14. THE AGENT.

         Section 14.1. Authorization. The Agent is authorized to take such 
action on behalf of each of the Lenders and to exercise all such powers as 
are hereunder and under any of the other Loan Documents and any related 
documents delegated to the Agent, together with such powers as are reasonably 
incident thereto, provided that no duties or responsibilities not expressly 
assumed herein or therein shall be implied to have been assumed by the Agent. 
The relationship between the Agent and the Lenders is and shall be that of 
agent and principal only, and nothing contained in this Agreement or any of 
the other Loan Documents shall be construed to constitute the Agent as a 
trustee for any Lender.

         Section 14.2. Employees and Agents. The Agent may exercise its 
powers and execute its duties by or through employees or agents and shall be 
entitled to take, and to rely on, advice of counsel concerning all matters 
pertaining to its rights and duties under this Agreement and the other Loan 
Documents. The Agent may utilize the services of such Persons as the Agent in 
its sole discretion may reasonably determine, and all reasonable fees and 
expenses of any such Persons shall be paid by the Borrower.

         Section 14.3. No Liability. Neither the Agent nor any of its 
shareholders, directors, officers or employees nor any other Person assisting 
them in their duties nor any agent or employee thereof, shall be liable for 
any waiver, consent or approval given or any action taken, or omitted to be 
taken, in good faith by it or them hereunder or under any of the other Loan 
Documents, or in connection herewith or therewith, or be responsible for the 
consequences of any oversight or 

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<PAGE>

error of judgment whatsoever, except that the Agent or such other Person, as 
the case may be, may be liable for losses due to its willful misconduct or 
gross negligence.

         Section 14.4. No Representations. The Agent shall not be responsible 
for the execution or validity or enforceability of this Agreement, the Notes, 
any of the other Loan Documents or any instrument at any time constituting, 
or intended to constitute, collateral security for the Notes, or for the 
value of any such collateral security or for the validity, enforceability or 
collectability of any such amounts owing with respect to the Notes, or for 
any recitals or statements, warranties or representations made herein or in 
any of the other Loan Documents or in any certificate or instrument hereafter 
furnished to it by or on behalf of the Borrower, or be bound to ascertain or 
inquire as to the performance or observance of any of the terms, conditions, 
covenants or agreements herein or in any instrument at any time constituting, 
or intended to constitute, collateral security for the Notes. The Agent shall 
not be bound to ascertain whether any notice, consent, waiver or request 
delivered to it by the Borrower or any holder of any of the Notes shall have 
been duly authorized or is true, accurate and complete. The Agent has not 
made nor does it now make any representations or warranties, express or 
implied, nor does it assume any liability to the Lenders, with respect to the 
credit worthiness or financial condition of the Borrower. Each Lender 
acknowledges that it has, independently and without reliance upon the Agent 
or any other Lender , and based upon such information and documents as it has 
deemed appropriate, made its own credit analysis and decision to enter into 
this Agreement. Each Lender has been independently represented by separate 
counsel regarding this Agreement.

         Section 14.5. Payments.

                  (a) A payment by the Borrower to the Agent hereunder or any 
of the other Loan Documents for the account of any Lender shall constitute a 
payment to such Lender subject to the pro rata rights to repayment based upon 
the Commitment Percentage of each Lender. The Agent agrees promptly to 
distribute to each Lender such Lender's pro rata share of payments received 
by the Agent for the account of the Lenders except as otherwise expressly 
provided herein or in any of the other Loan Documents.

                  (b) If in the opinion of the Agent the distribution of any 
amount received by it in such capacity hereunder, under the Notes or under 
any of the other Loan Documents might involve it in liability, it may refrain 
from making distribution until its right to make distribution shall have been 
adjudicated by a court of competent jurisdiction. If a court of competent 
jurisdiction shall adjudge that any amount received and distributed by the 
Agent is to be repaid, each Person to whom any such distribution shall have 
been made shall either repay to the Agent its proportionate share of the 
amount so adjudged to be repaid or shall pay over the same in such manner and 
to such Persons as shall be determined by such court.

                  (c) Notwithstanding anything to the contrary contained in 
this Agreement or any of the other Loan Documents, any Lender that fails (i) 
to make available to the Agent its pro rata 

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share of any Loan or of any Unreimbursed Drawing or (ii) to comply with the 
provisions of Section 12.4 or Section 13 with respect to making dispositions 
and arrangements with the other Lenders, where such Lender's share of any 
payment received, whether by setoff or otherwise, is in excess of its pro 
rata share of such payments due and payable to all of the Lenders, in each 
case as, when and to the full extent required by the provisions of this 
Agreement, or to adjust promptly such Lender's outstanding principal and its 
pro rata Commitment Percentage as provided in Section 2.1 hereof, shall be 
deemed delinquent (a "Delinquent Lender ") and shall be deemed a Delinquent 
Lender until such time as such delinquency is satisfied. A Delinquent Lender 
shall be deemed to have assigned any and all payments due to it from the 
Borrower, whether on account of outstanding Loans, interest, fees or 
otherwise, to the remaining nondelinquent Lenders for application to, and 
reduction of, their respective pro rata shares of all outstanding Loans. The 
Delinquent Lender hereby authorizes the Agent to distribute such payments to 
the nondelinquent Lenders in proportion to their respective pro rata shares 
of all outstanding Loans. A Delinquent Lender shall be deemed to have 
satisfied in full a delinquency when and if, as a result of application of 
the assigned payments to all outstanding Loans of the nondelinquent Lenders, 
the Lenders' respective pro rata shares of all outstanding Loans have 
returned to those in effect immediately prior to such delinquency and without 
giving effect to the nonpayment causing such delinquency.

         Section 14.6. Holders of Notes. The Agent may deem and treat the 
payee of any Note as the absolute owner or purchaser thereof for all purposes 
hereof until it shall have been furnished in writing with a different name by 
such payee or by a subsequent holder assignee or transferee.

         Section 14.7. Indemnity. The Lenders ratably agree hereby to 
indemnify and hold harmless the Agent from and against any and all claims, 
actions and suits (whether groundless or otherwise), losses, damages, costs, 
expenses (including any expenses for which the Agent has not been reimbursed 
by the Borrower as required by Section 15), and liabilities of every nature 
and character arising out of or related to this Agreement, the Notes, or any 
of the other Loan Documents or the transactions contemplated or evidenced 
hereby or thereby, or the Agent's actions taken hereunder or thereunder, 
except to the extent that any of the same shall be directly caused by the 
Agent's willful misconduct or gross negligence.

         Section 14.8. Agent as Lender. In its individual capacity, 
BankBoston shall have the same obligations and the same rights, powers and 
privileges in respect to its Commitment and the Loans made by it, and as the 
holder of any of the Notes as it would have were it not also the Agent. By 
issuing the Letters of Credit in its individual capacity BankBoston is bound 
to perform its duties and obligations under such Letters of Credit as 
provided therein. BankBoston's status as Agent hereunder shall not limit or 
restrict its ability to perform such duties and obligations.

         Section 14.9. Resignation. The Agent may resign at any time by 
giving sixty (60) days, prior written notice thereof to the Lenders and the 
Borrower. Upon any such resignation, the 

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Requisite Lenders shall have the right to appoint a successor Agent. Unless a 
Default or Event of Default shall have occurred and be continuing, 
appointment of such successor Agent shall be subject to the reasonable 
approval of the Borrower. If no successor Agent shall have been so appointed 
by the Requisite Lenders and shall have accepted such appointment within 
thirty (30) days after the giving of notice of resignation or removal, or the 
Borrower has disapproved or failed to approve a successor agent within such 
period, then the retiring Agent may, on behalf of the Lenders, appoint a 
successor Agent, which shall be a financial institution having a rating of 
not less than A2/P2 or its equivalent by Standard & Poor's Corporation. Upon 
the acceptance of any appointment as Agent hereunder by a successor Agent, 
such successor Agent shall thereupon succeed to and become vested with all 
the rights, powers, privileges and duties of the retiring Agent, and the 
retiring Agent shall be discharged from its duties and obligations as Agent 
hereunder. After any retiring Agent's resignation, the provisions of this 
Agreement and the other Loan Documents shall continue in effect for its 
benefit in respect of any actions taken or omitted to be taken by it while it 
was acting as Agent.

         Section 14.10. Notification of Defaults and Events of Default. Each 
Lender hereby agrees that, upon learning of the existence of a Default or an 
Event of Default, it shall promptly notify the Agent thereof. The Agent 
hereby agrees that upon receipt of any notice under this Section 14.10 it 
shall promptly notify the other Lenders of the existence of such Default or 
Event of Default.

         Section 14.11. Duties in the Case of Enforcement. In case one of 
more Events of Default have occurred and shall be continuing, and whether or 
not acceleration of the Obligations shall have occurred, the Agent shall, if 
(a) so requested by the Requisite Lenders and (b) the Lenders have provided 
to the Agent such additional indemnities and assurances against expenses and 
liabilities as the Agent may reasonably request, proceed to enforce the 
provisions of the Security Documents authorizing the sale or other 
disposition of all or any part of the Collateral and exercise all or any such 
other legal and equitable and other rights or remedies as it may have in 
respect of such Collateral. The Requisite Lenders may direct the Agent in 
writing as to the method and the extent of any such sale or other 
disposition, the Lenders hereby agreeing to indemnify and hold the Agent 
harmless from all liabilities incurred in respect of all actions taken or 
omitted in accordance with such directions, provided that the Agent need not 
comply with any such direction to the extent that the Agent reasonably 
believes the Agent's compliance with such direction to be unlawful or 
commercially unreasonable in any applicable jurisdiction. The Agent may take 
such steps as it reasonably determines for the taking of possession or title 
to any Collateral, including the formation of trusts or corporation with each 
Lender having a beneficial interest equal to its pro rata percentage of the 
outstanding Loans.

         Section 14.12. Mandatory Resignation of Agent. In the event that the 
Agent enters into one or more Assignments pursuant to Section 18 having the 
effect of reducing the Agent's Commitment to less than $25,000,000 (which 
number will be reduced in proportion to any reduction in the Total Commitment 
pursuant to Section 2.2) then the Agent shall promptly so notify the Borrower 
and the Lenders. Upon the written request of the Borrower or any Lender whose 
Commitment exceeds

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that of the Agent, which written request is made within thirty (30) days 
after the Agent's notice that its Commitment is below such minimum level, the 
Agent shall be obligated to resign pursuant to Section 14.9.

         Section 15. EXPENSES. The Borrower agrees to pay (a) the reasonable 
costs of producing and reproducing this Agreement, the other Loan Documents 
and the other agreements and instruments mentioned herein, (b) any taxes 
(including any interest and penalties in respect thereto) payable by the 
Agent or any of the Lenders (other than taxes based upon the Agent's or any 
Lender's net income), including any recording, mortgage, documentary or 
intangibles taxes in connection with the Security Documents and other Loan 
Documents, or other taxes payable on or with respect to the transactions 
contemplated by this Agreement, including any such taxes payable by the Agent 
or any of the Lenders after the Effective Date (the Borrower hereby agreeing 
to indemnify the Lenders with respect thereto), (c) all title insurance 
premiums, appraisal fees, engineer's, inspector's and surveyor's fees, 
recording costs and the reasonable fees, expenses and disbursements of the 
Agent's counsel or any local counsel to the Agent incurred in connection with 
the preparation, administration or interpretation of the Loan Documents and 
other instruments mentioned herein, each closing hereunder, and amendments, 
modifications, approvals, consents or waivers hereto or hereunder, (d) the 
reasonable fees, costs, expenses and disbursements of the Agent incurred in 
connection with the preparation, administration or interpretation of the Loan 
Documents and other instruments mentioned herein including without 
limitation, the reasonable costs incurred by the Agent in connection with its 
inspection of the Mortgaged Properties, and the fees and disbursements of the 
Agent's counsel and the Borrower's legal counsel in preparing documentation, 
(e) the reasonable fees, costs, expenses and disbursements of the Agent 
incurred in connection with the syndication and/or participation of the 
Loans, (f) all reasonable out-of-pocket expenses (including reasonable 
attorneys' fees and costs, which attorneys may be employees of any Lender or 
the Agent and the fees and costs of appraisers, engineers, investment 
bankers, surveyors or other experts retained by the Agent or any Lender in 
connection with any such enforcement proceedings) incurred by any Lender or 
the Agent in connection with (i) the enforcement of or preservation of rights 
under any of the Loan Documents against the Borrower or the administration 
thereof after the occurrence of a Default or Event of Default (including, 
without limitation, expenses incurred in any restructuring and/or "workout" 
of the Loans), and (ii) any litigation, proceeding or dispute whether arising 
hereunder or otherwise, in any way related to the Agent's or the Lender's 
relationship with the Borrower, the Company, any Permitted Joint Venture or 
any of the Related Companies, (g) all reasonable fees, expenses and 
disbursements of the Agent incurred in connection with UCC searches, UCC 
filings or mortgage recordings, (h) all reasonable costs incurred by the 
Agent in the future in connection with its inspection of the Mortgaged 
Properties (which inspections shall occur not more frequently than annually 
prior to an Event of Default), and (i) the reasonable fees, costs, expenses 
and disbursements of the Agent incurred in connection with the granting of 
additional Collateral by the Borrower pursuant to Section 12.5 hereof, 
including, without limitation, the costs incurred by the Agent in connection 
with its inspection of such additional Collateral, and the fees and 
disbursements of the Agent's counsel. The covenants 

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of this Section 15 shall survive payment or satisfaction of payment of 
amounts owing with respect to the Notes.

         Section 16. INDEMNIFICATION. Each of the Borrower and the Company, 
jointly and severally, agrees to indemnify and hold harmless the Agent and 
the Lenders and the shareholders, directors, agents, officers, subsidiaries, 
and affiliates of the Agent and the Lenders from and against any and all 
claims, actions or causes of action and suits whether groundless or 
otherwise, and from and against any and all Liabilities, losses, settlement 
payments, obligations, damages and expenses of every nature and character 
arising out of this Agreement or any of the other Loan Documents or the 
Formation Transactions or any other transactions contemplated hereby or which 
otherwise arise in connection with the financing including, without 
limitation unless directly caused by the gross negligence or willful 
misconduct of a Lender or the Agent (but such limitation on indemnification 
shall only apply to the Agent or Lender being grossly negligent or committing 
willful misconduct), (a) any actual or proposed use by the Borrower of the 
proceeds of any of the Loans or the Drawings of any Letters of Credit, (b) 
any actual or alleged infringement of any patent, copyright, trademark, 
service mark or similar right of the Borrower comprised in the Collateral, 
(c) the Borrower or any Guarantor entering into or performing this Agreement 
or any of the other Loan Documents or (d) any cost, claim liability, damage 
or expense in connection with any harm the Borrower may be found to have 
caused in the role of a broker, in each case including, without limitation, 
the reasonable fees and disbursements of counsel and allocated costs of 
internal counsel incurred in connection with any such investigation, 
litigation or other proceeding. In litigation, or the preparation therefor, 
the Lenders and the Agent shall each be entitled to select their own separate 
counsel to the extent that their representation by the same counsel would 
present such counsel with a conflict of interest, or would be inappropriate 
due to actual or potential differing interests or because there may be 
defenses available to certain of such persons that are different from or in 
addition to those available to the other persons to be represented by such 
counsel and, in addition to the foregoing indemnity, the Borrower agrees to 
pay promptly the reasonable fees and expenses of such counsel. In the event 
that Agent or any Lender is made a party to any litigation against the 
Company or the Borrower relating to or arising from the Formation 
Transactions, the Borrower or the Company may, or if requested by the Agent 
or the Requisite Lenders shall, assume primary responsibility for the defense 
thereof with counsel reasonably satisfactory to the Requisite Lenders, 
subject to the right of the Agent and the Lenders to separate counsel to the 
extent provided in the preceding sentence. If, and to the extent that the 
obligations of the Borrower or the Company under this Section 16 are 
unenforceable for any reason, the Borrower and the Company hereby agree to 
make the maximum contribution to the payment in satisfaction of such 
obligations which is permissible under applicable law. The provisions of this 
Section 16 shall survive the repayment of the Loans and the termination of 
the obligations of the Lenders hereunder and shall continue in full force and 
effect as to the Lenders so long as the possibility of any such claim, 
action, cause of action or suit exists.

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         Section 17.     SURVIVAL OF COVENANTS, ETC.  All covenants, 
agreements, representations and warranties made herein, in the Notes, in any 
of the other Loan Documents or in any documents or other papers delivered by 
or on behalf of the Borrower or any Guarantor pursuant hereto shall be deemed 
to have been relied upon by the Lenders and the Agent, notwithstanding any 
investigation heretofore or hereafter made by it, and shall survive the 
making by the Lenders of the Loans, as herein contemplated, and shall 
continue in full force and effect so long as any amount due under this 
Agreement or the Notes or any of the other Loan Documents remains outstanding 
or the Lenders have any obligation to make any Loans. The indemnification 
obligations of the Borrower provided herein and the other Loan Documents 
shall survive the full repayment of amounts due and the termination of the 
obligations of the Lenders hereunder and thereunder to the extent provided 
herein and therein. All statements contained in any certificate or other 
paper delivered to the Agent or any Lender at any time by or on behalf of the 
Borrower pursuant hereto or in connection with the transactions contemplated 
hereby shall constitute representations and warranties by the Borrower 
hereunder.

         Section 18.     ASSIGNMENT; PARTICIPATIONS; ETC.

         Section 18.1. Conditions to Assignment by Lenders. Except as 
provided herein, each Lender may assign to one or more Eligible Assignees all 
or a portion of its interests, rights and obligations under this Agreement 
(including all or a portion of its Commitment Percentage and Commitment and 
the same portion of the Loans at the time owing to it, and the Notes held by 
it; provided that (a) the Agent shall have given its prior written consent to 
such assignment except that such consent shall not be needed with respect to 
an assignment from a Lender to one of its Affiliated Lenders or to another 
Lender, (b) each such assignment shall be of a constant, and not a varying, 
percentage of all the assigning Lender's rights and obligations under this 
Agreement, (c) each assignment shall be in an amount of not less than 
$10,000,000 that is a whole multiple of $1,000,000, (d) each Lender either 
shall assign all of its Commitment and cease to be a Lender hereunder or 
shall retain, free of any such assignment, an amount of its Commitment of not 
less than $10,000,000 and (e) the parties to such assignment shall execute 
and deliver to the Agent, for recording in the Register (as hereinafter 
defined), an Assignment and Acceptance, substantially in the form of Exhibit 
F hereto (an "Assignment and Acceptance'), together with any Notes subject 
to such assignment. Upon such execution, delivery, acceptance and recording, 
from and after the effective date specified in each Assignment and 
Acceptance, which effective date shall be at least five (5) Business Days 
after the execution thereof, (i) the assignee thereunder shall be a party 
hereto and, to the extent provided in such Assignment and Acceptance, have 
the rights and obligations of a Lender hereunder, and (ii) the assigning 
Lender shall, to the extent provided in such assignment and upon payment to 
the Agent of the registration fee referred to in Section 18.3, be released 
from its obligations under this Agreement.

         Section 18.2. Certain Representations and Warranties; Limitations; 
Covenants. By executing and delivering an Assignment and Acceptance, the 
parties to the assignment thereunder confirm to and agree with each other and 
the other parties hereto as follows: (a) other than the 

                                       75
<PAGE>


representation and warranty that it is the legal and beneficial owner of the 
interest being assigned thereby free and clear of any adverse claim, the 
assigning Lender makes no representation or warranty and assumes no 
responsibility with respect to any statements, warranties or representations 
made in or in connection with this Agreement or the execution, legality, 
validity, enforceability, genuineness, sufficiency or value of this 
Agreement, the other Loan Documents or any other instrument or document 
furnished pursuant hereto; (b) the assigning Lender makes no representation 
or warranty and assumes no responsibility with respect to the financial 
condition of the Borrower or any other Person primarily or secondarily liable 
in respect of any of the Obligations, or the performance or observance by the 
Borrower or any other Person primarily or secondarily liable in respect of 
any of the Obligations of any of their obligations under this Agreement or 
any of the other Loan Documents or any other instrument or document furnished 
pursuant hereto or thereto or the validity or enforceability or priority of 
any lien or any Collateral; (c) such assignee confirms that it has received a 
copy of this Agreement, together with copies of the most recent financial 
statements referred to in Section 6.4 and Section 7.4 and such other 
documents and information as it has deemed appropriate to make its own credit 
analysis and decision to enter into such Assignment and Acceptance; (d) such 
assignee will, independently and without reliance upon the assigning Lender, 
the Agent or any other Lender and based on such documents and information as 
it shall deem appropriate at the time, continue to make its own credit 
decisions and Collateral decisions in taking or not taking action under this 
Agreement, (e) such assignee represents and warrants that it is an Eligible 
Assignee; (f) such assignee appoints and authorizes the Agent to take such 
action as "Agent" on its behalf and to exercise such powers under this 
Agreement and the other Loan Documents as are delegated to the Agent by the 
terms hereof or thereof, together with such powers as are reasonably 
incidental thereto; (g) such assignee agrees that it will perform in 
accordance with their terms all of the obligations that by the terms of this 
Agreement are required to be performed by it as a Lender; and (h) such 
assignee represents and warrants that it is legally authorized to enter into 
such Assignment and Acceptance.

         Section 18.3. Register. The Agent shall maintain a copy of each 
Assignment and Acceptance delivered to it and a register or similar list (the 
"Register") for the recordation of the names and addresses of the Lenders and 
the Commitment Percentages of, and principal amount of the Loans owing to the 
Lenders from time to time. The entries in the Register shall be conclusive, 
in the absence of manifest error, and the Borrower, the Agent and the Lenders 
may treat each Person whose name is recorded in the Register as a Lender 
hereunder for all purposes of this Agreement. The Register shall be available 
for inspection by the Borrower and the Lenders at any reasonable time and 
from time to time upon reasonable prior notice. Upon each such recordation, 
the assigning Lender agrees to pay to the Agent a registration fee in the sum 
of $2,500.00. The Agent may amend Schedules 1 and 1.2 hereof to reflect the 
recording of any such assignments.

         Section 18.4. New Notes. Upon its receipt of an Assignment and 
Acceptance executed by the parties to such assignment, together with each 
Note subject to such assignment, the Agent shall 

                                       76
<PAGE>


(a) record the information contained therein in the Register, and (b) give 
prompt notice thereof to the Borrower and the Lenders (other than the 
assigning Lender ). Within five (5) Business Days after receipt of such 
notice, the Borrower, at its own expense, shall execute and deliver to the 
Agent, in exchange for each surrendered Note, a new Note to the order of such 
Eligible Assignee in an amount equal to the amount assumed by such Eligible 
Assignee pursuant to such Assignment and Acceptance and, if the assigning 
Lender has retained some portion of its Loans hereunder, a new Note to the 
order of the assigning Lender in an amount equal to the amount retained by it 
hereunder. Such new Notes shall provide that they are replacements for the 
surrendered Notes and that they do not constitute a novation, shall be in an 
aggregate principal amount equal to the aggregate principal amount of the 
surrendered Notes, shall be dated the effective date of such Assignment and 
Acceptance and shall otherwise be in substantially the form of the assigned 
Notes. Within five (5) days of issuance of any new Notes pursuant to this 
Section 18.4, the Borrower shall deliver an opinion of counsel, addressed to 
the Lenders and the Agent, relating to the due authorization, execution and 
delivery of such new Notes and the legality, validity and binding 
non-preferential effect thereof, and that the Obligations evidenced by the 
new Notes are secured by the Collateral with the same validity, 
enforceability and priority as if given on the Effective Date, in form and 
substance satisfactory to the Lenders. The surrendered Notes shall be 
cancelled and returned to the Borrower.

         Section 18.5. Participations. Each Lender may sell participations to 
one or more banks or other entities in a portion of such Lender's rights and 
obligations under this Agreement and the other Loan Documents not to exceed 
forty-nine percent (49%) of its Commitment Percentage; provided that (a) the 
Agent shall have given its prior written consent to such participation, 
except that any Lender may sell participations to its Affiliated Lenders 
without such consent, (b) each such participation shall be in an amount of 
not less than $10,000,000 that is a whole multiple of $1,000,000, (c) any 
such sale or participation shall not affect the rights and duties of the 
selling Lender hereunder to the Borrower and the Lender shall continue to 
exercise all approvals, disapprovals and other functions of a Lender, (d) 
the only rights granted to the participant pursuant to such participation 
arrangements with respect to waivers, amendments or modifications of the Loan 
Documents shall be the rights to approve the vote of the Lender as to 
waivers, amendments or modifications that would reduce the principal of or 
the interest rate on any Loans, extend the term or increase the amount of the 
Commitment of such Lender as it relates to such participant, reduce the 
amount of any fees to which such participant is entitled or extend any 
regularly scheduled payment date for principal or interest, provided that all 
approvals affecting a Loan or this Agreement under this clause (d) shall be 
by a fifty-one percent (51%) vote of such Lender's Commitment Percentage, 
and (e) no participant shall have the right to grant further participations 
or assign its rights, obligations or interests under such participation to 
other Persons without the prior written consent of the Agent. The Agent shall 
promptly advise the Borrower in writing of any such sale or participation.

         Section 18.6. Pledge by Lender. Any Lender may at any time pledge 
all or any portion of its interest and rights under this Agreement (including 
all or any portion of its Note) to any of the 

                                       77
<PAGE>

twelve Federal Reserve Lenders organized under Section 4 of the Federal 
Reserve Act, 12 U.S.C. Section 341. No such pledge or the enforcement thereof 
shall release the pledgor Lender from its obligations hereunder or under any 
of the other Loan Documents.

         Section 18.7. No Assignment by Borrower. The Borrower shall not 
assign or transfer any of its rights or obligations under any of the Loan 
Documents without the prior written consent of each of the Lenders.

         Section 18.8. Disclosure. The Borrower agrees that in addition to 
disclosures made in accordance with standard banking practices any Lender may 
disclose information obtained by such Lender pursuant to this Agreement to 
assignees or participants and potential assignees or participants hereunder. 
Such Lender shall obtain from each party to whom it discloses such 
information, the agreement by such party to comply with the Lenders' 
agreements with respect to Confidential Information set forth in Section 7.9.

         Section 19. NOTICES, ETC. Except as otherwise expressly provided in 
this Agreement, all notices and other communications made or required to be 
given pursuant to this Agreement or the Notes shall be in writing and shall 
be delivered in hand, mailed by United States registered or certified first 
class mail, postage prepaid, sent by overnight courier, or sent by telegraph, 
telecopy, telefax or telex and confirmed by delivery via courier or postal 
service, addressed as follows:

                  (a) if to the Borrower, at 77 West Wacker Drive, Suite 
3900, Chicago, IL 60601, Attention: Chief Financial Officer or at such other 
address for notice as the Borrower shall last have furnished in writing to 
the Agent; and

                  (b) if to the Agent, at 100 Federal Street, Boston, 
Massachusetts 02110, Attention: Real Estate Department, and to 115 Perimeter 
Center Place, N.E., Suite 500, Atlanta, Georgia 30346, Attn: Lori Y. Litow, 
Vice President, or such other address for notice as the Agent shall last have 
furnished in writing to the Borrower.

                  (c) if to any Lender, at such Lender's address set forth 
on Schedule 1, hereto, or such other address for notice as such Lender shall 
have last furnished in writing to the Person giving the notice.

         Any such notice or demand shall be deemed to have been duly given or 
made and to have become effective (i) if delivered by hand, overnight courier 
or facsimile to a responsible officer of the party to which it is directed, 
at the time of the receipt thereof by such officer or the sending of such 
facsimile and (ii) if sent by registered or certified first-class mail, 
postage prepaid, on the third Business Day following the mailing thereof.

                                       78
<PAGE>

         Section 20. GOVERNING LAW; CONSENT TO JURISDICTION AND SERVICE. THIS 
AGREEMENT AND EACH OF THE OTHER LOAN DOCUMENTS, EXCEPT AS OTHERWISE 
SPECIFICALLY PROVIDED THEREIN, ARE CONTRACTS UNDER THE LAWS OF THE STATE OF 
NEW YORK AND SHALL FOR ALL PURPOSES BE CONSTRUED IN ACCORDANCE WITH AND 
GOVERNED BY THE LAWS OF SUCH STATE (EXCLUDING THE LAWS APPLICABLE TO 
CONFLICTS OR CHOICE OF LAW). THE BORROWER AGREES THAT ANY SUIT BY IT FOR THE 
ENFORCEMENT OF THIS AGREEMENT OR ANY OF THE OTHER LOAN DOCUMENTS MAY BE 
BROUGHT IN THE COURTS OF THE COMMONWEALTH OF MASSACHUSETTS OR THE STATE OF 
NEW YORK OR ANY FEDERAL COURT SITTING THEREIN AND BORROWER CONSENTS TO THE 
NONEXCLUSIVE JURISDICTION OF SUCH COURT FOR ANY SUIT BY AGENT OR ANY LENDER 
AND THE SERVICE OF PROCESS IN ANY SUCH SUIT BEING MADE UPON THE BORROWER BY 
MAIL AT THE ADDRESS SPECIFIED IN Section 19. THE BORROWER HEREBY WAIVES ANY 
OBJECTION THAT IT MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH SUIT OR 
ANY SUCH COURT OR THAT SUCH SUIT IS BROUGHT IN AN INCONVENIENT COURT. IN 
ADDITION TO THE COURTS OF MASSACHUSETTS AND NEW YORK OR ANY FEDERAL COURT 
SITTING THEREIN, THE AGENT OR ANY LENDER MAY BRING ACTION(S) FOR ENFORCEMENT 
ON A NONEXCLUSIVE BASIS WHERE ANY COLLATERAL EXISTS AND THE BORROWER CONSENTS 
TO THE NON-EXCLUSIVE JURISDICTION OF SUCH COURT AND THE SERVICE OF PROCESS IN 
ANY SUCH SUIT BEING MADE UPON THE BORROWER BY MAIL AT THE ADDRESS SPECIFIED 
IN Section 19.

         Section 21. HEADINGS. The captions in this Agreement are for 
convenience of reference only and shall not define or limit the provisions 
hereof.

         Section 22. COUNTERPARTS. This Agreement and any amendment hereof 
may be executed in several counterparts and by each party on a separate 
counterpart, each of which when so executed and delivered shall be an 
original, and all of which together shall constitute one instrument. In 
proving this Agreement it shall not be necessary to produce or account for 
more than one such counterpart signed by the party against whom enforcement 
is sought.

         Section 23. ENTIRE AGREEMENT. The Loan Documents and any other 
documents executed in connection herewith or therewith express the entire 
understanding of the parties with respect to the transactions contemplated 
hereby. Neither this Agreement nor any term hereof may be changed, waived, 
discharged or terminated, except as provided in Section 25.

         Section 24. WAIVER OF JURY TRIAL AND CERTAIN DAMAGE CLAIMS. THE 
BORROWER HEREBY WAIVES ITS RIGHT TO A JURY TRIAL WITH RESPECT TO ANY ACTION 
OR CLAIM ARISING OUT OF ANY DISPUTE IN CONNECTION WITH THIS AGREEMENT, THE 
NOTES OR ANY OF THE OTHER LOAN DOCUMENTS, ANY RIGHTS OR OBLIGATIONS HEREUNDER 
OR THEREUNDER OR THE PERFORMANCE

                                       79
<PAGE>

OF SUCH RIGHTS AND OBLIGATIONS. EXCEPT TO THE EXTENT EXPRESSLY PROHIBITED BY 
LAW, THE BORROWER HEREBY WAIVES ANY RIGHT IT MAY HAVE TO CLAIM OR RECOVER IN 
ANY LITIGATION REFERRED TO IN THE PRECEDING SENTENCE ANY SPECIAL, EXEMPLARY, 
PUNITIVE OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES OTHER THAN, OR IN ADDITION 
TO, ACTUAL DAMAGES. THE BORROWER (A) CERTIFIES THAT NO REPRESENTATIVE, AGENT 
OR ATTORNEY OF THE AGENT OR ANY LENDER HAD REPRESENTED, EXPRESSLY OR 
OTHERWISE, THAT THE AGENT OR SUCH LENDER WOULD NOT, IN THE EVENT OF 
LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVERS AND (B) ACKNOWLEDGES THAT 
THE AGENT AND THE BANKS HAVE BEEN INDUCED TO ENTER INTO THIS AGREEMENT AND 
THE OTHER LOAN DOCUMENTS TO WHICH THEY ARE PARTIES BY, AMONG OTHER THINGS, 
THE WAIVERS AND CERTIFICATIONS CONTAINED HEREIN.

         Section 25. CONSENTS, AMENDMENTS, WAIVERS, ETC. Any consent or 
approval required or permitted by this Agreement may be given, and any term 
of this Agreement or of any other instrument related hereto or mentioned 
herein may be amended, and the performance or observance by the Borrower of 
any terms of this Agreement or such other instrument or the continuance of 
any Default or Event of Default may be waived (either generally or in a 
particular instance and either retroactively or prospectively) with, but only 
with, the written consent of the Requisite Lenders, and, in the case of 
amendments, with the written consent of the Borrower other than amendments to 
schedules made in the ordinary course as contemplated by this Agreement. 
Notwithstanding the foregoing, (i) the rate of interest on and the term or 
amount of the Notes, (ii) the amount of the Commitments of the Lenders, (iii) 
the amount of any fee payable to a Lender hereunder, (iv) any provision 
herein or in any of the Loan Documents which expressly requires consent of 
all the Lenders, (v) the funding provisions of Section 2.4 and Section 2.5 
hereof, and (vi) the rights, duties and obligations of the Agent specified in 
Section 14 hereof, may not be amended without the written consent of each 
Lender affected thereby, nor may the Agent release any obligor from its 
liability with respect to the Obligations, without first obtaining the 
written consent of all the Lenders. No waiver shall extend to or affect any 
obligation not expressly waived or impair any right consequent thereon. No 
course of dealing or delay or omission on the part of the Agent or any Lender 
in exercising any right shall operate as a waiver thereof or otherwise be 
prejudicial thereto. No notice to or demand upon the Borrower shall entitle 
the Borrower to other or further notice or demand in similar or other 
circumstances.

         Section 26. SEVERABILITY. The provisions of this Agreement are 
severable, and if any one clause or provision hereof shall be held invalid or 
unenforceable in whole or in part in any jurisdiction, then such invalidity 
or unenforceability shall affect only such clause or provision, or part 
thereof, in such jurisdiction, and shall not in any manner affect such clause 
or provision in any other jurisdiction, or any other clause or provision of 
this Agreement in any jurisdiction.

                                       80
<PAGE>

         Section 27. ACKNOWLEDGMENTS. The Borrower hereby acknowledges that: 
(i) neither the Agent nor any Lender has any fiduciary relationship with, or 
fiduciary duty to, the Borrower arising out of or in connection with this 
Agreement or any of the other Loan Documents; (ii) the relationship in 
connection herewith between the Agent and the Lenders, on the one hand, and 
the Borrower, on the other hand, is solely that of debtor and creditor and 
(iii) no joint venture or partnership among any of the parties hereto is 
created hereby or by the other Loan Documents, or otherwise exists by virtue 
of the Facility or the Loans.

         Section 28. PARTNER LIABILITY.

         Section 28.1. Limited Recourse to Company. Notwithstanding anything 
expressed or implied to the contrary contained herein, the Company shall not 
be liable hereunder or under any Guaranty or under any legal or equitable 
proceeding or by virtue of any statute, regulation or other applicable law 
for (i) any payment of principal or interest on, or any other amounts due 
under, any of the Loans, or (ii) any reimbursement obligation with respect to 
a Drawing under a Letter of Credit, or (iii) to repay any other indebtedness 
of Borrower or any Guarantor, provided, however, that nothing herein shall be 
construed to prevent the Agent or any Lender from recovering from the 
Company, or limit the Agent's or any Lender's recourse against the Company 
for any losses, damages or costs (including, without limitation, reasonable 
legal expenses), incurred by the Agent or any Lender in connection with the 
Company's breach of the Company's own covenants and agreements herein or in 
the Indemnity Agreement, or in connection with the Company's fraud, 
misappropriation of funds (whether due to the Company's failure to contribute 
Net Offering Proceeds to the Borrower, as required by Section 7.20, or its 
receipt of Distributions from the Borrower in violation of Section  8.7, or 
otherwise) or any misrepresentation made by or on behalf of the Company 
hereunder or in connection with the transactions contemplated hereby.

         Section 28.2. Limited Recourse to Partners of Borrower other than 
the Company. With respect to all partners of the Borrower other than the 
Company, no personal deficiency judgment or any other judgment shall be 
asserted or enforced against any such partner for payment of any amount 
hereunder or for observance or performance of any of the obligations of the 
Borrower contained herein, except as expressly set forth in this agreement or 
any other agreement or instrument or document as an obligation of such 
partner in connection herewith, and provided that the foregoing shall not 
affect the liability which any of such other partners may have for any fraud, 
misappropriation of funds or intentional misrepresentation made hereunder by 
or on behalf of the Borrower or in connection with the transactions 
contemplated hereby.

                                       81
<PAGE>

         IN WITNESS WHEREOF, the undersigned have duly executed this 
Agreement as a sealed instrument as of the date first set forth above.

<TABLE>
<CAPTION>

<S>                                                 <C>   
WITNESS:                                             BANKBOSTON, N.A.

- ----------------------------------------             By:    
                                                        ----------------------------------------
                                                        Lori Y. Litow
                                                        Its:  Vice Presiden
                                                           ----------------------------------------

                                                     PRUDENTIAL SECURITIES CREDIT
                                                     CORPORATION

                                                     By: /s/ George D. Morgan
- ----------------------------------------                ----------------------------------------
                                                        George D. Morgan
                                                        Its:   Vice President
                                                               ----------------------------------------

                                                     PRIME GROUP REALTY TRUST

- ----------------------------------------             By:
                                                        ----------------------------------------

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

                                                        Its:
                                                              ----------------------------------------

                                                     PRIME GROUP REALTY, L.P. 

                                                     By: PRIME GROUP REALTY TRUST,
                                                         its general partner

- ----------------------------------------             By:
                                                        ----------------------------------------

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

                                                        Its:
                                                              ----------------------------------------
</TABLE>

<PAGE>

         IN WITNESS WHEREOF, the undersigned have duly executed this 
Agreement as a sealed instrument as of the date first set forth above.

<TABLE>
<CAPTION>

<S>                                                 <C>   
WITNESS:                                             BANKBOSTON, N.A.

/s/Nancy Johns
- ----------------------------------------             By: /s/ Lori Y. Litow
                                                        ----------------------------------------
                                                        Lori Y. Litow
                                                        Its:  Vice President

                                                     PRUDENTIAL SECURITIES CREDIT
                                                     CORPORATION

                                                     By:    
- ----------------------------------------                ----------------------------------------
                                                            
                                                        ----------------------------------------

                                                        Its:   
                                                               ----------------------------------------

                                                     PRIME GROUP REALTY TRUST
/s/Illegible
- ----------------------------------------             By: /s/ W. Michael Karnes
                                                        ----------------------------------------
                                                        W. Michael Karnes 

                                                        Its:   Executive VP

                                                     PRIME GROUP REALTY, L.P. 

                                                     By: PRIME GROUP REALTY TRUST,
                                                         its general partner
/s/Illegible
- ----------------------------------------             By: /s/ W. Michael Karnes 
                                                        ----------------------------------------
                                                        W. Michael Karnes 

                                                        Its:   Executive VP

</TABLE>

<PAGE>

                                    Exhibit A

                                   FORM OF NOTE

No. ___                                                                   [Date]
[Amount]

         FOR VALUE RECEIVED, the undersigned, Prime Group Realty, L.P., a 
Delaware limited partnership (the "Borrower"), promises to pay to the order 
of [Name of Lender] (hereinafter, together with its successors in title and 
assigns, called the "Lender") at the head office of BankBoston, N.A., as 
Agent (the "Agent") at 100 Federal Street, Boston, Massachusetts 02110, the 
principal sum of [Amount in Words][Amount in Numbers] or, if less, the 
aggregate unpaid principal amount of all Loans made by the Lender to the 
Borrower pursuant to the Credit Agreement dated as of November 17, 1997 among 
the Lender, the Borrower, Prime Group Realty Trust, the other lending 
institutions named therein and the Agent, as amended from time to time (the 
"Credit Agreement"). Capitalized terms used herein and not otherwise defined 
herein shall have the meanings assigned to them in the Credit Agreement. 
Unless otherwise provided herein, the rules of interpretation set forth in 
Section 1.2 of the Credit Agreement shall be applicable to this Note.

         The Borrower also promises to pay (a) principal from time to time at 
the times provided in the Credit Agreement and (b) interest from the date 
hereof on the principal amount from time to time unpaid at the rates and 
times set forth in the Credit Agreement and in all cases in accordance with 
the terms of the Credit Agreement. Late charges and other charges and default 
rate interest shall be paid by Borrower in accordance with the terms of the 
Credit Agreement. The entire outstanding principal amount of this Note, 
together with all accrued but unpaid interest thereon, shall be due and 
payable in full on the Maturity Date. The Lender may endorse the record 
relating to this Note with appropriate notations evidencing advances and 
payments of principal hereunder as contemplated by the Credit Agreement.

         This Note is issued pursuant to, is entitled to the benefits of, and 
is subject to the provisions of the Credit Agreement. The principal of this 
Note is subject to prepayment in whole or in part in the manner and to the 
extent specified in the Credit Agreement. This Note is secured by the 
Security Documents. However, the principal of this Note, the interest accrued 
on this Note and all other Obligations of the Borrower are full recourse 
obligations of the Borrower, and all of its Real Estate Assets, the 
Collateral and its other properties shall be available for the payment and 
performance of this Note, the interest accrued on this Note, and all of such 
other Obligations. The liability of the partners of the Borrower hereunder is 
limited as set forth in Section 28 of the Credit Agreement.

         In case an Event of Default shall occur and be continuing, the 
entire unpaid principal amount of this Note and all of the unpaid interest 
accrued thereon may become or be declared due and payable in the manner and 
with the effect provided in the Credit Agreement.

         The Borrower and all endorsers hereby waive presentment, demand, 
protest and notice of any kind in connection with the delivery, acceptance, 
performance and enforcement of this Note, and also hereby assent to 
extensions of time of payment or forbearance or other indulgences without 
notice.

         THIS NOTE AND THE OBLIGATIONS OF THE BORROWER HEREUNDER SHALL BE 
GOVERNED BY AND INTERPRETED AND DETERMINED IN ACCORDANCE WITH THE LAWS OF THE 
STATE OF NEW YORK (EXCLUDING THE LAWS APPLICABLE TO CONFLICTS OR CHOICE OF 
LAW).

         IN WITNESS WHEREOF, the Borrower has caused this Note to be duly 
executed in its name as an instrument under seal on the date first above 
written.

WITNESS:                                   PRIME GROUP REALTY, L.P.
                                           By: Prime Group Realty Trust,
                                           its managing general partner

                                          By:
- -----------------------------------          -----------------------------------


<PAGE>

                                    Exhibit B

                                  LOAN REQUEST

                            Prime Group Realty, L.P.
                        77 West Wacker Drive, Suite 3900
                                Chicago, IL 60601

                                                                         [Date]

BankBoston, N.A., as Agent
100 Federal Street
Boston, MA 02110

Ladies and Gentlemen:

         Re:  Loan Request under Credit Agreement
                  dated as of November 17, 1997

         Pursuant to Section 2.5 of the Credit Agreement dated as of November 
17, 1997, among you, certain other Lenders and us (the "Credit Agreement"), 
we hereby request that you make a Loan as follows:

           (i)  Principal amount requested: $
                                             -----------
          (ii)  Proposed Borrowing Date:
                                        ----------------
         (iii)  Interest Period:
                               -------------------------
          (iv)  Type:
                     -----------------------------------

           (v)  Purpose of Loan:  
                                    -----------------------------------

         This Loan Request is submitted pursuant to, and shall be governed 
by, and subject to satisfaction of, the terms, conditions and provisions set 
forth in Section 2.5 of the Credit Agreement.

 
                                       
<PAGE>

         The undersigned hereby further certifies to you that it is in 
compliance with the covenants specified in Section 9 of the Credit Agreement, 
and will remain in compliance with such covenants after the making of the 
requested Loan, as evidenced by a Compliance Certificate in the form of 
Exhibit C to the Credit Agreement of even date herewith delivered to you 
simultaneously with this Loan Request.

         We also understand that if you grant this request this request 
obligates us to accept the requested Loan on such date. All terms defined in 
the Credit Agreement and used herein without definition shall have the 
meanings set forth in Section 1.1 of the Credit Agreement.

         The undersigned hereby certifies to you, in accordance with the 
provisions of Section 11.1 of the Credit Agreement, that the representations 
and warranties contained in the Credit Agreement and in each document and 
instrument delivered pursuant to or in connection therewith were true as of 
the date as of which they were made, are also true at and as of the date 
hereof, and will also be true at and as of the proposed Borrowing Date of the 
Loan requested hereby, in each case except as otherwise permitted pursuant to 
the provisions of Section 11.1 of the Credit Agreement, and no Default or 
Event of Default has occurred and is continuing.

                                             Very truly yours,



                                             Prime Group Realty, L.P.
                                             By: Prime Group Realty Trust,
                                                 Its managing general partner

                                             By:
                                                -------------------------------

                                                -------------------------------
                                                Its:
                                                     --------------------------

                                       
<PAGE>

                                    Exhibit C

                            Prime Group Realty, L.P.
                        77 West Wacker Drive, Suite 3900
                                Chicago, IL 60601

                          Compliance Certificate under
                 Credit Agreement dated as of November 17, 1997

         The undersigned, a Responsible Officer of Prime Group Realty Trust, 
general partner of Prime Group Realty, L.P. (the "Borrower"), hereby 
certifies on behalf of the Borrower as of the date hereof the following:

         1. No Defaults. I have read a copy of the Credit Agreement dated as 
of November 17, 1997 (the "Credit Agreement") among the Borrower, BankBoston, 
N.A., the other lending institutions party thereto, and BankBoston, N.A., as 
Agent. Terms used herein and not otherwise defined herein shall have the 
meanings set forth in Section 1.1 of the Credit Agreement. No Default is 
continuing in the performance or observance of any of the covenants, terms or 
provisions of the Credit Agreement or any of the other Loan Documents. 
Without limiting the foregoing, the Borrower has not taken any actions which 
are prohibited by the negative covenants set forth in Section 8 of the Credit 
Agreement. Attached hereto as Appendix I are all relevant calculations needed 
to determine whether the Borrower is in compliance with Section 9 and Section 
8.3(g) of the Credit Agreement as of the end of the most recently completed 
fiscal quarter (except that in the case of Compliance Certificates delivered 
pursuant to Section 2.5(a), Section 2.9(b) Section 11.1, Section 5.5(a) or 
Section 8.4(b), the calculations determining compliance with Section 9.1, 
Section 9.2 and Section 9.3 are based on a Pro Forma Principal Amount (after 
giving effect to the proposed transaction) and is in compliance with Section 
8.7 of the Credit Agreement for the most recently completed fiscal year.

         2. No Material Changes, Etc. Except as disclosed on Appendix II 
hereto, since the [date of most recent financial statements furnished to the
Agent and the Lenders], there have occurred no materially adverse changes in
the financial condition or business of the Borrower as shown on or reflected 
in the balance sheet of the Borrower as at such date other than (a) changes 
in the ordinary course of business that have not had any materially adverse 
effect either individually or in the aggregate on the business or financial 
condition of the Borrower and (b) changes resulting from the making of the 
Loans and the transactions contemplated by the Credit Agreement.

         3. No Materially Adverse Contracts, Etc. Neither the Borrower nor 
the Company is subject to any charter, corporate, trust, partnership or other 
legal restriction, or any judgment, decree, order, rule or regulation that 
has or is expected, in the reasonable judgment of the Company's officers, in 
the future to have a Materially Adverse Effect. Neither the Borrower nor the 
Company is a party to any contract or agreement that has or is expected, in 
the reasonable judgment of the Company's officers, to have a Materially 
Adverse Effect.

<PAGE>

                                             Prime Group Realty, L.P.
                                             By: Prime Group Realty Trust,
                                             Its managing general partner

                                             By:
                                                -------------------------------

                                                -------------------------------
                                                Its:
                                                     --------------------------

Date:

<PAGE>

                                                                      Appendix I

                         FINANCIAL COVENANT CALCULATIONS

Note:  Unless otherwise indicated all calculations are as of 
       or for the fiscal quarter ending on such date (the "Fiscal Quarter").

<TABLE>
<CAPTION>

<S>                                                                               <C>  
1. Appraisal Value [Section 9.1]

   (a)      Pro Forma Principal Amount                                              $_____________

   (b)      Collateral Value of Mortgaged                                           $_____________
            Properties (see attached Schedule
            of Collateral Values)

   CALCULATIONS:    (a)/(b) = ____% which is less than 60%

2. Minimum Debt Service Coverage [Section 9.2]

   (a)      Net Operating Income for all of the Mortgaged Properties:               $_____________

   (b)      Pro Forma Debt Service Charges for Mortgaged Properties based
            on three monthly payments of mortgage style amortization of
            the Pro Forma Principal Amount of $_______________ amortized
            over 25 years at _______% per annum, being the greater of the
            current average interest rate on the Loans or 1.75% above the 
            current ten year U.S. Treasury bill yield:                              $_____________



   CALCULATIONS:    (a)/(b) = _________ which is not less than 1.5


</TABLE>

<PAGE>
<TABLE>
<CAPTION>

<S>                                                                              <C>  
3. Total Liabilities to Total Adjusted Assets [Section 9.3]

   (a)      Total Liabilities:                                                     $_____________
   (b)      Cash and cash equivalents:                                             $_____________
   (c)      EBITDA last quarter:                                                   $_____________
   (d)      EBITDA previous quarter:                                               $_____________
   (e)      Annualized EBITDA [(c) + (d) times 2]:                                 $_____________
   (f)      Line (e) divided by 0.0975:                                            $_____________
   (g)      Total Adjusted Assets [(b) + (f)]:                                     $_____________

   CALCULATIONS:    (a)/(g)  =         which is less than 55%
                              ---------

4. Minimum Tangible Net Worth [Section 9.4]

   (a)      Total Assets (GAAP assets plus depreciation
            on Real Estate Assets)                                                 $_____________
   (b)      Total Liabilities (same as line 3(a))                                  $_____________
   (c)      Intangibles                                                            $_____________
   (d)      Tangible Net Worth [(a)-(b)-(c)]                                       $_____________
   (e)      Net Offering Proceeds                                                  $_____________
   (f)      $350,000,000 plus .75 times (e)                                        $_____________

   COVENANT: Line (d) should exceed line (f)

5. Total Operating Cash Flow to Interest Expense [Section 9.5]

   (a)      EBITDA (same as line 3(c))                                             $_____________
   (b)      Gross leasable area of all Real Estate Assets                           ______________
   (c)      Reserve Amount ((c) times $0.25 divided by 4)                          $_____________
   (d)      Total Operating Cash Flow [(a) - (c)]                                  $_____________
   (e)      Interest Expense (includes capitalized interest)                       $_____________

   CALCULATIONS: (d)/(e) = _____ which is not less than 2.0

6. EBITDA to Fixed Charges [Section 9.6]

   (a)      EBITDA (same as line 3(c))                                             $_____________
   (b)      Interest Expense (same as line 5(e))                                   $_____________
   (c)      Principal installments and current maturities                          $_____________
            not refinanced
   (d)      Preferred dividends and distributions                                  $_____________
   (e)      Fixed Charges (sum of lines (b), (c), and (d))                         $_____________

   CALCULATIONS: (a)/(e) = ____________which is not less than 1.75
</TABLE>

                                       
<PAGE>
<TABLE>
<CAPTION>

<S>                                                                               <C>     
8. Investments in Permitted Developments [Section 8.3(g)]
   Attached hereto is a Schedule of all Permitted Developments
   in process as of ________________

   (a)      Investments in Permitted Developments                                  $_____________
   (b)      Total Adjusted Assets (same as line 3(g))                              $_____________
   (c)      20% of Total Adjusted Assets                                           $_____________

   COVENANT:

   Line (a) should not exceed line (c)

9. Distributions [Section 8.7]

   (a)      Total Distributions during most recently ended                         $_____________
            fiscal year
   (b)      Funds From Operations for said fiscal year                             $_____________
   (c)      Total Distributions during most recently ended                         $_____________
            fiscal quarter
   (d)      Funds from Operations for fiscal quarter referenced                    $_____________
            in (c)
   (e)      Total Distributions during the fiscal quarter preceding                $_____________
            the fiscal quarter referenced in (c)

   (f)      Funds from Operations during fiscal quarter referenced                 $_____________
            in (e)
   (g)      Total Distributions during the fiscal quarter preceding                $_____________
            the fiscal quarter referenced in (e)

   (h)      Funds from Operations during fiscal quarter referenced                 $_____________
            in (g)

   CALCULATIONS:              (a)/(b) = _____% which is less than 90%
                              (c)/(d) = _____%
                              (e)/(f) = _____%
                              (g)/(h) = _____%
</TABLE>

         At least one of the three percentages immediately above is less than 
100%

<PAGE>

                          SCHEDULE OF COLLATERAL VALUES

<TABLE>
<CAPTION>
                                                                             
                                                                             Borrowing
Mortgaged           NOI              NOI              Reserve       Cap         Base        Appraised      
Collateral
Property           Last Q         Previous Q          Amount        Rate        Value         Value          Value
 --------          ------         ----------          ------        ----        -----         -----          -----
<S>     <C>   






Totals:
</TABLE>
                                       
<PAGE>



                                   SCHEDULE OF
                             PERMITTED DEVELOPMENTS

<TABLE>
<CAPTION>

                                                                                 Scheduled
Project Location     Size (sq. ft.)     Total Project Cost     Start Date      Completion Date
- ----------------     --------------     ------------------     ----------      ---------------
<S>     <C>    

</TABLE>


<PAGE>

                                                                     APPENDIX II

                                MATERIAL CHANGES

<PAGE>

                                    Exhibit D

                            LETTER OF CREDIT REQUEST

                            Prime Group Realty, L.P.
                        77 West Wacker Drive, Suite 3900
                                Chicago, IL 60601

                                            [Date]

BankBoston, N.A., as Agent
100 Federal Street
Boston, MA 02110

Ladies and Gentlemen:

         Re:      Letter of Credit Request under Credit
                  Agreement dated as of November 17, 1997

         Pursuant to Section 2.9 of the Credit Agreement dated as of November 
17, 1997, among you, Prime Group Realty Trust, certain other Lenders and us 
(the "Credit Agreement"), we hereby request that you issue 
[extend or renew, if applicable] a Letter of Credit as follows:

           (i)             Name and address of beneficiary:

           (ii)            Face amount: $

          (iii)            Proposed Issuance Date:

                           Proposed Expiration Date:

          (iv)             Other terms and conditions as set forth in the
                           proposed form of Letter of Credit attached hereto.

           (v)             Purpose of Letter of Credit:

<PAGE>

         This Letter of Credit Request is submitted pursuant to, and shall be
governed by, and subject to satisfaction of, the terms, conditions and
provisions set forth in Section 2.9 of the Credit Agreement.

         The undersigned hereby further certifies to you that it is in 
compliance with the covenants specified in Section 9 of the Credit Agreement, 
and will remain in compliance with such covenants after the Outstanding 
Principal Amount is adjusted to include the face amount of the requested 
Letter of Credit, as evidenced by a Compliance Certificate in the form of 
Exhibit C to the Credit Agreement of even date herewith delivered to you 
simultaneously with this Letter of Credit Request.

         We also understand that if you grant this request this request 
obligates us to accept the requested Letter of Credit 
[or extension or renewal thereof] and pay the issuance fee 
[or the renewal fee] and Letter of Credit fee as required by Section 2.9(c). 
All terms defined in the Credit Agreement and used herein without definition 
shall have the meanings set forth in Section 1.1 of the Credit Agreement.

         The undersigned hereby certifies to you, in accordance with the
provisions of Section 11.1 of the Credit Agreement, that the representations and
warranties contained in the Credit Agreement and in each document and instrument
delivered pursuant to or in connection therewith were true as of the date as of
which they were made, are also true at and as of the date hereof, and will also
be true at and as of the proposed issuance date of the Letter of Credit
requested hereby, in each case except as otherwise permitted pursuant to the
provisions of Section 11.1 of the Credit Agreement, and no Default or Event of
Default has occurred and is continuing.

                                        Very truly yours,

                                        Prime Group Realty, L.P.
                                        By: Prime Group Realty Trust,
                                            Its general partner

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

<PAGE>

                                    EXHIBIT F

                                     FORM OF
                            ASSIGNMENT AND ACCEPTANCE

                                            Dated

         Reference is made to the Credit Agreement, dated as of November 17,
1997 (as amended and in effect from time to time, the "Agreement"), among Prime
Group Realty, L.P., a Delaware limited partnership (the "Borrower"), BankBoston,
N.A., the other Lenders and BankBoston, N.A. as agent (the "Agent") for itself
and the other Lenders. Capitalized terms used herein and not otherwise defined
shall have the meanings assigned to such terms in the Agreement.

                                                            (the "Assignor") and
- ------------------------------------------------------------
                                          (the "Assignee") agree as follows:
- -------------------------------------------

         1. The Assignor hereby sells and assigns to the Assignee, and the 
Assignee hereby purchases and assumes from the Assignor, a   % interest in 
and to all the Assignor's rights and obligations under the Agreement as of 
the Effective Date (as hereinafter defined).

         2. The Assignor (i) represents that as of the date hereof, its
Commitment (without giving effect to assignments thereof which have not yet
become effective) is $__________ and its Commitment Percentage with respect
thereto is   %, and the outstanding balance of its Loans (unreduced by any
assignments thereof which have not yet become effective) is $__________; (ii)
makes no representation or warranty and assumes no responsibility with respect
to any statements, warranties or representations made in or in connection with
the Agreement or the execution, legality, validity, enforceability, genuineness,
sufficiency or value of the Agreement, the other Loan Documents or any other
instrument or document furnished pursuant thereto on the status or value of any
Collateral, other than that it is the legal and beneficial owner of the interest
being assigned by it hereunder and that such interest is free and clear of any
adverse claim; (iii) makes no representation or warranty and assumes no
responsibility with respect to the financial condition of the Borrower or any of
its Subsidiaries or any other person which may be primarily or secondarily
liable in respect of any of the Obligations or any of their obligations under
the Agreement or the other Loan Documents or any other instrument or document
delivered or executed pursuant thereto; and (v) attaches the Note delivered to
it under the Agreement and requests that the Borrower exchange such Note for new
Notes payable to each of the Assignor and the Assignee as follows:

<PAGE>

Notes Payable to                           Amount
the Order of:                             of Note
- -----------------                         -------
[Name of Assignor]                        [($     )]

[Name of Assignee]                        [($     )]

         3. The Assignee (i) represents and warrants that it is legally
authorized to enter into this Assignment and Acceptance; (ii) confirms that it
has received a copy of the Agreement, together with copies of the most recent
financial statements delivered pursuant to Sections 6.4 and 7.4 thereof and such
other documents and information as it has deemed appropriate to make its own
credit analysis and decision to enter into this Assignment and Acceptance; (iii)
agrees that it will, independently and without reliance upon the Assignor, any
other Lender or the Agent and based on such documents and information as it
shall deem appropriate at the time, continue to make its own credit decisions
and review and analysis of the granting and perfecting of any purported liens
and the status and value of any Collateral in taking or not taking action under
the Agreement; (iv) confirms that it is an Eligible Assignee; (v) appoints and
authorizes the Agent to take such action as agent on its behalf and to exercise
such powers as are reasonably incidental thereto pursuant to the terms of the
Agreement and the other Loan Documents; and (vi) agrees that it will perform all
the obligations which by the terms of the Agreement are required to be performed
by it as a Lender in accordance with the terms of the Agreement.

         4. The effective date for this Assignment and Acceptance shall be    
        (the "Effective Date"). Following the execution of this Assignment 
and Acceptance, it will be delivered to the Agent for acceptance and 
recording in the Register by the Agent. This Assignment and Acceptance may be 
executed in several counterparts and by each party on a separate counterpart, 
each of which when so executed and delivered shall be an original, and all of 
which together shall constitute one instrument. In proving this Assignment 
and Acceptance it shall not be necessary to produce or account for more than 
one such counterpart signed by the party against whom enforcement is sought.

         5. Upon such acceptance and recording, from and after the Effective
Date, (i) the Assignee shall be a party to the Agreement and, to the extent
provided in this Assignment and Acceptance, have the rights and obligations of a
Lender thereunder, and (ii) the Assignor shall, with respect to that portion of
its interest under the Agreement assigned hereunder relinquish its rights and be
released from its obligations under the Agreement.

         6. Upon such acceptance and recording, from and after the Effective
Date, the Agent shall make all payments in respect of the interest assigned
hereby (including payments of principal, interest, fees and other amounts) to
the Assignee. The Assignor and Assignee shall make all appropriate adjustments
in payments for periods prior to the Effective Date by the Agent or with respect
to the making of this assignment directly between themselves.

                                       
<PAGE>

         7. THIS ASSIGNMENT AND ACCEPTANCE IS INTENDED TO TAKE EFFECT AS A
SEALED INSTRUMENT TO BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS
OF THE STATE OF NEW YORK.

         IN WITNESS WHEREOF, intending to be legally bound, each of the
undersigned has caused this Assignment and Acceptance to be executed on its
behalf by its officer thereunto duly authorized, as of the date first above
written.

                                  [NAME OF ASSIGNOR]

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

                                  [NAME OF ASSIGNEE]

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


<PAGE>

SCHEDULE 1

Lenders; Domestic and Eurodollar Lending Offices

BankBoston, N.A.
100 Federal Street
Boston, MA  02110
(Domestic and Eurodollar)

Prudential Securities Credit Corporation
One New York Plaza
New York, New York 10292
(Domestic and Eurodollar)


<PAGE>



SCHEDULE 1.1

Mortgaged Properties


1.   Donnelley Building, 77 West Wacker Drive, Chicago, IL


<PAGE>



SCHEDULE 1.2

Commitments
<TABLE>
<CAPTION>

                                                                   Commitment
Lender                                            Commitment       Percentage
- ------                                            ----------       ----------
<S>                                             <C>               <C>
BankBoston, N.A                                 $112,500,000       50%

Prudential Securities Credit Corporation        $112,500,000       50%

         Total                                  $225,000,000       100%

</TABLE>


<PAGE>

SCHEDULE 1.3

Guarantor Subsidiaries, Related Companies and Permitted Joint Ventures

Guarantor Subsidiaries
- ----------------------

77 West Wacker Limited Partnership
Enterprise Center I, L.P.
Enterprise Center II, L.P.
Enterprise Center III, L.P.
Enterprise Center IV, L.P.
Enterprise Center V, L.P.
Enterprise Center VI, L.P.
Enterprise Center VII, L.P.
Enterprise Center VIII, L.P.
Enterprise Center IX, L.P.
Enterprise Center X, L.P.
Arlington Heights I, L.P.
Arlington Heights II, L.P.
Arlington Heights III, L.P.
East Chicago Enterprise Center Limited Partnership
Hammond Enterprise Center Limited Partnership
Nashville Office Building I, Ltd.
Old Kingston Properties, Ltd.
Professional Plaza, Ltd.
Centre Square II, Ltd.
Triad Parking Company, Ltd.

Related Companies
- -----------------

Prime Group Realty Trust
Prime Group Realty, L.P.
1990 Algonquin Road, L.L.C.
2010 Algonquin Road, L.L.C.
555 Huehl Road, L.L.C.
1669 Wodfiled Road, L.L.C.
475 Superior Avenue, L.L.C. Enterprise Drive, L.L.C.
Enterprise Drive, L.L.C.
280 Shuman Blvd., L.L.C.
77 West Wacker Limited Partnership
Enterprise Center I, L.P.
Enterprise Center II, L.P.
Enterprise Center III, L.P.
Enterprise Center IV, L.P.
Enterprise Center V, L.P.
Enterprise Center VI, L.P.

<PAGE>

SCHEDULE 1.3 (continued)

Enterprise Center VII, L.P.
Enterprise Center VIII, L.P.
Enterprise Center IX, L.P.
Enterprise Center X, L.P.
Arlington Heights I, L.P.
Arlington Heights II, L.P.
Arlington Heights III, L.P.
East Chicago Enterprise Center Limited Partnership
Hammond Enterprise Center Limited Partnership
Nashville Office Building I, Ltd.
Old Kingston Properties, Ltd.
Professional Plaza, Ltd.
Centre Square II, Ltd.
Triad Parking Company, Ltd.
77 Fitness Center Limited Partnership
Libertyville Tech Way, L.L.C.
3818 Grandville, L.L.C.
306 Era Drive, L.L.C.
1301 Ridgeview Drive, L.L.C.
515 Heuhl Road, L.L.C.
455 Academy Drive, L.L.C.
801 Technology Way, L.L.C.
Prime Columbus Industrial, L.L.C.
Kemper/Prime Industrial Partner
1051 N. Kirk Road, L.L.C.
4211 Madison Street, L.L.C.
200 E. Fullerton L.L.C.
350 Randy Road, L.L.C.
4300 Madison Street, L.L.C.
370 Carol Lane, L.L.C.
388 Carol Lane, L.L.C.
941 Weigel Drive, L.L.C.
342 Carol Lane, L.L.C.
343 Carol Lane, L.L.C.
371 N. Gary Avenue,  L.L.C.
350 N. Mannheim Road, L.L.C.
1600 167th Street, L.L.C.
1301 E. Tower Road, L.L.C.
4343 Commerce Court, L.L.C.
11039 Gage Avenue, L.L.C.
11045 Gage Avenue, L.L.C.
1401 S. Jefferson, L.L.C.
4100 Madison Street, L.L.C.
4160 Madison Street, L.L.C.
550 Kehoe Blvd., L.L.C.

<PAGE>

SCHEDULE 1.3 (continued)


Permitted Joint Ventures

None.

<PAGE>


SCHEDULE 1.4

Initial Letters of Credit

<TABLE>
<CAPTION>

Beneficiary                    IRB Project                           Face Amount
- -----------                    -----------                           -----------
<S>                            <C>                                   <C>       
NBD Bank, N. A                 Enterprise Center I, L.P.             $2,939,726

NBD Bank, N. A                 Enterprise Center II, L.P.            $5,068,493

NBD Bank, N. A                 Enterprise Center III, L.P.           $4,561,644

NBD Bank, N. A                 Enterprise Center IV, L.P.            $2,635,616

NBD Bank, N. A                 Enterprise Center V, L.P.             $5,068,493

NBD Bank, N. A                 Enterprise Center VI, L.P.            $4,967,123

Cole Taylor Bank               Enterprise Center VII, L.P.           $7,298,630

Cole Taylor Bank               Enterprise Center VIII, L.P.          $7,095,890

Cole Taylor Bank               Enterprise Center IX, L.P.            $4,815,068

Cole Taylor Bank               Enterprise Center X, L.P.             $4,358,904

First Tennessee Bank N.A       Nashville Office Building I, Ltd.     $4,915,069

First Tennessee Bank N.A       Old Kingston Properties, Ltd.         $3,583,905

First Tennessee Bank N.A       Professional Plaza, Ltd.              $9,215,754

First Tennessee Bank N.A       Centre Square II, Ltd.                $9,215,754

Credit Suisse First Boston     Tennessee Projects.                   $27,261,554.88

TOTAL    $26,930,482

</TABLE>

<PAGE>



SCHEDULE 5.3 (b)

Required Additional Properties


1.   Hilton Parking Garage, Knoxville, TN

2.   Chicago Enterprise Ctr., Chicago, IL

3.   Arlington Hts. Enterprise Ctr., 425 E. Algonquin Rd., Arlington Heights, IL

4.   East Chicago Enterprise Ctr., East Chicago, IN

5.   Hammond Enterprise Ctr., Hammond, IN

6.   SunTrust Bank Bldg., 201 4th Ave., N., Nashville, TN

7.   The Weston, 4823 Kingston Pike, Knoxville, TN

8.   Centre Square I, 620 Market St., Knoxville, TN

9.   Centre Square II, 625 Gay St., Knoxville, TN


<PAGE>



SCHEDULE 6.3

Title to Properties


R. Dan Culp holds a 0.1% limited partnership interest in Professional Plaza,
Ltd.


<PAGE>



SCHEDULE 6.7

Litigation

                  (a) Karen McIntosh v. The Prime Group, Inc., Pepper 
         Construction Company, 77 West Wacker Limited Partnership, and all 
         unknown owners of 77 West Wacker, Case No. 94 M2 1646, filed on June 
         9, 1994, in the Circuit Court of Cook County, Illinois, Municipal 
         Department - Second District. Plaintiff, an employee of a tenant in 
         the 77 West Wacker Drive Building (the "77 Project"), alleges that 
         she was struck by a board providing protection to the wood paneling 
         in the elevator cab in the 77 Project and, as a result thereof, 
         sustained injuries. Pepper Construction Company ("Pepper") 
         constructed the protective barrier in the elevator cab. The 
         plaintiff alleges that The Prime Group, Inc. ("PGI") and 77 West 
         Wacker Limited Partnership (the "77 Partnership") were negligent in 
         failing to maintain, inspect and repair the elevator cab in a 
         reasonable manner and, that her injuries were proximately caused by 
         such negligence. This matter has been forwarded to the 77 
         Partnership's insurance carrier. The 77 Partnership's insurance 
         carrier has tendered the defense of this action to the insurance 
         carrier for Pepper, which has accepted the tender. It is expected 
         that any and all damages awarded to the plaintiff against the 77 
         Partnership or PGI will be fully covered by insurance.

                  (b) Michael Spiezio v. Schal Associates, Inc., Pepper 
         Construction, The Prime Group, Inc. and Carrera Marble & Mosaics, 
         Case No. 92L15284, filed on December 15, 1992, in the Circuit Court 
         of Cook County, Illinois, County Department, Law Division. Plaintiff 
         alleges that he was an employee of Carrera Marble & Mosaics 
         ("Carrera"), which performed work and/or supplied materials for or 
         in connection with the construction of the 77 Project. The plaintiff 
         alleges that, while working on the 77 Project, the plaintiff 
         sustained injuries, and is seeking damages therefor. The defense of 
         this case is being handled by Carrera's insurance carrier. It is 
         expected that any and all damages awarded to the plaintiff against 
         the 77 Partnership or PGI will be fully covered by insurance.

                  (c) Giuseppe Fricano v. Schal Associate, Inc. and 77 West 
         Wacker Limited Partnership, Case No. 92L14542, filed in the Circuit 
         Court, Cook County, Illinois on November 20, 1992. The plaintiff in 
         this action, alleges that he was an employee of GMI Corporation 
         ("GMI"), a subcontractor retained by Schal to perform work in 
         connection with the construction of the 77 Project, and that he was 
         injured while performing work on the 77 Project. The 77 Partnership 
         has tendered defense of this lawsuit to the 77 Partnership's 
         insurance carrier, which, in turn, tendered defense of the action to 
         Massachusetts Bay Insurance Company ("MBIC"), the insurance carrier 
         of GMI, which has accepted the defense of this lawsuit. The defense 
         of this action is being handled by attorneys retained by MBIC. It is 
         expected that any and all damages awarded to the plaintiff against 
         the 77 Partnership will be fully covered by insurance.

                  (d) Charles O. Dowler v. Schal Associates, Inc., The Prime 
         Group, Inc., Prime Group Realty, Inc. and 77 West Wacker Limited 
         Partnership, Case No. 93L07708, filed on June 25, 1993, in the 
         Circuit Court of Cook County, Illinois, County Department, Law 
         Division. Plaintiff in this action alleges that he was employed by 
         PDM Structural Group

<PAGE>

         ("PDM"), a subcontractor retained by Schal to perform work in 
         connection with the construction of the 77 Project, and that, on or 
         about July 2, 1991, the plaintiff was injured while working on the 
         77 Project. The defense of PGI, Prime Group Realty, Inc. and the 77 
         Partnership in this action was tendered to the insurance carrier for 
         Schal, which, in turn, tendered the defense on behalf of Schal, PGI, 
         Prime Group Realty, Inc. and the 77 Partnership to the insurance 
         carrier for PDM. The insurance carrier for PDM has accepted tender 
         of the defense on behalf of all defendants of this action. The 
         defense of this action is being handled by attorneys retained by 
         PDM's insurance carrier. It is expected that any and all damages 
         awarded to the plaintiff against the 77 Partnership, PGI or Prime 
         Group Realty, Inc. will be fully covered by insurance.

                   (e) Robert Ochoa v. 77 West Wacker Limited Partnership, 
         American National Bank as Trustee under Trust Agreement No. 
         110025-08, The Prime Group, Inc., R.R. Donnelley Building, Schal 
         Construction Company, Pepper Construction, LaSalle Construction, 
         Robert Irsay Company and TOR Construction, Case No. 93L010010, filed 
         on August 17, 1993, in the Circuit Court of Cook County, Illinois, 
         County Department, Law Division. The plaintiff alleges that he was 
         an employee of Great Lakes Plumbing Heating Company ("Great Lakes"), 
         a subcontractor of Schal, and that, on or about May 2, 1992, 
         plaintiff fell off scaffolding while performing work in connection 
         with the construction of the 77 Project and, as a result thereof, 
         sustained injuries. The 77 Partnership has tendered defense of this 
         action on behalf of the 77 Partnership to the 77 Partnership's 
         insurance carrier, which, in turn, tendered defense of this action 
         to the insurance carrier for Schal. The insurance carrier for Schal, 
         in turn, tendered defense of this action to the insurance carrier 
         for Great Lakes, which has accepted such tender. The defense of this 
         action was being handled by attorneys retained by the insurance 
         carrier for Great Lakes. It is expected that any and all damages 
         awarded to the plaintiff against the 77 Partnership will be fully 
         covered by insurance.

                  (f) Michael Schumacher v. Schal Associates, Inc. and The 
         Prime Group, Inc., Case No. 94L08011, filed on June 29, 1994, in the 
         Circuit Court of Cook County, Illinois, County Department, Law 
         Division. The plaintiff alleges that he was an employee of Riggio 
         Caulking, Inc., a subcontractor of Schal, and that he was injured on 
         September 16, 1992 while performing work on or with respect to the 
         77 Project. This matter has been forwarded to the 77 Partnership's 
         insurance carrier, which tendered defense of this action to Schal's 
         insurance carrier. The defense of this action is being handled by 
         attorneys retained by Schal's insurance carrier. The 77 Partnership 
         expects that any and all damages awarded to the plaintiff against 
         the 77 Partnership will be fully covered by insurance.

                  (g) Terrance Sullivan v. The Prime Group, Inc., Schal 
         Associates, Inc. n/k/a Schal Bovis, Inc., 77 West Wacker Limited 
         Partnership, Pitt-Des Moines, Inc. and Tribco Construction Co., Case 
         No. 94L09311, filed on July 27, 1994, in the Circuit Court of Cook 
         County, Illinois, County Department, Law Division. The plaintiff, 
         alleges that he was an employee of Gateway Steel which, in turn, was 
         a subcontractor of Schal, and that, on August 18, 1990, the 
         plaintiff was injured while performing work in connection with the 
         construction of the 77 Project. This matter has been forwarded to 
         the 77 Partnership's insurance carrier, which tendered defense of 
         this action to Schal's insurance carrier. 

<PAGE>

         Schal's insurance carrier subsequently tendered this action to the 
         insurance carrier for Tribco Construction Co. ("Tribco"). The 
         defense of this action is being handled by attorneys retained by 
         Tribco's insurance carrier. It is expected that any and all damages 
         awarded to the plaintiff against the 77 Partnership will be fully 
         covered by insurance.

                  (h) Terrance Sullivan v. The Prime Group, Inc., Schal 
         Associates, Inc. and n/k/a Schal Bovis, Inc., and PDM Structural 
         Group, a division of Pitt-Des Moines, Inc., Case No. 95L00481, filed 
         on January 11, 1995 in the Circuit Court of Cook County, Illinois, 
         County Department, Law Division. The plaintiff alleges that he was 
         an employee of Gateway Erectors, which, in turn, was a subcontractor 
         of Schal, and that, on or about, May 30, 1991, while working at the 
         77 Project, the plaintiff was injured when the plaintiff was 
         required to lift a metal re-enforcing bar at the 77 Project. Defense 
         of this action on behalf of all defendants is being handled by 
         attorneys retained by the insurance carrier for a subcontractor of 
         Schal. It is expected that any and all damages awarded to plaintiff 
         against the 77 Partnership will be fully covered by insurance. This 
         case is in the discovery stage.

                   (i) Roger P. Ward d/b/a Roger Ward & Company v. Bank of 
         Montreal, Kemper Investors Life Insurance Company, 77 West Wacker 
         Limited Partnership, The Prime Group, Inc., The John Buck Company 
         and Keck, Mahin & Cate, Case No. 96CH02007284, filed on July 11, 
         1996, in the Circuit Court of Cook County, Illinois, County 
         Department, Chancery Division. The plaintiff in this action alleges 
         that he provided real estate brokerage services in connection with a 
         sublease between Keck, Mahin & Cate, as sublandlord, and Michael, 
         Best & Friedrich, as subtenant, for space in the 77 Project. 
         Plaintiff claims he is entitled to a commission payment of 
         $117,530.00 for such services, plus interest, fees and costs. The 
         plaintiff seeks foreclosure and other available relief. Motions to 
         Dismiss this action, filed by the defendants, have been granted. The 
         defendants are seeking to recover attorneys' fees and costs. The 
         plaintiff has indicated that he intends to appeal the granting of 
         the Motions to Dismiss. The 77 Partnership and PGI are represented 
         in this matter by Kenneth P. Purcell, Esq. of Winston & Strawn.

                  (j) McQuay Services v. The Prime Group, Inc., Case No. 
         97M1-158877, filed on October 29, 1997, in the Circuit Court of Cook 
         County, Illinois, Municipal Department, First District, Contract. 
         The plaintiff in this action seeks $10,353.01, plus interest, which 
         plaintiff alleges is due for a piece of equipment supplied by 
         plaintiff for the 77 Project. PGI and 77 Partnership claim that the 
         equipment was defective and, therefore, no amount is owed to 
         plaintiff. PGI and 77 Partnership intend to defend this action.

                  (k) Illiana Steel, Inc. Illiana Steel, Inc. ("Illiana"), a 
         tenant in the building owned by Enterprise Center IV, L.P. 
         ("EC4LP"), has not paid all amounts which EC4LP has determined is 
         owed under its lease. Illiana has disputed the calculation of 
         additional rent under the lease and, as a result, has not paid all 
         of the amounts invoiced by EC4LP. In addition, a dispute exists 
         between Illiana and EC4LP over whether EC4LP is responsible for 
         tuckpointing brick on the exterior of the leased premises or for the 
         repairs of certain cranes in the leased premises. The parties 
         currently are negotiating a

<PAGE>

         settlement of the matter.

                  (l) David Van Lul, Kathleen Van Lul and Sean Holloway v. 
         The Prime Group, Inc., Cause No 450049702CT00144, filed on February 
         19, 1997, in the Superior Court of Lake County, Indiana, Civil 
         Division, Room Four. In August, 1995, a trailer on the property 
         owned by EC1LP was blown over by wind, injuring David Van Lul's left 
         arm, wrist and back, injuring Sean Holloway's spine and extremities 
         and causing damage to the car owned by Mr. Holloway. The plaintiffs 
         allege that Prime was negligent and that such negligence caused the 
         incident. The defense in this action is being handled by EC1LP's 
         insurance carrier. It is expected that any damages awarded against 
         PGI in this action will be fully covered by insurance.

                  (m) John Garcia and Norma Garcia v. Brian Moore, The Prime 
         Group, Inc. and Deeann B. Auto Sales, Inc., Cause No. 45D019605CT 
         447, filed on May 6, 1996, in the Lake County Superior Court, Room 
         1, Hammond, Indiana. The plaintiffs in this action allege that, on 
         or about May 16, 1994, John Garcia was involved in an automobile 
         accident with a vehicle driven by Brian Moore, who, at the time, was 
         employed by PGI and worked through PGI's office in Hammond, Indiana. 
         PGI has tendered the defense of this action to its insurance 
         carrier. It is expected that all damages awarded to plaintiffs 
         against PGI in this action will be fully covered by insurance.

                  (n) Carol Riepe, Special Administratrix of the estate of 
         Frank J. Riepe, deceased v. Sterling Steel Services, Ltd., Sterling 
         Steel, Inc., The Prime Group, Inc. and Whiting Corporation, Case No. 
         96L02402, filed on March 1, 1996, in the Circuit Court of Cook 
         County, Illinois County Department, Law Division. The plaintiff in 
         this action seeks damages allegedly suffered by the plaintiff by 
         reason of the death of Frank J. Riepe. Mr. Riepe was an employee of 
         Whiting Corporation ("Whiting"). Whiting was retained by Enterprise 
         Center X, L.P. ("EC10LP") to perform certain work in the space 
         leased by Sterling. While working in the space leased by Sterling, 
         Mr. Riepe fell off scaffolding and died. It is expected that any 
         damages awarded in this action to plaintiff against PGI or EC10LP 
         will be fully covered by insurance. The defense of this action on 
         behalf of PGI and EC10LP is being handled by attorneys retained by 
         EC10LP's insurance carrier.

                   (o) Wojciech Chryczyk and Boguska Chryczyk v. The Prime 
         Group, Inc., Arlington Heights I, L.P., Arlington Heights II, L.P., 
         Arlington Heights III, L.P., International Components Corporation, 
         Lech Construction Company and Belcore Electric Construction Co., 
         Case No. 96-L-009297, filed on August 13, 1996, in the Circuit Court 
         of Cook County, Illinois, County Department, Law Division. This 
         action was brought by the plaintiffs to recover damages suffered on 
         account of an incident which occurred on or about April 28, 1995, in 
         the facility owned by Arlington Heights I, L.P. ("AH1LP"), Arlington 
         Height II, L.P. ("AH2LP") and Arlington Heights III, L.P. ("AH3LP"; 
         collectively the "AH Partnerships"). On or about such date, Wojciech 
         Chryczyk, an electrician working in the facility owned by the AH 
         Partnerships, was severely burned as a result of an electrical 
         explosion which occurred from an electrical panel in the facility. 
         Mr. Chryczyk sustained burns over more than sixty percent of his 
         body and, thus far, has incurred more than $780,000.00 in medical 
         expenses. Mr. Chryczyk was employed by

<PAGE>

         Sigma Electric Company, a subcontractor of Lech Construction 
         Company, which was retained by International Components Corporation 
         ("ICC"), a tenant in the facility, to perform certain tenant 
         build-out work for ICC. This action is in the discovery stage. PGI 
         and the AH Partnerships are represented in this action by attorneys 
         retained by the insurance carrier for PGI and the AH Partnerships. 
         It is expected that any damages awarded to plaintiffs against Prime 
         and the AH Partnership will by fully covered by insurance.

<PAGE>



SCHEDULE 6.18

Environmental Reports

Phase I Environmental Assessment of Carlson Environmental, Inc. dated August 
20, 1997 with respect to 77 West Wacker Drive, Chicago, Illinois

Letter from Carlson Environmental, Inc. dated November 11, 1997 to Jennifer 
Nijman of Winston & Strawn and Juliette Browne of Verrill & Dana concerning 
potential off-site issues with respect to 77 West Wacker Drive, Chicago, 
Illinois

<PAGE>



SCHEDULE 6.22(d)

Engineering Reports

Engineer Evaluation of 77 West Wacker Drive
Chicago, Illinois dated November 10, 1997 by
Wiss, Janney, Elstner Associates, Inc.
120 N. LaSalle Street, Suite 2000
Chicago, Illinois  60602


<PAGE>



SCHEDULE 6.22(l)

Rent Rolls
<PAGE>

                        FIRST AMENDMENT TO CREDIT AGREEMENT
                                          
     This First Amendment to Credit Agreement is made as of the 15th day of
December, 1997 (the "First Amendment Effective Date"), by and among PRIME GROUP
REALTY, L.P., a Delaware limited partnership (the "Borrower"), PRIME GROUP
REALTY TRUST, a Maryland trust (the "Company") and BANKBOSTON, N.A. a national
banking association ("BankBoston"), PRUDENTIAL SECURITIES CREDIT CORPORATION, a
Delaware corporation ("Prudential"), the other lending institutions which are
from time to time listed on Schedule 1, (collectively, with BankBoston and
Prudential, the "Lenders") and BANKBOSTON, N.A., as agent for itself and such
other lending institutions (the "Agent").

     WHEREAS, the parties hereto are parties to the certain Credit Agreement
dated as of November 17, 1997 (the "Existing Agreement"); and

     WHEREAS, the parties have agreed to amend the Existing Agreement to provide
for an increase in the Total Commitment from $225,000,000 to $235,000,000 and in
certain other respects.

     NOW, THEREFORE, the parties hereby agree that effective upon the date
hereof the Existing Agreement is amended as follows:

     1.   INCREASE IN TOTAL COMMITMENT.  BankBoston hereby increases its
Commitment to the amount shown on the revised Schedule 1.2 attached hereto.  The
Borrower shall execute and deliver to BankBoston a Note (the "Additional Note")
in an amount equal to the difference between BankBoston's Commitment as shown on
said revised Schedule 1.2 and the Note dated November 17, 1997 delivered to
BankBoston at the time it became a party to the Credit Agreement.  The second
sentence of Section 2.3 is amended to read as follows:  "One or more Notes shall
be payable to the order of each Lender and the aggregate principal amount of the
Notes held by each Lender shall be equal to such Lender's Commitment."

     2.   DEFINITIONS: Section 1.1 of the Existing Agreement is amended to
provide that the following terms shall have the following meanings and, to the
extent that any of the following terms are already defined in the Existing
Agreement, such definitions shall be deemed to be amended and restated by the
following definitions:

     Additional Properties.  Real Estate Assets which hereafter become Mortgaged
Properties or Assigned Mortgage Properties pursuant to Section 5.3.

     Applicable Margin.  As of any date of determination:

     (i)  1.20%, if Total Liabilities are less than 30% of Total Adjusted
Assets, or

                                          1
<PAGE>

     (ii) 1.35%, if Total Liabilities are equal to or less than 45% of Total
Adjusted Assets but the condition set forth in CLAUSE (i) of this definition is
not satisfied,

     (iii)     1.50% if Total Liabilities exceed 45% of Total Adjusted Assets.

Any change in the Applicable Margin caused by a change in ratio of Total
Liabilities to Total Adjusted Assets shall become effective on the 46th day
following the end of the fiscal quarter at which such ratio was computed as
shown on a Compliance Certificate which reflects such change in said ratio above
or below the 30% level or the 45% level.  Notwithstanding anything to the
contrary in this definition for so long as the Continental Towers Property is an
Assigned Mortgaged Property, the Applicable Margin will be increased to 1.75%
during the period from December 15, 1997 through February 14, 1998 and will be
thereafter further increased to 2.00%.

     Appraised Value.  The market value of each of the Mortgaged Properties,
determined by the Requisite Lenders based upon the most recent Appraisals
obtained pursuant to Section 5.4(b), Section 7.12 or Section 10.14.  In
determining Appraised Value the Requisite Lenders shall exclude any value
associated with any unimproved land or unoccupied Buildings located on the
applicable Mortgaged Property.

     Assigned Mortgaged Properties.  The Real Estate Assets designated as such
on Schedule 1.1, the Buildings thereon and all other property described in the
Security Deeds relating thereto and any other Real Estate Assets, Buildings
thereon and other property described in the Security Deeds assigned to the Agent
pursuant to Section 5.3(c).

     Assigned Notes.  The Promissory Notes secured by the Security Deeds on the
Assigned Mortgaged Properties acquired by the Borrower and assigned to the
Agent.

     Assigned Note Assignments.  The Assignments of Liens and Documents from
Borrower to the Agent pursuant to which the Assigned Notes and all related loan
documents and Security Documents are assigned to the Agent.

     Borrowing Base Value.  With respect to each Mortgaged Property, an amount
equal to (i) two times the Net Operating Income for the most recently completed
two fiscal quarters, minus the Reserve Amount for such Mortgaged Property,
divided by (ii) a capitalization rate equal to 0.09 for the West Wacker Drive
Property or 0.10 for any other Mortgaged Property, provided however that with
respect to each Assigned Mortgaged Property, the Net Operating Income for
purposes of this definition shall be the lesser of its Net Operating Income
computed pursuant to the definition thereof or the actual amount of interest
paid (but not prepaid) on the applicable Assigned Note during such period.

     Collateral Value.  With respect to each Mortgaged Property an amount equal
to the lesser of is Appraised Value or its Borrowing Base Value, provided that
the Collateral Value of an Assigned Mortgaged Property shall not exceed the
lesser of (i) the Borrower's net acquisition cost for the Assigned Note and
related documents or (ii) the 

                                          2

<PAGE>

outstanding principal amount of the applicable Assigned Note and provided that
effective on March 15, 1998 the Collateral Value of the Continental Towers
Property shall become zero.

     Continental Towers Property.  The Assigned Mortgaged Property known as
Continental Towers located at or near Golf Road, Rolling Meadows, Illinois.

     Mortgaged Properties.  The (a) Real Estate Assets described on Schedule 1.1
hereto and such other Real Estate Assets which may be subsequently conveyed to
the Agent as Additional Properties to secure the Obligations in accordance with
Section 5.3 hereof, excluding from the foregoing any Real Estate Assets which
the Agent may release pursuant to Section 5.5 hereof, as such Real Estate Assets
are more particularly described in the Security Deeds; (b) the Buildings and
Building Service Equipment located thereon and (to the extent assignable) all
Permits relating thereto; and (c) all other property incident to any of same
described in any Security Document or other Loan Document.  The term Mortgaged
Properties also includes the Assigned Mortgaged Properties.

     Real Estate Assets.  Those fixed and tangible properties consisting of
land, buildings and/or other improvements owned by the Borrower, by any
Guarantor, by any of the Related Companies or by any Permitted Joint Venture at
the relevant time of reference thereto, including without limitation, the
Mortgaged Properties, but excluding all leaseholds other than leaseholds under
ground leases having an unexpired term of at least 30 years.  The term Real
Estate Assets also includes the properties subject to the Security Deeds
relating to the Assigned Mortgaged Properties.

     Security Deeds.  The mortgages and deeds of trust from the Mortgagor to the
Agent pursuant to which the Mortgagor shall convey the Mortgaged Properties as
security for the Obligations and the mortgages which secure the Assigned Notes
and which are assigned to the Agent pursuant to the Assigned Note Assignments.

     Security Documents.  The Security Deeds, the Assignments of Leases and
Rents, the Pledge Agreements and the UCC-1 financing statements, the Assigned
Note Assignments and all documents securing the Assigned Notes assigned thereby.

     Total Adjusted Assets.  The sum of (i) the assets classified as cash or
cash equivalents on the consolidated balance sheet of Borrower prepared in
accordance with Generally Accepted Accounting Principles as of the end of the
most recent fiscal quarter (including any restricted cash other than tenant
deposits), plus (ii) the product of (a) EBITDA for the most recent two fiscal
quarters, times (b) two, divided by (c) 0.0975.  EBITDA used to compute Total
Adjusted Assets will be computed on a pro forma basis as though the assets
reflected on the consolidated balance sheet of Borrower prepared in accordance
with Generally Accepted Accounting Principles as of the end of the most recent
fiscal quarter had been owned since the first day of the applicable period of
two fiscal quarters and as though all assets disposed of prior to the date of
such balance sheet had been disposed of prior to the first day of the applicable
period of two fiscal quarters

                                          3
<PAGE>

     3.   AMENDMENT TO SECTION 5.3. Section 5.3 is hereby amended and restated
to read as follows:

     Section 5.3.   Additional Properties.

          (a)  A Real Estate Asset owned by the Borrower or by a Guarantor may
become an additional Mortgaged Property if (i) the Requisite Lenders, in their
sole discretion, approve such Real Estate as being eligible to become a
Mortgaged Property and (ii) all of the conditions set forth in Section 5.4 are
satisfied with respect to such Real Estate Asset.  Borrower shall provide the
Agent with a notice of each proposed Additional Property describing such
property, its estimated value and its estimated net operating income together
with a current rent roll and the most current operating statements available
with respect thereto.  If the Agent determines that additional information is
needed to sufficiently describe such property, it may request a supplemental
notice from the Borrower containing such additional information.  When such
notice is satisfactory to the Agent, it shall send a copy to each Lender and any
Lender which fails to notify the Agent of its objection within five (5) Business
Days after its receipt of such notice shall be deemed to have granted its
approval of the eligibility of such Real Estate Asset to become an Additional
Property.  In the event that the Requisite Lenders grant such approval and all
of the conditions set forth in Section 5.4 are satisfied, the Agent shall notify
the Borrower and within ten (10) days thereafter the Borrower and the Company
shall execute and deliver an Indemnity Agreement and the Mortgagor shall execute
and deliver to the Agent a Security Deed, an Assignment of Rents and Leases and
UCC-1 financing statements, which Security Documents shall be in substantially
the form of the Security Documents executed and delivered herewith with such
changes as the Agent may deem desirable to address the laws of the State where
the Additional Property is located or the factual circumstances of the
Additional Property.  Such Additional Properties shall be deemed to be Mortgaged
Properties upon the recording and filing of such Security Documents and the
Agent's receipt of satisfactory evidence thereof.

          (b) After the Continental Towers Property has been released as an
Assigned Mortgaged Property pursuant to Section 5.5, another Real Estate Asset
may become an Assigned Mortgaged Property if (i) the Requisite Lenders, in their
sole discretion, approve such Real Estate Asset as being eligible to become an
Assigned Mortgaged Property, (ii) the Requisite Lenders, in their sole
discretion, approve the terms and conditions of the proposed Assigned Note and
related documents and (iii) all conditions set forth in Section 5.4 are
satisfied with respect to such Real Estate Asset.  If the Requisite Lenders
grant such approvals, then upon satisfaction of the conditions set forth in
Section 5.4 and execution and delivery of the Assigned Note Assignment, the
original of the Assigned Note endorsed to the Agent and all other documents
required by the Agent in connection therewith, the Agent shall revise Schedule
1.1 to include such Additional Property as an Assigned Mortgaged Property.  At
any time there shall be no more than one Assigned Mortgaged Property hereunder.

                                          4
<PAGE>

          (c)  The Agent and the Lead Lenders shall use their best efforts to
complete their review of the documents submitted with respect to each Additional
Property and notify the Borrower as to whether the conditions in Section 5.4 are
satisfied with ten (10) Business Days after receipt of the last of the items
required pursuant to Section 5.4.

     4.   AMENDMENT TO SECTION 5.5. Section 5.5 is hereby amended and restated
to read as follows:

     Section 5.5.  Release of Mortgaged Properties.  The Borrower may request
that the Agent release any Mortgaged Property from the lien of the Security
Documents and the Agent shall grant such requested release provided that (i) the
requested release is consented to by the Requisite Lenders and (ii) there is
then no continuing Default or Event of Default under this Agreement and the
requested release will not result in any Default or Event of Default under this
Agreement and the Borrower delivers to the Agent a pro-forma Compliance
Certificate reasonably satisfactory to the Agent demonstrating that the
requested release will not result in a violation of any of the covenants in
Section 9.  Each Lender agrees to respond to any such request for Requisite
Lender consent within five (5) business days and agrees to not unreasonably
withhold its consent.  The Borrower may request releases of a portion of a
Mortgaged Property consisting of undeveloped land to be developed by Borrower or
sold provided that in addition to the requirements set forth above, the Borrower
shall also submit such additional information as may be reasonably requested by
the Agent including, without limitation, (i) an updated survey and endorsements
to the Title Policy; (ii) an updated Appraisal of the remaining portion of the
Mortgaged Property and (iii) evidence that the division of the Mortgaged
Property pursuant to the requested release will not result in violation of any
zoning ordinance or other applicable laws and ordinances.  If the Borrower shall
request the release of any Mortgaged Property which is adjacent to any other
Mortgaged Property which is not to be simultaneously released, the Agent may
require the establishment of appropriate easements and maintenance agreements
satisfactory to the Agent relating to any shared utilities, drainage facilities,
access drives or walks, parking areas or other shared facilities.

     5.   AMENDMENT TO SECTION 8.3 (E).  Section 8.3 (e) is hereby amended and
restated to read as follows:

          (e)  Investments made in the ordinary course of the Borrower's
business, in (i) any mortgages the acquisition of which is expressly approved by
the Requisite Lenders, (ii) mortgages and notes receivable having an aggregate
principal amount, exclusive of any investments in mortgages which may have been
so expressly approved by the Requisite Lenders of not more than $25,000,000,
(iii) Permitted Joint Ventures (to the extent permitted by Section 8.4(a)), or
(iv) Interest Rate Contracts;

     6.   AMENDMENT TO SECTION 9.1. Section 9.1 is hereby amended and restated
to read as follows:

                                          5
<PAGE>

     Section 9.1.   Collateral Value.  The Borrower will not at any time permit
the Outstanding Principal Amount to exceed the sum of (i) sixty percent (60%) of
the total of the Collateral Values of the Mortgaged Properties other than the
Assigned Mortgaged Properties plus (ii) fifty percent (50%) of the total of the
Collateral Values of the Assigned Mortgaged Properties.

     7.   UPDATED SCHEDULES TO CREDIT AGREEMENT.  The following Schedules to the
Credit Agreement are hereby updated, supplemented or replaced as follows:

          (a)  Schedule 1.1 is replaced by Schedule 1.1 attached hereto.

          (b)  Schedule 1.2 is replaced by Schedule 1.2 attached hereto.

          (c)  Schedule 1.3 is replaced by Schedule 1.3 attached hereto.

          (d)  Schedule 1.4 is replaced by Schedule 1.4 attached hereto.
     
          (e)  Schedule 5.3(b) is hereby deleted.

          (f)  Schedule 6.18 is replaced by Schedule 6.18 attached hereto.

          (g)  Schedule 6.22(d) is replaced by Schedule 6.22(d) attached hereto.

          (h)  Schedule 6.22(l) is supplemented by adding thereto the rent rolls
               each of the Additional Properties which have been added to
               Schedule 1.1 since the Effective Date of the Existing Agreement.

     8.   APPROVAL OF INVESTMENTS IN MORTGAGES.  Pursuant to Section 8.3(e)(ii)
of the Credit Agreement the Requisite Lenders hereby approve the Borrower's
Investments in the notes receivable and mortgages relating to the Continental
Towers Property and relating to the property at 180 North LaSalle Street,
Chicago, Illinois.

     9.   REPRESENTATIONS AND WARRANTIES.  The Borrower and the Company
represent and warrant that each of the representations and warranties contained
in Section 6 is true, correct and complete in all material respects as of the
date hereof to the same extent as though made on such date and that no Default
or Event of Default has occurred and is continuing on the date hereof.  The term
Mortgaged Properties as used in said representations and warranties includes the
Properties listed on Schedule 1.1 attached hereto.

     10.  EFFECTIVENESS OF LOAN DOCUMENTS.  On the First Amendment Effective
Date each Guaranty and each Security Deed shall be amended to reflect the
increase of the Total Commitment and the execution and delivery of the
Additional Notes.  All references in the Existing Agreement to said Loan
Documents shall mean and be in reference to said Loan Documents as so amended. 
The Borrower hereby confirms that each of the Security 

                                          6
<PAGE>

Documents shall continue to secure the payment and performance of all of the
Obligations under the Existing Agreement as amended hereby and the Borrower's
obligations under the Security Documents shall continue to be valid and
enforceable and shall not be impaired or limited by the execution or
effectiveness of this Amendment.  Every reference contained in the Loan
Documents to the Credit Agreement shall mean and be a reference to the Existing
Agreement as amended hereby and as the Credit Agreement may be further amended. 
Every reference contained in the Loan Documents to the Notes shall be deemed to
include the Additional Notes.  Except as specifically amended by this Amendment,
the Existing Agreement and each of the Loan Documents shall remain in full force
and effect and are hereby ratified and confirmed.

     11.  MISCELLANEOUS.  This Amendment shall be governed by, interpreted and
construed in accordance with all of the same provisions applicable under the
Existing Agreement including, without limitation, all definitions set forth in
Section 1.1, the rules of interpretation set forth in Section 1.2, the
provisions relating to governing law set forth in Section 20, the provisions
relating to counterparts in Section 22 and the provision relating to
severability in Section 26.

                                          7
<PAGE>

     IN WITNESS WHEREOF, the undersigned have duly executed this Agreement as a
sealed instrument as of the date first set forth above.

WITNESS:                                BANKBOSTON, N.A.


                                        By:  /s/ Lori Y. Litow
- ------------------------------             -------------------------------
                                             LORI Y. LITOW
                                             Its:VICE PRESIDENT

                                        PRUDENTIAL SECURITIES CREDIT
                                        CORPORATION

/s/  Fred Robustelli                    By:  /s/ George D. Morgan
- ------------------------------             -------------------------------
                                             GEORGE D. MORGAN, III
                                             Its:VICE PRESIDENT

                                        PRIME GROUP REALTY TRUST

                                        By:  /s/  W. Michael Karnes
- ------------------------------             -------------------------------
                                             W. MICHAEL KARNES
                                             Its:EXECUTIVE VICE PRESIDENT

                                        PRIME GROUP REALTY, L.P.
                                        By:  PRIME GROUP REALTY TRUST,
                                                its managing general partner

                                        By:  /s/  W. Michael Karnes
- ------------------------------             -------------------------------
                                             W. MICHAEL KARNES
                                             Its:EXECUTIVE VICE PRESIDENT

                                          8


<PAGE>
                               EXHIBIT 10.30

                         REGISTRATION RIGHTS AGREEMENT

     REGISTRATION RIGHTS AGREEMENT, dated as of November    , 1997 (this 
"Agreement"), by and between Prime Group Realty Trust, a Maryland real estate 
investment trust (the "Company"), and Security Capital Preferred Growth 
Incorporated, a Maryland corporation (the "Investor").

     WHEREAS, pursuant to that certain Series A Preferred Securities Purchase 
Agreement, dated as of November 11, 1997 (the "Purchase Agreement"), by and 
among the Company, Prime Group Realty, L.P., a Delaware limited partnership, 
and the Investor, the Investor has agreed to acquire 2 million shares of 
Series A Cumulative Convertible Preferred Shares of Beneficial Interest, par 
value $.01 per share, of the Company (the "Preferred Shares"), all of which 
may be converted into the Company's common shares of beneficial interest, par 
value S.01 per share (the "Common Shares"), pursuant to the terms of the 
Preferred Shares; and

     WHEREAS, in connection with the Purchase Agreement, the Company has 
agreed to register for sale by the Investor and certain transferees, the 
Preferred Shares and Common Shares received by the Investor upon conversion 
of Preferred Shares (collectively, the "Registrable Shares"); and

     WHEREAS, the parties hereto desire to enter into this Agreement to 
evidence the foregoing agreement of the Company and the mutual covenants of 
the parties relating thereto.

     NOW, THEREFORE, in consideration of the foregoing and the covenants of 
the parties set forth herein and for other good and valuable consideration, 
the receipt and sufficiency of which are hereby acknowledged, subject to the 
terms and conditions set forth herein, the parties hereby agree as follows:

     Section (i)    Certain Definitions.  In this Agreement the following 
terms shall have the following respective meanings:

     "Accredited Investor" shall have the meaning set forth in Rule 501 of 
the General Rules and Regulations promulgated under the Securities Act.

     "Affiliate" shall mean, when used with respect to a specified Person, 
another Person that directly, or indirectly through one or more 
intermediaries, controls or is controlled by or is under common control with 
the Person specified.

     "Commission" shall mean the Securities and Exchange Commission or any 
other federal agency at the time administering the Securities Act.

     "Exchange Act" shall mean the Securities Exchange Act of 1934, as 
amended, and the rules and regulations of the Commission thereunder, all as 
the same shall be in effect at the 

<PAGE>



relevant time.

     "Holders" shall mean (i) the Investor and (ii) each Person holding 
Registrable Shares (which term, for purposes of this definition shall include 
Common Shares that may be issued upon conversion of outstanding Preferred 
Shares) as a result of a transfer or assignment to that Person of Registrable 
Shares other than pursuant to an effective registration statement or Rule 144 
under the Securities Act.

     "Indemnified Party" shall have the meaning ascribed to it in Section 
6(c) of this Agreement.

     "Indemnifying Party" shall have the meaning ascribed to it in Section 
6(c) of this Agreement.

     "Person" shall mean an individual, corporation, partnership, estate, 
trust, association, private foundation, joint stock company or other entity.

     "Piggyback Notice" shall have the meaning ascribed to it in Section 3(a) 
of this Agreement.

     "Piggyback Registration" shall have the meaning ascribed to it in 
Section 3(a) of this Agreement.

     "Preferred Shares" shall have the meaning ascribed to it in the recitals 
to this Agreement.

     The terms "Register," "Registered" and "Registration" refer to a 
registration effected by preparing and filing a registration statement in 
compliance with the Securities Act providing for the sale by the Holders of 
Registrable Shares in accordance with the method or methods of distribution 
designated by the Holders, and the declaration or ordering of the 
effectiveness of such registration statement by the Commission.

     "Registrable Shares" shall have the meaning ascribed to it in the 
recitals to this Agreement, except that as to any particular Registrable 
Shares, once issued such securities shall cease to be Registrable Shares when 
(a) a registration statement with respect to the sale of such securities 
(other than the Company's registration statement on Form S-11 (File No. 
333-33547)) shall have become effective under the Securities Act and such 
securities shall have been disposed of in accordance with such registration 
statement, or (b) such securities shall have been sold in accordance with 
Rule 144 (or any successor provision) under the Securities Act.

     "Registration Expenses" shall mean all out-of-pocket expenses (excluding 
Selling Expenses) incurred by the Company in complying with Sections 2, 3 and 
4 hereof, including, without limitation, the following: (a) all registration, 
filing and listing fees; (b) fees and expenses 


                                        2

<PAGE>

of compliance with federal and state securities or real estate syndication 
laws (including, without limitation, reasonable fees and disbursements of 
counsel in connection with state securities and real estate syndication 
qualifications of the Registrable Shares under the laws of such jurisdictions 
as the Holders may reasonably designate); (c) printing (including, without 
limitation, expenses of printing or engraving certificates for the 
Registrable Shares in a form eligible for deposit with The Depository Trust 
Company and otherwise meeting the requirements of any securities exchange on 
which they are listed and of printing registration statements and 
prospectuses), messenger, telephone, shipping and delivery expenses; (d) fees 
and disbursements of counsel for the Company; (e) fees and disbursements of 
all independent public accountants of the Company (including without 
limitation the expenses of any annual or special audit and "cold comfort" 
letters required by the managing underwriter); (f) Securities Act liability 
insurance if the Company so desires; (g) fees and expenses of other Persons 
reasonably necessary in connection with the registration, including any 
experts, retained by the Company; (h) fees and expenses incurred in 
connection with the listing of the Registrable Shares on each securities 
exchange on which securities of the same class or series are then listed; and 
(i) fees and expenses associated with any filing with the National 
Association of Securities Dealers, Inc. required to be made in connection 
with the registration statement.

     "Registration Request" shall have the meaning ascribed to it in Section 
2(a) of this Agreement.

     "Rule 144" shall mean Rule 144 promulgated by the Commission under the 
Securities Act. 

     "Securities Act" shall mean the Securities Act of 1933, as amended, and 
the rules and regulations of the Commission thereunder, all as the same shall 
be in effect at the relevant time.

     "Selling Expenses" shall mean all underwriting discounts, selling 
commissions and stock transfer taxes applicable to any sale of Registrable 
Shares.

     Section (ii)   Demand Registration.

     (a)  Upon receipt of a written request (a "Registration Request") 
delivered not earlier than 120 days prior to the first anniversary of this 
Agreement from Holders holding at least 50% of the aggregate of the number of 
Preferred Shares then outstanding, the Company shall (i) promptly give notice 
of the Registration Request to all non-requesting Holders and (ii) prepare 
and file with the Commission, within 45 days after its receipt of such 
Registration Request a registration statement for the purpose of effecting a 
Registration of the sale of all Registrable Shares by the requesting Holders 
and any other Holder who requests to have his Registrable Shares included in 
such registration statement within IO days after receipt of notice by such 
Holder of the Registration Request.  The Company shall use its reasonable 
best efforts to effect such Registration as soon as practicable but not later 
than 120 days after its receipt of such Registration Request (including, 
without limitation, the execution of an undertaking to file post-effective 
amendments and appropriate qualification under applicable state securities 
and real estate 


                                        3

<PAGE>

syndication laws); and shall keep such Registration continuously effective 
until the earlier of (i) the third anniversary of the date hereof, (h) the 
date on which all Registrable Shares have been sold pursuant to such 
registration statement or Rule 144, and (iii) the date on which, in the 
reasonable opinion of counsel to the Holders, all of the Registrable Shares 
may be sold in accordance with Rule 144(k); provided, however, that the 
Company shall not be obligated to take any action to effect any such 
Registration, qualification or compliance pursuant to this Section 2 in any 
particular jurisdiction in which the Company would be required to execute a 
general consent to service of process in effecting such Registration, 
qualification or compliance unless the Company is already subject to service 
in such jurisdiction.

     Notwithstanding the foregoing, the Company shall have the right (the 
"Suspension Right") to defer such filing (or suspend sales under any filed 
registration statement or defer the updating of any filed registration 
statement and suspend sales thereunder) for a period of not more than 90 days 
during any one-year period ending on December 31, if the Company shall 
furnish to the Holders a certificate signed by an executive officer or any 
trustee of the Company stating that, in the good faith judgment of the 
Company, it would be detrimental to the Company and its shareholders to file 
such registration statement or amendment thereto at such time (or continue 
sales under a filed registration statement) and therefore the Company has 
elected to defer the filing of such registration statement (or suspend sales 
under a filed registration statement).

     (b)  The Company shall not be required to effect more than one (1) 
Registration pursuant to this Section 2.

     Section (i)    Piggyback Registrations.

     (c)  On and after the Conversion Date (as defined in the Company's 
Amended and Restated Declaration of Trust), so long as the Investor and its 
Affiliates hold at least 25% of the Registrable Shares, if the Company 
proposes to register any of its common equity securities or any securities 
convertible into its common equity securities under the Securities Act (other 
than pursuant to (i) a registration statement filed pursuant to Rule 415 
under the Securities Act, (ii) a registration on Form S-4 or any successor 
form, or (iii) an offering of securities in connection with an employee 
benefit, share dividend, share ownership or dividend reinvestment plan) and 
the registration form to be used may be used for the registration of 
Registrable Shares, the Company will give prompt written notice to all 
holders of Registrable Shares of its intention to effect such a registration 
(each a "Piggyback Notice") and, subject to subparagraph 3(c) below, the 
Company will include in such registration all Registrable Shares with respect 
to which the Company has received written requests for inclusion therein 
within ten days after the date of sending the Piggyback Notice (a "Piggyback 
Registration"), unless, if the Piggyback Registration is not an underwritten 
offering, the Company in its reasonable judgement determines that, or in the 
case of an underwritten Piggyback Registration, the managing underwriters 
advise the Company in writing that in their opinion, the inclusion of 
Registrable Shares would adversely interfere with such offering, affect the 
Company's securities in the public markets, or otherwise adversely affect the 
Company.  Nothing herein shall affect the right of the Company to withdraw 
any such 

                                        4

<PAGE>

registration in its sole discretion.

     (d)  If a Piggyback Registration is a primary registration on behalf of 
the Company and, if the Piggyback Registration is not an underwritten 
offering, the Company in its reasonable judgement determines that, or in the 
case of an underwritten Piggyback Registration, the managing underwriters 
advise the Company in writing that in their opinion, the number of securities 
requested to be included in such registration exceeds the number which can be 
sold in an orderly manner within a price range acceptable to the Company, the 
Company will include in such registration (i) first, the securities the 
Company proposes to sell and (ii) second, the Registrable Shares requested to 
be included in such Registration and any other securities requested to be 
included in such registration, pro rata among the holders of Registrable 
Shares requesting such registration and the holders of such other securities 
on the basis of the number of Shares requested for inclusion in such 
registration by each such holder.

     (e)  If a Piggyback Registration is a secondary registration on behalf 
of holders of the Company's securities other than the holders of Registrable 
Shares, and, if the Piggyback Registration is not an underwritten offering, 
the Company determines that, or in the case of an underwritten Piggyback 
Registration, the managing underwriters advise the Company in writing that in 
their opinion, the number of securities requested to be included in such 
registration exceeds the number which can be sold in an orderly manner in 
such offering within a price range acceptable to the holders initially 
requesting such registration, the Company will include in such registration 
the securities requested to be included therein by the holders requesting 
such registration and the Registrable Shares requested to be included in such 
registration, pro rata among the holders of securities requesting such 
registration on the basis of the number of Shares requested for inclusion in 
such registration by each such holder.

     (f)  In the case of an underwritten Piggyback Registration, the Company 
will have the right to select the investment banker(s) and manager(s) to 
administer the offering.  If requested by the underwriters for any 
underwritten offerings by Holders, under a registration requested pursuant to 
Section 2(a), the Company will enter into a customary underwriting agreement 
with such underwriters for such offering, to contain such representations and 
warranties by the Company and such other terms which are customarily 
contained in agreements of this type.  The Holders shall be a party to such 
underwriting agreement and may, at their option, require that any or all of 
the conditions precedent to the obligations of such underwriters under such 
underwriting agreement be conditions precedent to the obligations of Holders. 
 The Holders shall not be required to make any representations or warranties 
to or agreement with the Company or the underwriters other than 
representations, warranties or agreements regarding the Holders and the 
Holders' intended method of distribution and any other representation or 
warranties required by law.

     Section (i)    Registration Procedures.

     (g)  The Company shall promptly notify the Holders of the occurrence

                                        5

<PAGE>


of the following events:

          (i)  when any registration statement relating to the Registrable 
Shares or post-effective amendment thereto filed with the Commission has 
become effective;

          (ii) the issuance by the Commission of any stop order suspending 
the effectiveness of any registration statement relating to the Registrable 
Shares;

          (iii)     the suspension of an effective registration statement by 
the Company in accordance with the last paragraph of Section 2(a) hereof;

          (iv) the Company's receipt of any notification of the suspension of 
the qualification of any Registrable Shares covered by a registration 
statement for sale in any jurisdiction; and

          (v)  the existence of any event, fact or circumstance that results 
in a registration statement or prospectus relating to Registrable Shares or 
any document incorporated therein by reference containing an untrue statement 
of material fact or omitting to state a material fact required to be stated 
therein or necessary to make the statements therein not misleading during the 
distribution of securities.

     The Company agrees to use its reasonable best efforts to obtain the 
withdrawal of any order suspending the effectiveness of any such registration 
statement or any state qualification as promptly as possible. The Investor 
agrees by acquisition of the Registrable Shares that upon receipt of any 
notice from the Company of the occurrence of any event of the type described 
in Section 4(a)(ii), (iii), (iv) or (v) to immediately discontinue its 
disposition of Registrable Shares pursuant to any registration statement 
relating to such securities until the Investor's receipt of written notice 
from the Company that such disposition may be made.

     (h)  The Company shall provide to the Holders, at no cost to the 
Holders, a copy of the registration statement and any amendment thereto used 
to effect the Registration of the Registrable Shares, each prospectus 
contained in such registration statement or post-effective amendment and any 
amendment or supplement thereto and such other documents as the requesting 
Holders may reasonably request in order to facilitate the disposition of the 
Registrable Shares covered by such registration statement.  The Company 
consents to the use of each such prospectus and any supplement thereto by the 
Holders in connection with the offering and sale of the Registrable Shares 
covered by such registration statement or any amendment thereto.  The Company 
shall also file a sufficient number of copies of the prospectus and any 
post-effective amendment or supplement thereto with the New York Stock 
Exchange, Inc. (or, if the Common Shares are no longer listed thereon, with 
such other securities exchange or market on which the Common Shares are then 
listed) so as to enable the Holders to have the benefits of the prospectus 
delivery provisions of Rule 153 under the Securities Act.


                                        6

<PAGE>

     (i)  The Company agrees to use its reasonable best efforts to cause the 
Registrable Shares covered by a registration statement to be registered with 
or approved by such state securities authorities as may be necessary to 
enable the Holders to consummate the disposition of such shares pursuant to 
the plan of distribution set forth in the registration statement; provided, 
however, that the Company shall not be obligated to take any action to effect 
any such Registration, qualification or compliance pursuant to this Section 4 
in any particular jurisdiction in which the Company would be required to 
execute a general consent to service of process in effecting such 
Registration, qualification or compliance unless the Company is already 
subject to service in such jurisdiction.

     (j)  Subject to the Company's Suspension Right, if any event, fact or 
circumstance requiring an amendment to a registration statement relating to 
the Registrable Shares or supplement to a prospectus relating to the 
Registrable Shares shall exist, immediately upon becoming aware thereof the 
Company agrees to notify the Holders and prepare and furnish to the Holders a 
post-effective amendment to the registration statement or supplement to the 
prospectus or any document incorporated therein by reference or file any 
other required document so that, as thereafter delivered to the purchasers of 
the Registrable Shares, the prospectus will not contain an untrue statement 
of a material fact or omit to state any material fact required to be stated 
therein or necessary to make the statements therein not misleading.

     (k)  The Company agrees to use its reasonable best efforts (including 
the payment of any listing fees) to obtain the listing of all Registrable 
Shares covered by the registration statement on each securities exchange on 
which securities of the same class or series are then listed.

     (l)  The Company agrees to use its reasonable best efforts to comply 
with the Securities Act and the Exchange Act in connection with the offer and 
sale of Registrable Shares pursuant to a registration statement, and, as soon 
as reasonably practicable following the end of any fiscal year during which a 
registration statement effecting a Registration of the Registrable Shares 
shall have been effective, to make available to its security holders an 
earnings statement satisfying the provisions of Section 11 (a) of the 
Securities Act.

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

     Section (i)    Expenses of Registration.  The Company shall pay all 
Registration Expenses incurred in connection with the registration, 
qualification or compliance pursuant to Sections 2, 3 and 4 hereof.  All 
Selling Expenses incurred in connection with the sale of Registrable Shares 
by any of the Holders shall be borne by the Holder selling such Registrable 
Shares.  Each Holder shall pay the expenses of its own counsel.

                                        7
<PAGE>

     Section (ii)   Indemnification.

     (n)  The Company will indemnify each Holder, each Holder's officers and 
directors, and each person controlling such Holder within the meaning of 
Section 15 of the Securities Act, against all expenses, claims, losses, 
damages and liabilities (including reasonable legal expenses), arising out of 
or based on any untrue statement (or alleged untrue statement) of a material 
fact contained in any registration statement or prospectus relating to the 
Registrable Shares, or any amendment or supplement thereto, or based on any 
omission (or alleged omission) to state therein a material fact required to 
be stated therein or necessary to make the statements therein not misleading, 
provided, however, that the Company will not be liable in any such case to 
the extent that any such claim, loss, damage, liability or expense arises out 
of or is based on any untrue statement or omission or alleged untrue 
statement or omission, made in reliance upon and in conformity with 
information furnished in writing to the Company by such Holder or underwriter 
for inclusion therein.


                                        8
<PAGE>


     (o)  Each Holder will indemnify the Company, each of its trustees and 
each of its officers who sips the registration statement, each underwriter, 
if any, of the Company's securities covered by such registration statement, 
and each person who controls the Company or such underwriter within the 
meaning of Section 15 of the Securities Act, against all claims, losses, 
damages and liabilities (including reasonable legal fees and expenses) 
arising out of or based on any untrue statement (or alleged untrue statement) 
of a material fact contained in any such registration statement or 
prospectus, or any amendment or supplement thereto, or based on any omission 
(or alleged omission) to state therein a material fact required to be stated 
therein or necessary to make the statements therein not misleading, in each 
case to the extent, but only to the extent, that such untrue statement (or 
alleged untrue statement) or omission (or alleged omission) is made in such 
registration statement or prospectus, in reliance upon and in conformity with 
information furnished in writing to the Company by such Holder for inclusion 
therein.

     (p)  Each party entitled to indemnification under this Section 6 (the 
"Indemnified Party") shall give notice to the party required to provide 
indemnification (the "Indemnifying Party") promptly after such Indemnified 
Party has actual knowledge of any claim as to which indemnity may be sought, 
but the omission to so notify the Indemnifying Party shall not relieve it 
from any liability which it may have to the Indemnified Party pursuant to the 
provisions of this Section 6 except to the extent of the actual damages 
suffered by such delay in notification.  The Indemnifying Party shall assume 
the defense of such action, including the employment of counsel to be chosen 
by the Indemnifying Party to be reasonably satisfactory to the Indemnified 
Party, and payment of expenses.  The Indemnified Party shall have the right 
to employ its own counsel in any such case, but the legal fees and expenses 
of such counsel shall be at the expense of the Indemnified Party, unless the 
employment of such counsel shall have been authorized in writing by the 
Indemnifying Party in connection with the defense of such action, or the 
Indemnifying Party shall not have employed counsel to take charge of the 
defense of such action or the Indemnified Party shall have reasonably 
concluded that there may be defenses available to it or them which are 
different from or additional to those available to the Indemnifying Party (in 
which case the Indemnifying Party shall not have the right to direct the 
defense of such action on behalf of the Indemnified Party), in any of which 
events such fees and expenses shall be borne by the Indemnifying Party.  No 
Indemnifying Party, in the defense of any such claim or litigation, shall, 
except with the consent of each Indemnified Party, consent to entry of any 
judgment or enter into any settlement which does not include as an 
unconditional term thereof the giving by the claimant or plaintiff to such 
Indemnified Party of a release from all liability in respect to such claim or 
litigation.

                                        9

<PAGE>

     (q)  If the indemnification provided for in this Section 6 is 
unavailable to a party that would have been an Indemnified Party under this 
Section 6 in respect of any expenses, claims, losses, damages and liabilities 
referred to herein, then each party that would have been an Indemnifying 
Party hereunder shall, in lieu of indemnifying such Indemnified Party, 
contribute to the amount paid or payable by such Indemnified Party as a 
result of such expenses, claims, losses, damages and liabilities in such 
proportion as is appropriate to reflect the relative fault of the 
Indemnifying Party on the one hand and such Indemnified Party on the other in 
connection with the statement or omission which resulted in such expenses, 
claims, losses, damages and liabilities, as well as any other relevant 
equitable considerations.  The relative fault shall be determined by 
reference to, among other things, whether the untrue or alleged untrue 
statement of a material fact or the omission or alleged omission to state a 
material fact relates to information supplied by the Indemnifying Party or 
such Indemnified Party and the parties' relative intent, knowledge, access to 
information and opportunity to correct or prevent such statement or omission. 
 The Company and each Holder agree that it would not be just and equitable if 
contribution pursuant to this Section were determined by pro rata allocation 
or by any other method of allocation which does not take account of the 
equitable considerations referred to above in this Section 6(d).

     (r)  No person guilty of fraudulent misrepresentation (within the 
meaning of Section I I (f) of the Securities Act) shall be entitled to 
contribution from any person who was not guilty of such fraudulent 
misrepresentation.

     (s)  In no event shall any Holder be liable for any expenses, claims, 
losses, damages or liabilities pursuant to this Section 6 in excess of the 
net proceeds to such Holder of any Registrable Shares sold by such Holder.

     Section (i)    Information to be Furnished by  Holders.  Each Holder 
shall furnish to the Company such information as the Company may reasonably 
request and as shall be required in connection with the Registration and 
related proceedings referred to in Section 2 or Section 3 hereof.  If any 
Holder fails to provide the Company with such information within IO days of 
receipt of the Company's request, the Company's obligations under Section 2 
or Section 3 hereof, as applicable, with respect to such Holder or the 
Registrable Shares owned by such Holder shall be suspended until such Holder 
provides such information.

     Section (ii)   Undertaking to Participate in Underwriting.  If the 
Holders of at least $20 million of the Registrable Shares shall propose to 
sell Registrable Shares in an underwritten public offering, the Company shall 
make available members of the management of the Company and its affiliates 
for reasonable assistance in selling efforts relating to such offering, to 
the extent customary for a public offering (including, without limitation, to 
the extent customary, senior management attendance at due diligence meetings 
with the underwriters and their counsel and road shows) and shall enter into 
underwriting agreements containing usual and customary terms and conditions 
reasonably acceptable to the Company for such types of offerings.

     Section (iii)  Rule 144 Sales.

                                       10

<PAGE>


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

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

     Section (i)    Miscellaneous.

     (v)  Governing Law.  This Agreement shall be governed in all respects by 
the laws of the State of Maryland.  

     (w)  Entire Agreement.  This Agreement constitutes the full and entire 
understanding and agreement between the parties with regard to the subject 
matter hereof.

     (x)  Amendment.  No supplement, modification, waiver or termination of 
this Agreement shall be binding unless executed in writing by the party to be 
bound thereby.

     (y)  Notices, etc.  Each notice, demand, request, request for approval, 
consent, approval, disapproval, designation or other communication (each of 
the foregoing being referred to herein as a notice) required or desired to be 
given or made under this Agreement shall be in writing (except as otherwise 
provided in this Agreement), and shall be effective and deemed to have been 
received (i) when delivered in person, (ii) when sent by fax with receipt 
acknowledged, (iii) five (5) days after having been mailed by certified or 
registered United States mail, postage prepaid, return receipt requested, or 
(iv) the next business day after having been sent by a nationally recognized 
overnight mail or courier service, receipt requested.  Notices shall be 
addressed as follows: (a) if to the Investor, at the Investor's address or 
fax number set forth below its signature hereon, or at such other address or 
fax number as the Investor shall have furnished to the Company in writing, or 
(b) if to any assignee or transferee of an Investor, at such address or fax 
number as such assignee or transferee shall have furnished the Company in 
writing, or (c) if to the Company, at the address of its principal executive 
offices and addressed to the attention of the President, or at such other 
address or fax number as the Company shall have furnished to the Investors or 
any assignee or transferee.  Any notice or other communication required to be 
given hereunder to a Holder in connection with a registration may instead be 
given to the designated representative of such Holder.

     (z)  Counterparts.  This Agreement may be executed in any number of 
counterparts, each of which may be executed by fewer than all of the parties 
hereto (provided that each party 


                                       11

<PAGE>

executes one or more counterparts), each of which shall be enforceable 
against the parties actually executing such counterparts, and all of which 
together shall constitute one instrument.

     (aa) Severability.  In the event that any provision of this Agreement 
becomes or is declared by a court of competent jurisdiction to be illegal, 
unenforceable or void, this Agreement shall continue in full force and effect 
without said provision.

     (bb) Section Titles.  Section titles are for descriptive purposes only 
and shall not control or alter the meaning of this Agreement as set forth in 
the text.

     (cc) Successors and Assigns.  This Agreement shall be binding upon the 
parties hereto and their respective successors and assigns.

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

     (ee) Attorneys' Fees.  If the Company or any Holder brings an action to 
enforce its rights under this Agreement, the prevailing party in the action 
shall be entitled to recover its costs and expenses, including, without 
limitation, reasonable attorneys' fees, incurred in connection with such 
action, including any appeal of such action.

                            [signature page follows]


                                       12

<PAGE>

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

                                   PRIME GROUP REALTY TRUST


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


                                   SECURITY CAPITAL PREFERRED GROWTH
                                   INCORPORATED


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












                                       13

<PAGE>
                                    EXHIBIT C

                               TAG-ALONG AGREEMENT

     THIS TAG-ALONG AGREEMENT (the "Agreement") dated as of November    , 
1997 is among Prime Financing, L.P., Prime Group Limited Partnership, Prime 
Group II, L.P., Prime Group III, L.P., Prime Group IV, L.P., Prime Group V, 
L.P., The Prime Group, Inc., PG/Primestone, L.L.C., a Delaware limited 
liability company (together with their respective controlled Affiliates and 
their successors in interest pursuant to Section 4 hereof, the "Other 
Holders"), and Security Capital Preferred Growth Incorporated, a Maryland 
corporation (together with its successors in interest pursuant to Section 4 
hereof, "SCPG").

                              PRELIMINARY STATEMENT

     WHEREAS the Other Holders own Common Units, which interests, subject to 
certain conditions, are exchangeable for Common Shares.

     WHEREAS SCPG owns the Preferred Shares, which shares, subject to certain 
conditions, are convertible into Common Shares.

     WHEREAS the Other Holders and SCPG desire to enter into this Agreement 
to set forth certain agreements with respect to certain transfers by the 
Other Holders of their Common Shares; and

     WHEREAS the execution and delivery of this Agreement by the parties 
hereto is a condition to the closing of the Series A Preferred Securities 
Purchase Agreement, dated as of November 11, 1997, by and among Prime Group 
Realty Trust, Prime Group Realty, L.P. and SCPG.

     NOW THEREFORE, in consideration of the foregoing and other good and 
valuable consideration, the receipt and sufficiency of which is hereby 
acknowledged, the parties agree as follows:

1.   Definitions.  As used in this Agreement, the following terms shall have 
the following meanings:

          "Affiliate" means, with respect to any Person, any other Person 
directly or indirectly controlling, controlled by or under direct or indirect 
common control with the first Person and shall include any Person who is an 
officer, director or beneficial holder of at least 10% of the then 
outstanding capital stock (or other shares of beneficial interest or 
partnership interest) of the first Person entitled ordinarily to vote for the 
first Person's directors (or, for persons that are not corporations, for 
those Persons exercising functions similar to directors of a corporation) and 
immediate family members of any such officer, director or holder.

<PAGE>

          "Common Shares" means the common shares of beneficial interest, 
$.01 par value per share, of Prime Group Realty Trust and Common Share 
Equivalents.

          "Common Share Equivalents" means any security that is convertible 
into or exchangeable for Common Shares or upon the exercise of which Prime 
Group Realty Trust is required to issue Common Shares, whether or not such 
securities are then convertible, exchangeable or exercisable.

          "Common Units" means the common units of limited partner interest 
of Prime Group Realty, L.P.

          "Extraordinary Transaction" means (a) any merger, consolidation, 
recapitalization, other business combination or other similar action for 
which approval of the holders of Common Shares is required and has been 
obtained, or (b) any other Transfer (whether, pursuant to an exchange or 
tender offer or otherwise) involving the sale or disposition of 80% or more 
of the then outstanding Common Shares.

          "Person" means any corporation, limited liability company, 
partnership, association, organization, trust, individual, government or any 
agency or political subdivision thereof, or other entity.

          "Preferred Shares" means the shares of Series A cumulative 
convertible preferred shares of beneficial interest, $.01 par value per share 
of Prime Group Realty Trust.

          "Sale" means any Transfer by the Other Holders or by Primestone 
Investment Partners, L.P. of Common Shares, directly or indirectly, to one or 
more Persons who are not Affiliates controlled by the Other Holders if, after 
giving effect to such Transfer and all prior Transfers of Common Shares 
during the preceding 12 months, the Other Holders and Primestone Investment 
Partners, L.P. will have Transferred more than 15% of the number of Common 
Shares beneficially owned by the Other Holders and Primestone Investment 
Partners, L.P., in the aggregate, at the beginning of such 12-month period 
(as adjusted for stock splits or stock dividends, or in connection with a 
combination of shares, recapitalization, merger, consolidation or other 
reorganization); provided, however, that the term "Sale" shall not apply to 
Transfers by Primestone Investment Partners, L.P., the proceeds of which are 
used either (a) to repay margin loan indebtedness of Primestone Investment 
Partners, L.P. or (b) to fund distributions to affiliates of The Blackstone 
Group.

          "Sale Notice" shall have the meaning ascribed to such term in 
Section 2(a) of this Agreement.

          "Securities Act" means the Securities Act of 1933, as amended from 
time to time.

          "Terms Notice" shall have the meaning ascribed to such term in 
Section 2(b) of 

                                        2

<PAGE>

this Agreement.

          "Tag-Along Rights" shall have the meaning ascribed to such term in 
Section 2 of this Agreement.

     "Transfer" means any direct or indirect sale, transfer, distribution, 
assignment, bequest, pledge, hypothecation, encumbrance, grant of a security 
interest in, or grant, issuance, sale or conveyance of an option, warrant or 
right to acquire, or other disposition of, one or more Common Shares; 
provided, however, that a Transfer shall not include (i) sales or 
dispositions made pursuant to a broadly distributed, underwritten public 
offering pursuant to an effective registration statement under the Securities 
Act, (ii) any pledge (including any foreclosure or seizure resulting from 
such pledge) to a bona fide financial institution or other business 
organization with a net worth in excess of $25 million for the purpose of 
securing bona fide indebtedness (including any guarantee or other obligation 
related thereto) of the Other Holders or (iii) sales or dispositions pursuant 
to an Extraordinary Transaction.

     "Transferee" means the recipient, directly or indirectly, of one or more 
Common Shares or any interest therein pursuant to a Transfer.

2.   Sale of Common Shares.  The Other Holders agree, that in the event that 
the Other Holders wish to engage in a Sale, to offer to SCPG the right to 
participate in such sale in the manner and on the terms set forth in this 
Section 2 (the rights of SCPG to participate in a Sale of Common Shares 
hereunder are referred to herein as the "Tag-Along Rights").

     (a)  Offer.  At least three business days prior to any Sale, the Other 
Holders shall deliver a written notice (the "Sale Notice") to SCPG which 
shall include:

          (i)  A description of the proposed Sale, specifying in reasonable 
detail the proposed terms and conditions of the proposed Sale, including the 
number of Common Shares proposed to be transferred as a result of such Sale, 
the purchase price (or liquidation value) of such Shares, the name and 
address of the proposed transferee(s), and the closing date of the proposed 
Sale.

          (ii) An offer by the Other Holders to include in the proposed Sale 
to the proposed transferee, at the option of SCPG, on the same terms and 
conditions as the proposed Sale, up to one Common Share for each two Common 
Shares to be sold by the Other Holders in the proposed Sale.

     (b)  Notice of Proposed Sale.  The Other Holders shall notify SCPG in 
writing (the "Terms Notice") of the terms of the Sale as soon as practicable 
after such terms are determined, but in any event at least one business day 
prior to the Sale.

     (c)  Time and Manner of Exercise.  If SCPG desires to accept the offer 
contained in 

                                        3

<PAGE>

the Sale Notice, it shall notify the Other Holders in writing before 5:00 
p.m. Chicago time on the business day following the date of receipt of the 
Terms Notice, which notice shall specify the number of Common Shares for 
which such offer has been accepted.  If SCPG has not so accepted such offer 
in writing it shall be deemed to have waived all of its Tag-Along Rights with 
respect to the proposed Sale, and the Other Holders shall be free, for a 
period of 90 days from and after the date of receipt by SCPG of the Terms 
Notice, to transfer the Common Shares specified in the Sale Notice but only 
on terms no more favorable to the Other Holders than the terms described in 
the Sale Notice and the Terms Notice, and any sale in violation of this 
provision shall be invalid.

     (d)  Other Agreements.

          (i)  The Other Holders shall use their best efforts to obtain the 
agreement of the prospective transferees) to the participation of SCPG in any 
contemplated Sale, and the Other Holders shall not transfer any of their 
Common Shares to the prospective transferee(s) if the prospective 
transferees) declines to allow the participation of SCPG as contemplated by 
this Section 2, and any sale in violation of this provision shall be invalid. 
 If SCPG elects to exercise its Tag-Along Rights hereunder, SCPG shall take 
such actions and execute such documents and instruments as may be requested 
by the Other Holders and as shall be reasonably necessary in order to 
consummate the proposed Sale on the same terms as the Other Holders.  Each of 
the Other Holders and SCPG shall bear their or its own costs and expenses 
incurred in connection with any proposed Sale.

          (ii) Prime Group Realty Trust agrees that, if requested by SCPG in 
writing, it will accelerate, pursuant to Section 3 of the Declaration 
creating the Preferred Shares, the date on which the Preferred Shares are 
convertible so as to permit SCPG to sell such number of Common Shares that it 
has elected to sell pursuant to Section 2 of this Agreement.

          (iii)     PG/Primestone, L.L.C., as managing general partner of 
Primestone Investment Partners, L.P., shall not vote for or consent to (and 
none of the Other Holders shall vote or cause any of their Affiliates to vote 
for or consent to) any sale of Common Shares by Primestone Investment 
Partners, L.P. (except with respect to Transfers described in the proviso to 
the definition of "Sale" in Section I hereof) unless in connection with such 
Transfer, SCPG is granted Tag-Along Rights in accordance with Section 2 
hereof.

     (e)  Abandonment of Sale.  The Other Holders shall have the right, in 
their sole discretion, at all times prior to consummation of the proposed 
Sale to abandon, rescind annul, withdraw or otherwise terminate such Sale, 
and the Other Holders shall not have any liability or obligation to SCPG with 
respect thereto by virtue of such abandonment, rescission, annulment, 
withdrawal or termination.

3.   Form of Agreement Satisfactory to SCPG.  Any agreement which SCPG may be 
requested or required to execute in connection with Section 2 hereof must be 
in form and substance reasonably satisfactory to SCPG.  No provision in this 
Agreement, including, without 

                                        4

<PAGE>

limitation, Section 2 hereof, shall require SCPG to make any representation 
(other than as to title, due authorization and enforceability relating solely 
to SCPG) or provide any indemnification in any such agreement (other than 
indemnification for breaches of the representations set forth in the 
preceding clause) and no right or obligation of SCPG shall be conditioned 
upon the making of such representation or the provision of such 
indemnification.

4.   Miscellaneous.

     (a)  Notices.  Notices and other communications provided for in this 
Agreement shall be in writing and shall be either delivered by reputable 
courier service (charges prepaid), sent by confirmed facsimile transmission 
or sent by certified mail (postage prepaid and return receipt requested) 
addressed to the party or parties sought to be charged with notice of the 
same at the respective addresses set forth below, subject to written notice 
of change of address given by any party to the other parties:

          IF TO THE OTHER
          HOLDERS:            The Prime Group, Inc.
                              77 West Wacker, Suite 3900 
                              Chicago, Illinois 60601
                              Attention:     Michael W. Reschke 
                                             Robert J. Rudnik
                              Fax: (312) 917-1511

          with a copy to:     Wayne D. Boberg
                              Winston & Strawn
                              35 West Wacker Drive
                              Chicago, Illinois 60601
                              Fax: (312) 558-5700

          IF TO SCPG:         Security Capital Preferred Growth  Incorporated
                              11 South LaSalle Street
                              Chicago, Illinois 60603
                              Attention:     Daniel F. Miranda 
                                             David E. Rosenbaum 
                                             Joshua D. Goldman
                              Fax: (312) 345-5888

          with a copy to:     Mayer, Brown & Platt
                              190 South LaSalle Street
                              Chicago, Illinois 60603
                              Attention:     Philip J. Niehoff, Esq.
                              Fax: (312) 701-7711

                                        5

<PAGE>

     Notice shall be effective and deemed to have been received (i) when 
delivered in person, (ii) when sent by fax with receipt acknowledged, (iii) 
five (5) days after having been mailed by certified or registered United 
States mail, postage prepaid, return receipt requested, or (iv) the next 
business day after having been sent by a nationally recognized overnight mail 
or courier service, receipt requested.

     (b)  Changes and Modifications; Termination, Actions under this 
Agreement.  This Agreement may be terminated, changed, modified or extended, 
and consents hereunder may be granted, only by an agreement in writing signed 
by SCPG and the owners of a majority of the Common Shares owned by the Other 
Holders.

     (c)  Complete Agreement.  This Agreement embodies the complete agreement 
and understanding among the parties and supersedes and preempts any prior 
understandings, agreements, or representations by or among the parties, 
written or oral, which may have related to the subject matter hereof in any 
way.  This Agreement shall be binding upon and inure to the benefit of the 
parties hereto and their respective successors and assigns (including, 
without limitation, successor holders of Shares); provided, however, that 
SCPG may not assign or transfer its rights or obligations hereunder without 
the prior written consent of the owners of a majority of the Common Shares 
held by the Other Holders, except to one or more Persons of the types 
specified in Section 8.2 of the Purchase Agreement.

     (d)  Counterparts.  This Agreement may be executed in counterparts, each 
of which shall be deemed an original, but all of which taken together shall 
constitute one instrument.

     (e)  Severability.  If in any judicial proceeding a court shall refuse 
to enforce any provision of this Agreement, then such unenforceable provision 
shall be deemed eliminated from this Agreement for the purpose of such 
proceeding to the extent necessary to permit the remaining provisions to be 
enforced.

     (f)  Governing Law.  This Agreement shall be governed by the laws of the 
State of Maryland without giving effect to the conflict of laws rules of any 
jurisdiction.

     (g)  Remedies.  The parties hereto shall have all remedies for breach of 
this Agreement available to them provided by law or equity.  Without limiting 
the generality of the foregoing, the parties agree that in addition to all 
other rights and remedies available at law or in equity, the parties shall be 
entitled to obtain specific performance of the obligations of each party to 
this Agreement and immediate injunctive relief, and that in the event any 
action or proceeding is brought in defense, that there is an inadequate 
remedy at law.

     (h)  Transfers.  It shall be a condition to any Transfer of Common 
Shares to Affiliates of Michael W. Reschke that the Transferee agree in 
writing to be bound by the obligations of the Other Holders pursuant to, and 
as provided in, this Agreement, whereupon such Transferee shall be deemed to 
be a successor in interest of the Other Holders for all purposes of this 
Agreement 

                                        6

<PAGE>

(but which subsequent agreement shall not relieve the Other Holders of their 
obligations hereunder).  Any Transfer in violation of this provision shall be 
void.

     (i)  Termination.  This Agreement shall terminate on the date on which 
SCPG shall cease to own Common Shares issued or issuable upon conversion or 
exchange of the Preferred Shares representing at least five percent of the 
then outstanding Common Shares (on a fully diluted basis).

                             [Signature Page Follows]











                                       7
                                         
<PAGE>

     IN WITNESS WHEREOF, the parties have executed this Agreement as of the 
date set forth above.

                                   ------------------------------------------
                                                                            
                                   Michael W. Reschke



                                   PRIME GROUP REALTY TRUST



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



                                   PRIME GROUP REALTY, L.P.

                                   By:  Prime Group Realty Trust, its
                                        managing general partner


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



                                   PRIME GROUP II, L.P., PRIME GROUP III,
                                   L.P., PRIME GROUP IV, L.P., PRIME GROUP
                                   V, L.P.

                                   By:  PGLP, Inc., its sole General
                                        Partner



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



                                   PRIME GROUP LIMITED PARTNERSHIP


                                   ------------------------------------------
                                   By:  Michael W. Reschke, its Managing
                                        General Partner          



<PAGE>



                                   PRIME FINANCING, L.P.

                                   By:  Prime Financing, Inc., its sole
                                        General Partner


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



                                   THE PRIME GROUP, INC.



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



                                   PG/PRIMESTONE, L.L.C.



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



                                   SECURITY CAPITAL PREFERRED GROWTH
                                   INCORPORATED



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


 

<PAGE>

ACCEPTED AND AGREED TO
WITH RESPECT TO SECTION 2(d)(ii):

Prime Group Realty, L.P.

By:  Prime Group Realty Trust, its 
     managing general partner


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


PRIME GROUP REALTY TRUST


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

 

<PAGE>

                                   EXHIBIT D


                                November    , 1997




Security Capital Markets Group Incorporated
399 Park Avenue
New York, New York 10022
Attention:  Mr. Garret C. House, Vice President

     Re:  Prime Group Realty Trust

Gentlemen:

     This letter confirms the appointment of Security Capital Markets Group 
Incorporated ("SCMG") by Prime Group Realty Trust (the "Company") and Prime 
Group Realty, L.P. (the "Operating Partnership") as a Placement Agent in 
connection with that certain Series A Preferred Securities Purchase Agreement 
(the "Purchase Agreement") by and among the Company, the Operating 
Partnership and Security Capital Preferred Growth Incorporated ("SCPG"), 
pursuant to which SCPG is purchasing 2 million shares of the Company's Series 
A Cumulative Convertible Preferred Shares of Beneficial Interest (the 
"Securities").  Nothing herein shall constitute an undertaking by SCMG to 
underwrite or otherwise purchase the Securities.

     For these services, the Company and the Operating Partnership jointly 
agree that SCMG's compensation hereunder will consist of a fee (the "Fee") 
equal to 1% of the Aggregate Purchase Price (as defined in the Purchase 
Agreement) of all Securities purchased by SCPG pursuant to the Purchase 
Agreement.  Such fee shall be payable at or prior to the Closing Date (as 
defined in the Purchase Agreement).  The Company and the Operating 
Partnership agree and acknowledge that no fee payable to any other finder, 
broker, broker-dealer or other party shall reduce the Fee payable hereunder.

     Each of SCMG, the Company and the Operating Partnership agrees that (i) 
in connection with the sale of the Securities, neither it nor any person 
acting on its behalf has offered or sold or will offer or sell the Securities 
by any form of general solicitation or general advertising, including but not 
limited to the following: (A) any advertisement, article, notice or other 
communication published in any newspaper or broadcast over television or 
radio or (B) any seminar or meeting whose attendees were invited by any 
general solicitation or general advertising; and (ii) it has solicited and 
will solicit offers for Securities only from and will offer Securities only 
to, investors that it has a reasonable basis to believe are "accredited 
investors" within the meaning of Rule 501 (a) under the Securities Act of 
1933, as amended.

<PAGE>

 
     In consideration for SCMG agreeing to provide the services referred to 
herein, the Company and the Operating Partnership jointly agree to indemnify 
and hold harmless SCMG, its affiliates and each other entity or person, if 
any, controlling SCMG or any of its affiliates within the meaning of the 
federal securities laws, and their respective directors, officers and 
employees (SCMG and each such entity or person being referred to as an 
"Indemnified Person"), from and against any claim by any third party for any 
losses, claims, damages or liabilities (or actions in respect thereof) 
relating to or arising out of the services performed pursuant to this 
agreement, the purchase contemplated hereby or SCMG's role in connection 
therewith, and to reimburse any Indemnified Person for all expenses 
(including, without limitation, reasonable fees and disbursements of counsel) 
incurred in connection with any action, suit or proceeding in relation 
thereto or in connection therewith, other than any such losses, claims, 
damages, liabilities or expenses of any Indemnified Person that are 
determined by final judgment of a court of competent jurisdiction to have 
resulted primarily from actions taken or omitted to be taken by such 
Indemnified Person in bad faith or from such Indemnified Person's gross 
negligence or SCMG's intentional and material breach of this agreement. The 
Company shall not be liable for any settlement of any proceeding effected 
without its prior written consent, but if settled with such consent or if 
there be a final judgment for the plaintiff, the Company agrees to indemnify 
the Indemnified Person from and against any loss or liability by reason of 
such settlement or judgment subject to the rights of the Company in this 
paragraph to claim exemption from its indemnity obligations.  The Company 
shall not, without the prior written consent of any Indemnified Person, 
effect any settlement of any proceeding in respect of which such Indemnified 
Person is a party and indemnity could have been sought hereunder by such 
Indemnified Person, unless such settlement includes an unconditional release 
of such Indemnified Person from all liability on claims that are the subject 
matter of such proceeding.

     This agreement shall be governed by the internal laws of the state of 
Illinois.  This agreement may be terminated at any time by the Company or 
SCMG upon written notice to the other party; provided that the 
representations and indemnity obligations of the Company hereunder and the 
obligation of the Company to pay SCMG the Fee shall survive any termination 
of SCMG's engagement hereunder and any sale of such Securities. 

<PAGE>

     Please indicate your agreement with this understanding by signing the 
letter below and returning it to the undersigned.

                              Sincerely,

                              PRIME GROUP REALTY TRUST



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


                              Prime Group Realty, L.P.

                              By:  Prime Group Realty Trust, its general
                                   partner 


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


Accepted and Agreed to as of the date set forth above:

SECURITY CAPITAL MARKETS GROUP INCORPORATED



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



<PAGE>

                                                                   EXHIBIT 10.31
                                 TAG-ALONG AGREEMENT



     THIS TAG-ALONG AGREEMENT (the "Agreement") dated as of November 17, 1997 is
among Prime Financing, L.P., Prime Group Limited Partnership, Prime Group II,
L.P., Prime Group III, L.P., Prime Group IV., L.P., Prime Group V, L.P., The
Prime Group, Inc., PG/Primestone, L.L.C., a Delaware limited liability company
(together with their respective controlled Affiliates and their successors in
interest pursuant to SECTION 4 hereof, the "Other Holders"), and Security
Capital Preferred Growth Incorporated, a Maryland corporation (together with its
successors in interest pursuant to SECTION 4 hereof, "SCPG").

                               PRELIMINARY STATEMENT

     WHEREAS the Other Holders own Common Units, which interests, subject to
certain conditions, are exchangeable for Common Shares.

     WHEREAS SCPG owns the Preferred Shares, which shares, subject to certain
conditions, are convertible into Common Shares.
     
     WHEREAS the Other Holders and SCPG desire to enter into this Agreement to
set forth certain agreements with respect to certain transfers by the Other
Holders of their Common Shares; and

     WHEREAS the execution and delivery of this Agreement by the parties hereto
is a condition to the closing of the Series A Preferred Securities Purchase
Agreement, dated as of November 11, 1997, by and among Prime Group Realty Trust,
Prime Group Realty, L.P. and SCPG.
     
     NOW THEREFORE, in consideration of the foregoing and other good and
valuable consideration, the receipt and sufficiency of which is hereby
acknowledged, the parties agree as follows:

     1.   DEFINITIONS.  As used in this Agreement, the following term shall have
the following meanings:

     "AFFILIATE" means, with respect to any Person, any other Person directly or
indirectly controlling, controlled by or under direct or indirect common control
with the first Person and shall include any Person who is an officer, director
or beneficial holder of at least 10% of the then outstanding capital stock (or
other shares of beneficial interest or partnership interest) of the first Person
entitled ordinarily to vote for the first Person's directors (or, for persons
that are not corporations, for those Persons exercising functions similar to
directors of a corporation) and immediate family members of any such officer,
director or holder.  

<PAGE>

     "COMMON SHARES" means the common shares of beneficial interest, $.01 par
value per share, of Prime Group Realty Trust and Common Share Equivalents.

     "COMMON SHARE EQUIVALENTS" means any security that is convertible into or
exchangeable for Common Shares or upon the exercise of which Prime Group Realty
Trust is required to issue Common Shares, whether or not such securities are
then convertible, exchangeable or exercisable.

     "COMMON UNITS" means the common units of limited partner interest of Prime
Group Realty, L.P.

     "EXTRAORDINARY TRANSACTION" means (a) any merger, consolidation,
recapitalization, other business combination or other similar action for which
approval of the holders of Common Shares is required and has been obtained, or
(b) any other Transfer (whether, pursuant to an exchange or tender offer or
otherwise) involving the sale or disposition of 80% or more of the then
outstanding Common Shares.    

     "PERSON" means any corporation, limited liability company, partnership,
association, organization, trust, individual, government or any agency or
political subdivision thereof, or other entity.

     "PREFERRED SHARES" means the shares of Series A cumulative convertible
preferred shares of beneficial interest, $.01 par value per share of Prime Group
Realty Trust.

     "SALE" means any Transfer by the Other Holders or by Primestone Investment
Partners, L.P. of Common Shares, directly or indirectly, to one or more Persons
who are not Affiliates controlled by the Other Holders if, after giving effect
to such Transfer and all prior Transfers of Common Shares during the preceding
12 months, the Other Holders and Primestone Investment Partners, L.P. will have
Transferred more than 15% of the number of Common shares beneficially owned by
the Other Holders and Primestone Investment Partners, L.P., in the aggregate, at
the beginning of such 12-month period (as adjusted for stock splits or stock
dividends, or in connection with a combination of shares, recapitalization,
merger, consolidation or other reorganization); provided, however, that the term
"Sale" shall not apply to Transfers by Primestone Investment Partners, L.P., the
proceeds of which are used either (a) to repay margin loan indebtedness of
Primestone Investment Partners, L.P. or (b) to fund distributions to affiliates
of The Blackstone Group.

     "SALE NOTICE" shall have the meaning ascribed to such items in SECTION 2(a)
of this Agreement.

     "SECURITIES ACT" means the Securities Act of 1933, as amended from time to
time.

     "TERMS NOTICE" shall have the meaning ascribed to such term in SECTION 2(b)
of this Agreement.

                                         -2-
<PAGE>

     "TAG-ALONG RIGHTS" shall have the meaning ascribed to such term in SECTION
2 of this Agreement.

     "TRANSFER" means any direct or indirect sale, transfer, distribution,
assignment, bequest, pledge, hypothecation, encumbrance, grant of a security
interest in, or grant, issuance, sale or conveyance of an option, warrant or
right to acquire, or other disposition of, one or more Common Shares; provided,
however, that a Transfer shall not include (i) sales or dispositions made
pursuant to a broadly distributed, underwritten public offering pursuant to an
effective registration statement under the Securities Act, (ii) any pledge
(including any foreclosure or seizure resulting from such pledge) to a bona fide
financial institution or other business organization with a net worth in excess
of $25 million for the purpose of securing bona fide indebtedness (including any
guarantee or other obligation related thereto) of the Other Holders or (iii)
sales or dispositions pursuant to an Extraordinary Transaction.

     "TRANSFEREE" means the recipient, directly or indirectly, of one or more
Common Shares or any interest therein pursuant to a Transfer.

     2.   SALE OF COMMON SHARES.  The Other Holders agree, that in the event
that the Other Holders wish to engage in a Sale, to offer to SCPG the right to
participate in such sale in the manner and on the terms set forth in this
SECTION 2 (the rights of SCPG to participate in a Sale of Common Shares
hereunder are referred to herein as the "TAG-ALONG RIGHTS").

          (a)  OFFER.  At least three business days prior to any Sale, the Other
Holders shall deliver a written notice (the "SALE NOTICE") to SCPG which shall
include:

          (i)  A description of the proposed Sale, specifying in reasonable
detail the proposed terms and conditions of the proposed Sale, including the
number of Common shares proposed to be transferred as a result of such Sale, the
purchase price (or liquidation value) of such Shares, the name and address of
the proposed transferee(s), and the closing date of the proposed Sale.

          (ii) An offer by the Other Holders to include in the proposed Sale to
the proposed transferee, at the option of SCPG, on the same terms and conditions
as the proposed Sale, up to one Common Share for each two Common Shares to be
sold by the Other Holders in the proposed Sale.

          (b)  NOTICE OF PROPOSED SALE.  The Other Holders shall notify SCPG in
writing (the "TERMS NOTICE") of  the terms of the Sale as soon as practicable
after such terms are determined, but in any event at least one business day
prior to the Sale.

          (c)  TIME AND MANNER OF EXERCISE.  If SCPG desires to accept the offer
contained in the Sale Notice, it shall notify the Other Holders in writing
before 5:00 p.m. Chicago time on the business day following the date of receipt
of the Terms Notice, which notice shall specify the number of Common Shares for
which such offer has been accepted.  If SCPG has not so accepted such offer 

                                         -3-
<PAGE>

in writing it shall be deemed to have waived all of its Tag-Along Rights with
respect to the proposed Sale, and the Other Holders shall be free, for a period
of 90 days from and after the date of receipt by SCPG of the Terms Notice, to
transfer the Common Shares specified in the Sale Notice but only on terms no
more favorable to the Other Holders than the terms described in the Sale Notice
and the Terms Notice, and any sale in violation of this provision shall be
invalid.

          (d)  OTHER AGREEMENTS.

          (i)    The Other Holders shall use their best efforts to obtain the
agreement of the prospective transferee(s) to the participation of SCPG in any
contemplated Sale, and the Other Holders shall not transfer any of their Common
Shares to the prospective transferee(s) if the prospective transferee(s)
declines to allow the participation of SCPG as contemplated by this Section 2,
and any sale in violation of this provision shall be invalid.  If SCPG elects to
exercise its Tag-Along Rights hereunder, SCPG shall take such actions and
execute such documents and instruments as may be requested by the Other Holders
and as shall be reasonably necessary in order to consummate the proposed Sale on
the same terms as the Other Holders.  Each of the Other Holders and SCPG shall
bear their or its own costs and expenses incurred in connection with any
proposed Sale.

          (ii)   Prime Group Realty Trust agrees that, if requested by SCPG in
writing, it will accelerate, pursuant to Section 3 of the Declaration creating
the Preferred Shares, the date on which the Preferred Shares are convertible so
as to permit SCPG to sell such number of Common Shares that it has elected to
sell pursuant to SECTION 2 of this Agreement.

          (iii)  PG/Primestone, L.L.C., as managing general partner of
Primestone Investment Partners, L.P., shall not vote for or consent to (and none
of the Other Holders shall vote or cause any of their Affiliates to vote for or
consent to) any sale of Common Shares by Primestone Investment Partners, L.P.
(except with respect to Transfers described in the Proviso to the definition of
"Sale" in Section 1 hereof) unless in connection with such Transfer, SCPG is
granted Tag-Along Rights in accordance with Section 2 hereof.

          (e)    ABANDONMENT OF SALE.  The Other Holders shall have the right,
in their sole discretion, at all times prior to consummation of the proposed
Sale to abandon, rescind, annul, withdraw or otherwise terminate such Sale, and
the Other Holders shall not have any liability or  obligation to SCPG with
respect thereto by virtue of such abandonment, rescission, annulment, withdrawal
or termination.

          3.     FORM OF AGREEMENT SATISFACTORY TO SCPG.  Any agreement which
SCPG may be requested or required to execute in connection with SECTION 2
hereof, must be in form and substance reasonably satisfactory to SCPG.  No
provision in this Agreement, including, without limitation, SECTION 2 hereof,
shall require SCPG to make any representation (other than as to title, due
authorization and enforceability relating solely to SCPG) or provide any
indemnification in any such agreement (other than indemnification for breaches
of the representations set forth in the preceding clause) and no right or
obligation of SCPG shall be conditioned upon the making of such 

                                         -4-
<PAGE>

representation or the provision of such indemnification.

          4.     MISCELLANEOUS.

          (a)    NOTICES.  Notices and other communications provided for in
this Agreement shall be in writing and shall be either delivered by reputable
courier service (charges prepaid), sent by confirmed facsimile transmission or
sent by certified mail (postage prepaid and return receipt requested) addressed
to the party or parties sought to be charged with notice of the same at the
respective addresses set forth below, subject to written notice of change of
address given by any party to the other parties:

     IF TO THE OTHER
      HOLDERS:        The Prime Group, Inc.
                      77 West Wacker, Suite 3900
                      Chicago, Illinois  60601
                      Attention:  Michael W. Reschke
                                  Robert J. Rudnik
                      Fax:  (312) 917-1511

     with a copy to:  Wayne D. Boberg
                      Winston & Strawn
                      35 West Wacker Drive
                      Chicago, Illinois  60601
                      Fax:  (312) 558-5700

     IF TO SCPG:      Security Capital Preferred Growth Incorporated
                      11 South LaSalle Street
                      Chicago, Illinois  60603
                      Attention:  Daniel F. Miranda
                                  David E. Rosenbaum
                                  Joshua D. Goldman
                      Fax:  (312) 345-5888

     with a copy to:  Mayer, Brown & Platt
                      190 South LaSalle Street
                      Chicago, Illinois  60603
                      Attention:  Philip J. Niehoff, Esq.
                      Fax:  (312) 701-7711

     Notice shall be effective and deemed to have been received (i) when
delivered in person, (ii) when sent by fax with receipt acknowledged, (iii) five
(5) days after having been mailed by certified or registered United States mail,
postage prepaid, return receipt requested, or (iv) the next business day after
having been sent by a nationally recognized overnight mail or courier service,
receipt 

                                         -5-
<PAGE>

requested.

          (b) CHANGES AND MODIFICATIONS; TERMINATION; ACTION UNDER THIS
AGREEMENT.  This Agreement may be terminated, changed, modified or extended, and
consents hereunder may be granted, only by an agreement in writing signed by
SCPG and the owners of a majority of the Common Shares owned by the Other
Holders.

          (c) COMPLETE AGREEMENT.  This Agreement embodies the complete 
agreement and understanding among the parties and supersedes and preempts any 
prior understandings, agreements, or representations by or among the parties, 
written or oral, which may have related to the subject matter hereof in any 
way. This Agreement shall be binding upon and inure to the benefit of the 
parties hereto and their respective successors and assigns (including, 
without limitation, successor holders of Shares); PROVIDED, HOWEVER, that 
SCPG may not assign or transfer its rights or obligations hereunder without 
the prior written consent of the owners of a majority of the Common Shares 
held by the Other Holders, except to one or more Persons of the types 
specified in Section 8.2 of the Purchase Agreement.

          (d) COUNTERPARTS.  This Agreement may be executed in counterparts,
each of which shall be deemed an original, but all of which taken together shall
constitute one instrument.

          (e) SEVERABILITY.  If in any judicial proceeding a court shall refuse
to enforce any provision of this Agreement, then such unenforceable provision
shall be deemed eliminated from this Agreement for the purpose of such
proceeding to the extent necessary to permit the remaining provisions to be
enforced.

          (f) GOVERNING LAW.  This Agreement shall be governed by the laws of
the State of Maryland without giving effect to the conflict of laws rules of any
jurisdiction.

          (g) REMEDIES.  The parties hereto shall have all remedies for breach
of this Agreement available to them provided by law or equity.  Without limiting
the generality of the foregoing, the parties agree that in addition to all other
rights and remedies available at law or in equity, the parties shall be entitled
to obtain specific performance of the obligations of each party to this
Agreement and immediate injunctive relief, and that in the event any action or
proceeding is brought in defense, that there is an inadequate remedy at law.

          (h) TRANSFERS.  It shall be a condition to any Transfer of Common
Shares to Affiliates of Michael W. Reschke that the Transferee agree in writing
to be bound by the obligations of the Other Holders pursuant to, and as provided
in, this Agreement, whereupon such Transferee shall be deemed to be a successor
in interest of the Other Holders for all purposes of this Agreement (but which
subsequent agreement shall not relieve the Other Holders of their obligations
hereunder).  Any Transfer in violation of this provision shall be void.

          (i) TERMINATION.  This Agreement shall terminate on the date on which
SCPG shall 

                                         -6-
<PAGE>

cease to own Common Shares issued or issuable upon conversion or exchange of the
Preferred Shares representing at least five percent of the then outstanding
Common Shares (on a fully diluted basis).


                              [Signature Page Follows]


                                         -7-
<PAGE>

          IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date set forth above.

                                       /s/   Michael W. Reschke
                                             ----------------------------------
                                             Michael W. Reschke


                               PRIME GROUP REALTY TRUST

                               By:   /s/ W. Michael Karnes
                                     ---------------------------------------
                               Its:  EXECUTIVE VP AND CHIEF FINANCIAL OFFICER


                               PRIME GROUP REALTY, L.P.

                               By:   Prime Group Realty Trust, its
                                     managing general partner

                               By:   /s/ W. Michael Karnes
                                     ----------------------------------------
                               Its:  Executive VP And Chief Financial Officer
                                     ----------------------------------------


                               PRIME GROUP II, L.P., PRIME GROUP
                               III, L.P., PRIME GROUP IV, L.P.,

                               PRIME GROUP V, L.P.

                               By:   PGLP, Inc., its sole General
                                     Partner

                               By:   /s/ Robert J. Rudnik
                                     ----------------------------------------
                               Its:  Vice President
                                     ----------------------------------------


                               PRIME GROUP LIMITED PARTNERSHIP

                               /S/   Michael W. Reschke                       
                                     ----------------------------------------
                               By:   Michael W. Reschke, its
                                     Managing General Partner


                               PRIME FINANCING, L.P.

                                         -8-
<PAGE>

                               By:   Prime Financing, Inc., its sole
                                     General Partner

                               THE PRIME GROUP, INC.

                               By:   /s/ Robert J. Rudnik
                                     ----------------------------------------
                               Its:  Vice President       


                               PG/PRIMESTONE, L.L.C.
                               By:   The Prime Group, Inc.,
                                     its Administrative Member

                               By:   /s/Robert J. Rudnik       
                                     ----------------------------------------
                               Its:  Vice President      


                               SECURITY CAPITAL PREFERRED
                               GROWTH INCORPORATED

                               By:   /s/ David Rosenbaum            
                                     ----------------------------------------
                               Its:  Vice President 


ACCEPTED AND AGREED TO
WITH RESPECT TO SECTION 2(d)(ii):

PRIME GROUP REALTY, L.P.

By:  Prime Group Realty Trust, its
     managing general partner


By:    /s/ W. Michael Karnes 
       -----------------------------------------
Name:  W. Michael Karnes   
       -----------------------------------------
Its:   Executive VP and Chief Financial Officer
       -----------------------------------------

PRIME GROUP REALTY TRUST

By:    /s/ W. Michael Karnes                    
       -----------------------------------------
Name:  W. Michael Karnes          
       -----------------------------------------
Its:   Executive VP and Chief Financial Officer
       -----------------------------------------

                                         -9-


<PAGE>
                                                                   EXHIBIT 10.32

                                PLACEMENT FEE LETTER
                                          
                                 November 17, 1997


Security Capital Markets Group Incorporated
399 Park Avenue
New York, New York  10022
Attention:  Mr. Garret C. House, Vice President

     Re:  Prime Group Realty Trust

Gentlemen:

     This letter confirms the appointment of Security Capital Markets Group
Incorporated ("SCMG") by Prime Group Realty Trust (the "Company") and Prime
Group Realty, L.P. (the "Operating Partnership") as a Placement Agent in
connection with that certain Series A Preferred Securities Purchase Agreement
(the "Purchase Agreement") by and among the Company, the Operating Partnership
and Security Capital Preferred Growth Incorporated ("SCPG"), pursuant to which
SCPG is purchasing 2 million shares of the Company's Series A Cumulative
Convertible Preferred Shares of Beneficial Interest (the "Securities").  Nothing
herein shall constitute an undertaking by SCMG to underwrite or otherwise
purchase the Securities.

     For these services, the Company and the Operating Partnership jointly agree
that SCMG's compensation hereunder will consist of a fee (the "Fee") equal to 1%
of the Aggregate Purchase Price (as defined in the Purchase Agreement) of all
Securities purchased by SCPG pursuant to the Purchase Agreement.  Such fee shall
be payable at or prior to the Closing Date (as defined in the Purchase
Agreement).  The Company and the Operating Partnership agree and acknowledge
that no fee payable to any other finder, broker, broker-dealer or other party
shall reduce the Fee Payable hereunder.

     Each of SCMG, the Company and the Operating Partnership agrees that (i) in
connection with the sale of the Securities, neither it nor any person acting on
its behalf has offered or sold or will offer or sell the Securities by any form
of general solicitation or general advertising, including but not limited to the
following:  (A) any advertisement, article, notice or other communication
published in any newspaper or broadcast over television or radio or (B) any
seminar or meeting whose attendees were invited by any general solicitation or
general advertising; and (ii) it has solicited and will solicit offers for
Securities only from and will offer Securities only to, investors that it has a
reasonable basis to believe are "accredited investors" within the meaning of
Rule 501(a) under the Securities Act of 1933, as amended.

<PAGE>

     In consideration for SCMG agreeing to provide the services referred to
herein, the Company and the Operating Partnership jointly agree to indemnify and
hold harmless SCMG, its affiliates and each other entity or person, if any,
controlling SCMG or any of its affiliates within the meaning of the federal
securities laws, and their respective directors, officers and employees (SCMG
and each such entity or person being referred to as an "Indemnified Person"),
from and against any claim by any third party for any losses, claims, damages or
liabilities (or actions in respect thereof) relating to or arising out of the
services performed pursuant to this agreement, the purchase contemplated hereby
or SCMG's role in connection therewith, and to reimburse any Indemnified Person
for all expenses (including, without limitation, reasonable fees and
disbursements of counsel) incurred in connection with any action, suit or
proceeding in relation thereto or in connection therewith, other than any such
losses, claims, damages, liabilities or expenses of any Indemnified Person that
are determined by final judgment of a court of competent jurisdiction to have
resulted primarily from actions taken or omitted to be taken by such Indemnified
Person in bad faith or from such Indemnified Person's gross negligence or SCMG's
intentional and material breach of this agreement.  The Company shall not be
liable for any settlement of any proceeding effected without its prior written
consent, but if settled with such consent or if there be a final judgment for
the plaintiff, the Company agrees to indemnify the Indemnified Person from and
against any loss or liability by reason of such settlement or judgment subject
to the rights of the Company in this paragraph to claim exemption from its
indemnity obligations.  The Company shall not, without the prior written consent
of any Indemnified Person, effect any settlement of any proceeding in respect of
which such Indemnified Person is a party and indemnity could have been sought
hereunder by such Indemnified Person, unless such settlement includes an
unconditional release of such Indemnified Person from all liability on claims
that are the subject matter of such proceeding.

     This agreement shall be governed by the internal laws of the state of
Illinois.  This agreement may be terminated at any time by the Company or SCMG
upon written notice to the other party; provided that the representations and
indemnity obligations of the Company hereunder and the obligation of the Company
to pay SCMG the Fee shall survive any termination of SCMG's engagement hereunder
and any sale of such Securities.

<PAGE>

     Please indicate your agreement with this understanding by signing the
letter below and returning it to the undersigned.

                              Sincerely,

                              PRIME GROUP REALTY TRUST

                              By:/s/ W. Michael Karnes
                                 --------------------------------
                              Name  W. Michael Karnes
                                  -------------------------------
                              Its  Executive Vice President and
                                 --------------------------------
                                  Chief Financial Officer
                                  -------------------------------

                              PRIME GROUP REALTY, L.P.

                              By:  Prime Group Realty Trust, its
                                   general partner

                              By: /s/ W. Michael Karnes
                                  ------------------------------
                              Name  W. Michael Karnes
                                  ------------------------------
                              Its  Executive Vice President and
                                  ------------------------------
                                  Chief Financial Officer
                                  ------------------------------


Accepted and Agreed to as of the date set forth above:

SECURITY CAPITAL MARKETS GROUP INCORPORATED


By: /s/ Garret C. House
    --------------------
Name  Garret C. House
    --------------------
Its  Vice  President
   ---------------------



<PAGE>

                                    EXHIBIT 10.33

                              INDEMNIFICATION AGREEMENT

     INDEMNIFICATION AGREEMENT (the "Agreement"), dated as of November 17, 1997
between PRIME GROUP REALTY, L.P., a Delaware limited partnership ("UpREIT"), and
THE PRIME GROUP, INC., an Illinois corporation ("Prime").

          WHEREAS, the UpREIT has entered into that certain Tax Indemnification
Agreement, dated as of November 17, 1997 (the "Nardi Tax Indemnity Agreement")
with Stephen J. Nardi, an individual, Narco Enterprises, Inc., an Illinois
corporation, and Nardi Group Limited, a Delaware corporation (collectively, the
"Nardi Indemnitees"); 

          WHEREAS, the UpREIT has entered into that certain Tax Indemnification
Agreement, dated as of November 17, 1997 (the "Hadesman Tax Indemnity
Agreement") with Ed Hadesman, an individual, Edward S. Hadesman Trust Dated May
22, 1992, Edward S. Hadesman, Trustee; Grandville/Northwestern  Management
Corporation, an Illinois corporation; Carolyn B. Hadesman  Trust Dated May 21,
1992,  Carolyn B. Hadesman, Trustee; Lisa Hadesman 1991 Trust, Edward S.
Hadesman, Trustee; Cynthia Hadesman 1991 Trust, Edward S. Hadesman, Trustee;
Tucker B. Magid, an individual; Frances S. Shubert, an individual; Grandville
Road Property, Inc., an Illinois corporation; and Sky Harbor Associates,  an
Illinois limited partnership (collectively, the "Hadesman Indemnitees"); 

     NOW THEREFORE, in consideration of the premises and of the mutual
agreements herein contained and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto
agree as follows:

          Section 1.     DEFINITIONS. For purposes of the Agreement, capitalized
terms used herein and not otherwise defined herein shall have the meanings
assigned to them in the Partnership Agreement or either of the Hadesman Tax
Indemnity Agreement or the Nardi Tax Indemnity Agreement (collectively, the "Tax
Indemnity Agreements"); provided however for purposes of this Agreement the term
"After-tax Basis" shall take into account all federal, applicable state and
applicable local and municipal income taxes.  Any term defined by reference to
an agreement, instrument or other document shall have the meaning so assigned to
it whether or not such document is in effect.  Unless otherwise indicated,
references in the Agreement to articles, Sections, paragraphs, clauses,
appendices, schedules and exhibits are to the same contained in or attached to
this Agreement.

          Section 2.  INDEMNIFICATION.  Prime shall indemnify and hold harmless,
on an After Tax Basis, UpREIT against any amount due and payable to a Nardi
Indemnitee or a Hadesman Indemnitee pursuant to the Tax Indemnity Agreements
("Indemnity Payment"), determined after taking into account all deductions,
credits, or other federal and applicable state income tax benefits then realized
by UpREIT and resulting from (a) such Indemnity Payment, or (b) the receipt of
any indemnity payment made under this Agreement. 

<PAGE>

          Section 3.  NOTIFICATION/PAYMENT.  

     (a)  UpREIT shall notify Prime orally and in writing of as soon as possible
of its receipt of any oral or written notification or written certificate
described in Section 4 of each of the Hadesman Tax Indemnity Agreement or the
Nardi Tax Indemnity Agreement.

     (b)  UpREIT agrees to act in good faith to claim any tax benefits
(including filing claims for refunds and amended tax returns) and take such
other actions as may be reasonable to minimize the net amount of any indemnity
payment due from Prime hereunder and to maximize the amount of its tax savings;
PROVIDED, HOWEVER, that UpREIT shall not be required to take any action which,
in its good faith judgment, would have any material adverse business
consequences to it or to Prime Group Realty Trust. Prime shall have the right to
timely and comprehensively review any computation of any Indemnity Payment
received or prepared by UpREIT or the independent accounting firm described in
Section 4 of each Tax Indemnity Agreement. 

     (c)  Any payment due to UpREIT pursuant to this Section 2 shall be paid
upon the time an Indemnity Payment is due under the respective Tax Indemnity
Agreement.

          Section 4. EXCLUSIONS.  

     Notwithstanding the foregoing, Prime shall not have any liability for
indemnification under this Agreement to the extent the amount otherwise
indemnifiable is payable by UpREIT as a result of one or more of the following: 

          (a)  The failure of UpREIT (or any of its Affiliates, other than
Prime) to use its best efforts to avoid liability to a Hadesman Indemnitee or
Nardi Indemnitee under the Tax Indemnity Agreements (including, without
limitation, the failure to pursue a like kind exchange under Code Section 1031
in respect of the transaction that gave rise to the Indemnity Payment); 

          (b)  The gross negligence or the willful misconduct of UpREIT (or any
of its Affiliates, other than Prime);

          (c)  The breach by UpREIT (or any of its Affiliates, other than Prime)
of any of its representations, warranties or covenants under this Agreement or
any Tax Indemnity Agreement.

          Section 5.  CONTESTS.

          (a)  To the extent that UpREIT is permitted or has any discretion
under the relevant Tax Indemnity Agreement to contest an issue that may result
in Prime owing UpREIT an Indemnity Payment, or otherwise to make decisions or
give its consent in respect of such contest or any other matter within such Tax
Indemnity Agreement that could affect Prime's obligation to indemnity UpREIT
under this Agreement, UpREIT (i) shall take direction from Prime (which shall be
given on a timely basis) in respect of all such decisions, discretion or
consents relating to such 

                                         -2-
<PAGE>

contest or matters, and (ii) shall permit Prime to have access to all
information and to participate in all proceedings, as it deems necessary in its
sole reasonable discretion, in order to give the direction to Prime described in
clause (i). 

          (b)  Notwithstanding the foregoing, UpREIT will have no obligation to
take direction from Prime in respect of a contest which could result in Prime
owing UpREIT indemnification under this Agreement (i) without Prime paying when
due, reasonable third-party costs and out-of-pocket expenses including
reasonable legal, witness and accounting fees and other expenses and, in the
case of proceedings before the Court of Federal Claims or Federal District
Court, the amount of tax (and any applicable interest and penalties) for which
refund is claimed, or  (ii) to the extent UpREIT waives in writing Prime's
obligation to indemnify UpREIT for such items, in which case all third-party
costs and out-of-pocket expenses described in clause (i) thereafter incurred and
all taxes would be paid by UpREIT.

          Section 6. TAX SAVINGS.

          (a)  In the event that Prime makes an indemnity payment pursuant to
Section 3, if UpREIT shall realize with respect to any year, any federal,
applicable state or applicable local or municipality income tax savings that
would not have been realized but for either UpREIT's receipt of such payment or
the related Indemnity Payment (which tax savings were not taken into account in
calculating Prime's indemnity payment to UpREIT), UpREIT shall pay to Prime, on
an After-Tax Basis, an amount equal to the actual net reduction in federal and
applicable state income tax actually realized by UpREIT; provided, however, that
in no event shall UpREIT be required to pay Prime more, on an aggregate basis,
than the aggregate Indemnity Payments it receives from Prime. 

          (b)  In the event that UpREIT receives a payment from a Nardi
Indemnitee in respect of a tax savings under Section 7 of the Nardi Tax
Indemnity Agreement, UpREIT shall pay to Prime such an amount.  

          (c)  Any payment due to Prime pursuant to this Section 6 shall be paid
within ten business days after UpREIT has received the corresponding payment
from a Nardi Indemnitee or Hadesman Indemnitee; PROVIDED, HOWEVER, that (i)
obligations of Prime and UpREIT under this Agreement will first be set off
against each other, and (ii) any loss of such tax savings by UPREIT subsequent
to the year of realization shall be indemnifiable pursuant to the provisions of
this Agreement. 

          Section 7.  STATE TAX.  For purposes of this Agreement, each of UpREIT
and Prime will be treated as recognizing any taxable income, realizing any
deductions, credits or other income tax benefits, having the same tax savings
and having the same tax attributes and status for applicable state income tax
purposes at the same time, in the same amount and in the same manner, as such
person does for federal income tax purposes.  

                                         -3-
<PAGE>

          Section 8.  GOVERNING LAW.  This Agreement shall be governed by and
construed in accordance with the laws of the State of Illinois.

          Section 9.  NOTICES.  All notices, demands, declarations, consents,
directions, approvals, instructions, requests and other communications required
or permitted by the terms hereof shall be given in the manner described in
Section 14.1 of the Partnership Agreement.

          Section 10.  SUCCESSORS AND ASSIGNS.  The terms of this Tax
Indemnification Agreement may not be assigned without the written consent of the
non-assigning party.

          Section 11. MISCELLANEOUS.  This Agreement may be executed in any
number of counterparts, each executed counterpart constituting an original but
all together only one Agreement.  Any provision of this Agreement which is
prohibited and unenforceable in any jurisdiction shall, as to such jurisdiction,
be ineffective to the extent of such prohibition or unenforceability without
invalidating the remaining provisions hereof, and any such prohibition or
unenforceability in any jurisdiction shall not invalidate or render
unenforceable such provision in any other jurisdiction.  Neither this Agreement
nor any of the terms hereof may be terminated, amended, supplemented, waived or
modified orally, but only by an instrument in writing signed by the party
against which the enforcement of the termination, amendment, supplement, waiver
or modification is sought.

                                         -4-
<PAGE>

          IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be duly executed by their respective Officers thereunto duly authorized as of
the day and year first above written.

                              PRIME GROUP REALTY, L.P.

                              By:  PRIME GROUP REALTY TRUST
                              Its: Managing General Partner

                              By: /s/ Richard S. Curto
                                 ---------------------------
                                    Name: Richard S. Curto
                                    Title: President and CEO


                              THE PRIME GROUP, INC.


                              By:    /s/ Michael W. Reshcke   
                                 ---------------------------------
                                    Name: Michael W. Reschke
                                    Title: Chairman of the Board


                                         -5-


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