BEACON PROPERTIES CORP
424B3, 1996-07-23
REAL ESTATE INVESTMENT TRUSTS
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                            SUBJECT TO COMPLETION 
            PRELIMINARY PROSPECTUS SUPPLEMENT DATED JULY 23, 1996 



PROSPECTUS SUPPLEMENT
- --------------------
(To Prospectus dated March 29, 1996) 

                               5,000,000 Shares 

                        BEACON PROPERTIES CORPORATION 

                                 Common Stock 

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


   Beacon Properties Corporation (collectively with its subsidiaries, the 
"Company") is a self-administered and self-managed real estate investment 
trust (a "REIT") which owns a portfolio of Class A office properties and 
other commercial properties located in major metropolitan areas, including 
Boston and Atlanta, as well as commercial real estate development, 
construction, acquisition, leasing, design and management businesses. The 
Company owns or has an interest in 58 income producing commercial properties 
encompassing approximately 10 million rentable square feet (each, a 
"Property" and collectively, the "Properties"). As of June 30, 1996, the 
Properties were approximately 96% leased with over 800 tenants. In addition, 
the Company has entered into contracts to acquire ten additional office 
buildings encompassing approximately 1.6 million additional rentable square 
feet located in Fairfax County, Virginia, Washington, D.C., and suburban 
Chicago, Illinois for an aggregate purchase price of $227 million 
(collectively, the "Pending Acquisitions"). If all of the Pending 
Acquisitions are consummated, the Company will own or have an interest in 68 
income producing commercial properties encompassing approximately 11.6 
million rentable square feet. 



   All of the shares of common stock of the Company, par value $.01 per share 
("Common Stock"), offered hereby are being sold by the Company (the 
"Offering"). Senior executive officers and Directors of the Company and 
members of their families currently own approximately $100 million of equity 
of the Company (approximately 10% of the equity upon completion of the 
Offering.) 



   The Common Stock is listed on the New York Stock Exchange (the "NYSE") 
under the symbol "BCN." On July 19, 1996, the reported closing sale price of 
the Common Stock on the NYSE was $25-7/8 per share. See "Price Range of 
Common Stock and Distribution History." 



   See "Risk Factors" beginning on page S-13 for certain factors relevant to 
an investment in the Common Stock. 


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


THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND 
  EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE 
    SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES 
       COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS 
         PROSPECTUS SUPPLEMENT OR THE PROSPECTUS. ANY REPRESENTATION 
                    TO THE CONTRARY IS A CRIMINAL OFFENSE. 



                 Price to    Underwriting     Proceeds to 
                  Public     Discount (1)     Company (2) 
Per Share            $           $               $ 
Total (3)            $           $               $ 


(1) The Company has agreed to indemnify the Underwriters against certain 
    liabilities, including liabilities under the Securities Act of 1933, as 
    amended (the "Securities Act"). See "Underwriting." 



(2) Before deducting estimated expenses of $       payable by the Company. 



(3) The Company has granted the Underwriters an option, exercisable for 30 
    days after the date of this Prospectus Supplement, to purchase up to an 
    additional 750,000 shares of Common Stock to cover over-allotments, if 
    any. If all such shares are purchased, the total Price to Public, 
    Underwriting Discount and Proceeds to Company will be $      , $ 
    and $      , respectively. See "Underwriting." 


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


 THE ATTORNEY GENERAL OF THE STATE OF NEW YORK HAS NOT PASSED ON OR ENDORSED 
 THE MERITS OF THIS OFFERING. ANY REPRESENTATION TO THE CONTRARY IS UNLAWFUL. 


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


  The shares of Common Stock are offered by the several Underwriters, subject to
prior sale, when, as and if issued to and accepted by them, subject to approval
of certain legal matters by counsel for the Underwriters. The Underwriters
reserve the right to withdraw, cancel or modify such offer and to reject orders
in whole or in part. It is expected that delivery of the Common Stock offered
hereby will be made in New York, New York, on or about        , 1996.

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


Merrill Lynch & Co. 
Dean Witter Reynolds Inc. 
Donaldson, Lufkin & Jenrette 
Securities Corporation 
Lehman Brothers 
PaineWebber Incorporated 
Raymond James & Associates, Inc. 


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

              The date of this Prospectus Supplement is , 1996. 

<PAGE>
 

  [Photos of Pending Acquisitions, location maps of Chicago area and Fairfax 
 County, Virginia area, pie charts indicating urban/suburban distribution of 
            Properties and geographic distribution of Properties] 



   IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR 
EFFECT TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE 
COMPANY'S COMMON STOCK AT LEVELS ABOVE THOSE WHICH MIGHT OTHERWISE PREVAIL IN 
THE OPEN MARKET. SUCH TRANSACTIONS MAY BE EFFECTED ON THE NEW YORK STOCK 
EXCHANGE, IN THE OVER-THE-COUNTER MARKET OR OTHERWISE. SUCH STABILIZING, IF 
COMMENCED, MAY BE DISCONTINUED AT ANY TIME. 

                                     S-2 
<PAGE>
 
                         PROSPECTUS SUPPLEMENT SUMMARY


   The following summary is qualified in its entirety by the more detailed 
information included elsewhere in this Prospectus Supplement and the 
accompanying Prospectus or incorporated herein and therein by reference. 
Unless otherwise indicated, the information contained in this Prospectus 
Supplement assumes (i) that all units of limited partnership interest in 
Beacon Properties, L.P. ("Units") redeemable for Common Stock or cash have 
been redeemed for Common Stock, (ii) that the Underwriters' over-allotment 
option is not exercised and (iii) that the market price per share of Common 
Stock is equal to $25.875 (the reported closing sale price of the Common 
Stock on the NYSE on July 19, 1996). Unless the context otherwise requires, 
all references in this Prospectus Supplement to the "Company" shall mean 
Beacon Properties Corporation, Beacon Properties, L.P. (the "Operating 
Partnership"), the entity through which the Company holds substantially all 
of its direct and indirect interests in the Properties, and their 
subsidiaries on an aggregated basis. This Prospectus Supplement contains 
forward-looking statements within the meaning of Section 27A of the 
Securities Act of 1933, as amended, and Section 21E of the Securities 
Exchange Act of 1934, as amended. The Company's actual results could differ 
materially from those set forth in the forward-looking statements. Certain 
factors that might cause such a difference are discussed in the section 
entitled "Risk Factors" starting on page S-13 of this Prospectus Supplement. 



                                 The Company 


   The Company is a self-managed and self-administered real estate investment 
trust (a "REIT") which owns a portfolio of Class A office properties and 
other commercial properties located in major metropolitan areas, including 
Boston and Atlanta, as well as commercial real estate development, 
construction, acquisition, leasing and management businesses. Class A office 
properties generally are considered to be those that have excellent locations 
and access, attract high quality tenants, are well maintained and 
professionally managed, and achieve among the highest rent, occupancy and 
tenant retention rates within their markets. The Properties comprise 
approximately 10 million rentable square feet in the aggregate and, as of 
June 30, 1996, were approximately 96% leased with over 800 tenants. 



   The Company has entered into contracts to acquire the Pending Acquisitions 
comprised of ten office buildings encompassing approximately 1.6 million 
additional rentable square feet located in Fairfax County, Virginia, 
Washington, D.C. and suburban Chicago, Illinois for an aggregate purchase 
price of $227 million. If all of the Pending Acquisitions are consummated, 
the Company will own or have an interest in 68 income producing commercial 
properties encompassing approximately 11.6 million rentable square feet and 
will have a total market capitalization of approximately $1.5 billion. 



                             Recent Developments 


Pending Acquisitions 

   As part of its ongoing business, the Company continually conducts 
strategic analyses of major office markets in the United States to determine 
those markets which warrant acquisition of office properties. The Company 
places particular emphasis on office-using employment growth as well as the 
prospects for future supply of office space in each of the markets. The 
Company has determined that, in addition to the Boston, Atlanta and 
Washington, D.C. markets in which the Company now operates, the suburban 
Chicago market, where two of the Pending Acquisitions are located, and other 
select markets, also possess attractive market fundamentals. 

   The Chicago metropolitan area, with over 50 Fortune 500 companies, is a 
major regional center with a strong infrastructure. According to the U.S. 
Bureau of Labor Statistics, the Chicago metropolitan area gained 
approximately 34,000 office-using jobs for the twelve months ended March 31, 
1996. The Company believes that several Chicago suburban office submarkets 
are attractive due to employment growth in office-using jobs, the relatively 
short time frame expected to absorb the existing supply of office space and 
low vacancy rates. The Company also believes that its development and 
management experience in the Chicago market will benefit the Company's 
expansion into this market. The Company currently manages approximately 1.3 
million square feet of office/industrial space in the Chicago area. 
Additionally, the Company's construction subsidiary has actively participated 
in several projects in the Chicago area over the past several years. 


                                     S-3 
<PAGE>
 

   The greater Washington, D.C. area, including northern Virginia, is also a 
major regional center with a strong infrastructure. According to the U.S. 
Bureau of Labor Statistics, the Washington, D.C. metropolitan area gained 
approximately 31,000 office-using jobs for the twelve months ended March 31, 
1996. The Company believes that Fairfax County, Virginia represents an 
attractive market due to its employment growth in the high technology, 
professional service and telecommunications sectors, the relatively short 
time frame expected to absorb the existing supply of office space and low 
vacancy rates. The Company also believes that its extensive development and 
management experience in the greater Washington, D.C. market will benefit its 
further acquisition of properties in this area. The Company currently manages 
approximately 1.3 million square feet in the greater Washington, D.C. area, 
including the Polk and Taylor Buildings. 

   The Company has entered into contracts to purchase the Pending 
Acquisitions for aggregate consideration of $227 million. The purchase of 
each of the Pending Acquisitions is subject to various closing conditions, 
including, but not limited to, satisfactory completion of the Company's due 
diligence, and, with respect to the Fairfax County Portfolio (as defined 
below), agreement regarding the terms of the remediation of certain 
environmental matters concerning the John Marshall III developable land. See 
"Risk Factors--Possible Environmental Liabilities." The Company currently 
expects to complete the purchase of the Pending Acquisitions during early 
September 1996. No assurances can be made that the Company will acquire any 
or all of the Pending Acquisitions. 

   In addition to the Pending Acquisitions, as part of its ongoing business, 
the Company continually engages in discussions with public and private real 
estate entities regarding possible portfolio or single asset acquisitions in 
various major metropolitan areas. No assurance can be made that the Company 
will acquire any of the property opportunities currently under review. 

   Set forth below are summary descriptions of the Pending Acquisitions. 

   New York Life Portfolio. In July 1996, the Company entered into a contract 
to acquire a portfolio of office properties, comprised of seven buildings, 
from New York Life Insurance Company (the "New York Life Portfolio") for an 
aggregate consideration of $150 million in cash. 

   The New York Life Portfolio consists of (i) the 8-story AT&T Plaza located 
in Oak Brook (suburban Chicago), Illinois built in 1984 comprising 
approximately 225,000 square feet of office space; (ii) the five-building 
Tri-State International office park located in Lincolnshire (suburban 
Chicago), Illinois built in 1986 comprising approximately 548,000 square 
feet; and (iii) an 11-story office property located at 1333 H Street in 
Washington, D.C. comprising approximately 239,000 square feet (approximately 
205,000 square feet of which was built in 1982). Major tenants in the New 
York Life Portfolio include AT&T (approximately 40,000 square feet), A.C. 
Nielsen Company (approximately 55,000 square feet) and Reuters (approximately 
55,000 square feet). The aggregate occupancy rate for the New York Life 
Portfolio as of June 30, 1996 was approximately 81%. 

   AT&T Plaza and the Tri-State International office park are located in the 
Suburban Chicago Office Market. According to Grubb & Ellis, the entire 
Suburban Chicago Office Market had an overall vacancy of 12.0% as of June 
1996, while the East-West Corridor submarket (location of AT&T Plaza) and the 
North Suburban submarket (location of the Tri-State International office 
park) had vacancy rates of 10.3% (9.2% for Class A office properties) and 
12.6% (8.2% for Class A office properties), respectively, for the same 
period. Grubb & Ellis also reports that the East-West Corridor and North 
Suburban submarkets experienced net increases in square feet of leased space 
("Net Absorption") of 730,000 square feet and 340,000 square feet, 
respectively, for the first six months of 1996. 

   Upon the acquisition of the New York Life Portfolio, the Company intends 
to establish a regional office in the Chicago area to facilitate the leasing 
and management of the properties. 

   The 1333 H Street property is located in the Washington, D.C. Office 
Market. According to Grubb & Ellis, the entire Washington, D.C. Office Market 
had an overall vacancy rate of 10.2% as of March 1996, while the East End 
submarket (location of 1333 H Street) experienced a vacancy rate of 10.1% for 
the same period. 

   The Capitalization Rate (calculated by dividing (a) the expected net 
operating income (including the effect of straight line rents) generated by 
the portfolio based upon annualized revenues from signed leases in place at 
the properties as of June 30, 1996 by (b) the consideration paid for the 
Properties) of the New York Life Portfolio acquisition is approximately 8.6%. 
In the event weighted average occupancy for the New York Life Portfolio 


                                     S-4 
<PAGE>
 

increases to 95%, the Capitalization Rate would increase to 10.8%. The 
Company expects to purchase the New York Life Portfolio for cash; 
consequently, the Returns on Equity (as defined below) for the acquisition 
are equivalent to the Capitalization Rates. No assurance can be made that the 
Company will achieve such occupancy levels or increases in returns. 

   Fairfax County Portfolio. In June 1996, the Company exercised an option to 
acquire a portfolio of three office buildings and a parcel of developable 
land located in Fairfax County, Virginia (the "Fairfax County Portfolio") for 
an aggregate consideration of $77 million. 

   The Fairfax County Portfolio consists of (i) the 11-story John Marshall I 
building located in the Tysons Corner area of McLean, Virginia, built in 1981 
comprising approximately 261,000 square feet of office space; (ii) the 11- 
story E.J. Randolph building located in the Tysons Corner area of McLean, 
Virginia, built in 1983 comprising approximately 165,000 square feet of 
office space; (iii) the 6-story Northridge I building located in 
Reston/Herndon area of Virginia, built in 1988 comprising approximately 
124,000 square feet of office space; and (iv) the John Marshall III parcel of 
developable land, with approximately 150,000 square feet of building 
capacity, located in the Tysons Corner area of McLean, Virginia. Major 
tenants in the Fairfax County Portfolio include Booz, Allen & Hamilton, Inc. 
(approximately 320,000 square feet) and Sprint Corporation (approximately 
124,000 square feet). The aggregate occupancy rate of the Fairfax County 
Portfolio as of June 30, 1996 was approximately 94%. 

   According to Grubb & Ellis, the Fairfax County, Virginia Market had an 
overall vacancy rate of 8.0% as of March 1996, and the submarkets of Tysons 
Corner and Reston/Herndon had vacancy rates of 8.2% and 5.3%, respectively, 
for the same period. Grubb & Ellis also reports that Tysons Corner and 
Reston/Herndon submarkets experienced Net Absorption of 600,000 square feet 
and 400,000 square feet, respectively, for the three months ended March 31, 
1996. 

   The Capitalization Rate of the Fairfax County Portfolio acquisition is 
approximately 11.5%. The Return on Equity invested by the Company in the 
Fairfax County Portfolio is expected to be 21.3% assuming the repayment of 
approximately $18 million of the debt assumed in connection with the 
acquisition with a draw on the Company's credit facility (the "Credit 
Facility") provided by the First National Bank of Boston ("Bank of Boston"), 
as agent. Return on Equity is calculated by dividing (a) the expected net 
operating income (including the effect of straight line rents) generated by 
the portfolio based upon annualized revenues from signed leases in place at 
the properties as of June 30, 1996 less expected debt service on the 
principal amount of the mortgage debt and the Credit Facility debt that will 
encumber the properties upon completion of the acquisition by (b) the 
consideration paid for the properties less the principal amount of the 
mortgage debt and the Credit Facility debt that will encumber the properties 
upon completion of the acquisition. 

   The blended Capitalization Rate on both the New York Life Portfolio and 
the Fairfax County Portfolio acquisitions is 9.6%. In the event weighted 
average occupancy for the New York Life Portfolio increases to 95%, the 
blended Capitalization Rate for the acquisitions would be 11.1%. No 
assurances can be made that the Company will achieve such occupancy levels or 
increases in returns. 

   The Company intends to finance the New York Life Portfolio and the Fairfax 
County Portfolio acquisitions with the proceeds of this Offering and cash 
and, with respect to the Fairfax County Portfolio, the assumption of $55.4 
million of mortgage debt secured by the properties ($18 million of which will 
be repaid with a draw on the Credit Facility) and the issuance of 839,223 
Units. The blended Return on Equity invested by the Company in both the New 
York Life Portfolio and the Fairfax County Portfolio is expected to be 10.2% 
or, assuming the weighted average occupancy for the New York Life Portfolio 
increases to 95%, 12.1%. No assurances can be made that the Company will 
achieve such occupancy levels or increases in returns. 

Activities Relating to the Perimeter Center Portfolio 

   In February 1996, the Company purchased an approximately 3.3 million 
square foot portfolio comprised of 32 buildings located in Perimeter Center 
(suburban Atlanta), Georgia (the "Perimeter Center Portfolio"), associated 
ground leases, and rights and options to purchase adjoining land for 
approximately $336 million (excluding associated acquisition-related 
expenses). In March 1996, Metropolitan Life Insurance Company ("MetLife") 


                                     S-5 
<PAGE>
 

provided $218 million of mortgage financing on the Perimeter Center Portfolio 
(the "MetLife Loan") to the Company. The MetLife Loan bears interest at a 
rate of 7.08% fixed over the ten year term of the loan. As of June 30, 1996, 
the aggregate occupancy rate of the Perimeter Center Portfolio was 
approximately 97%, an increase from an aggregate occupancy rate of 94% as of 
December 31, 1995. As a result of the closing of the Met Life Loan and the 
increased occupancy at the Property, the Capitalization Rate of the Perimeter 
Center Portfolio is approximately 11.4% and the Return on Equity invested by 
the Company in the Property is approximately 19.4%. 

Financing Activities 

   In June 1996, the Company substantially modified the terms of the Credit 
Facility. Additionally, in July 1996, the maximum loan amount available under 
the Credit Facility was increased to $300 million. The Credit Facility 
matures in June 1999. Outstanding balances under the Credit Facility bear 
interest, at the Company's option, at either (i) the higher of (x) Bank of 
Boston's base interest rate and (y) one-half of one percent (1/2%) above the 
overnight federal funds effective rate or (ii) the Eurodollar rate plus 175 
basis points. Following the closing of this Offering and the acquisition of 
the Pending Acquisitions, the Company will have available approximately $210 
million of borrowing capacity under the Credit Facility, of which 
approximately $18 million will be outstanding. In order to increase the 
borrowing capacity to the maximum $300 million, the Company anticipates that 
it will be required to grant mortgages on additional properties. 



Increase in Distributions 


   In July 1996, the Company announced an increase in its quarterly 
distribution of 10.1%, increasing the quarterly distribution on its Common 
Stock from $.42 per share to $.4625 per share, which, on an annualized basis, 
is equal to an annual distribution of $1.85 per share of Common Stock. The 
higher distribution rate commenced with the Company's distribution with 
respect to the second quarter of 1996, to be paid on August 23, 1996, to 
stockholders of record as of August 14, 1996. Accordingly, it is currently 
expected that purchasers of Common Stock in the Offering who hold Common 
Stock as of the record date will receive the second quarter 1996 distribution 
in respect of the shares of Common Stock offered hereby. 

Other Developments 

   Rowes Wharf Mortgage Debt. In connection with its initial public offering 
in May 1994 (the "Initial Offering"), the Company acquired a 45% indirect 
limited partner interest in Rowes Wharf Associates, the entity that owns the 
hotel space and leases the office and retail space at the Rowes Wharf 
Property. During the period from April 1995 through June 1996, the Company 
(together with an affiliate) and the Equitable Life Assurance Society of the 
United States, on behalf of its Prime Property Fund ("Equitable"), the 
Company's joint venture partner in the Rowes Wharf Property, acquired all of 
the outstanding mortgage debt on the Rowes Wharf Property. The mortgage debt 
was purchased at approximately 50% of face value. See "Properties and Pending 
Acquisitions--Mortgage Indebtedness and Credit Facility." 

   Crosby Corporate Center. The Company has substantially completed a $16 
million redevelopment of Crosby Corporate Center, repositioning the Property 
from research/development space to a Class A suburban office park. As of June 
30, 1996, Crosby Corporate Center was approximately 88% leased. Additionally, 
the Company has entered into an agreement to acquire a 29-acre parcel of land 
adjacent to the Crosby Corporate Center. This parcel will support 
approximately 250,000 square feet of buildings and the Company expects that 
development of a significant portion of the land could commence in early 
1997, although no assurances can be made in this regard. The Company believes 
that demand for office space in the greater Boston Suburban Office Market 
(the location of the Crosby Corporate Center) will continue as several major 
tenants at the Property experience substantial growth. No assurance can be 
made that such increased demand will occur. 


                                     S-6 
<PAGE>
 
Risk Factors 

   An investment in the Common Stock involves various risks and prospective 
investors should carefully consider the matters discussed under "Risk 
Factors" prior to any investment in the Company. Such risks include, among 
others: 


   (bullet) Risks associated with the addition of a substantial number of new 
properties to the Company's portfolio; 

   (bullet) Risks associated with borrowing, such as the possibility that (i) 
the Company will not have sufficient funds available to make principal 
payments on outstanding debt; (ii) outstanding indebtedness will be 
refinanced at higher interest rates or otherwise on terms less favorable to 
the Company; and (iii) interest rates under the Credit Facility will 
increase, all of which could adversely affect the Company's ability to make 
expected distributions to stockholders and its ability to qualify as a REIT; 

   (bullet) Risks associated with a Debt to Market Capitalization (as defined 
herein) following the Offering of approximately 36.3%; 

   (bullet) The limited geographic diversification of the Properties and the 
Company's reliance upon the continued demand for office and other commercial 
space in the greater Boston and Atlanta metropolitan office properties 
markets; 

   (bullet) Risks associated with the joint ownership of properties through 
entities in which the Company does not have sole control over the property; 


   (bullet) Possible adverse consequences of limiting ownership of Common 
Stock by a single person to 6.0%, or 9.9% for certain stockholders, of the 
outstanding Common Stock; 

   (bullet) Risks associated with the acquisition, development and 
construction of office and other commercial properties; 


   (bullet) Real estate investment considerations, such as the effect of 
economic and other conditions in the market area on property cash flows and 
values, the need to renew leases or relet space upon the expiration of 
current leases, the ability of a property to generate revenues sufficient to 
meet debt service payments and other operating expenses, and the illiquidity 
of real estate investments, all of which may affect the Company's ability to 
make expected distributions; 


   (bullet) Risks associated with investments in mortgage indebtedness, 
including the risk that a debtor may file for bankruptcy or otherwise be 
unable or refuse to make payments under the mortgage; 

   (bullet) Potential liability of the Company for environmental liabilities 
either as an owner or as an operator of properties; 


   (bullet) Risks associated with ownership of subsidiary corporations, 
including potential tax liabilities, lack of control over such subsidiaries 
and possible adverse consequences of REIT status on the business of 
subsidiaries; 

   (bullet) Risks associated with the management of properties that are not 
controlled by the Company and properties owned by third parties; and 

   (bullet) Possible increases in market interest rates, which lead 
prospective purchasers of Common Stock to demand a higher anticipated annual 
yield from future dividends, which in turn may adversely affect the market 
price of Common Stock. 


                                     S-7 
<PAGE>
 

                   The Properties and Pending Acquisitions 

   Set forth below are summary descriptions of the Properties and the Pending 
Acquisitions. 

<TABLE>
<CAPTION>
                                          Year     Ownership                         Rentable     Percent Leased 
                                         Built/     Interest     Property             Area in       at June 30, 
              Property                 Renovated       (1)       Location           Square Feet        1996 
- -----------------------------------     ---------    --------   ----------          -----------   -------------- 
<S>                                    <C>            <C>       <C>                   <C>           <C>
Properties: 
Downtown Boston Office Market: 
75-101 Federal Street                  1985-1988      51.6%     Boston, MA               812,000        94%
One Post Office Square                      1981        50%     Boston, MA               764,129        99%
Center Plaza                           1966-1969        (2)     Boston, MA               649,359        93%
150 Federal Street                          1988       100%     Boston, MA               530,279       100%
Rowes Wharf                                 1987        45%     Boston, MA               344,326        99%
Russia Wharf                           1978-1982       100%     Boston, MA               314,596       100%
2 Oliver Street-147 Milk Street        1982-1988       100%     Boston, MA               271,000        95%
175 Federal Street                          1977       100%     Boston, MA               203,349        89%
South Station (3)                           1988       100%     Boston, MA               148,591       100%
                                                                                      ----------      -----
                                                                                       4,037,629        96%
                                                                                      ----------      -----
North Central Atlanta Office 
  Market: 
Perimeter Center Portfolio (4)         1970-1989       100%     Atlanta, GA            3,302,136        97%
                                                                                      ----------      -----
Greater Boston Suburban Office 
  Market: 
Wellesley Office Park (5)              1963-1984       100%     Wellesley, MA            599,334        90%
Crosby Corporate Center                     1996       100%     Bedford, MA              336,000        88%
Westwood Business Centre                    1985       100%     Westwood, MA             160,400        99%
                                                                                      ---------- 
                                                                                       1,095,734        91%
                                                                                      ----------      -----
Cambridge Office Market: 
One Canal Park                              1987       100%     Cambridge, MA            100,300        94%
Ten Canal Park                              1987       100%     Cambridge, MA            110,000        88%
                                                                                      ---------- 
                                                                                         210,300        91%
                                                                                      ----------      -----
Suburban Philadelphia Office 
  Market: 
Westlakes Office Park (6)              1988-1990       100%     Berwyn, PA               443,592        94%
                                                                                      ----------      -----
Arlington County, Virginia Office 
  Market: 
The Polk and Taylor Buildings               1970        10%     Arlington, VA            890,000       100%
                                                                                      ----------      -----
    Total Weighted Average 
      Properties                                                                       9,979,391        96%
                                                                                      ==========      =====
Pending Acquisitions: 
New York Life Portfolio: 
AT&T Plaza                                  1984       100%     Oakbrook, IL             225,318       100%
Tri-State International (7)                 1986       100%     Lincolnshire, IL         548,000        68%
1333 H Street                               1982(8)    100%     Washington, D.C.         238,694        92%
                                                                                      ----------      -----
                                                                                       1,012,012        81%
                                                                                      ----------      -----
Fairfax County Portfolio: 
John Marshall I                             1981       100%     McLean, VA               261,364       100%
E.J. Randolph                               1983       100%     McLean, VA               164,677        80%
Northridge I                                1988       100%     Reston/Herndon, VA       124,319       100%
                                                                                      ----------      -----
                                                                                         550,360        94%
                                                                                      ----------      -----
    Total Weighted Average 
      Pending Acquisitions                                                             1,562,372        85%
                                                                                      ==========      =====
    Total Weighted Average 
      Properties and Pending 
      Acquisitions                                                                    11,541,763        95%
                                                                                      ==========      =====
</TABLE>


                                     S-8 
<PAGE>

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


(1) The Company holds a general partner interest in One Post Office Square, a 
    general partner and limited partner interest in Center Plaza and the Polk 
    and Taylor Buildings and an indirect limited partner interest in Rowes 
    Wharf Associates. The Company holds approximately 51.6% of the common 
    stock of BeaMetFed, Inc. ("BeaMetFed"), the entity that holds the fee 
    title to the 75-101 Federal Street Property. The Company owns a 100% fee 
    interest in the remaining Properties, with the exception of South 
    Station, in which the Company holds a ground leasehold interest. Upon the 
    consummation of the Pending Acquisitions, the Company will hold a 100% 
    fee interest in each of the Pending Acquisitions. 


(2) The Company holds a 1% general partner interest, a 75% limited partner 
    interest and an option to purchase the remaining 24% limited partner 
    interest in the partnership that owns the Center Plaza Property. 

(3) The Company owns a ground leasehold interest in the South Station 
    Property which expires in 2024 but may be extended, at the Company's 
    option, for two additional 15-year terms. Fee title to this Property is 
    owned by an unaffiliated third party. This Property was originally built 
    in the early 1900s and was fully rehabilitated in 1988. This Property 
    includes a significant retail component. 

(4) The Perimeter Center Portfolio consists of 32 buildings and six ground 
    leases. 

(5) The Wellesley Office Park consists of eight office buildings. 


(6) The Westlakes Office Park consists of four office buildings. 

(7) The Tri-State International Office Park consists of five office 
    buildings. 

(8) Approximately 205,000 square feet of the 1333 H Street property was built 
    in 1982. The remaining approximately 34,000 square feet was renovated in 
    1982. 


                                     S-9 
<PAGE>

                                  The Offering

   All of the shares of Common Stock offered hereby are being sold by the 
Company. None of the Company's stockholders are selling any Common Stock in 
the Offering. 


<TABLE>
<S>                                                   <C>
Common Stock Offered                                  5,000,000 
Common Stock Outstanding After the Offering (1)       37,476,094 
Use of Proceeds                                       To purchase the New York Life Portfolio and/or 
                                                      for general corporate and working capital 
                                                      purposes. 
NYSE Symbol                                           "BCN" 
</TABLE>


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


(1) Includes 5,107,831 shares of Common Stock that may be issued upon 
    redemption of Units (which are redeemable by the holders for cash or, at 
    the election of the Company, shares of Common Stock on a one- for-one 
    basis), including 839,223 Units to be issued in connection with the 
    acquisition of the Fairfax County Portfolio. Excludes 3,129,310 shares of 
    Common Stock reserved for issuance pursuant to the Company's 1994 Stock 
    Option Plan and dividend reinvestment plan. 



                                Distributions 


   In July 1996, the Company announced an increase in its quarterly 
distribution of 10.1%, increasing the quarterly distribution on its Common 
Stock from $.42 per share to $.4625 per share, which, on an annualized basis, 
is equal to an annual distribution of $1.85 per share of Common Stock. Future 
distributions by the Company will be at the discretion of the Board of 
Directors and there can be no assurance that any such distributions will be 
made by the Company. Distributions by the Company to the extent of its 
current and accumulated earnings and profits for Federal income tax purposes 
generally will be taxable to stockholders as ordinary dividend income. 
Distributions in excess of current and accumulated earnings and profits will 
be treated as a non-taxable reduction of the stockholder's basis in its 
shares of Common Stock to the extent thereof, and thereafter as taxable gain. 
Distributions that are treated as a reduction of the stockholder's basis in 
its shares of Common Stock will have the effect of deferring taxation until 
the sale of the stockholder's shares. 

                    Summary Selected Financial Information 

   The following table sets forth selected financial and operating 
information on an as adjusted basis for the Company and on a combined 
historical basis for the Company and The Beacon Group, the predecessor entity 
to the Company (the "Predecessor"). The consolidated results of operations of 
the Company for the six months ended June 30, 1996 and 1995 have been derived 
from unaudited financial statements. The consolidated results of operations 
of the Company for the year ended December 31, 1995 and for the period May 
26, 1994 to December 31, 1994, the combined results of operations of the 
Predecessor for the period January 1, 1994 to May 25, 1994 and the combined 
historical operating information of the Predecessor for the years ended 
December 31, 1993, 1992 and 1991 have been derived from the financial 
statements audited by Coopers & Lybrand L.L.P., independent accountants. 

   The unaudited selected pro forma financial and operating information is 
presented as if the Offering, the acquisition of the Properties acquired 
since January 1, 1995, the acquisition of the Pending Acquisitions and 
related assumption of debt had occurred as of January 1, 1995, for the 
condensed consolidated statement of operations. The pro forma financial 
information is not necessarily indicative of what the results of operations 
of the Company would have been for the periods indicated, nor does it purport 
to represent the Company's future results of operations. 


                                     S-10 
<PAGE>
 

<TABLE>
<CAPTION>


                                                                           Company 
                                      --------------------------------------------------------------------------------------------
                                        Pro Forma
                                        Six Months       Six Months     Six Months                  For the Year    For the Period
                                           Ended           Ended           Ended          Pro           Ended       May 26, 1994 to
                                       June 30, 1996   June 30, 1996   June 30, 1995   Forma 1995    December 31,     December 31,
                                        (unaudited)     (unaudited)     (unaudited)    (unaudited)       1995            1994 
                                       -------------   -------------   -------------   ----------    ------------     ------------
                                                             (dollars in thousands, except per share amounts) 
<S>                                   <C>             <C>              <C>           <C>            <C>              <C>         
OPERATING INFORMATION: 
Revenue: 
 Rental income                        $    81,335     $    60,051      $    34,093   $   159,129    $    71,050      $    25,144 
 Management fees                            1,517           1,517              936         2,926          2,203               -- 
 Recoveries from tenants                   10,088           6,782            4,813        19,487          9,742            4,488 
 Mortgage interest income                   2,776           2,165              611         5,573          2,546               -- 
 Interest and other income                  5,472           4,591            2,472         7,501          5,502            2,301 
                                          --------        --------        --------        -----        ------          --------- 
   Total revenue                          101,188          75,106           42,925       194,616         91,043           31,933 
                                          --------        --------        --------        -----        ------          --------- 
Expenses:
Property expenses                          20,138          14,770            8,531        39,511         18,090            7,034 
Real estate taxes                           9,768           7,831            4,901        17,953         10,217            3,325 
General and administrative                  8,574           7,362            4,570        13,986          9,755            3,122 
Mortgage interest expense                  16,805          13,661            7,977        33,315         15,226            4,992 
Interest--amortization of financing
  costs                                     1,199           1,184              576         1,490          1,370              617 
Depreciation and amortization              17,947          13,346            8,252        34,856         17,428            6,924 
                                          --------        --------        --------        -----        ------          --------- 
   Total expenses                          74,431          58,154           34,807       141,110         72,086           26,014 
                                          --------        --------        --------        -----        ------          --------- 
Income (loss) from operations              26,757          16,952            8,118        53,506         18,957            5,919 
                                          --------        --------        --------        -----        ------          --------- 
Construction revenue and other
  income                                       --              --               --             --         --                 -- 
Construction costs and operating
  expenses                                     --              --               --             --         --                 -- 
                                          --------        --------        --------        -----        ------          --------- 
Income from construction                       --              --               --             --         --                 -- 
                                          --------        --------        --------        -----        ------          --------- 
Equity (loss) in joint ventures and
  corporations (1)                          1,582           1,582            1,065         4,560          3,222            1,406 
Minority interest in loss of
  combined partnerships                        --              --               --             --         --                 -- 
                                          --------        --------        --------        -----        ------          --------- 
Income (loss) before extraordinary
  items                                    28,339          18,534            9,183        58,066         22,179            7,325 
Extraordinary items, net of minority
  interest                                     --          (3,309)              --            --         --                   -- 
Minority interest in Operating
  Partnership                              (3,862)         (2,681)          (1,951)       (7,914)        (4,119)          (1,670) 
                                          --------        --------        --------        -----        ------          --------- 
Net income (loss) (2)                                 $    12,544      $     7,232                  $    18,060      $     5,655 
                                                                                                       ======          ========= 
Net income before extraordinary
  item (2)                            $    24,476                                    $    50,152
                                          ========                                         =====
Net income per share before
  extraordinary items                         .76     $       .64                           1.55
Net income per share of Common Stock                  $       .51      $       .51                  $      1.09      $      0.48 
Cash dividends declared per share of
  Common Stock                        $        --     $       .88      $       .82            --    $      1.24      $      0.96 
Cash dividends paid per share of
  Common Stock                        $        --     $       .84      $       .80   $        --    $      1.64      $      0.56 
Weighted average common shares
  outstanding                          32,368,263      24,682,042       14,085,977    32,368,263     16,525,245       11,816,380 
</TABLE>


<TABLE>
<CAPTION>
                                                           Predecessor 
                                       --------------------------------------------------
                                       For the Period
                                          January 1, 
                                           1994 to           Years Ended December 31, 
                                           May 25,      ---------------------------------
                                            1994          1993          1992       1991
                                       --------------   --------      --------   --------
                                         (dollars in thousands, except per share amounts)
<S>                                      <C>           <C>           <C>         <C>      
OPERATING INFORMATION: 
Revenue: 
 Rental income                           $  5,776      $ 14,315      $ 11,406    $ 14,850 
 Management fees                            1,521         3,533         3,331       2,205 
 Recoveries from tenants                    1,040         2,349         1,989       3,986 
 Mortgage interest income                      --            --            --          -- 
 Interest and other income                    675         2,176         2,003       3,134 
                                          --------      --------      --------      ----- 
   Total revenue                            9,012        22,373        18,729      24,175 
                                          --------      --------      --------      ----- 
Expenses: 
Property expenses                           2,086         4,580         4,522       6,390 
Real estate taxes                             595         1,354         1,204       1,162 
General and administrative                  1,399         4,357         4,658       4,528 
Mortgage interest expense                   2,798         7,650         7,203       7,532 
Interest--amortization of financing 
  costs                                       373           192           138         320 
Depreciation and amortization               2,385         5,577         5,505       4,967 
                                          --------      --------      --------      ----- 
   Total expenses                           9,636        23,710        23,230      24,899 
                                          --------      --------      --------      ----- 
Income (loss) from operations                (624)       (1,337)       (4,501)       (724) 
                                          --------      --------      --------      ----- 
Construction revenue and other 
  income                                   24,238        72,197        52,256      39,749 
Construction costs and operating 
  expenses                                 24,136        71,757        52,120      39,679 
                                          --------      --------      --------      ----- 
Income from construction                      102           440           136          70 
                                          --------      --------      --------      ----- 
Equity (loss) in joint ventures and 
  corporations (1)                            198        (5,953)       (1,544)         84 
Minority interest in loss of 
  combined partnerships                       931         1,539         2,656       1,087 
                                          --------      --------      --------      ----- 
Income (loss) before extraordinary 
  items                                       607        (5,311)       (3,253)        517 
Extraordinary items, net of minority 
  interest                                  8,898         1,554            --          -- 
Minority interest in Operating 
  Partnership                                  --            --            --          -- 
                                          --------      --------      --------      ----- 
Net income (loss) (2)                    $  9,505      $ (3,757)     $ (3,253)   $    517 
                                          ========      ========      ========      ===== 
Net income before extraordinary item 
  (2) 

Net income per share before 
  extraordinary items 
Net income per share of Common Stock           --            --            --          -- 
Cash dividends declared per share of 
  Common Stock                                 --            --            --          -- 
Cash dividends paid per share of 
  Common Stock 
Weighted average common shares 
  outstanding                                  --            --            --          -- 
</TABLE>




                                      S-11
<PAGE>
 

<TABLE>
<CAPTION>


                                                                           Company 
                                      --------------------------------------------------------------------------------------------
                                        Pro Forma
                                        Six Months       Six Months     Six Months                  For the Year    For the Period
                                           Ended           Ended           Ended          Pro           Ended       May 26, 1994 to
                                       June 30, 1996   June 30, 1996   June 30, 1995   Forma 1995    December 31,     December 31,
                                        (unaudited)     (unaudited)     (unaudited)    (unaudited)       1995            1994 
                                       -------------   -------------   -------------   ----------    ------------     ------------
                                                             (dollars in thousands, except per share amounts) 
<S>                                   <C>             <C>              <C>           <C>            <C>              <C>         
BALANCE SHEET
   INFORMATION:
Real estate before accumulated
  depreciation                        $ 1,051,924     $   824,924      $   415,654   $        --    $   471,142      $   400,419 
Total assets                            1,126,450         927,837          433,648            --        534,797          400,861 
Mortgage debt                             440,592         403,218           89,641            --         70,536           90,936 
Note Payable, Credit Facility              18,016              --           98,300            --        130,500          130,300 
Total liabilities                         507,246         451,856          220,749            --        239,013          261,100 
Total equity (deficit)                    548,543         426,930          174,923            --        258,822          102,038 
- ------------- 
(1) Including deductions for: 
       Depreciation and
        amortization                  $     1,994     $     1,994      $       832   $     3,895    $     2,306      $     3,013
       Interest--Amortization of 
        financing costs                       448             448      $       420   $       896    $       853      $       796
(2) Company share of Operating
      Partnership                            86.4%           85.5%            78.7%         86.4%          81.3%            77.2% 
</TABLE>





<TABLE>
<CAPTION>
                                                           Predecessor 
                                       --------------------------------------------------
                                       For the Period
                                          January 1, 
                                           1994 to           Years Ended December 31, 
                                           May 25,      ---------------------------------
                                            1994          1993          1992       1991
                                       --------------   --------      --------   --------
                                         (dollars in thousands, except per share amounts)
<S>                                      <C>           <C>           <C>         <C>      
BALANCE SHEET
   INFORMATION: 
Real estate before accumulated
  depreciation                           $ 82,198      $ 81,220      $ 78,580    $ 76,489 
Total assets                               77,470        85,497        93,327      84,978 
Mortgage debt                              69,240        87,091        86,610      85,189 
Note Payable, Credit Facility                  --            --            --          -- 
Total liabilities                         129,836       143,451       142,015     127,283 
Total equity (deficit)                    (52,366)      (57,954)      (48,688)    (42,305) 
- ------------- 
(1) Including deductions for: 
       Depreciation and
        amortization 
       Interest--Amortization of 
        financing costs 
(2) Company share of Operating 
      Partnership 
</TABLE>


                                      S-12
<PAGE>
 
                                  RISK FACTORS


   An investment in the Common Stock involves various risks. Prospective 
investors should carefully consider the following information in conjunction 
with the other information contained in this Prospectus Supplement before 
purchasing Common Stock in the Offering. 

Risks Associated with the Addition of a Substantial Number of New Properties 

   The Company is currently experiencing a period of rapid growth. Since 
August 1995, the Company has invested approximately $417 million, increasing 
its interests in real estate by over 92%. Upon the completion of the Pending 
Acquisitions, the Company will have invested approximately $644 million since 
August 1995, increasing its interests in real estate by over 142%. The 
Company's ability to manage its growth effectively will require it to 
successfully apply its experience in managing its existing portfolio in new 
markets and to an increased number of properties. There can be no assurance 
that the Company will be able to manage these operations effectively. 


Real Estate Financing Risks 

   Debt Financing and Existing Debt Maturities. The Company intends to 
finance the acquisition of additional properties through the use of debt and 
equity financing. The Company is subject to the risks normally associated 
with debt financing, including the risk that the Company's cash flow will be 
insufficient to meet required payments of principal and interest, the risk 
that existing indebtedness on the Properties (which in most cases will not 
have been fully amortized at maturity) will not be able to be refinanced or 
that the terms of such refinancing will not be as favorable as the terms of 
the existing indebtedness. 

   Currently, the Company's total consolidated debt is approximately $403.1 
million, and its total consolidated debt plus its proportionate share of 
total unconsolidated debt (other than Rowes Wharf) is approximately $496.4 
million. The Company (together with an affiliate), and Equitable, the 
Company's joint venture partner in Rowes Wharf Associates, each hold one-half 
of the mortgage debt on the Rowes Wharf Property. See "Properties--Mortgage 
Indebtedness and Credit Facility." The Company's current indebtedness of 
approximately $496.4 million has maturities ranging from 1998 through 2006 
and is secured by Properties. The Company currently has no balance 
outstanding under its Credit Facility. The Company's proportionate share of 
its current total unconsolidated debt (excluding Rowes Wharf) consists of 
approximately $46.9 million on the One Post Office Square Property (in which 
the Company has a 50% general partner interest) and approximately $46.4 
million on the 75-101 Federal Street Property (in which the Company owns 
approximately 51.6% of the common stock of a private REIT that owns the 
Property). 


   The Company currently has a policy of incurring debt only if upon such 
incurrence the Company's Debt to Market Capitalization Ratio (as defined 
below) would be 50% or less. For purposes of this policy, the Company's Debt 
to Market Capitalization Ratio is calculated as the Company's proportionate 
share of total consolidated and unconsolidated debt (excluding Rowes Wharf) 
as a percentage of the sum of the market value of outstanding shares of stock 
of the Company and Units plus the Company's proportionate share of total 
consolidated and unconsolidated debt (excluding Rowes Wharf). As noted, the 
Company (together with an affiliate) currently holds one-half of the Rowes 
Wharf mortgage indebtedness. Upon completion of the Offering and the Pending 
Acquisitions, the Company's Debt to Market Capitalization Ratio will be 
approximately 36.3%. Although the Company has adopted a Debt to Market 
Capitalization Ratio policy, the organizational documents of the Company do 
not contain any limitation on the amount of indebtedness the Company may 
incur. Accordingly, the Board of Directors could alter or eliminate this 
policy and would do so, for example, if it were necessary in order for the 
Company to continue to qualify as a REIT. 


   The Company anticipates that only a small portion of the principal of the 
Company's mortgage indebtedness will be repaid prior to maturity. However, 
the Company may not have funds sufficient to repay such indebtedness at 
maturity and it may be necessary for the Company to refinance indebtedness 
through additional debt financing or equity offerings. If the Company is 
unable to refinance this indebtedness on acceptable terms, the Company may be 
forced to dispose of Properties upon disadvantageous terms, which could 
result in losses to the Company and adversely affect the amount of cash 
available for distribution to stockholders. If prevailing interest rates or 
other factors result in higher interest rates at a time when the Company must 
refinance its indebtedness, the Company's interest expense would increase, 
which would adversely affect the Company's results of operations and its 
ability to pay expected distributions to stockholders. Further, if a Property 
or Properties are mortgaged to secure payment 

                                     S-13 
<PAGE>
 
of indebtedness and the Company is unable to meet mortgage payments, the 
Property or Properties could be foreclosed upon by or otherwise transferred 
to the mortgagee with a consequent loss of income and asset value to the 
Company. Even with respect to nonrecourse indebtedness, the lender may have 
the right to recover deficiencies from the Company in certain circumstances, 
including cases of fraud and environmental liabilities. See 
"Properties--Mortgage Indebtedness and Credit Facility." 

   Risk of Rising Interest Rates. Outstanding advances under the Credit 
Facility bear interest at a variable rate. In addition, the Company may incur 
indebtedness in the future that also bears interest at a variable rate. 
Accordingly, increases in interest rates could increase the Company's 
interest expense, which could adversely affect the Company's results of 
operations and its ability to pay expected distributions to stockholders or 
cause the Company to be in default under certain Credit Facility covenants. 


Limited Geographic Diversification 

   Upon completion of the Pending Acquisitions, approximately 45% and 34% of 
the Company's proportionate share of the rentable square feet of the 
Properties is located in the greater Boston metropolitan area and the North 
Central Atlanta Office Market, respectively. Consequently, the Company will 
continue to rely upon the demand for office and other commercial space in the 
greater Boston and Atlanta metropolitan areas. Although the Boston and 
Atlanta areas continue to recover from a severe economic downturn in real 
estate markets that occurred in the late 1980s and early 1990s, there can be 
no assurance that economic conditions in the Boston and Atlanta areas will 
continue to improve. 

Risks Involved in Joint Ownership of Properties 

   The Company holds (i) a 76% general and limited partner interest in the 
property partnership that owns the Center Plaza Property, (ii) a 50% general 
partner interest in the property partnership that owns the One Post Office 
Square Property, (iii) a 90% limited partner interest (through Beacon 
Property Management Corporation and Beacon Construction Company, Inc.) in 
Rowes Wharf Limited Partnership, a limited partnership that owns a 50% 
general partner interest in Rowes Wharf Associates, the entity that owns the 
hotel space and leases the office and retail space at the Rowes Wharf 
Property, (iv) a 10% general and limited partner interest in the property 
partnership that owns the Polk and Taylor Buildings Property and (v) 
approximately 51.6% of the common stock of a private REIT which holds a 
direct fee interest in the 75-101 Federal Street Property. The Company is not 
in a position to exercise sole decision making authority regarding One Post 
Office Square, Rowes Wharf, the Polk and Taylor Buildings or 75-101 Federal 
Street. However, the Company is responsible for the day-to-day affairs of 
each such Property. 

   Joint ownership of Properties may, under certain circumstances, involve 
risks not otherwise present, including the possibility that the Company's 
partners or co-investors might become bankrupt, that such partners or co- 
investors might at any time have economic or other business interests or 
goals that are inconsistent with the business interests or goals of the 
Company, and that such partners or co-investors may be in a position to take 
action contrary to the instructions or the requests of the Company or 
contrary to the Company's policies or objectives, including the Company's 
policy with respect to maintaining its qualification as a REIT. Such 
investments may also have the potential risk of impasse on decisions, such as 
a sale, because neither the Company nor the partners or co-investors would 
have full control over the entity owning the Property. Consequently, actions 
by such partners or co-investors might result in subjecting jointly-owned 
Properties to additional risk. The Company will, however, seek to maintain 
sufficient control of the entities holding jointly-owned Properties to permit 
the Company's business objectives to be achieved. Any capital contribution by 
the Company or the Operating Partnership to the property partnerships that 
own (directly or indirectly) the Rowes Wharf and Center Plaza Properties 
requires the approval of the Directors of the Company who are neither 
officers of the Company nor affiliated with Beacon. There is no limitation 
under the Company's organizational documents as to the amount of available 
funds that may be invested in partnerships, joint ventures or co-investments. 


Possible Adverse Consequences of Limits on Ownership of Common Stock 

   In order to maintain its qualification as a REIT, not more than 50% in 
value of the outstanding capital stock of the Company may be owned, directly 
or indirectly, by five or fewer individuals (as defined in the Internal 
Revenue Code of 1986, as amended (the "Code"), to include certain entities) 
during the last half of a taxable year (other than the first year) (the "Five 
or Fewer Requirement"). In order to protect the Company against the risk of 
losing REIT status due to a concentration of ownership among its 
stockholders, the Articles of Incorporation of the 

                                     S-14 
<PAGE>
 
Company limit ownership of the issued and outstanding Common Stock by any 
single stockholder to 6.0% of the aggregate value of the Company's shares of 
capital stock from time to time; provided, however, that entities whose 
ownership of Common Stock is attributed to the beneficial owners of such 
entities for purposes of the Five or Fewer Requirement, such as pension 
trusts qualifying under Section 401(a) of the Code, United States investment 
companies registered under the Investment Company Act of 1940, as amended, 
partnerships, trusts and corporations, will be limited by the Company's 
Articles of Incorporation to holding no more than 9.9% of the aggregate value 
of the Company's shares of capital stock. The Articles of Incorporation 
provide that the Board of Directors can waive this restriction if it is 
satisfied, based upon the advice of tax counsel, that ownership in excess of 
this limit will not jeopardize the Company's status as a REIT and the Board 
of Directors otherwise decides such action would be in the best interests of 
the Company. A transfer of shares to a person who, as a result of the 
transfer, violates the ownership limitations will be void. Shares acquired or 
transferred in breach of the ownership limitations will be automatically 
converted into shares not entitled to vote or to participate in dividends or 
other distributions. In addition, shares acquired or transferred in breach of 
the ownership limitations may be purchased by the Company for the lesser of 
the price paid and the average closing price for the ten trading days 
immediately preceding redemption. 

Risks of Acquisition, Development and Construction Activities 

   The Company intends to acquire existing office and commercial properties 
to the extent that they can be acquired on advantageous terms and meet the 
Company's investment criteria. In light of current conditions in the 
Company's target market areas, the Company anticipates that in the near 
future additional properties will be added to the Company's portfolio through 
acquisitions rather than new development and construction. Acquisitions of 
commercial properties entail general investment risks associated with any 
real estate investment, including the risk that investments will fail to 
perform as expected or that estimates of the cost of improvements to bring an 
acquired property up to standards established for the intended market 
position may prove inaccurate. 

   The Company also intends to continue the development and construction of 
office and other commercial properties, in accordance with the Company's 
development and underwriting policies as opportunities arise in the future. 
Risks associated with the Company's development and construction activities 
include the risk that: the Company may abandon development opportunities 
after expending resources to determine feasibility; construction costs of a 
project may exceed original estimates; occupancy rates and rents at a newly 
completed property may not be sufficient to make the properties profitable; 
financing may not be available on favorable terms for development of a 
property; and construction and lease-up may not be completed on schedule, 
resulting in increased debt service expense and construction costs. 
Development activities are also subject to risks relating to the inability to 
obtain, or delays in obtaining, all necessary zoning, land-use, building, 
occupancy, and other required governmental permits and authorizations. If any 
of the foregoing occurs, the Company's ability to make expected distributions 
to stockholders could be adversely affected. In addition, new development 
activities, regardless of whether or not they are ultimately successful, 
typically require a substantial portion of management's time and attention. 

   The Company anticipates that future development will be financed, in whole 
or in part, through additional equity offerings or under lines of credit or 
other forms of secured or unsecured construction financing which will result 
in a risk that, upon completion of construction, permanent financing for 
newly developed properties may not be available or may be available only on 
disadvantageous terms. If a project is unsuccessful, the Company's losses may 
exceed its investment in the project. 

Real Estate Investment Risks 

   General Risks. Investments of the Company are subject to the risks 
incident to the ownership and operation of commercial real estate generally. 
The yields available from equity investments in real estate depend on the 
amount of income generated and expenses incurred. If the Company's Properties 
do not generate revenues sufficient to meet operating expenses, including 
debt service and capital expenditures, the Company's results of operations 
and ability to make distributions to its stockholders will be adversely 
affected. 

   A commercial property's revenues and value may be adversely affected by a 
number of factors, including the national, state and local economic climate 
and real estate conditions (such as oversupply of or reduced demand for space 
and changes in market rental rates); the perceptions of prospective tenants 
of the safety, convenience and attractiveness of the properties; the ability 
of the owner to provide adequate management, maintenance and 

                                     S-15 
<PAGE>
 
insurance; the ability timely to collect all rent from tenants; the expense 
of periodically renovating, repairing and reletting spaces; and increasing 
operating costs (including real estate taxes and utilities) which may not be 
passed through to tenants. Certain significant expenditures associated with 
investments in real estate (such as mortgage payments, real estate taxes, 
insurance and maintenance costs) are generally not reduced when circumstances 
cause a reduction in rental revenues from the property. If a property is 
mortgaged to secure the payment of indebtedness and if the Company is unable 
to meet its mortgage payments, a loss could be sustained as a result of 
foreclosure on the property or the exercise of other remedies by the 
mortgagee. In addition, real estate values and income from properties are 
also affected by such factors as compliance with laws, including tax laws, 
interest rate levels and the availability of financing. 

   Tenant Defaults. Substantially all of the Company's income is derived from 
rental income from real property. Consequently, the Company's results of 
operations and ability to make expected distributions to stockholders would 
be adversely affected if a significant number of tenants at the Properties 
failed to meet their lease obligations. In the event of a default by a 
lessee, the Company may experience delays in enforcing its rights as lessor 
and may incur substantial costs in protecting its investment. Additionally, 
as a significant number of the Company's tenants are in the financial 
services, legal and accounting businesses, the Company's results of 
operations and ability to make expected distributions to stockholders would 
be adversely affected if these industries experienced a significant reduction 
in workforce. At any time, a tenant of the Properties may also seek 
protection under the bankruptcy laws, which could result in rejection and 
termination of such tenant's lease and thereby cause a reduction in the cash 
available for distribution by the Company. If a tenant rejects its lease, the 
Company's claim for breach of the lease would (absent collateral securing the 
claim) be treated as a general unsecured claim. The amount of the claim would 
be capped at the amount owed for unpaid pre-petition lease payments unrelated 
to the rejection, plus the greater of one year's lease payment or 15% of the 
remaining lease payments payable under the lease (but not to exceed the 
amount of three years' lease payments). No assurance can be given that the 
Company will not experience significant tenant defaults in the future. 


   Ground Leases. Two of the Properties are the subject of long-term ground 
leases. In the case of the lease on the office and retail portions of the 
Rowes Wharf Property, the landlord becomes the owner of the portion of the 
Property subject to the lease at the expiration of the term of the lease or 
at the earlier termination by reason of a breach of the lease by the tenant. 
The lease on the Rowes Wharf Property, which expires in 2065, does not 
contain an extension option but includes an option to purchase. See 
"Properties and Pending Acquisitions--Downtown Boston Office Market." The 
ground lease pursuant to which the Company leases the South Station Property 
expires in 2024. The landowner becomes the owner of the South Station 
Property at the expiration of the term of the ground lease or at the earlier 
termination by reason of a breach of the lease by the tenant. The Company 
will have the right to extend the lease for two additional 15-year terms, 
subject to the landowner's right to terminate such additional periods upon 
two years' notice and payment to the Company of certain termination payments. 


   Market Illiquidity. Equity real estate investments are relatively 
illiquid. Such illiquidity will tend to limit the ability of the Company to 
vary its portfolio promptly in response to changes in economic or other 
conditions. In addition, provisions of the Code limit the Company's ability 
to sell properties held for fewer than four years, which may affect the 
Company's ability to sell properties without adversely affecting returns to 
holders of Common Stock. 


   Operating Risks. The Properties are subject to operating risks common to 
commercial real estate in general, any and all of which may adversely affect 
occupancy or rental rates. The Properties are subject to increases in 
operating expenses such as cleaning, electricity, heating, ventilation and 
air conditioning; elevator repair and maintenance; insurance and 
administrative costs; and other general costs associated with security, 
landscaping, repairs and maintenance. While the Company's tenants are 
currently obligated to pay these escalating costs, there can be no assurance 
that tenants will agree to pay such costs upon renewal or that new tenants 
will agree to pay such costs. If operating expenses increase, the local 
rental market may limit the extent to which rents may be increased to meet 
such increased expenses without decreasing occupancy rates. While the Company 
implements cost-saving incentive measures at each of its Properties, if any 
of the foregoing occurs, the Company's results of operations and its ability 
to make distributions to stockholders could be adversely affected. 



                                     S-16 
<PAGE>
 
Risk of Investment in Mortgage Debt 

   The Company may invest in mortgages which are secured by existing office 
and commercial properties in circumstances where the Company anticipates that 
its ownership of the mortgage may result in the acquisition of the related 
properties through foreclosure proceedings or negotiated settlements. In 
addition to the risks associated with investments in commercial office 
properties, investments in mortgage indebtedness present the additional risks 
that the fee owners of such properties may default in payments of interest on 
a current basis and that the filing of bankruptcy proceedings may stay the 
Company's foreclosure of such mortgages and receipt of payments thereunder. 
Under such circumstances, the Company may not realize its anticipated 
investment return, and may sustain losses relating to such investments. 

Possible Environmental Liabilities 


   The Company's operating costs may be affected by the obligation to pay for 
the cost of complying with existing environmental laws, ordinances and 
regulations, as well as the cost of complying with future legislation. Under 
various federal, state and local environmental laws, ordinances and 
regulations, a current or previous owner or operator of real property may be 
liable for the costs of removal or remediation of hazardous or toxic 
substances on, under or in such property. Such laws often impose liability 
whether or not the owner or operator knew of, or was responsible for, the 
presence of such hazardous or toxic substances. In addition, the presence of 
hazardous or toxic substances, or the failure to remediate such property 
properly, may adversely affect the owner's ability to borrow by using such 
real property as collateral. Persons who arrange for the transportation, 
disposal or treatment of hazardous or toxic substances may also be liable for 
the costs of removal or remediation of such substances at the disposal or 
treatment facility, whether or not such facility is or ever was owned or 
operated by such person. Certain environmental laws and common law principles 
could be used to impose liability for releases of hazardous materials, 
including asbestos-containing materials ("ACMs"), into the environment, and 
third parties may seek recovery from owners or operators of real properties 
for personal injury associated with exposure to released ACMs or other 
hazardous materials. Environmental laws may also impose restrictions on the 
manner in which a property may be used or transferred or in which businesses 
may be operated, and these restrictions may require expenditures. In 
connection with the ownership and operation of the Properties, the Company 
may be potentially liable for any such costs. The cost of defending against 
claims of liability or remediating contaminated property and the cost of 
complying with environmental laws could materially adversely affect the 
Company's results of operations and financial condition. Phase I 
environmental site assessments ("ESAs") have been conducted at all of the 
Properties by qualified independent environmental engineers. The purpose of 
Phase I ESAs is to identify potential sources of contamination for which the 
Properties may be responsible and to assess the status of environmental 
regulatory compliance. The ESAs have not revealed any environmental liability 
or compliance concerns that the Company believes would have a material 
adverse effect on the Company's business, assets, results of operations or 
liquidity, nor is the Company aware of any such liability or concerns. 
Nevertheless, it is possible that these ESAs did not reveal all environmental 
liabilities or compliance concerns or that material environmental liabilities 
or compliance concerns exist of which the Company is currently unaware. The 
Company has not been notified by any governmental authority, and has no other 
knowledge of, any material noncompliance, liability or claim relating to 
hazardous or toxic substances or other environmental substances in connection 
with any of its Properties except as previously disclosed in documents 
incorporated herein by reference or as noted below. 

   In connection with the Company's acquisition of the Fairfax County 
Portfolio, chlorinated solvents, primarily trichloroethane ("TCE"), have been 
detected in groundwater samples collected from monitoring wells located at 
the John Marshall III developable land (the "JM III Parcel"). Subsequent 
investigations of the JM III Parcel by an environmental consultant retained 
by the sellers of the Fairfax County Portfolio (the "Consultant") confirmed 
the presence of chlorinated solvents in groundwater at the JM III Parcel and 
on property adjacent to the JM III Parcel where an autobody repair shop is 
located. 

   The sellers of the Fairfax County Portfolio have reported the findings of 
chlorinated solvent contamination on the JM III Parcel to the Virginia 
Department of Environmental Quality. The Consultant has concluded that the 
autobody repair shop is the probable source for the chlorinated solvent 
contamination, and is in the process of collecting additional soil and 
groundwater samples to confirm that conclusion and to prepare a remediation 
plan for the site. Under the terms of the option agreement relating to the 
Fairfax County Portfolio acquisition, the sellers of the property must 
produce a remediation plan (the "Remediation Plan") regarding the JM III 
Parcel by 


                                     S-17 
<PAGE>
 

August 20, 1996. The Company may, in its sole discretion, terminate the 
option to purchase the Fairfax County Portfolio if the Remediation Plan is 
not acceptable to the Company. 



Risks of Investments in Subsidiaries 

   The capital stock of each of Beacon Property Management Corporation, 
Beacon Construction Company, Inc. and Beacon Design Corporation 
(collectively, the "Subsidiary Corporations") is divided into two classes: 
voting common stock, 99% of which is held by officers and/or directors of 
such Subsidiary Corporations (each of whom, as of the date of this Prospectus 
Supplement, is also an officer and/or director of the Company) and 1% of 
which is held by the Operating Partnership, and nonvoting common stock, 100% 
of which is held by the Operating Partnership. Management's 99% voting common 
stock represents 1% of the economic interests in each of the Subsidiary 
Corporations. Members of each Subsidiary Corporation's management, as the 
holders of 99% of the voting common stock, retain the ability to elect the 
board of directors of each of the Subsidiary Corporations. Although the 
nonvoting common stock and the voting common stock of each of the Subsidiary 
Corporations held by the Company represent 99% of the economic interests in 
such corporations, the Company is not able to elect directors and its ability 
to influence the day-to-day decisions affecting these corporations may 
therefore be limited. As a result, the board of directors and management of 
each of the Subsidiary Corporations may implement business policies or 
decisions that would not have been implemented by persons controlled by the 
Company that are adverse to the interests of the Company or that lead to 
adverse financial results, which could adversely impact the Company's results 
of operations. The bylaws of each of the Subsidiary Corporations require that 
the voting common stock in such Subsidiary Corporation be held by officers of 
such Subsidiary Corporation at all times and require holders of voting common 
stock to enter into an agreement to that effect. 

Risks of Third-Party Management 

   The Company manages Properties in which it does not own a controlling 
interest and intends to actively pursue the management of properties which 
are owned by third parties. Risks associated with the management of 
properties which are not controlled by the Company and properties owned by 
third parties include the risk that management contracts (which are typically 
cancelable without notice) will be terminated by the entity controlling the 
property or in connection with the sale of such property, the risk that 
contracts may not be renewed upon expiration or may not be renewed on terms 
consistent with current terms and the risk that the rental revenues upon 
which management fees are based will decline as a result of general real 
estate market conditions or specific market factors affecting properties 
managed by the Company, resulting in decreased management fee income. 
Although the Company has several third-party management contracts, there can 
be no assurance that these management contracts will not be terminated by the 
property owners in the future. 


Effect of Market Interest Rates on Price of Common Stock 

   One of the factors that will influence the market price of the Common 
Stock in public markets is the annual yield on the price paid for shares of 
Common Stock from distributions by the Company. An increase in market 
interest rates may lead prospective purchasers of the Common Stock to demand 
a higher annual yield from future distributions. Such an increase in the 
required distributions yield may adversely affect the market price of the 
Common Stock. 


                                     S-18 
<PAGE>

                                  THE COMPANY

General 


   The Company is a self-administered and self-managed REIT which owns a 
portfolio of Class A office properties and other commercial properties 
located in major metropolitan areas, including Boston and Atlanta, as well as 
commercial real estate development, construction, acquisition, leasing and 
management businesses. Class A office properties generally are considered to 
be those that have excellent locations and access, attract high quality 
tenants, are well maintained and professionally managed, and achieve among 
the highest rent, occupancy and tenant retention rates within their markets. 
The Properties comprise approximately 10 million rentable square feet in the 
aggregate and, as of June 30, 1996, were approximately 96% leased with over 
800 tenants. 

   The Company has entered into contracts to acquire the Pending Acquisitions 
comprised of ten office buildings encompassing approximately 1.6 million 
additional rentable square feet located in Fairfax County, Virginia, 
Washington, D.C. and suburban Chicago, Illinois for an aggregate purchase 
price of $227 million. If all of the Pending Acquisitions are consummated, 
the Company will own or have an interest in 68 income producing commercial 
properties encompassing approximately 11.6 million rentable square feet and 
will have a total market capitalization of approximately $1.5 billion. 


   The Company's executive offices are located at 50 Rowes Wharf in Boston, 
Massachusetts 02110 and its telephone number at that location is (617) 
330-1400. 


                             RECENT DEVELOPMENTS 



Pending Acquisitions 


   As part of its ongoing business, the Company continually conducts 
strategic analyses of major office markets in the United States to determine 
those markets which warrant acquisition of office properties. The Company 
places particular emphasis on office-using employment growth as well as the 
prospects for future supply of office space in each of the markets. The 
Company has determined that, in addition to the Boston, Atlanta and 
Washington, D.C. markets, in which the Company now operates, the suburban 
Chicago market, where two of the Pending Acquisitions are located, and other 
select markets, also possess attractive market fundamentals. 

   The Chicago metropolitan area, with over 50 Fortune 500 companies, is a 
major regional center with a strong infrastructure. According to the U.S. 
Bureau of Labor Statistics, the Chicago metropolitan area gained 
approximately 34,000 office-using jobs for the twelve months ended March 31, 
1996. The Company believes that several Chicago suburban office submarkets 
are attractive due to employment growth in office-using jobs, the relatively 
short time frame expected to absorb the existing supply of office space and 
low vacancy rates. The Company also believes that its development and 
management experience in the Chicago market will benefit the Company's 
expansion into this market. The Company currently manages approximately 1.3 
million square feet of office/industrial space in the Chicago area. 
Additionally, the Company's construction subsidiary has actively participated 
in several projects in the Chicago area over the past several years. 

   The greater Washington, D.C. area, including northern Virginia, is also a 
major regional center with a strong infrastructure. According to the U.S. 
Bureau of Labor Statistics, the Washington, D.C. metropolitan area gained 
approximately 31,000 office-using jobs for the twelve months ended March 31, 
1996. The Company believes that Fairfax County, Virginia represents an 
attractive market due to its employment growth in the high technology, 
professional service and telecommunications sectors, the relatively short 
time frame expected to absorb the existing supply of office space and low 
vacancy rates. The Company also believes that its extensive development and 
management experience in the greater Washington, D.C. market will benefit its 
further acquisition of properties in this area. The Company currently manages 
approximately 1.3 million square feet in the greater Washington, D.C. area, 
including the Polk and Taylor Buildings. 

   The Company has entered into contracts to purchase the Pending 
Acquisitions for aggregate consideration of $227 million. The purchase of 
each of the Pending Acquisitions is subject to various closing conditions, 
including, but not limited to, satisfactory completion of the Company's due 
diligence and, with respect to the Fairfax County Portfolio, agreement 
regarding the terms of the remediation of certain environmental matters 
concerning the John Marshall III land. See "Risk Factors--Possible 
Environmental Liabilities." The Company currently expects to 


                                     S-19 
<PAGE>
 

complete the purchase of the Pending Acquisitions during early September 
1996. No assurances can be made that the Company will acquire any or all of 
the Pending Acquisitions. 

   In addition to the Pending Acquisitions, as part of its ongoing business, 
the Company continually engages in discussions with public and private real 
estate entities regarding possible portfolio or single asset acquisitions in 
various major metropolitan areas. No assurance can be made that the Company 
will acquire any of the property opportunities currently under review. 

   Set forth below are summary descriptions of the Pending Acquisitions. 

   New York Life Portfolio. In July 1996, the Company entered into a contract 
to acquire the New York Life Portfolio for an aggregate consideration of $150 
million in cash. The Company intends to use the net proceeds of the Offering 
to consummate the purchase. 

   The New York Life Portfolio consists of (i) the 8-story AT&T Plaza located 
in Oak Brook (suburban Chicago), Illinois built in 1984 comprising 
approximately 225,000 square feet of office space; (ii) the five-building 
Tri-State International office park located in Lincolnshire (suburban 
Chicago), Illinois built in 1986 comprising approximately 548,000 square 
feet; and (iii) an 11-story office property located at 1333 H Street in 
metropolitan Washington, D.C. comprising approximately 239,000 square feet 
(approximately 205,000 of which was built in 1982). Major tenants in the New 
York Life Portfolio include AT&T (approximately 40,000 square feet), A.C. 
Nielsen Company (approximately 55,000 square feet) and Reuters (approximately 
55,000 square feet). The aggregate occupancy rate for the New York Life 
Portfolio as of June 30, 1996 was approximately 81%. 

   AT&T Plaza and the Tri-State International office park are located in the 
Suburban Chicago Office Market. According to Grubb & Ellis, the entire 
Suburban Chicago Office Market had an overall vacancy of 12.0% as of June 
1996, while the East-West Corridor submarket (location of AT&T Plaza) and the 
North Suburban Submarket (location of the Tri-State International office 
park) had vacancy rates of 10.3% (9.2% for Class A office properties) and 
12.6% (8.2% for Class A office properties), respectively, for the same 
period. Grubb & Ellis also reports that the East-West Corridor and North 
Suburban submarkets experienced Net Absorption of 730,000 square feet and 
340,000 square feet, respectively, for the first six months of 1996. 

   Upon the acquisition of the New York Life Portfolio, the Company intends 
to establish a regional office in the Chicago area to facilitate the leasing 
and management of the properties. 

   The 1333 H Street property is located in the Washington, D.C. Office 
Market. According to Grubb & Ellis, the entire Washington, D.C. Office Market 
had an overall vacancy rate of 10.2% as of March 1996, while the East End 
submarket (location of 1333 H Street) experienced a vacancy rate of 10.1% for 
the same period. 

   The Capitalization Rate (calculated by dividing (a) the expected net 
operating income (including the effect of straight line rents) generated by 
the portfolio based upon annualized revenues from signed leases in place at 
the properties as of June 30, 1996 by (b) the consideration paid for the 
Properties) of the New York Life Portfolio acquisition is approximately 8.6%. 
In the event weighted average occupancy for the New York Life Portfolio 
increases to 95%, the Capitalization Rate would increase to 10.8%. The 
Company expects to purchase the New York Life Portfolio for cash; 
consequently, the Returns on Equity for the acquisition are equivalent to the 
Capitalization Rates. No assurance can be made that the Company will achieve 
such occupancy levels or increases in returns. 

   Fairfax County Portfolio. In June 1996, the Company exercised an option to 
acquire the Fairfax County Portfolio for an aggregate consideration of $77 
million. In connection with this acquisition, the Company has agreed to 
maintain at least $45.2 million of debt on the properties for certain periods 
of time. 

   The Fairfax County Portfolio consists of the (i) the 11-story John 
Marshall I building located in the Tysons Corner area of McLean, Virginia, 
built in 1981 comprising approximately 261,000 square feet of office space; 
(ii) the 11-story E.J. Randolph building located in the Tysons Corner area of 
McLean, Virginia, built in 1983 comprising approximately 165,000 square feet 
of office space; (iii) the 6-story Northridge I building located in 
Reston/Herndon area of Virginia, built in 1988 comprising approximately 
124,000 square feet of office space; and (iv) the John Marshall III parcel of 
developable land, with approximately 150,000 square feet of building 
capacity, located in the Tysons Corner area of McLean, Virginia. Major 
tenants in the Fairfax County Portfolio include Booz, Allen 


                                     S-20 
<PAGE>
 

& Hamilton, Inc. (approximately 320,000 square feet) and Sprint Corporation 
(approximately 124,000 square feet). The aggregate occupancy rate of the 
Fairfax County Portfolio as of June 30, 1996 was approximately 94%. 

   According to Grubb & Ellis, the Fairfax County, Virginia Market had an 
overall vacancy rate of 8.0% as of March 1996, and the submarkets of Tysons 
Corner and Reston/Herndon had vacancy rates of 8.2% and 5.3%, respectively, 
for the same period. Grubb & Ellis also reports that Tysons Corner and 
Reston/Herndon submarkets experienced Net Absorption of 600,000 square feet 
and 400,000 square feet, respectively, for the three months ended March 31, 
1996. 

   The Capitalization Rate of the Fairfax County Portfolio acquisition is 
approximately 11.5%. The Return on Equity invested by the Company in the 
Fairfax County Portfolio is expected to be 21.3% assuming the repayment of 
approximately $18 million of debt assumed in connection with the acquisition 
with a draw on the Credit Facility. Return on Equity is calculated by 
dividing (a) the expected net operating income (including the effect of 
straight line rents) generated by the portfolio based upon annualized 
revenues from signed leases in place at the properties as of June 30, 1996 
less expected debt service on the principal amount of the mortgage debt and 
the Credit Facility debt that will encumber the properties upon completion of 
the acquisition by (b) the consideration paid for the properties less the 
principal amount of the mortgage debt and the Credit Facility debt that will 
encumber the properties upon completion of the acquisition. 

   The blended Capitalization Rate on both the New York Life Portfolio and 
the Fairfax County Portfolio is 9.6%. In the event weighted average occupancy 
for the New York Life Portfolio increases to 95%, the blended Capitalization 
Rate for the acquisitions would be 11.1%. No assurances can be made that the 
Company will achieve such occupancy levels or increases in returns. 

   The Company intends to finance the New York Life Portfolio and the Fairfax 
County Portfolio acquisitions with the proceeds of this Offering and cash 
and, with respect to the Fairfax County Portfolio, the assumption of $55.4 
million of mortgage debt secured by the properties ($18 million of which will 
be repaid with a draw on the Credit Facility) and the issuance of 839,223 
Units. The blended Return on Equity invested by the Company in both the New 
York Life Portfolio and the Fairfax County Portfolio is 10.2% or, assuming 
the weighted average occupancy for the New York Life Portfolio increases to 
95%, 12.1%. No assurances can be made that the Company will achieve such 
occupancy levels or increases in returns. 

Activities Relating to the Perimeter Center Portfolio 

   In February 1996, the Company purchased the Perimeter Center Portfolio, 
associated ground leases, and rights and options to purchase adjoining land 
for approximately $336 million (excluding associated acquisition-related 
expenses). In March 1996, MetLife provided the $218 million MetLife Loan to 
the Company. The MetLife Loan bears interest at a rate of 7.08% fixed over 
the ten year term of the loan. As of June 30, 1996, the aggregate occupancy 
rate of the Perimeter Center Portfolio was approximately 97%, an increase 
from an aggregate occupancy rate of 94% as of December 31, 1995. As a result 
of the closing of the Met Life Loan and the increased occupancy at the 
Property, the Capitalization Rate of the Perimeter Center Portfolio is 
approximately 11.4% and the Return on Equity invested by the Company in the 
Property is approximately 19.4%. 

Financing Activities 

   In June 1996, the Company substantially modified the terms of the Credit 
Facility. Additionally, in July 1996, the maximum loan amount available under 
the Credit Facility was increased to $300 million. The Credit Facility 
matures in June 1999. Outstanding balances under the Credit Facility bear 
interest, at the Company's option, at either (i) the higher of (x) Bank of 
Boston's base interest rate and (y) one-half of one percent (1/2%) above the 
overnight federal funds effective rate or (ii) the Eurodollar rate plus 175 
basis points. Following the closing of this Offering and the acquisition of 
the Pending Acquisitions, the Company will have available approximately $210 
of borrowing capacity under the Credit Facility, of which approximately $18 
million will be outstanding. In order to increase the borrowing capacity to 
the maximum $300 million, the Company anticipates that it will be required to 
grant mortgages on additional properties. 


                                     S-21 
<PAGE>

Increase in Distributions 


   In July 1996, the Company announced an increase in its quarterly 
distribution of 10.1%, increasing the quarterly distribution on its Common 
Stock from $.42 per share to $.4625 per share, which, on an annualized basis, 
is equal to an annual distribution of $1.85 per share of Common Stock. The 
higher distribution rate commenced with the Company's distribution with 
respect to the second quarter of 1996, to be paid on August 23, 1996, to 
stockholders of record as of August 14, 1996. Accordingly, it is currently 
expected that purchasers of Common Stock in the Offering who hold Common 
Stock as of the record date will receive the second quarter 1996 distribution 
in respect of the shares of Common Stock offered hereby. 



Other Developments 


   Rowes Wharf Mortgage Debt. In connection with the Initial Offering, the 
Company acquired a 45% indirect limited partner interest in Rowes Wharf 
Associates, the entity that owns the hotel space and leases the office and 
retail space at the Rowes Wharf Property. During the period from April 1995 
through June 1996, the Company (together with an affiliate) and Equitable, 
the Company's joint venture partner in the Rowes Wharf Property, acquired all 
of the outstanding mortgage debt on the Rowes Wharf Property. The mortgage 
debt was purchased at approximately 50% of face value. See "Properties and 
Pending Acquisitions--Mortgage Indebtedness and Credit Facility." 

   Crosby Corporate Center. The Company has substantially completed a $16 
million redevelopment of Crosby Corporate Center, repositioning the Property 
from research/development space to a Class A suburban office park. As of June 
30, 1996, Crosby Corporate Center was approximately 88% leased. Additionally, 
the Company has entered into an agreement to acquire a 29-acre parcel of land 
adjacent to the Crosby Corporate Center. This parcel will support 
approximately 250,000 square feet of buildings and the Company expects that 
development of a significant portion of the land could commence in early 
1997, although no assurances can be made in this regard. The Company believes 
that demand for office space in the greater Boston Suburban Office Market 
(the location of the Crosby Corporate Center) will continue as several major 
tenants at the Property experience substantial growth. No assurance can be 
made that such increased demand will occur. 


                                      S-22
<PAGE>


                       PROPERTIES AND PENDING ACQUISITIONS

   The Company owns or has an interest in a portfolio of Class A office 
properties and other commercial properties in prime locations in the greater 
Boston and Atlanta metropolitan areas, in Arlington, Virginia, and in the 
suburban Philadelphia area encompassing approximately 10 million rentable 
square feet. Class A office properties generally are considered to have 
excellent locations and access, attract high quality tenants, be well 
maintained and professionally managed and achieve among the highest rent, 
occupancy and tenant retention rates within their markets. 



The Downtown Boston Office Market 

Market Information 

   According to Spaulding & Slye, as of March 1996, there were approximately 
48 million square feet of private sector office space in the Downtown Boston 
Office Market. The following table sets forth the vacancy rates for the 
Downtown Boston Office Market from 1991 through March 1996. 


                Period         Vacancy Rate 
                ------         ------------ 
1991                               18.4% 
1992                               15.9% 
1993                               16.3% 
1994                               12.1% 
1995                               11.5% 
January--March 1996                11.3% 


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

Source: Spaulding & Slye Office Market Reports 1990 through April 1996. 


   Spaulding & Slye reports that Net Absorption in 1995 was 400,000 square 
feet and 1.9 million square feet in 1994. This significant amount of Net 
Absorption is largely due to growth in the financial services, publishing and 
legal sections, together with the relocation of certain federal government 
groups. 



Property Descriptions 

   The following chart describes each of the Company's Properties located in 
the Downtown Boston Office Market. 

<TABLE>
<CAPTION>
                                                 Rentable 
                                     Year          Area                 Company's 
                                    Built/      in Square     No. of        % 
Property                          Renovated        Feet      Stories    Ownership      Parking 
- --------                          ---------     ---------    -------    ---------      ------- 
<S>                               <C>           <C>             <C>        <C>        <C>
175 Federal Street                     1977       203,349       17         100%       No 
One Post Office Square                 1981       764,129       41          50%(a)    375-car garage 
South Station                          1988       148,591        5          (b)       (c) 
Center Plaza                      1966-1969       649,359        9          (d)       575-car garage 
Rowes Wharf                            1987       344,326       15          (e)       550-car garage 
Russia Wharf                      1978-1982       314,596       (f)        100%       146 spaces 
150 Federal Street                     1988       530,279       28         100%       285-car garage 
2 Oliver Street--147 Milk 
  Street                          1982-1988       271,000       (g)        100%       No 
75 Federal Street                      1985       252,000       21          (h)       No 
101 Federal Street                     1988       560,000       31          (h)       195-car garage 
                                                 --------- 
    Total                                       4,037,629 
                                                 ========= 
</TABLE>

- ------------- 
(a) One Post Office Square is owned by a joint venture between Equitable and 
    the Company. The Company has a 50% interest in and is the managing 
    venturer of this joint venture. 

(b) The Company owns 100% of a ground leasehold in this Property. 


(c) A 600-car garage is under construction by the Massachusetts Bay 
    Transportation Authority. 


(d) The Company holds a 1% general partner interest, a 75% limited partner 
    interest and an option to purchase the remaining 24% limited partner 
    interest in the partnership that owns the Center Plaza Property. 

                                     S-23 
<PAGE>
 
(e) The Company holds a 90% limited partner interest in Rowes Wharf Limited 
    Partnership. Rowes Wharf Limited Partnership and Equitable each holds a 
    50% general partner interest in Rowes Wharf Associates, the partnership 
    that owns the hotel space and leases the office and retail space at the 
    Rowes Wharf Property. Consequently, the Company owns a 45% indirect 
    limited partner interest in Rowes Wharf Associates. A Beacon Affiliate is 
    the general partner of Rowes Wharf Limited Partnership. As general 
    partner, this Beacon Affiliate has the authority to mortgage or sell all 
    of the limited partnership's interest in Rowes Wharf without the 
    Company's consent. 

(f) Russia Wharf is a complex of three seven-story buildings. 

(g) 2 Oliver Street is an 11-story office building and 147 Milk Street is an 
    adjacent 10-story office building. 

(h) Fee interest in the 75-101 Federal Street Property is held by a private 
    REIT, BeaMetFed. The Company holds approximately 51.6% of the common 
    stock of BeaMetFed, and the Company's co-investor, Bedrifspensioenfonds 
    voor de Metaallnijverheid (the "Dutch Metal Workers Pension Fund"), holds 
    approximately 48.0% of the common stock of BeaMetFed. The remaining 
    approximately 0.4% interest is held by other stockholders. Simultaneously 
    with BeaMetFed's acquisition of the 75-101 Federal Street Property in 
    September 1995, the Company issued 718,000 shares of Common Stock to the 
    Dutch Metal Workers Pension Fund, a transaction that resulted in net 
    proceeds of approximately $15.0 million. 

Base Rents and Net Effective Rents 


   The following charts set forth the average annual Base Rent (as defined 
below) and the average annual Net Effective Rent (as defined below) per 
square foot for each of the Company's Properties in the Downtown Boston 
Office Market. Base Rent is gross rent excluding payments by tenants on 
account of real estate tax and operating expense escalation. Net Effective 
Rent is Base Rent adjusted on a straight-line basis for contractual rent 
step-ups and free rent periods, plus tenant payments on account of real 
estate tax and operating expense escalation, less total operating expenses 
and real estate taxes. 



                                        Average Annual Base Rents 
                          ----------------------------------------------------- 
                                                                        As of 
Property                   1991     1992     1993     1994     1995    6/30/96 
- ----------------------     -----    -----    -----    -----    -----   -------- 
                                            (per square foot) 
175 Federal Street       $12.98   $14.81   $17.79   $21.15   $23.82     $24.66 
One Post Office Square    24.78    22.41    21.85    22.99    23.55      23.88 
South Station             28.94    28.51    28.51    27.24    28.26      28.70 
Center Plaza              21.27    19.65    21.40    22.98    22.95      22.29 
Rowes Wharf               36.06    30.87    30.04    30.39    30.87      30.37 
150 Federal Street        25.58    21.20    23.88    24.25    24.67      24.93 
Russia Wharf(a)            --       --       --       --      12.53      13.75 
75-101 Federal 
  Street(a)                --       --       --       --      28.00      28.28 
2 Oliver Street(a)         --       --       --       --      16.46      16.63 
                            ---      ---      ---      ---      ---      ------ 
    Weighted Average     $25.04   $22.38   $23.30   $24.34   $23.75     $24.46 
                            ===      ===      ===      ===      ===      ====== 


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


(a) Russia Wharf, 75-101 Federal Street and 2 Oliver Street were acquired by 
    the Company subsequent to the Initial Offering and, consequently, 
    information prior to the date of acquisition is unavailable. 



                                     S-24 
<PAGE>
 
                                   Average Annual Net Effective Rents 
                          ----------------------------------------------------- 
                                                                        As of 
Property                   1991     1992     1993     1994     1995    6/30/96 
- ----------------------     -----    -----    -----    -----    -----   -------- 
                                            (per square foot) 
175 Federal Street       $ 9.88   $12.40   $13.03   $13.97   $15.40     $16.49 
One Post Office Square    17.87    14.47    14.32    15.01    15.03      14.98 
South Station             17.24    14.56    15.87    18.16    20.05      20.75 
Center Plaza               3.80     5.61     9.79    13.27    13.18      12.29 
Rowes Wharf               22.15    14.26    15.45    17.65    18.22      17.88 
150 Federal Street        20.17    17.51    19.99    20.95    21.14      21.14 
Russia Wharf(a)            --       --       --       --       7.86       7.92 
75-101 Federal 
  Street(a)                --       --       --       --      19.10      18.48 
2 Oliver Street(a)         --       --       --       --      11.53      11.60 
                            ---      ---      ---      ---      ---      ------ 
    Weighted Average     $15.20   $13.16   $14.77   $16.22   $15.78     $16.02 
                            ===      ===      ===      ===      ===      ====== 

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


(a) Russia Wharf, 75-101 Federal Street and 2 Oliver Street were acquired by 
    the Company subsequent to the Initial Offering and, consequently, 
    information prior to the date of acquisition is unavailable. 



Occupancy Rates 


   The following chart sets forth the occupancy rate, expressed as a 
percentage, for each of the Company's Properties in the Downtown Boston 
Office Market. 


<TABLE>
<CAPTION>
                                                  Occupancy Rate 
                              ------------------------------------------------------- 
                                                                             As of 
Property                       1991     1992     1993     1994     1995     6/30/96 
- --------------------------     -----    -----    -----    -----    -----   ---------- 
<S>                             <C>      <C>      <C>     <C>      <C>        <C>  
175 Federal Street              94%     100%     100%      94%      84%        89% 
One Post Office Square          95%      93%      95%      97%      99%        99% 
South Station                   94%      96%      98%     100%     100%       100% 
Center Plaza                    71%      73%      76%      84%      91%        93% 
Rowes Wharf                     96%      91%      92%      96%      98%        99% 
150 Federal Street              68%      98%      99%      98%      99%       100% 
Russia Wharf(a)                 --      --       --       --        94%       100% 
75-101 Federal Street(a)        --      --       --       --        93%        94% 
2 Oliver Street(a)              --      --       --       --        93%        95% 
                                ---      ---      ---      ---      ---      -------- 
    Weighted Average            84%      90%      91%      94%      95%        96% 
                                ===      ===      ===      ===      ===      ======== 
</TABLE>

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


(a) Russia Wharf, 75-101 Federal Street and 2 Oliver Street were acquired by 
    the Company subsequent to the Initial Offering and, consequently, 
    information prior to the date of acquisition is unavailable. 



                                     S-25 
<PAGE>
 
Lease Expirations 

   The following table sets forth lease expirations (in square feet) for each 
of the Company's Properties in the Downtown Boston Office Market. 


<TABLE>
<CAPTION>
                                                    Lease Expirations--Downtown Boston Office Market 
                           --------------------------------------------------------------------------------------------------- 
                                                        7/1/96 
                                                          to 
Property                                               12/31/96         1997           1998             1999            2000 
 ----------------------                               -----------    -----------    -----------      -----------   ------------- 
<S>                         <C>                       <C>            <C>            <C>            <C>            <C>
175 Federal                 square feet (a)               9,318          3,610          4,775                0          34,079 
                            % sq. ft. (b)                   4.6%           1.8%           2.3%             0.0%           16.8% 
                            annual rent (c)            $197,199        $91,728       $201,745               $0        $816,972 
                            psf (d)                      $21.16         $25.41         $42.25(f)         $0.00          $23.97 
                            tenants (e)                       3              1              1                0               8 
                                                                                                  
Center Plaza                square feet (a)              15,768         76,044         89,314           35,245          96,244 
                            % sq. ft. (b)                   2.4%          11.7%          13.8%             5.4%           14.8% 
                            annual rent (c)            $280,387     $1,990,760     $2,016,537         $741,628      $2,341,012 
                            psf (d)                      $17.78         $26.18         $22.58           $21.04          $24.32 
                            tenants (e)                       5              8              7                9              12 
                                                                                                  
One Post Offc. Sq.          square feet (a)              24,516         39,981         28,280           33,702          33,536 
                            % sq. ft. (b)                   3.2%           5.2%           3.7%             4.4%            4.4% 
                            annual rent (c)            $771,775     $1,140,656       $787,255         $982,382      $1,001,692 
                            psf (d)                      $31.48         $28.53         $27.84           $29.15          $29.87 
                            tenants (e)                       2              8              6               11               6 
                                                                                                  
South Station (g)           square feet (a)                 410          1,086         11,541            1,401           2,373 
                            % sq. ft. (b)                   0.3%           0.7%           7.8%             0.9%            1.6% 
                            annual rent (c)             $72,623       $113,935     $1,065,930         $391,925        $325,685 
                            psf (d)                     $177.13        $104.91         $92.36          $279.75         $137.25 
                            tenants (e)                       3              2              2                4               5 
                                                                                                  
Rowes Wharf                 square feet (a)               8,080         63,281        121,332           37,865          18,479 
                            % sq. ft. (b)                   2.3%          18.4%          35.2%            11.0%            5.4% 
                            annual rent (c)            $212,640     $1,679,065     $4,215,221       $1,186,919        $553,215 
                            psf (d)                      $26.32         $26.53         $34.74           $31.35          $29.94 
                            tenants (e)                       3              5              9                7               4 
                                                                                                  
150 Federal                 square feet (a)              13,154         12,458        223,826           41,472          44,562 
                            % sq. ft. (b)                   2.5%           2.3%          42.2%             7.8%            8.4% 
                            annual rent (c)            $319,027       $279,204     $9,197,800       $1,134,535      $1,505,946 
                            psf (d)                      $24.25         $22.41         $41.09           $27.36          $33.79 
                            tenants (e)                       7              2              3                2               7 
                                                                                                  
Russia Wharf                square feet (a)              14,166         57,452         34,028           65,854          81,488 
                            % sq. ft. (b)                   4.6%          18.5%          10.9%            21.2%           26.2% 
                            annual rent (c)            $214,867       $810,965       $534,727         $993,244      $1,288,587 
                            psf (d)                      $15.17         $14.12         $15.71           $15.08          $15.81 
                            tenants (e)                       4             13              7                6               9 
                                                                                                  
75 Federal                  square feet (a)              33,447          3,567         43,757           53,476          39,339 
                            % sq. ft. (b)                  13.2%           1.4%          17.3%            21.1%           15.5% 
                            annual rent (c)            $833,181        $66,780     $1,139,304       $1,659,858        $895,715 
                            psf (d)                      $24.91         $18.72         $26.04           $31.04          $22.77 
                            tenants (e)                       6              1             11                7               5 
                                                                                                  
101 Federal                 square feet (a)              12,555         74,217        110,411          100,831           6,475 
                            % sq. ft. (b)                   2.2%          13.3%          19.7%            18.0%            1.2% 
                            annual rent (c)            $268,982     $2,007,590     $3,859,939      $3,723,712         $198,808 
                            psf (d)                      $21.42         $27.05         $34.96           $36.93          $30.70 
                            tenants (e)                       2              5              8                9               3 
                                                                                                  
2 Oliver                    square feet (a)              25,310         36,851         15,287           37,802          50,960 
                            % sq. ft. (b)                   9.4%          13.7%           5.7%            14.0%           18.9% 
                            annual rent (c)            $460,830       $602,347       $292,758         $626,542      $1,012,749 
                            psf (d)                      $18.21         $16.35         $19.15           $16.57          $19.87 
                            tenants (e)                       4             10              8                9              10 
                                                       ---------      ---------      ---------        ---------      ----------- 
TOTAL                       square feet (a)             156,724        368,547        682,551          407,648         407,535 
                            % sq. ft. (b)                   3.9%           9.1%          16.9%            10.1%           10.1% 
                            annual rent (c)          $3,631,511     $8,783,029    $23,311,216      $11,440,746      $9,940,380 
                            psf (d)                      $23.17         $23.83         $34.15           $28.07          $24.39 
                            tenants (e)                      39             55             62               64              69 
</TABLE>


<TABLE>
<CAPTION>
                                                    Lease Expirations--Downtown Boston Office Market 
                           --------------------------------------------------------------------------------------------------- 
                                                                                                                     2005 & 
Property                                                 2001           2002           2003           2004           beyond 
 ----------------------                               -----------    -----------    -----------    -----------   ------------- 
<S>                         <C>                       <C>            <C>            <C>            <C>            <C>
175 Federal                 square feet (a)                12,329         66,306             0          6,793          45,482 
                            % sq. ft. (b)                     6.1%          32.6%          0.0%           3.3%           22.4% 
                            annual rent (c)              $322,784     $2,242,683            $0       $176,618      $1,426,193 
                            psf (d)                        $26.18         $33.82         $0.00         $26.00          $31.36 
                            tenants (e)                         4              2             0              1               1 

Center Plaza                square feet (a)                50,791         15,656       128,201         40,035          57,235 
                            % sq. ft. (b)                     7.8%           2.4%         19.7%           6.2%            8.8% 
                            annual rent (c)            $1,291,605       $506,492    $3,531,104     $1,108,376      $1,584,854 
                            psf (d)                        $25.43         $32.35        $27.54         $27.69          $27.69 
                            tenants (e)                         8              4             2              4               6 

One Post Offc. Sq.          square feet (a)               425,162              0         8,673              0         164,434 
                            % sq. ft. (b)                    55.6%           0.0%          1.1%           0.0%           21.5% 
                            annual rent (c)           $12,467,208             $0      $314,917             $0      $4,372,464 
                            psf (d)                        $29.32          $0.00        $36.31          $0.00          $26.59 
                            tenants (e)                         4              0             1              0               2 

South Station (g)           square feet (a)                   105        125,999           500          2,410             725 
                            % sq. ft. (b)                     0.1%          84.8%          0.3%           1.6%            0.5% 
                            annual rent (c)               $20,721     $4,326,715       $81,980       $429,037        $100,050 
                            psf (d)                       $197.34         $34.34       $163.96        $178.02         $138.00 
                            tenants (e)                         1              5             1              3               1 

Rowes Wharf                 square feet (a)                10,356         75,362             0          5,280               0 
                            % sq. ft. (b)                     3.0%          21.9%          0.0%           1.5%            0.0% 
                            annual rent (c)              $308,983     $2,983,590            $0       $116,096              $0 
                            psf (d)                        $29.84         $39.59         $0.00         $21.99           $0.00 
                            tenants (e)                         2              2             0              1               0 

150 Federal                 square feet (a)                11,119        183,239             0              0               0 
                            % sq. ft. (b)                     2.1%          34.6%          0.0%           0.0%            0.0% 
                            annual rent (c)              $282,846     $5,143,936            $0             $0              $0 
                            psf (d)                        $25.44         $28.07         $0.00          $0.00           $0.00 
                            tenants (e)                         2              3             0              0               0 

Russia Wharf                square feet (a)                12,334          7,590         5,782          1,835          30,773 
                            % sq. ft. (b)                     4.0%           2.4%          1.9%           0.6%            9.9% 
                            annual rent (c)              $215,497       $121,440      $103,498        $27,905        $566,128 
                            psf (d)                        $17.47         $16.00        $17.90         $15.21          $18.40 
                            tenants (e)                         3              1             1              2               1 

75 Federal                  square feet (a)                20,603              0        22,630              0               0 
                            % sq. ft. (b)                     8.1%           0.0%          8.9%           0.0%            0.0% 
                            annual rent (c)              $424,792             $0      $623,270             $0              $0 
                            psf (d)                        $20.62          $0.00        $27.54          $0.00           $0.00 
                            tenants (e)                         3              0             2              0               0 

101 Federal                 square feet (a)               112,763         19,310             0         77,794          31,394 
                            % sq. ft. (b)                    20.1%           3.4%          0.0%          13.9%            5.6% 
                            annual rent (c)            $5,084,995       $473,926            $0     $1,989,684        $942,527 
                            psf (d)                        $45.09         $24.54         $0.00         $25.58          $30.02 
                            tenants (e)                         4              1             0              1               2 

2 Oliver                    square feet (a)                12,946          1,750         6,155              0          68,205 
                            % sq. ft. (b)                     4.8%           0.6%          2.3%           0.0%           25.3% 
                            annual rent (c)              $240,736        $32,375      $104,635             $0      $2,138,679 
                            psf (d)                        $18.60         $18.50        $17.00          $0.00          $31.36 
                            tenants (e)                         4              1             1              0               2 
                                                        ---------      ---------      ---------      ---------      ----------- 
TOTAL                       square feet (a)               668,508        495,212       171,941        134,147         398,248 
                            % sq. ft. (b)                    16.6%          12.3%          4.3%           3.3%            9.9% 
                            annual rent (c)           $20,660,167    $15,831,158    $4,759,403     $3,847,716     $11,130,895 
                            psf (d)                        $30.90         $31.97        $27.68         $28.68          $27.95 
                            tenants (e)                        35             19             8             12              15 
</TABLE>

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

(a) Total area in square feet covered by such leases 

(b) Percentage of total square feet represented by such leases 

(c) Annualized expiring base rental income represented by such leases in the 
    year of expiration plus 1995 tenant payments on account of real estate 
    tax and operating expense escalations, except leases with CPI increases 
    in lieu of expense recoveries. 

(d) Calculated as annual rent divided by square feet 

(e) The number of tenants whose lease will expire 

(f) Lease expirations reflect retail tenants only for 1998. 

(g) Lease expirations reflect retail tenants only for 1996 through 2001 and 
    2003 and beyond. 


                                     S-26
<PAGE>

The North Central Atlanta Office Market 

Market Information 

   According to Jamison, as of March 1996 there were approximately 89.5 
million square feet of office space in the Atlanta Office Market. The North 
Central submarket, the location of the Perimeter Center Portfolio, had 
approximately 20.2 million square feet of office space. The following table 
sets forth the vacancy rates and Net Absorption for the North Central Atlanta 
Office Market from 1991 through March 1996. 


 Period                     Vacancy           Net Absorption 
 ------                     -------           -------------- 
                                         (in millions of square feet) 
1991                          19.6%                .6 
1992                          16.8%                .5 
1993                          11.7%               1.0 
1994                           8.7%                .6 
1995                           6.0%                .7 
January--March 1996            5.3%                .2 


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

Sources: CB/Torto Wheaton 1991 through 1994; Jamison Research 1995 and 1996 

Property Descriptions 

   The following is a description of the buildings located in the Perimeter 
Center Portfolio. The Company owns a 100% fee interest in each of the 
Properties in the Perimeter Center Portfolio. 

                                         Year      Rentable Area 
                                        Built/       in Square 
Property                              Renovated        Feet 
- --------                              ---------    ------------- 
North Terraces                           1984          492,845 
South Terraces                           1986          494,513 
8,10,12,14,16 Perimeter Center East      1970           64,998 
20,22,24,26 Perimeter Center East        1973           69,727 
28,30,32 Perimeter Center East           1974          104,816 
41 Perimeter Center East                 1974           92,021 
47 Perimeter Center East                 1974           92,021 
50 Perimeter Center East                 1981            6,300 
53 Perimeter Center East                 1972           90,505 
56 Perimeter Center East                 1977           93,625 
64 Perimeter Center East                 1971          183,037 
64A Perimeter Center East                1985          372,498 
70,72,74,76 Perimeter Center East        1972           61,932 
125 Perimeter Center West                1972          223,059 
219 Perimeter Center Parkway             1979          127,697 
223 Perimeter Center Parkway             1978          127,823 
245 Perimeter Center Parkway             1981          229,217 
301 Perimeter Center North               1982          151,416 
303 Perimeter Center North               1989          162,256 
Park Place Shopping Center               1979           61,830 
                                                     ----------- 
    Total                                            3,302,136 
                                                     =========== 

                                     S-27
<PAGE>

Base Rents and Historic Net Rents 


   The following charts show the average annual Base Rent and the average 
annual Historic Net Rent (as defined below) per square foot for each of the 
Properties in the Perimeter Center Portfolio. Historic Net Rent is Base Rent 
plus tenant payments on account of real estate tax and operating expense 
escalation, less total operating expenses and real estate taxes. 


<TABLE>
<CAPTION>
                                                    Average Annual Base Rents 
                                     ----------------------------------------------------- 
                                                                                    As of 
Property                               1991     1992     1993     1994     1995    6/30/96 
- --------                               ----     ----     ----     ----     ----    ------- 
                                                        (per square foot) 
<S>                                  <C>      <C>      <C>      <C>      <C>        <C>    
North Terraces                       $16.89   $15.55   $17.94   $17.87   $18.06     $19.66 
South Terraces                        19.87    18.78    17.08    18.59    20.70      20.07 
8,10,12,14,16 Perimeter Center 
  East                                12.29    14.32    13.51    13.91    11.63      13.86 
20,22,24,26 Perimeter Center East     12.62    13.48    12.92    11.75    13.11      14.53 
28,30,32 Perimeter Center East        13.52    13.01    10.34    10.42    12.52      12.80 
41 Perimeter Center East              13.09    14.45    14.76    14.29    13.70      14.57 
47 Perimeter Center East              16.13    16.13    15.84    14.94    15.39      14.79 
50 Perimeter Center East               6.08     6.00     6.19     6.27     6.37       6.62 
53 Perimeter Center East               8.72    13.44    13.57    13.62    15.02      15.45 
56 Perimeter Center East              11.90    11.76    11.27    11.23    11.77      11.62 
64 Perimeter Center East               5.34     5.34     5.34     5.34     5.34       5.34 
64A Perimeter Center East             18.71    19.01    19.31    19.62    19.91      20.06 
70,72,74,76 Perimeter Center East     14.89    13.74    13.90    14.76    16.02      15.11 
125 Perimeter Center West              4.10     4.10     4.10     4.10     4.11       4.10 
219 Perimeter Center Parkway          14.18    11.79    14.89    16.88    15.62      15.50 
223 Perimeter Center Parkway          13.75     6.76     8.08     8.62    11.33      11.25 
245 Perimeter Center Parkway          15.26    15.80    15.99    16.17    16.36      17.66 
301 Perimeter Center North            15.41    17.17    17.17    17.73    17.80      18.47 
303 Perimeter Center North            16.96    21.06    19.70    20.44    21.06      20.54 
Park Place Shopping Center            17.80    18.86    19.78    19.32    25.53      16.20 
                                     ------   ------   ------   ------   ------     ------ 
    Weighted Average                 $14.81   $14.57   $14.81   $15.18   $15.89     $16.05 
                                     ======   ======   ======   ======   ======     ====== 
</TABLE>

<TABLE>
<CAPTION>
                                                Average Annual Historic Net Rents 
                                       --------------------------------------------------- 
                                                                                       As of 
Property                            1991(1)  1992(1)   1993(1)   1994(1)  1995(1)   6/30/96 (2) 
- --------                            -------  -------   -------   -------  -------   -----------
                                                       (per square foot)
<S>                                  <C>      <C>       <C>       <C>      <C>        <C>    
North Terraces                       $ 9.59   $ 8.67    $10.70    $10.52   $ 9.38     $13.37 
South Terraces                        13.61    12.28      9.17     11.40    12.83      13.21 
8,10,12,14,16 Perimeter Center East    5.60     7.17      6.09      5.03     4.47       8.70 
20,22,24,26 Perimeter Center East      6.35     6.86      6.12      5.15     4.72       9.08 
28,30,32 Perimeter Center East         7.08     6.78      2.63      4.31     5.66       8.02 
41 Perimeter Center East               5.97     7.63      6.55      6.16     5.59       9.09 
47 Perimeter Center East               9.71     8.85      9.09      7.61     7.28       9.30 
50 Perimeter Center East               6.08     6.00      6.19      6.27     6.37       6.62 
53 Perimeter Center East               1.72     7.07      7.88      7.45     8.26      10.47 
56 Perimeter Center East               8.03     8.03      7.16      7.57     6.65       7.83 
64 Perimeter Center East               2.83     3.33      3.29      3.24     3.20       2.98 
64A Perimeter Center East             14.69    15.75     15.59     15.80    15.09      17.32 
70,72,74,76 Perimeter Center East      8.04     6.95      7.13      7.48     8.05      10.17 
125 Perimeter Center West              3.41     3.56      3.33      3.31     3.04       3.16 
219 Perimeter Center Parkway           7.55     5.79      7.68     10.32     8.91      10.13 
223 Perimeter Center Parkway           6.35     0.73      1.63      1.92     3.71      11.08 
245 Perimeter Center Parkway          10.38     8.83      8.48      8.21     8.45      11.50 
301 Perimeter Center North             8.97    11.09      9.91     10.58     9.85      11.82 
303 Perimeter Center North            10.60    15.45     13.32     13.55    13.33      14.19 
Park Place Shopping Center            11.31    12.29     13.38     12.60    16.50      12.93 
                                     ------   ------    ------    ------   ------     ------ 
    Weighted Average                 $ 9.41   $ 9.26    $ 8.92    $ 9.28   $ 9.28     $11.25 
                                     ======   ======    ======    ======   ======     ====== 
</TABLE>

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

(1) Calculated as Historic Net Rent 

(2) Calculated as Net Effective Rent 


                                     S-28
<PAGE>

Occupancy Rates 

   The following chart sets forth the occupancy rate, expressed as a 
percentage, for each of the Properties located in the Perimeter Center 
Portfolio for each of 1990 through 1995, and as of June 30, 1996. 

<TABLE>
<CAPTION>
                                                                   Occupancy Rate 
                                          ----------------------------------------------------- 
                                                                                         As of 
Property                                   1991     1992     1993     1994     1995     6/30/96 
- --------                                  ------   ------   ------   ------   ------    -------- 
<S>                                        <C>      <C>      <C>      <C>      <C>        <C>
North Terraces                              86%      92%      96%      96%      84%        98% 
South Terraces                              90%      84%      88%      92%      96%        98% 
8,10,12,14,16 Perimeter Center East         70%      69%      61%      60%      69%        77% 
20,22,24,26 Perimeter Center East           84%      87%      91%      85%      78%        94% 
28,30,32 Perimeter Center East              70%      65%      61%      83%      85%        94% 
41 Perimeter Center East                    77%      78%      58%      61%      71%        85% 
47 Perimeter Center East                    79%      75%      79%      87%      77%        85% 
50 Perimeter Center East                   100%     100%     100%     100%     100%       100% 
53 Perimeter Center East                    61%      70%      88%      88%      83%        70% 
56 Perimeter Center East                   100%     100%      93%      93%      93%        99% 
64 Perimeter Center East                   100%     100%     100%     100%     100%       100% 
64A Perimeter Center East                  100%     100%     100%     100%     100%       100% 
70,72,74,76 Perimeter Center East           82%      89%      91%      89%      86%        88% 
125 Perimeter Center West                  100%     100%     100%     100%     100%       100% 
219 Perimeter Center Parkway                73%      82%      64%      85%      99%       100% 
223 Perimeter Center Parkway                67%     100%     100%     100%     100%       100% 
245 Perimeter Center Parkway               100%     100%     100%     100%     100%       100% 
301 Perimeter Center North                  99%     100%     100%     100%     100%       100% 
303 Perimeter Center North                 100%      99%     100%     100%     100%       100% 
Park Place Shopping Center                  91%      98%     100%      98%      91%       100% 
                                            ---      ---      ---      ---      ---      ------ 
    Weighted Average                        89%      91%      92%      94%      93%        97% 
                                            ===      ===      ===      ===      ===      ====== 
</TABLE>

                                      S-29
<PAGE>

Lease Expirations 

   The following table sets forth lease expirations (in square feet) for the 
Company's Properties in the Perimeter Center Portfolio. This table does not 
contain information relating to certain ground leases in the Perimeter Center 
Portfolio. 


<TABLE>
<CAPTION>
                                                                      Lease Expirations--Perimeter Center Portfolio 
                                                      ------------------------------------------------------------------------ 
                                                        7/1/96 
                                                          to 
Property                                               12/31/96         1997           1998           1999            2000 
- --------                                              -----------    -----------    -----------    -----------   ------------- 
<S>                         <C>                       <C>            <C>            <C>            <C>             <C>        
North Terraces              square feet (a)               67,524         31,179         18,295         79,666         196,907 
                            % sq. ft. (b)                   13.7%           6.3%           3.7%          16.2%           39.9% 
                            annual rent (c)           $1,441,902       $617,778       $356,293     $1,539,051      $4,131,101 
                            annual rent psf (d)           $21.35         $19.81         $19.47         $19.32          $20.98 
                            tenants (e)                       18              7              7              7              13 

South Terraces              square feet (a)               51,910        183,274        112,362         94,470          38,723 
                            % sq. ft. (b)                   10.5%          37.1%          22.7%          19.1%            7.8% 
                            annual rent (c)           $1,067,901     $4,240,969     $2,096,022     $1,869,454        $860,954 
                            annual rent psf (d)           $20.57         $23.14         $18.65         $19.79          $22.23 
                            tenants (e)                       12             17             19             18               2 

8,10,12,14,16 
  Perimeter                 square feet (a)                3,326         17,880          1,441          4,408           5,169 
 Center East                % sq. ft. (b)                    5.1%          27.5%           2.2%           6.8%            8.0% 
                            annual rent (c)              $44,931       $255,559        $15,592        $70,494         $92,473 
                            annual rent psf (d)           $13.51         $14.29         $10.82         $15.99          $17.89 
                            tenants (e)                        4              7              2              3               1 

20,22,24,26 Perimeter       square feet (a)               10,477          5,185         18,792          9,957          21,059 
 Center East                % sq. ft. (b)                   15.0%           7.4%          27.0%          14.3%           30.2% 
                            annual rent (c)             $134,535        $75,682       $264,081       $160,392        $351,994 
                            annual rent psf (d)           $12.84         $14.60         $14.05         $16.11          $16.71 
                            tenants (e)                        6              5              5              3               1 

28,30,32 Perimeter          square feet (a)                    0          3,788         88,107          2,363           4,152 
 Center East                % sq. ft. (b)                    0.0%           3.6%          83.9%           2.2%            4.0% 
                            annual rent (c)                   $0        $49,883     $1,165,602        $34,500         $67,300 
                            annual rent psf (d)            $0.00         $13.17         $13.23         $14.60          $16.21 
                            tenants (e)                        0              3              5              1               2 

41 Perimeter Center East    square feet (a)                1,876              0         32,308         30,545          13,463 
                            % sq. ft. (b)                    2.0%           0.0%          35.1%          33.2%           14.6% 
                            annual rent (c)               $7,035             $0       $498,448       $468,954        $237,377 
                            annual rent psf (d)            $3.75          $0.00         $15.43         $15.35          $17.63 
                            tenants (e)                        1              0              2              4               2 

47 Perimeter Center East    square feet (a)                2,230          2,756         16,354         14,871          41,904 
                            % sq. ft. (b)                    2.4%           3.0%          17.8%          16.2%           45.5% 
                            annual rent (c)              $32,090        $51,592       $249,373       $225,204        $677,354 
                            annual rent psf (d)           $14.39         $18.72         $15.25         $15.14          $16.16 
                            tenants (e)                        1              1              6              2               6 

50 Perimeter Center East    square feet (a)                    0              0          6,300              0               0 
                            % sq. ft. (b)                    0.0%           0.0%         100.0%           0.0%            0.0% 
                            annual rent (c)                   $0             $0        $61,677             $0              $0 
                            annual rent psf (d)            $0.00          $0.00          $9.79          $0.00           $0.00 
                            tenants (e)                        0              0              1              0               0 

53 Perimeter Center East    square feet (a)                8,017         33,972          4,024         13,746               0 
                            % sq. ft. (b)                    8.9%          37.5%           4.4%          15.2%            0.0% 
                            annual rent (c)             $147,753       $550,392        $63,458       $195,460              $0 
                            annual rent psf (d)           $18.43         $16.20         $15.77         $14.22           $0.00 
                            tenants (e)                        1              3              1              2               0 

56 Perimeter Center East    square feet (a)               86,679              0              0              0           5,742 
                            % sq. ft. (b)                   92.6%           0.0%           0.0%           0.0%            6.1% 
                            annual rent (c)           $1,218,229             $0             $0             $0        $117,768 
                            annual rent psf (d)           $14.05          $0.00          $0.00          $0.00          $20.51 
                            tenants (e)                        2              0              0              0               1 

64 Perimeter Center 
  East                      square feet (a)                    0              0              0              0               0 
                            % sq. ft. (b)                    0.0%           0.0%           0.0%           0.0%            0.0% 
                            annual rent (c)                   $0             $0             $0             $0              $0 
                            annual rent psf (d)            $0.00          $0.00          $0.00          $0.00           $0.00 
                            tenants (e)                        0              0              0              0               0 

64A Perimeter Center 
  East                      square feet (a)                    0              0              0              0               0 
                            % sq. ft. (b)                    0.0%           0.0%           0.0%           0.0%            0.0% 
                            annual rent (c)                   $0             $0             $0             $0              $0 
                            annual rent psf (d)            $0.00          $0.00          $0.00          $0.00           $0.00 
                            tenants (e)                        0              0              0              0               0 

70,72,74,76 Perimeter       square feet (a)                8,460          4,506          3,204         16,423          17,296 
 Center East                % sq. ft. (b)                   13.7%           7.3%           5.2%          26.5%           27.9% 
                            annual rent (c)             $129,020        $61,168        $37,225       $304,919        $310,914 
                            annual rent psf (d)           $15.25         $13.57         $11.62         $18.57          $17.98 
                            tenants (e)                        2              3              3              2               2 
</TABLE>
 
<TABLE>
<CAPTION>
                                                             Lease Expirations--Perimeter Center Portfolio (continued) 
                                                      ------------------------------------------------------------------------ 
                                                                                                                   2005 and 
Property                                                2001           2002           2003           2004           beyond 
- --------                                              ---------      ---------      ---------      ---------      ----------- 
<S>                         <C>                       <C>            <C>            <C>            <C>             <C>        
North Terraces              square feet (a)               68,515        17,990            0              0              2,718 
                            % sq. ft. (b)                   13.9%          3.6%         0.0%           0.0%               0.6% 
                            annual rent (c)           $2,000,355      $423,371           $0             $0                 $0 
                            annual rent psf (d)           $29.20        $23.53        $0.00          $0.00              $0.00 
                            tenants (e)                        6             2            0              0                  1 

South Terraces              square feet (a)                1,430             0            0              0                  0 
                            % sq. ft. (b)                    0.3%          0.0%         0.0%           0.0%               0.0% 
                            annual rent (c)              $38,624            $0           $0             $0                 $0 
                            annual rent psf (d)           $27.01         $0.00        $0.00          $0.00              $0.00 
                            tenants (e)                        1             0            0              0                  0 

8,10,12,14,16 
  Perimeter                 square feet (a)               17,581             0            0              0                  0 
 Center East                % sq. ft. (b)                   27.0%          0.0%         0.0%           0.0%               0.0% 
                            annual rent (c)             $251,651            $0           $0             $0                 $0 
                            annual rent psf (d)           $14.31         $0.00        $0.00          $0.00              $0.00 
                            tenants (e)                        2             0            0              0                  0 

20,22,24,26 Perimeter       square feet (a)                    0             0            0              0                  0 
 Center East                % sq. ft. (b)                    0.0%          0.0%         0.0%           0.0%               0.0% 
                            annual rent (c)                   $0            $0           $0             $0                 $0 
                            annual rent psf (d)            $0.00         $0.00        $0.00          $0.00              $0.00 
                            tenants (e)                        0             0            0              0                  0 

28,30,32 Perimeter          square feet (a)                    0             0            0              0                  0 
 Center East                % sq. ft. (b)                    0.0%          0.0%         0.0%           0.0%               0.0% 
                            annual rent (c)                   $0            $0           $0             $0                 $0 
                            annual rent psf (d)            $0.00         $0.00        $0.00          $0.00              $0.00 
                            tenants (e)                        0             0            0              0                  0 

41 Perimeter Center East    square feet (a)                    0             0            0              0                  0 
                            % sq. ft. (b)                    0.0%          0.0%         0.0%           0.0%               0.0% 
                            annual rent (c)                   $0            $0           $0             $0                 $0 
                            annual rent psf (d)            $0.00         $0.00        $0.00          $0.00              $0.00 
                            tenants (e)                        0             0            0              0                  0 

47 Perimeter Center East    square feet (a)                    0             0            0              0                  0 
                            % sq. ft. (b)                    0.0%          0.0%         0.0%           0.0%               0.0% 
                            annual rent (c)                   $0            $0           $0             $0                 $0 
                            annual rent psf (d)            $0.00         $0.00        $0.00          $0.00              $0.00 
                            tenants (e)                        0             0            0              0                  0 

50 Perimeter Center East    square feet (a)                    0             0            0              0                  0 
                            % sq. ft. (b)                    0.0%          0.0%         0.0%           0.0%               0.0% 
                            annual rent (c)                   $0            $0           $0             $0                 $0 
                            annual rent psf (d)            $0.00         $0.00        $0.00          $0.00              $0.00 
                            tenants (e)                        0             0            0              0                  0 

53 Perimeter Center East    square feet (a)                3,586             0            0              0                  0 
                            % sq. ft. (b)                    4.0%          0.0%         0.0%           0.0%               0.0% 
                            annual rent (c)              $72,365            $0           $0             $0                 40 
                            annual rent psf (d)           $20.18         $0.00        $0.00          $0.00              $0.00 
                            tenants (e)                        1             0            0              0                  0 

56 Perimeter Center East    square feet (a)                    0             0            0              0                  0 
                            % sq. ft. (b)                    0.0%          0.0%         0.0%           0.0%               0.0% 
                            annual rent (c)                   $0            $0           $0             $0                 $0 
                            annual rent psf (d)            $0.00         $0.00        $0.00          $0.00              $0.00 
                            tenants (e)                        0             0            0              0                  0 

64 Perimeter Center East    square feet (a)              183,037             0            0              0                  0 
                            % sq. ft. (b)                  100.0%          0.0%         0.0%           0.0%               0.0% 
                            annual rent (c)           $1,746,388            $0           $0             $0                 $0 
                            annual rent psf (d)            $9.54         $0.00        $0.00          $0.00              $0.00 
                            tenants (e)                        1             0            0              0                  0 

64A Perimeter Center East   square feet (a)                    0             0            0              0            372,498 
                            % sq. ft. (b)                    0.0%          0.0%         0.0%           0.0%             100.0% 
                            annual rent (c)                   $0            $0           $0             $0         $9,166,954 
                            annual rent psf (d)            $0.00         $0.00        $0.00          $0.00             $24.61 
                            tenants (e)                        0             0            0              0                  1 

70,72,74,76 Perimeter       square feet (a)                4,636             0            0              0                  0 
 Center East                % sq. ft. (b)                    7.5%          0.0%         0.0%           0.0%               0.0% 
                            annual rent (c)              $81,315            $0           $0             $0                 $0 
                            annual rent psf (d)           $17.54         $0.00        $0.00          $0.00              $0.00 
                            tenants (e)                        1             0            0              0                  0 
</TABLE>

(Notes on following page) 

                                      S-30
<PAGE>


<TABLE>
<CAPTION>
                                                             Lease Expirations--Perimeter Center Portfolio (continued) 
                                                      ------------------------------------------------------------------------ 
                                                        7/1/96 
                                                          to 
Property                                               12/31/96         1997           1998           1999            2000 
- --------                                              ---------      ---------      ---------      ---------      ----------- 
<S>                         <C>                       <C>            <C>            <C>           <C>              <C>        
125 Perimeter Center        square feet (a)                    0              0              0              0               0 
 West (f)                   % sq. ft. (b)                    0.0%           0.0%           0.0%           0.0%            0.0% 
                            annual rent (c)                   $0             $0             $0             $0              $0 
                            annual rent psf (d)            $0.00          $0.00          $0.00          $0.00           $0.00 
                            tenants (e)                        0              0              0              0               0 
219 Perimeter Center        square feet (a)                7,845          3,886         70,381         26,574           3,375 
 Parkway                    % sq. ft. (b)                    6.1%           3.0%          55.1%          20.8%            2.6% 
                            annual rent (c)              133,261        $72,163     $1,119,904       $409,172         $50,558 
                            annual rent psf (d)           $16.99         $18.57         $15.91         $15.40          $14.98 
                            tenants (e)                        2              1              4              1               1 
223 Perimeter Center        square feet (a)                    0              0              0              0               0 
 Parkway                    % sq. ft. (b)                    0.0%           0.0%           0.0%           0.0%            0.0% 
                            annual rent (c)                   $0             $0             $0             $0              $0 
                            annual rent psf (d)            $0.00          $0.00          $0.00          $0.00           $0.00 
                            tenants (e)                        0              0              0              0               0 
245 Perimeter Center        square feet (a)                    0              0              0              0               0 
 Parkway                    % sq. ft. (b)                    0.0%           0.0%           0.0%           0.0%            0.0% 
                            annual rent (c)                   $0             $0             $0             $0              $0 
                            annual rent psf (d)            $0.00          40.00          $0.00          $0.00           $0.00 
                            tenants (e)                        0              0              0              0               0 
301 Perimeter Center        square feet (a)                    0              0              0        151,416               0 
 North                      % sq. ft. (b)                    0.0%           0.0%           0.0%         100.0%            0.0% 
                            annual rent (c)                   $0             $0             $0     $2,677,440              $0 
                            annual rent psf (d)            $0.00          $0.00          $0.00         $17.68           $0.00 
                            tenants (e)                        0              0              0              1               0 
303 Perimeter Center        square feet (a)                    0              0              0        162,256               0 
 North                      % sq. ft. (b)                    0.0%           0.0%           0.0%         100.0%            0.0% 
                            annual rent (c)                   $0             $0             $0     $3,592,679              $0 
                            annual rent psf (d)            $0.00          $0.00          $0.00         $22.14           $0.00 
                            tenants (e)                        0              0              0              2               0 
Park Place Shopping 
  Center                    square feet (a)                    0          2,489          5,955         21,720          18,038 
                            % sq. ft. (b)                    0.0%           4.0%           9.6%          35.1%           29.2% 
                            annual rent (c)                   $0        $47,191       $107,728       $386,231        $367,960 
                            annual rent psf (d)            $0.00         $18.96         $18.09         $17.78         4420.40 
                            tenants (e)                        0              1              4              5               4 
                            ----------------------      ---------      ---------      ---------      ---------      ----------- 
TOTAL                       square feet (a)              248,344        288,915        377,523        628,415         365,828 
                            % sq. ft. (b)                    7.5%           8.7%          11.4%          19.0%           11.1% 
                            annual rent (c)           $4,356,656     $6,022,378     $6,035,402    $11,933,950      $7,265,752 
                            annual rent psf (d)           $17.54         $20.84         $15.99         $18.99          $19.86 
                            tenants (e)                       49             48             59             51              35 
</TABLE>

 
<TABLE>
<CAPTION>
                                                             Lease Expirations--Perimeter Center Portfolio (continued) 
                                                      ------------------------------------------------------------------------ 
                                                                                                                   2005 and 
Property                                                 2001          2002           2003           2004           beyond 
- --------                                              ---------      ---------      ---------      ---------      ----------- 
<S>                         <C>                       <C>             <C>             <C>          <C>                <C>        
125 Perimeter Center        square feet (a)                     0            0            0           223,059             0 
 West (f)                   % sq. ft. (b)                     0.0%         0.0%         0.0%            100.0%          0.0% 
                            annual rent (c)                    $0           $0           $0        $1,001,603            $0 
                            annual rent psf (d)             $0.00        $0.00        $0.00             $4.49         $0.00 
                            tenants (e)                         0            0            0                 1             0 

219 Perimeter Center        square feet (a)                15,202            0            0                 0             0 
 Parkway                    % sq. ft. (b)                    11.9%         0.0%         0.0%              0.0%          0.0% 
                            annual rent (c)               286,986           $0           $0                $0            $0 
                            annual rent psf (d)            $18.88        $0.00        $0.00             $0.00         $0.00 
                            tenants (e)                         1            0            0                 0             0 

223 Perimeter Center        square feet (a)               127,823            0            0                 0             0 
 Parkway                    % sq. ft. (b)                   100.0%         0.0%         0.0%              0.0%          0.0% 
                            annual rent (c)            $2,428,637           $0           $0                $0            $0 
                            annual rent psf (d)            $19.00        $0.00        $0.00             $0.00         $0.00 
                            tenants (e)                         1            0            0                 0             0 

245 Perimeter Center        square feet (a)               229,217            0            0                 0             0 
 Parkway                    % sq. ft. (b)                   100.0%         0.0%         0.0%              0.0%          0.0% 
                            annual rent (c)            $4,286,082           $0           $0                $0            $0 
                            annual rent psf (d)            $18.70        $0.00        $0.00             $0.00         $0.00 
                            tenants (e)                         1            0            0                 0             0 

301 Perimeter Center        square feet (a)                     0            0            0                 0             0 
 North                      % sq. ft. (b)                     0.0%         0.0%         0.0%              0.0%          0.0% 
                            annual rent (c)                    $0           $0           $0                $0            $0 
                            annual rent psf (d)             $0.00        $0.00        $0.00             $0.00         $0.00 
                            tenants (e)                         0            0            0                 0             0 

303 Perimeter Center        square feet (a)                     0            0            0                 0             0 
 North                      % sq. ft. (b)                     0.0%         0.0%         0.0%              0.0%          0.0% 
                            annual rent (c)                    $0           $0           $0                $0            $0 
                            annual rent psf (d)             $0.00        $0.00        $0.00             $0.00         $0.00 
                            tenants (e)                         0            0            0                 0             0 

Park Place Shopping 
  Center                    square feet (a)                 1,854            0            0                 0        11,774 
                            % sq. ft. (b)                     3.0%         0.0%         0.0%              0.0%         19.0% 
                            annual rent (c)               $52,301           $0           $0                $0      $239,393 
                            annual rent psf (d)            $28.21        $0.00        $0.00             $0.00        $20.33 
                            tenants (e)                         1            0            0                 0             2 
                            ----------------------      ---------      ---------      ---------      ---------      ----------- 
TOTAL                       square feet (a)               652,881       17,990            0           223,059       386,990 
                            % sq. ft. (b)                    19.8%         0.5%         0.0%              6.8%         11.7% 
                            annual rent (c)           $11,244,705     $423,371           $0        $1,001,603    $9,406,347 
                            annual rent psf (d)            $17.22       $23.53        $0.00             $4.49        $24.31 
                            tenants (e)                        16            2            0                 1             4 
</TABLE>


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

(a) Total area in square feet covered by such leases 

(b) Percentage of total square feet represented by such leases 


(c) Annualized expiring base rental income represented by such leases in the 
    year of expiration plus 1995 tenant payments on account of real estate 
    and operating escalations, except leases with CPI increases in lieu of 
    expense recoveries 



(d) Calculated as annual rent divided by square feet 


(e) The number of tenants whose leases will expire 

(f) 125 Perimeter Center is reflected as a 2004 expiration; although the 
    lease expires in 1999, the tenant has an option to extend for five years 
    in 1999 at a rental rate that is significantly below market 

                                      S-31
<PAGE>
 
The Greater Boston Suburban Office Market 

Market Information 

   As of March 1996, there were approximately 44 million square feet of 
private sector office space in the Greater Boston Suburban Office Market. Of 
the ten Properties located in the Greater Boston Suburban Office Market, 
eight are located in the Route 128/Mass. Pike submarket, one (Westwood 
Business Centre) is located in the South submarket and one (Crosby Corporate 
Center) is located in the Northwest submarket. The following tables set forth 
the vacancy rates for the Route 128/Mass. Pike, South, and Northwest 
submarkets from December 1991 through March 1996. 

      Route 128/ 
 Mass. Pike Submarket       South Submarket       Northwest Submarket 
- ----------------------     -------------------   --------------------- 
             Vacancy                Vacancy 
  Date        Rate       Date        Rate       Date     Vacancy Rate 
- -------     -----------    ----    -----------    ----   ------------- 
12/91          18.5%     12/91        17.4%     12/91        23.1% 
12/92          18.5%     12/92        13.5%     12/92        21.7% 
12/93          11.6%     12/93        12.3%     12/93        18.0% 
12/94          10.6%     12/94         9.4%     12/94        16.2% 
12/95           9.6%     12/95         9.2%     12/95        13.7% 
3/96            8.0%      3/96         8.0%      3/96        15.5% 

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

Source: Spaulding & Slye Office Market Reports 1990 through April 1996. 

   Spaulding & Slye reports that Net Absorption for the Route 128/Mass. Pike 
submarket was 100,000 square feet in both 1995 and 1994. For the South 
submarket, Spaulding & Slye reports that Net Absorption was 100,000 square 
feet in 1995 and 300,000 square feet in 1994. In the Northwest submarket, 
Spaulding & Slye reports Net Absorption for 1995 and 1994 of 300,000 square 
feet and 100,000 square feet, respectively. 

Property Descriptions 

   The following chart describes the Company's Properties located in the 
Greater Boston Suburban Office Market. The Company owns a 100% fee interest 
in each Property located in the Greater Boston Suburban Office Market. 


                                                     Rentable 
                                         Year          Area 
                                        Built/      in Square      No. of 
Property                              Renovated        Feet       Stories 
- ----------------------------------     ---------    -----------   -------- 
Wellesley Office Park: 
 65 William Street, Building One         1963          29,502         3 
 60 William Street, Building Two         1966          49,826         4 
 55 William Street, Building Three       1968          52,636         4 
 40 William Street, Building Four        1970          71,904         4 
 20 William Street, Building Five        1973         129,000         4 
 45 William Street, Building Six         1976         155,718         4 
 80 William Street, Building Seven       1984          71,324         4 
 100 William Street, Building 
  Eight                                  1968          39,424         3 
Westwood Business Centre                 1985         160,400         3 
Crosby Corporate Center                  1996         336,000        (a) 
                                                     --------- 
    Total                                           1,095,734 
                                                     ========= 


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

(a) Crosby Corporate Center is a six building complex with one and two story 
    buildings. 

                                      S-32
<PAGE>

Base Rents and Net Effective Rents 


   The following charts set forth the average annual Base Rents and the 
average annual Net Effective Rents per square foot for each of the Company's 
Properties located in the Greater Boston Suburban Office Market. 

<TABLE>
<CAPTION>
                                                         Average Annual Base Rents 
                                        ----------------------------------------------------------- 
                                                                                            As of 
Property                                 1991     1992     1993       1994        1995     6/30/96 
- ------------------------------------     -----    -----    -----   -----------    -----   -------- 
<S>                                    <C>      <C>      <C>         <C>         <C>       <C>    
Wellesley Office Park: 
   65 William Street, Building One     $18.98   $21.45   $20.97      $22.00      $22.60    $ 23.69 
   60 William Street, Building Two      26.24    22.04    16.62       19.26       19.39      20.59 
   55 William Street, Building Three    21.82    25.41    23.25       22.06       22.03      22.54 
   40 William Street, Building Four     20.20    23.33    22.89       22.28       23.08      23.75 
   20 William Street, Building Five     23.20    22.52    21.20       21.90       22.96      23.73 
   45 William Street, Building Six      17.03    15.65    15.46       16.52       16.28      22.77 
   80 William Street, Building Seven    38.37    37.71    37.34       25.00 (1)   25.00      25.00 
   100 William Street, Building Eight 
     (2)                                   --       --       --          --       23.00      23.00 
Westwood Business Centre (2)               --       --       --          --       18.46      19.40 
Crosby Corporate Center (2)                --       --       --          --         --       15.62 
                                         -----    -----    -----   -----------    -----   -------- 
    Weighted Average                   $22.99   $22.96   $21.63      $21.03      $20.50    $20.35 
                                         =====    =====    =====   ===========    =====   ======== 
</TABLE>

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

(1) This reduction in Base Rent is attributable to the execution of a new 
    lease with the tenant occupying this Property for an 11-year term 
    commencing January 1, 1994. 

(2) The 100 William Street Property and Westwood Business Centre were 
    acquired by the Company subsequent to the Initial Offering and, 
    consequently, information prior to the date of acquisition is 
    unavailable. The Crosby Corporate Center was redeveloped by the Company 
    from research/development space to Class A office space and, 
    consequently, historical information prior to such redevelopment is not 
    comparable. 

<TABLE>
<CAPTION>
                                                    Average Annual Net Effective Rents 
                                        ----------------------------------------------------------- 
                                                                                            As of 
Property                                 1991     1992     1993       1994        1995     6/30/96 
- ------------------------------------     -----    -----    -----   -----------    -----   -------- 
<S>                                    <C>      <C>      <C>         <C>         <C>       <C>
Wellesley Office Park: 
   65 William Street, Building One     $10.17   $12.40   $12.70      $13.19      $14.02    $ 15.47 
   60 William Street, Building Two      12.69    13.30     9.36       11.26       11.58      12.97 
   55 William Street, Building Three    12.90    16.36    14.86       13.86       13.92      14.65 
   40 William Street, Building Four     11.47    13.18    16.17       14.07       14.77      15.76 
   20 William Street, Building Five     12.45    12.38    11.92       13.04       14.11      15.10 
   45 William Street, Building Six      10.95     9.06     9.07       10.84       12.65      15.32 
   80 William Street, Building Seven    31.02    31.10    31.35       21.38 (1)   19.47      20.38 
   100 William Street, Building Eight 
     (2)                                   --       --       --          --       15.50      15.50 
Westwood Business Centre (2)               --       --       --          --       11.41      11.38 
Crosby Corporate Center (2)                --       --       --          --          --      13.35 
                                         -----    -----    -----   -----------    -----   -------- 
    Weighted Average                   $14.28   $14.55   $14.23      $13.57      $13.66    $14.35 
                                         =====    =====    =====   ===========    =====   ======== 
</TABLE>

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

(1) This reduction in Net Effective Rent is attributable to the execution of 
    a new lease with the tenant occupying this Property for an 11-year term 
    commencing January 1, 1994. 

(2) The 100 William Street Property and Westwood Business Centre were 
    acquired by the Company subsequent to the Initial Offering and, 
    consequently, information prior to the date of acquisition is 
    unavailable. The Crosby Corporate Center was redeveloped by the Company 
    from research/development space to Class A office space and, 
    consequently, historical information prior to such redevelopment is not 
    comparable. 



                                      S-33
<PAGE>
 
Occupancy Rates 


   The following chart sets forth the occupancy rate, expressed as a 
percentage, for each of the Company's Properties located in the Greater 
Boston Suburban Office Market. 

<TABLE>
<CAPTION>
                                                                Occupancy Rate 
                                            ------------------------------------------------------- 
                                                                                           As of 
Property                                     1991     1992     1993     1994     1995     6/30/96 
- ----------------------------------------     -----    -----    -----    -----    -----   ---------- 
<S>                                         <C>       <C>      <C>      <C>      <C>        <C>
Wellesley Office Park: 
   65 William Street, Building One            97%     100%     100%      94%     100%        87% 
   60 William Street, Building Two            98%      96%     100%     100%      98%        93% 
   55 William Street, Building Three         100%      91%      96%     100%     100%       100% 
   40 William Street, Building Four          100%      97%     100%     100%      93%        94% 
   20 William Street, Building Five           95%      95%      97%      97%      97%        97% 
   45 William Street, Building Six            97%      91%      90%      99%      98%        73% 
   80 William Street, Building Seven         100%     100%     100%     100%     100%       100% 
   100 William Street, Building Eight (1)     --       --       --       --      100%       100% 
Westwood Business Centre (1)                  --       --       --       --       99%        99% 
Crosby Corporate Center (1)                   --       --       --       --       --         48% (2) 
                                             -----    -----    -----    -----    -----   ---------- 
    Weighted Average                          98%      95%      97%      99%      98%        79% (3) 
                                             =====    =====    =====    =====    =====   ========== 
</TABLE>

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

(1) The 100 William Street Property and Westwood Business Centre were 
    acquired by the Company subsequent to the Initial Offering and, 
    consequently, information prior to the date of acquisition is 
    unavailable. The Crosby Corporate Center was redeveloped by the Company 
    from research/development space to Class A office space and, 
    consequently, historical information prior to such development is not 
    comparable. 

(2) This Property is approximately 88% leased with occupancy of new tenants
    scheduled for August 1996.

(3) Occupancy rate information does not incorporate the effect of signed 
    leases in place at Crosby Corporate Center. If the effect of such leases 
    were considered, the weighted average occupancy rate would be 
    approximately 91%. 


                                      S-34
<PAGE>
 
Lease Expirations 

   The following table sets forth lease expirations (in square feet) for each 
of the Company's Properties in the Greater Boston Suburban Office Market. 


<TABLE>
<CAPTION>
                                                              Lease Expirations--Greater Boston Suburban Office Market 
                                                      ------------------------------------------------------------------------ 
                                                        7/1/96 
                                                          to 
Property                                               12/31/96         1997           1998           1999            2000 
 ----------------------    -----------------------    -----------    -----------    -----------    -----------   ------------- 
<S>                        <C>                        <C>            <C>            <C>            <C>             <C>
65 William Street           square feet(a)                 5,864          3,769          1,103          2,274           3,429 
Building One                % sq. ft.(b)                    19.9%          12.8%           3.7%           7.7%           11.6% 
                            annual rent(c)              $129,947        $89,525        $23,449        $52,302         $88,047 
                            psf(d)                        $22.16         $23.75         $21.26         $23.00          $25.68 
                            tenants(e)                         3              4              1              1               2 
60 William Street           square feet(a)                     0              0         18,457          2,348          23,207 
Building Two                % sq. ft.(b)                     0.0%           0.0%          34.8%           4.4%           43.7% 
                            annual rent(c)                   $ 0             $0       $357,117        $54,021        $502,736 
                            psf(d)                         $0.00          $0.00         $19.35         $23.01          $21.66 
                            tenants(e)                         0              0              3              1               3 
55 William Street           square feet(a)                 8,757         16,415         10,413          2,394               0 
Building Three              % sq. ft.(b)                    15.9%          29.8%          18.9%           4.3%            0.0% 
                            annual rent(c)              $191,290       $378,606       $229,612        $61,636              $0 
                            psf(d)                        $21.84         $23.06         $22.05         $25.75           $0.00 
                            tenants(e)                         3              3              2              2               0 
40 William Street           square feet                    6,539         23,705              0          9,099               0 
Building Four               % sq. ft.(b)                     8.8%          32.0%           0.0%          12.3%            0.0% 
                            annual rent(c)              $146,459       $531,845             $0       $211,217              $0 
                            psf(d)                        $22.40         $22.44          $0.00         $23.21           $0.00 
                            tenants(e)                         3              2              0              2               0 
20 William Street           square feet                    5,820         21,707         35,542          7,634          32,647 
Building Five               % sq. ft.(b)                     4.5%          16.8%          27.6%           5.9%           25.3% 
                            annual rent(c)              $140,936       $505,925       $803,384       $189,449        $830,062 
                            psf(d)                        $24.22         $23.31         $22.60         $24.82          $25.43 
                            tenants(e)                         2              8             11              3               8 
45 William Street           square feet(a)                10,939         13,200              0              0               0 
Building Six                % sq. ft.(b)                     6.9%           8.3%           0.0%           0.0%            0.0% 
                            annual rent(c)              $256,376       $271,443             $0             $0              $0 
                            psf(d)                        $23.44         $20.56          $0.00          $0.00           $0.00 
                            tenants(e)                         5              1              0              0               0 
80 William Street           square feet(a)                     0              0              0              0               0 
Building Seven              % sq. ft.(b)                     0.0%           0.0%           0.0%           0.0%            0.0% 
                            annual rent(c)                    $0             $0             $0             $0              $0 
                            psf(d)                         $0.00          $0.00          $0.00          $0.00           $0.00 
                            tenants(e)                         0              0              0              0               0 
100 William Street          square feet(a)                39,424              0              0              0               0 
Building Eight              % sq. ft.(b)                   100.0%           0.0%           0.0%           0.0%            0.0% 
                            annual rent(c)              $906,752             $0             $0             $0              $0 
                            psf(d)                        $23.00          $0.00          $0.00          $0.00           $0.00 
                            tenants(e)                         1              0              0              0               0 
Westwood                    square feet(a)                 4,085         24,588          3,500         18,784          10,467 
                            % sq. ft.(b)                     2.5%          15.3%           2.2%          11.7%            6.5% 
                            annual rent(c)               $87,030       $565,381        $67,453       $379,447        $217,122 
                            psf(d)                        $21.30         $22.99         $19.27         $20.20          $20.74 
                            tenants(e)                         2              2              1              6               3 
Crosby Corporate 
  Center                    square feet(a)                     0              0              0         40,500               0 
                            % sq. ft(b)                      0.0%           0.0%           0.0%          12.1%            0.0% 
                            annual rent(c)                    $0             $0             $0       $416,287              $0 
                            psf(d)                         $0.00          $0.00          $0.00         $10.28           $0.00 
                            tenants(e)                         0              0              0              1               0 
                                                        ---------      ---------      ---------      ---------      ----------- 
TOTAL                       square feet(a)                81,428        103,384         69,015         83,033          69,750 
SUBURBAN                    % sq. ft.(b)                     7.4%           9.3%           6.2%           7.5%            6.3% 
                            annual rent(c)            $1,858,790     $2,342,724     $1,481,015     $1,364,359      $1,637,966 
                            psf(d)                        $22.83         $22.66         $21.46         $16.43          $23.48 
                            tenants(e)                        19             20             18             16              16 
</TABLE>

<TABLE>
<CAPTION>
                                                              Lease Expirations--Greater Boston Suburban Office Market 
                                                      ------------------------------------------------------------------------ 
                                                                                                                    2005 and 
Property                                                 2001           2002           2003           2004           beyond 
- --------                                                 ----           ----           ----           ----           ------ 
<S>                         <C>                       <C>             <C>            <C>           <C>             <C>
65 William Street           square feet(a)                 5,794         3,874              0               0               0 
Building One                % sq. ft.(b)                    19.6%         13.1%           0.0%            0.0%            0.0% 
                            annual rent(c)              $145,935       $92,949             $0              $0              $0 
                            psf(d)                        $25.19        $23.99          $0.00           $0.00           $0.00 
                            tenants(e)                         2             2              0               0               0 
60 William Street           square feet(a)                 5,914             0              0               0               0 
Building Two                % sq. ft.(b)                    11.1%          0.0%           0.0%            0.0%            0.0% 
                            annual rent(c)              $155,583            $0             $0              $0              $0 
                            psf(d)                        $26.31         $0.00          $0.00           $0.00           $0.00 
                            tenants(e)                         2             0              0               0               0 
55 William Street           square feet(a)                 4,657             0              0          12,470               0 
Building Three              % sq. ft.(b)                     8.5%          0.0%           0.0%           22.6%            0.0% 
                            annual rent(c)              $130,646            $0             $0        $294,761              $0 
                            psf(d)                        $28.05         $0.00          $0.00          $23.64           $0.00 
                            tenants(e)                         1             0              0               1               0 
40 William Street           square feet                    8,374        22,003              0               0               0 
Building Four               % sq. ft.(b)                    11.3%         29.7%           0.0%            0.0%            0.0% 
                            annual rent(c)              $217,739      $572,078             $0              $0              $0 
                            psf(d)                        $26.00        $26.00          $0.00           $0.00           $0.00 
                            tenants(e)                         1             1              0               0               0 
20 William Street           square feet                    9,715        12,800              0               0               0 
Building Five               % sq. ft.(b)                     7.5%          9.9%           0.0%            0.0%            0.0% 
                            annual rent(c)              $248,885      $321,671             $0              $0              $0 
                            psf(d)                        $25.62        $25.13          $0.00           $0.00           $0.00 
                            tenants(e)                         3             1              0               0               0 
45 William Street           square feet(a)                     0             0         15,001          21,700          56,180 
Building Six                % sq. ft.(b)                     0.0%          0.0%           9.6%           13.7%           35.5% 
                            annual rent(c)                    $0            $0       $397,527         526,324      $1,677,017 
                            psf(d)                         $0.00         $0.00         $26.50          $24.25          $29.85 
                            tenants(e)                         0             0              1               1               2 
80 William Street           square feet(a)                     0             0              0               0          71,324 
Building Seven              % sq. ft.(b)                     0.0%          0.0%           0.0%            0.0%          100.0% 
                            annual rent(c)                    $0            $0             $0              $0      $2,190,897 
                            psf(d)                         $0.00         $0.00          $0.00           $0.00          $30.72 
                            tenants(e)                         0             0              0               0               1 
100 William Street          square feet(a)                     0             0              0               0               0 
Building Eight              % sq. ft.(b)                     0.0%          0.0%           0.0%            0.0%            0.0% 
                            annual rent(c)                    $0            $0             $0              $0              $0 
                            psf(d)                         $0.00         $0.00          $0.00           $0.00           $0.00 
                            tenants(e)                         0             0              0               0               0 
Westwood                    square feet(a)                33,841             0              0          62,972               0 
                            % sq. ft.(b)                    21.1%          0.0%           0.0%           39.3%            0.0% 
                            annual rent(c)              $964,300            $0             $0      $1,230,571              $0 
                            psf(d)                        $28.50         $0.00          $0.00          $19.54           $0.00 
                            tenants(e)                         1             0              0               1               0 
Crosby Corporate 
  Center                    square feet(a)                     0             0              0               0         257,114 
                            % sq. ft(b)                      0.0%          0.0%           0.0%            0.0%           76.5% 
                            annual rent(c)                    $0            $0             $0              $0      $5,468,760 
                            psf(d)                         $0.00         $0.00          $0.00           $0.00          $21.27 
                            tenants(e)                         0             0              0               0               4 
                                                        ---------      ---------      ---------      ---------      ----------- 
TOTAL                       square feet(a)                68,295        38,677         15,001          97,142         384,618 
SUBURBAN                    % sq. ft.(b)                     6.2%          3.5%           1.4%            8.8%           34.8% 
                            annual rent(c)            $1,863,089      $986,699       $397,527      $2,051,656      $9,336,674 
                            psf(d)                        $27.28        $25.51         $26.50          $21.12          $24.28 
                            tenants(e)                        10             4              1               3               7 
</TABLE>


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

(a) Total area in square feet covered by such leases 

(b) Percentage of total square feet represented by such leases 


(c) Annualized base rental income represented by such leases in the year of 
    expiration plus 1995 tenant payments on account of real estate tax and 
    operating expense escalations, except leases with CPI increases in lieu 
    of expense recoveries. 

(d) Calculated as annual rent divided by square feet 


(e) The number of tenants whose leases will expire 

                                      S-35
<PAGE>

The Cambridge Office Market 

   As of March 1996, there were approximately 10 million square feet of 
office space in the Cambridge Office Market. The entire Cambridge Office 
Market had a vacancy rate of 4.4% in March 1996 and the East Cambridge 
submarket had a vacancy rate of 4.9% for the same period. Spaulding & Slye 
reports Net Absorption of 210,000 square feet in the Cambridge Office Market 
in 1995 and 100,000 square feet in 1994. There can be no assurance, however, 
that this upward trend will continue. 

   One Canal Park and Ten Canal Park are located in the East Cambridge 
submarket. The average Base Rent rate per square foot and the average annual 
Net Effective Rent per square foot for One Canal Park and Ten Canal Park were 
$16.81 and $13.00, and $20.36 and $12.85, respectively, as of June 30, 1996. 

   One Canal Park. One Canal Park is a four-story, 100,300 rentable square 
foot office building located in the East Cambridge submarket. Construction 
was completed in 1987. The Company owns a 100% fee interest in this Property. 
As of June 30, 1996, One Canal Park was 94% leased. 

   Ten Canal Park. Ten Canal Park is a six-story, 110,000 rentable square 
foot office building located in the East Cambridge submarket. Construction 
was completed in 1987. The Company owns a 100% fee interest in this Property. 
As of June 30, 1996, Ten Canal Park was approximately 88% leased. 

   The following table sets forth lease expirations (in square feet) for each 
of the Company's Properties in the Cambridge Office Market. 


<TABLE>
<CAPTION>
                                                               Lease Expirations--Cambridge Office Market 
                                                 ------------------------------------------------------------------------ 
                                                   7/1/96 
                                                     to 
Property                                          12/31/96        1997           1998           1999            2000 
- -----------------     -----------------------    -----------    -----------    -----------   -----------   ------------- 
<S>                   <C>                         <C>             <C>          <C>             <C>             <C>
One Canal             square feet (a)                    0            0           3,499          1,411             0 
                      % sq. ft. (b)                    0.0%         0.0%            3.5%           1.4%          0.0% 
                      annual rent (c)                   $0           $0        $122,937        $29,968            $0 
                      psf (d)                        $0.00        $0.00          $35.13         $21.24         $0.00 
                      tenants (e)                        0            0               1              1             0 
Ten Canal             square feet (a)               12,331            0               0              0             0 
                      % sq. ft. (b)                   11.1%         0.0%            0.0%           0.0%          0.0% 
                      annual rent (c)             $298,191           $0              $0             $0            $0 
                      psf (d)                       $24.18        $0.00           $0.00          $0.00         $0.00 
                      tenants (e)                        2            0               0              0             0 
                                                  ---------      ---------      ---------      ---------      ----------- 
TOTAL                 square feet (a)               12,331            0           3,499          1,411             0 
                      % sq. ft. (b)                    5.8%         0.0%            1.7%           0.7%          0.0% 
                      annual rent (c)             $298,191           $0        $122,937        $29,968            $0 
                      psf (d)                       $24.18        $0.00          $35.13         $21.24         $0.00 
                      tenants (e)                        2            0               1              1             0 
</TABLE>

<TABLE>
<CAPTION>
                                                               Lease Expirations--Cambridge Office Market 
                                                 ------------------------------------------------------------------------ 
                                                                                                                2005 and 
Property                                               2001          2002         2003           2004            beyond 
- -----------------     ----------------------      ---------      ---------      ---------      ---------      ----------- 
<S>                   <C>                        <C>           <C>               <C>            <C>            <C>
One Canal             square feet (a)                87,244             0            0              0              0 
                      % sq. ft. (b)                    87.0%          0.0%         0.0%           0.0%           0.0
                      annual rent (c)            $1,842,665            $0           $0             $0             $0
                      psf (d)                        $21.12         $0.00        $0.00          $0.00          $0.00
                      tenants (e)                         2             0            0              0              0
Ten Canal             square feet (a)                     0        84,998            0              0              0
                      % sq. ft. (b)                     0.0%         76.7%         0.0%           0.0%           0.0
                      annual rent (c)                    $0    $1,974,504           $0             $0             $0
                      psf (d)                         $0.00        $23.23        $0.00          $0.00          $0.00
                      tenants (e)                         0             1            0              0              0
                                                  ---------      ---------      ---------      ---------      ------ 
TOTAL                 square feet (a)                87,244        84,998            0              0              0
                      % sq. ft. (b)                    41.3%         40.3%         0.0%           0.0%           0.0
                      annual rent (c)            $1,842,665    $1,974,504           $0             $0             $0
                      psf (d)                        $21.12        $23.23        $0.00          $0.00          $0.00
                      tenants (e)                         2             1            0              0              0 
</TABLE>


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

(a) Total area in square feet covered by such leases 

(b) Percentage of total square feet represented by such leases 


(c) Annualized base rental income represented by such leases in the year of 
    expiration plus 1995 tenant payments on account of real estate tax and 
    operating expense escalations, except leases with CPI increases in lieu 
    of expense recoveries. 



(d) Calculated as annual rent divided by square feet 


(e) The number of tenants whose leases will expire 

                                      S-36
<PAGE>

The Suburban Philadelphia Office Market 

   As of June 1996 there were approximately 35.2 million square feet of 
office space in the Suburban Philadelphia Office Market. According to Grubb & 
Ellis, the entire Suburban Philadelphia Office Market had a vacancy rate of 
12.9% in June 1996. 


   One, Two, Three and Five Westlakes Drive are located in the Suburban 
Philadelphia Office Market. The average Base Rent per square foot and the 
average annual Net Effective Rent per square foot for the four Properties 
were $20.56 and $15.77, respectively, as of June 30, 1996. 


   Westlakes Office Park. Each building in the Westlakes Office Park is a 
three-story office building. These buildings were constructed between 1988 
and 1990. Collectively, these buildings contain an aggregate of approximately 
444,000 square feet. As of June 30, 1996, these buildings were approximately 
94% leased. 

   The following table sets forth lease expirations (in square feet) for each 
of the Company's Properties in the Suburban Philadelphia Office Market. 


<TABLE>
<CAPTION>
                                                         Lease Expirations--Suburban Philadelphia Office Market 
                                                 ------------------------------------------------------------------------ 
Property                                            1996          1997           1998           1999            2000 
- -----------------                                -----------    -----------    -----------   -----------   ------------- 
<S>                   <C>                        <C>            <C>            <C>           <C>             <C>
Westlakes 1           square feet(a)                 37,159       20,616         19,329          14,685          13,839 
                      % sq. ft.(b)                     27.1%        15.0%          14.1%           10.7%           10.1% 
                      annual rent(c)               $814,262     $457,260       $391,845        $226,298        $293,492 
                      psf(d)                         $21.91       $22.18         $20.27          $15.41          $21.21 
                      tenants(e)                          7            4              3               3               3 
Westlakes 2           square feet(a)                  1,812        6,668          3,258          11,827          35,447 
                      % sq. ft.(b)                      1.4%         5.2%           2.5%            9.2%           27.5% 
                      annual rent(c)                $20,043     $139,471        $60,022        $249,071        $778,427 
                      psf(d)                         $11.06       $20.92         $18.42          $21.06          $21.96 
                      tenants(e)                          2            1              2               2               2 
Westlakes 3           square feet(a)                      0        3,680              0               0         109,065 
                      % sq. ft.(b)                      0.0%         3.1%           0.0%            0.0%           92.4% 
                      annual rent(c)                     $0      $90,060             $0              $0      $2,727,600 
                      psf(d)                          $0.00       $24.47          $0.00           $0.00          $25.01 
                      tenants(e)                          0            1              0               0               2 
Westlakes 5           square feet(a)                 16,542            0              0          27,480          12,928 
                      % sq. ft.(b)                     27.6%         0.0%           0.0%           45.8%           21.5% 
                      annual rent(c)               $452,698           $0             $0        $667,864        $303,630 
                      psf(d)                         $27.37        $0.00          $0.00          $24.30          $23.49 
                      tenants(e)                          3            0              0               2               2 
                                                  ---------      ---------      ---------      ---------      ----------- 
TOTAL                 square feet(a)                 55,513       30,964         22,587          53,992         171,279 
                      % sq. ft.(b)                     12.5%         7.0%           5.1%           12.2%           38.6% 
                      annual rent(c)             $1,287,003     $686,791       $451,866      $1,143,233      $4,103,149 
                      psf(d)                         $23.18       $22.18         $20.01          $21.17          $23.96 
                      tenants(e)                         12            6              5               7               9 
</TABLE>

<TABLE>
<CAPTION>
                                                         Lease Expirations--Suburban Philadelphia Office Market 
                                                 ------------------------------------------------------------------------ 
                                                                                                                2005 and 
Property                                            2001            2002            2003         2004            beyond 
- -----------------                                 ---------      ---------      ---------      ---------      ----------- 
<S>                   <C>                        <C>            <C>           <C>              <C>          <C>
Westlakes 1           square feet(a)                   0          14,538               0            0              0 
                      % sq. ft.(b)                   0.0%           10.6%            0.0%         0.0%           0.0% 
                      annual rent(c)                  $0        $312,760              $0           $0             $0
                      psf(d)                       $0.00          $21.51           $0.00        $0.00          $0.00
                      tenants(e)                       0               1               0            0              0
Westlakes 2           square feet(a)                   0               0          44,236            0         22,413
                      % sq. ft.(b)                   0.0%            0.0%           34.3%         0.0%          17.4% 
                      annual rent(c)                  $0              $0        $973,192           $0       $411,319
                      psf(d)                       $0.00           $0.00          $22.00        $0.00         $18.35
                      tenants(e)                       0               0               2            0              2
Westlakes 3           square feet(a)                   0               0               0            0              0
                      % sq. ft.(b)                   0.0%            0.0%            0.0%         0.0%           0.0% 
                      annual rent(c)                  $0              $0              $0           $0             $0
                      psf(d)                       $0.00           $0.00           $0.00        $0.00          $0.00
                      tenants(e)                       0               0               0            0              0
Westlakes 5           square feet(a)                   0               0           2,746            0              0
                      % sq. ft.(b)                   0.0%            0.0%            4.6%         0.0%           0.0% 
                      annual rent(c)                  $0              $0         $60,412           $0             $0
                      psf(d)                       $0.00           $0.00          $22.00        $0.00          $0.00
                      tenants(e)                       0               0              1             0              0
                                                  ---------      ---------      ---------      ---------      -------- 
TOTAL                 square feet(a)                   0          14,538          46,982            0         22,413
                      % sq. ft.(b)                   0.0%            3.3%           10.6%         0.0%           5.0% 
                      annual rent(c)                  $0        $312,760      $1,033,604           $0       $411,319
                      psf(d)                       $0.00          $21.51          $22.00        $0.00         $18.35
                      tenants(e)                       0               1              3             0              2
</TABLE>

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

(a) Total area in square feet covered by such leases 

(b) Percentage of total square feet represented by such leases 

(c) Annualized base rental income represented by such leases in the year of 
    expiration plus 1995 tenant payments on account of real estate tax and 
    operating expense escalations, except leases with CPI increases in lieu 
    of expense recoveries. 

(d) Calculated as annual rent divided by square feet 

(e) The number of tenants whose leases will expire 

                                      S-37
<PAGE>
 
The Arlington County, Virginia Market 

   As of March 1996 there were approximately 27.7 million square feet of 
office space in the Arlington County, Virginia Market. According to Grubb & 
Ellis, the Arlington County, Virginia Market had a vacancy rate of 4.1% as of 
March 1996. The Crystal City submarket, with approximately 11.3 million 
square feet, had a vacancy rate of 0.5% in March 1996. 

   The Polk and Taylor Buildings. The Polk and Taylor Buildings are comprised 
of two twelve-story office buildings in the Crystal City submarket, commonly 
known as the James K. Polk Building (National Center 2) and the Zachary 
Taylor Building (National Center 3), numbered 2521 Jefferson Davis Highway 
and 2531 Jefferson Davis Highway, respectively. The Polk and Taylor Buildings 
together contain approximately 890,000 rentable square feet with an 
underground parking garage for 1,182 vehicles. Both buildings were 
constructed in 1970. 

   The Company holds a 10% general and limited partner interest in the 
partnership that owns the Polk and Taylor Buildings. Crystal Holdings 
Corporation, an affiliate of the President and Fellows of Harvard College, 
owns the remaining 90% general and limited partner interest in such 
partnership. 


   As of December 31, 1995, the Polk and Taylor Buildings were 100% leased, with
substantially all of the space leased to the United States of America, acting by
and through its General Services Administration, for occupancy by the United
States Navy under leases which will expire in the summer of 1997 and provide for
annual Base Rent in 1996 of approximately $18 million. This lease contains an
option to renew for a one year period with an increase in Net Effective Rent of
$2.35 per square foot.



Suburban Chicago Office Market and Washington, D.C. Office Market 



   As of June 1996, there were approximately 59.8 million square feet of 
office space in the Suburban Chicago Office Market, approximately 20.4 
million of which is located in the East-West Corridor submarket and 
approximately 12.5 million of which is located in the North Suburban 
submarket. The AT&T Plaza building is located in East-West Corridor submarket 
and the Tri-State International property is located in the North Suburban 
submarket. According to Grubb & Ellis the Suburban Chicago Office Market had 
an overall vacancy rate of 12.0% as of June 1996, while the East-West 
Corridor submarket and North Suburban submarket had vacancy rates of 10.3% 
(9.2% for Class A office properties) and 12.6% (8.2% for Class A office 
properties), respectively, for the same period. Grubb & Ellis also reports 
that the East-West Corridor and North submarkets experienced Net Absorption 
of 730,000 square feet and 340,000 square feet, respectively, for the first 
six months of 1996. 


   As of March 1996, there were approximately 95.9 million square feet of 
office space in the Washington, D.C. Office Market, approximately 28 million 
of which is located in the East End submarket. 1333 H Street is located in 
the East End submarket. According to Grubb & Ellis, the Washington, D.C. 
Office Market had an overall vacancy rate of 10.2% as of March 1996, while 
the East End submarket experienced a vacancy rate of 10.1% for the same 
period. 


   The following chart sets forth average annual Base Rents per square foot, 
average annual Net Effective Rents per square foot, and the occupancy rate 
expressed as a percentage, as of June 30, 1996, for each property in the New 
York Life Portfolio. 


<TABLE>
<CAPTION>
                              Rentable                        Average 
                                Area          Average       Annual Net 
                             (in square       Annual         Effective     Occupancy 
Property                       feet)         Base Rent         Rent          Rate 
- ------------------------     -----------    ------------    ------------   --------- 
<S>                          <C>              <C>             <C>             <C>
AT&T Plaza                     225,318        $20.78          $14.21          100% 
Tri-State International        548,000         23.84           16.79           68% 
1333 H Street                  238,694         26.90           20.77           92% 
                              ---------      ----------      ----------      ------- 
    Total Weighted Average   1,012,012        $23.82          $17.16           81% 
</TABLE>


                                      S-38
<PAGE>
 

   The following table sets forth lease expirations (in square feet) for each 
of the properties in the New York Life Portfolio. 

<TABLE>
<CAPTION>
                                                               Lease Expirations--New York Life Portfolio 
                                                 ------------------------------------------------------------------------ 
                                                (7/1-12/31) 
Property                                            1996          1997           1998           1999           2000 
- -----------------                                -----------    -----------    -----------   -----------   ------------- 
<S>                   <C>                        <C>           <C>            <C>            <C>           <C>
AT&T Plaza            square feet(a)                 5,144         10,313         39,731          29,539         79,574 
                      % sq. ft.(b)                     2.3%           4.6%          17.6%           13.1%          35.3% 
                      annual rent(c)              $119,789       $200,629       $829,624        $669,598     $1,758,066 
                      psf(d)                        $23.29         $19.45         $20.88          $22.67         $22.09 
                      tenants(e)                         2              4              6               2              4 
Tri-State 
  International       square feet(a)                18,569        120,039         17,436          62,585         18,237 
                      % sq. ft.(b)                     3.4%          21.9%           3.2%           11.4%           3.3% 
                      annual rent(c)              $523,337     $2,884,193       $361,023      $1,640,939       $364,440 
                      psf(d)                        $28.18         $24.03         $20.71          $26.22         $19.98 
                      tenants(e)                         2              9              2               6              3 
                                                  ---------      ---------      ---------      ---------      ----------- 
1333 H Street         square feet(a)                     0          2,223          4,045           2,097          8,835 
                      % sq. ft.(b)                     0.0%           0.9%           1.7%            1.2%           3.7% 
                      annual rent(c)                    $0       $109,788       $110,867         $43,954       $247,390 
                      psf(d)                         $0.00         $49.39         $27.41          $15.12         $28.00 
                      tenants(e)                         0              1              3               1              3 
TOTAL                 square feet(a)                23,713        132,575         61,212          95,031        106,646 
                      % sq. ft.(b)                     2.3%          13.1%           6.0%            9.4%          10.5% 
                      annual rent(c)              $643,126     $3,194,609     $1,301,514      $2,354,491     $2,369,895 
                      psf(d)                        $27.12         $24.10         $21.26          $24.78         $22.22 
                      tenants(e)                         4             14             11               9             10 
</TABLE>


<TABLE>
<CAPTION>
                                                               Lease Expirations--New York Life Portfolio 
                                                 ------------------------------------------------------------------------ 
<S>                   <C>                        <C>            <C>           <C>             <C>           <C>
                                                                                                                2005 and 
Property                                              2001           2002          2003          2004           beyond 
- -----------------                                 ---------      ---------      ---------      ---------      ----------- 
AT&T Plaza            square feet(a)                      0         12,288        38,249         8,165           2,315
                      % sq. ft.(b)                      0.0%           5.5%         17.0%          3.6%            1.0% 
                      annual rent(c)                     $0       $282,240      $992,014      $197,014              $0 
                      psf(d)                          $0.00         $22.97        $25.94        $24.13           $0.00 
                      tenants(e)                          0              2             3             1               1 
Tri-State 
  International       square feet(a)                107,254              0             0        27,491               0 
                      % sq. ft.(b)                     19.6%           0.0%          0.0%          5.0%            0.0% 
                      annual rent(c)             $2,831,535             $0            $0      $721,639              $0 
                      psf(d)                         $26.40          $0.00         $0.00        $26.25           $0.00 
                      tenants(e)                         10              0             0             1               0 
                                                  ---------      ---------      ---------      ---------      ----------- 
1333 H Street         square feet(a)                  2,945         57,041        14,708             0         127,248 
                      % sq. ft.(b)                      1.2%          23.9%          6.2%          0.0%           53.3% 
                      annual rent(c)                $77,836     $1,758,913      $461,684            $0      $4,370,422 
                      psf(d)                         $26.43         $30.84        $31.39         $0.00          $34.35 
                      tenants(e)                          1              1             1             0               2 
TOTAL                 square feet(a)                110,199         69,329        52,957        35,656         129,563 
                      % sq. ft.(b)                     10.9%           6.9%          5.2%          3.5%           12.8% 
                      annual rent(c)             $2,909,371     $2,041,152    $1,453,698      $918,652      $4,370,422 
                      psf(d)                         $26.40         $29.44        $27.45        $25.76          $33.73 
                      tenants(e)                         11              3             4             2               3 
</TABLE>

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

(a) Total area in square feet covered by such leases 

(b) Percentage of total square feet represented by such leases 

(c) Annualized expiring base rental income represented by such leases in the 
    year of expiration plus 1995 tenant payments on account of real estate 
    tax and operating expense escalations, except leases with CPI increases 
    in lieu of expense recoveries. 

(d) Calculated as annual rent divided by square feet 

(e) The number of tenants whose leases will expire 


                                      S-39
<PAGE>

The Fairfax County, Virginia Market 

   As of March 1996, there were approximately 62.4 million square feet of 
office space in the Fairfax County, Virginia Market, 20.7 million square feet 
of which are located in the Tysons Corner submarket and 13 million square 
feet of which are located in the Reston/Herndon submarket. According to Grubb 
& Ellis, the Fairfax County, Virginia Market had an overall vacancy rate of 
8.0% as of March 1996 and the submarkets of Tysons Corner and Reston/ Herndon 
had vacancy rates of 8.2% and 5.3%, respectively, for the same period. Grubb 
& Ellis also reports that Tysons Corner and Reston/Herndon submarkets 
experienced Net Absorption of 600,000 square feet and 400,000 square feet, 
respectively, for the three months ended March 31, 1996. The Fairfax County 
Portfolio is located in the Fairfax County, Virginia Market. 

   The following chart sets forth average annual Base Rents per square foot, 
average annual Net Effective Rents per square foot, and the occupancy rate, 
expressed as a percentage, as of June 30, 1996, for each property in the 
Fairfax County Portfolio. 

<TABLE>
<CAPTION>
                              Rentable                         Average 
                                Area           Average       Annual Net 
                             (in square        Annual         Effective     Occupancy 
Property                        feet)         Base Rent         Rent          Rate 
- ------------------------     ------------    ------------    ------------   --------- 
<S>                           <C>              <C>             <C>             <C>
John Marshall I               261,364          $17.30          $15.73          100% 
E.J. Randolph                 164,677           20.74           15.82           80% 
Northridge I                  124,319           25.49           19.34          100% 
                              ----------      ----------      ----------      ------- 
    Total Weighted Average    550,360          $19.60          $16.57           94% 
</TABLE>

   The following table sets forth lease expirations (in square feet) for each 
of the properties in the Fairfax County Portfolio. 

<TABLE>
<CAPTION>
                                                               Lease Expirations--Fairfax County Portfolio 
                                                 ------------------------------------------------------------------------ 
                                                (7/1-12/31) 
Property                                            1996          1997           1998           1999           2000 
- -----------------                                -----------    -----------    -----------   -----------   ------------- 
<S>                   <C>                        <C>            <C>             <C>           <C>           <C>
John Marshall I       square feet(a)                    0             0             0               0                0 
                      % sq. ft.(b)                    0.0%          0.0%          0.0%            0.0%             0.0% 
                      annual rent(c)                   $0            $0            $0              $0               $0 
                      psf(d)                        $0.00         $0.00         $0.00           $0.00            $0.00 
                      tenants(e)                        0             0             0               0                0 
E.J. Randolph         square feet(a)               10,976           808             0           1,801            8,091 
                      % sq. ft.(b)                    6.7%          0.5%          0.0%            1.1%             4.9% 
                      annual rent(c)             $275,171       $16,537            $0         $65,606         $217,035 
                      psf(d)                       $25.07        $20.47         $0.00           36.43           $26.82 
                      tenants(e)                        2             1             0               3                2 
Northridge I          square feet(a)                    0             0             0               0          124,319 
                      % sq. ft.(b)                    0.0%          0.0%          0.0%            0.0%           100.0% 
                      annual rent(c)                   $0            $0            $0              $0       $3,346,079 
                      psf(d)                        $0.00         $0.00         $0.00           $0.00           $26.92 
                      tenants(e)                        0             0             0               0                1 
                                                  ---------      ---------      ---------      ---------      ----------- 
TOTAL                 square feet(a)               10,976           808             0           1,801          132,410 
                      % sq. ft.(b)                    2.0%          0.1%          0.0%            0.3%            24.1% 
                      annual rent(c)             $275,171       $16,537            $0         $65,606       $3,563,113 
                      psf(d)                       $25.07        $20.47         $0.00          $36.43           $26.91 
                      tenants(e)                        2             1             0               3                3 
</TABLE>

<TABLE>
<CAPTION>
                                                                                                              2005 and 
Property                                           2001           2002           2003           2004           beyond 
- -----------------                                -----------    -----------    -----------   -----------   ------------- 
<S>                   <C>                        <C>            <C>             <C>          <C>            <C>
John Marshall I       square feet(a)                2,788              0            0                 0        258,576 
                      % sq. ft.(b)                    1.1%           0.0%         0.0%              0.0%          98.9% 
                      annual rent(c)              $92,639             $0           $0                $0     $6,653,160 
                      psf(d)                       $33.23          $0.00        $0.00             $0.00         $25.73 
                      tenants(e)                        1              0            0                 0              1 
E.J. Randolph         square feet(a)               20,714          8,014            0            82,149              0 
                      % sq. ft.(b)                   12.6%           4.9%         0.0%             49.9%           0.0% 
                      annual rent(c)             $544,555       $179,113           $0        $1,965,238             $0 
                      psf(d)                       $26.29         $22.35        $0.00            $23.92          $0.00 
                      tenants(e)                        2              1            0                 4              0 
Northridge I          square feet(a)                    0              0            0                 0              0 
                      % sq. ft.(b)                    0.0%           0.0%         0.0%              0.0%           0.0% 
                      annual rent(c)                   $0             $0           $0                $0             $0 
                      psf(d)                        $0.00          $0.00        $0.00             $0.00          $0.00 
                      tenants(e)                        0              0            0                 0              0 
                                                  ---------      ---------      ---------      ---------      ----------- 
TOTAL                 square feet(a)               23,502          8,014            0            82,149        258,576 
                      % sq. ft.(b)                    4.3%           1.5%         0.0%             14.9%          47.0% 
                      annual rent(c)             $637,194       $179,113           $0        $1,965,238     $6,653,160 
                      psf(d)                       $27.11         $22.35        $0.00            $23.92         $25.73 
                      tenants(e)                        3              1            0                 4              1 
</TABLE>

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

(a) Total area in square feet covered by such leases 

(b) Percentage of total square feet represented by such leases 

(c) Annualized expiring base rental income represented by such leases in the 
    year of expiration plus 1995 tenant payments on account of real estate 
    tax and operating expense escalations, except leases with CPI increases 
    in lieu of expense recoveries. 

(d) Calculated as annual rent divided by square feet 

(e) The number of tenants whose leases will expire 



                                      S-40
<PAGE>
 
Historical Non-Incremental Revenue-Generating Capital Expenditures and Tenant 
Improvement Costs 

   The following tables set forth annual and per square foot recurring, 
non-incremental revenue-generating capital expenditures and non-incremental 
revenue-generating tenant improvement costs to retain revenues attributable 
to existing leased space (including leasing commissions and rent concessions) 
for the period 1991 through 1995. The tables provide total capital 
expenditures and non-incremental revenue-generating tenant improvement costs 
for the Properties, without regard to the Company's proportionate ownership 
interest in each Property, and the Company's proportionate share of total 
capital expenditures and tenant improvement costs based on its ownership 
interest in the Properties with respect to which such expenditures and costs 
were incurred. All capital expenditures presented for the Properties are 
non-incremental revenue-generating. As noted, revenue-generating tenant 
improvement costs are excluded from the table set forth immediately below. 
Such costs generally relate to vacant space, unless a prior tenant was paying 
rent while such space was being improved for a future tenant, in which case 
the costs to improve such space were considered non- incremental 
revenue-generating and, therefore, included in the table. The historical 
capital expenditures and tenant improvement costs set forth below are not 
necessarily indicative of future recurring, non-incremental 
revenue-generating capital expenditures or non-incremental revenue-generating 
tenant improvement costs. 

              Properties (excluding Perimeter Center Portfolio) 

<TABLE>
<CAPTION>
                                                                                           1991-1995 
                                   1991(a)  1992(a)  1993(a)     1994(a)      1995(a)     Average(a) 
                                   -------  -------  -------     -------      -------     ---------- 
                                           (dollars in thousands, except per square foot data) 
<S>                                 <C>      <C>      <C>       <C>         <C>             <C>    
Capital Expenditures 
Properties Total 
  Annual                            $  917   $  702   $  226    $  1,001(b) $  3,309(b)(c)  $ 1,231 
  Per square foot                   $ 0.31   $ 0.23   $ 0.08    $   0.24    $   0.50        $  0.27 
 Company's Proportionate Share 
  Annual                            $  730   $  551   $  193    $    609(b) $  2,174(b)(c)  $   851 
  Per square foot                   $ 0.35   $ 0.26   $ 0.09    $   0.15    $   0.44        $  0.26 
Non-incremental 
  Revenue-Generating 
 Tenant Improvement Costs 
 Properties Total 
  Annual                            $4,229   $2,650   $2,077    $  4,289(c) $  7,369        $ 4,123 
  Per square foot improved          $13.09   $ 7.38   $10.43    $  10.24    $  10.13        $ 10.25 
  Per square foot total             $ 1.41   $ 0.88   $ 0.69    $   1.02    $   1.10        $  1.02 
 Company's Proportionate Share 
  Annual                            $2,737   $2,167   $1,806    $  3,280(c) $  7,040        $ 3,406 
  Per square foot improved          $13.14   $ 8.86   $11.78    $   9.71    $  10.60        $ 10.82 
  Per square foot total             $ 1.30   $ 1.03   $ 0.86    $   1.15    $   1.43        $  1.15 
</TABLE>

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


(a) Information regarding the Properties acquired in the Initial Offering is 
    presented for all periods. Information regarding Properties acquired 
    subsequent to the Initial Offering is presented from the date of 
    acquisition. 

(b) Excludes cost incurred in connection with the redevelopment of the Center 
    Plaza Property of $1.4 million and $0.86 million, or $1.1 million and 
    $0.86 million for the Company's proportionate share of such expenditures 
    for the years 1994 and 1995, respectively. A portion of these capital 
    expenditures are incremental revenue-generating expenditures. 

(c) Includes $1.8 million and $0.2 million tenant improvement costs for the 
    years 1994 and 1995, respectively, for renewal of an existing 20-year 
    tenant, for an additional 15 years, representing approximately 25% of the 
    175 Federal Street Property. This amount was funded from escrow reserves 
    established by Beacon prior to the Initial Offering. The Company's 
    proportionate share is $1.1 million and $0.2 million. Also includes $0.9 
    million and $1.0 million of tenant improvement costs for the years 1994 
    and 1995, respectively, for renewal of an existing 10-year tenant, for an 
    additional 11 years, occupying 100% of the 80 William Street Property. 
    This amount was funded from reserves set up at the closing of the Initial 
    Offering. 



                          Perimeter Center Portfolio 

<TABLE>
<CAPTION>
                                                                                  1991-1995 
                                      1991     1992     1993     1994     1995     Average 
                                      -----    -----    -----    -----    -----   --------- 
                                      (dollars in thousands, except per square foot data) 
<S>                                 <C>      <C>      <C>      <C>      <C>        <C>
Capital Expenditures 
 Annual                             $  928   $1,729   $1,499   $1,419   $  969     $1,309 
 Per square foot                    $ 0.28   $ 0.52   $ 0.45   $ 0.43   $ 0.29     $ 0.39 
Non-incremental 
  Revenue-Generating 
Tenant Improvement Costs(a) 
 Annual                             $4,431   $1,093   $1,854   $1,943   $2,736     $2,411 
 Per square foot improved           $ 9.72   $ 8.58   $ 7.05   $ 6.27   $ 5.86     $ 7.50 
 Per square foot total              $ 1.34   $ 0.33   $ 0.56   $ 0.59   $ 0.83     $ 0.73 
</TABLE>


- -------------
(a) Costs are presented in the year in which the related lease was signed. 


                                      S-41
<PAGE>
 
Historical Incremental Revenue-Generating Tenant Improvement Costs 

   The following tables set forth annual and per square foot incremental 
revenue-generating tenant improvement costs (including lease commissions and 
rent concessions) for the period 1991 through 1995. The Company does not have 
any historical incremental revenue-generating capital expenditures. The 
foregoing tables provide all remaining tenant improvement costs not included 
in the tables set forth above for the Properties (excluding Crosby Corporate 
Center redevelopment costs), without regard to the Company's proportionate 
ownership interest in each Property, and provide the Company's proportionate 
share of such tenant improvement costs based on its ownership interest in the 
Properties with respect to which such costs were incurred. Incremental 
revenue-generating tenant improvement costs generally relate to vacant 
non-revenue generating space. The historical incremental revenue- generating 
tenant improvement costs set forth below are not necessarily indicative of 
future incremental revenue- generating tenant improvement costs. 

              Properties (excluding Perimeter Center Portfolio) 



<TABLE>
<CAPTION>
                                                                                     1991-1995 
                                1991(a)     1992(a)     1993(a)  1994(a)  1995(a)   Average(a) 
                                -------     -------     -------  -------  -------   ---------- 
                                      (dollars in thousands, except per square foot data) 
<S>                              <C>        <C>         <C>       <C>      <C>        <C>     
Incremental Revenue-Generating 
 Tenant Improvement Costs 
  Properties Total 
   Annual                        $1,693     $3,055(b)   $7,438(c) $6,141   $8,027     $5,271 
   Per square foot improved      $13.90     $22.55      $29.90    $26.92   $29.56     $24.57 
   Per square foot total         $ 0.56     $ 1.02      $ 2.47    $ 1.47   $ 1.20     $ 1.34 
  Company's Proportionate 
  Share 
   Annual                        $1,176     $2,134      $5,221    $4,051   $7,283     $3,973 
   Per square foot improved      $14.70     $24.55      $31.26    $25.77   $30.24     $25.30 
   Per square foot total         $ 0.56     $ 1.01      $ 2.47    $ 1.43   $ 1.48     $ 1.39 
</TABLE>

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

(a) Information regarding the Properties acquired in the Initial Offering is 
    presented for all periods. Information regarding Properties acquired 
    subsequent to the Initial Offering is presented from the date of 
    acquisition. 

(b) This amount includes approximately $1.75 million of tenant improvement 
    costs relating to a six-year leasehold of approximately 5% of the total 
    rentable square footage of the Center Plaza Property. 

(c) This amount includes approximately $4.34 million of tenant improvement 
    costs relating to a 10-year leasehold and an 11-year leasehold 
    aggregating 19% of the total rentable square footage of the Center Plaza 
    Property. 


                          Perimeter Center Portfolio 

<TABLE>
<CAPTION>
                                                                              1991-1995 
                                  1991     1992     1993     1994     1995     Average 
                                  -----    -----    -----    -----    -----   --------- 
                                  (dollars in thousands, except per square foot data) 
<S>                             <C>      <C>      <C>      <C>      <C>        <C>     
Incremental 
  Revenue-Generating 
 Tenant Improvement Costs(a) 
  Annual                        $4,126   $1,256   $2,247   $2,085   $2,600     $2,463 
  Per square foot improved      $18.31   $17.02   $15.12   $16.54   $16.09     $16.62 
  Per square foot total         $ 1.25   $ 0.38   $ 0.68   $ 0.63   $ 0.79     $ 0.75 
</TABLE>

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


(a) Costs are presented in the year in which the related lease was signed. 



                                      S-42
<PAGE>
 
Mortgage Indebtedness and Credit Facility 


   The Company's total outstanding consolidated mortgage debt and its 
proportionate share of the total outstanding unconsolidated mortgage debt on 
the Properties (excluding Rowes Wharf) will be approximately $496.4 million 
at August 1, 1996. Additionally, at August 1, 1996, the Company will have no 
outstanding balance under the Credit Facility. The following table sets forth 
certain information regarding the consolidated and unconsolidated mortgage 
debt obligations of the Company, including mortgage obligations relating to 
specific Properties, and the Credit Facility. All of the mortgage debt is 
nonrecourse to the Company. The following table also sets forth certain 
information regarding the mortgage debt to be assumed by the Company in 
connection with the Pending Acquisitions. 


<TABLE>
<CAPTION>
                                       Principal   Company's 
                                          Amount     Portion 
                                          (as of       of     Interest     Maturity            Prepayment 
               Property                  8/1/96)   Principal     Rate        Date              Provisions 
- -------------------------------------     -------    --------    ------    ----------   ------------------------ 
                                                              (dollar amounts in millions) 
<S>                                       <C>        <C>         <C>       <C>          <C>
Mortgage Indebtedness: 
Consolidated Properties 
150 Federal Street                        $ 57.0     $ 57.0      6.67%     11/1/98(a)    Prepayable subject to 
                                                                                         conditions(b) 
175 Federal Street                          13.1       13.1      8.00%      7/1/98(c)    Prepayable subject to 
                                                                                         conditions(d) 
Wellesley Office Park                       55.0       55.0      7.23%      2/1/03(e)    Prepayable subject to 
                                                                                         conditions(f) 
Center Plaza                                60.0       60.0      7.23%      3/1/03(g)    Prepayable subject to 
                                                                                         conditions(h) 
Perimeter Center Portfolio                 218.0      218.0      7.08%      4/1/06(i)    Prepayable subject to 
                                           -----      ------                             conditions(j) 
 Total Consolidated Properties            $403.1     $403.1 
                                           -----      ------ 
Unconsolidated Properties with 
  respect to which the Company is a 
  general partner or shareholder 
One Post Office Square(k)                 $ 68.2     $ 34.1      7.00%      8/1/00(l)    Prepayable subject to 
                                                                                         conditions(m) 
One Post Office Square(k)                   25.5       12.8      8.25%      8/1/00(n)    Prepayable subject to 
                                                                                         conditions(o) 
75-101 Federal Street(p)                    90.0       46.4      7.61%     10/1/02(q)    Prepayable subject to 
                                           -----      ------                             conditions(r) 
 Total Unconsolidated Properties           183.7       93.3 
                                           -----      ------ 
 Total Mortgage Debt                      $586.8     $496.4 
                                           =====      ====== 
Credit Facility: 
 Various Properties(s)                    $  0(t)    $  0(t)       (u)     6/27/99       Prepayable at any 
                                           =====      ======                             time without penalty 
Pending Acquisitions: 
John Marshall I                           $21.1      $21.1       8.38%     12/1/08       Prepayable subject to 
                                                                                         conditions(v) 
E.J. Randolph                               18.0(t)    18.0(t)     (u)     6/27/99       Prepayable subject to 
                                                                                         conditions(w) 
Northridge I                               16.3       16.3       7.28%    12/14/96(x)    Prepayable subject to 
                                           -----      ------                             conditions(y) 
                                          $ 55.4     $55.4 
</TABLE>

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

(a) The estimated balance due on maturity is approximately $56.1 million. 

(b) Prepayable subject to a yield maintenance payment based on the rate of 
    United States Treasury Notes having a term closest to the date of 
    maturity but in no event less than 1% of the then balance. Prepayable at 
    par from and after April 1, 1998. 

(c) The estimated balance due on maturity is approximately $12.5 million. 



                                      S-43
<PAGE>
 

(d) Prepayable subject to a yield maintenance payment based on the rate of 
    United States Treasury Notes having a term closest to the date of 
    maturity plus 1.50%, but in no event less than 1% of the then balance. 
    Prepayable at par from and after March 1, 1998. 

(e) The estimated balance due on maturity is approximately $51.9 million. 

(f) Prepayable after August 1, 1999 subject to a yield maintenance payment 
    based on the rate of United States Treasury Notes having a term closest 
    to the date of maturity plus 0.50%. Prepayable at par from and after 
    October 1, 2002. 

(g) The estimated balance due on maturity is approximately $56.7 million. 

(h) Prepayable after September 1, 1999 subject to a yield maintenance payment 
    based on the rate of United States Treasury Notes having a term closest 
    to the date of maturity plus 0.50%. Prepayable at par from and after 
    November 1, 2002. 

(i) The estimated balance due on maturity is approximately $183.8 million. 

(j) Closed to prepayment during the first two years of the loan, prepayable 
    in years three through ten subject to a yield maintenance payment based 
    on the rate of United States Treasury Notes having a term closest to the 
    date of maturity plus 0.50%, and prepayable at par during the last 90 
    days of the loan. 

(k) The Company owns a 50% general partner interest in the partnership that 
    owns One Post Office Square. Consequently, the Company's portion of the 
    debt on the One Post Office Square Property is 50% of the principal 
    amount. 

(l) The Company's share of the estimated balance due on maturity is 
    approximately $31.9 million. 

(m) Prepayable after August 31, 1997 subject to a yield maintenance payment 
    based on the rate of United States Treasury Notes having a term closest 
    to the date of maturity plus 0.50%. Prepayable at par from and after 
    February 1, 2000. 

(n) The Company's share of the estimated balance due on maturity is 
    approximately $11.2 million. 

(o) Prepayable subject to a yield maintenance payment based on the rate of 
    United States Treasury Notes having a term closest to the date of 
    maturity plus 1.50%. Prepayable at par from and after May 1, 2000. 

(p) The Company owns an approximate 51.6% equity interest in the private REIT 
    that owns 75-101 Federal Street. Consequently, the Company's portion of 
    the debt on the 75-101 Federal Street property is approximately 51.6% of 
    the principal amount. 

(q) The Company's share of the estimated balance due on maturity is 
    approximately $44.0 million. 

(r) Prepayable after January 1, 1999 subject to a yield maintenance payment 
    based on the rate of United States Treasury Notes having a term closest 
    to the date of maturity plus 0.50%. Prepayable at par from and after June 
    1, 2002. 

(s) The Credit Facility is secured by cross-collateralized mortgages and 
    assignments of rents on the Crosby Corporate Center, 150 Federal Street, 
    One Canal Park, Westwood Business Centre, Westlakes Office Park, 2 Oliver 
    Street, Ten Canal Park and Russia Wharf. 

(t) Following the consummation of the Pending Acquisitions, it is currently 
    anticipated that the Company will have $18 million outstanding under its 
    Credit Facility (drawn in connection with the payment of assumed mortgage 
    debt on the E.J. Randolph building) and may also have, to the extent 
    necessary for the consummation of the acquisition of the New York Life 
    Portfolio, additional amounts outstanding. 

(u) Outstanding balances under the Credit Facility bear interest, at the 
    Company's option, at either (i) the higher of (x) Bank of Boston's base 
    interest rate and (y) 1/2% above the overnight federal funds effective 
    rate or (ii) the Eurodollar rate plus 175 basis points. 

(v) Mandatory annual prepayments and additional prepayments subject to 
    prepayment payments of 5% of the amount prepaid before November 1, 1999, 
    decreasing by 0.5% each subsequent year through September 1, 2008, after 
    which no premium is due upon prepayment. 


                                      S-44
<PAGE>
 

(w) Prepayable subject to a prepayment payment of 3.5% of the amount prepaid 
    through July 9, 1997, decreasing by 0.5% each subsequent year. 

(x) The estimated balance due on maturity is approximately $16.1 million. 

(y) Prepayable subject to a payment equal to the greater of 1% of the 
    outstanding principal balance or a yield maintenance amount based on U.S. 
    Treasury notes having a term closest to the date of maturity. 

   The Company owns a 45% indirect limited partner interest in Rowes Wharf 
Associates, the partnership that owns the hotel space and leases the office 
and retail space at Rowes Wharf. The Company (together with an affiliate) and 
Equitable each own one-half of the mortgage debt on the Rowes Wharf Property. 
The Company has no obligation to fund principal or interest payments with 
respect to the unconsolidated debt of Rowes Wharf Associates or to fund 
operating or other deficits with respect to Rowes Wharf Associates. As of 
August 1, 1996, the aggregate outstanding principal amount of Rowes Wharf 
Associates' debt, which consists of two tiers of debt, equals approximately 
$201.2 million. Rowes Wharf Associates' first-tier debt is equal to 
approximately $126.0 million, currently bears interest at a rate of 8.71% per 
annum and matures in April 1999. 

   Pursuant to its terms, the first-tier debt may be prepaid at any time and 
principal repayment may be extended for up to three years, provided that a 
1.1 interest coverage is achieved at that time. Rowes Wharf Associates 
currently maintains a significant cash account to fund any shortfalls on this 
debt. Rowes Wharf Associates' second-tier debt is equal to approximately 
$75.2 million, currently bears interest at the lesser of 6.0% or 50.0% of 
cash flow after interest payments have been made in respect of Rowes Wharf 
Associates' first-tier debt and matures in April 2002. The second- tier debt 
may be prepaid in full with 50% of the net proceeds from certain sales or 
refinancings of Rowes Wharf Associates' debt, regardless of the amount of 
such proceeds, or at maturity based on the appraised value of the Property. 



                                      S-45
<PAGE>
 
                                USE OF PROCEEDS


   The net cash proceeds to the Company from the sale of the Common Stock 
offered hereby, after deduction of estimated expenses of the Offering, are 
estimated to be approximately $121.6 million (approximately $139.9 million if 
the Underwriters' over-allotment option is exercised in full). 



   The Company intends to apply the net proceeds of the Offering to purchase 
the New York Life Portfolio, and/or for general corporate and working capital 
purposes. Pending application of the net proceeds, the Company will invest 
such portion of the net proceeds in interest-bearing accounts and short-term, 
interest-bearing securities. 



                                      S-46
<PAGE>
 
              PRICE RANGE OF COMMON STOCK AND DISTRIBUTION HISTORY


   The Company's Common Stock began trading on the NYSE on May 20, 1994, 
under the symbol "BCN." On July 19, 1996, the reported closing sale price per 
share of Common Stock on the NYSE was $25-7/8 and there were approximately 
316 holders of record of the Company's Common Stock. The following table sets 
forth the quarterly high and low closing sales prices per share of the Common 
Stock reported on the NYSE and the distributions paid by the Company with 
respect to each such period. 


              Quarter Ended                  High      Low        Distributions 
              -------------                  ----      ---        ------------- 
September 30, 1994                           $19-1/2   $17-3/4      $  .40 
December 31, 1994                            $19       $17          $  .40 
March 31, 1995                               $20       $17-1/2      $  .40 
June 30, 1995                                $21-1/8   $19-1/4      $  .42 
September 30, 1995                           $21-3/4   $19-7/8      $  .42 
December 31, 1995                            $23       $20-1/8      $  .42 
March 31, 1996                               $26-5/8   $22-5/8      $  .42 
June 30, 1996                                $26-1/4   $24-1/2      $.4625(a) 
September 30, 1996 (through July 19, 1996)   $26-1/4   $25-1/4
                                          
- ------------- 

(a) To be paid August 23, 1996 to stockholders of record as of August 14, 
    1996. 

   In July 1996, the Company announced an increase in its quarterly 
distribution of 10.1%, increasing the quarterly distribution on its Common 
Stock from $.42 per share to $.4625 per share, which on an annualized basis, 
is equal to an annual distribution of $1.85 per share of Common Stock. The 
higher distribution rate commenced with the Company's distribution with 
respect to the second quarter of 1996, to be paid on August 23, 1996, to 
stockholders of record as of August 14, 1996. Accordingly, it is currently 
expected that purchasers of Common Stock in the Offering who hold Common 
Stock as of the record date will receive the second quarter 1996 distribution 
in respect of the shares of Common Stock offered hereby. As a result, if 
purchasers of Common Stock in the Offering continue to hold such shares on 
the record date for distributions over the next twelve months, such 
purchasers will receive four quarterly distribution payments in addition to 
the second quarter 1996 distribution. 


   Future distributions by the Company will be at the discretion of the Board 
of Directors and will depend on the Company's financial condition, its 
capital requirements, the annual distribution requirements under the REIT 
provisions of the United States Code and such other factors as the Board of 
Directors deems relevant. There can be no assurance that any such 
distributions will be made by the Company. 

   Distributions by the Company to the extent of its current and accumulated 
earnings and profits for Federal income tax purposes generally will be 
taxable to stockholders as ordinary dividend income. Distributions in excess 
of current and accumulated earnings and profits will be treated as a 
non-taxable reduction of the stockholder's basis in its shares of Common 
Stock to the extent thereof, and thereafter as taxable gain. Distributions 
that are treated as a reduction of the stockholder's basis in its shares of 
Common Stock will have the effect of deferring taxation until the sale of the 
stockholder's shares. 

   The Company has adopted a dividend reinvestment program under which 
holders of Common Stock may elect automatically to reinvest dividends in 
additional Common Stock. The Company may, from time to time, repurchase 
Common Stock in the open market for purposes of fulfilling its obligations 
under this dividend reinvestment program or may elect to issue additional 
Common Stock. 

Historical Total Return 


   An investor who purchased Common Stock in the Company's Initial Offering 
on May 24, 1994, who reinvested all dividends paid in additional shares of 
Common Stock, and who held such shares through the close of business on July 
19, 1996 would have had a cumulative pretax total return of 76.4% or an 
annual compounded pretax return of 30.0% based upon the closing price of the 
Common Stock on July 19, 1996. Past performance, however, is not necessarily 
indicative of the results that will be obtained in the future from an 
investment in the Common Stock, and no assurance can be given that an 
investor in this Offering will achieve similar results. 



                                      S-47
<PAGE>
 

                                CAPITALIZATION 

   The following table sets forth the capitalization of the Company on an 
historical basis as of June 30, 1996, and for the Company as adjusted to give 
effect to the issuance of the shares of Common Stock in the Offering and the 
application of the net proceeds from the Offering as if the Offering and the 
acquisitions of the Fairfax County Portfolio and the New York Life Portfolio 
had occurred on June 30, 1996. See "Use of Proceeds." The information set 
forth in the table should be read in conjunction with the summary and 
selected financial information presented elsewhere in this Prospectus 
Supplement and the Consolidated Financial Statements and notes thereto 
incorporated by reference into the accompanying Prospectus. 


                                            Historical    As Adjusted(1) 
                                            ----------    -------------- 
                                                  (in thousands) 
DEBT: 
 Credit Facility                            $      0      $   18,016 
 Mortgage Notes Payable                      403,218         440,592 
                                              -------      ----------- 
    Total Debt                               403,218         458,608 
                                              -------      ----------- 
MINORITY INTEREST:                            49,051          70,661 
                                              -------      ----------- 
STOCKHOLDERS EQUITY: 
 Common Stock, $.01 par value; 175,000,000 
   shares authorized; 27,368,263 
   (historical) shares issued and 
   outstanding (32,368,263 shares on 
   an as adjusted basis) (1)                     274             324 
 Additional paid-in capital                  443,165         564,728 
 Cumulative net income                        36,259          36,259 
 Cumulative dividends                        (52,768)        (52,768) 
                                              -------      ----------- 
    Total stockholder's equity               426,930         548,543 
                                              -------      ----------- 
    Total capitalization                    $879,199      $1,077,812 
                                              =======      =========== 

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

(1) Does not include Common Stock reserved for issuance upon (i) possible 
    redemption of 5,107,831 Units (including 839,223 Units to be issued in 
    connection with the acquisition of the Fairfax County Portfolio) and (ii) 
    exercise of 1,072,110 options granted pursuant to the 1994 Stock Option 
    Plan. A total of 3,129,310 shares of Common Stock are reserved for 
    issuance under the 1994 Stock Option Plan and dividend reinvestment plan. 



                                      S-48
<PAGE>
 

                        SELECTED FINANCIAL INFORMATION 

   The following table sets forth selected financial and operating 
information on an as adjusted basis for the Company and on a combined 
historical basis for the Company and the Predecessor. The consolidated 
results of operations of the Company for the six months ended June 30, 1996 
and 1995 have been derived from unaudited financial statements. The 
consolidated results of operations of the Company for the year ended December 
31, 1995 and for the period May 26, 1994 to December 31, 1994, the combined 
results of operations of the Predecessor for the period January 1, 1994 to 
May 25, 1994 and the combined historical operating information of the 
Predecessor for the years ended December 31, 1993, 1992 and 1991 have been 
derived from the financial statements audited by Coopers & Lybrand L.L.P., 
independent accountants, whose report with respect to the years 1995, 1994 
and 1993 is incorporated by reference into the accompanying Prospectus. 

   The unaudited selected pro forma financial and operating information is 
presented as if the Offering, the acquisition of the Properties acquired 
since January 1, 1995, the acquisition of the Pending Acquisitions and 
related assumption of debt had occurred as of January 1, 1995, for the 
condensed consolidated statement of operations. The pro forma financial 
information is not necessarily indicative of what the results of operations 
of the Company would have been as of and for the periods indicated, nor does 
it purport to represent the Company's future financial position and results 
of operations. 



                                      S-49
<PAGE>


<TABLE>
<CAPTION>


                                                                           Company 
                                      --------------------------------------------------------------------------------------------
                                        Pro Forma
                                        Six Months       Six Months     Six Months                  For the Year    For the Period
                                           Ended           Ended           Ended          Pro           Ended       May 26, 1994 to
                                       June 30, 1996   June 30, 1996   June 30, 1995   Forma 1995    December 31,     December 31,
                                        (unaudited)     (unaudited)     (unaudited)    (unaudited)       1995            1994 
                                       -------------   -------------   -------------   ----------    ------------     ------------
                                                             (dollars in thousands, except per share amounts) 
<S>                                   <C>             <C>              <C>           <C>            <C>              <C>         
OPERATING INFORMATION: 
Revenue: 
 Rental income                        $    81,335     $    60,051      $    34,093   $   159,129    $    71,050      $    25,144 
 Management fees                            1,517           1,517              936         2,926          2,203               -- 
 Recoveries from tenants                   10,088           6,782            4,813        19,487          9,742            4,488 
 Mortgage interest income                   2,776           2,165              611         5,573          2,546               -- 
 Interest and other income                  5,472           4,591            2,472         7,501          5,502            2,301 
                                          --------        --------        --------        -----        ------          --------- 
   Total revenue                          101,188          75,106           42,925       194,616         91,043           31,933 
                                          --------        --------        --------        -----        ------          --------- 
Expenses:
Property expenses                          20,138          14,770            8,531        39,511         18,090            7,034 
Real estate taxes                           9,768           7,831            4,901        17,953         10,217            3,325 
General and administrative                  8,574           7,362            4,570        13,986          9,755            3,122 
Mortgage interest expense                  16,805          13,661            7,977        33,315         15,226            4,992 
Interest--amortization of financing
  costs                                     1,199           1,184              576         1,490          1,370              617 
Depreciation and amortization              17,947          13,346            8,252        34,856         17,428            6,924 
                                          --------        --------        --------        -----        ------          --------- 
   Total expenses                          74,431          58,154           34,807       141,110         72,086           26,014 
                                          --------        --------        --------        -----        ------          --------- 
Income (loss) from operations              26,757          16,952            8,118        53,506         18,957            5,919 
                                          --------        --------        --------        -----        ------          --------- 
Construction revenue and other
  income                                       --              --               --             --         --                 -- 
Construction costs and operating
  expenses                                     --              --               --             --         --                 -- 
                                          --------        --------        --------        -----        ------          --------- 
Income from construction                       --              --               --             --         --                 -- 
                                          --------        --------        --------        -----        ------          --------- 
Equity (loss) in joint ventures and
  corporations (1)                          1,582           1,582            1,065         4,560          3,222            1,406 
Minority interest in loss of
  combined partnerships                        --              --               --             --         --                 -- 
                                          --------        --------        --------        -----        ------          --------- 
Income (loss) before extraordinary
  items                                    28,339          18,534            9,183        58,066         22,179            7,325 
Extraordinary items, net of minority
  interest                                     --          (3,309)              --            --         --                   -- 
Minority interest in Operating
  Partnership                              (3,862)         (2,681)          (1,951)       (7,914)        (4,119)          (1,670) 
                                          --------        --------        --------        -----        ------          --------- 
Net income (loss) (2)                                 $    12,544      $     7,232                  $    18,060      $     5,655 
                                                                                                       ======          ========= 
Net income before extraordinary
  item (2)                            $    24,476                                    $    50,152
                                          ========                                         =====
Net income per share before
  extraordinary items                         .76     $       .64                           1.55
Net income per share of Common Stock                  $       .51      $       .51                  $      1.09      $      0.48 
Cash dividends declared per share of
  Common Stock                        $        --     $       .88      $       .82            --    $      1.24      $      0.96 
Cash dividends paid per share of
  Common Stock                        $        --     $       .84      $       .80   $        --    $      1.64      $      0.56 
Weighted average common shares
  outstanding                          32,368,263      24,682,042       14,085,977    32,368,263     16,525,245       11,816,380 
</TABLE>


<TABLE>
<CAPTION>
                                                           Predecessor 
                                       --------------------------------------------------
                                       For the Period
                                          January 1, 
                                           1994 to           Years Ended December 31, 
                                           May 25,      ---------------------------------
                                            1994          1993          1992       1991
                                       --------------   --------      --------   --------
                                         (dollars in thousands, except per share amounts)
<S>                                      <C>           <C>           <C>         <C>      
OPERATING INFORMATION: 
Revenue: 
 Rental income                           $  5,776      $ 14,315      $ 11,406    $ 14,850 
 Management fees                            1,521         3,533         3,331       2,205 
 Recoveries from tenants                    1,040         2,349         1,989       3,986 
 Mortgage interest income                      --            --            --          -- 
 Interest and other income                    675         2,176         2,003       3,134 
                                          --------      --------      --------      ----- 
   Total revenue                            9,012        22,373        18,729      24,175 
                                          --------      --------      --------      ----- 
Expenses: 
Property expenses                           2,086         4,580         4,522       6,390 
Real estate taxes                             595         1,354         1,204       1,162 
General and administrative                  1,399         4,357         4,658       4,528 
Mortgage interest expense                   2,798         7,650         7,203       7,532 
Interest--amortization of financing 
  costs                                       373           192           138         320 
Depreciation and amortization               2,385         5,577         5,505       4,967 
                                          --------      --------      --------      ----- 
   Total expenses                           9,636        23,710        23,230      24,899 
                                          --------      --------      --------      ----- 
Income (loss) from operations                (624)       (1,337)       (4,501)       (724) 
                                          --------      --------      --------      ----- 
Construction revenue and other 
  income                                   24,238        72,197        52,256      39,749 
Construction costs and operating 
  expenses                                 24,136        71,757        52,120      39,679 
                                          --------      --------      --------      ----- 
Income from construction                      102           440           136          70 
                                          --------      --------      --------      ----- 
Equity (loss) in joint ventures and 
  corporations (1)                            198        (5,953)       (1,544)         84 
Minority interest in loss of 
  combined partnerships                       931         1,539         2,656       1,087 
                                          --------      --------      --------      ----- 
Income (loss) before extraordinary 
  items                                       607        (5,311)       (3,253)        517 
Extraordinary items, net of minority 
  interest                                  8,898         1,554            --          -- 
Minority interest in Operating 
  Partnership                                  --            --            --          -- 
                                          --------      --------      --------      ----- 
Net income (loss) (2)                    $  9,505      $ (3,757)     $ (3,253)   $    517 
                                          ========      ========      ========      ===== 
Net income before extraordinary item 
  (2) 

Net income per share before 
  extraordinary items 
Net income per share of Common Stock           --            --            --          -- 
Cash dividends declared per share of 
  Common Stock                                 --            --            --          -- 
Cash dividends paid per share of 
  Common Stock 
Weighted average common shares 
  outstanding                                  --            --            --          -- 
</TABLE>


                                      S-50
<PAGE>
 

<TABLE>
<CAPTION>
                                                                           Company 
                                      --------------------------------------------------------------------------------------------
                                        Pro Forma
                                        Six Months       Six Months     Six Months                  For the Year    For the Period
                                           Ended           Ended           Ended          Pro           Ended       May 26, 1994 to
                                       June 30, 1996   June 30, 1996   June 30, 1995   Forma 1995    December 31,     December 31,
                                        (unaudited)     (unaudited)     (unaudited)    (unaudited)       1995            1994 
                                       -------------   -------------   -------------   ----------    ------------     ------------
                                                             (dollars in thousands, except per share amounts) 
<S>                                   <C>             <C>              <C>           <C>            <C>              <C>         
BALANCE SHEET
   INFORMATION:
Real estate before accumulated
  depreciation                        $ 1,051,924     $   824,924      $   415,654   $        --    $   471,142      $   400,419 
Total assets                            1,126,450         927,837          433,648            --        534,797          400,861 
Mortgage debt                             440,592         403,218           89,641            --         70,536           90,936 
Note Payable, Credit Facility              18,016              --           98,300            --        130,500          130,300 
Total liabilities                         507,246         451,856          220,749            --        239,013          261,100 
Total equity (deficit)                    548,543         426,930          174,923            --        258,822          102,038 
- ------------- 
(1) Including deductions for: 
       Depreciation and
        amortization                  $     1,994     $     1,994      $       832   $     3,895    $     2,306      $     3,013
       Interest--Amortization of 
        financing costs                       448             448      $       420   $       896    $       853      $       796
(2) Company share of Operating
      Partnership                            86.4%           85.5%            78.7%         86.4%          81.3%            77.2% 
</TABLE>





<TABLE>
<CAPTION>
                                                           Predecessor 
                                       --------------------------------------------------
                                       For the Period
                                          January 1, 
                                           1994 to           Years Ended December 31, 
                                           May 25,      ---------------------------------
                                            1994          1993          1992       1991
                                       --------------   --------      --------   --------
                                         (dollars in thousands, except per share amounts)
<S>                                      <C>           <C>           <C>         <C>      
BALANCE SHEET
   INFORMATION: 
Real estate before accumulated
  depreciation                           $ 82,198      $ 81,220      $ 78,580    $ 76,489 
Total assets                               77,470        85,497        93,327      84,978 
Mortgage debt                              69,240        87,091        86,610      85,189 
Note Payable, Credit Facility                  --            --            --          -- 
Total liabilities                         129,836       143,451       142,015     127,283 
Total equity (deficit)                    (52,366)      (57,954)      (48,688)    (42,305) 
- ------------- 
(1) Including deductions for: 
       Depreciation and
        amortization 
       Interest--Amortization of 
        financing costs 
(2) Company share of Operating 
      Partnership 
</TABLE>

                                      S-51
<PAGE>
 
                                   MANAGEMENT

Officers and Directors 

   The persons who are officers and Directors of the Company and their 
respective positions are as follows: 


        Name             Age                Position and Offices Held 
        ----             ---                ------------------------- 
Officers:                
Alan M. Leventhal         44      President, Chief Executive Officer and 
                                  Director 
Lionel P. Fortin          53      Senior Vice President and Chief Operating 
                                  Officer 
Douglas S. Mitchell       54      Senior Vice President--Leasing/Management and 
                                  Development 
Robert J. Perriello       53      Senior Vice President and Chief Financial 
                                  Officer 
James M. Becker           54      Senior Vice President--Design & Construction 
Donald B. Brooks          54      Senior Vice President and Chief Executive, 
                                  Beacon 
                                  Properties Southeast 
Charles H. Cremens        42      Senior Vice President and Chief Investment 
                                  Officer 
Carol G. Judson           44      Senior Vice President, Corporate Development 
Nancy J. Broderick        39      Vice President and Treasurer 
Steven D. Fessler         36      Vice President, Asset Management 
Claude B. Hoopes          46      Vice President, Leasing 
Henry Irwig               52      Vice President, Commercial Properties 
G. Douglas Lanois         35      Controller 
Erin R. O'Boyle           36      Vice President, Acquisitions 
Randy J. Parker           38      Vice President, Investor Relations 
James J. Whalen           33      Vice President, Information Systems 

Directors:
Edwin N. Sidman           53      Chairman of the Board and Director 
Norman B. Leventhal       78      Director 
Graham O. Harrison        71      Director 
William F. McCall, Jr.    60      Director 
Steven Shulman            54      Director 
Scott M. Sperling         37      Director 


   The following are biographical summaries of the experience of the officers 
and Directors of the Company: 

   Mr. Alan Leventhal serves as President, Chief Executive Officer and a 
Director of the Company. Mr. Leventhal joined Beacon in 1976 after receiving 
a degree in economics from Northwestern University in 1974 and a Master of 
Business Administration from the Amos Tuck School of Business Administration 
at Dartmouth College in 1976. Mr. Leventhal is a trustee of the Beth Israel 
Corporation, trustee of Boston University, trustee of the New England 
Aquarium Corporation and a member of the Visiting Committee of the College of 
Arts and Sciences at Northwestern University. He is also a member of the 
Board of Overseers of WGBH and the Museum of Science. Mr. Leventhal is the 
son of Norman B. Leventhal and the brother-in-law of Edwin N. Sidman. 

   Mr. Fortin serves as Senior Vice President and Chief Operating Officer of 
the Company. From May 1994 through February 1995, Mr. Fortin served as Chief 
Financial Officer of the Company. Before joining Beacon in 1973, Mr. Fortin 
was an Audit Supervisor with Laventhol & Horwath. Mr. Fortin graduated from 
Bentley College in 1968 and is a member of the American Institute of 
Certified Public Accountants and the Massachusetts Society of Certified 
Public Accountants. 


   Mr. Mitchell serves as the Senior Vice President-Leasing/Management and 
Development of the Company and as President of the Management Company. In 
these capacities, Mr. Mitchell is responsible for the overall leasing 
activities, property management and development activity of the Company. He 
joined Beacon in 1961. He graduated from the Wentworth Institute in 1962 and 
is a member of the Greater Boston Real Estate Board. Mr. Mitchell is also a 
licensed real estate broker in Massachusetts and New York. 



                                      S-52
<PAGE>

   Mr. Perriello serves as Senior Vice President and Chief Financial Officer of
the Company. He joined Beacon in 1970. During his career at Beacon, Mr.
Perriello has been responsible for many aspects of commercial development,
including the debt and equity financing of Beacon's Properties. Prior to joining
Beacon, he was a consulting engineer with Frederick R. Harris, Inc. in New York
City and served as an officer in the U.S. Army Corps of Engineers. Mr. Perriello
holds a Bachelor's degree in Civil Engineering from Rensselaer Polytechnic
Institute and a Master's of Business Administration from Harvard Business
School. His professional affiliations include membership in the Urban Land
Institute.


   Mr. Becker serves as Senior Vice President-Design & Construction of the 
Company. He joined Beacon in 1980. He is also President of Beacon 
Construction Company. At the Company he is responsible for design, 
construction management and general construction operations. Mr. Becker 
received both a Bachelor's and a Master's degree from Cornell University and 
a Doctorate in structural engineering from the University of California, 
Berkeley. He is a registered professional engineer in Massachusetts, 
President of the Associated General Contractors of Massachusetts and Chairman 
of the Engineering Center Educational Trust. 

   Mr. Brooks serves as Senior Vice President of the Company and Chief 
Executive, Beacon Properties Southeast. He joined the Company in June 1996. 
Prior to joining the Company, Mr. Brooks was a private investor, consultant 
and real estate advisor in the Atlanta area. He was President and Chief 
Operating Officer of The Landmarks Group in Atlanta from 1974 to 1986, 
responsible for the development of over 3 million square feet of office space 
in 30 buildings. Mr. Brooks holds a law degree and Bachelor degree in 
Accounting from Duke University. 

   Mr. Cremens serves as the Senior Vice President and Chief Investment 
Officer of the Company. He joined the Company in February 1996. Prior to 
joining the Company, Mr. Cremens served as President/Real Estate Investments 
with Aetna Life & Casualty Company and as Managing Director/Senior Officer 
Restructured Real Estate/OREO Departments at Bank of Boston. At the Company, 
Mr. Cremens is responsible for establishing and implementing a long-term 
acquisition and portfolio strategy for the Company. Mr. Cremens holds a 
Bachelor's degree from Williams College. 


   Ms. Judson serves as the Senior Vice President, Corporate Development of 
the Company. In this capacity, Ms. Judson is responsible for the Company's 
corporate development, human resources and administration. Before joining 
Beacon in 1980, Ms. Judson was Managing Director of the Brook House, a luxury 
apartment complex in Brookline, Massachusetts. Ms. Judson received her 
Bachelor of Science degree in mathematics and psychology from Curry College. 
She is a member of the Northeast Human Resources Association and the American 
Management Association. 

   Ms. Broderick serves as Vice President and Treasurer of the Company. In 
this capacity, Ms. Broderick is responsible for all financial operations of 
the Company including administration of the Credit Facility. Ms. Broderick 
joined Beacon in 1983. Ms. Broderick holds a Bachelor of Science degree in 
Accounting from Stonehill College and a Master of Science degree in Taxation 
from Bentley College. She is a certified public accountant and a member of 
the American Institute of Certified Public Accountants and the Massachusetts 
Society of Public Accountants. 


   Mr. Fessler serves as Vice President, Asset Management of the Company. In 
this capacity, Mr. Fessler has responsibility for the asset management of the 
Company's property portfolio. Mr. Fessler previously served the Company as 
Senior Development Manager and Vice President, Development. Prior to joining 
the Company, Mr. Fessler served as a Senior Investment Manager with Copley 
Real Estate Advisors. Mr. Fessler holds Bachelor's and Master's degrees from 
Stanford University. 

   Mr. Hoopes serves as Vice President, Leasing of the Company. In this 
capacity, Mr. Hoopes has responsibility for the overall leasing strategy and 
leasing performance of the Company's portfolio, as well as overseeing the 
leasing of the three million square feet of space managed and leased for 
third party institutional clients. Mr. Hoopes was previously a senior officer 
of The Landmarks Group, a major Atlanta developer, where he was responsible 
for six million square feet of leasing including an office park adjacent to 
the Perimeter Center Portfolio. Mr. Hoopes is a graduate of Princeton 
University. 



                                      S-53
<PAGE>
 
   Mr. Irwig serves as Vice President, Commercial Properties of the Company. In
this capacity, Mr. Irwig is responsible for the management of the Company's
property portfolio and integrating third-party and acquisition properties into
the Company's portfolio. Mr. Irwig joined Beacon in 1985 and since that time has
held various positions in other divisions of the Company relating to the
assessment, repositioning, design, construction and management of commercial and
institutional buildings. Mr. Irwig received his Bachelor of Architecture degree
and his Ph.D. from the University of Witwatersrand.

   Mr. Lanois serves as Controller of the Company. In this capacity, Mr. 
Lanois is responsible for financial reporting, budgeting and forecasting 
financial performance of the Company. Before joining Beacon in 1992, Mr. 
Lanois was the Manager of the Real Estate Advisory Service Group with 
Laventhal & Horwath and an Asset Manager with Aldrich, Eastman & Waltch. Mr. 
Lanois received his B.B.A. in Accounting and a B.S. in Hotel, Restaurant and 
Travel Administration from the University of Massachusetts, Amherst. He is a 
certified public accountant and serves on committees for the Greater Boston 
Real Estate Board and the Real Estate Finance Association. 


   Ms. O'Boyle serves as Vice President, Acquisitions of the Company. In this 
capacity, Ms. O'Boyle manages the search and negotiations for ownership 
opportunities. Ms. O'Boyle previously served the Company as Vice President, 
Asset Management. Ms. O'Boyle received her Bachelor of Science in structural 
engineering from the University of Delaware and her Master of Science in real 
estate development from the MIT Center for Real Estate Development. Ms. 
O'Boyle is the past chair of the Alumni Association for the MIT Center for 
Real Estate and is current President of the New England Women in Real Estate 
(NEWIRE). 

   Mr. Parker serves as Vice President, Investor Relations of the Company. He 
joined the Company in July 1996. Prior to joining the Company, Mr. Parker was 
Senior Vice President and Portfolio Manager of Aldrich, Eastman & Waltch in 
Boston, responsible for the management of over $400 million of investment 
portfolios on behalf of institutional clients. Mr. Parker holds a Master of 
Business Administration from The Wharton School, University of Pennsylvania 
and a Bachelor of Architecture degree from the University of Kentucky. 


   Mr. Whalen serves as Vice President, Information Systems of the Company. 
In this capacity, Mr. Whalen is responsible for overseeing the maintenance 
and support of corporate information systems, including an extensive internal 
computer network allowing efficient communications with the Properties. Mr. 
Whalen is a graduate of the University of Notre Dame and the recipient of the 
New York City Urban Fellowship. 


   Mr. Sidman serves as the Chairman of the Board and a Director of the 
Company. He is currently the Managing Partner of The Beacon Companies. Prior 
to joining Beacon in 1971, Mr. Sidman practiced law with the predecessor to 
the firm of Rubin and Rudman in Boston. Mr. Sidman graduated from the 
University of Michigan and holds a law degree from Harvard University. Mr. 
Sidman's professional affiliations include service as Senior Vice Chairman of 
the National Realty Committee. Mr. Sidman's civic commitment includes being a 
past Chairman of the Combined Jewish Philanthropies of Greater Boston, a 
member of the Board of Trustees of Duke University, a member of the Board of 
Directors and Executive Committee for the United Way of Massachusetts Bay, a 
member of the Executive Committee of the Artery Business Committee and a 
member of the Board of The Friends of Post Office Square. Mr. Sidman is the 
son-in-law of Norman B. Leventhal and the brother-in-law of Alan M. 
Leventhal. 


   Mr. Norman Leventhal serves as a Director of the Company. He is the 
co-founder and Chairman of Beacon. Mr. Leventhal is a graduate of the Boston 
Latin School and the Massachusetts Institute of Technology. At the 
Massachusetts Institute of Technology, he is a Life Member Emeritus of the 
Corporation and has served MIT in many capacities including as a Member of 
the Executive Committee, Member of the Investment Committee, and Chairman of 
the Corporation Visiting Committee for The School of Architecture and 
Planning. Mr. Leventhal is also an Honorary Life Member of the Board of 
Overseers of The Museum of Fine Arts and has been a Member of the Board of 
Trustees of The Museum of Science. Among other civic contributions, Mr. 
Leventhal has served as Chairman of The Artery Business Committee, is 
Chairman of The Friends of Post Office Square and is Chairman of the Trust 
for City Hall Plaza. Mr. Leventhal also serves as Director of Doubletree 
Corporation and Picower Institute for Medical Research. Mr. Leventhal is the 
father of Alan M. Leventhal and the father-in-law of Edwin N. Sidman. 

   Mr. Harrison serves as a Director of the Company. Mr. Harrison has served 
as Vice President and Chief Investment Officer of Howard Hughes Medical 
Institute ("Hughes") in Bethesda, Maryland from 1985 to 1994. Mr. Harrison 
retired as President of the U.S. Steel Pension Fund in June 1985, after 
thirty years of service, to take 

                                      S-54
<PAGE>
 
on the portfolio startup at Hughes. He also served as a Director of General 
Re Corporation in Stamford, Connecticut. Mr. Harrison serves as a Trustee of 
Property Capital Trust in Boston, a member of the Investment Advisory 
Committee of the New York State Common Retirement Fund, Warburg Pincus 
Investors, European Strategic Investors (London), Emerging World Investors 
L.P. and Desai Capital Management; Vice-Chairman of the Advisory Committee of 
Butler Capital, Chairman of the Swarthmore College Investment Committee, and 
member of Advisory Council--The Trust for Public Land. Mr. Harrison is a 
graduate of Swarthmore College and of Harvard Business School, and is a 
retired U.S. Air Force officer. 

   Mr. McCall serves as a Director of the Company. Mr. McCall has served as 
Chairman of McCall & Almy, Inc., Boston, Massachusetts, since 1989. Mr. 
McCall was a founder of Leggat McCall & Werner in 1965 and served as Chairman 
and Chief Executive Officer of Leggat McCall/Grubb & Ellis through 1989. Mr. 
McCall is currently a director of Citizens Bank of Massachusetts, Copley 
Properties, Inc., Jobs for Massachusetts and the Massachusetts Business 
Development Corporation. Mr. McCall is also a trustee of the Urban Land 
Institute and a member of the American Society of Real Estate Counselors. Mr. 
McCall is a graduate of The College of the Holy Cross. 

   Mr. Shulman serves as a Director of the Company. Since 1984, Mr. Shulman 
has been active in investment banking through his wholly owned company The 
Hampton Group. Currently, Mr. Shulman is a major shareholder and director in 
a diversified group of companies including Wilshire Restaurant Group, Inc., 
where he previously served as Chairman; Ermanco Incorporated; Holiday Farms 
Limited; and Corinthian Directory, Inc. Mr. Shulman also previously served as 
a director of Robertson-Ceco Corporation and Pullman, both NYSE companies. 
Mr. Shulman is a graduate of Stevens Institute of Technology where he 
received a Bachelor's degree in Mechanical Engineering and a Master's degree 
in Industrial Management. Mr. Shulman serves as Vice Chairman on the Board of 
Stevens Institute of Technology. 

   Mr. Sperling serves as a Director of the Company. Mr. Sperling joined 
Thomas H. Lee Co., a Boston-based investment firm, as a general partner in 
September 1994. Previously, Mr. Sperling served as Managing Partner and Vice 
Chairman of the Aeneas Group, Inc./Harvard Management Company from 1984 
through 1994. Mr. Sperling has been the founder and/or lead investor of 
numerous companies and has led the acquisition or turnaround of companies in 
a wide variety of industries. He is currently a director of Livent, 
PriCellular Corporation, Softkey International, KAI, Inc. and several private 
firms. He received a Master's of Business Administration from the Harvard 
Business School and received his undergraduate degree from Purdue University. 
Mr. Sperling is a member of the Corporation of the Brigham and Women's 
Hospital and a director of the American Technion Society. 

                                      S-55
<PAGE>
 
                                  UNDERWRITING

   Subject to the terms and conditions in the terms agreement and related 
underwriting agreement (collectively, the "Underwriting Agreement") among the 
Company and each of the underwriters named below (the "Underwriters"), the 
Company has agreed to sell to each of the Underwriters, for whom Merrill 
Lynch, Pierce, Fenner & Smith Incorporated ("Merrill Lynch"), Dean Witter 
Reynolds Inc., Donaldson, Lufkin & Jenrette Securities Corporation, Lehman 
Brothers Inc., PaineWebber Incorporated and Raymond James & Associates, Inc. 
are acting as representatives (the "Representatives"), and each of the 
Underwriters has severally agreed to purchase from the Company the respective 
number of shares of Common Stock set forth opposite their respective names. 


                                                                    Number 
                                                                      of 
             Underwriters                                           Shares 
             ------------                                           ------ 
Merrill Lynch, Pierce, Fenner & Smith 
       Incorporated 
Dean Witter Reynolds Inc. 
Donaldson, Lufkin & Jenrette Securities Corporation 
Lehman Brothers Inc. 
PaineWebber Incorporated 
Raymond James & Associates, Inc. 

                                                                  ------- 
     Total                                                      5,000,000 
                                                                  ======= 

   In the Underwriting Agreement, the several Underwriters have agreed, 
respectively, subject to the terms and conditions set forth in the 
Underwriting Agreement, to purchase all of the shares of Common Stock being 
sold pursuant to the Underwriting Agreement if any of such shares of Common 
Stock are purchased. Under certain circumstances, the commitments of 
non-defaulting Underwriters may be increased. 

   The Representatives have advised the Company that the Underwriters propose 
initially to offer the Common Stock to the public at the public offering 
price set forth on the cover page of this Prospectus Supplement and to 
certain dealers at such price less a concession not in excess of $     per 
share. The Underwriters may allow, and such dealers may reallow, a discount 
not in excess of $     per share on sales to certain other dealers. After the 
initial public offering, the public offering price, concession and discount 
may be changed. 

   The Company has granted to the Underwriters an option, exercisable for 30 
days after the date of this Prospectus Supplement, to purchase up to 750,000 
additional shares of Common Stock to cover over-allotments, if any, at the 
initial public offering price, less the underwriting discount set forth on 
the cover page of this Prospectus Supplement. If the Underwriters exercise 
this option, each Underwriter will have a firm commitment, subject to certain 
conditions, to purchase approximately the same percentage thereof which the 
number of shares of Common Stock to be purchased by it shown in the foregoing 
table bears to the shares of Common Stock initially offered hereby. 


   In the Underwriting Agreement, the Company has agreed to indemnify the 
Underwriters against certain liabilities, including liabilities under the 
Securities Act. Insofar as indemnification of the Underwriters for 
liabilities arising under the Securities Act may be permitted pursuant to the 
foregoing provisions, the Company has been informed that in the opinion of 
the SEC such indemnification is against public policy as expressed in the 
Securities Act and is therefore unenforceable. 


   The Company and the Operating Partnership have agreed that for a period of 
90 days from the date of this Prospectus Supplement they will not, subject to 
certain exceptions, without the prior written consent of Merrill Lynch, 
directly or indirectly, sell, offer or contract to sell, grant any option for 
the sale of, or otherwise dispose of any shares of Common Stock or Units or 
any security convertible into or exercisable for shares of Common Stock or 
Units. 


   The Common Stock is listed on the NYSE under the symbol "BCN." 

                                      S-56
<PAGE>
 
                                 LEGAL MATTERS


   Certain legal matters will be passed upon for the Company by Goodwin, 
Procter & Hoar LLP, Boston, Massachusetts, a limited liability partnership 
including professional corporations, as corporate, securities, real estate 
and tax counsel to the Company, and by Goulston & Storrs, Boston, 
Massachusetts, as real estate counsel to the Company. Gilbert G. Menna, whose 
professional corporation is a partner of Goodwin, Procter & Hoar LLP, is an 
assistant secretary of the Company and owns 1,000 shares of the Company's 
Common Stock. Certain legal matters related to the Offering will be passed 
upon for the Underwriters by Brown & Wood LLP, New York, New York. Brown & 
Wood LLP will rely on Goodwin, Procter & Hoar LLP, as to certain matters of 
Maryland law. 



                                     S-57
<PAGE>
 
PROSPECTUS 

                          Beacon Properties Corporation

                                  $500,000,000
                                  Common Stock

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

   Beacon Properties Corporation ("Beacon" or the "Company") may offer from 
time to time shares of its common stock, $.01 par value per share ("Common 
Stock"), with an aggregate public offering price of up to $500,000,000 in 
amounts, at prices and on terms to be determined at the time of offering. The 
Common Stock may be offered in amounts, at prices and on terms to be set 
forth in one or more supplements to this Prospectus (each a "Prospectus 
Supplement"). 

   The specific terms of the Common Stock for which this Prospectus is being 
delivered will be set forth in the applicable Prospectus Supplement and will 
include any initial public offering price. In addition, such specific terms 
may include limitations on direct or beneficial ownership and restrictions on 
transfer of the Common Stock, in each case as may be consistent with the 
Company's Articles of Incorporation, as then in effect, or otherwise 
appropriate to preserve the status of the Company as a real estate investment 
trust ("REIT") for federal income tax purposes. See "Restrictions on 
Transfers of Capital Stock." 

   The applicable Prospectus Supplement will also contain information, where 
appropriate, about certain United States federal income tax considerations 
relating to, and any listing on a securities exchange of, the Common Stock 
covered by such Prospectus Supplement. 

   The Common Stock may be offered by the Company directly to one or more 
purchasers, through agents designated from time to time by the Company or to 
or through underwriters or dealers. If any agents or underwriters are 
involved in the sale of any of the Common Stock, their names, and any 
applicable purchase price, fee, commission or discount arrangement between or 
among them, will be set forth, or will be calculable from the information set 
forth, in an accompanying Prospectus Supplement. See "Plan of Distribution." 
No Common Stock may be sold without delivery of a Prospectus Supplement 
describing the method and terms of the offering of such Common Stock. 

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

  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
       EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
      SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
          PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
              REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

              THE ATTORNEY GENERAL OF THE STATE OF NEW YORK HAS NOT
             PASSED ON OR ENDORSED THE MERITS OF THIS OFFERING. ANY
                   REPRESENTATION TO THE CONTRARY IS UNLAWFUL.

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

                 The date of this Prospectus is March 29, 1996.

<PAGE>
 
                             AVAILABLE INFORMATION

   The Company has filed with the Securities and Exchange Commission (the 
"SEC" or "Commission") a Registration Statement on Form S-3 (the 
"Registration Statement") under the Securities Act of 1933, as amended (the 
"Securities Act"), with respect to the Common Stock. This Prospectus, which 
constitutes part of the Registration Statement, omits certain of the 
information contained in the Registration Statement and the exhibits thereto 
on file with the Commission pursuant to the Securities Act and the rules and 
regulations of the Commission thereunder. The Registration Statement, 
including exhibits thereto, may be inspected and copied at the public 
reference facilities maintained by the Commission at 450 Fifth Street, N.W., 
Room 1024, Washington, D.C. 20549, and at the Commission's Regional Offices 
at 7 World Trade Center, 13th Floor, New York, New York 10048, and 
Northwestern Atrium Center, 500 W. Madison Street, Suite 1400, Chicago, 
Illinois 60661-2511, and copies may be obtained at the prescribed rates from 
the Public Reference Section of the Commission at its principal office in 
Washington, D.C. Statements contained in this Prospectus as to the contents 
of any contract or other document referred to are not necessarily complete, 
and in each instance reference is made to the copy of such contract or other 
document filed as an exhibit to the Registration Statement, each such 
statement being qualified in all respects by such reference. 

   The Company is subject to the informational requirements of the Securities 
Exchange Act of 1934, as amended (the "Exchange Act"), and in accordance 
therewith files reports and proxy statements and other information with the 
Commission. Such reports, proxy statements and other information can be 
inspected and copied at the locations described above. Copies of such 
materials can be obtained by mail from the Public Reference Section of the 
Commission at 450 Fifth Street, N.W., Room 1024, Washington, D.C. 20549, at 
prescribed rates. In addition, the Common Stock is listed on the New York 
Stock Exchange (the "NYSE"), and such materials can be inspected and copied 
at the NYSE, 20 Broad Street, New York, New York 10005. 

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

   The following documents are incorporated herein by reference: 

   1. The Company's Annual Report on Form 10-K for the year ended December 
31, 1995, filed with the Commission pursuant to the Exchange Act. 

   2. The Company's Current Report on Form 8-K, dated February 20, 1996, 
filed with the Commission pursuant to the Exchange Act, including all 
amendments thereto. 

   3. The description of the Company's Common Stock contained in its 
Registration Statement on Form 8-A filed with the Commission pursuant to the 
Exchange Act, including all amendments and reports updating such description. 

   All other documents filed with the Commission by the Company pursuant to 
Section 13(a), 13(c), 14 or 15(d) of the Exchange Act subsequent to the date 
of this Prospectus and prior to the termination of the offering of the Common 
Stock are to be incorporated herein by reference and such documents shall be 
deemed to be a part hereof from the date of filing of such documents. Any 
statement contained in this Prospectus or in a document incorporated or 
deemed to be incorporated by reference herein shall be deemed to be modified 
or superseded for purposes of this Prospectus to the extent that a statement 
contained herein or in any other subsequently filed document that also is or 
is deemed to be incorporated by reference herein modifies or supersedes such 
statement. Any statement so modified or superseded shall not be deemed, 
except as so modified or superseded, to constitute a part of this Prospectus. 

   Any person receiving a copy of this Prospectus may obtain, without charge, 
upon written or oral request, a copy of any of the documents incorporated by 
reference herein, except for the exhibits to such documents. Written requests 
should be mailed to Kathleen M. McCarthy, Beacon Properties Corporation, 50 
Rowes Wharf, Boston, Massachusetts 02110. Telephone requests may be directed 
to (617) 330-1400. 

                                        2
<PAGE>
 
                                  THE COMPANY

General 

   Beacon Properties Corporation along with its subsidiaries (the "Company") 
owns a portfolio of Class A office properties and other commercial properties 
located primarily in the greater Boston and Atlanta metropolitan areas. 
Beacon, a Maryland corporation, is a self-administered and self-managed real 
estate investment trust. Beacon's Common Stock is listed on the New York 
Stock Exchange under the symbol "BCN." 

   The Company's business is conducted principally through subsidiaries which 
consist of an operating partnership, three subsidiary corporations and two 
subsidiary limited partnerships. Beacon Properties, L.P. is a Delaware 
limited partnership (the "Operating Partnership"), of which the Company is 
the sole general partner. The Company conducts third-party management 
operations through Beacon Property Management Corporation, a Delaware 
corporation (the "Management Company"), conducts its construction operations 
through Beacon Construction Company, Inc., a Delaware corporation (the 
"Construction Company"), and conducts third-party tenant space design 
services through Beacon Design Corporation, a Massachusetts corporation (the 
"Design Company"). The Company conducts management operations for 
wholly-owned properties through Beacon Property Management, L.P., a Delaware 
limited partnership (the "Management Partnership") and conducts tenant space 
design services for wholly-owned properties through Beacon Design, L.P., a 
Delaware limited partnership (the "Design Partnership"). 

   The Company's executive offices are located at 50 Rowes Wharf in Boston, 
Massachusetts 02110 and its telephone number at that location is (617) 
330-1400. 

                                 USE OF PROCEEDS

   Unless otherwise described in the applicable Prospectus Supplement, the 
Company intends to use the net proceeds from the sale of Common Stock for 
general corporate purposes, including repayment of indebtedness, investment 
in new properties and new developments and maintenance of currently owned 
properties. 

                           DESCRIPTION OF COMMON STOCK

   The description of the Company's Common Stock set forth below does not 
purport to be complete and is qualified in its entirety by reference to the 
Company's Articles of Incorporation (the "Articles of Incorporation") and 
Bylaws (the "Bylaws"), each as amended, as in effect. 

General 

   Under the Articles of Incorporation, the Company has authority to issue 
100 million shares of Common Stock. Under Maryland law, stockholders 
generally are not responsible for the corporation's debts or obligations. At 
March 20, 1996, the Company had outstanding 27,272,481 shares of Common 
Stock. 

Terms 

   All shares of Common Stock offered hereby have been duly authorized, and 
are fully paid and non-assessable. Subject to the preferential rights of any 
other shares or series of stock and to the provisions of the Company's 
Articles of Incorporation regarding excess stock, $.01 par value per share 
("Excess Stock"), holders of shares of Common Stock will be entitled to 
receive dividends on shares of Common Stock if, as and when authorized and 
declared by the Board of Directors of the Company out of assets legally 
available therefor and to share ratably in the assets of the Company legally 
available for distribution to its stockholders in the event of its 
liquidation, dissolution or winding-up after payment of, or adequate 
provision for, all known debts and liabilities of the Company. 

   Subject to the provisions of the Company's Articles of Incorporation 
regarding Excess Stock, each outstanding share of Common Stock entitles the 
holder to one vote on all matters submitted to a vote of stockholders, 
including the election of Directors and, except as otherwise required by law 
or except as provided with respect to any other class or series of stock, the 
holders of Common Stock will possess the exclusive voting power. There is no 
cumulative voting in the election of Directors, which means that the holders 
of a majority of the outstanding shares of Common Stock can elect all of the 
Directors then standing for election, and the holders of the remaining shares 
of Common Stock will not be able to elect any Directors. 

                                        3
<PAGE>
 
Holders of Common Stock have no conversion, sinking fund or redemption 
rights, or preemptive rights to subscribe for any securities of the Company. 

   The Company intends to furnish its stockholders with annual reports 
containing audited consolidated financial statements and an opinion thereon 
expressed by an independent public accounting firm and quarterly reports for 
the first three quarters of each fiscal year containing unaudited financial 
information. 

   Subject to the provisions of the Company's Articles of Incorporation 
regarding Excess Stock, all shares of Common Stock will have equal dividend, 
distribution, liquidation and other rights, and will have no preference, 
appraisal or exchange rights. 

   Pursuant to the Maryland General Corporation Law (the "MGCL"), a 
corporation generally cannot dissolve, amend its Articles of Incorporation, 
merge, sell all or substantially all of its assets, engage in a share 
exchange or engage in similar transactions outside the ordinary course of 
business unless approved by the affirmative vote of stockholders holding at 
least two-thirds of the shares entitled to vote on the matter unless a lesser 
percentage (but not less than a majority of all of the votes to be cast on 
the matter) is set forth in the corporation's Articles of Incorporation. The 
Company's Articles of Incorporation do not provide for a lesser percentage in 
such situations. 

Restrictions on Ownership 

   For the Company to qualify as a REIT under the Internal Revenue Code of 
1986, as amended (the "Code"), not more than 50% in value of its outstanding 
capital stock may be owned, directly or indirectly, by five or fewer 
individuals (as defined in the Code to include certain entities) during the 
last half of a taxable year. To assist the Company in meeting this 
requirement, the Company may take certain actions to limit the beneficial 
ownership, directly or indirectly, by a single person of the Company's 
outstanding equity securities. See "Restrictions on Transfers of Capital 
Stock." 

Transfer Agent 

   The transfer agent and registrar for the Common Stock is Boston EquiServe. 

                  RESTRICTIONS ON TRANSFERS OF CAPITAL STOCK 

Restrictions on Transfers 

   In order for the Company to qualify as a REIT under the Code, among other 
things, not more than 50% in value of its outstanding capital stock may be 
owned, directly or indirectly, by five or fewer individuals (defined in the 
Code to include certain entities) during the last half of a taxable year 
(other than the first year) (the "Five or Fewer Requirement"), and such 
shares of capital stock must be beneficially owned by 100 or more persons 
during at least 335 days of a taxable year of 12 months (other than the first 
year) or during a proportionate part of a shorter taxable year. See "Federal 
Income Tax Considerations." In order to protect the Company against the risk 
of losing its status as a REIT on account of a concentration of ownership 
among its stockholders, the Articles of Incorporation, subject to certain 
exceptions, provide that no single holder may own, or be deemed to own by 
virtue of the attribution provisions of the Code, more than 6.0% (the 
"Ownership Limit") of the aggregate value of the Company's shares of Common 
Stock. Pursuant to the Code, Common Stock held by certain types of entities, 
such as pension trusts qualifying under Section 401(a) of the Code, United 
States investment companies registered under the Investment Company Act, 
partnerships, trusts and corporations, will be attributed to the beneficial 
owners of such entities for purposes of the Five or Fewer Requirement (i.e., 
the beneficial owners of such entities will be counted as holders). The 
Company's Articles of Incorporation limits such entities to holding no more 
than 9.9% of the aggregate value of the Company's shares of capital stock 
(the "Look-Through Ownership Limit"). Any transfer of shares of capital stock 
or of any security convertible into shares of capital stock that would create 
a direct or indirect ownership of shares of capital stock in excess of the 
Ownership Limit or the Look-Through Ownership Limit or that would result in 
the disqualification of the Company as a REIT, including any transfer that 
results in the shares of capital stock being owned by fewer than 100 persons 
or results in the Company being "closely held" within the meaning of Section 
856(h) of the Code, shall be null and void, and the intended transferee will 
acquire no rights to the shares of capital stock. The foregoing restrictions 
on transferability and ownership will not apply if the Board of Directors 
determines that it is no longer in the best interests of the Company to 
attempt to qualify, or to continue to qualify, as a REIT. The Board of 
Directors may, in its sole discretion, waive the Ownership Limit and the 
Look-Through Ownership Limit if evidence satisfactory to the Board of 
Directors and the Company's tax counsel is presented 

                                        4
<PAGE>
 
that the changes in ownership will not then or in the future jeopardize the 
Company's REIT status and the Board of Directors otherwise decides that such 
action is in the best interest of the Company. 

   Shares of capital stock owned, or deemed to be owned, or transferred to a 
stockholder in excess of the Ownership Limit or the Look-Through Ownership 
Limit will automatically be converted into shares of Excess Stock that will 
be transferred, by operation of law, to the Company as trustee of a trust for 
the exclusive benefit of the transferees to whom such shares of capital stock 
may be ultimately transferred without violating the Ownership Limit or the 
Look-Through Ownership Limit. While the Excess Stock is held in trust, it 
will not be entitled to vote, it will not be considered for purposes of any 
stockholder vote or the determination of a quorum for such vote, and, except 
upon liquidation, it will not be entitled to participate in dividends or 
other distributions. Any distribution paid to a proposed transferee of Excess 
Stock prior to the discovery by the Company that capital stock has been 
transferred in violation of the provisions of the Company's Articles of 
Incorporation shall be repaid to the Company upon demand. The Excess Stock is 
not treasury stock, but rather constitutes a separate class of issued and 
outstanding stock of the Company. The original transferee stockholder may, at 
any time the Excess Stock is held by the Company in trust, transfer the 
interest in the trust representing the Excess Stock to any person whose 
ownership of the shares of capital stock exchanged for such Excess Stock 
would be permitted under the Ownership Limit or the Look- Through Ownership 
Limit, at a price not in excess of (i) the price paid by the original 
transferee-stockholder for the shares of capital stock that were exchanged 
into Excess Stock, or (ii) if the original transferee-stockholder did not 
give value for such shares (e.g., the stock was received through a gift, 
devise or other transaction), the average closing price for the class of 
shares from which such shares of Excess Stock were converted for the ten days 
immediately preceding such sale or gift. Immediately upon the transfer to the 
permitted transferee, the Excess Stock will automatically be converted back 
into shares of capital stock of the class from which it was converted. If the 
foregoing transfer restrictions are determined to be void or invalid by 
virtue of any legal decision, statute, rule or regulation, then the intended 
transferee of any shares of Excess Stock may be deemed, at the option of the 
Company, to have acted as an agent on behalf of the Company in acquiring the 
Excess Stock and to hold the Excess Stock on behalf of the Company. 

   In addition, the Company will have the right, for a period of 90 days 
during the time any shares of Excess Stock are held by the Company in trust, 
to purchase all or any portion of the Excess Stock from the original 
transferee-stockholder at the lesser of (i) the price initially paid for such 
shares by the original transferee stockholder, or if the original 
transferee-stockholder did not give value for such shares (e.g., the shares 
were received through a gift, devise or other transaction), the average 
closing price for the class of stock from which such shares of Excess Stock 
were converted for the ten days immediately preceding such sale or gift, and 
(ii) the average closing price for the class of shares from which such shares 
of Excess Stock were converted for the ten trading days immediately preceding 
the date the Company elects to purchase such shares. The 90-day period begins 
on the date notice is received of the violative transfer if the original 
transferee-stockholder gives notice to the Company of the transfer or, if no 
such notice is given, the date the Board of Directors determines that a 
violative transfer has been made. 

   These restrictions will not preclude settlement of transactions through 
the NYSE. 

   Each stockholder shall upon demand be required to disclose to the Company 
in writing any information with respect to the direct, indirect and 
constructive ownership of capital stock as the Board of Directors deems 
necessary to comply with the provisions of the Code applicable to REITs, to 
comply with the requirements of any taxing authority or governmental agency 
or to determine any such compliance. 

   The Ownership Limit may have the effect of precluding acquisition of 
control of the Company unless the Board of Directors determines that 
maintenance of REIT status is no longer in the best interests of the Company. 

                      FEDERAL INCOME TAX CONSIDERATIONS 

   The Company believes it has operated, and the Company intends to continue 
to operate, in such a manner as to qualify as a REIT under the Code, but no 
assurance can be given that it will at all times so qualify. 

   The provisions of the Code pertaining to REITs are highly technical and 
complex. The following is a brief and general summary of certain provisions 
that currently govern the federal income tax treatment of the Company and its 
stockholders. For the particular provisions that govern the federal income 
tax treatment of the Company and its stockholders, reference is made to 
Sections 856 through 860 of the Code and the regulations thereunder. The 
following summary is qualified in its entirety by such reference. 

                                        5
<PAGE>
 
Under the Code, if certain requirements are met in a taxable year, a REIT 
generally will not be subject to federal income tax with respect to income 
that it distributes to its stockholders. If the Company fails to qualify 
during any taxable year as a REIT, unless certain relief provisions are 
available, it will be subject to tax (including any applicable alternative 
minimum tax) on its taxable income at regular corporate rates, which could 
have a material adverse effect upon its stockholders. 

   In any year in which the Company qualifies to be taxed as a REIT, 
distributions made to its stockholders out of current or accumulated earnings 
and profits will be taxed to stockholders as ordinary income except that 
distributions of net capital gains designated by the Company as capital gain 
dividends will be taxed as long-term capital gain income to the stockholders. 
To the extent that distributions exceed current or accumulated earnings and 
profits, they will constitute a return of capital, rather than dividend or 
capital gain income, and will reduce the basis for the stockholder's Common 
Stock with respect to which the distribution is paid or, to the extent that 
they exceed such basis, will be taxed in the same manner as gain from the 
sale of that Common Stock. 

   Investors are urged to consult their own tax advisors with respect to the 
appropriateness of an investment in the Common Stock offered hereby and with 
respect to the tax consequences arising under federal law and the laws of any 
state, municipality or other taxing jurisdiction, including tax consequences 
resulting from such investor's own tax characteristics. In particular, 
foreign investors should consult their own tax advisors concerning the tax 
consequences of an investment in the Company, including the possibility of 
United States income tax withholding on Company distributions. 

                             PLAN OF DISTRIBUTION 

   The Company may sell Common Stock through underwriters or dealers, 
directly to one or more purchasers, through agents or through a combination 
of any such methods of sale. 

   The distribution of the Common Stock may be effected from time to time in 
one or more transactions at a fixed price or prices, which may be changed, at 
market prices prevailing at the time of sale, at prices related to such 
prevailing market prices, or at negotiated prices. 

   In connection with the sale of Common Stock, underwriters or agents may 
receive compensation from the Company or from purchasers of Common Stock, for 
whom they may act as agents, in the form of discounts, concessions or 
commissions. Underwriters may sell Common Stock to or through dealers, and 
such dealers may receive compensation in the form of discounts, concessions 
or commissions from the underwriters and/or commissions from the purchasers 
for whom they may act as agents. Underwriters, dealers, and agents that 
participate in the distribution of Common Stock may be deemed to be 
underwriters under the Securities Act, and any discounts or commissions they 
receive from the Company and any profit on the resale of Common Stock they 
realize may be deemed to be underwriting discounts and commissions under the 
Securities Act. Any such underwriter or agent will be identified, and any 
such compensation received from the Company will be described, in the 
applicable Prospectus Supplement. 

   Any shares of Common Stock sold pursuant to a Prospectus Supplement will 
be listed on the NYSE, subject to official notice of issuance. 

   Under agreements into which the Company may enter, underwriters, dealers 
and agents who participate in the distribution of Common Stock may be 
entitled to indemnification by the Company against certain liabilities, 
including liabilities under the Securities Act. 

   Underwriters, dealers and agents may engage in transactions with, or 
perform services for, or be tenants of, the Company in the ordinary course of 
business. 

   In order to comply with the securities laws of certain states, if 
applicable, the Common Stock offered hereby will be sold in such 
jurisdictions only through registered or licensed brokers or dealers. In 
addition, in certain states Common Stock may not be sold unless they have 
been registered or qualified for sale in the applicable state or an exemption 
from the registration or qualification requirement is available and is 
complied with. 

   Under applicable rules and regulations under the Exchange Act, any person 
engaged in the distribution of the Common Stock offered hereby may not 
simultaneously engage in market making activities with respect to the Common 
Stock for a period of two business days prior to the commencement of such 
distribution. 

                                        6
<PAGE>
 
LEGAL MATTERS 


   Certain legal matters will be passed upon for the Company by Goodwin, 
Procter & Hoar LLP, Boston, Massachusetts, a limited liability partnership 
including professional corporations, as corporate, securities and tax counsel 
to the Company. Gilbert G. Menna, whose professional corporation is a partner 
of Goodwin, Procter & Hoar LLP, is an assistant secretary of the Company and 
owns 1,000 shares of the Company's Common Stock. 



                                   EXPERTS 


   The consolidated balance sheets of the Company as of December 31, 1995 and 
1994 and the related consolidated statements of operations, stockholders' 
equity and cash flows for the year ended December 31, 1995 and for the period 
from May 26, 1994 to December 31, 1994, and the combined statements of 
operations, owners' equity (deficit) and cash flows for the period January 1, 
1994 to May 25, 1994 and the year ended December 31, 1993 of The Beacon 
Group, predecessor to the Company, and the related financial statement 
schedules of the Company as of December 31, 1995, incorporated herein by 
reference from the Company's Annual Report on Form 10-K for the year ended 
December 31, 1995 have been so incorporated in reliance on the reports of 
Coopers & Lybrand L.L.P., independent accountants, given on the authority of 
that firm as experts in accounting and auditing. The statement of excess of 
revenues over specified operating expenses for Perimeter Center, Atlanta, 
Georgia for the year ended December 31, 1995, incorporated by reference 
herein from the Company's current report on Form 8-K dated February 20, 1996, 
has been so incorporated in reliance on the report of Coopers & Lybrand 
L.L.P., independent accountants, given on the authority of said firm as 
experts in accounting and auditing. The statements of excess of revenues over 
specified operating expenses for each of the Fairfax County Portfolio, AT&T 
Plaza, Tri-State International and 1333 H Street for the year ended December 31,
1995, incorporated by reference herein from the Company's current report on Form
8-K dated July 23, 1996, have been so incorporated in reliance on the report of 
Coopers & Lybrand L.L.P., independent accountants, given on the authority of 
said firm as experts in accounting and auditing.


                                        7
<PAGE>

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    No dealer, salesperson or other individual has been authorized to give 
any information or make any representations not contained or incorporated by 
reference in this Prospectus Supplement and the accompanying Prospectus in 
connection with the offer made by this Prospectus Supplement and the 
accompanying Prospectus. If given or made, such information or representation 
must not be relied upon as having been authorized by the Company or the 
Underwriters. This Prospectus Supplement and the accompanying Prospectus do 
not constitute an offer to sell, or a solicitation of an offer to buy, the 
Shares in any jurisdiction where, or to any person to whom, it is unlawful to 
make such offer or solicitation. Neither the delivery of this Prospectus 
Supplement and the accompanying Prospectus nor any sale made hereunder shall, 
under any circum- stances, create an implication that there has not been any 
change in the facts set forth in this Prospectus Supplement and the 
accompanying Prospectus or in the affairs of the Company since the date 
hereof. 

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

                                TABLE OF CONTENTS
                                                                           Page
                                                                           ----
             PROSPECTUS SUPPLEMENT 
Prospectus Supplement Summary                                               S-3
Risk Factors                                                               S-13
The Company                                                                S-19
Recent Developments                                                        S-19
Properties and Pending Acquisitions                                        S-23
Use of Proceeds                                                            S-46
Price Range of Common Stock and 
  Distribution History                                                     S-47
Capitalization                                                             S-48
Selected Financial Information                                             S-49
Management                                                                 S-52
Underwriting                                                               S-56
Legal Matters                                                              S-57
                   PROSPECTUS 
Available Information                                                         2
Incorporation of Certain Documents by 
  Reference                                                                   2
The Company                                                                   3
Use of Proceeds                                                               3
Description of Common Stock                                                   3
Restrictions on Transfers of Capital Stock                                    4
Federal Income Tax Considerations                                             5
Plan of Distribution                                                          6
Legal Matters                                                                 7
Experts                                                                       7

================================================================================

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                                5,000,000 Shares

                                BEACON PROPERTIES
                                   CORPORATION

                                  Common Stock

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

                              PROSPECTUS SUPPLEMENT

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

                               Merrill Lynch & Co.
                            Dean Witter Reynolds Inc.
                          Donaldson, Lufkin & Jenrette
                             Securities Corporation
                               Lehman Brothers 
                           PaineWebber Incorporated 
                               Raymond James & 
                               Associates, Inc. 

                                         , 1996 


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