GREAT LAKES REIT
424B5, 1998-12-17
REAL ESTATE INVESTMENT TRUSTS
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<PAGE>
                                                Filed Pursuant to Rule 424(b)(5)
                                                      Registration No. 333-49499
                             PROSPECTUS SUPPLEMENT
                    (TO PROSPECTUS DATED DECEMBER 16, 1998)
 
                                1,500,000 SHARES
 
                                GREAT LAKES REIT
 
 9 3/4% SERIES A CUMULATIVE REDEEMABLE PREFERRED SHARES OF BENEFICIAL INTEREST,
                            $.01 PAR VALUE PER SHARE
                   (LIQUIDATION PREFERENCE $25.00 PER SHARE)
                               -----------------
 
    Great Lakes REIT, a real estate investment trust formed under the laws of
the State of Maryland, is a fully-integrated, self-administered and self-managed
real estate company focused on acquiring, renovating, owning and operating
suburban office and light industrial properties primarily located within a
500-mile radius of metropolitan Chicago. We are offering to the public our
9 3/4% Series A Cumulative Redeemable Preferred Shares of Beneficial Interest.
The terms of the Series A Preferred Shares can be summarized as follows:
 
    - We will pay cumulative dividends on the Series A Preferred Shares, from
      the date of original issuance, in the amount of $2.4375 per share each
      year (equivalent to 9 3/4% of the $25.00 liquidation preference).
 
    - We will pay dividends on the Series A Preferred Shares quarterly,
      beginning on March 1, 1999.
 
    - We are not allowed to redeem the Series A Preferred Shares before December
      16, 2003, except to preserve our status as a real estate investment trust
      under federal income tax laws.
 
    - On and after December 16, 2003, we may, at our option, redeem the Series A
      Preferred Shares by paying the holder $25.00 per share, plus all accrued
      and unpaid dividends through the date of such redemption.
 
    - The Series A Preferred Shares have no stated maturity and will not be
      subject to any sinking fund or mandatory redemption and will not be
      convertible into any other securities of Great Lakes REIT.
 
    - Investors in the Series A Preferred Shares generally have no voting
      rights, except if we fail to pay dividends for six or more quarters.
 
    We have applied to list the Series A Preferred Shares for quotation on the
New York Stock Exchange under the symbol "GL PrA." If this application is
approved, trading of the Series A Preferred Shares is expected to begin on the
NYSE within a 30-day period following the initial delivery of the Series A
Preferred Shares.
 
    SEE "RISK FACTORS" ON PAGE S-3 OF THIS PROSPECTUS SUPPLEMENT AND BEGINNING
ON PAGE 4 OF THE ACCOMPANYING PROSPECTUS FOR A DISCUSSION OF CERTAIN FACTORS
THAT YOU SHOULD CONSIDER BEFORE YOU INVEST IN THE SERIES A PREFERRED SHARES
BEING SOLD WITH THIS PROSPECTUS SUPPLEMENT.
 
    NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS
PROSPECTUS SUPPLEMENT OR THE ACCOMPANYING PROSPECTUS IS TRUTHFUL OR COMPLETE.
ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
                                                                                  UNDERWRITING        PROCEEDS TO
                                                            PRICE TO PUBLIC         DISCOUNT            COMPANY
                                                           ------------------  ------------------  ------------------
<S>                                                        <C>                 <C>                 <C>
Per Share................................................        $25.00             $0.7875             $24.2125
Total....................................................     $37,500,000          $1,181,250         $36,318,750
</TABLE>
 
                              -------------------
 
    This offering is being underwritten by the Underwriters listed below on a
firm commitment basis, which means that they must purchase all of the Series A
Preferred Shares if any are purchased. The Underwriters reserve the right to
withdraw, cancel or modify such offer and to reject orders in whole or in part.
We expect that the Series A Preferred Shares will be ready for delivery on or
about December 23, 1998.
 
A.G. EDWARDS & SONS, INC.                                      WHEAT FIRST UNION
 
                            EVEREN SECURITIES, INC.
 
          THE DATE OF THIS PROSPECTUS SUPPLEMENT IS DECEMBER 16, 1998.
<PAGE>
                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
                          PROSPECTUS SUPPLEMENT                             PAGE
                                                                            ----
<S>                                                                         <C>
Prospectus Supplement Summary.............................................   S-3
 
Forward-Looking Statements................................................   S-7
 
Use of Proceeds...........................................................   S-7
 
Description of the Series A Preferred Shares..............................   S-8
 
Certain Federal Income Tax Considerations.................................  S-12
 
Underwriting..............................................................  S-14
 
Legal Matters.............................................................  S-15
 
<CAPTION>
 
                                PROSPECTUS
<S>                                                                         <C>
 
About this Prospectus.....................................................     2
 
Where You Can Find More Information.......................................     2
 
The Company...............................................................     3
 
Risk Factors..............................................................     4
 
  Dependence on Market Conditions in the Midwest Region...................     4
 
  Risks Related to Retention of Tenants and Ability to Rent Space Upon
    Lease Expirations.....................................................     4
 
  Risks Associated with the Recent Acquisition of Many of the Properties;
    Lack of Operating History.............................................     4
 
  Real Estate Financing Risks.............................................     4
 
  Real Estate Investment Risks............................................     5
 
  Risks of Acquisition, Renovation and Development Activities.............     6
 
  Dependence on Key Personnel.............................................     6
 
  Federal Income Tax Risks--Failure to Qualify as a Real Estate Investment
    Trust.................................................................     6
 
  Possible Adverse Effect of REIT Distribution Requirements...............     7
 
  Possible Adverse Effect of Failure of Operating Partnership to Qualify
    for Federal Income Tax Purposes.......................................     7
 
  Possible Anti-Takeover Effects of Maryland Law and Our Declaration of
    Trust and Bylaws......................................................     8
 
  Possible Adverse Effect of Losses Not Covered by Insurance..............     8
 
  Potential Liability for Environmental Contamination.....................     8
 
  Possible Adverse Effect of Market Interest Rates on Prices of
    Securities............................................................     9
 
Use of Proceeds...........................................................    10
 
Ratios of Earnings to Combined Fixed Charges and Preference Dividends.....    10
 
Description of Shares of Beneficial Interest..............................    11
 
Federal Income Tax Considerations.........................................    15
 
Plan of Distribution......................................................    35
 
Legal Matters.............................................................    36
 
Experts...................................................................    36
</TABLE>


<PAGE>
                         PROSPECTUS SUPPLEMENT SUMMARY
 
    This summary highlights information contained elsewhere in this Prospectus
Supplement and the accompanying Prospectus. Because this is a summary, it may
not contain all of the information that is important to you. You should read
this entire Prospectus Supplement and the accompanying Prospectus carefully
before deciding whether to invest in the Series A Preferred Shares.
 
                                  THE COMPANY
 
    Great Lakes REIT, a Maryland real estate investment trust (the "Company"),
is a fully-integrated, self-administered and self-managed real estate company
focused on acquiring, renovating, owning and operating suburban office and light
industrial properties primarily located within a 500-mile radius of metropolitan
Chicago (the "Midwest Region"). As of November 30, 1998, we owned and operated
40 properties (the "Properties") in the Chicago, Milwaukee, Minneapolis/St.
Paul, Detroit, Columbus, Cincinnati and Denver areas. We lease space to over 600
tenants in a variety of businesses. The Properties primarily consist of Class A
and Class B suburban office buildings and range in size from 15,000 to 370,000
rentable square feet. We have elected to be treated for federal income tax
purposes as a real estate investment trust (a "REIT"). This means that, if we
meet certain requirements under the Internal Revenue Code, we generally do not
pay federal income tax on our taxable income at the trust level.
 
    Our principal executive offices are located at 823 Commerce Drive, Suite
300, Oak Brook, Illinois 60523, telephone number (630) 368-2900.
 
                                  RISK FACTORS
 
    An investment in the Series A Preferred Shares involves various risks. Risk
factors that you should carefully consider include, but are not limited to, the
following:
 
    - Our Properties are concentrated in the Midwest Region of the United
      States. As a result of this concentration, if economic conditions worsen
      in the Midwest Region, they will significantly influence our future
      performance and could adversely affect our ability to make expected
      distributions to our shareholders, including dividends payable on the
      Series A Preferred Shares;
 
    - We may not be able to retain our existing tenants or rent space upon lease
      expirations, which will adversely affect our cash flow and our ability to
      make expected distributions to our shareholders, including dividends
      payable on the Series A Preferred Shares;
 
    - When we acquire new properties, we will expose ourselves to the risks that
      our investment will fail to generate expected returns and that the
      acquired properties may have certain defects that remain undetected before
      their acquisition;
 
    - Our cash flow may be insufficient to meet required payments of principal
      and interest under our outstanding indebtedness and we may not be able to
      refinance such indebtedness;
 
    - If our Properties do not generate revenues sufficient to meet our
      operating expenses, including debt service and capital expenditures, our
      cash flow and ability to pay distributions to our shareholders will be
      adversely affected, including dividends payable on the Series A Preferred
      Shares;
 
    - Our obligations to make dividend payments on the Series A Preferred Shares
      are subordinate to our obligations under any indebtedness currently
      outstanding or incurred in the future; and
 
    - If we fail to qualify as a REIT during a year, we will be subject to
      federal income tax at regular corporate rates for such year and possibly
      for the four subsequent years. If this happens, we could be subject to
      potentially significant tax liabilities, and the amount of cash available
      for distribution to shareholders would be reduced and possibly eliminated,
      including dividends payable on the Series A Preferred Shares.
 
                                      S-3
<PAGE>
    See "Risk Factors" beginning on page 4 of the accompanying Prospectus for a
discussion of factors that you should consider before you invest in the Series A
Preferred Shares being sold with this Prospectus Supplement.
 
                                  THE OFFERING
 
<TABLE>
<S>                                 <C>
Securities Offered................  1,500,000 shares of 9 3/4% Series A Cumulative
                                    Redeemable Preferred Shares of Beneficial Interest, $.01
                                    par value per share.
 
Price Per Share...................  $25.00.
 
Ranking...........................  With respect to the payment of dividends and amounts
                                    upon liquidation, the Series A Preferred Shares will
                                    rank senior to our common shares of beneficial interest
                                    ("Common Shares"), which are the only shares of
                                    beneficial interest of the Company currently
                                    outstanding. See "Description of the Series A Preferred
                                    Shares-- Series A Preferred Shares of Beneficial
                                    Interest--Dividends" and "--Liquidation Preference."
 
Use of Proceeds...................  We will use the net proceeds from the sale of the Series
                                    A Preferred Shares to reduce borrowings under our $150
                                    million unsecured revolving credit facility (the "Credit
                                    Facility"). See "Use of Proceeds."
 
Dividends.........................  Dividends on the Series A Preferred Shares are
                                    cumulative from the date of original issuance and are
                                    payable quarterly on the 1st day of each March, June,
                                    September and December, commencing on March 1, 1999, in
                                    the amount of $2.4375 per share each year (equivalent to
                                    9 3/4% of the $25.00 liquidation preference). The first
                                    dividend will cover the period from the date of issuance
                                    of the Series A Preferred Shares to March 1, 1999.
                                    Dividends on the Series A Preferred Shares will accrue
                                    whether or not we have earnings, whether or not we have
                                    funds legally available for the payment of such
                                    dividends and whether or not we declare such dividends.
                                    See "Description of the Series A Preferred Shares--
                                    Series A Preferred Shares of Beneficial
                                    Interest--Dividends."
 
Liquidation Preference............  The liquidation preference for each Series A Preferred
                                    Share is $25.00, plus an amount equal to all accrued and
                                    unpaid dividends to the date of payment. See
                                    "Description of the Series A Preferred Shares--Series A
                                    Preferred Shares of Beneficial Interest-- Liquidation
                                    Preference."
 
Redemption........................  Except in certain circumstances relating to the
                                    preservation of our status as a REIT (see "Description
                                    of Shares of Beneficial Interest--Restrictions on
                                    Transfer" in the accompanying Prospectus), we may not
                                    redeem the Series A Preferred Shares before December 16,
                                    2003. On and after December 16, 2003, at our option, we
                                    may redeem Series A Preferred Shares for cash, in whole
                                    or in part, by paying the holder $25.00 per share, plus
                                    all accrued and unpaid dividends thereon through the
                                    date fixed for redemption. The redemption price (other
                                    than the portion thereof consisting of accrued and
                                    unpaid dividends) will be payable solely out of the sale
                                    proceeds of our other shares of beneficial interest,
                                    which may include other series of preferred shares of
                                    beneficial interest, and from no other source. See
                                    "Description of the Series A
</TABLE>
 
                                      S-4
<PAGE>
 
<TABLE>
<S>                                 <C>
                                    Preferred Shares--Series A Preferred Shares of
                                    Beneficial Interest--Redemption."
 
Voting Rights.....................  As a holder of Series A Preferred Shares, you will
                                    generally have no voting rights. However, if we fail to
                                    pay dividends on any Series A Preferred Share for six or
                                    more quarterly periods, the number of trustees of the
                                    Company will increase by two. As a holder of Series A
                                    Preferred Shares, you will be entitled to vote,
                                    separately as a class with the holders of all other
                                    series of preferred shares of beneficial interest upon
                                    which like voting rights have been conferred and are
                                    exercisable, for the election of such two additional
                                    trustees to serve until we have fully paid all dividends
                                    accrued on the Series A Preferred Shares (or until we
                                    have declared such full dividends and set aside a
                                    sufficient sum for the payment thereof). See
                                    "Description of the Series A Preferred Shares-- Series A
                                    Preferred Shares of Beneficial Interest--Voting Rights."
 
Conversion........................  The Series A Preferred Shares are not convertible into
                                    or exchangeable for any other property or securities of
                                    Great Lakes REIT.
 
Ownership Restrictions............  Ownership by a person or certain groups of persons of
                                    more than 9.8% of any class or series of our shares of
                                    beneficial interest, including the Series A Preferred
                                    Shares, is restricted, among other reasons, in order to
                                    ensure that we preserve our status as a REIT for federal
                                    income tax purposes. See "Description of Shares of
                                    Beneficial Interest--Restrictions on Transfer" in the
                                    accompanying Prospectus.
 
Trading...........................  We have applied to list the Series A Preferred Shares on
                                    the NYSE under the symbol "GL PrA." If approved, trading
                                    of the Series A Preferred Shares is expected to commence
                                    on the NYSE within 30 days after the initial delivery of
                                    the Series A Preferred Shares.
</TABLE>
 
                                      S-5
<PAGE>
                  RATIOS OF EARNINGS TO COMBINED FIXED CHARGES
                            AND PREFERENCE DIVIDENDS
 
    The following table sets forth our consolidated ratios of earnings to
combined fixed charges and preference dividends for the periods shown:
 
<TABLE>
<CAPTION>
NINE MONTHS ENDED     YEAR ENDED        YEAR ENDED       YEAR ENDED       YEAR ENDED       YEAR ENDED
  SEPTEMBER 30,      DECEMBER 31,      DECEMBER 31,     DECEMBER 31,     DECEMBER 31,     DECEMBER 31,
      1998               1997              1996             1995             1994             1993
- -----------------  -----------------  ---------------  ---------------  ---------------  ---------------
<S>                <C>                <C>              <C>              <C>              <C>              <C>
         2.40               3.63              2.12             2.32             3.10             6.40
</TABLE>
 
    The ratios of earnings to combined fixed charges and preference dividends
were computed by dividing earnings by fixed charges. For this purpose, earnings
consist of income (loss) before gains from sales of property and extraordinary
items plus fixed charges. Fixed charges consist of interest expense (including
interest costs capitalized), the amortization of debt issuance costs and rental
expense deemed to represent interest expense. Great Lakes REIT did not have any
preference dividend requirements at any time during the five-year period ended
December 31, 1997 or during the nine-month period ended September 30, 1998.
 
                                      S-6
<PAGE>
                           FORWARD-LOOKING STATEMENTS
 
    Certain statements incorporated by reference or made in this Prospectus
Supplement or the accompanying Prospectus are "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. When we use the
words "anticipate," "assume," "believe," "estimate," "expect," "intend," and
other similar expressions in this Prospectus Supplement and in the accompanying
Prospectus or in the documents incorporated by reference in this Prospectus
Supplement and the accompanying Prospectus, they are generally intended to
identify forward-looking statements. You should not rely on forward-looking
statements since they involve known and unknown risks, uncertainties and other
factors that are, in some cases, beyond our control and that could materially
affect our actual results, performance or achievements. Factors that could cause
our actual results, performance or achievements to differ materially from those
expressed or implied by such forward-looking statements include, but are not
limited to, the matters discussed under the heading "Risk Factors" beginning on
page S-3 of this Prospectus Supplement and on page 4 of the accompanying
Prospectus.
 
                                USE OF PROCEEDS
 
    We estimate that we will receive net proceeds from this offering of
approximately $36.2 million, after deducting all anticipated issuance costs
payable by the Company. We intend to contribute the net proceeds of the sale of
the Series A Preferred Shares offered hereby to the Operating Partnership (as
defined in the accompanying Prospectus) in exchange for an equal number of
9 3/4% Series A Cumulative Redeemable Preferred Limited Partnership Interests in
the Operating Partnership. The Operating Partnership will use the net proceeds
to reduce borrowings under the Credit Facility, which borrowings were used to
finance property acquisitions and for general business purposes. As of December
15, 1998, outstanding indebtedness under the Credit Facility totaled
approximately $120.6 million. The Credit Facility bears interest at LIBOR plus
1.00% to 1.45% (6.51% at November 30, 1998) and matures in April 2001.
 
                                      S-7
<PAGE>
                  DESCRIPTION OF THE SERIES A PREFERRED SHARES
 
    In addition to the information below, you should also read the information
set forth under the caption "Description of Shares of Beneficial
Interest--Preferred Shares" in the accompanying Prospectus before deciding
whether to invest in the Series A Preferred Shares. However, if the terms set
forth in this Prospectus Supplement differ from the terms set forth in the
accompanying Prospectus, you should rely on the terms set forth in this
Prospectus Supplement. The following summary of the terms of the Series A
Preferred Shares does not purport to be complete and is qualified in its
entirety by reference to the Declaration of Trust and the Articles Supplementary
relating to the Series A Preferred Shares, copies of which have been filed with
the Securities and Exchange Commission (the "Commission"). See "Where You Can
Find More Information" in the accompanying Prospectus.
 
GENERAL
 
    We are authorized to issue up to 10,000,000 preferred shares of beneficial
interest ("Preferred Shares") in one or more series, with such terms,
preferences, conversion or other rights, voting powers, restrictions,
limitations as to dividends or other distributions, qualifications and terms or
conditions of redemption, in each case, if any, as are permitted by Maryland law
and as our Board of Trustees may set pursuant to our declaration of trust (the
"Declaration of Trust"), without any further vote or action by our shareholders.
See "Description of Shares of Beneficial Interest--Preferred Shares" in the
accompanying Prospectus. The Series A Preferred Shares are a series of our
Preferred Shares of Beneficial Interest.
 
    Our Board of Trustees has classified and designated 1,500,000 of our
Preferred Shares as 9 3/4% Series A Cumulative Redeemable Preferred Shares of
Beneficial Interest, $.01 par value per share. The following summary of the
terms and provisions of the Series A Preferred Shares does not purport to be
complete and is qualified in its entirety by reference to the pertinent sections
of the Declaration of Trust relating to the Preferred Shares and the Articles
Supplementary relating to the Series A Preferred Shares (the "Articles
Supplementary"), copies of each of which you may obtain from us.
 
    The transfer agent, registrar and dividend disbursing agent for the Series A
Preferred Shares will be Gemisys Corporation, Englewood, Colorado.
 
SERIES A PREFERRED SHARES OF BENEFICIAL INTEREST
 
    DIVIDENDS.  Holders of the Series A Preferred Shares will be entitled to
receive, when and as declared by the Board of Trustees, out of funds legally
available for the payment of dividends, cumulative preferential cash dividends
at the rate of 9 3/4% per annum of their $25.00 liquidation preference
(equivalent to a fixed annual amount of $2.4375 per share). Such dividends will
be cumulative from the date of original issue and will be payable quarterly in
arrears on the 1st day of each March, June, September and December or, if such
day is not a business day, the next succeeding business day (each, a "Dividend
Payment Date"). The first dividend, which will be paid on March 1, 1999, will
cover the period from the date of issuance of the Series A Preferred Shares to
March 1, 1999. Such dividend and any dividend payable on the Series A Preferred
Shares for any partial dividend period will be computed on the basis of a
360-day year consisting of twelve 30-day months. Dividends will be payable to
holders of record as they appear in our share records at the close of business
on the applicable record date, which will be the fifteenth day of the calendar
month immediately preceding the calendar month in which the applicable Dividend
Payment Date falls or on such other date designated by the Board of Trustees for
the payment of dividends that is not more than 30 nor less than 10 days prior to
such Dividend Payment Date (each, a "Dividend Record Date"). The Series A
Preferred Shares will rank senior to our Common Shares with respect to the
payment of dividends.
 
    No dividends on the Series A Preferred Shares will be authorized by the
Board of Trustees or paid or set apart for payment by the Company at such time
as the terms and provisions of any agreement of ours, including any agreement
relating to our indebtedness, prohibits such declaration, payment or setting
apart for payment or
 
                                      S-8
<PAGE>
provides that such declaration, payment or setting apart for payment would
constitute a breach thereof or a default thereunder, or if such declaration or
payment will be restricted or prohibited by law.
 
    Notwithstanding the foregoing, dividends on the Series A Preferred Shares
will accrue whether or not the terms and provisions of the Articles
Supplementary at any time prohibit the current payment of dividends, whether or
not we have earnings, whether or not there are funds legally available for the
payment of such dividends and whether or not such dividends are declared.
Accrued but unpaid dividends on the Series A Preferred Shares will accumulate as
of the Dividend Payment Date on which they first become payable. Except as set
forth in the next sentence, we will not declare or pay or set apart for payment
any dividends on any shares or any other series of Preferred Shares ranking, as
to dividends, on a parity with or junior to the Series A Preferred Shares (other
than a dividend in our Common Shares or in any other class of shares of
beneficial interest ranking junior to the Series A Preferred Shares as to
dividends and upon liquidation) for any period unless full cumulative dividends
have been or contemporaneously are declared and paid or declared and a sum
sufficient for the payment thereof is set apart for such payment on the Series A
Preferred Shares for all past dividend periods and the then current dividend
period. When dividends are not paid in full (and a sum sufficient for such full
payment is not so set apart) upon the Series A Preferred Shares and the shares
of any other series of Preferred Shares ranking on a parity as to dividends with
the Series A Preferred Shares, all dividends declared upon the Series A
Preferred Shares, and any other series of Preferred Shares ranking on a parity
as to dividends with the Series A Preferred Shares, will be declared on a
proportionate basis so that the amount of dividends declared per share of the
Series A Preferred Shares and such other series of Preferred Shares will in all
cases bear to each other the same ratio that accrued dividends per share on the
Series A Preferred Shares and such other series of Preferred Shares (which will
not include any accrual in respect of unpaid dividends for prior dividend
periods if such preferred shares do not have a cumulative dividend) bear to each
other. No interest, or sum of money in lieu of interest, will be payable in
respect of any dividend payment or payments on the Series A Preferred Shares
that may be in arrears.
 
    Except as provided in the immediately preceding paragraph, unless full
cumulative dividends on the Series A Preferred Shares have been or
contemporaneously are declared and paid, or declared and a sum sufficient for
the payment thereof is set apart for payment for all past dividend periods and
the then current dividend period, no dividends (other than in Common Shares or
other shares of beneficial interest ranking junior to the Series A Preferred
Shares as to dividends and upon liquidation) will be declared or paid or set
aside for payment nor will any other distribution be declared or made upon the
Common Shares, or any other shares of beneficial interest of the Company ranking
junior to or on a parity with the Series A Preferred Shares as to dividends or
upon liquidation, nor will any Common Shares, or any other shares of beneficial
interest of the Company ranking junior to or on a parity with the Series A
Preferred Shares as to dividends or upon liquidation, be redeemed, purchased or
otherwise acquired for any consideration (or any moneys be paid to or made
available for a sinking fund for the redemption of any such shares) by the
Company (except by conversion into or exchange for other shares of beneficial
interest of the Company ranking junior to the Series A Preferred Shares as to
dividends and upon liquidation). Holders of Series A Preferred Shares will not
be entitled to any dividend, whether payable in cash, property or shares of
beneficial interest, in excess of full cumulative dividends on the Series A
Preferred Shares as provided above. Any dividend payment made on the Series A
Preferred Shares will first be credited against the earliest accrued but unpaid
dividend due with respect to such shares which remains payable.
 
    LIQUIDATION PREFERENCE.  Upon any voluntary or involuntary liquidation,
dissolution or winding up of the affairs of the Company, the holders of Series A
Preferred Shares are entitled to be paid, out of such assets of ours that are
legally available for distribution to our shareholders, a liquidation preference
of $25.00 per share, plus an amount equal to any accrued and unpaid dividends to
the date of payment, before any distribution of assets is made to holders of
Common Shares or any other class or series of our shares of beneficial interest
that ranks junior to the Series A Preferred Shares as to liquidation rights.
After payment of the full amount of the liquidating distributions to which they
are entitled, the holders of Series A Preferred Shares will have no right or
claim to any of our remaining assets. Written notice of any such liquidation,
dissolution or winding up of the
 
                                      S-9
<PAGE>
Company, stating the payment date or dates when, and the place or places where,
the amounts distributable in such circumstances will be payable, will be given
by first class mail, postage pre-paid, not less than 30 nor more than 60 days
prior to the payment date stated therein, to each record holder of the Series A
Preferred Shares at the respective addresses of such holders as the same shall
appear in the share transfer records of trust. If we consolidate or merge with
or into any other corporation, trust or entity or if any other corporation,
trust or other entity consolidates or merges with or into us, or if all or
substantially all of our property or business is sold, leased or conveyed, we
will not be deemed to have been liquidated, dissolved or wound up. If we are not
the surviving entity of a consolidation, merger or otherwise, and the Series A
Preferred Shares remain outstanding and are exchangeable for a security of the
surviving entity with terms that are materially the same as the terms of the
Series A Preferred Shares, then the occurrence of such event will not be deemed
to materially or adversely affect the rights, preferences, privileges or voting
powers of the Series A Preferred Shares. The Series A Preferred Shares will rank
senior to the Common Shares with respect to payments upon liquidation. In
determining whether a distribution (other than upon voluntary or involuntary
liquidation) is permitted under Maryland law, amounts that would be needed, if
the Company were to be dissolved at the time of the distribution, to satisfy the
preferential rights upon dissolution of holders of Series A Preferred Shares
will not be added to the Company's total liabilities.
 
    REDEMPTION.  The Series A Preferred Shares are not redeemable before
December 16, 2003. However, in order to ensure that we remain a qualified REIT
for federal income tax purposes, Series A Preferred Shares owned by a person or
certain groups of persons in excess of the Aggregate Share Ownership Limit (as
such term is defined in the accompanying Prospectus), as applicable, may be
automatically transferred to a Charitable Trust (as such term is defined in the
accompanying Prospectus). See "Description of Shares of Beneficial
Interest--Restrictions on Transfer" in the accompanying Prospectus. On and after
December 16, 2003, we may, at our option upon not less than 30 nor more than 60
days written notice, redeem Series A Preferred Shares, in whole or in part, at
any time or from time to time, for cash at a redemption price of $25.00 per
share, plus all accrued and unpaid dividends thereon to the date fixed for
redemption (except as provided below), without interest. The redemption price of
the Series A Preferred Shares (other than the portion thereof consisting of
accrued and unpaid dividends) is payable solely out of the sale proceeds of
other shares of beneficial interest of the Company, which may include other
series of Preferred Shares, and from no other source. For purposes of the
preceding sentence, "shares of beneficial interest" means any equity securities
(including Common Shares and Preferred Shares), shares, interest, participation
or other ownership interests (however designated) and any rights (other than
debt securities convertible into or exchangeable for equity securities) or
options to purchase any of the foregoing. Holders of Series A Preferred Shares
to be redeemed will be obligated to surrender such Series A Preferred Shares at
the place designated in such notice and will be entitled to the redemption price
and any accrued and unpaid dividends payable upon such redemption following such
surrender. If notice of redemption of any Series A Preferred Shares has been
given and if we have set aside the funds necessary for such redemption in trust
for the benefit of the holders of any Series A Preferred Shares so called for
redemption, then from and after the redemption date, dividends will cease to
accrue on such Series A Preferred Shares, such Series A Preferred Shares will no
longer be deemed outstanding and all rights of the holders of such shares will
terminate, except the right to receive the redemption price. If less than all of
the outstanding Series A Preferred Shares are to be redeemed, the Series A
Preferred Shares to be redeemed will be selected on a proportionate basis (as
nearly as may be practicable without creating fractional shares) or by any other
equitable method we choose.
 
    Unless full cumulative dividends on all Series A Preferred Shares will have
been or contemporaneously are declared and paid, or declared and a sum
sufficient for the payment thereof set apart for payment for all past dividend
periods and the then current dividend period, we may not redeem any Series A
Preferred Shares unless all outstanding Series A Preferred Shares are
simultaneously redeemed in accordance with the preceding paragraph, and we may
not purchase or otherwise acquire directly or indirectly any Series A Preferred
Shares (except by exchange for shares of beneficial interest of the Company
ranking junior to the Series A Preferred Shares as to dividends and upon
liquidation); provided, however, that the foregoing will not prevent the
 
                                      S-10
<PAGE>
purchase or acquisition of Series A Preferred Shares pursuant to a purchase or
exchange offer made on the same terms to holders of all outstanding Series A
Preferred Shares.
 
    Notice of redemption will be given by publication in a newspaper of general
circulation in the City of New York, such publication to be made once a week for
two successive weeks commencing not less than 30 nor more than 60 days before
the redemption date. We will mail a similar notice, postage prepaid, not less
than 30 nor more than 60 days before the redemption date, addressed to the
respective holders of record of the Series A Preferred Shares to be redeemed at
their respective addresses as they appear in our share transfer records. No
failure to give such notice or any defect thereto or in the mailing thereof will
affect the validity of the proceedings for the redemption of any Series A
Preferred Shares, except as to the holder to whom notice was defective or not
given. Each notice will state: (i) the redemption date; (ii) the redemption
price; (iii) the number of Series A Preferred Shares to be redeemed; (iv) the
place or places where the Series A Preferred Shares are to be surrendered for
payment of the redemption price; and (v) that dividends on the shares to be
redeemed will cease to accrue on such redemption date. If less than all of the
Series A Preferred Shares held by any holder is to be redeemed, the notice
mailed to such holder will also specify the number of Series A Preferred Shares
held by such holder to be redeemed.
 
    The holders of Series A Preferred Shares at the close of business on a
Dividend Record Date will be entitled to receive the dividend payable with
respect to such Series A Preferred Shares on the corresponding Dividend Payment
Date notwithstanding the redemption thereof between such Dividend Record Date
and the corresponding Dividend Payment Date or our default in the payment of the
dividend due. Except as provided above, we will make no payment or allowance for
unpaid dividends, whether or not in arrears, on Series A Preferred Shares with
respect to which a redemption notice has been given.
 
    The Series A Preferred Shares have no stated maturity and will not be
subject to any sinking fund or mandatory redemption.
 
    VOTING RIGHTS.  Holders of the Series A Preferred Shares will not have any
voting rights, except as set forth below.
 
    Whenever dividends on any Series A Preferred Shares are in arrears for six
or more quarterly periods (a "Preferred Dividend Default"), the number of
trustees of the Trust will increase by two and the holders of such Series A
Preferred Shares (voting separately as a class with all other series of
Preferred Shares ranking on a parity with the Series A Preferred Shares as to
dividends or upon liquidation ("Parity Preferred") upon which like voting rights
have been conferred and are exercisable), will be entitled to vote for the
election of a total of two trustees of the Company (the "Preferred Shares
Trustees") at a special meeting called by the holders of record of at least 20%
of the Series A Preferred Shares or the holders of any other series of Parity
Preferred so in arrears (unless such request is received less than 90 days
before the date fixed for the next annual or special meeting of the
shareholders) or at the next annual meeting of shareholders, and at each
subsequent annual meeting until all dividends accrued on such Series A Preferred
Shares for the past dividend periods and the then current dividend period have
been fully paid or declared and a sum sufficient for the payment thereof set
aside for payment.
 
    If and when all accumulated dividends and the dividend for the then current
dividend period on the Series A Preferred Shares have been paid in full or set
aside for payment in full, the holders thereof will be divested of the foregoing
voting rights (subject to revesting in the event of each and every Preferred
Dividend Default) and, if all accumulated dividends and the dividend for the
then current dividend period have been paid in full or set aside for payment in
full on all series of Parity Preferred upon which like voting rights have been
conferred and are exercisable, the term of office of each Preferred Shares
Trustee so elected will terminate, and the number of trustees of the Trust will
decrease by two. Any Preferred Shares Trustee may be removed at any time with or
without cause by, and may not be removed otherwise than by, the vote of the
holders of record of a majority of the outstanding Series A Preferred Shares
when they have the voting rights described above (voting separately as a class
with all other series of Parity Preferred upon which like voting rights have
been conferred and are exercisable). So long as a Preferred Dividend Default
continues, any vacancy in the office of a Preferred
 
                                      S-11
<PAGE>
Shares Trustee may be filled by written consent of the Preferred Shares Trustee
remaining in office, or if none remains in office, by a vote of the holders of
record of a majority of the outstanding Series A Preferred Shares when they have
the voting rights described above (voting separately as a class with all other
series of Parity Preferred upon which like voting rights have been conferred and
are exercisable). The Preferred Shares Trustees will each be entitled to one
vote per trustee on any matter.
 
    So long as any shares of Series A Preferred Shares remain outstanding, we
will not, without the affirmative vote or consent of the holders of at least
two-thirds of the shares of the Series A Preferred Shares outstanding at the
time, given in person or by proxy, either in writing or at a meeting (voting
separately as a class), (i) authorize or create, or increase the authorized or
issued amount of, any class or series of shares of beneficial interest ranking
senior to the Series A Preferred Shares with respect to payment of dividends or
the distribution of assets upon liquidation, dissolution or winding up or
reclassify any authorized shares of beneficial interest of the Company into such
shares, or create, authorize or issue any obligation or security convertible
into or evidencing the right to purchase any such shares; or (ii) amend, alter
or repeal the provisions of the Declaration of Trust or the Articles
Supplementary, whether by merger, consolidation or otherwise (an "Event"), so as
to materially and adversely affect any right, preference, privilege or voting
power of the Series A Preferred Shares; provided, however, with respect to the
occurrence of any Event set forth in (ii) above, so long as the Series A
Preferred Shares remain outstanding with the terms thereof materially unchanged,
taking into account that upon the occurrence of an Event the Company may not be
the surviving entity, the occurrence of any such Event will not be deemed to
materially and adversely affect such rights, preferences, privileges or voting
power of the Series A Preferred Shares; and provided, further, that (a) any
increase in the amount of the authorized Preferred Shares or the creation or
issuance of any other series of Preferred Shares, or (b) any increase in the
amount of authorized shares of such series, in each case ranking on a parity
with or junior to the Series A Preferred Shares with respect to payment of
dividends or the distribution of assets upon liquidation, dissolution or winding
up, will not be deemed to materially and adversely affect such rights,
preferences, privileges or voting powers.
 
    The foregoing voting provisions will not apply if, at or before the time
when the act with respect to which such vote would otherwise be required has
been effected, all outstanding shares of Series A Preferred Shares have been
redeemed or called for redemption upon proper notice and sufficient funds have
been deposited in trust to effect such redemption.
 
    CONVERSION.  The Series A Preferred Shares are not convertible into or
exchangeable for any other property or securities of the Company.
 
    RESTRICTIONS ON OWNERSHIP.  For information regarding restrictions on
ownership of the Series A Preferred Shares, see "Description of Shares of
Beneficial Interest--Restrictions on Transfer" in the accompanying Prospectus.
 
                   CERTAIN FEDERAL INCOME TAX CONSIDERATIONS
 
DISTRIBUTIONS TO HOLDERS OF SERIES A CUMULATIVE REDEEMABLE PREFERRED SHARES.
 
    Distributions with respect to Series A Preferred Shares will be taxable as
described under the headings "Federal Income Tax Considerations--Taxation of
Taxable U.S. Shareholders," "--Taxation of Tax-Exempt Shareholders" and
"--Taxation of Non-U.S. Shareholders" in the accompanying Prospectus.
 
SALE OR REDEMPTION OF SERIES A PREFERRED SHARES.
 
    On the sale of shares of the Series A Preferred Shares, gain or loss will be
recognized by the holder in an amount equal to the difference between (i) the
amount of cash and fair market value of any property received on such sale, and
(ii) the holder's adjusted basis in the Series A Preferred Shares. Such gain or
loss will be capital gain or loss if the Series A Preferred Shares are held as
capital assets, and will be long-term gain or loss if such shares are held for
more than one year. See "Federal Income Tax Considerations--Taxation of Taxable
U.S.
 
                                      S-12
<PAGE>
Shareholders--Sale or Other Disposition of Shares" in the accompanying
Prospectus for a discussion of the effect of certain distributions on short term
capital loss treatment for shares held six months or less.
 
    A redemption of the Series A Preferred Shares will be treated under Section
302 of the Code as a distribution that is taxable at ordinary income tax rates
as a dividend (to the extent of current or accumulated earnings and profits),
unless the redemption satisfies certain tests set forth in Section 302(b) of the
Code enabling the redemption to be treated as a sale of the Series A Preferred
Shares. The redemption will satisfy such tests if it (i) is "substantially
disproportionate" with respect to the holder (which generally will not be the
case if only the Series A Preferred Shares are redeemed, since they generally do
not have voting rights), (ii) results in a "complete termination" of the
holder's shares of beneficial interest in the Company, or (iii) is "not
essentially equivalent to a dividend" with respect to the holder, all within the
meaning of Section 302(b) of the Code. In determining whether any of these tests
have been met, shares considered to be owned by the holder by reason of certain
constructive ownership rules set forth in the Code, as well as shares actually
owned, must generally be taken into account. Because the determination as to
whether any of the tests of Section 302(b) of the Code will be satisfied with
respect to any particular holder of the Series A Preferred Shares depends upon
the facts and circumstances at the time that the determination must be made,
prospective investors are advised to consult their own tax advisors to determine
such tax treatment.
 
    If a redemption of the Series A Preferred Shares is treated as a
distribution that is taxable as a dividend, the amount of the distribution will
be measured by the amount of cash and the fair market value of any property
received by the shareholder. The shareholder's adjusted tax basis in such
redeemed Series A Preferred Shares will be transferred to the holder's remaining
shareholdings in the Company. If, however, the shareholder has no remaining
shareholdings in the Company, such basis could be transferred to a related
person or it may be lost.
 
                                      S-13
<PAGE>
                                  UNDERWRITING
 
    Subject to the terms and conditions contained in the underwriting agreement
(the "Underwriting Agreement"), the Company has agreed to sell to A.G. Edwards &
Sons, Inc., Wheat First Union, a division of Wheat First Securities, Inc. and
EVEREN Securities, Inc. (the "Underwriters"), and each of the Underwriters has
severally agreed to purchase from the Company, the number of Series A Preferred
Shares set forth below opposite its respective name:
 
<TABLE>
<CAPTION>
                                                                                                  NUMBER OF
                                                                                             SERIES A PREFERRED
                                       UNDERWRITER                                                 SHARES
- -----------------------------------------------------------------------------------------  -----------------------
<S>                                                                                        <C>
A.G. Edwards & Sons, Inc.................................................................            500,000
Wheat First Union, a division of Wheat First Securities, Inc.............................            500,000
EVEREN Securities, Inc...................................................................            500,000
                                                                                                    --------
        Total............................................................................          1,500,000
                                                                                                    --------
                                                                                                    --------
</TABLE>
 
    Under the terms and conditions of the Underwriting Agreement, the
Underwriters are committed to take and pay for all of the shares offered by the
Underwriters hereby, if any are taken.
 
    The Company has been advised by the Underwriters that they propose to offer
the Series A Preferred Shares to the public at the 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 $0.50 per share and that the
Underwriters and such dealers may reallow a discount of not in excess of $0.25
per share to other dealers. The public offering price and the concession and
discount to dealers may be changed after the offering.
 
    The Company and the Operating Partnership, jointly and severally, have
agreed to indemnify the several Underwriters against certain liabilities,
including liabilities under the Securities Act, or to contribute to payments
that the Underwriters may be required to make in respect thereof.
 
    Application has been made to list the Series A Preferred Shares on the NYSE
under the symbol "GL PrA." If approved, trading of the Series A Preferred Shares
on the NYSE is expected to commence within 30 days of initial delivery of the
Series A Preferred Shares. Prior to the offering, there has been no public
market for the Series A Preferred Shares. While the Underwriters have advised
the Company that they intend to make a market in the Series A Preferred Shares
prior to commencement of trading on the NYSE, they are under no obligation to do
so and may discontinue market-making at any time without notice. No assurance
can be given that a market for the Series A Preferred Shares will exist prior to
commencement of trading or at any other time.
 
    The Underwriters have advised the Company that they do not intend to confirm
sales to any account over which they exercise discretionary authority.
 
    In connection with the Offering, certain Underwriters and selling group
members and their respective affiliates may engage in transactions that
stabilize, maintain or otherwise affect the market price of the Series A
Preferred Shares. Such transactions may include stabilization transactions
effected in accordance with Rule 104 of Regulation M promulgated by the
Commission pursuant to which such persons may bid for or purchase Series A
Preferred Shares for the purpose of stabilizing its market price. The
Underwriters also may create a short position for the account of the
Underwriters by selling more Series A Preferred Shares in connection with the
Offering than they are committed to purchase from the Company, and in such case
may purchase Series A Preferred Shares in the open market following completion
of the Offering to cover all or a portion of such short position. In addition,
A.G. Edwards & Sons, Inc., on behalf of the Underwriters, may impose "penalty
bids" under contractual arrangements with the Underwriters whereby it may
reclaim from an Underwriter (or any selling group member participating in the
Offering) for the account of the other Underwriters, the selling concession with
respect to Series A Preferred Shares that are distributed in the Offering but
subsequently purchased for the account of the Underwriters in the open market.
Any of the transactions described in this paragraph may result in the
maintenance of the price of the Series A Preferred Shares at a level above that
which
 
                                      S-14
<PAGE>
might otherwise prevail in the open market. None of the transactions described
in this paragraph are required and, if they are undertaken, they may be
discontinued at any time.
 
    Neither the Company nor any of the Underwriters makes any representation or
prediction as to the direction or magnitude or any effect that the transactions
described above may have on the price of the Series A Preferred Shares. None of
the Underwriters or the Company makes any representation that the Underwriters
will engage in such transactions or that such transactions, once commenced, will
not be discontinued without notice.
 
    Certain of the Underwriters and their affiliates have from time to time
performed, and may continue to perform in the future, investment banking
services for the Company, for which customary compensation has been received.
 
                                 LEGAL MATTERS
 
    Certain legal matters will be passed on for us by Jones, Day, Reavis &
Pogue, Chicago, Illinois, and certain matters of Maryland law, including the
validity of the Series A Preferred Shares offered hereby, will be passed on for
us by Ballard Spahr Andrews & Ingersoll, LLP, Baltimore, Maryland. Jones, Day,
Reavis & Pogue will rely on Ballard Spahr Andrews & Ingersoll, LLP as to certain
matters of Maryland law. Certain legal matters relating to the Offering will be
passed on for the Underwriters by Hunton & Williams, Richmond, Virginia.
 
                                      S-15
<PAGE>
                                   PROSPECTUS
 
                                  $300,000,000
 
                                GREAT LAKES REIT
 
       PREFERRED SHARES OF BENEFICIAL INTEREST, $.01 PAR VALUE PER SHARE
         COMMON SHARES OF BENEFICIAL INTEREST, $.01 PAR VALUE PER SHARE
 
                               ------------------
 
    We may offer to sell at one or more times, together or separately and in one
or more series, up to $300,000,000 of our Preferred Shares and Common Shares. We
will provide specific terms of the Securities that we may offer at any time in
supplements to this Prospectus. You should read this Prospectus and any
Prospectus Supplement carefully before you invest.
 
    The Common Shares are listed on the New York Stock Exchange under the symbol
"GL." The Prospectus Supplement will also contain information, where applicable,
as to any listing on a securities exchange of the Preferred Shares covered by
such Prospectus Supplement.
 
    SEE "RISK FACTORS" BEGINNING ON PAGE 4 OF THIS PROSPECTUS FOR A DISCUSSION
OF CERTAIN FACTORS THAT YOU SHOULD CONSIDER BEFORE YOU INVEST IN THE SECURITIES
BEING SOLD WITH THIS PROSPECTUS.
 
                             ---------------------
 
    NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS
PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
 
                             ---------------------
 
               The date of this Prospectus is December 16, 1998.
<PAGE>
                             ABOUT THIS PROSPECTUS
 
    This Prospectus is part of a registration statement that we filed with the
Securities and Exchange Commission (the "Commission") utilizing a "shelf"
registration process. This Prospectus does not contain all of the information
set forth in the registration statement and the exhibits and schedules thereto,
certain parts of which are omitted in accordance with the rules and regulations
of the Commission, and to which reference is hereby made. Under this "shelf"
registration process, we may sell any combination of the common shares of
beneficial interest ("Common Shares") and the preferred shares of beneficial
interest ("Preferred Shares" and, together with the Common Shares, the
"Securities") described in this Prospectus in one or more offerings up to a
total dollar amount of $300,000,000. This Prospectus provides you with a general
description of the Securities we may offer. Each time we offer to sell
Securities, we will provide a supplement to this Prospectus (a "Prospectus
Supplement") that will contain specific information about the terms of that
offering. The Prospectus Supplement may also add, update, or change information
contained in this Prospectus. You should read both this Prospectus and any
Prospectus Supplement together with the additional information described below
under the heading "Where You Can Find More Information."
 
                      WHERE YOU CAN FIND MORE INFORMATION
 
    Great Lakes REIT files annual, quarterly and special reports, proxy
statements and other information with the Commission. You may read and copy any
document filed by us at the Commission's Public Reference Rooms, 450 Fifth
Street, N.W., Washington, D.C. 20549, and at the Commission's regional offices
located at Seven World Trade Center, 13th Floor, New York, New York 10048 and
500 West Madison Street, Suite 1400, Chicago, Illinois 60661. Copies of such
material may be obtained at prescribed rates by writing the Commission, Public
Reference Section, 450 Fifth Street, N.W., Washington, D.C. 20549. Please call
the Commission at 1-800-SEC-0330 for further information on the Public Reference
Rooms. The Commission also maintains a Web site at http://www.sec.gov that
contains reports, proxy and information statements and other information
regarding registrants, including the Company, that file electronically with the
Commission. The Common Shares are listed on the NYSE, and reports, proxy
statements and other information concerning the Common Shares may also be
inspected at the offices of the New York Stock Exchange, Inc., 20 Broad Street,
New York, New York 10005.
 
    The Commission allows us to "incorporate by reference" the information we
file with it, which means that we can disclose important information to you by
referring you to those documents. The information incorporated by reference is
considered to be part of this Prospectus, and information that we file with the
Commission after the date of this Prospectus and prior to the termination of the
offering of the Securities will automatically update and supersede this
information. We incorporate by reference the Great Lakes REIT documents listed
below and any future filings made by us with the Commission under Sections
13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934, as amended,
until we sell all of the Securities.
 
    The following documents that we previously filed with the Commission under
the Exchange Act are hereby incorporated by reference in this Prospectus and
will be deemed to be a part of this Prospectus:
 
    1.  Our Annual Report on Form 10-K for the year ended December 31, 1997;
 
    2.  Our Quarterly Reports on Form 10-Q for the quarters ended March 31,
       1998, June 30, 1998 and September 30, 1998;
 
    3.  Our Current Report on Form 8-K/A dated February 6, 1998, filed with the
       Commission on February 20, 1998; our Current Report on Form 8-K dated
       April 17, 1998, filed with the Commission on April 20, 1998; our Current
       Report on Form 8-K dated April 21, 1998, filed with the Commission on
       April 24, 1998; our Current Report on Form 8-K dated May 22, 1998, filed
       with the Commission on June 4, 1998; our Current Report on Form 8-K/A
       dated June 18, 1998, filed with the Commission on June 19, 1998; our
       Current Report on Form 8-K/A dated July 24, 1998, filed with the
       Commission on
 
                                       2
<PAGE>
       July 24, 1998; and our Current Report on Form 8-K dated December 9, 1998,
       filed with the Commission on December 9, 1998.
 
    4.  The description of the Common Shares set forth in our Registration
       Statement on Form 8-A filed with the Commission on July 16, 1998,
       including any amendment or report filed for the purpose of updating such
       description.
 
    5.  The description of the 9 3/4% Series A Cumulative Redeemable Preferred
       Shares set forth in our Registration Statement on Form 8-A, filed with
       the Commission on December 16, 1998, including any amendment or report
       filed for the purpose of updating such description.
 
    You may request a copy of any and all of these filings, at no cost, by
writing or telephoning us at: Great Lakes REIT, Richard L. Rasley, Executive
Vice President, Co-General Counsel and Secretary, 823 Commerce Drive, Suite 300,
Oak Brook, Illinois 60523, telephone number (630) 368-2900.
 
    You should rely only on the information incorporated by reference or
provided in this Prospectus or any Prospectus Supplement. We have not authorized
anyone else to provide you with different or additional information. You should
not assume that the information in this Prospectus or any Prospectus Supplement
is accurate as of any date other than the date on the front of those documents.
 
                                  THE COMPANY
 
    IN 1996, WE ORGANIZED GREAT LAKES REIT, L.P. (THE "OPERATING PARTNERSHIP")
AND SUBSEQUENTLY TRANSFERRED ALL OF THE PROPERTIES (AS DEFINED HEREIN) TO THE
OPERATING PARTNERSHIP. AS THE SOLE GENERAL PARTNER OF THE OPERATING PARTNERSHIP,
WE HAVE EXCLUSIVE POWER TO MANAGE AND CONDUCT THE BUSINESS OF THE OPERATING
PARTNERSHIP, SUBJECT TO CERTAIN LIMITED EXCEPTIONS. ALTHOUGH THE COMPANY AND THE
OPERATING PARTNERSHIP ARE SEPARATE ENTITIES, UNLESS THE CONTEXT OTHERWISE
REQUIRES, ALL REFERENCES IN THIS PROSPECTUS TO THE "COMPANY" REFER TO THE
COMPANY, ITS PREDECESSOR AND THE OPERATING PARTNERSHIP, COLLECTIVELY.
 
    We are a fully integrated, self-administered and self-managed real estate
company focused on acquiring, renovating, owning and operating suburban office
and light industrial properties primarily located within a 500-mile radius of
metropolitan Chicago (the "Midwest Region"). As of November 30, 1998, we owned
and operated 40 properties (the "Properties") in the Chicago, Milwaukee,
Minneapolis, Detroit, Columbus, Cincinnati and Denver areas (the "Current
Markets"). The Properties primarily consist of Class A and Class B suburban
office properties and range in size from 15,000 to 370,000 rentable square feet.
The Company has elected to be treated for federal income tax purposes as a real
estate investment trust ("REIT").
 
                                       3
<PAGE>
                                  RISK FACTORS
 
    An investment in the Securities involves various risks. You should carefully
consider the following risk factors:
 
DEPENDENCE ON MARKET CONDITIONS IN THE MIDWEST REGION
 
    Of our Properties, 38 are located in the Midwest Region, including 19
located in the suburban Chicago, Illinois area. Like other real estate markets,
these commercial real estate markets have experienced economic downturns in the
past, and future declines could materially and adversely affect our operating
results and our ability to make expected distributions to shareholders.
Consequently, our financial performance and our ability to make distributions to
shareholders are therefore dependent on the economic conditions in the Midwest
Region, particularly in the Chicago area. Our revenues and the value of our
Properties may be affected by a number of factors, including local economic
conditions (which may be adversely affected by business layoffs or downsizing,
industry slowdowns, changing demographics and other factors) and local real
estate conditions (such as oversupply of or reduced demand for office,
industrial or other competing commercial properties). There can be no assurance
that the economies of the Midwest Region or the Chicago area will continue to
grow or that any future growth will meet historical growth rates.
 
RISKS RELATED TO RETENTION OF TENANTS AND THE ABILITY TO RENT SPACE UPON LEASE
  EXPIRATIONS
 
    Our activities are subject to the risks that upon expiration, leases may not
be renewed, the space may not be relet or the terms of renewal or reletting
(including the cost of required renovations) may be less favorable than the
expired lease terms. Leases on a total of approximately 10.4%, 17.1% and 17.7%
of the occupied rentable square feet of our Properties are scheduled to expire
in 1999, 2000 and 2001, respectively. If we are unable to promptly renew leases
for or relet all or a substantial portion of this space or if the rental rates
upon such renewal or reletting are significantly lower than expected, our cash
flow and ability to make distributions to shareholders would be adversely
affected.
 
RISKS ASSOCIATED WITH THE RECENT ACQUISITION OF MANY OF THE PROPERTIES; LACK OF
  OPERATING HISTORY
 
    Substantially all of our Properties have been under our management for less
than five years and 25 of our Properties have been acquired since January 1,
1996. Our most recently acquired properties may have characteristics or
deficiencies unknown to us that may impact their value or revenue potential. We
also cannot assure you that we will be able to effectively manage our most
recently acquired Properties.
 
    As we acquire additional properties, we will be subject to risks associated
with managing new properties, including lease-up and tenant retention. In
addition, our ability to effectively manage our growth will require us to
successfully integrate our new acquisitions into our existing management
structure. We cannot assure you that we will be able to successfully integrate
such properties or effectively manage additional properties, or that newly
acquired properties will perform as expected.
 
REAL ESTATE FINANCING RISKS
 
    POTENTIAL ADVERSE EFFECT OF INCREASED LEVERAGE.  Debt covenants in our
credit facilities limit the amount of debt we can incur, but our declaration of
trust and bylaws do not contain any such limitations. Because we do not have any
debt incurrence restrictions in our declaration of trust or bylaws, we could
increase the amount of outstanding indebtedness without the consent of our
shareholders at any time. Increased leverage would magnify our exposure to the
risks of indebtedness and interest rate fluctuation described below.
 
    POTENTIAL INABILITY TO REPAY OR REFINANCE INDEBTEDNESS AT MATURITY.  We are
subject to risks normally associated with debt financing, including the risk
that our cash flow will be insufficient to meet required payments of principal
and interest and the risk that we will be unable to refinance any indebtedness
or that the terms of any such refinancing will be less favorable than the terms
of the expiring indebtedness.
 
                                       4
<PAGE>
    POTENTIAL ADVERSE EFFECT OF RISING INTEREST RATES ON OUR VARIABLE RATE
DEBT.  Advances under our bank credit facility bear interest at variable rates
and the indebtedness under certain existing mortgage notes are subject to
periodic adjustments based on the then current market interest rates. In
addition, we may incur other variable rate indebtedness in the future. Increases
in interest rates on such indebtedness would increase our interest expense,
which could adversely affect our cash flow and amounts available for
distribution to shareholders.
 
REAL ESTATE INVESTMENT RISKS
 
    GENERAL REAL ESTATE OWNERSHIP RISKS.  If our Properties do not generate
revenues sufficient to meet our operating expenses, including debt service and
capital expenditures, our cash flow and ability to pay distributions to
shareholders will be adversely affected. The following factors, among others,
may adversely affect the revenues generated by our Properties:
 
    - the economic climate, particularly in the markets where we operate;
 
    - local real estate conditions;
 
    - the perceptions of prospective tenants of the attractiveness of our
      Properties;
 
    - our ability to manage and maintain our Properties and secure and maintain
      adequate insurance; and
 
    - increased operating costs (including real estate taxes and utilities).
 
Real estate values and income from properties are also affected by such factors
as applicable laws, including tax and environmental laws, interest rate levels
and the availability of capital.
 
    DIFFICULTY OF SELLING PROPERTIES.  Real estate can be hard to sell,
especially if local economic conditions are poor. This may limit our ability to
vary our portfolio promptly in response to changes in economic or other
conditions. In addition, federal tax laws limit our ability to sell properties
that we have owned for fewer than four years, and this may affect our ability to
sell properties without adversely affecting returns to our shareholders.
 
    IMPACT OF COMPETITION ON OCCUPANCY LEVELS AND RENTS CHARGED.  Numerous
office properties compete with our Properties in attracting tenants to lease
space. Some of the competing properties may be newer, better located or owned by
parties with greater financial resources than us. The number of competitive
properties in a particular area could adversely affect both our ability to lease
space in our Properties and the rents charged.
 
    POTENTIAL INCREASES IN CERTAIN TAXES AND REGULATORY COMPLIANCE
COSTS.  Because increases in income, service or transfer taxes are generally not
passed through to tenants under leases, such increases may adversely affect our
cash flow and our ability to make distributions to our shareholders. Our
Properties are also subject to various regulatory requirements, such as the
federal law that requires all public accommodations and commercial facilities to
meet certain federal requirements related to access and use by disabled persons,
and state and local fire and life safety requirements. If we fail to comply with
all applicable regulatory requirements, we may be fined by governmental
authorities or face private lawsuits. We believe that our Properties currently
comply with all such regulatory requirements. However, we cannot assure you that
these requirements will not be changed or that new requirements will not be
imposed that would require us to incur unanticipated costs that could adversely
affect our cash flow and ability to make distributions to shareholders.
 
    POTENTIAL ADVERSE EFFECT OF FINANCIAL CONDITION AND SOLVENCY OF TENANTS ON
OUR CASH FLOWS.  At any time, one of our tenants may declare bankruptcy, which
could result in rejection and termination of the tenant's lease and consequently
cause a reduction in our cash flow available for distribution. Although we have
not experienced material losses from tenant bankruptcies, we cannot assure you
that tenants will not declare bankruptcy in the future, or, if any tenants do,
that they will affirm their leases and continue to pay rent on time. In
addition, a tenant may experience a downturn in its business that may weaken its
financial condition and result in a failure to pay rent. If tenant leases are
not affirmed following bankruptcy or if a tenant's financial condition weakens,
our revenues and cash flows could be adversely affected.
 
                                       5
<PAGE>
RISKS OF ACQUISITION, RENOVATION AND DEVELOPMENT ACTIVITIES
 
    We intend to continue acquiring office properties and to renovate or expand
our Properties from time to time using integrated acquisition, renovation and
expansion policies. In addition to general investment risks associated with any
new real estate investment and the risk that we will be unable to successfully
integrate these policies, our acquisition, renovation and expansion policies are
subject to the following risks:
 
    - our Properties may fail to perform to expectations;
 
    - estimates of renovation costs and costs of improvements to bring an
      acquired property up to market standards may not be accurate;
 
    - we may not be able to obtain governmental and other approvals for
      renovation and expansion projects;
 
    - we may abandon projects we have already begun to explore;
 
    - we may not be able to obtain financing with favorable terms for future
      acquisitions and renovations;
 
    - we may expand our business to new geographic markets with which we are not
      familiar, which could adversely affect our ability to acquire, develop,
      manage or lease properties in any new markets; and
 
    - changing market conditions, including competition from other purchasers of
      properties similar to ours, may diminish our opportunities for attractive
      acquisitions.
 
    We may also develop and construct office buildings and other commercial
properties in accordance with our development policies. In March 1998, we
announced our agreement to acquire a mid-sized office building being constructed
in suburban Milwaukee. Our development activities are subject to the following
risks:
 
    - we may abandon projects we have already begun to explore;
 
    - we may incur construction or reconstruction costs for a property that
      exceed our original estimates due to increased material, labor or other
      costs, which could make completion of the property uneconomical;
 
    - occupancy rates and rents at a newly completed development or
      redevelopment property may be lower than anticipated due to a number of
      factors, including market and economic conditions, and may not be
      sufficient to make the property profitable;
 
    - we may not be able to obtain financing with favorable terms for future
      development or redevelopment activities;
 
    - we may be unable to complete construction or reconstruction and lease-up
      of a property on schedule, resulting in increased debt service expense and
      construction and reconstruction costs; and
 
    - we may be unable to obtain, or there may be delays in obtaining, all
      necessary zoning, land-use, building, occupancy and other required
      governmental approvals and authorizations.
 
In addition, new development activities typically require a substantial portion
of management's time and attention.
 
DEPENDENCE ON KEY PERSONNEL
 
    We are dependent on the efforts of our executive officers, particularly
Richard A. May, our Chief Executive Officer, Patrick R. Hunt, our President and
Chief Operating Officer, Richard L. Rasley, our Executive Vice President, and
Raymond M. Braun, our Senior Vice President-Acquisitions. Our operations,
financial condition and results of operations may be adversely affected by the
loss of their services.
 
FEDERAL INCOME TAX RISKS--FAILURE TO QUALIFY AS A REAL ESTATE INVESTMENT TRUST
 
    We believe that we have operated, and we intend to continue to operate in a
manner that will allow us to qualify as a REIT under the federal income tax
laws. Although we believe that we have been organized and our
 
                                       6
<PAGE>
past and present operations qualify us as a REIT, we cannot assure you that this
is true or that we will remain qualified as a REIT in the future. This is
because qualification as a REIT involves the application of highly technical and
complex Internal Revenue Code provisions for which there are only limited
judicial or administrative interpretations and involves the determination of
various factual matters and circumstances not entirely within our control.
 
    If we fail to qualify as a REIT during a year, we will be subject to federal
income tax at regular corporate rates for such year and possibly for the four
subsequent years. In this event, we could be subject to potentially significant
tax liabilities, and the amount of cash available for distribution to
shareholders would be reduced and possibly eliminated. Even if we qualify as a
REIT, we will be subject to certain federal, state and local taxes on our income
and property. In addition, if, during the 10-year period beginning on the first
day of the first taxable year for which we qualified as a REIT (the "Recognition
Period"), we recognize gain on the disposition of any asset held by us as of the
beginning of the Recognition Period, we generally will be subject to tax at the
regular corporate rate (currently 35%) on such gain.
 
POSSIBLE ADVERSE EFFECT OF REIT DISTRIBUTION REQUIREMENTS
 
    To maintain our status as a REIT for federal income tax purposes, we
generally are required each year to distribute to our shareholders at least 95%
of our taxable income. In addition, we will be subject to a 4% nondeductible
excise tax on the amount, if any, by which certain distributions made by us with
respect to any calendar year are less than the sum of 85% of our ordinary income
for such year plus 95% of our capital gain net income for such year plus 100% of
our undistributed income from prior taxable years.
 
    We intend to continue to make distributions to our shareholders to comply
with the 95% distribution requirement of the Internal Revenue Code and to avoid
the nondeductible excise tax described above. We anticipate that cash flow from
operations, including our share of distributions from the Operating Partnership,
will allow us to pay our operating expenses and meet the distribution
requirements of a REIT, but we cannot assure you that this will be the case. In
addition, differences in timing between the actual receipt of income and the
actual payment of expenses and the inclusion of such income and the deduction of
such expenses in arriving at our taxable income could leave us without
sufficient cash to allow us to meet the REIT distribution requirements. If the
Internal Revenue Service were to determine that we had failed to comply with the
95% distribution requirement for any taxable year, including any previous year,
we might be able to correct that failure by paying "deficiency dividends" to our
shareholders, as well as interest to the IRS, in a later taxable year. We may
not have enough cash to pay such "deficiency dividends." Accordingly, we could
be required to borrow funds or sell Properties on unfavorable terms. The
requirement to distribute a substantial portion of our taxable income could also
cause us to have to distribute amounts that would otherwise be spent on future
acquisitions, unanticipated capital expenditures or repayment of debt, which
would require additional borrowings or sales of assets to fund the costs of such
items and could restrict our ability to expand at the same pace as we have in
the past or at a rate necessary to remain competitive.
 
POSSIBLE ADVERSE EFFECT OF FAILURE OF OPERATING PARTNERSHIP TO QUALIFY AS A
  PARTNERSHIP FOR FEDERAL INCOME TAX PURPOSES
 
    We believe that the Operating Partnership has been organized as a
partnership and qualifies for treatment as such for federal income tax purposes.
Were the Operating Partnership instead taxable as a corporation, we would cease
to qualify as a REIT because of our inability to satisfy the REIT gross income
and asset tests, and the Operating Partnership would be subject to federal
income tax (including any applicable minimum tax) on its taxable income at
regular corporate rates. If the Operating Partnership was forced to pay a
corporate tax, the amount of cash available for distribution to us and our
shareholders would be reduced.
 
                                       7
<PAGE>
POSSIBLE ANTI-TAKEOVER EFFECTS OF MARYLAND LAW AND OUR DECLARATION OF TRUST AND
  BYLAWS
 
    Certain provisions of our declaration of trust and bylaws may have the
effect of delaying, deferring or preventing a third party from making an
acquisition proposal for us and may therefor inhibit a change in control. For
example, such provisions may deter tender offers for our shares of beneficial
interest, which offers may be attractive to our shareholders, or deter purchases
of large blocks of our shares of beneficial interest, thereby limiting the
opportunity for shareholders to receive a premium for their shares over
then-prevailing market prices.
 
    The business combination provisions and (if the exemption in our bylaws
referred to below is amended) the control share acquisition provisions of
Maryland law that are applicable to us and the advance notice provisions of our
bylaws could delay, defer or prevent a transaction or change in control that
might involve a premium price for holders of our shares of beneficial interest
or otherwise be in their best interest.
 
    CLASSIFIED BOARD OF TRUSTEES.  Our declaration of trust authorizes us to
have a Board of Trustees with three classes, each class of trustees serving
staggered three-year terms. Although we currently have no intention of
implementing a classified Board of Trustees, our Board of Trustees has the
discretion to do so. A classified Board of Trustees could delay, defer or
prevent a transaction or change in control that might involve a premium price
for holders of our shares of beneficial interest or otherwise be in their best
interest.
 
    BUSINESS COMBINATIONS.  Under Maryland law, certain "business combinations"
(including a merger, consolidation, share exchange or certain asset transfers or
issuances or reclassifications of securities) between us and any person who
beneficially owns ten percent or more of the voting power of our shares or an
affiliate of ours who, at any time within the two-year period prior to the date
in question, beneficially owned ten percent of the voting power of our
then-outstanding voting shares (an "Interested Shareholder"), or an affiliate of
such an Interested Shareholder, are prohibited for five years after the most
recent date on which the Interested Shareholder becomes an Interested
Shareholder. Thereafter, any such business combination generally must be
recommended by our Board of Trustees and approved by two super-majority votes of
our shareholders. These provisions of Maryland law do not apply, however, to
business combinations that are approved or exempted by resolution of our Board
of Trustees prior to the time that the Interested Shareholder becomes an
Interested Shareholder.
 
    CONTROL SHARE ACQUISITIONS.  Maryland law provides that "control shares" of
our company that are acquired in a "control share acquisition" have no voting
rights except to the extent approved by two-thirds of the votes of our
shareholders entitled to be cast on the matter, excluding shares of beneficial
interest owned by the acquiror, our officers or our trustees who are also
employed by us. Our bylaws contain a provision exempting from the control share
acquisition statute any and all acquisitions by any person of our shares of
beneficial interest. Our Board of Trustees may in the future amend or eliminate
this provision.
 
POSSIBLE ADVERSE EFFECT OF LOSSES NOT COVERED BY INSURANCE
 
    We carry comprehensive liability, fire, extended coverage and rental loss
insurance covering all of our Properties, with policy specifications and insured
limits that we believe are adequate and appropriate under the circumstances.
There are, however, certain types of losses that are not generally insured
because it is not economically feasible to insure against such losses. Should an
uninsured loss or a loss in excess of insured limits occur, we could lose our
capital invested in the property, as well as the anticipated future revenue from
the property and, in the case of debt with recourse to us, would remain
obligated for any mortgage debt or other financial obligation related to the
property. We would be adversely affected by any such loss.
 
POTENTIAL LIABILITY FOR ENVIRONMENTAL CONTAMINATION
 
    Under various federal, state and local environmental laws, a current or
previous owner or operator of real estate may be required (often regardless of
knowledge or responsibility) to investigate and remediate the effects of
hazardous or toxic substances or petroleum product releases at its properties,
and may be held liable to a
 
                                       8
<PAGE>
governmental entity or to third parties for property damage and for
investigation and remediation costs incurred by them in connection with the
contamination. These costs could be substantial. The presence of such substances
(or the failure to properly remediate the contamination) may materially and
adversely affect the owner's ability to borrow against, sell or rent the
affected property. In addition, certain environmental laws create liens on
contaminated sites in favor of the government for damages and costs it incurs in
connection with the contamination.
 
    All of our Properties have been subjected to a Phase I or similar
environmental assessment (which generally does not involve invasive techniques
such as soil or ground water sampling). These assessments have not revealed any
environmental conditions that we believe will have a material adverse effect on
our business, assets, financial condition or results of operations. We are not
aware of any other environmental conditions that would have such a material
adverse effect.
 
    We cannot assure you that:
 
    - the environmental assessments identified all potential environmental
      liabilities;
 
    - no prior owner created any material environmental condition not known to
      us or the consultants who prepared the assessments;
 
    - no environmental liabilities have developed since such environmental
      assessments were prepared;
 
    - the condition of the land or operations in the vicinity of our properties
      (such as the presence of underground storage tanks) will not affect the
      environmental condition of such communities; or
 
    - future uses or conditions (including, without limitation, changes in
      applicable environmental laws and regulations) will not result in the
      imposition of environmental liability.
 
POSSIBLE ADVERSE EFFECT OF MARKET INTEREST RATES ON PRICES OF SECURITIES
 
    One of the factors that will influence the market price of our Securities in
public markets will be the distribution rate on our Securities. To the extent
distribution rates do not increase sufficiently in response to increasing market
interest rates, such an increase in interest rates may adversely affect the
market price of our Securities.
 
                                       9
<PAGE>
                                USE OF PROCEEDS
 
    Unless otherwise specified in the applicable Prospectus Supplement, the net
proceeds from any sale of the Securities will be used for the acquisition and
development of additional office properties, as suitable opportunities arise,
for the repayment of certain outstanding indebtedness at such time, for capital
improvements to property, and for working capital and other general business
purposes.
 
                  RATIOS OF EARNINGS TO COMBINED FIXED CHARGES
                            AND PREFERENCE DIVIDENDS
 
    The Company's ratio of earnings to combined fixed charges and preference
dividends for the nine months ended September 30, 1998 was 2.40 and for the
years ended December 31, 1997, 1996, 1995, 1994 and 1993 was 3.63, 2.12, 2.32,
3.10 and 6.40, respectively.
 
    The ratios of earnings to combined fixed charges and preference dividends
were computed by dividing earnings by fixed charges. For this purpose, earnings
consist of income (loss) before gains from sales of property and extraordinary
items plus fixed charges. Fixed charges consist of interest expense (including
interest costs capitalized), the amortization of debt issuance costs and rental
expense deemed to represent interest expense. The Company did not have any
preference dividend requirements at any time during the five-year period ended
December 31, 1997 or during the nine months ended September 30, 1998.
 
                                       10
<PAGE>
                  DESCRIPTION OF SHARES OF BENEFICIAL INTEREST
 
    The following is a summary of the terms of the shares of beneficial interest
in the Company. This summary does not purport to be complete and is subject to
and qualified in its entirety by reference to the Company's declaration of
trust, as amended (the "Declaration of Trust"), and bylaws (the "Bylaws"),
copies of which are exhibits to the registration statement of which this
Prospectus forms a part.
 
GENERAL
 
    The Declaration of Trust authorizes the issuance of up to 70,000,000 shares
of beneficial interest in the Company, of which 60,000,000 are Common Shares and
10,000,000 are Preferred Shares. As of December 15, 1998, 16,752,925 Common
Shares were issued and outstanding and no Preferred Shares were issued and
outstanding.
 
COMMON SHARES
 
    All Common Shares offered hereby will be duly authorized, fully paid and
nonassessable. Subject to the preferential rights of any other class or series
of beneficial interest and to the provisions of the Declaration of Trust
regarding the restriction of the transfer of shares of beneficial interest,
holders of Common Shares are entitled to receive dividends on such shares if, as
and when authorized and declared by the Board of Trustees 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 shareholders 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 Declaration of Trust regarding the
restriction of the transfer of shares of beneficial interest, each outstanding
Common Share entitles the holder to one vote on all matters submitted to a vote
of shareholders, including the election of trustees, and, except as provided
with respect to any other class or series of shares, the holders of such shares
will possess the exclusive voting power. There is no cumulative voting in the
election of trustees, which means that the holders of a majority of the
outstanding Common Shares can elect all of the trustees then standing for
election and the holders of the remaining shares will not be able to elect any
trustees.
 
    Holders of Common Shares have no preference, conversion, exchange, sinking
fund, redemption or appraisal rights and have no preemptive rights to subscribe
for any securities of the Company. Subject to the provisions of the Declaration
of Trust regarding the restriction on transfer of shares of beneficial interest,
Common Shares will have equal dividend, liquidation and other rights.
 
    Under the Maryland REIT Law, a Maryland real estate investment trust
generally cannot dissolve, amend its declaration of trust or merge, unless
approved by the affirmative vote of shareholders 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 the votes entitled to be cast on the matter) is set
forth in the trust's Declaration of Trust. The Declaration of Trust provides for
approval in such situations by a majority of all of the votes entitled to be
cast on the matter. Under the Maryland REIT Law, a declaration of trust may
permit the trustees by a two-thirds vote to amend the declaration of trust from
time to time to qualify as a REIT under the Code or the Maryland REIT Law
without the affirmative vote or written consent of the shareholders. The
Company's Declaration of Trust permits such action by the Board of Trustees.
 
    The Declaration of Trust authorizes the Board of Trustees to reclassify any
unissued Common Shares into other classes or series of classes of beneficial
interest and to establish the number of shares in each class or series and to
set the preferences, conversion and other rights, voting powers, restrictions,
limitations as to dividends or other distributions, qualifications or terms or
conditions of redemption for each such class or series.
 
PREFERRED SHARES
 
    The Declaration of Trust authorizes the Board of Trustees to classify any
unissued Preferred Shares and to reclassify any previously classified but
unissued Preferred Shares of any series from time to time, in one or more
series, as authorized by the Board of Trustees. Prior to issuance of shares of
each series, the Board of Trustees is
 
                                       11
<PAGE>
required by the Maryland REIT Law and the Declaration of Trust of the Company to
set, subject to the provisions of the Declaration of Trust regarding the
restriction on transfer of shares of beneficial interest, the terms,
preferences, conversion or other rights, voting powers, restrictions,
limitations as to dividends or other distributions, qualifications and terms or
conditions of redemption for each such series. Thus, the Board could authorize
the issuance of Preferred Shares with terms and conditions which could have the
effect of delaying, deferring or preventing a transaction or a change in control
of the Company that might involve a premium price for holders of Common Shares
or otherwise be in their best interest.
 
POWER TO ISSUE ADDITIONAL COMMON SHARES AND PREFERRED SHARES
 
    The Company believes that the power of the Board of Trustees to issue
additional authorized but unissued Common Shares or Preferred Shares and to
classify or reclassify unissued Common or Preferred Shares and thereafter to
cause the Company to issue such classified or reclassified shares of beneficial
interest will provide the Company with increased flexibility in structuring
possible future financings and acquisitions and in meeting other needs which
might arise. The additional classes or series, as well as the Common Shares,
will be available for issuance without further action by the Company's
shareholders, unless such action is required by applicable law or the rules of
any stock exchange or automated quotation system on which the Company's
securities may be listed or traded. Although the Board of Trustees has no
intention at the present time of doing so, it could authorize the Company to
issue a class or series that could, depending upon the terms of such class or
series, delay, defer or prevent a transaction or a change in control of the
Company that might involve a premium price for holders of Common Shares or
otherwise be in their best interest.
 
RESTRICTIONS ON TRANSFER
 
    For the Company to qualify as a REIT under the Code, its shares of
beneficial interest must be beneficially owned by 100 or more persons during at
least 335 days of a taxable year of twelve months (other than the first year for
which an election to be a REIT has been made) or during a proportionate part of
a shorter taxable year. Also, not more than 50% in value of the outstanding
shares of beneficial interest may be owned, actually or constructively (under
the applicable attribution rules of the Code), by five or fewer individuals (as
defined in the Code to include certain tax-exempt entities other than, in
general, qualified domestic pension plans) at any time during the last half of
any taxable year of the Company (other than the first year for which an election
to be a REIT has been made). For taxable years of the Company beginning on and
after January 1, 1998, however, the Company's failure to satisfy this
requirement that the Company not be "closely held" will no longer result in the
Company's disqualification as a REIT so long as the Company has otherwise
complied with the requirements under the Code and the applicable Treasury
Regulations for ascertaining the actual ownership of its outstanding shares of
beneficial interest and maintaining records of such ownership, and the Company
did not know, and would not have known by exercising reasonable diligence, that
it actually failed to satisfy the requirement.
 
    The Declaration of Trust, subject to certain exceptions, contains certain
restrictions on the number of shares of beneficial interest of the Company that
a person may own. The Declaration of Trust prohibits any person from acquiring
or holding, actually or constructively, in excess of, in the case of Common
Shares, 9.8% of the total number of outstanding Common Shares and, in the case
of any class or series of Preferred Shares, 9.8% of the total number of
outstanding shares of such class or series of Preferred Shares (the "Aggregate
Share Ownership Limit"). For purposes of the Declaration of Trust, the term
"Equity Shares" means all shares of beneficial interest of the Company that are
either Common Shares or Preferred Shares.
 
    The Company's Board of Trustees, in its sole discretion, may exempt a person
from the Aggregate Share Ownership Limit (an "Excepted Holder"). However, the
Board of Trustees may not grant such an exemption to any person whose actual or
constructive ownership of Equity Shares in excess of the Aggregate Share
Ownership Limit would result in the Company being "closely held" within the
meaning of Section 856(h) of the Code or otherwise failing to qualify as a REIT.
In order to be considered by the Board of Trustees as an Excepted Holder, a
person also must not own, actually or constructively, an interest in a tenant of
the Company (or a tenant of any entity owned or controlled by the Company) that
would cause the Company to own, actually or constructively, more than a 9.8%
interest in such a tenant. The person seeking an exemption must represent to
 
                                       12
<PAGE>
the satisfaction of the Board of Trustees that it will not violate the two
aforementioned restrictions. The person also must agree that any violation or
attempted violation of any of the foregoing restrictions will result in the
automatic transfer of the Equity Shares causing such violation to the Charitable
Trust (as defined below). The Board of Trustees may require a ruling from the
Internal Revenue Service or an opinion of counsel, in either case in form and
substance satisfactory to the Board of Trustees in its sole discretion, in order
to determine or ensure the Company's status as a REIT.
 
    The Declaration of Trust further prohibits (a) any person from beneficially
or constructively owning Equity Shares that would result in the Company being
"closely held" under Section 856(h) of the Code or otherwise cause the Company
to fail to qualify as a REIT and (b) any person from transferring Equity Shares
if such transfer would result in Equity Shares being owned by fewer than 100
persons. Any person who acquires or attempts or intends to acquire beneficial or
constructive ownership of Equity Shares that will or may violate any of the
foregoing restrictions on transferability and ownership, or any person who would
have owned Equity Shares that resulted in a transfer of such Equity Shares to
the Charitable Trust, is required to give notice immediately to the Company and
provide the Company with such other information as the Company may request in
order to determine the effect of such transfer on the Company's status as a
REIT. The foregoing restrictions on transferability and ownership will not apply
if the Board of Trustees determines that it is no longer in the best interests
of the Company to continue to qualify as a REIT.
 
    If any transfer of Equity Shares occurs that, if effective, would result in
any person beneficially or constructively owning Equity Shares in excess or in
violation of the above transfer or ownership limitations (a "Prohibited Owner"),
then that number of Equity Shares the beneficial or constructive ownership of
which otherwise would cause such person to violate such limitations (rounded to
the nearest whole share) will be automatically transferred to a trust (the
"Charitable Trust") for the exclusive benefit of one or more charitable
beneficiaries (the "Charitable Beneficiary"), and the Prohibited Owner will not
acquire any rights in such shares. Such automatic transfer will be deemed to be
effective as of the close of business on the Business Day (as defined in the
Declaration of Trust) prior to the date of such violative transfer. Equity
Shares held in the Charitable Trust will be issued and outstanding Equity
Shares. The Prohibited Owner will not benefit economically from ownership of any
Equity Shares held in the Charitable Trust, will have no rights to dividends and
will not possess any rights to vote or other rights attributable to the Equity
Shares held in the Charitable Trust. The trustee of the Charitable Trust (the
"Charitable Trustee") will have all voting rights and rights to dividends or
other distributions with respect to Equity Shares held in the Charitable Trust,
which rights will be exercised for the exclusive benefit of the Charitable
Beneficiary. Any dividend or other distribution paid prior to the discovery by
the Company that Equity Shares have been transferred to the Charitable Trustee
will be paid by the recipient of such dividend or distribution to the Charitable
Trustee upon demand, and any dividend or other distribution authorized but
unpaid will be paid when due to the Charitable Trustee. Any dividend or
distribution so paid to the Charitable Trustee will be held in trust for the
Charitable Beneficiary. The Prohibited Owner will have no voting rights with
respect to Equity Shares held in the Charitable Trust and, subject to Maryland
law, effective as of the date that such Equity Shares have been transferred to
the Company, the Charitable Trustee will have the authority (at the Charitable
Trustee's sole discretion) (i) to rescind as void any vote cast by a Prohibited
Owner prior to the discovery by the Company that such shares have been
transferred to the Charitable Trust and (ii) to recast such vote in accordance
with the desires of the Charitable Trustee acting for the benefit of the
Charitable Beneficiary. However, if the Company has already taken irreversible
trust action, then the Charitable Trustee will not have the authority to rescind
and recast such vote.
 
    Within 20 days of receiving notice from the Company that Equity Shares have
been transferred to the Charitable Trust, the Charitable Trustee will sell the
Equity Shares held in the Charitable Trust to a person, designated by the
Charitable Trustee, whose ownership of the shares will not violate the ownership
limitations set forth in the Declaration of Trust. Upon such sale, the interest
of the Charitable Beneficiary in the shares sold will terminate and the
Charitable Trustee will distribute the net proceeds of the sale to the
Prohibited Owner and to the Charitable Beneficiary as follows. The Prohibited
Owner will receive the lesser of (i) the price paid by the Prohibited Owner for
the shares or, if the Prohibited Owner did not give value for the shares in
connection with the event causing the shares to be held in the Charitable Trust
(e.g., a gift, devise or other such transaction),
 
                                       13
<PAGE>
the Market Price (as defined in the Declaration of Trust) of such shares on the
day of the event causing the shares to be held in the Charitable Trust and (ii)
the price per share received by the Charitable Trustee from the sale or other
disposition of the shares held in the Charitable Trust. Any net sale proceeds in
excess of the amount payable to the Prohibited Owner will be paid immediately to
the Charitable Beneficiary. If, prior to the discovery by the Company that
Equity Shares have been transferred to the Charitable Trust, such shares are
sold by a Prohibited Owner, then (i) such shares will be deemed to have been
sold on behalf of the Company and (ii) to the extent that the Prohibited Owner
received an amount for such shares that exceeds the amount that such Prohibited
Owner was entitled to receive pursuant to the aforementioned requirement, such
excess will be paid to the Charitable Trustee upon demand.
 
    In addition, Equity Shares held in the Charitable Trust will be deemed to
have been offered for sale to the Company, or its designee, at a price per share
equal to the lesser of (i) the price per share in the transaction that resulted
in such transfer to the Charitable Trust (or, in the case of a devise or gift,
the Market Price at the time of such devise or gift) and (ii) the Market Price
on the date the Company, or its designee, accepts such offer. The Company will
have the right to accept such offer until the Charitable Trustee has sold the
Equity Shares held in the Charitable Trust. Upon such a sale to the Company, the
interest of the Charitable Beneficiary in the shares sold will terminate and the
Charitable Trustee will distribute the net proceeds of the sale to the
Prohibited Owner.
 
    All certificates evidencing Equity Shares will bear a legend referring to
the restrictions described above.
 
    Every owner of more than 5% (or such lower percentage as required by the
Code or the regulations promulgated thereunder) of all classes or series of the
Company's shares of beneficial interest, including Common Shares, within 30 days
after the end of each taxable year, is required to give written notice to the
Company stating the name and address of such owner, the number of shares of each
class and series of shares of beneficial interest of the Company that the owner
beneficially owns and a description of the manner in which such shares are held.
Each such owner will provide to the Company such additional information as the
Company may request in order to determine the effect, if any, of such beneficial
ownership on the Company's status as a REIT and to ensure compliance with the
Aggregate Share Ownership Limit. In addition, each shareholder will upon demand
be required to provide to the Company such information as the Company may
request, in good faith, in order to determine the Company's status as a REIT and
to comply with the requirements of any taxing authority or governmental
authority or to determine such compliance.
 
    These ownership limits could delay, defer or prevent a transaction or a
change in control of the Company that might involve a premium price for shares
of beneficial interest of the Company or otherwise be in the best interests of
the shareholders.
 
TRANSFER AGENT AND REGISTRAR
 
    The transfer agent and registrar for the Securities is Gemisys Corporation,
Englewood, Colorado.
 
                                       14
<PAGE>
                       FEDERAL INCOME TAX CONSIDERATIONS
 
    The following summary of the taxation of the Company and the material
federal income tax considerations that may be relevant to a prospective holder
of Securities is for general information only and does not constitute tax
advice. The summary sets forth the federal income tax consequences that are
likely to be material to a holder of Securities and has been prepared by Jones,
Day, Reavis & Pogue, special counsel to the Company.
 
    The tax treatment of a holder of Securities will vary depending upon the
holder's particular situation, and the discussion contained herein does not
purport to address all aspects of federal income taxation that may be relevant
to particular holders in light of their personal investment or tax
circumstances, or to certain types of holders (including insurance companies,
tax-exempt entities, financial institutions, broker-dealers in securities or
currencies or persons that hold Securities that are a hedge or that are hedged
against currency risks or that are part of a straddle or conversion transaction)
subject to special treatment under the federal income tax laws. The discussion
further assumes that Securities will be held as capital assets by the holders
thereof. Moreover, the discussion below does not consider the effect of any
foreign, state, local or other tax laws that may be applicable to a prospective
holder of Securities.
 
    The statements in this discussion and the opinion of Jones, Day, Reavis &
Pogue set forth below are based on the provisions of the Code, existing,
temporary, and proposed Treasury Regulations promulgated thereunder, the
legislative history of the Code, administrative rulings and practices of the
Internal Revenue Service (the "IRS"), and judicial decisions, all as in effect
on December 15, 1998. No assurance can be given that future legislative,
judicial, or administrative actions or decisions, which may be retroactive in
effect, will not affect the accuracy of any statements in this Prospectus with
respect to transactions entered into or contemplated prior to the effective date
of such changes.
 
    In order to convert the Company's predecessor, Great Lakes REIT, Inc. (the
"Corporation") from a Maryland corporation to a Maryland real estate investment
trust, the Corporation was merged with and into the Company on July 27, 1998,
with the Company being the surviving entity in the merger (the "Merger"). As
used in this section "Federal Income Tax Considerations," the term "Company"
does not include the Operating Partnership. Unless the context otherwise
specifically indicates, however, all references to the term "Company" in the
balance of this section are intended to include a reference to the Corporation
as it existed prior to the effective time of the Merger.
 
    If the Company offers one or more series of Preferred Shares, there may be
tax consequences for the holders of such Preferred Shares not discussed herein.
For a discussion of any such additional consequences, refer to the applicable
Prospectus Supplement.
 
    PROSPECTIVE PURCHASERS ARE ADVISED TO CONSULT THEIR OWN TAX ADVISORS
REGARDING THE SPECIFIC TAX CONSEQUENCES TO THEM OF THE PURCHASE, OWNERSHIP AND
SALE OF SECURITIES, INCLUDING THE FEDERAL, STATE, LOCAL, FOREIGN AND OTHER TAX
CONSEQUENCES OF SUCH PURCHASE, OWNERSHIP AND SALE, AND OF POTENTIAL CHANGES IN
APPLICABLE TAX LAWS.
 
GENERAL
 
    The Company elected to be taxed as a REIT commencing with its taxable year
ended December 31, 1993, and the Company believes that, commencing with its
taxable year ended December 31, 1993, it has been organized and has operated in
such a manner so as to qualify for taxation as a REIT under Sections 856 through
860 of the Code and the applicable Treasury Regulations promulgated thereunder,
which together set forth the requirements for qualifying as a REIT. The Company
intends to remain organized and to continue to operate in such a manner so as to
qualify for taxation as a REIT for federal income tax purposes in the future,
but no assurance can be given that the Company has so qualified or that the
Company will be able to remain so qualified.
 
                                       15
<PAGE>
    The Code sections and Treasury Regulations relating to the federal income
tax treatment of REITs and their shareholders are highly technical and complex.
The following discussion sets forth only the material aspects of those
provisions. This summary is qualified in its entirety by the applicable Code
sections, Treasury Regulations promulgated thereunder, and administrative and
judicial interpretations thereof.
 
    The Taxpayer Relief Act of 1997 (the "1997 Act") made certain changes to the
Code sections governing the federal income taxation of REITs and their
shareholders, which are generally effective for the Company's taxable years
beginning on and after January 1, 1998. In addition, the IRS Restructuring and
Reform Act of 1998 (the "1998 Act") made other changes to the Code that may
affect the federal income taxation of certain types of REITs and their
shareholders, which provisions have various effective dates. Some of these
changes may be material to a holder of Securities and are discussed below.
 
    Jones, Day, Reavis & Pogue has acted as special counsel to the Company in
connection with the preparation of this Prospectus. In the opinion of Jones,
Day, Reavis & Pogue, commencing with the Company's taxable year ended December
31, 1993, the Company (as the successor in interest to the Corporation pursuant
to the Merger) has been organized and has operated in conformity with the
requirements for qualification and taxation as a REIT under the Code, and the
Company's current and proposed organization and method of operation will enable
it to continue to meet the requirements for qualification and taxation as a REIT
under the Code for its current and subsequent taxable years. Investors should be
aware, however, that opinions of counsel are not binding upon the IRS or any
court. It must also be emphasized that the opinion of Jones, Day, Reavis & Pogue
is based upon various assumptions and certain representations made by the
Company as to factual matters relating to the organization and operation of the
Company and the Operating Partnership and to their business and properties as
set forth in this Prospectus and in the documents incorporated herein by
reference. Moreover, the Company's continued qualification and taxation as a
REIT depend upon the Company's continuing ability to meet (through, among other
things, actual annual operating results, asset ownership, distribution levels
and diversity of ownership of its shares of beneficial interest) the various
qualification tests imposed by the Code discussed below. Jones, Day, Reavis &
Pogue will not review the Company's compliance with these tests on an ongoing
basis. Accordingly, no assurance can be given that the actual results of the
Company's operations for any particular taxable year will satisfy the
requirements for qualification and taxation as a REIT. See "--Failure to
Qualify."
 
TAXATION OF THE COMPANY
 
    As a REIT, the Company generally is not subject to federal corporate income
tax on that portion of its net income that it currently distributes to its
shareholders. This treatment substantially eliminates the federal "double
taxation" on earnings (once at the corporate level and once again at the
shareholder level) that generally results from an investment in a regular
corporation (including a state law real estate investment or business trust
taxable as a corporation for federal income tax purposes). Even if, however, the
Company continues to qualify for taxation as a REIT, it will be subject to
federal income tax in certain circumstances as follows.
 
    - The Company will be taxed at regular corporate rates on any undistributed
      "REIT taxable income," including undistributed net capital gains.
 
    - Under certain circumstances, the Company may be subject to the corporate
      "alternative minimum tax" on its items of tax preference, if any.
 
    - If the Company has (i) net income from the sale or other disposition of
      "foreclosure property" that is held primarily for sale to customers in the
      ordinary course of business or (ii) other non-qualifying income from
      foreclosure property, the Company will be subject to tax on such income at
      the highest regular corporate rate.
 
    - If the Company has net income from "prohibited transactions" (which are,
      in general, certain sales or other disposition of property, other than
      foreclosure property, held primarily for sale to customers in the ordinary
      course of business), such income will be subject to a 100% tax.
 
                                       16
<PAGE>
    - If the Company should fail to satisfy the 75% gross income test or the 95%
      gross income test (as discussed below), but has nonetheless maintained its
      qualification as a REIT because certain other requirements have been met,
      the Company will be subject to a 100% tax on an amount equal to (i) the
      gross income attributable to the greater of the amount by which the
      Company failed the 75% or the 95% test, multiplied by (ii) a fraction
      intended to reflect the Company's profitability.
 
    - If the Company should fail to distribute during each calendar year at
      least the sum of (i) 85% of its REIT ordinary income for such year, (ii)
      95% of its REIT capital gain net income for such year, and (iii) any
      undistributed taxable income from prior years, the Company will be subject
      to a 4% excise tax on the excess of such required distribution over the
      amounts actually distributed.
 
    - If, during the 10-year period (the "Recognition Period") beginning on the
      first day of the first taxable year for which the Company qualified as a
      REIT, the Company recognizes gain on the disposition of any asset held by
      the Company as of the beginning of the Recognition Period, then, to the
      extent of the excess of (i) the fair market value of such asset as of the
      beginning of the Recognition Period, over (ii) the Company's adjusted tax
      basis in such asset as of the beginning of such Recognition Period (the
      "Built-In Gain"), such gain will be subject to tax at the highest regular
      corporate rate; provided, however, that the Company shall not be subject
      to tax on recognized Built-In Gain with respect to assets held as of the
      first day of the Recognition Period to the extent that the aggregate
      amount of such recognized Built-In Gain exceeds the net aggregate amount
      of the Company's unrealized Built-In Gain (i.e., aggregate unrealized
      gains less aggregate unrealized losses) with respect to such assets as of
      the first day of the Recognition Period.
 
    - If the Company acquires any asset from any corporation that is or has been
      a C Corporation (i.e., generally a corporation subject to full
      corporate-level tax) in certain transactions in which the tax basis of the
      asset in the hands of the Company is determined by reference to the
      adjusted tax basis of the asset (or any other property) in the hands of
      the C corporation, and the Company subsequently recognizes gain on the
      disposition of such asset during the Recognition Period beginning on the
      date on which the asset was acquired by the Company, then the Built-In
      Gain with respect to such asset will be subject to tax at the highest
      regular corporate rate.
 
REQUIREMENTS FOR QUALIFICATION
 
    ORGANIZATIONAL REQUIREMENTS.  The Code defines a REIT as a corporation,
trust, or association (i) that is managed by one or more trustees or directors;
(ii) the beneficial ownership of which is evidenced by transferable shares or by
transferable certificates of beneficial interest; (iii) that would be taxable as
a domestic corporation, but for compliance with Sections 856 through 859 of the
Code; (iv) that is neither a financial institution nor an insurance company
subject to certain special provisions of the Code; (v) the beneficial ownership
of which is held by 100 or more persons; (vi) at any time during the last half
of each taxable year of such entity, not more than 50% in value of the
outstanding stock or shares of beneficial interest of which is owned, actually
or constructively (under the applicable attribution rules of the Code), by or
for five or fewer individuals (as defined in the Code to include certain
tax-exempt entities other than, in general, qualified domestic pension funds);
(vii) that complied, for its taxable years beginning on or prior to August 5,
1997, with certain record keeping requirements of the Code and the Treasury
Regulations promulgated thereunder; and (viii) that meets certain other tests,
described below, regarding the nature of its gross income and assets. The Code
provides that conditions (i) through (iv), inclusive, must be met during the
entire taxable year and that condition (v) must be met during at least 335 days
of a taxable year of 12 months, or during a proportionate part of a taxable year
of less than 12 months. As a result of changes made by the 1997 Act, for taxable
years of the Company beginning on or after January 1, 1998, the Company will be
treated as having satisfied condition (vi) so long as it has otherwise complied
with the requirements under the Code and the applicable Treasury Regulations for
ascertaining the actual ownership of its outstanding shares of beneficial
interest and maintaining records of such ownership, and the Company did not
know, and would not have known by exercising reasonable diligence, that it
actually failed to meet the condition.
 
                                       17
<PAGE>
    The Company believes that it has satisfied the conditions set forth above
for each of its taxable years commencing with the taxable year ended December
31, 1993, and that it will continue to do so. With respect to the share
ownership requirements described in (v) and (vi) above, the Declaration of Trust
provides for restrictions on the ownership and transfer of Common Shares and
Preferred Shares that are intended to assist the Company in continuing to
satisfy these requirements. Such ownership and transfer restrictions are
described above under the heading "Description of Shares of Beneficial
Interest--Restrictions on Transfer." It should be emphasized, however, that the
ownership and transfer restrictions in the Corporation's Charter, prior to its
amendment and restatement in September 1997, and the ownership and transfer
restrictions in the Corporation's Bylaws did not ensure that the Corporation in
fact satisfied the share ownership requirements described above for its taxable
years commencing prior to January 1, 1998, primarily because the provisions in
the Charter did not operate automatically to void any attempted transfer,
acquisition or ownership of shares of the Corporation's stock that would result
in the disqualification of the Corporation as a REIT but instead required the
Corporation's Board of Directors to take action to prohibit or deem to be null
and void any such attempted transfer, acquisition or ownership of such shares or
to purchase or redeem any such shares. Particularly after the shares of common
stock of the Corporation became publicly traded, the Board of Directors of the
Corporation may not have become aware of attempted transfers, acquisitions or
ownership of common stock of the Corporation that would have caused the
Corporation to fail to qualify as a REIT. Moreover, the restrictions on
ownership and transferability contained in the Corporation's Bylaws may not be
enforceable against holders of common stock of the Corporation (which shares of
common stock were subsequently converted into Common Shares pursuant to the
Merger) who became holders prior to the time that the restrictions were added to
the Corporation's Bylaws in February 1997. If the Corporation failed to satisfy
the share ownership requirements for any of its taxable years commencing prior
to January 1, 1998, the status of the Corporation, and thus the Company as the
successor in interest to the Corporation pursuant to the Merger, as a REIT would
have terminated, and the Corporation would not have been able to prevent such
termination. See "--Failure to Qualify."
 
    QUALIFIED REIT SUBSIDIARIES.  The Company has a number of wholly owned
subsidiaries. Section 856(i) of the Code provides that a corporation that is a
"qualified REIT subsidiary" will not be treated as a separate corporation, and
all assets, liabilities and items of income, deduction and credit of a
"qualified REIT subsidiary" will be treated as assets, liabilities and items (as
the case may be) of the REIT. Thus, in applying the requirements for REIT
qualification described herein, the Company's "qualified REIT subsidiaries" will
be ignored, and all assets, liabilities and items of income, deduction and
credit of such subsidiaries will be treated as assets, liabilities and items (as
the case may be) of the Company. The Company believes that all of its wholly
owned subsidiaries are "qualified REIT subsidiaries."
 
    OWNERSHIP OF PARTNERSHIP INTERESTS.  In the case of a REIT that is a partner
in a partnership, Treasury Regulations provide that the REIT will be deemed to
own its proportionate share of the assets of the partnership and will be deemed
to be entitled to the income of the partnership attributable to such
proportionate share. In addition, the character of the assets and gross income
of the partnership retain the same character in the hands of the REIT for
purposes of Section 856 of the Code, including satisfying the gross income tests
and the asset tests. Accordingly, the Company's proportionate share of the
assets, liabilities and items of income of the Operating Partnership and any
other partnership or limited liability company in which the Company may be a
direct or indirect partner or member in the future will be treated as assets,
liabilities and items of income of the Company for purposes of applying the
requirements for REIT qualification described herein, provided that the
Operating Partnership and any other such partnerships or limited liability
companies are treated as partnerships for federal income tax purposes. See
"--Partnership Classification." The Company has direct control of the Operating
Partnership and has operated, and will continue to operate, it in a manner
consistent with the requirements for qualification as a REIT. Actions taken by
partnerships or limited liability companies in which the Company may own,
directly or indirectly, an interest in the future could affect the Company's
ability to satisfy the REIT gross income and asset tests and the determination
of whether the Company has net income from "prohibited transactions."
 
                                       18
<PAGE>
    GROSS INCOME TESTS.  To maintain its qualification as a REIT, the Company
must satisfy two gross income requirements annually. First, at least 75% of the
Company's gross income (excluding gross income from prohibited transactions) for
each taxable year must be derived directly or indirectly from investments
relating directly to real property or mortgages on real property (including
"rents from real property," which term generally includes expenses of the
Company that are paid or reimbursed by tenants, and, in certain circumstances,
interest) or from certain types of temporary investments. Second, at least 95%
of the Company's gross income (excluding gross income from prohibited
transactions) for each taxable year must be derived from such real property
investments and from (i) dividends, (ii) interest, (iii) gain from the sale or
other disposition of stock or securities, (iv) for taxable years of the Company
beginning on or after January 1, 1998, amounts received with respect to certain
hedging instruments that reduce interest rate risk associated with indebtedness
of the Company, or (v) any combination of the foregoing. For taxable years of
the Company ended on or before December 31, 1997, short-term gain from the sale
or other disposition of stock or securities, gain from prohibited transactions,
and gain from the sale or other disposition of real property held for less than
four years (apart from involuntary conversions and sales of foreclosure
property) must have represented less than 30% of the Company's gross income
(including gross income from prohibited transactions) for each such taxable
year. The 1997 Act eliminated this 30% test for the Company's taxable years
beginning on or after January 1, 1998.
 
    For purposes of satisfying the 75% and 95% gross income tests described
above, rents received by the Company from a tenant will qualify as "rents from
real property" only if several conditions are met. First, the amount of rent
must not be based in whole or in part on the income or profits derived by any
person from such property. However, an amount received or accrued generally will
not be excluded from the term "rents from real property" solely by reason of
being based on a fixed percentage or percentages of receipts or sales. Second,
the Code provides that rents received from a tenant will not qualify as "rents
from real property" in satisfying the gross income tests if the Company, or an
actual or constructive owner of 10% or more of the Company, actually or
constructively owns a 10% or greater interest in such tenant (a "Related Party
Tenant"). Third, if rent attributable to personal property leased in connection
with a lease of real property is greater than 15% of the total rent received
under the lease, then the portion of rent attributable to such personal property
will not qualify as "rents from real property." Finally, for rents received to
qualify as "rents from real property," the Company generally must not operate or
manage the property or furnish or render services to the tenants of such
property (subject to a 1% de minimis exception described below), other than
through an independent contractor that is adequately compensated and from whom
the REIT derives no revenue. The Company may, however, directly perform certain
services that are "usually or customarily rendered" in connection with the
rental of space for occupancy only and are not otherwise considered "rendered to
the occupant" of the property.
 
    As a result of changes made by the 1997 Act, if, for taxable years of the
Company beginning on or after January 1, 1998, the Company provides services to
a tenant, or otherwise in relation to the management of the property, that are
not usually or customarily provided in connection with the rental of space for
occupancy only ("impermissible tenant services"), amounts received or accrued by
the Company for any such services will not be treated as "rents from real
property" for purposes of the REIT gross income tests. However, the provision of
such impermissible tenant services will not cause other amounts received with
respect to the same property to fail to be treated as "rents from real property"
unless the amounts received or accrued in respect of the impermissible tenant
services for any taxable year exceed 1% of all amounts received or accrued,
directly or indirectly, by the Company during such taxable year with respect to
that property. Under the literal wording of Section 856 of the Code, if the 1%
threshold is exceeded, no amount received or accrued by the Company with respect
to the property will qualify as "rents from real property," even if the
impermissible tenant services are provided to some, but not all, of the tenants
of the property. For purposes of applying this de minimis rule, the amount that
the Company will be treated as having received or accrued for providing
impermissible tenant services may not be less than 150% of the Company's direct
cost of providing the services.
 
    The Company has represented that it has not and will not in the future (i)
charge rent for any property that is based in whole or in part on the income or
profits of any person (except by reason of being based on a percentage of
receipts or sales, as described above), (ii) rent any property to a Related
Party Tenant (unless the
 
                                       19
<PAGE>
Board of Trustees determines in its discretion that the rent received from such
Related Party Tenant is not material and will not jeopardize the Company's
status as a REIT), or (iii) derive rental income attributable to personal
property (other than personal property leased in connection with the lease of
real property, the amount of which is less than 15% of the total rent received
under the lease).
 
    As noted above, the Declaration of Trust provides for restrictions on the
ownership and transfer of the Company's shares of beneficial interest that are
intended, in part, to assist the Company in satisfying the 75% and 95% gross
income tests described above by prohibiting owners of equity interests in a
Related Party Tenant from owning shares of beneficial interest of the Company if
such share ownership would jeopardize the Company's status as a REIT. Prior to
the amendment and restatement of the Corporation's Charter in September 1997,
the provisions of the Charter restricting ownership and transfer of the
Corporation's stock, however, did not operate automatically to prohibit the
ownership of shares of the Corporation's stock that would result in the
disqualification of the Corporation as a REIT, but instead required the Board of
Directors to take action to prohibit or deem to be null and void any such
ownership of shares of stock or to purchase or redeem any such shares. Although
the Company believes that it has not in the past and does not currently rent any
property to a Related Party Tenant, there can be no assurance that, prior to its
taxable year commencing on January 1, 1998, the Corporation's Board of Directors
would have become aware of ownership of stock by persons whose ownership of
interests in Related Party Tenants could have jeopardized the status of the
Corporation, and thus the Company as the successor in interest to the
Corporation pursuant to the Merger, as a REIT. Moreover, the restrictions on
ownership and transfer contained in the Corporation's Bylaws were adopted in
1997 and may not be enforceable against holders of common stock of the
Corporation (which shares of common stock were subsequently converted into
Common Shares pursuant to the Merger) who acquired such shares prior to the
adoption of these provisions of the Corporation's Bylaws.
 
    The Company has performed and will in the future perform certain services
with respect to the Properties for certain of its tenants. The Company believes
that the services it provides to tenants are usually and customarily rendered in
the geographic market of the Properties in connection with the rental of space
for occupancy only, and, accordingly, that the provision of such services has
not caused, and will not in the future cause, the rents received with respect to
the Properties to fail to qualify as "rents from real property" for purposes of
the 75% and 95% gross income tests described above. In the case of any services
provided to tenants that are not "usual and customary," the Company has
represented that either it has employed and intends to continue to employ
qualifying independent contractors to provide such services or that, in taxable
years beginning on and after January 1, 1998, the amounts received from the
provision of such services fall within the 1% de minimis rule described above.
 
    The Company has received and will in the future receive fees for services,
or payments in the form of reimbursements for expenses incurred in the
performance of services, in either case provided to the Operating Partnership.
Although the law is not entirely clear, because the Company has a significant
capital interest directly and indirectly in the Operating Partnership, the
amount of such fees and reimbursements that is apportioned to the capital
interest of the Company in the Operating Partnership should not be treated as a
separate item of income and should be disregarded for purposes of the 75% and
95% gross income tests. The amount of such fees and reimbursements, on the other
hand, that is apportioned to the capital interests of other partners in the
Operating Partnership will generally result in non-qualifying income to the
Company under the 75% and 95% gross income tests. In addition, the Company has
received and will continue in the future to receive a de minimis amount of
management fees in exchange for the performance of certain services with respect
to properties that are owned entirely by third parties. All such third-party
management fees will constitute non-qualifying income for purposes of the 75%
and 95% gross income tests.
 
    The Company believes that the aggregate amount of non-qualifying income
(including such fees and reimbursements) in any taxable year has not exceeded
and will not in any future taxable year exceed the limits on non-qualifying
income under the 75% or 95% gross income tests. The Company intends to carefully
monitor its compliance with the 75% and 95% gross income tests. Should the
potential amount of non-qualifying income of
 
                                       20
<PAGE>
the Company in the future create a risk as to the qualification of the Company
as a REIT, the Company intends to take action to avoid non-qualification as a
REIT.
 
    The Company believes that it has satisfied the three gross income tests then
in effect for each of its taxable years during the period commencing with its
taxable year ended December 31, 1993 and ending with its taxable year ended
December 31, 1997. The Company intends to operate in a manner that will enable
it to continue to satisfy, consistent with the 1997 Act, the 75% and the 95%
gross income tests in the future.
 
    If the Company fails to satisfy one or both of the 75% or the 95% gross
income tests for any taxable year, it may nevertheless qualify as a REIT for
such year if it is entitled to relief under certain provisions of the Code.
These relief provisions will generally be available if (i) the Company's failure
to meet such test(s) was due to reasonable cause and not willful neglect, (ii)
the Company attaches a schedule of the sources of its income to its federal
income tax return for such taxable year, and (iii) any incorrect information on
the schedule was not due to fraud with intent to evade tax. It is not possible,
however, to state whether, in all circumstances, the Company would be entitled
to the benefit of these relief provisions. For example, if the Company failed to
satisfy the gross income tests because non-qualifying income that the Company
intentionally earned exceeded the limits on such income, the IRS could conclude
that the Company's failure to satisfy the tests was not due to reasonable cause.
If these relief provisions were inapplicable to a particular set of
circumstances involving the Company, the Company would cease to qualify as a
REIT. As discussed above in "--Taxation of the Company," even if these relief
provisions applied, a 100% tax would still be imposed on the greater of the
amount by which the Company failed the 75% or the 95% test, multiplied by a
fraction intended to reflect the Company's profitability. No similar mitigation
provision would apply to provide relief if the Corporation failed to satisfy the
30% income test for a taxable year ended on or before December 31, 1997, and in
such case, the Corporation, and thus the Company as the successor in interest to
the Corporation pursuant to the Merger, would have ceased to qualify as a REIT.
See "--Failure to Qualify."
 
    ASSET TESTS.  The Company, at the close of each quarter of its taxable year,
must also satisfy three tests relating to the nature of its assets. First, at
least 75% of the value of the Company's total assets must be represented by real
estate assets (including (i) its allocable share of real estate assets held by
partnerships (or limited liability companies taxable as partnerships for federal
income tax purposes) in which the Company or one of its qualified REIT
subsidiaries owns an interest, and (ii) stock or debt instruments purchased with
the proceeds of a share offering or long-term (at least five years) debt
offering of the Company and held for not more than one year following the
receipt by the Company of such proceeds), cash, cash items and government
securities. Second, not more than 25% of the Company's total assets may be
represented by securities other than those in the 75% asset class. Third, of the
investments included in the 25% asset class, the value of any one issuer's
securities owned by the Company may not exceed 5% of the value of the Company's
total assets and the Company may not own more than 10% of any one issuer's
outstanding voting securities (except for interests in the Operating
Partnership, any other partnership (or limited liability company taxable as a
partnership for federal income tax purposes) in which the Company may or may be
deemed to be a direct or indirect partner (or member) in the future, and any
qualified REIT subsidiary of the Company).
 
    For purposes of the three asset tests, the Company will be deemed to own its
proportionate share of the assets of the Operating Partnership and any other
partnership (or limited liability company taxable as a partnership for federal
income tax purposes) in which the Company may or may be deemed to be a direct or
indirect partner (or member) in the future and 100% of the assets of each of its
qualified REIT subsidiaries. The Company's actual ownership interests in those
entities will be disregarded.
 
    After initially meeting the asset tests at the close of any quarter, the
Company will not lose its status as a REIT for failing to satisfy the asset
tests at the end of a later quarter solely by reason of changes in asset values.
If the failure to satisfy the asset tests results from an acquisition of
securities or other property during a quarter (including as a result of the
Company increasing its interest in the Operating Partnership), the failure can
be cured by disposition of sufficient non-qualifying assets within 30 days after
the close of that quarter. The Company believes that it has satisfied the
requirements of the three asset tests described above for all relevant
 
                                       21
<PAGE>
periods commencing with its taxable year ended December 31, 1993. The Company
has further represented that it has maintained and intends to continue to
maintain adequate records of the value of its assets to ensure compliance with
the asset tests and to take such other actions within 30 days after the close of
any quarter as may be required to cure any noncompliance. If the Company fails
to cure noncompliance with the asset tests within such time period, the Company
would cease to qualify as a REIT.
 
    ANNUAL DISTRIBUTION REQUIREMENTS.  To maintain its qualification as a REIT
the Company is required to distribute dividends (other than capital gain
dividends) qualifying for the dividends paid deduction (as defined in Section
561 of the Code) to its shareholders each year in an amount at least equal to
(i) the sum of (A) 95% of the Company's "REIT taxable income" (computed without
regard to the dividends paid deduction and the Company's net capital gain) plus
(B) 95% of the net income (after tax), if any, from foreclosure property, minus
(ii) the sum of certain items of non-cash income. In addition, if the Company
disposes of any asset during its Recognition Period, the Company will be
required to distribute at least 95% of the Built-in Gain (after tax), if any,
recognized on the disposition of such asset. Such distributions must be paid in
the taxable year to which they relate, or in the following taxable year if
declared before the Company timely files its federal income tax return for such
year and if paid on or before the first regular dividend payment after such
declaration.
 
    To the extent that the Company does not distribute all of its net capital
gain or distributes at least 95%, but less than 100%, of its "REIT taxable
income," as adjusted, it will be subject to tax on the undistributed amounts at
regular ordinary or capital gains corporate tax rates, as the case may be.
Furthermore, if the Company should fail to distribute during each calendar year
at least the sum of (i) 85% of its REIT ordinary income for such year, (ii) 95%
of its REIT capital gain net income for such year, plus (iii) any undistributed
taxable income from prior years, the Company will be subject to a 4% excise tax
on the excess of such required distribution over the amounts actually
distributed.
 
    The Company believes that it has made timely distributions sufficient to
satisfy all of the annual distribution requirements for each of its taxable
years commencing with its taxable year ended December 31, 1993. Prior to January
1, 1996, however, the Corporation maintained a dividend reinvestment and share
purchase plan pursuant to which shares of common stock of the Corporation were
issued to certain of the then existing shareholders of the Corporation. The IRS
may challenge certain operational aspects of the plan, and, if successful, such
a challenge would result in the Company, as the successor in interest to the
Corporation pursuant to the Merger, having to pay "deficiency dividends" (as
further discussed below) to its shareholders, as well as interest to the IRS, to
maintain the Company's status as a REIT. While the amount of such "deficiency
dividends" and interest could be significant, the Company anticipates that it
would be able to obtain funds to pay these amounts from borrowings or other
sources. For purposes of its opinion regarding the Company's qualification as a
REIT, Jones, Day, Reavis & Pogue, special counsel to the Company, has assumed
that in the event of a successful challenge by the IRS, the Company would have
sufficient funds to pay and would use such funds to pay the amount of such
"deficiency dividends" and interest in a timely manner.
 
    The Company intends to continue to make timely distributions sufficient to
satisfy all of the annual distribution requirements for its current and future
taxable years. In this regard, the Amended and Restated Agreement of Limited
Partnership of the Operating Partnership, as amended through the date of the
Registration Statement (the "Partnership Agreement") requires the Company, as
general partner, to use its best efforts to cause the Operating Partnership to
distribute to its partners an amount sufficient to permit the Company to meet
these distribution requirements. It is expected that the Company's REIT taxable
income will be less than its cash flow due to the allowance of depreciation and
other non-cash charges in computing REIT taxable income. Accordingly, the
Company anticipates that it will generally have sufficient cash or liquid assets
to enable it to satisfy the distribution requirements described above. It is
possible, however, that the Company, from time to time, may not have sufficient
cash or other liquid assets to meet the 95% distribution requirement due to the
insufficiency of cash flow from the Operating Partnership in a particular year
or to timing differences between the actual receipt of income and actual payment
of deductible expenses, on the one hand, and the inclusion of such income and
deduction of such expenses in computing the Company's REIT taxable income, on
the other hand. In the event that such an insufficiency or such timing
differences occur, in order to meet the 95%
 
                                       22
<PAGE>
distribution requirement, the Company may find it necessary to cause the
Operating Partnership to arrange for short-term, or possibly long-term,
borrowings or to pay dividends in the form of taxable dividends of shares of
beneficial interest.
 
    Under certain circumstances, the Company may be able to rectify a failure to
meet the distribution requirement for a year by paying "deficiency dividends" to
its shareholders in a later year, which may be included in the Company's
deduction for dividends paid for the earlier year. Thus, the Company may be able
to avoid being taxed on amounts distributed as deficiency dividends; however,
the Company will be required to pay interest to the IRS based upon the amount of
any deduction taken for deficiency dividends.
 
    RECORD KEEPING REQUIREMENTS.  Pursuant to applicable Treasury Regulations,
the Company must maintain certain records and request on an annual basis certain
information from its shareholders of record designed to disclose the actual
owners of its outstanding shares of beneficial interest. For taxable years of
the Company beginning on or after January 1, 1998, if the Company were to fail
to comply with these record keeping requirements, it would be subject to a
$25,000 penalty ($50,000 in the case of an intentional violation) for each year
of non-compliance, subject to an exception if the Company were able to
demonstrate that its failure to comply was due to reasonable cause and not
willful neglect. For taxable years ended on or before December 31, 1997,
noncompliance would have resulted in the failure of the Corporation, and thus
the Company as the successor in interest to the Corporation pursuant to the
Merger, to qualify as a REIT. See "--Requirements for
Qualification--Organizational Requirements." The Company has represented that it
has complied with these record keeping requirements and intends to continue to
comply with such requirements in the future.
 
    PARTNERSHIP ANTI-ABUSE RULES.  Treasury Regulations have been promulgated
under the partnership provisions of the Code that permit the IRS to
recharacterize transactions involving partnerships that purport to create tax
advantages that are inconsistent with the intent of the partnership provisions
of the Code. The scope and intended application of these Treasury Regulations
are unclear. Nonetheless, although the matter is not free from doubt, Jones,
Day, Reavis & Pogue believes that these Treasury Regulations do not adversely
affect the Company's ability to qualify as a REIT.
 
    PENALTY TAX ON PROHIBITED TRANSACTIONS.  Any gain realized by the Company on
the sale of any property held as inventory or other property held primarily for
sale to customers in the ordinary course of business (including the Company's
share of any such gain realized by the Operating Partnership) will be treated as
income from a prohibited transaction that is subject to a 100% penalty tax. Such
prohibited transaction income may also have an adverse effect upon the Company's
ability to satisfy the income tests for qualification as a REIT for taxable
years of the Company commencing prior to January 1, 1998. Under existing law,
whether property is held as inventory or primarily for sale to customers in the
ordinary course of a trade or business is a question of fact that depends on all
the facts and circumstances with respect to the particular transaction. The
Operating Partnership intends to hold the Properties for investment with a view
to long-term appreciation, to engage in the business of acquiring, developing,
owning, and operating the Properties (and other properties) and to make such
occasional sales of the Properties as are consistent with such investment
objectives. Based upon such investment objectives, the Company believes that in
general the Properties should not be considered inventory or other property held
primarily for sale to customers in the ordinary course of a trade or business
and that the amount of income from prohibited transactions, if any, will not be
material. There can be no assurance, however, that the IRS might not contend
that one or more of such sales is subject to the 100% penalty tax. See
"--Taxation of the Company."
 
FAILURE TO QUALIFY
 
    If the Company fails to qualify for taxation as a REIT in any taxable year
and the relief provisions do not apply, the Company will be subject to tax
(including any applicable alternative minimum tax) on its taxable income at
regular corporate rates. Distributions to shareholders in any year in which the
Company fails to qualify as a REIT will not be required to be made and, if made,
will not be deductible by the Company. As a result, the Company's failure to
qualify as a REIT will reduce the cash available for distribution by the Company
 
                                       23
<PAGE>
to its shareholders. In addition, if the Company fails to qualify as a REIT, all
distributions to the Company's shareholders will be taxable as ordinary income
dividends to the extent of the Company's then current and accumulated earnings
and profits, and, subject to certain limitations in the Code, corporate
distributees may be eligible for the dividends-received deduction. Unless
entitled to relief under specific statutory provisions, the Company also will be
ineligible for qualification as a REIT for the four taxable years following the
year during which such qualification was lost. It is not possible to determine
whether the Company would be entitled to such statutory relief in all
circumstances.
 
TAXATION OF TAXABLE U.S. SHAREHOLDERS
 
    As used herein, the term "U.S. Shareholder" means a holder of Common Shares
or Preferred Shares (collectively, the "Shares") who (for U.S. federal income
tax purposes) is (i) a citizen or resident alien individual of the United
States, (ii) a corporation created or organized in or under the laws of the
United States or of any State thereof, (iii) an estate the income of which is
subject to U.S. federal income tax regardless of its source, or (iv) a trust if
a court within the United States is able to exercise primary supervision over
the trust's administration and one or more United States persons have the
authority to control all of the trust's substantial decisions.
 
    DISTRIBUTIONS GENERALLY.  As long as the Company qualifies as a REIT,
distributions made by the Company out of its current or accumulated earnings and
profits (and not designated as capital gain dividends) will constitute dividends
taxable to its taxable U.S. Shareholders as ordinary income. Such dividends will
not be eligible for the dividends-received deduction in the case of U.S.
Shareholders that are corporations.
 
    Distributions made by the Company that are properly designated by the
Company as capital gain dividends will be taxable to taxable U.S. Shareholders
as long-term capital gains (to the extent that they do not exceed the Company's
actual net capital gain for the taxable year) without regard to the period for
which a U.S. Shareholder has held such holder's Shares. United States
Shareholders that are corporations will not be eligible for the dividends
received deduction with respect to such dividends and, further, may be required
to treat up to 20% of certain capital gain dividends as ordinary income.
 
    The 1997 Act and the 1998 Act made significant changes to the taxation of
capital gains recognized by individuals, trusts and estates. Following passage
of the 1997 Act, the IRS, in November 1997, issued Notice 97-64, which provides
generally that the Company may classify portions of its designated capital gain
dividends for taxable years ending on or after May 7, 1997, as (i) a 20% rate
gain distribution (taxable as long-term capital gain in the 20% group), (ii) an
unrecaptured Section 1250 gain distribution (taxable as long-term capital gain
in the 25% group), or (iii) a 28% rate gain distribution (taxable as long-term
capital gain in the 28% group). The 1998 Act in effect eliminated the 28%
maximum long-term capital gains tax rate applicable to gains from the sale or
exchange of capital assets held by individuals, trust and estates for more than
one year but not more than 18 months, effective for taxable years ending after
December 31, 1997. Accordingly, the Company will presumably be able to classify
portions of its designated capital gain dividends for taxable years ending after
December 31, 1997, as either (i) a 20% rate gain distribution, or (ii) an
unrecaptured Section 1250 gain distribution. For a discussion of the long-term
capital gain tax rates applicable to individuals, estates and trusts, see
"--Taxation of Taxable U.S. Shareholders--1997 Act and 1998 Act Changes to
Capital Gains Tax Rates."
 
    To the extent that the Company makes distributions (not designated as
capital gain dividends) in excess of its current and accumulated earnings and
profits, such distributions will be treated first as a tax-free return of
capital to each U.S. Shareholder, reducing the adjusted tax basis that such U.S.
Shareholder has in such holder's Shares by the amount of such distribution (but
not below zero), with distributions in excess of a U.S. Shareholder's adjusted
tax basis in such holder's Shares taxable as capital gains. For purposes of
determining the portion of distributions made with respect to separate classes
of shares of beneficial interest that will be treated as dividends for federal
income tax purposes, current and accumulated earnings and profits of the Company
will be allocated first to distributions resulting from priority rights of
Preferred Shares before being allocated to other distributions. Dividends
declared by the Company in October, November, or December of any year and
payable to a shareholder of record on a specified date in any such month shall
be treated as both paid by the
 
                                       24
<PAGE>
Company and received by the shareholder on December 31 of such year, provided
that the dividend is actually paid by the Company on or before January 31 of the
following calendar year. United States Shareholders may not include in their own
income tax returns any net operating losses or capital losses of the Company.
 
    The Company will be treated as having sufficient earnings and profits to
treat as dividends all distributions made by the Company during a calendar year
that are not in excess of the amount required to be distributed by the Company
for such year in order to avoid the imposition of the 4% excise tax discussed
above. See "--Requirements for Qualification--Annual Distribution Requirements."
Moreover, any "deficiency dividends" paid by the Company will be treated as
dividends (either ordinary or capital gain dividends, as the case may be) for
tax purposes, without regard to the amount of the Company's current and
accumulated earnings and profits. As a result, U.S. Shareholders may be required
to treat as taxable dividends certain distributions made by the Company that
would otherwise result in a tax-free return of capital.
 
    Distributions received from the Company and gain arising from the sale or
other disposition by a U.S. Shareholder of Shares will not be treated as passive
activity income, and, as a result, U.S. Shareholders generally will not be able
to apply any "passive losses" against such income or gain. Distributions
received from the Company (to the extent they do not constitute a return of
capital) generally will be treated as investment income for purposes of
computing the investment interest deduction limitation.
 
    UNDISTRIBUTED NET CAPITAL GAINS.  As a result of changes made by the 1997
Act, for the Company's taxable years beginning on or after January 1, 1998, the
Company will have greater flexibility to retain, rather than distribute as
capital gain dividends, its net long-term capital gains, although the Company
will still be required to pay tax on such retained amounts. See "--Requirements
for Qualification--Annual Distribution Requirements." If the Company so elects
to retain its net long-term capital gains, U.S. Shareholders holding Shares as
of the close of the Company's taxable year will be required to include in their
income as long-term capital gains their proportionate share of such amount of
the undistributed net long-term capital gains as the Company may designate in a
written notice mailed to its shareholders within 60 days after the close of its
taxable year. The Company may not designate an amount in excess of the Company's
undistributed net capital gain for the year. Each U.S. Shareholder required to
include in income such holder's proportionate share of such designated
undistributed net capital gains would be deemed to have paid, in the taxable
year of the inclusion, the tax paid by the Company in respect of such
proportionate share of the designated amount, and would be allowed a credit or a
refund, as the case may be, for the tax deemed to have been paid by such holder.
Each such U.S. Shareholder would also be entitled to increase such holder's
adjusted tax basis in such holder's Shares by the excess of the amount of such
includible gains over the amount of the tax deemed paid by such holder in
respect of such gains. The earnings and profits of the Company, as well as the
earnings and profits of any U.S. Shareholder that is a corporation, would be
appropriately adjusted to take account of the retained capital gains in
accordance with Treasury Regulations to be prescribed by the IRS.
 
    SALE OR OTHER DISPOSITION OF SHARES.  Upon any sale or other disposition of
Shares, a U.S. Shareholder will recognize gain or loss for federal income tax
purposes in an amount equal to the difference between (i) the amount of cash and
the fair market value of any property received on such sale or other
disposition, and (ii) the holder's adjusted tax basis in such Shares. For sales
or other dispositions occurring in taxable years ending after December 31, 1997,
such gain or loss in the case of an individual, trust or estate will be
long-term capital gain or loss if the Shares have been held for more than one
year. Gain or loss in the case of a corporation will be long-term gain or loss
if the Shares have been held for more than one year. In general, any loss
recognized by a U.S. Shareholder upon the sale or other disposition of Shares
that have been held for six months or less (after applying certain holding
period rules) will be treated as a long-term capital loss to the extent of
distributions received by such U.S. Shareholder from the Company that were
required to be treated as long-term capital gains. In the case of a U.S.
Shareholder that is an individual, trust or estate, the long-term capital loss
will be apportioned among the applicable long-term capital gain groups to the
extent that distributions received by such U.S. Shareholder were previously so
treated.
 
                                       25
<PAGE>
    1997 ACT AND 1998 ACT CHANGES TO CAPITAL GAINS TAX RATES.  As previously
noted, the 1997 Act and 1998 Act made significant changes to the taxation of
capital gains recognized by individuals, trusts and estates. For taxable years
ending after December 31, 1997, the maximum rate of tax on long-term capital
gains (i.e., gains from the sale or exchange of capital assets held for more
than one year) of individuals, trusts and estates is 20%, except in the case of
"unrecaptured Section 1250 gain" (i.e., gain attributable to the depreciation of
Section 1250 property) of individuals, trusts and estates, which is subject to a
maximum rate of tax of 25%. Even lower rates apply for taxpayers in the 15%
marginal federal income tax bracket. The 1997 Act also provided special rules
for "qualified 5-year gain," and made certain other changes to prior law.
Neither the 1998 Act nor the 1997 Act changed the taxation of capital gains
recognized by corporations.
 
    Both the 1997 Act and the 1998 Act authorize the IRS to prescribe such
regulations as may be appropriate to apply the new capital gains tax rates to
sales or exchanges of capital assets by "pass-thru" entities, such as a REIT and
to sales or exchanges of interests in such entities, but no such regulations
have been promulgated to date. For a discussion of how the new capital gains
rules are to apply to the taxation of distributions by the Company to its U.S.
Shareholders designated as capital gain dividends, see "Taxation of Taxable
United States Shareholders--Distributions Generally" above. U.S. Shareholders
are urged to consult with their own tax advisors with respect to the new capital
gains rules in the 1997 Act and the 1998 Act.
 
    BACKUP WITHHOLDING AND INFORMATION REPORTING.  The Company will report to
its U.S. Shareholders and the IRS the amount of dividends paid during each
calendar year, and the amount of tax withheld on such dividends, if any. Under
the federal income tax backup withholding rules, a U.S. Shareholder may be
subject to backup withholding at the rate of 31% with respect to dividends paid
unless such holder (a) is a corporation or comes within certain other exempt
categories and, when required, is able to demonstrate this fact to the Company,
or (b) provides a taxpayer identification number, certifies that such holder is
not subject to backup withholding, and otherwise complies with the applicable
requirements of the backup withholding rules. A U.S. Shareholder that does not
provide the Company with such holder's correct taxpayer identification number
may also be subject to penalties imposed by the IRS. Any amount paid as backup
withholding will be creditable against the U.S. Shareholder's federal income tax
liability. In addition, the Company may be required to withhold a portion of
capital gain dividends paid to any shareholders who fail to certify their
non-foreign status to the Company. See "--Taxation of Non-U.S.
Shareholders--Backup Withholding and Information Reporting."
 
TAXATION OF TAX-EXEMPT SHAREHOLDERS
 
    The IRS has issued a published revenue ruling in which it held that amounts
distributed by a REIT to a tax-exempt employees' pension trust do not constitute
unrelated business taxable income ("UBTI"). Based on that ruling and the
analysis contained therein, distributions made by the Company to, as well as
gain from the sale or other disposition of Shares by, a U.S. Shareholder that is
a tax-exempt entity (such as an individual retirement account (an "IRA") or a
401(k) plan, but excluding certain types of tax-exempt entities dealt with
below) should not constitute UBTI unless such tax-exempt U.S. Shareholder has
financed the acquisition of its Shares with "acquisition indebtedness" and the
Shares are thus treated as "debt-financed property" within the meaning of
Section 514 of the Code, or such Shares are used in an unrelated trade or
business conducted by such tax-exempt shareholder.
 
    Special rules apply to tax-exempt U.S. Shareholders that are social clubs,
voluntary employee benefit associations, supplemental unemployment benefit
trusts, and qualified group legal services plans exempt from federal income
taxation under Sections 501(c)(7), (c)(9), (c)(17) and (c)(20), respectively, of
the Code. In the case of these tax-exempt U.S. Shareholders, distributions made
by the Company and gain from the sale or other disposition of Shares will
generally constitute UBTI unless the tax-exempt shareholder is able properly to
deduct amounts set aside or placed in reserve for certain purposes so as to
offset the income and gain generated by its investment in Shares. Such
prospective tax-exempt investors should consult their own tax advisors
concerning these "set aside" and reserve requirements.
 
                                       26
<PAGE>
    Special rules also apply to certain tax-exempt pension trusts (including
401(k) plans but excluding IRAs or government pension plans) that own more than
10% (by value) of the ownership interests in a "pension-held REIT" at any time
during a taxable year. Such a pension trust must treat a certain percentage of
all dividends received from the REIT (or deemed received) during the year as
UBTI. The percentage is equal to the ratio of the REIT's gross income (less
direct expenses related thereto) derived from the conduct of unrelated trades or
businesses determined as if the REIT were itself a tax-exempt pension trust, to
the REIT's gross income (less direct expenses related thereto) from all sources.
The special rules will not apply to require a pension trust to recharacterize a
portion of its distributions received from the REIT as UBTI unless the
percentage computed is at least 5%.
 
    A REIT will be treated as a "pension-held REIT" only if the REIT is
predominantly held by tax-exempt pension trusts and if the REIT would otherwise
fail to satisfy the "five or fewer" share ownership requirement discussed above,
see "--Requirements for Qualification--Organizational Requirements," if the
stock or shares of beneficial interest of the REIT held by such tax-exempt
pension trusts were not treated (under Section 856(h)(3) of the Code) as being
held directly by their respective beneficiaries (instead of by the trusts
themselves). A REIT is predominantly held by tax-exempt pension trusts if at
least one tax-exempt pension trust holds more than 25% (by value) of the
interests in the REIT or if one or more tax-exempt pension trusts (each of which
owns more than 10% (by value) of the interests in the REIT) own in the aggregate
more than 50% (by value) of the interests in the REIT. The provisions requiring
tax-exempt pension trusts to treat a portion of distributions received from a
REIT as UBTI will not apply to the Company if it is able to satisfy the "five or
fewer" share ownership requirement without relying upon the "look-through"
exception for tax-exempt pension trusts. The Company does not expect to be
classified as a "pension-held REIT." Because, however, the Shares are publicly
traded, no assurance can be given that the Company will not in fact be
classified as a "pension-held REIT" in the future.
 
TAXATION OF NON-U.S. SHAREHOLDERS
 
    The rules governing U.S. federal income taxation of the ownership and
disposition of Shares by persons that are, for purposes of such taxation,
nonresident alien individuals, foreign corporations, foreign partnerships, or
foreign trusts or estates (collectively, "Non-U.S. Shareholders") are highly
complex, and no attempt is made herein to provide more than a brief summary of
such rules. Accordingly, the discussion does not address all aspects of U.S.
federal income tax and does not address state, local or foreign tax consequences
that may be relevant to a Non-U.S. Shareholder in light of such holder's
particular circumstances. Prospective Non-U.S. Shareholders should consult with
their own tax advisors to determine the impact of federal, state, local and
foreign income tax laws on an investment in Shares, including any reporting
requirements.
 
    In general, a Non-U.S. Shareholder will be subject to regular U.S. federal
income taxation with respect to such holder's investment in Shares in the same
manner as a U.S. Shareholder (i.e., at graduated rates on a net basis, after
allowance of deductions) if such investment is "effectively connected" with the
conduct by such Non-U.S. Shareholder of a trade or business in the United States
(or, if an income tax treaty applies, is attributable to a permanent
establishment maintained by such Non-U.S. Shareholder in the United States). A
Non-U.S. Shareholder that is a corporation and that receives income with respect
to its investment in Shares that is (or is treated as) "effectively connected"
with the conduct of a trade or business in the United States (or attributable to
a United States permanent establishment) may also be subject to the 30% branch
profits tax imposed under Section 884 of the Code, which is payable in addition
to the regular U.S. corporate income tax. The following discussion addresses
only the U.S. federal income taxation of Non-U.S. Shareholders whose investment
in Shares is not "effectively connected" with the conduct of a trade or business
in the United States (or attributable to a United States permanent
establishment). Prospective investors whose investment in Shares may be
"effectively connected" with the conduct of a United States trade or business
(or attributable to a United States permanent establishment) should consult
their own tax advisors as to the tax consequences thereof.
 
    DISTRIBUTIONS GENERALLY.  Distributions made by the Company to a Non-U.S.
Shareholder that are neither attributable to gain from the sale or exchange by
the Company of United States real property interests (as
 
                                       27
<PAGE>
discussed below) nor designated by the Company as capital gain dividends will be
treated as ordinary income dividends to the extent that they are made out of
current or accumulated earnings and profits of the Company. Generally, such
distributions will be subject to withholding of U.S. federal income tax on a
gross basis (that is, without allowance of deductions) at a 30% rate or such
reduced rate as may be specified by an applicable income tax treaty. Under
certain treaties, however, reduced withholding rates generally applicable to
dividends do not apply to dividends paid by a REIT such as the Company.
 
    Under the Treasury Regulations currently in force, dividends paid to an
address in a foreign country are generally presumed to be paid to a resident of
such country (unless the payor has actual knowledge to the contrary) for
purposes of determining the applicability of the withholding tax discussed above
and the availability of a reduced treaty rate of withholding, if any. Under
newly issued Treasury Regulations, which will become effective for payments made
after December 31, 1999, however, a Non-U.S. Shareholder who wishes to claim the
benefit of an applicable reduced treaty rate of withholding will be required to
satisfy certain certification and other requirements, including the requirement
generally to file a properly completed IRS Form W-8 with the Company, the paying
agent, or such other entity as may be required to withhold tax. The new Treasury
Regulations also provide special rules for dividends paid to (i) foreign
intermediaries, (ii) U.S. or foreign whollyowned entities that are disregarded
as entities separate from their owners for U.S. federal income tax purposes, or
(iii) flow-through entities or arrangements that are treated as fiscally
transparent for U.S. federal income tax purposes or under the laws of an
applicable income tax treaty jurisdiction or both. For example, in the case of
Shares held by a foreign partnership, the certification requirement will be
applied to the partners of the partnership, rather than the partnership itself,
although the partnership will also be required to provide certain information,
including a U.S. taxpayer identification number, and a look-through rule is
provided for tiered partnership structures. Non-U.S. Shareholders should consult
their own tax advisors regarding their ability to claim benefits under income
tax treaties with the United States.
 
    Distributions made by the Company in excess of its current and accumulated
earnings and profits will not be taxable to a Non-U.S. Shareholder to the extent
that they do not exceed the adjusted tax basis that the holder has in such
holder's Shares, but instead will reduce the adjusted tax basis of such shares
(but not below zero). To the extent that such distributions exceed the adjusted
tax basis that a Non-U.S. Shareholder has in such holder's Shares, the amount of
such excess will be treated as gain from the sale or other disposition of such
Shares, the tax treatment of which is described below.
 
    For withholding tax purposes, the Company is currently required to treat all
distributions as if made out of its current or accumulated earnings and profits
and thus intends to withhold tax at the rate of 30% (or a reduced treaty rate if
applicable) on the gross amount of any distribution (other than distributions
designated as capital gain dividends discussed below) made to a Non-U.S.
Shareholder. Under the newly issued Treasury Regulations referred to above, the
Company will not be required to withhold tax at the 30% rate on distributions
(or portions thereof) made after December 31, 1999 that it reasonably estimates
to be in excess of the Company's current and accumulated earnings and profits.
As a result, however, of a legislative change made by the Small Business Job
Protection Act of 1996, effective for distributions made after August 20, 1996,
the withholding requirements of the Foreign Investment in Real Property Tax Act
of 1980 ("FIRPTA") will apply to any distributions (or portions thereof) made by
the Company to Non-U.S. Shareholders in excess of the Company's current and
accumulated earnings and profits. Accordingly, if the Company were no longer
required to withhold tax at the 30% rate on such distributions, it would be
required to withhold tax under FIRPTA equal to 10% of the gross amount realized
by each Non-U.S. Shareholder with respect to any such distribution, including a
distribution made to a Non-U.S. Shareholder in excess of the Company's current
and accumulated earnings and profits but that did not exceed the Non-U.S.
Shareholder's adjusted tax basis in such holder's Shares and thus did not give
rise to any U.S. federal income tax. In any case, a Non-U.S. Shareholder may
seek a refund from the IRS, by filing an appropriate claim for refund, of any
amount withheld if it is subsequently determined that such distribution was, in
fact, in excess of the Company's then current and accumulated earnings and
profits and the amount withheld exceeded the Non-U.S. Shareholder's U.S. federal
income tax liability, if any, with respect to the distribution.
 
                                       28
<PAGE>
    Distributions made by the Company to a Non-U.S. Shareholder that are
designated by the Company at the time of distribution as capital gain dividends
(other than those arising from the sale or other disposition of a U.S. real
property interest) generally will not be subject to U.S. federal income taxation
unless the Non-U.S. Shareholder is a nonresident alien individual who is present
in the United States for 183 days or more during the calendar year in which such
distributions are made and either has a "tax home" (within the meaning of
Section 911(d)(3) of the Code) in the United States or maintains an office or
other fixed place of business within the United States to which such gain is
attributable, in which case the nonresident alien individual will be subject to
a 30% withholding tax on the amount of such individual's capital gains (unless
an applicable income tax treaty provides otherwise).
 
    Distributions made by the Company to a Non-U.S. Shareholder that are
attributable to gain from the sale or other disposition by the Company of U.S.
real property interests will be taxed to the Non-U.S. Shareholder under FIRPTA.
Under FIRPTA, such distributions are taxed to a Non-U.S. Shareholder as if such
distributions were gains "effectively connected" with the conduct by such holder
of a trade or business within the United States. Accordingly, a Non-U.S.
Shareholder will be taxed on such distributions at the same capital gains rates
applicable to U.S. Shareholders (subject to any applicable alternative minimum
tax and a special alternative minimum tax in the case of non-resident alien
individuals), without regard to whether such distributions are designated by the
Company as capital gain dividends. Distributions subject to FIRPTA also may be
subject to the 30% branch profits tax discussed above in the case of a corporate
Non-U. S. Shareholder that is not entitled to treaty relief or exemption.
 
    The Company will be required to withhold tax from any distribution to a
Non-U.S. Shareholder that could be designated by the Company as a capital gain
dividend in an amount equal to 35% of the gross distribution. The amount of tax
withheld is fully creditable against the Non-U.S. Shareholder's FIRPTA tax
liability, and if such amount exceeds the Non-U.S. Shareholder's U.S. federal
income tax liability for the applicable taxable year, the Non-U.S. Shareholder
may seek a refund of the excess from the IRS by filing an appropriate claim for
refund. In addition, if the Company designates as capital gain dividends
distributions previously made prior to the date of such designation and which,
at the time made, were not subject to withholding, the Company must treat as
capital gain dividends, and thus withhold 35% from, subsequent distributions
made on or after the date of such designation until the amount of such
distributions in the aggregate equals the amount of such prior distributions.
 
    UNDISTRIBUTED NET CAPITAL GAINS.  Although the law is not entirely clear, it
appears that amounts designated by the Company pursuant to the 1997 Act as
undistributed net capital gains in respect of Shares held by Non-U.S.
Shareholders (see "--Taxation of Taxable U.S. Shareholders--Undistributed Net
Capital Gains") would be treated in the same manner as actual distributions made
by the Company to such Non-U.S. Shareholders and designated as capital gain
dividends. In such case, a Non-U.S. Shareholder would be able to offset as a
credit against the U.S. federal income tax liability resulting from amounts so
designated by the Company, the Non-U.S. Shareholder's proportionate share of the
tax paid by the Company on such undistributed capital gains, and to receive from
the IRS a refund to the extent that such holder's proportionate share of such
tax exceeded the Non-U.S. Shareholder's actual U.S. federal income tax
liability.
 
    SALE OR OTHER DISPOSITION OF SHARES.  Gain recognized by a Non-U.S.
Shareholder upon the sale or other disposition of Shares generally will not be
subject to U.S. federal income taxation unless such Shares constitute "United
States real property interests" within the meaning of FIRPTA. The Shares will
not constitute "United States real property interests" so long as the Company is
a "domestically controlled REIT." A "domestically controlled REIT" is a REIT in
which at all times during a specified testing period less than 50% in value of
its stock or shares of beneficial interest is held directly or indirectly by
Non-U.S. Shareholders. The Company believes that it currently is and will
continue to be a "domestically controlled REIT," and therefore that the sale of
Shares will not be subject to taxation under FIRPTA. Because, however, the
outstanding Shares are publicly traded, no assurance can be given that the
Company will in fact continue to be a "domestically-controlled REIT" in the
future. Moreover, notwithstanding the foregoing, gain from the sale or other
disposition of Shares not otherwise subject to FIRPTA will still be taxable to a
Non-U.S. Shareholder if the Non-U.S. Shareholder is a nonresident alien
individual who is present in the United States for 183 days or more during the
calendar year in
 
                                       29
<PAGE>
which such sale or other disposition occurs and either has a "tax home" (within
the meaning of Section 911(d)(3) of the Code) in the United States or maintains
an office or other fixed place of business within the United States to which
such gain is attributable. In such case, the nonresident alien individual would
be subject to a 30% U.S. withholding tax on the amount of such individual's
capital gains (unless an applicable income tax treaty provides otherwise).
 
    If the Company does not qualify as, or ceases to be, a
"domestically-controlled REIT," gain arising from the sale or other disposition
by a Non-U.S. Shareholder of Shares would not be subject to U.S. federal income
taxation under FIRPTA as a sale of a "United States real property interest" if
(i) the Shares are "regularly traded" (as defined by applicable Treasury
Regulations) on an established securities market (e.g., the New York Stock
Exchange on which the Shares are traded) and (ii) such Non-U.S. Shareholder
owned 5% or less of the total outstanding shares of the class of beneficial
interest represented by the Shares throughout the five-year period ending on the
date of such sale or other disposition. If gain on the sale or other disposition
of Shares were subject to taxation under FIRPTA, the Non-U.S. Shareholder would
be subject to regular U.S. federal income tax with respect to such gain in the
same manner as a U.S. Shareholder (as well as to any applicable alternative
minimum tax, a special alternative minimum tax in the case of nonresident alien
individuals and the possible application of the 30% branch profits tax in the
case of foreign corporations), and the purchaser of the Shares would be required
to withhold and remit to the IRS 10% of the gross purchase price.
 
    BACKUP WITHHOLDING AND INFORMATION REPORTING.  U.S. federal income tax
backup withholding (which generally is a withholding tax imposed at the rate of
31% on certain payments to persons who fail to furnish certain tax information
under the U.S. information reporting requirements) and information reporting
generally will not apply to distributions paid to Non-U.S. Shareholders outside
the United States that are treated as (i) dividends subject to the 30% (or
reduced treaty rate) withholding tax discussed above, (ii) capital gain
dividends, or (iii) distributions attributable to gain from the sale or exchange
by the Company of United States real property interests. Under the newly issued
Treasury Regulations referred to above, certain Non-U.S. Shareholders who are
not currently subject to backup withholding on dividend payments will have to
certify as to their non-U.S. status to avoid backup withholding on dividends
paid after December 31, 1999.
 
    If a Non-U.S. Shareholder sells or otherwise disposes of Shares to or though
a U.S. office of a broker, the broker is required to file an information return
and is required to apply backup withholding at the rate of 31% unless the
Non-U.S. Shareholder has provided the broker with a certification, under
penalties of perjury, as to its non-U.S. status or has otherwise established its
entitlement to an exemption from backup withholding. If payment of the proceeds
from a sale or other disposition of Shares by a Non-U.S. Shareholder is made to
or through an office of a broker outside the United States, the broker generally
will not be required to apply backup withholding or file information returns,
except as provided below. Under the Treasury Regulations currently in effect,
information reporting (but not backup withholding) is required with respect to a
payment of proceeds from the sale or other disposition of Shares to or through a
foreign office of a broker that (a) is a United States person, (b)is a foreign
person that derives 50% or more of its gross income for certain periods from the
conduct of a trade or business within the United States, or (c) is a "controlled
foreign corporation" (generally, a foreign corporation controlled by U.S.
Shareholders) for U.S. federal income tax purposes, unless the broker has
documentary evidence in its records that the holder is a Non-U.S. Shareholder
(and the broker has no actual knowledge to the contrary) and certain other
conditions are met, or the shareholder otherwise establishes an exemption.
 
    The newly issued Treasury Regulations, which will become effective for
payments made after December 31, 1999, expand the categories of brokers that
will be required to comply with the information reporting requirements with
respect to the payment of proceeds from the sale or other disposition of Shares
effected at an office outside the United States. As a result, information
reporting may apply to certain payments of proceeds from the sale or other
disposition of Shares made after December 31, 1999 to or through foreign offices
of brokers that were previously exempt. Under the new Treasury Regulations,
however, backup withholding will not be required with respect to the payment of
proceeds from the sale or other disposition of Shares effected at a foreign
office of a broker unless the broker has actual knowledge that the payee is not
a Non-U.S. Shareholder.
 
                                       30
<PAGE>
Prospective Non-U.S. Shareholders should consult their own tax advisors
concerning these new Treasury Regulations and the effect of such Treasury
Regulations on their ownership of Shares.
 
    Backup withholding is not an additional tax. Amounts withheld under the
backup withholding rules are generally allowable as a refund or credit against a
Non-U.S. Shareholder's U.S. federal income tax liability, if any, provided that
certain required information is furnished to the IRS.
 
    ESTATE TAX.  Shares owned, or treated as owned, by an individual who is
neither a citizen nor a resident (as specially determined for purposes of the
U.S. federal estate tax) of the United States at the time of death generally
will be includible in such individual's gross estate for U.S. federal estate tax
purposes and thus will be subject to U.S. federal estate tax, subject to certain
credits, at graduated rates of up to 55%, unless an applicable estate tax treaty
provides otherwise.
 
TAX ASPECTS OF THE COMPANY'S INVESTMENT IN THE OPERATING PARTNERSHIP
 
    The Company holds direct and indirect interests in the Operating
Partnership. The following discussion summarizes certain material federal income
tax considerations applicable solely to the Company's investment in the
Operating Partnership. The discussion does not address state or local tax laws
or any federal tax laws other than income tax laws.
 
PARTNERSHIP CLASSIFICATION
 
    The Company has not requested, and does not intend to request, a ruling from
the IRS that the Operating Partnership will be classified as a partnership for
federal income tax purposes. Instead, Jones, Day, Reavis & Pogue is of the
opinion, based upon certain factual assumptions and representations made by the
Company as the general partner of the Operating Partnership, that the Operating
Partnership has been and will continue to be treated as a partnership for
federal income tax purposes and not as an association taxable as a corporation
or a publicly traded partnership. Unlike an IRS ruling, however, an opinion of
counsel is not binding on the IRS, and no assurance can be given that the IRS
will not challenge the status of the Operating Partnership as a partnership for
federal income tax purposes.
 
    If for any reason the Operating Partnership were taxable as a corporation
rather than a partnership for federal income tax purposes, the character of the
Company's assets and items of gross income would change, and, as a result, the
Company would most likely be unable to satisfy the gross income and asset tests,
which would thus prevent the Company from qualifying as a REIT. See
"--Requirements for Qualification--Gross Income Tests," "--Requirements for
Qualification--Asset Tests" and "--Failure to Qualify." In addition, any change
in the status of the Operating Partnership for federal income tax purposes might
be treated as a taxable event, in which case the Company could incur a tax
liability without any related cash distribution from the Operating Partnership.
Further, if the Operating Partnership were to be treated as an association
taxable as a corporation, items of income, gain, deduction and credit of the
Operating Partnership would not pass through to its partners, including the
Company; instead, the Operating Partnership would be taxable as a corporation,
subject to entity-level taxation on its net income at regular corporate tax
rates. The partners of the Operating Partnership would be treated for federal
income tax purposes as shareholders, with some or all of the distributions to
such partners being characterized as ordinary income dividends.
 
    The opinion of Jones, Day, Reavis & Pogue regarding the classification of
the Operating Partnership is based, in part, on Treasury Regulations issued in
final form in December 1996 governing the classification of a business entity as
a partnership or an association taxable as a corporation for federal income tax
purposes (the "Classification Regulations"). The Classification Regulations were
effective as of January 1, 1997, and replaced the former four-factor test used
to distinguish partnerships from corporations for federal income tax purposes.
In general, under the Classification Regulations, a U.S. business entity that
has at least two members and that is not organized under a state or federal
statute as a corporation, is not described under a state statute as a
joint-stock company or joint-stock association and does not meet certain other
narrow definitions set forth therein (an "eligible entity"), may elect to be
classified as either a partnership or an association taxable as a corporation.
The
 
                                       31
<PAGE>
Classification Regulations also provide for a "default" classification for such
an eligible entity that applies unless the entity files a classification
election. Under the "default" classification, such an entity will be classified
as a partnership.
 
    The classification of the Operating Partnership is governed entirely by the
Classification Regulations. Although the Operating Partnership was in existence
for state law purposes prior to January 1, 1997, it was not first treated for
federal income tax purposes as an entity separate from the Company until after
that date. Under the Classification Regulations, the Operating Partnership will
constitute an eligible entity and intends to elect to be classified as a
partnership. As an eligible entity, the Operating Partnership will be so
classified under the default classification provisions of the Classification
Regulations so long as it does not file an election to be classified as an
association taxable as a corporation. The Operating Partnership has not filed,
and does not in future intend to file, such an election.
 
    Notwithstanding the classification of a business entity formed as a
partnership under the Classification Regulations, such an entity will
nonetheless be treated as a corporation for federal income tax purposes if it is
a "publicly traded partnership." A publicly traded partnership is generally a
partnership the interests in which are either traded on an established
securities market or readily tradable on a secondary market (or the substantial
equivalent thereof). A publicly traded partnership will be treated as a
corporation for federal income tax purposes unless at least 90% of its gross
income for a taxable year consists of "qualifying income" under Section 7704(d)
of the Code, which generally includes any income that is qualifying income for
purposes of the 95% gross income test applicable to a REIT (the "90% Passive
Income Exception"). See "--Requirements for Qualification--Gross Income Tests."
 
    Treasury Regulations effective for taxable years beginning after December
31, 1995 provide limited safe harbors from the definition of a publicly traded
partnership. Pursuant to one such safe harbor (the "Private Placement
Exception"), interests in a partnership will not be treated as readily tradable
on a secondary market or the substantial equivalent thereof if (i) all interests
in the partnership were issued in a transaction (or transactions) that was not
required to be registered under the Securities Act, and (ii) the partnership
does not have more than 100 partners at any time during the partnership's
taxable year. In determining the number of partners in a partnership, a person
owning an interest in a flow-through entity (i.e., a partnership, grantor trust
or S corporation) that in turn owns an interest in a partnership will be treated
as a partner in such partnership for purposes of the 100 partner rule only if
(i) substantially all of the value of the owner's interest in the flow-through
entity is attributable to the flow-through entity's interest in the partnership,
and (ii) a principal purpose of the use of the tiered arrangement is to permit
the partnership to satisfy the 100-partner limitation. Because no interests in
the Operating Partnership have been or are currently traded on an established
securities market and because the Operating Partnership should not be treated as
having more than 100 partners, the Company believes that the Operating
Partnership presently qualifies for the Private Placement Exception. The
Operating Partnership intends to monitor closely its compliance with the Private
Placement Exception to ensure that it remains applicable. Even if, however, the
Operating Partnership were considered to be a publicly traded partnership
because it was deemed to have more than 100 partners, the Operating Partnership
would not be treated as a corporation for federal income tax purposes if it
otherwise qualified for the 90% Passive Income Exception from such treatment.
 
INCOME TAXATION OF THE OPERATING PARTNERSHIP AND ITS PARTNERS
 
    PARTNERS, NOT PARTNERSHIP, SUBJECT TO TAX.  A partnership is not a separate
taxable entity for federal income tax purposes. Rather, partners are allocated
and required to include in gross income their proportionate share of the items
of income, gain, loss, deduction and credit of the partnership, without regard
to whether the partners receive any actual distributions from the partnership.
The Company will be required to take into account its allocable share of the
foregoing items of the Operating Partnership for purposes of the various REIT
gross income tests and in the computation of its "REIT taxable income." See
"--Requirements for Qualification-- Gross Income Tests."
 
                                       32
<PAGE>
    PARTNERSHIP ALLOCATIONS.  Although a partnership agreement will generally
determine the allocation of a partnership's taxable income and loss among its
partners, such allocations will be disregarded for federal income tax purposes
under Section 704(b) of the Code if they do not comply with the provisions of
Section 704(b) and the Treasury Regulations promulgated thereunder. If an
allocation is not recognized for federal income tax purposes, the item subject
to the allocation will be reallocated in accordance with the partner's interests
in the partnership, which will be determined by taking into account all of the
facts and circumstances relating to the economic arrangement of the partners
with respect to such item. The allocations of taxable income and loss contained
in the Partnership Agreement are intended to comply with the requirements of
Section 704(b) of the Code and the Treasury Regulations promulgated thereunder.
 
    TAX ALLOCATIONS WITH RESPECT TO THE PROPERTIES.  Pursuant to Section 704(c)
of the Code, income, gain, loss, and deduction attributable to appreciated or
depreciated property that is contributed to a partnership in exchange for an
interest in the partnership must be allocated for federal income tax purposes in
a manner such that the contributing partner is charged with, or benefits from,
respectively, the unrealized gain or unrealized loss associated with the
property at the time of the contribution. The amount of such unrealized gain or
unrealized loss is generally equal to the difference between the fair market
value of the contributed property at the time of contribution and the adjusted
tax basis of such property at such time. Such allocations are solely for federal
income tax purposes and do not affect the book capital accounts or other
economic or legal arrangements among the partners. The Operating Partnership was
formed by way of contributions of appreciated property (including certain of the
Properties). Consequently the Partnership Agreement requires allocations of
income, gain, loss, and deduction attributable to such contributed properties to
be made in a manner that is consistent with Section 704(c) of the Code.
 
    In general, Section 704(c) of the Code will cause the Company and other
limited partners of the Operating Partnership contributing properties or other
assets to the Operating Partnership with fair market values in excess of their
adjusted tax bases for federal income tax purposes to be allocated solely for
tax purposes lower amounts of annual depreciation deductions and increased
taxable income and gain on the sale of those properties or other assets than
would ordinarily be the case for economic or book purposes. These allocations
may cause the Company to recognize taxable income in excess of cash proceeds,
which might adversely affect the Company's ability to comply with the REIT
distribution requirements. See "--Requirements for Qualification--Annual
Distribution Requirements."
 
    The foregoing principles may also affect the calculation of the Company's
earnings and profits for purposes of determining the portion of the Company's
distributions that is taxable as a dividend. See "--Taxation of Taxable U.S.
Shareholders." The application of these rules over time may result in a higher
portion of the Company's distributions being taxed as a dividend than would have
been the case had the Operating Partnership purchased the contributed Properties
for cash.
 
    TAX BASIS IN PARTNERSHIP INTEREST.  The Company's adjusted tax basis in its
partnership interest in the Operating Partnership generally (i) will be equal to
the amount of cash and the adjusted tax basis of any other property contributed
to the Operating Partnership by the Company, (ii) will be increased by (A) the
Company's allocable share of the Operating Partnership's taxable income and (B)
the Company's allocable share of certain indebtedness of the Operating
Partnership, and (iii) will be reduced, but not below zero, by (A) the Company's
allocable share of the Operating Partnership's losses and (B) the amount of cash
and the adjusted tax basis of any other property distributed by the Operating
Partnership to the Company, including any constructive cash distributions
resulting from a reduction in the Company's allocable share of indebtedness of
the Operating Partnership.
 
    If the Company's allocable share of the Operating Partnership's losses
exceeds the adjusted tax basis of the Company's partnership interest in the
Operating Partnership, the recognition of such excess loss for federal income
tax purposes will be deferred until such time and to the extent that the Company
has adjusted tax basis in its interest in the Operating Partnership. To the
extent that distributions made by the Operating Partnership to the Company, or
any decrease in the Company's share of the indebtedness of the Operating
Partnership (each
 
                                       33
<PAGE>
such decrease being considered a constructive cash distribution to the Company),
would exceed the Company's adjusted tax basis, such excess distributions
(including such constructive distributions) would constitute taxable income to
the Company, which normally would be characterized as a capital gain.
 
OTHER TAX CONSIDERATIONS
 
    POSSIBLE LEGISLATIVE OR OTHER ACTIONS AFFECTING TAX
CONSEQUENCES.  Prospective holders of Securities should recognize that the
present federal income tax treatment of the Company may be modified by future
legislative, judicial or administrative actions or decisions at any time, which
may or may not be retroactive in effect. As a result, any such action or
decision could affect investments and commitments previously made. The rules
dealing with federal income taxation are constantly under review by persons
involved in the legislative process and by the IRS and the Treasury Department,
resulting in frequent statutory changes as well as the promulgation of new, or
revisions to existing, Treasury Regulations and revised interpretations of
established concepts. No prediction can be made as to the likelihood of the
passage of any new tax legislation or other provisions that could either
directly or indirectly affect the Company or holders of Securities. Accordingly,
it is always possible that revisions in federal income tax laws and
interpretations thereof could adversely affect the tax consequences of an
investment in Securities.
 
    On February 2, 1998, the Treasury Department released the "General
Explanations of the Clinton Administration's Revenue Proposals for FY 1999" as
part of President Clinton's Budget Proposal for Fiscal Year 1999. Three of the
tax measures contained in the Budget Proposal would affect the taxation of
REITs. The first proposed change would limit the grandfathered status of certain
existing "stapled" or "paired-share" REITs. The second proposed change would
restrict the ability of a REIT to engage in impermissible active business
activities indirectly through a preferred stock subsidiary by prohibiting REITs
from owning more than 10%, determined by voting power or value, of the
outstanding stock of any single issuer. Under current law, the percentage
limitation is measured solely by reference to voting power, without regard to
value. The third proposed change would affect closely held REITs by providing
that no person (including a corporation) may own more than 50%, determined by
voting power or value, of the outstanding shares of stock or beneficial interest
of a REIT. The first proposed change was enacted as part of the 1998 Act, but
does not affect the Company since it is not a "stapled" REIT. The second and
third proposed changes, if enacted in the form proposed, would not have a
material adverse effect on the Company's financial condition, results of
operations or business prospects.
 
    STATE AND LOCAL TAXES.  The Company, the Operating Partnership and holders
of Securities may be subject to state or local taxation in various state or
local jurisdictions, including those in which they transact business or reside.
The state and local tax treatment of the Company, the Operating Partnership and
holders of Securities may not conform to the federal income tax consequences
discussed above. Consequently, prospective holders of Securities should consult
their own tax advisors regarding the effect of state and local tax laws on an
investment in Securities.
 
                                       34
<PAGE>
                              PLAN OF DISTRIBUTION
 
    The Company may sell the Securities in any of three ways: (i) through
underwriters or dealers; (ii) directly to a limited number of purchasers or to a
single purchaser; or (iii) through agents. The Prospectus Supplement will set
forth the terms of the offering of the Securities, including the name or names
of any underwriters, dealers or agents, the purchase price of the offered
Securities, any underwriting discounts and other items constituting
underwriters' compensation, and any discounts and commissions allowed or paid to
dealers. Any initial public offering price and any discounts or concessions
allowed or reallowed or paid to dealers may be changed from time to time.
 
    If the offered Securities are sold through underwriters, the Prospectus
Supplement relating thereto will describe the nature of the obligation of the
underwriters to take the offered Securities. The offered Securities may be
offered to the public either through underwriting syndicates represented by one
or more managing underwriters or directly by one or more underwriting firms
acting alone. The underwriter or underwriters with respect to a particular
underwritten offering of Securities will be named in the Prospectus Supplement
relating to such offering, and, if an underwriting syndicate is used, the
managing underwriter or underwriters will be set forth on the cover of such
Prospectus Supplement. Unless otherwise set forth in the Prospectus Supplement,
the obligations of the underwriters to purchase the offered Securities will be
subject to certain conditions precedent, and the underwriters will be obligated
to purchase all of the offered Securities if any are purchased.
 
    The Company may sell the Securities directly or though agents designated by
the Company from time to time. Any agent involved in the offer or sale of the
Securities in respect of which this Prospectus is delivered will be named, and
any commissions payable by the Company to such agent will be set forth, in the
Prospectus Supplement relating thereto.
 
    Underwriters and agents who participate in the distribution of the
Securities may be entitled under agreements that may be entered into by the
Company or the Operating Partnership to indemnification by the Company and the
Operating Partnership against certain liabilities, including liabilities under
the Securities Act of 1933, as amended, or to contribution with respect to
payments that the underwriters or agents may be required to make in respect
thereof.
 
    If so indicated in the Prospectus Supplement, the Company will authorize
underwriters, dealers or other persons acting as the Company's agents to solicit
offers by certain institutions to purchase Securities from the Company pursuant
to contracts providing for payment and delivery on a future date. Institutions
with which such contracts may be made include commercial and savings banks,
insurance companies, pension funds, investment companies, educational and
charitable institutions and others, but in all cases such institutions must be
approved by the Company. The obligations of any purchaser under any such
contract will not be subject to any conditions except that (i) the purchase of
the Securities shall not at the time of delivery be prohibited under the laws of
the jurisdiction to which such purchaser is subject and (ii) if the Securities
are also being sold to underwriters, the Company shall have sold to such
underwriters the Securities not sold for delayed delivery. The underwriters,
dealers and such other persons will not have any responsibility in respect of
the validity or performance of such contracts.
 
    There can be no assurance that a secondary market will be created for the
offered Securities or, if it is created, that it will continue.
 
    Certain of the underwriters and their affiliates may be customers of, engage
in transactions with and perform services for the Company in the ordinary course
of business.
 
                                       35
<PAGE>
                                 LEGAL MATTERS
 
    Certain legal matters will be passed upon for the Company by Jones, Day,
Reavis & Pogue, Chicago, Illinois, and certain matters of Maryland law,
including the validity of the Securities offered hereby, will be passed upon for
the Company by Ballard Spahr Andrews & Ingersoll, LLP, Baltimore, Maryland.
Jones, Day, Reavis & Pogue will rely on Ballard Spahr Andrews & Ingersoll, LLP
as to certain matters of Maryland law. The validity of any Securities issued
hereunder may be passed upon for any underwriters by the counsel named in the
applicable Prospectus Supplement.
 
                                    EXPERTS
 
    Ernst & Young LLP, independent auditors, have audited our consolidated
financial statements included in our Annual Report on Form 10-K for the year
ended December 31, 1997, and the statements of revenues and certain expenses of
TRI-ATRIA Office Building and 777 Eisenhower Plaza for the year ended December
31, 1996, included in our Current Report on Form 8-K/A dated February 6, 1998,
the statement of revenue and certain expenses of Star Bank Office Building and
the combined statement of revenue and certain expenses of Milwaukee Portfolio
for the year ended December 31, 1997 included in our Current Report on Form
8-K/A dated June 18, 1998, and the combined statement of revenue and certain
expenses of Inverness Properties included in our Current Report on Form 8-K/A
dated July 24, 1998, as set forth in their reports which are incorporated in
this prospectus by reference. Our consolidated financial statements and the
statements of revenues and certain expenses are incorporated by reference in
reliance on their reports given on their authority as experts in accounting and
auditing.
 
                                       36
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    YOU SHOULD RELY ONLY ON THE INFORMATION INCORPORATED BY REFERENCE OR
CONTAINED IN THIS PROSPECTUS SUPPLEMENT, THE PROSPECTUS OR ANY SUPPLEMENT
THERETO. WE HAVE NOT AUTHORIZED ANY DEALER, SALESPERSON OR OTHER PERSON TO GIVE
ANY INFORMATION OR REPRESENT ANYTHING NOT CONTAINED IN THIS PROSPECTUS
SUPPLEMENT OR THE PROSPECTUS. YOU MUST NOT RELY ON ANY UNAUTHORIZED INFORMATION.
THIS PROSPECTUS SUPPLEMENT AND THE PROSPECTUS DO NOT OFFER TO SELL OR BUY ANY
SHARES IN ANY JURISDICTION WHERE IT IS UNLAWFUL. YOU SHOULD NOT ASSUME THAT THE
INFORMATION IN THIS PROSPECTUS SUPPLEMENT, THE PROSPECTUS OR ANY SUPPLEMENT IS
ACCURATE AS OF ANY DATE OTHER THAN THE DATE ON THE FRONT PART OF THOSE
DOCUMENTS.
 
                            ------------------------
 
                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
                          PROSPECTUS SUPPLEMENT                             PAGE
                                                                            ----
<S>                                                                         <C>
Prospectus Supplement Summary.............................................   S-3
Forward-Looking Statements................................................   S-7
Use of Proceeds...........................................................   S-7
Description of the Series A Preferred Shares..............................   S-8
Certain Federal Income Tax Considerations.................................  S-12
Underwriting..............................................................  S-14
Legal Matters.............................................................  S-15
 
<CAPTION>
 
                                PROSPECTUS
<S>                                                                         <C>
About this Prospectus.....................................................     2
Where You Can Find More Information.......................................     2
The Company...............................................................     3
Risk Factors..............................................................     4
  Dependence on Market Conditions in the Midwest Region...................     4
  Risks Related to Retention of Tenants and Ability to Rent Space Upon
    Lease Expirations.....................................................     4
  Risks Associated with the Recent Acquisition of Many of the Properties;
    Lack of Operating History.............................................     4
  Real Estate Financing Risks.............................................     4
  Real Estate Investment Risks............................................     5
  Risks of Acquisition, Renovation and Development Activities.............     6
  Dependence on Key Personnel.............................................     6
  Federal Income Tax Risks--Failure to Qualify as a Real Estate Investment
    Trust.................................................................     6
  Possible Adverse Effect of REIT Distribution Requirements...............     7
  Possible Adverse Effect of Failure of Operating Partnership to Qualify
    as a Partnership for Federal Income Tax Purposes......................     7
  Possible Anti-Takeover Effects of Maryland Law and Our Declaration of
    Trust and Bylaws......................................................     8
  Possible Adverse Effect of Losses Not Covered by Insurance..............     8
  Potential Liability for Environmental Contamination.....................     8
  Possible Adverse Effect of Market Interest Rates on Prices of
    Securities............................................................     9
Use of Proceeds...........................................................    10
Ratios of Earnings to Combined Fixed Charges and Preference Dividends.....    10
Description of Shares of Beneficial Interest..............................    11
Federal Income Tax Considerations.........................................    15
Plan of Distribution......................................................    35
Legal Matters.............................................................    36
Experts...................................................................    36
</TABLE>
 
                                1,500,000 SHARES
 
                                GREAT LAKES REIT
 
                           9 3/4% SERIES A CUMULATIVE
                          REDEEMABLE PREFERRED SHARES
                             OF BENEFICIAL INTEREST
 
                         ------------------------------
 
                             PROSPECTUS SUPPLEMENT
 
                         ------------------------------
 
                           A.G. EDWARDS & SONS, INC.
                               WHEAT FIRST UNION
                            EVEREN SECURITIES, INC.
 
                               DECEMBER 16, 1998
 
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