DUKE REALTY INVESTMENTS INC
424B2, 1999-01-19
REAL ESTATE INVESTMENT TRUSTS
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<PAGE>
                                                Filed Pursuant to Rule 424(b)(2)
                                                      Registration No. 333-49911
 
PROSPECTUS SUPPLEMENT
 
(To prospectus dated April 20, 1998)
 
                                4,000,000 SHARES
 
                                     [LOGO]
 
                         DUKE REALTY INVESTMENTS, INC.
 
                               DEPOSITARY SHARES
                  EACH REPRESENTING 1/10 OF AN 8 1/4% SERIES E
                     CUMULATIVE REDEEMABLE PREFERRED SHARE
                          (PAR VALUE $0.01 PER SHARE)
       (LIQUIDATION PREFERENCE EQUIVALENT TO $25.00 PER DEPOSITARY SHARE)
                                 --------------
 
    We are a self-administered and self-managed real estate investment trust. We
are offering and selling our depositary shares, each of which represents a 1/10
interest in a Series E Preferred Share which we have deposited with American
Stock Transfer & Trust Company, as Depositary. We will receive the proceeds from
the sale of the depositary shares. As a holder of a depositary share, you will
be entitled to proportional rights and preferences as if you held 1/10 of a
Series E Preferred Share.
 
    Distributions on the Series E Preferred Shares represented by the depositary
shares will be cumulative from the date of original issue and payable quarterly,
beginning on March 31, 1999, at the rate of 8 1/4% of the liquidation preference
per annum, or $20.625 per Series E Preferred Share (equal to $2.0625 per annum
per depositary share).
 
    The Series E Preferred Shares and the depositary shares representing the
Series E Preferred Shares are not redeemable until January 20, 2004, after which
date, we may redeem such shares from the proceeds of an offering of our capital
shares, at a redemption price of $250.00 per Series E Preferred Share (equal to
$25.00 per depositary share), plus any accrued and unpaid dividends through the
date of redemption. The Series E Preferred Shares have no maturity date and will
remain outstanding indefinitely unless redeemed.
 
    We intend to file an application to list the depositary shares on the New
York Stock Exchange.
                               ------------------
 
<TABLE>
<CAPTION>
                                                           Per
                                                        Depositary
                                                          Share       Total
                                                        ---------  ------------
<S>                                                     <C>        <C>
Public Offering Price.................................     $25.00  $100,000,000
 
Underwriting Discount.................................     $.7875    $3,150,000
 
Proceeds, before expenses, to Duke Realty
  Investments, Inc....................................   $24.2125   $96,850,000
</TABLE>
 
    The underwriters may also purchase up to an additional 600,000 depositary
shares at the public offering price, less the underwriting discount, within 30
days from the date of this prospectus supplement to cover over-allotments.
 
    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 attached prospectus is truthful or complete. Any
representation to the contrary is a criminal offense.
 
    The depositary shares will be ready for delivery in New York, New York on or
about January 20, 1999.
                               ------------------
 
MERRILL LYNCH & CO.
 
          A.G. EDWARDS & SONS, INC.
 
                    MORGAN STANLEY DEAN WITTER
 
                               PAINEWEBBER INCORPORATED
<PAGE>
                                         SALOMON SMITH BARNEY
                               ------------------
 
          The date of this prospectus supplement is January 14, 1999.
<PAGE>
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
                                           PROSPECTUS SUPPLEMENT
The Company................................................................................................        S-3
Use of Proceeds............................................................................................        S-5
Ratios of Earnings to Fixed Charges........................................................................        S-5
Description of the Series E Preferred Shares and Depositary Shares.........................................        S-6
Certain Federal Income Tax Considerations..................................................................       S-11
Underwriting...............................................................................................       S-13
Legal Matters..............................................................................................       S-15
 
                                                PROSPECTUS
Available Information......................................................................................          2
Incorporation of Certain Documents by Reference............................................................          2
The Company and the Operating Partnership..................................................................          3
Use of Proceeds............................................................................................          3
Ratios of Earnings to Fixed Charges........................................................................          4
Description of Debt Securities.............................................................................          4
Description of Preferred Stock.............................................................................         14
Description of Depositary Shares...........................................................................         20
Description of Common Stock................................................................................         24
Federal Income Tax Considerations..........................................................................         26
Plan of Distribution.......................................................................................         33
Legal Opinions.............................................................................................         34
Experts....................................................................................................         34
</TABLE>
 
                            ------------------------
 
                           FORWARD-LOOKING STATEMENTS
 
    This prospectus supplement and the accompanying prospectus includes and
incorporates by reference forward-looking statements. We have based these
forward-looking statements on our current expectations and projections about
future events. These forward-looking statements are subject to risks,
uncertainties and assumptions about us, including, among other things:
 
    - Our anticipated future acquisition and development strategies;
 
    - Tax risks, including our continued qualification as a real estate
      investment trust;
 
    - The limited geographic diversification of our real estate portfolio; and
 
    - General real estate investment risks, including local market conditions
      and rental rates, competition for tenants, tenant defaults, possible
      environmental liabilities and financing risks.
 
    We undertake no obligation to publicly update or revise any forward-looking
statements, whether as a result of new information, future events or otherwise.
In light of these risks, uncertainties and assumptions, the forward-looking
events discussed in this prospectus supplement and discussed in or incorporated
by reference in the accompanying prospectus may not occur.
 
                            ------------------------
 
    You should rely only on the information contained in this prospectus
supplement and the accompanying prospectus. We have not, and the underwriters
have not, authorized any other person to provide you with different information.
If anyone provides you with different or inconsistent information, you should
not rely on it. We are not, and the underwriters are not, making an offer to
sell these securities in any jurisdiction where the offer or sale is not
permitted.
 
                                      S-2
<PAGE>
    THE FOLLOWING INFORMATION MAY NOT CONTAIN ALL THE INFORMATION THAT MAY BE
IMPORTANT TO YOU. YOU SHOULD READ THE ENTIRE PROSPECTUS SUPPLEMENT AND
ACCOMPANYING PROSPECTUS, AS WELL AS THE DOCUMENTS INCORPORATED BY REFERENCE IN
THE PROSPECTUS BEFORE MAKING AN INVESTMENT DECISION. UNLESS INDICATED OTHERWISE,
THE INFORMATION CONTAINED IN THIS PROSPECTUS SUPPLEMENT IS PRESENTED AS OF
SEPTEMBER 30, 1998. ALL REFERENCES TO "WE" OR THE "COMPANY" IN THIS PROSPECTUS
SUPPLEMENT AND THE ACCOMPANYING PROSPECTUS MEAN DUKE REALTY INVESTMENTS, INC.
AND ALL ENTITIES OWNED OR CONTROLLED BY DUKE REALTY INVESTMENTS, INC., EXCEPT
WHERE IT IS MADE CLEAR THAT THE TERM MEANS ONLY THE PARENT COMPANY.
 
                                  THE COMPANY
 
    We are a self-administered and self-managed real estate investment trust (a
"REIT") that began operations through a related entity in 1972. At September 30,
1998, we owned a diversified portfolio of:
 
    - 428 in-service industrial, office and retail properties (the
      "Properties"), encompassing approximately 49.5 million square feet located
      in eight states;
 
    - 34 buildings and four building expansions encompassing approximately 5.1
      million square feet under development; and
 
    - Approximately 1,700 acres of unencumbered land (the "Land") for future
      development, of which approximately 70% is zoned for industrial use and
      which is typically located adjacent to the Properties.
 
    We provide the following services for the Properties and for certain
properties owned by third parties:
 
    - leasing
 
    - management
 
    - construction
 
    - development
 
    - other tenant-related services
 
    We have the largest commercial real estate operations in Indianapolis and
Cincinnati and are one of the largest real estate companies in the Midwest. We
believe that the Midwest offers a relatively strong and stable economy compared
to other regions of the United States and provides significant growth potential
due to its central location, established manufacturing base, skilled work force
and moderate labor costs.
 
    We have developed over 60 million square feet of commercial property since
the Company was founded. During the last five years, we developed an average of
approximately 5.8 million square feet per year. Through the nine months ended
September 30, 1998, we placed in service 4.6 million square feet of new
development and acquired 4.2 million square feet of property. In addition to
providing services to approximately 2,800 tenants in the Properties, we provide
services to nearly 800 tenants in 88 properties owned by third parties. We
manage approximately 62 million square feet of property, including over 7.3
million square feet owned by third parties.
 
    We directly or indirectly hold all of our interests in the Properties and
Land and we conduct all of our operations through Duke Realty Limited
Partnership (the "Operating Partnership"). Holders of units in the Operating
Partnership (other than us) may exchange them for our common stock on a one for
one basis. When units are exchanged for common stock our percentage interest in
the Operating Partnership increases. We control the Operating Partnership as its
sole general partner and own, as of September 30, 1998, approximately 88% of the
Operating Partnership's units. In addition, as of September 30, 1998 our senior
management team owned approximately 14% of the Company through ownership of
common stock and units in the Operating Partnership.
 
                                      S-3
<PAGE>
    The following tables provide an overview of the Properties.
 
                             SUMMARY OF PROPERTIES
                       (IN THOUSANDS, EXCEPT PERCENTAGES)
 
<TABLE>
<CAPTION>
                                                                                           PERCENT
                                                                            ANNUAL        OF TOTAL
                                                            PERCENT          NET           ANNUAL
                                              SQUARE       OF TOTAL       EFFECTIVE     NET EFFECTIVE       OCCUPANCY AT
TYPE OF PROPERTY                               FEET       SQUARE FEET      RENT (1)         RENT         SEPTEMBER 30, 1998
- -------------------------------------------  ---------  ---------------  ------------  ---------------  ---------------------
<S>                                          <C>        <C>              <C>           <C>              <C>
Industrial.................................     34,391          69.5%     $  128,723           42.1%               94.9%
Office.....................................     12,868          26.0         155,900           51.0                96.1%
Retail.....................................      2,249           4.5          21,098            6.9                97.0%
                                             ---------           ---     ------------           ---
Total......................................     49,508           100%     $  305,721            100%               95.3%
                                             ---------           ---     ------------           ---
                                             ---------           ---     ------------           ---
</TABLE>
 
- ------------------------
 
(1) Represents annual net effective rent due from tenants in occupancy as of
    September 30, 1998. Net effective rent equals the average annual rental
    property revenue over the terms of the respective leases, excluding
    additional rent due as a result of operating expense reimbursements,
    landlord allowances for operating expenses and percentage rents.
 
           SQUARE FOOTAGE AND ANNUAL NET EFFECTIVE RENT OF PROPERTIES
                       (IN THOUSANDS, EXCEPT PERCENTAGES)
<TABLE>
<CAPTION>
                                                                       SQUARE FEET                             ANNUAL
                                               -----------------------------------------------------------      NET
                                                                                              PERCENT OF     EFFECTIVE
PRIMARY MARKET                                 INDUSTRIAL    OFFICE     RETAIL      TOTAL        TOTAL        RENT (1)
- ---------------------------------------------  -----------  ---------  ---------  ---------  -------------  ------------
<S>                                            <C>          <C>        <C>        <C>        <C>            <C>
Indianapolis.................................      15,994       1,706        179     17,879           36%    $   73,972
Cincinnati...................................       5,190       3,528      1,353     10,071           21         73,300
St. Louis....................................       1,908       2,067          -      3,975            8         37,329
Columbus.....................................       2,701       1,917        219      4,837           10         35,778
Minneapolis..................................       4,760         917     --          5,677           11         29,991
Chicago......................................         803       1,303     --          2,106            4         21,971
Cleveland....................................       1,707       1,313     --          3,020            6         21,250
Nashville....................................         634         117     --            751            2          5,357
Other (2)....................................         694      --            498      1,192            2          6,773
                                               -----------  ---------  ---------  ---------          ---    ------------
    Total....................................      34,391      12,868      2,249     49,508          100%    $  305,721
                                               -----------  ---------  ---------  ---------          ---    ------------
                                               -----------  ---------  ---------  ---------          ---    ------------
 
<CAPTION>
                                                 PERCENT OF
                                                    TOTAL
                                                   ANNUAL
                                                NET EFFECTIVE
PRIMARY MARKET                                      RENT
- ---------------------------------------------  ---------------
<S>                                            <C>
Indianapolis.................................            24%
Cincinnati...................................            24
St. Louis....................................            12
Columbus.....................................            12
Minneapolis..................................            10
Chicago......................................             7
Cleveland....................................             7
Nashville....................................             2
Other (2)....................................             2
                                                        ---
    Total....................................           100%
                                                        ---
                                                        ---
</TABLE>
 
- ------------------------
 
(1) Represents annual net effective rent due from tenants in occupancy as of
    September 30, 1998. Net effective rent equals the average annual rental
    property revenue over the terms of the respective leases, excluding
    additional rent due as a result of operating expense reimbursements,
    landlord allowances for operating expenses and percentage rents.
 
(2) Represents properties not located in our primary markets. These properties
    are located in other similar Midwestern markets.
 
    Our Properties have a diverse and stable base of approximately 2,800
tenants. Many of the tenants are Fortune 500 companies and engage in a wide
variety of businesses, including manufacturing, retailing, wholesale trade,
distribution, and professional services. Leases for approximately 3.8 million
square feet of the Properties were up for renewal in the first nine months of
1998, and we renewed leases for approximately 70% of that space. No single
tenant accounts for more than 2% of our total gross effective rent (computed
using the average annual rental property revenue over the terms of the
respective leases
 
                                      S-4
<PAGE>
including landlord operating expense allowances but excluding additional rent
due as a result of operating expense reimbursements).
 
                                USE OF PROCEEDS
 
    We expect to receive net proceeds from the sale of the depositary shares of
approximately $96.7 million, after deducting underwriting discounts, commission
and offering expenses (approximately $111.2 million if the underwriters'
over-allotment option is exercised in full). We intend to contribute or
otherwise transfer the net proceeds to the Operating Partnership in exchange for
8 1/4% Series E Cumulative Redeemable Preferred Units (the "Series E Preferred
Units") in the Operating Partnership, the economic terms of which will be
substantially identical to the 8 1/4% Series E Cumulative Redeemable Preferred
Shares (the "Series E Preferred Shares"). The Operating Partnership will be
required to make all required distributions on the Series E Preferred Units
(which will mirror the payments of distributions, including accrued and unpaid
distributions upon redemption, of the liquidation preference amount on the
Series E Preferred Shares) prior to any distribution of cash or assets to the
holders of the Operating Partnership's non-preferred units. See "Description of
the Series E Preferred Shares and Depositary Shares -- Distributions." The
Operating Partnership presently intends to use the net proceeds to reduce the
outstanding balance on our unsecured line of credit which was and in the future
will be used to fund development and acquisition of additional rental
properties. Our unsecured line of credit had an aggregate of $101 million
outstanding as of January 14, 1999, bearing interest at LIBOR plus .80%. This
line of credit matures in April 2001.
 
                      RATIOS OF EARNINGS TO FIXED CHARGES
 
    The Company's ratio of earnings to combined fixed charges and preferred
stock dividends for the nine months ended September 30, 1998 was 2.10. In
computing the ratio of earnings to combined fixed charges and preferred stock
dividends, earnings have been calculated by adding fixed charges, excluding
capitalized interest, to income before gains or losses on property sales and
minority interest in earnings of the Operating Partnership. Fixed charges
consist (if applicable) of interest costs, whether expensed or capitalized, the
interest component of rental expense, amortization of debt issuance costs and
preferred stock distributions.
 
    For information on the Company's ratios of earnings to combined fixed
charges and preferred stock dividends for prior years, see "Ratios of Earnings
to Fixed Charges" in the accompanying prospectus.
 
                                      S-5
<PAGE>
       DESCRIPTION OF THE SERIES E PREFERRED SHARES AND DEPOSITARY SHARES
 
    This description of the particular terms of the Series E Preferred Shares
and the depositary shares supplements, and to the extent inconsistent replaces,
the description of the general terms and provisions of the Preferred Stock and
Depositary Shares set forth in the accompanying prospectus, which you should
consult for further information.
 
GENERAL
 
    We are authorized to issue up to 5,000,000 preferred shares, $.01 par value
per share, in one or more series, with such designations, powers, preferences,
rights qualifications, limitations or restrictions as Indiana law and our board
of directors may determine by adoption of an applicable amendment to our Amended
and Restated Articles of Incorporation, without any further vote or action by
our shareholders. See "Description of Preferred Stock -- Terms" in the
accompanying prospectus.
 
    Prior to the completion of the offering, we will adopt an amendment
specifying a series of preferred shares consisting of up to 460,000 shares,
designated 8 1/4% Series E Cumulative Redeemable Preferred Shares. The following
summary of the terms and provisions of the Series E Preferred Shares is not
complete and is qualified in its entirety by reference to the pertinent sections
of the amendment designating the Series E Preferred Shares, which is available
from us.
 
    The transfer agent, registrar and dividends disbursing agent for the Series
E Preferred Shares will be American Stock Transfer & Trust Company.
 
    Each depositary share (a "Depositary Share") represents a 1/10 fractional
interest in a Series E Preferred Share. The Series E Preferred Shares will be
deposited with American Stock Transfer & Trust Company, as Depositary (the
"Depositary"), under a Deposit Agreement which we will enter into with the
Depositary. The Depositary will issue depositary receipts ("Depositary
Receipts") which will evidence the Depositary Shares. Subject to the terms of
the Deposit Agreement, each holder of a Depositary Receipt evidencing a
Depositary Share will be entitled to all the rights and preferences of a 1/10
fractional interest in a Series E Preferred Share (including distribution,
voting, redemption and liquidation rights and preferences). See "Description of
Depositary Shares" in the accompanying prospectus.
 
    We intend to file an application to list the Depositary Shares on the New
York Stock Exchange. If the application is approved, trading of the Depositary
Shares on the New York Stock Exchange is expected to begin within a 30-day
period after the date of initial delivery of the Depositary Shares. See
"Underwriting." The Series E Preferred Shares will not be listed, and we do not
expect that there will be any trading market for the Series E Preferred Shares
except as represented by Depositary Shares.
 
RANKING
 
    The Series E Preferred Shares will rank senior to our common stock with
respect to payment of distributions or amounts upon our liquidation, dissolution
or winding up.
 
DISTRIBUTIONS
 
    Holders of the Series E Preferred Shares will be entitled to receive, when
and as authorized by our board of directors, out of funds legally available for
the payment of distributions, cumulative cash distributions at the rate of
8 1/4% of the liquidation preference per annum (equivalent to $2.0625 per annum
per Depositary Share). Distributions on the Series E Preferred Shares
represented by the Depositary Shares will accrue and be cumulative from the date
of original issue and will be payable quarterly in arrears on the last day of
each March, June, September and December or, if not a business day, the next
business day. The first distribution on the Series E Preferred Shares
represented by the Depositary Shares, which will be paid on or about March 31,
1999, will be for less than a full quarter. That distribution and any
distribution payable on the Series E Preferred Shares for any other partial
distribution period will be
 
                                      S-6
<PAGE>
computed on the basis of a 360-day year consisting of twelve 30-day months. We
will pay distributions to holders of record as they appear in our share records
at the close of business on the applicable record date designated by our board
of directors for the payment of distributions that is not more than 30 nor less
than 10 days prior to such distribution payment date.
 
    No distributions on the Series E Preferred Shares will be authorized by our
board of directors or be paid or set apart for payment at such time as the terms
and provisions of any of our agreements, including any agreement relating to our
indebtedness, prohibits such authorization, payment or setting apart for payment
or provides that such authorization, payment or setting apart for payment would
constitute a breach of or a default under such agreement, or if such
authorization or payment is restricted or prohibited by law. Covenants in our
revolving credit agreement provide generally that we may not pay distributions
in excess of 90% of Funds From Operations in any Fiscal Year, all as defined in
the particular agreement, but such covenants permit us, upon certain
circumstances, to pay distributions in an amount necessary to maintain our
qualification as a REIT. We do not believe that this provision has had or will
have any adverse impact on our ability to pay distributions in respect of the
Series E Preferred Shares or in the normal course of business to our
shareholders in amounts necessary to maintain our qualification as a REIT.
 
    Notwithstanding the foregoing, distributions on the Series E Preferred
Shares will accrue whether or not we have earnings, whether or not there are
funds legally available for the payment of such distributions and whether or not
such distributions are authorized. Accrued but unpaid distributions on the
Series E Preferred Shares will not bear interest, and holders of the Series E
Preferred Shares will not be entitled to any distributions in excess of full
cumulative distributions as described above. See "Description of Preferred Stock
- -- Dividends" in the accompanying prospectus.
 
    The Operating Partnership will be required to make all required
distributions on the Series E Preferred Units (which will mirror the payments of
distributions, including accrued and unpaid distributions upon redemption, and
of the liquidation preference amount on the Series E Preferred Shares) prior to
any distribution of cash or assets to the holders of non-preferred units, except
for distributions required to enable us to maintain our qualification as a REIT.
 
    Any distribution payment made on the Series E Preferred Shares will first be
credited against the earliest accrued but unpaid distribution due with respect
to such shares which remains payable.
 
    If, for any taxable year, we elect to designate as "capital gain dividends"
(as defined in Section 857 of the Code), any portion of the dividends paid or
made available for the year to holders of all classes of shares, then the
portion of the dividends so designated that is allocable to the holders of
Series E Preferred Shares will be the amount that the total dividends paid or
made available to the holders of the Series E Preferred Shares for the year
bears to the total dividends paid or made available for the year to holders of
all classes of shares.
 
LIQUIDATION RIGHTS
 
    In the event of any liquidation, dissolution or winding up of our affairs,
the holders of the Series E Preferred Shares are entitled to be paid out of our
assets legally available for distribution to our shareholders liquidating
distributions in cash or property at its fair market value as determined by our
board of directors in the amount of a liquidation preference of $250.00 per
share (equivalent to $25.00 per Depositary Share), plus an amount equal to any
accrued and unpaid distributions to the date of such liquidation, dissolution or
winding up, before any distribution of assets is made to holders of common stock
or any other capital shares that rank junior to the Series E 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 E Preferred
Shares will have no right or claim to any of our remaining assets. If we
consolidate or merge with or into any other entity or we sell, lease, transfer
or convey all or substantially all of our property or business, we will not be
deemed to have liquidated, dissolved or wound up. For further information
regarding the rights of the holders of the Series E Preferred Shares and related
Depositary
 
                                      S-7
<PAGE>
Shares upon our liquidation, dissolution or winding, see "Description of
Preferred Stock -- Liquidation Preference" and "Description of Depositary Shares
- -- Liquidation Preference" in the accompanying prospectus.
 
REDEMPTION BY THE COMPANY
 
    The Series E Preferred Shares are not redeemable prior to January 20, 2004.
On and after January 20, 2004, at our option upon not less than 30 nor more than
60 days' written notice, we may redeem the Series E Preferred Shares (and the
Depositary will redeem the number of Depositary Shares representing the Series E
Preferred Shares so redeemed upon not less than 30 days' written notice to their
holders), in whole or in part, at any time or from time to time, at a redemption
price of $250.00 per share (equivalent to $25.00 per Depositary Share), plus all
accrued and unpaid distributions thereon to the date fixed for redemption
(except as provided below), without interest, to the extent we have funds
legally available. The redemption price of the Series E Preferred Shares (other
than any portion consisting of accrued and unpaid distributions) may be paid
solely from the sale proceeds of other shares of our capital stock and not from
any other source. For purposes of the preceding sentence, "capital stock" means
any common stock, preferred stock, depositary shares, interests, 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 Depositary Receipts
evidencing Depositary Shares to be redeemed shall surrender such Depositary
Receipts at the place designated in such notice and shall be entitled to the
redemption price and any accrued and unpaid distributions payable upon such
redemption following such surrender. If notice of redemption of any Depositary
Shares has been given and if the funds necessary for such redemption have been
set aside by us in trust for the benefit of the holders of any Depositary Shares
so called for redemption, then from and after the redemption date distributions
will cease to accrue on such Depositary Shares, such Depositary 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 fewer than all
of the outstanding Depositary Shares are to be redeemed, the Depositary Shares
to be redeemed will be selected pro rata (as nearly as may be practicable
without creating fractional Depositary Shares) or by any other equitable method
we determine to use. See "Description of Preferred Stock -- Redemption" in the
accompanying prospectus.
 
    We will give notice of redemption 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' prior to
the redemption date. A similar notice furnished by us will be mailed by the
Depositary, postage prepaid, not less than 30 nor more than 60 days' prior to
the redemption date, addressed to the respective holders of record of the
Depositary Receipts evidencing the Depositary Shares to be redeemed at their
respective addresses as they appear on the share transfer records of the
Depositary. A failure to give such notice or any defect in the notice or in its
mailing will not affect the validity of the proceedings for the redemption of
any Series E Preferred Shares or Depositary Shares except as to the holder to
whom notice was defective or not given. Each notice shall state:
 
    - the redemption date;
 
    - the redemption price;
 
    - the number of Series E Preferred Shares to be redeemed (and the
      corresponding number of Depositary Shares);
 
    - the place or places where the Depositary Receipts evidencing the
      Depositary Shares are to be surrendered for payment of the redemption
      price; and
 
    - that distributions on the shares to be redeemed will cease to accrue on
      such redemption date.
 
If fewer than all the Depositary Shares held by any holder are to be redeemed,
the notice mailed to such holder shall also specify the number of Depositary
Shares to be redeemed from such holder.
 
                                      S-8
<PAGE>
    The holders of Depositary Receipts at the close of business on a
distribution record date will be entitled to receive the distribution payable
with respect to the Depositary Shares evidenced by such Depositary Receipts on
the corresponding distribution payment date notwithstanding the redemption of
the Depositary Shares between such distribution record date and the
corresponding distribution payment date or our default in the payment of the
distribution due. Except as provided above, we will make no payment or allowance
for unpaid distributions, whether or not in arrears, on Series E Preferred
Shares or Depositary Shares to be redeemed.
 
    The Series E Preferred Shares have no stated maturity and will not be
subject to any sinking fund or mandatory redemption provisions (except as
provided under "Restrictions on Transfer" below).
 
VOTING RIGHTS
 
    Holders of Series E Preferred Shares will not have any voting rights, except
as set forth below or as otherwise required by law.
 
    In any matter in which the Series E Preferred Shares are entitled to vote
(as described herein or as may be required by law), including any action by
written consent, each Series E Preferred Share will be entitled to 10 votes,
each of which 10 votes may be directed separately by the holder thereof (or by
any proxy or proxies of such holder). The holder of each Series E Preferred
Share may designate up to 10 proxies, with each such proxy having the right to
vote a whole number of votes (totaling 10 votes per Series E Preferred Share).
As a result, each Depositary Share will be entitled to one vote.
 
    If distributions on the Series E Preferred Shares are in arrears for six or
more quarterly periods, whether or not such quarterly periods are consecutive,
holders of the Depositary Shares representing the Series E Preferred Shares
(voting separately as a class with all other series of preferred shares upon
which like voting rights have been conferred and are exercisable) will be
entitled to vote for the election of two additional directors to serve on our
board of directors until all distribution arrearages have been paid. For further
information regarding the voting rights of the holders of the Series E Preferred
Shares and related Depositary Shares, see "Description of Preferred Stock --
Voting Rights" and "Description of Depositary Shares -- Voting of the Preferred
Stock" in the accompanying prospectus.
 
CONVERSION RIGHTS
 
    The Series E Preferred Shares are not convertible into or exchangeable for
any other property or securities of the Company.
 
RESTRICTIONS ON TRANSFER
 
    For information regarding restrictions on transfer of the Series E Preferred
Shares and related Depositary Shares, see "Description of Preferred
Stock--Restrictions on Ownership" in the accompanying prospectus.
 
BOOK-ENTRY ONLY ISSUANCE -- THE DEPOSITORY TRUST COMPANY
 
    The Depositary Shares will be represented by one global security that will
be deposited with and registered in the name of The Depositary Trust Company
("DTC") or its nominee. This means that we will not issue certificates to you
for the shares. One global security will be issued to DTC, who will keep a
computerized record of its participants (for example, your broker) whose clients
have purchased the shares. Each participant will then keep a record of its
clients. Unless it is exchanged in whole or in part for a certificated security,
a global security may not be transferred. However, DTC, its nominees, and their
successors may transfer a global security as a whole to one another. Beneficial
interests in the global security will be shown on, and transfers of the global
security will be made only through, records maintained by DTC and its
participants.
 
                                      S-9
<PAGE>
    DTC is a limited-purpose trust company organized under the New York Banking
Law, a "banking organization" within the meaning of the New York Banking Law, a
member of the United States Federal Reserve System, a "clearing corporation"
within the meaning of the New York Uniform Commercial Code and a "clearing
agency" registered under the provisions of Section 17A of the Securities
Exchange Act of 1934. DTC holds securities that its participants (direct
participants) deposit with DTC. DTC also records the settlement among direct
participants of securities transactions, such as transfers and pledges, in
deposited securities through computerized records for direct participant's
accounts. This eliminates the need to exchange certificates. Direct participants
include securities brokers and dealers, banks, trust companies, clearing
corporations and certain other organizations.
 
    DTC's book-entry system is also used by other organizations such as
securities brokers and dealers, banks and trust companies that work through a
direct participant. The rules that apply to DTC and its participants are on file
with the Securities and Exchange Commission.
 
    DTC is owned by a number of its direct participants and by the New York
Stock Exchange, Inc., the American Stock Exchange, Inc. and the National
Association of Securities Dealers, Inc.
 
    When you purchase shares through the DTC system, the purchases must be made
by or through a direct participant, who will receive credit for the shares on
DTC's records. Since you actually own the shares, you are the beneficial owner
and your ownership interest will only be recorded on the direct (or indirect)
participants' records. DTC has no knowledge of your individual ownership of the
Depositary Shares. DTC's records only show the identity of the direct
participants and the amount of the shares held by or through them. You will not
receive a written confirmation of your purchase or sale or any periodic account
statement directly from DTC. You will receive these from your direct (or
indirect) participant. Thus the direct (or indirect) participants are
responsible for keeping accurate account of the holdings of their customers like
you.
 
    We will wire dividend payments to DTC's nominee and we will treat DTC's
nominee as the owner of the global security for all purposes. Accordingly, we
will have no direct responsibility or liability to pay amounts due on the global
security to you or any other beneficial owners in the global security.
 
    Any redemption notices will be sent by us directly to DTC, who will in turn
inform the direct participants, who will then contact you as a beneficial
holder.
 
    It is DTC's current practice, upon receipt of any payment of dividends or
liquidation amount, to credit direct participants's accounts on the payment date
based on their holdings of beneficial interests in the global securities as
shown on DTC's records. In addition, it is DTC's current practice to assign any
consenting or voting rights to direct participants whose accounts are credited
with preferred securities on a record date, by using an omnibus proxy. Payments
by participants to owners of beneficial interests in the global securities, and
voting by participants, will be based on the customary practices between the
participants and owners of beneficial interests, as is the case with the shares
held for the account of customers registered in "street name." However, payments
will be the responsibility of the participants and not of DTC or us.
 
    Depositary Shares represented by a global security will be exchangeable for
certificated securities with the same terms in authorized denominations only if:
 
    - DTC is unwilling or unable to continue as depositary or if DTC ceases to
      be clearing agency registered under applicable law and a successor
      depositary is not appointed by us within 90 days; or
 
    - We determine not to require all of the Depositary Shares to be represented
      by a global security.
 
    If the book-entry-only system is discontinued, the transfer agent will keep
the registration books for the Depositary Shares at its corporate office.
 
                                      S-10
<PAGE>
                   CERTAIN FEDERAL INCOME TAX CONSIDERATIONS
 
    For a discussion of material federal income tax consequences applicable to
distributions to shareholders and our election to be taxed as a REIT, see
"Federal Income Tax Considerations" in the accompanying prospectus.
 
GENERAL
 
    The following discussion summarizes certain Federal income tax consequences
to an investor in Depositary Shares. Such discussion is based upon current law.
The discussion does not address all tax considerations applicable to prospective
investors, nor does the discussion give a detailed description of any state,
local, or foreign tax considerations. This discussion does not describe all of
the aspects of Federal income taxation that may be relevant to a prospective
shareholder in light of his or her particular circumstances or to certain types
of shareholders (including insurance companies, tax-exempt entities, financial
institutions or broker dealers, foreign corporations and persons who are not
citizens or residents of the United States) subject to special treatment under
the Federal income tax laws. As used in this section, the term "Company" refers
solely to Duke Realty Investments, Inc.
 
    EACH PROSPECTIVE PURCHASER IS ADVISED TO CONSULT WITH HIS OR HER OWN TAX
ADVISOR REGARDING THE SPECIFIC TAX CONSEQUENCES TO HIM OR HER OF THE PURCHASE,
OWNERSHIP AND SALE OF DEPOSITARY SHARES REPRESENTING PREFERRED STOCK IN AN
ENTITY ELECTING TO BE TAXED AS A REAL ESTATE INVESTMENT TRUST, INCLUDING THE
FEDERAL, STATE AND LOCAL TAX CONSEQUENCES OF SUCH PURCHASE, OWNERSHIP, SALE AND
ELECTION AND OF POTENTIAL CHANGES IN APPLICABLE TAX LAWS.
 
REDEMPTION OF SERIES E PREFERRED SHARES AND DEPOSITARY SHARES
 
    A redemption of Series E Preferred Shares, and a consequent redemption of
the Depositary Shares representing such Series E Preferred Shares, will be
treated under Section 302 of the Code as a distribution taxable as a dividend
(to the extent of the Company's current and accumulated earnings and profits) at
ordinary income rates unless the redemption satisfies one of the tests set forth
in Section 302(b) of the Code and is therefore treated as a sale or exchange of
the redeemed shares. None of these dividend distributions will be eligible for
the dividends received deduction for corporate shareholders. The redemption will
be treated as a sale or exchange if it (i) is "substantially disproportionate"
with respect to the holder, (ii) results in a "complete termination" of the
holder's share 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,
Depositary Shares considered to be owned by the holder by reason of certain
constructive ownership rules set forth in the Code, as well as Depositary Shares
actually owned by the holder, must generally be taken into account. If a
particular holder of Depositary Shares owns (actually or constructively) no
shares of common stock of the Company, or an insubstantial percentage of the
outstanding shares of common stock of the Company, a redemption of Depositary
Shares of that holder is likely to qualify for sale or exchange treatment
because the redemption would not be "essentially equivalent to a dividend."
However, because the determination as to whether any of the alternative tests of
Section 302(b) of the Code will be satisfied with respect to any particular
holder of Depositary Shares depends upon the facts and circumstances at the time
that the determination must be made, prospective holders of Depositary Shares
are advised to consult their own tax advisors to determine such tax treatment.
 
    If a redemption of Depositary Shares is not treated as a distribution
taxable as a dividend to a particular holder, it will be treated as to that
holder as a taxable sale or exchange. As a result, such holder 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 (less any portion thereof attributable to accumulated and
declared but unpaid dividends, which will be taxable as a dividend to the extent
of the Company's current and accumulated earnings and profits), and (ii) the
holder's adjusted basis
 
                                      S-11
<PAGE>
in the Depositary Shares for tax purposes. Such gain or loss will be capital
gain or loss if the Depositary Shares have been held as a capital asset, and
will be long-term gain or loss if such Depositary Shares have been held for more
than one year.
 
    If a redemption of Depositary Shares is treated as a distribution 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 holder. The
holder's adjusted basis in the redeemed Depositary Shares for tax purposes will
be transferred to the holder's remaining shares of the Company. If the holder
owns no other shares of the Company, such basis may, under certain
circumstances, be transferred to a related person or it may be lost entirely.
 
IRS RESTRUCTURING ACT
 
    You should be aware that, as discussed in the accompanying prospectus, the
Taxpayer Relief Act of 1997 (the "1997 Act") altered the taxation of capital
gain income. The recently-enacted IRS Restructuring Act reduced the holding
periods established by the 1997 Act. Under the 1997 Act, as revised by the IRS
Restructuring Act, for gains realized after December 31, 1997, and subject to
certain exceptions:
 
    - the maximum rate of tax on net capital gains of individuals, trusts and
      estates from the sale or exchange of assets held for more than 12 months
      has been reduced to 20%;
 
    - the maximum rate of tax on net capital gains of individuals, trusts and
      estates from the sale or exchange of assets is reduced to 18% for assets
      acquired after December 31, 2000 and held for more than five years;
 
    - for taxpayers who would be subject to a maximum tax rate of 15%, the rate
      on net capital gains is reduced to 10%;
 
    - for taxpayers who would be subject to a maximum tax rate of 15%, effective
      for taxable years commencing after December 31, 2000, the rate on net
      capital gains is reduced to 8% for assets held for more than five years;
 
    - the maximum rate for net capital gains attributable to the sale of
      depreciable real property held for more than 12 months is generally 25% to
      the extent of the deductions for depreciation with respect to such
      property; and
 
    - long-term capital gain we allocate to a shareholder will generally be
      subject to the 25% rate to the extent that the gain does not exceed
      depreciation on real property we sell.
 
The 1997 Act provides the Internal Revenue Service with authority to issue
regulations that could, among other things, apply these rates to sales of
capital assets by "pass through entities" (including REITs) and to sales of
interests in "pass through entities." The taxation of capital gains of
corporations was not changed by the 1997 Act or the IRS Restructuring Act.
 
                                      S-12
<PAGE>
                                  UNDERWRITING
 
    Subject to the terms and conditions contained in the terms agreement and
related underwriting agreement, we have agreed to sell to each of the
underwriters named below, and each of the underwriters named below has severally
agreed to purchase from us, the respective number of Depositary Shares set forth
after its name below. The obligations of the underwriters are subject to certain
conditions. The underwriters must purchase all of the shares if they purchase
any.
 
<TABLE>
<CAPTION>
                                                                                   NUMBER OF
                                                                                   DEPOSITARY
             UNDERWRITER                                                             SHARES
                                                                                   ----------
<S>                                                                                <C>
Merrill Lynch, Pierce, Fenner & Smith
          Incorporated...........................................................     735,000
A.G. Edwards & Sons, Inc.........................................................     735,000
Morgan Stanley & Co. Incorporated................................................     735,000
PaineWebber Incorporated.........................................................     735,000
Salomon Smith Barney Inc.........................................................     735,000
BT Alex. Brown Incorporated......................................................      25,000
Robert W. Baird & Co. Incorporated...............................................      25,000
CIBC Oppenheimer Corp............................................................      25,000
Dain Rauscher Incorporated.......................................................      25,000
EVEREN Securities, Inc...........................................................      25,000
Legg Mason Wood Walker, Incorporated.............................................      25,000
NationsBanc Montgomery Securities LLC............................................      25,000
Piper Jaffray Inc................................................................      25,000
Raymond James & Associates, Inc..................................................      25,000
Roney Capital Markets, A Division of First Chicago Capital Markets, Inc..........      25,000
SG Cowen Securities Corporation..................................................      25,000
Tucker Anthony Incorporated......................................................      25,000
Wheat First Securities, Inc......................................................      25,000
                                                                                   ----------
          Total..................................................................   4,000,000
                                                                                   ----------
                                                                                   ----------
</TABLE>
 
    The underwriters have advised us that they propose initially to offer the
Depositary Shares to the public at the public offering price set forth on the
cover page of this prospectus supplement, and to certain dealers at such price
less a concession not in excess of $.50 per share. The underwriters may allow,
and such dealers may reallow, a discount not in excess of $.35 to certain other
dealers. After the offering, the public offering price, concession and discounts
may be changed.
 
    We have granted an option to the underwriters, exercisable during the 30-day
period after the date of this prospectus supplement, to purchase up to an
aggregate of 600,000 additional Depositary Shares at the price to the public set
forth on the cover page of this prospectus supplement, less the underwriting
discount. The underwriters may exercise this option only to cover
over-allotments, if any. If the underwriters exercise this option, each of the
underwriters will have a firm commitment, subject to certain conditions, to
purchase approximately the same percentage of the additional Depositary Shares
which the number of Depositary Shares to be purchased by it shown in the
foregoing table bears to the 4,000,000 Depositary Shares offered by this
prospectus supplement.
 
                                      S-13
<PAGE>
    The following table shows the per share and total public offering price,
underwriting discount and proceeds, before expenses, to the Company. The amounts
are shown assuming both no exercise and full exercise of the underwriters'
option to purchase 600,000 additional Depositary Shares.
 
<TABLE>
<CAPTION>
                                                      PER
                                                   DEPOSITARY     WITHOUT           WITH
                                                     SHARE         OPTION          OPTION
                                                   ----------  --------------  --------------
<S>                                                <C>         <C>             <C>
Public Offering Price............................      $25.00    $100,000,000    $115,000,000
Underwriting Discount............................      $.7875      $3,150,000      $3,622,500
Proceeds, before expenses, to Duke Realty
  Investments, Inc...............................    $24.2125     $96,850,000    $111,377,500
</TABLE>
 
    We expect to incur expenses of approximately $135,000 in connection with
this offering. These expenses are estimated to include printing costs of
$50,000, legal fees of $25,000, accounting fees of $10,000, New York Stock
Exchange listing fees of $44,300 and miscellaneous expenses of $5,700.
 
    Until the distribution of the Depositary Shares is completed, certain rules
of the Securities and Exchange Commission may limit the ability of the
underwriters to bid for and purchase Depositary Shares. As an exception to these
rules, the underwriters are permitted to engage in certain transactions that
stabilize the price of the Depositary Shares. Such transactions consist of bids
or purchases for the purpose of pegging, fixing or maintaining the price of the
Depositary Shares.
 
    If the underwriters create a short position in the Depositary Shares in
connection with this offering (I.E., if they sell more Depositary Shares than
are set forth on the cover page of this prospectus supplement), the underwriters
may reduce that short position by purchasing shares in the open market. The
underwriters may also elect to reduce any short position through the exercise of
all or part of the over-allotment option described above.
 
    In general, purchases of a security for the purpose of stabilization or to
reduce a short position could cause the price of the security to be higher than
it might be in the absence of such purchases.
 
    Neither the Company nor the underwriters make any representation or
prediction as to the direction or magnitude of any effect that the transactions
described above might have on the price of the Depositary Shares. In addition,
neither the Company nor the underwriters make any representation that the
underwriters will engage in such transactions or that such transactions, once
commenced, will not be discontinued without notice.
 
    We intend to file an application to list the Depositary Shares on the New
York Stock Exchange. If the application is approved, trading of the Depositary
Shares on the New York Stock Exchange is expected to commence within a 30-day
period after the initial delivery of the Depositary Shares. The underwriters
have advised us that they intend to make a market in the Depositary Shares prior
to the commencement of trading on the New York Stock Exchange. The underwriters
will have no obligation to make a market in the Depositary Shares, however, and
if they begin to make a market may cease market-making activities at any time.
 
    We have agreed to indemnify the underwriters against certain liabilities,
including liabilities under the Securities Act of 1933, as amended, or if
indemnification is not allowed, to contribute to payments the underwriters may
be required to make because of those liabilities
 
    Certain of the underwriters and their affiliates from time to time provide
investment banking and financial advisory services to us and have also acted as
representatives of various other underwriters in connection with public
offerings of our common stock, depositary shares and debt securities in 1993
through 1998.
 
                                      S-14
<PAGE>
                                 LEGAL MATTERS
 
    In addition to the legal opinions referred to under "Legal Opinions" in the
accompanying prospectus, the description of Federal income tax matters contained
in this prospectus supplement entitled "Certain Federal Income Tax
Considerations" is based on the opinion of Bose McKinney & Evans. The legality
of the shares of common stock will be passed upon for the underwriters by Rogers
& Wells LLP, New York, New York.
 
                                      S-15
<PAGE>
PROSPECTUS
 
                                 $1,000,000,000
 
                         DUKE REALTY INVESTMENTS, INC.
              COMMON STOCK, PREFERRED STOCK AND DEPOSITARY SHARES
 
                        DUKE REALTY LIMITED PARTNERSHIP
                                DEBT SECURITIES
 
    Duke Realty Investments, Inc. (the "Company") may from time to time offer in
one or more series (i) shares of Common Stock, $.01 par value ("Common Stock"),
(ii) shares of preferred stock, $.01 par value ("Preferred Stock") and (iii)
shares of Preferred Stock represented by depositary shares (the "Depositary
Shares"), with an aggregate public offering price of up to $650,000,000 (or its
equivalent in another currency based on the exchange rate at the time of sale)
in amounts, at prices and on terms to be determined at the time of offering.
Duke Realty Limited Partnership (the "Operating Partnership") may from time to
time offer in one or more series unsecured non-convertible investment grade debt
securities ("Debt Securities"), with an aggregate public offering price of up to
$350,000,000 (or its equivalent in another currency based on the exchange rate
at the time of sale) in amounts, at prices and on terms to be determined at the
time of offering. The Common Stock, Preferred Stock, Depositary Shares and Debt
Securities (collectively, the "Securities") may be offered, separately or
together, in separate series, in amounts, at prices and on terms to be set forth
in one or more supplements to this Prospectus (each a "Prospectus Supplement").
 
    The specific terms of the Securities in respect of which this Prospectus is
being delivered will be set forth in the applicable Prospectus Supplement and
will include, where applicable: (i) in the case of Common Stock, any initial
public offering price; (ii) in the case of Preferred Stock, the specific title
and stated value, any dividend, liquidation, redemption, conversion, voting and
other rights, and any initial public offering price; (iii) in the case of
Depositary Shares, the fractional share of Preferred Stock represented by each
such Depositary Share; and (iv) in the case of Debt Securities, the specific
title, aggregate principal amount, currency, form (which may be registered or
bearer, or certificated or global), authorized denominations, maturity, rate (or
manner of calculation thereof) and time of payment of interest, terms for
redemption at the option of the Operating Partnership or repayment at the option
of the holder, terms for sinking fund payments, covenants and any initial public
offering price. In addition, such specific terms may include limitations on
direct or beneficial ownership and restrictions on transfer of the Securities,
in each case as may be appropriate to preserve the status of the Company as a
real estate investment trust ("REIT") for federal income tax purposes.
 
    The applicable Prospectus Supplement will also contain information, where
applicable, about certain United States federal income tax considerations
relating to, and any listing on a securities exchange of, the Securities covered
by such Prospectus Supplement.
 
    The Securities may be offered directly, through agents designated from time
to time by the Company or the Operating Partnership, or to or through
underwriters or dealers. If any agents or underwriters are involved in the sale
of any of the Securities, their names, and any applicable purchase price, fee,
commission or discount arrangement between or among them, will be set forth, or
will be calculable from the information set forth, in an accompanying Prospectus
Supplement. See "Plan of Distribution." No Securities may be sold without
delivery of a Prospectus Supplement describing the method and terms of the
offering of such series of Securities.
 
                              -------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
  EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
    SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
      PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
           REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
                 The date of this Prospectus is April 20, 1998.
<PAGE>
                             AVAILABLE INFORMATION
 
    The Company and the Operating Partnership are subject to the informational
requirements of the Securities Exchange Act of 1934, as amended (the "Exchange
Act"), and, in accordance therewith, the Company files reports, proxy statements
and other information with the Securities and Exchange Commission (the
"Commission"), and the Operating Partnership files reports with the Commission.
Such reports, proxy statements and other information can be inspected and copied
at the Public Reference Section maintained by the Commission at Room 1024, 450
Fifth Street, N.W., Washington, D.C. 20549; Chicago Regional Office, 500 West
Madison Street, Suite 1400, Chicago, Illinois 60661; and New York Regional
Office, 7 World Trade Center, New York, New York 10048. Such reports, proxy
statements and other information concerning the Company can also be inspected at
the offices of the New York Stock Exchange, 20 Broad Street, New York, New York
10005. The Commission maintains a Web site (http:// www.sec.gov) that contains
reports, proxy and information statements and other information regarding the
Company and the Operating Partnership.
 
    The Company and the Operating Partnership will provide without charge to
each person to whom a copy of this Prospectus is delivered, upon their written
or oral request, a copy of any or all of the documents incorporated herein by
reference (other than exhibits to such documents). Written requests for such
copies should be addressed to 8888 Keystone Crossing, Suite 1200, Indianapolis,
Indiana 46240, Attn: Investor Relations, telephone number (317) 574-3531.
 
    The Company and the Operating Partnership have filed with the Commission a
registration statement on Form S-3 (the "Registration Statement") under the
Securities Act of 1933 as amended (the "Securities Act"), with respect to the
Securities offered hereby. For further information with respect to the Company,
the Operating Partnership and the Securities offered hereby, reference is made
to the Registration Statement and exhibits thereto. Statements contained in this
Prospectus as to the contents of any contract or other documents are not
necessarily complete, and in each instance, reference is made to the copy of
such contract or documents filed as an exhibit to the Registration Statement,
each such statement being qualified in all respects by such reference.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
    The following documents filed by the Company and the Operating Partnership
under the Exchange Act with the Commission are incorporated in this Prospectus
by reference and are made a part hereof:
 
    1.  The Company's Annual Report on Form 10-K (file no. 1-9044) for the year
        ended December 31, 1997.
 
    2.  The Operating Partnership's Annual Report on Form 10-K (file no.
        0-20625) for the year ended December 31, 1997.
 
    3.  The Company's proxy statement dated March 23, 1998.
 
    4.  The Company's Reports on Form 8-K (file no. 1-9044) filed February 26,
        1998 and March 27, 1998.
 
    5.  The Operating Partnership's Report on Form 8-K (file no. 0-20625) filed
        March 10, 1998.
 
    6.  The description of the Common Stock of the Company contained in the
        Registration Statement on Form 10, File No. 1-9044, as amended.
 
    Each document filed by the Company or the Operating Partnership subsequent
to the date of this Prospectus pursuant to Section 13(a), 13(c), 14 or 15(d) of
the Exchange Act and prior to termination of the offering of all Securities to
which this Prospectus relates shall be deemed to be incorporated by reference in
this Prospectus and shall be part hereof from the date of filing of such
document. Any statement contained herein or in a document incorporated or deemed
to be incorporated by reference herein shall be deemed to be modified or
superseded for purposes of this Prospectus to the extent that a statement
contained in this Prospectus (in the case of a statement in a previously-filed
document incorporated or deemed to be incorporated by reference herein), in any
accompanying Prospectus Supplement relating to a specific
 
                                       2
<PAGE>
offering of Securities or in any other subsequently filed document that is also
incorporated or deemed to be incorporated by reference herein, modifies or
supersedes such statement. Any such statement so modified or superseded shall
not be deemed, except as so modified or superseded, to constitute a part of this
Prospectus or any accompanying Prospectus Supplement. Subject to the foregoing,
all information appearing in this Prospectus and each accompanying Prospectus
Supplement is qualified in its entirety by the information appearing in the
documents incorporated by reference.
 
                   THE COMPANY AND THE OPERATING PARTNERSHIP
 
    The Company is a self-administered and self-managed real estate investment
trust that began operations through a related entity in 1972. At December 31,
1997, the Company owned direct or indirect interests in a portfolio of 355
in-service industrial, office and retail properties (the "Properties"), together
with over 1,700 acres of land (the "Land") for future development. The
Properties are located in Indiana, Ohio, Illinois, Kentucky, Minnesota,
Missouri, Tennessee and Wisconsin. As of December 31, 1997, the Properties
contained approximately 40.7 million square feet, which were approximately 94.1%
leased to approximately 2,300 tenants.
 
    All of the Company's interests in the Properties and Land are held by, and
substantially all of its operations relating to the Properties and Land are
conducted through, the Operating Partnership. The Operating Partnership holds a
100% interest in all but 74 of the Properties and substantially all of the Land.
The Company controls the Operating Partnership as the sole general partner and
owner, as of December 31, 1997, of approximately 87.4% of the outstanding units
of voting partnership interest of the Operating Partnership ("Units"). Each
Unit, other than those held by the Company, may be exchanged by the holder
thereof, subject to certain holding periods, for one share (subject to certain
adjustments) of the Common Stock. With each such exchange, the number of Units
owned by the Company and, therefore, the Company's percentage interest in the
Operating Partnership, will increase.
 
    In addition to owning the Properties and the Land, the Operating Partnership
also provides services associated with leasing, property management, real estate
development, construction and miscellaneous tenant services (the "Related
Businesses") for the Properties. The Company also provides services associated
with the Related Businesses to third parties through Duke Realty Services
Limited Partnership on a fee basis.
 
    The Company's experienced staff provides a full range of real estate
services from executive offices headquartered in Indianapolis, and from seven
regional offices located in the Cincinnati, Cleveland, Columbus, Decatur,
Minneapolis, Nashville and St. Louis metropolitan areas.
 
    The Company is an Indiana corporation that was originally incorporated in
the State of Delaware in 1985, and reincorporated in the State of Indiana in
1992. The Operating Partnership is an Indiana limited partnership that was
formed in 1993. The Company's and the Operating Partnership's executive offices
are located at 8888 Keystone Crossing, Suite 1200, Indianapolis, Indiana 46240,
and their telephone number is (317) 574-3531.
 
                                USE OF PROCEEDS
 
    The Company is required, by the terms of the partnership agreement of the
Operating Partnership, to invest the net proceeds of any sale of Common Stock,
Preferred Stock or Depositary Shares in the Operating Partnership in exchange
for additional Units or preferred Units, as the case may be. Unless otherwise
specified in the applicable Prospectus Supplement, the Company and the Operating
Partnership intend to use the net proceeds from the sale of Securities for
general corporate purposes, including the development and acquisition of
additional rental properties and other acquisition transactions, the payment of
certain outstanding debt, and improvements to certain properties in the
Company's portfolio.
 
                                       3
<PAGE>
                      RATIOS OF EARNINGS TO FIXED CHARGES
 
    The following table sets forth the Company's and the Operating Partnership's
ratios of earnings to fixed charges for the periods shown.
 
<TABLE>
<CAPTION>
YEAR ENDED                                                                                                OPERATING
DECEMBER 31,                                                                                  COMPANY    PARTNERSHIP
- ------------------------------------------------------------------------------------------  -----------  -----------
<S>                                                                                         <C>          <C>
1997......................................................................................        2.12         2.11
1996......................................................................................        2.18         2.20
1995......................................................................................        2.38         2.38
1994......................................................................................        2.33         2.33
1993......................................................................................        1.58         2.51(1)
</TABLE>
 
- ------------------------
 
(1) From date of formation on October 4, 1993 to December 31, 1993.
 
    For purposes of computing these ratios, earnings have been calculated by
adding fixed charges, excluding capitalized interest, to income (loss) before
gains or losses on property sales and (if applicable) minority interest in the
Operating Partnership. Fixed charges consist (if applicable) of interest costs,
whether expensed or capitalized, the interest component of rental expense and
amortization of debt issuance costs.
 
    The recapitalization of the Company effected in connection with the
reorganization permitted the Company to significantly deleverage, resulting in
an improved ratio of earnings to fixed charges for periods subsequent to the
reorganization.
 
                         DESCRIPTION OF DEBT SECURITIES
 
    The Debt Securities will be issued under an Indenture (the "Indenture")
between the Operating Partnership and The First National Bank of Chicago, as
trustee. The Indenture is incorporated by reference as an exhibit to the
Registration Statement of which this Prospectus is a part and is available for
inspection at the corporate trust office of the trustee at 14 Wall Street,
Eighth Floor, New York, New York 10005 or as described above under "Available
Information." The Indenture is subject to, and governed by, the Trust Indenture
Act of 1939, as amended (the "TIA"). The statements made herein relating to the
Indenture and the Debt Securities to be issued thereunder are summaries of
certain provisions thereof and do not purport to be complete and are subject to,
and are qualified in their entirety by reference to, all provisions of the
Indenture and such Debt Securities. All section references appearing herein are
to sections of the Indenture, and capitalized terms used but not defined herein
shall have the respective meanings set forth in the Indenture.
 
GENERAL
 
    The Debt Securities will be direct, unsecured obligations of the Operating
Partnership and will rank equally with all other unsecured and unsubordinated
indebtedness of the Operating Partnership. At December 31, 1997, the total
outstanding debt of the Operating Partnership was $720.1 million, of which
$367.1 million was secured debt and $353.0 million was unsecured debt. The Debt
Securities may be issued without limit as to aggregate principal amount, in one
or more series, in each case as established from time to time in or pursuant to
authority granted by a resolution of the Board of Directors of the Company as
sole general partner of the Operating Partnership or as established in one or
more indentures supplemental to the Indenture. All Debt Securities of one series
need not be issued at the same time and, unless otherwise provided, a series may
be reopened, without the consent of the holders of the Debt Securities of such
series, for issuances of additional Debt Securities of such series (Section
301).
 
    The Indenture provides that there may be more than one trustee (the
"Trustee") thereunder, each with respect to one or more series of Debt
Securities. Any Trustee under the Indenture may resign or be removed with
respect to one or more series of Debt Securities, and a successor Trustee may be
appointed to act with respect to such series (Section 608). In the event that
two or more persons are acting as Trustee with respect
 
                                       4
<PAGE>
to different series of Debt Securities, each such Trustee shall be a trustee of
a trust under the Indenture separate and apart from the trust administered by
any other Trustee (Section 609), and, except as otherwise indicated herein, any
action described herein to be taken by a Trustee may be taken by each such
Trustee with respect to, and only with respect to, the one or more series of
Debt Securities for which it is Trustee under the Indenture.
 
    Reference is made to the Prospectus Supplement relating to the series of
Debt Securities being offered for the specific terms thereof, including:
 
    (1) the title of such Debt Securities;
 
    (2) the aggregate principal amount of such Debt Securities and any limit on
        such aggregate principal amount;
 
    (3) the percentage of the principal amount at which such Debt Securities
        will be issued and, if other than the principal amount thereof, the
        portion of the principal amount thereof payable upon declaration of
        acceleration of the maturity thereof;
 
    (4) the date or dates, or the method for determining such date or dates, on
        which the principal of such Debt Securities will be payable;
 
    (5) the rate or rates (which may be fixed or variable), or the method by
        which such rate or rates shall be determined, at which such Debt
        Securities will bear interest, if any;
 
    (6) the date or dates, or the method for determining such date or dates,
        from which any interest will accrue, the dates on which any such
        interest will be payable, the record dates for such interest payment
        dates, or the method by which any such date shall be determined, the
        person to whom such interest shall be payable, and the basis upon which
        interest shall be calculated if other than that of a 360-day year of
        twelve 30-day months;
 
    (7) the place or places where the principal of (and premium, if any) and
        interest, if any, on such Debt Securities will be payable, such Debt
        Securities may be surrendered for registration of transfer or exchange
        and notices or demands to or upon the Operating Partnership in respect
        of such Debt Securities and the Indenture may be served;
 
    (8) the period or periods within which, the price or prices at which and the
        terms and conditions upon which such Debt Securities may be redeemed, as
        a whole or in part, at the option of the Operating Partnership, if the
        Operating Partnership is to have such an option;
 
    (9) the obligation, if any, of the Operating Partnership to redeem, repay or
        purchase such Debt Securities pursuant to any sinking fund or analogous
        provision or at the option of a holder thereof, and the period or
        periods within which, the price or prices at which and the terms and
        conditions upon which such Debt Securities will be redeemed, repaid or
        purchased, as a whole or in part, pursuant to such obligation;
 
   (10) if other than U.S. dollars, the currency or currencies in which such
        Debt Securities are denominated and payable, which may be a foreign
        currency or units of two or more foreign currencies or a composite
        currency or currencies, and the terms and conditions relating thereto;
 
   (11) whether the amount of payments of principal of (and premium, if any) or
        interest, if any, on such Debt Securities may be determined with
        reference to an index, formula or other method (which index, formula or
        method may, but need not be, based on a currency, currencies, currency
        unit or units or composite currency or currencies) and the manner in
        which such amounts shall be determined;
 
   (12) the events of default or covenants of such Debt Securities, to the
        extent different from or in addition to those described herein;
 
                                       5
<PAGE>
   (13) whether such Debt Securities will be issued in certificated and/or
        book-entry form;
 
   (14) whether such Debt Securities will be in registered or bearer form and,
        if in registered form, the denominations thereof if other than $1,000
        and any integral multiple thereof and, if in bearer form, the
        denominations thereof if other than $5,000 and terms and conditions
        relating thereto;
 
   (15) the applicability, if any, of the defeasance and covenant defeasance
        provisions described herein, or any modification thereof;
 
   (16) if such Debt Securities are to be issued upon the exercise of debt
        warrants, the time, manner and place for such Debt Securities to be
        authenticated and delivered;
 
   (17) whether and under what circumstances the Operating Partnership will pay
        additional amounts on such Debt Securities in respect of any tax,
        assessment or governmental charge and, if so, whether the Operating
        Partnership will have the option to redeem such Debt Securities in lieu
        of making such payment;
 
   (18) with respect to any Debt Securities that provide for optional redemption
        or prepayment upon the occurrence of certain events (such as a change of
        control of the Operating Partnership), (i) the possible effects of such
        provisions on the market price of the Operating Partnership's or the
        Company's securities or in deterring certain mergers, tender offers or
        other takeover attempts, and the intention of the Operating Partnership
        to comply with the requirements of Rule 14e-1 under the Exchange Act and
        any other applicable securities laws in connection with such provisions;
        (ii) whether the occurrence of the specified events may give rise to
        cross-defaults on other indebtedness such that payment on such Debt
        Securities may be effectively subordinated; and (iii) the existence of
        any limitation on the Operating Partnership's financial or legal ability
        to repurchase such Debt Securities upon the occurrence of such an event
        (including, if true, the lack of assurance that such a repurchase can be
        effected) and the impact, if any, under the Indenture of such a failure,
        including whether and under what circumstances such a failure may
        constitute an Event of Default; and
 
   (19) any other terms of such Debt Securities.
 
    The Debt Securities may provide for less than the entire principal amount
thereof to be payable upon declaration of acceleration of the maturity thereof
("Original Issue Discount Securities"). If material or applicable, special U.S.
federal income tax, accounting and other considerations applicable to Original
Issue Discount Securities will be described in the applicable Prospectus
Supplement.
 
    Except as described under "Merger, Consolidation or Sale" or as may be set
forth in any Prospectus Supplement, the Indenture does not contain any other
provisions that would limit the ability of the Operating Partnership to incur
indebtedness or that would afford holders of the Debt Securities protection in
the event of (i) a highly leveraged or similar transaction involving the
Operating Partnership, the management of the Operating Partnership or the
Company, or any affiliate of any such party, (ii) a change of control, or (iii)
a reorganization, restructuring, merger or similar transaction involving the
Operating Partnership that may adversely affect the holders of the Debt
Securities. In addition, subject to the limitations set forth under "Merger,
Consolidation or Sale," the Operating Partnership may, in the future, enter into
certain transactions, such as the sale of all or substantially all of its assets
or the merger or consolidation of the Operating Partnership, that would increase
the amount of the Operating Partnership's indebtedness or substantially reduce
or eliminate the Operating Partnership's assets, which may have an adverse
effect on the Operating Partnership's ability to service its indebtedness,
including the Debt Securities. In addition, restrictions on ownership and
transfers of the Company's common stock and preferred stock are designed to
preserve its status as a REIT and, therefore, may act to prevent or hinder a
change of control. See "Description of Common Stock -- Certain Provisions
Affecting Change of Control" and "Description of Preferred Stock -- Restrictions
on Ownership." Reference is made to the applicable Prospectus Supplement
 
                                       6
<PAGE>
for information with respect to any deletions from, modifications of or
additions to the events of default or covenants that are described below,
including any addition of a covenant or other provision providing event risk or
similar protection.
 
    Reference is made to "-- Certain Covenants" below and to the description of
any additional covenants with respect to a series of Debt Securities in the
applicable Prospectus Supplement. Except as otherwise described in the
applicable Prospectus Supplement, compliance with such covenants generally may
not be waived with respect to a series of Debt Securities by the Board of
Directors of the Company as sole general partner of the Operating Partnership or
by the Trustee unless the Holders of at least a majority in principal amount of
all outstanding Debt Securities of such series consent to such waiver, except to
the extent that the defeasance and covenant defeasance provisions of the
Indenture described under "-- Discharge, Defeasance and Covenant Defeasance"
below apply to such series of Debt Securities. See "-- Modification of the
Indenture."
 
DENOMINATIONS, INTEREST, REGISTRATION AND TRANSFER
 
    Unless otherwise described in the applicable Prospectus Supplement, the Debt
Securities of any series which are registered securities, other than registered
securities issued in global form (which may be of any denomination), shall be
issuable in denominations of $1,000 and any integral multiple thereof and the
Debt Securities which are bearer securities, other than bearer securities issued
in global form (which may be of any denomination), shall be issuable in
denominations of $5,000 (Section 302).
 
    Unless otherwise specified in the applicable Prospectus Supplement, the
principal of (and premium, if any) and interest on any series of Debt Securities
will be payable at the corporate trust office of the Trustee, initially located
at 14 Wall Street, Eighth Floor, New York, New York, 10005, provided that, at
the option of the Operating Partnership, payment of interest may be made by
check mailed to the address of the Person entitled thereto as it appears in the
applicable Security Register or by wire transfer of funds to such Person at an
account maintained within the United States (Sections 301, 307 and 1002).
 
    Any interest not punctually paid or duly provided for on any Interest
Payment Date with respect to a Debt Security ("Defaulted Interest") will
forthwith cease to be payable to the Holder on the applicable Regular Record
Date and may either be paid to the Person in whose name such Debt Security is
registered at the close of business on a special record date (the "Special
Record Date") for the payment of such Defaulted Interest to be fixed by the
Trustee, notice whereof shall be given to the Holder of such Debt Security not
less than 10 days prior to such Special Record Date, or may be paid at any time
in any other lawful manner, all as more completely described in the Indenture.
 
    Subject to certain limitations imposed upon Debt Securities issued in
book-entry form, the Debt Securities of any series will be exchangeable for
other Debt Securities of the same series and of a like aggregate principal
amount and tenor of different authorized denominations upon surrender of such
Debt Securities at the corporate trust office of the Trustee referred to above.
In addition, subject to certain limitations imposed upon Debt Securities issued
in book-entry form, the Debt Securities of any series may be surrendered for
registration of transfer thereof at the corporate trust office of the Trustee
referred to above. Every Debt Security surrendered for registration of transfer
or exchange shall be duly endorsed or accompanied by a written instrument of
transfer. No service charge will be made for any registration of transfer or
exchange of any Debt Securities, but the Trustee or the Operating Partnership
may require payment of a sum sufficient to cover any tax or other governmental
charge payable in connection therewith (Section 305). If the applicable
Prospectus Supplement refers to any transfer agent (in addition to the Trustee)
initially designated by the Operating Partnership with respect to any series of
Debt Securities, the Operating Partnership may at any time rescind the
designation of any such transfer agent or approve a change in the location
through which any such transfer agent acts, except that Operating Partnership
will be required to maintain a transfer agent in each place of payment for such
series. The Operating Partnership may at any time designate additional transfer
agents with respect to any series of Debt Securities (Section 1002).
 
                                       7
<PAGE>
    Neither the Operating Partnership nor the Trustee shall be required (i) to
issue, register the transfer of or exchange any Debt Security if such Debt
Security may be among those selected for redemption during a period beginning at
the opening of business 15 days before selection of the Debt Securities to be
redeemed and ending at the close of business on (A) if such Debt Securities are
issuable only as Registered Securities, the day of the mailing of the relevant
notice of redemption and (B) if such Debt Securities are issuable as Bearer
Securities, the day of the first publication of the relevant notice of
redemption or, if such Debt Securities are also issuable as Registered
Securities and there is no publication, the mailing of the relevant notice of
redemption, or (ii) to register the transfer of or exchange any Registered
Security so selected for redemption in whole or in part, except, in the case of
any Registered Security to be redeemed in part, the portion thereof not to be
redeemed, or (iii) to exchange any Bearer Security so selected for redemption
except that such a Bearer Security may be exchanged for a Registered Security of
that series and like tenor, PROVIDED that such Registered Security shall be
simultaneously surrendered for redemption, or (iv) to issue, register the
transfer of or exchange any Security which has been surrendered for repayment at
the option of the Holder, except the portion, if any, of such Debt Security not
to be so repaid (Section 305).
 
MERGER, CONSOLIDATION OR SALE
 
    The Operating Partnership may consolidate with, or sell, lease or convey all
or substantially all of its assets to, or merge with or into, any other entity,
provided that (a) the Operating Partnership shall be the continuing entity, or
the successor entity (if other than the Operating Partnership) formed by or
resulting from any such consolidation or merger or which shall have received the
transfer of such assets shall expressly assume payment of the principal of (and
premium, if any) and interest on all the Debt Securities and the due and
punctual performance and observance of all of the covenants and conditions
contained in the Indenture; (b) immediately after giving effect to such
transaction and treating any indebtedness which becomes an obligation of the
Operating Partnership or any Subsidiary as a result thereof as having been
incurred by the Operating Partnership or such Subsidiary at the time of such
transaction, no Event of Default under the Indenture, and no event which, after
notice or the lapse of time, or both, would become such an Event of Default,
shall have occurred and be continuing; and (c) an officer's certificate and
legal opinion covering such conditions shall be delivered to the Trustee
(Sections 801 and 803).
 
CERTAIN COVENANTS
 
    EXISTENCE.  Except as permitted under "Merger, Consolidation or Sale," the
Operating Partnership is required to do or cause to be done all things necessary
to preserve and keep in full force and effect its existence, rights and
franchises; PROVIDED, HOWEVER, that the Operating Partnership shall not be
required to preserve any right or franchise if it determines that the
preservation thereof is no longer desirable in the conduct of its business and
that the loss thereof is not disadvantageous in any material respect to the
Holders of the Debt Securities (Section 1007).
 
    MAINTENANCE OF PROPERTIES.  The Operating Partnership is required to cause
all of its material properties used or useful in the conduct of its business or
the business of any Subsidiary to be maintained and kept in good condition,
repair and working order and supplied with all necessary equipment and to cause
to be made all necessary repairs, renewals, replacements, betterments and
improvements thereof, all as in the judgment of the Operating Partnership may be
necessary so that the business carried on in connection therewith may be
properly and advantageously conducted at all times; PROVIDED, HOWEVER, that the
Operating Partnership and its Subsidiaries shall not be prevented from selling
or otherwise disposing for value their respective properties in the ordinary
course of business (Section 1008).
 
    INSURANCE.  The Operating Partnership is required to, and is required to
cause each of its Subsidiaries to, keep all of its insurable properties insured
against loss or damage at least equal to their then full insurable value with
financially sound and reputable insurance companies (Section 1009).
 
    PAYMENT OF TAXES AND OTHER CLAIMS.  The Operating Partnership is required to
pay or discharge or cause to be paid or discharged, before the same shall become
delinquent, (i) all taxes, assessments and governmental charges levied or
imposed upon it or any Subsidiary or upon its income, profits or property or
that of any
 
                                       8
<PAGE>
Subsidiary, and (ii) all lawful claims for labor, materials and supplies which,
if unpaid, might by law become a lien upon the property of the Operating
Partnership or any Subsidiary; PROVIDED, HOWEVER, that the Operating Partnership
shall not be required to pay or discharge or cause to be paid or discharged any
such tax, assessment, charge or claim whose amount, applicability or validity is
being contested in good faith by appropriate proceedings (Section 1010).
 
    PROVISION OF FINANCIAL INFORMATION.  The Holders of Debt Securities will be
provided with copies of the annual reports and quarterly reports of the
Operating Partnership. Whether or not the Operating Partnership is subject to
Section 13 or 15(d) of the Exchange Act and for so long as any Debt Securities
are outstanding, the Operating Partnership will, to the extent permitted under
the Exchange Act, be required to file with the Commission the annual reports,
quarterly reports and other documents which the Operating Partnership would have
been required to file with the Commission pursuant to such Section 13 or 15(d)
(the "Financial Statements") if the Operating Partnership were so subject, such
documents to be filed with the Commission on or prior to the respective dates
(the "Required Filing Dates") by which the Operating Partnership would have been
required so to file such documents if the Operating Partnership were so subject.
The Operating Partnership will also in any event (x) within 15 days of each
Required Filing Date (i) transmit by mail to all Holders of Debt Securities, as
their names and addresses appear in the Security Register, without cost to such
Holders, copies of the annual reports and quarterly reports which the Operating
Partnership would have been required to file with the Commission pursuant to
Section 13 or 15(d) of the Exchange Act if the Operating Partnership were
subject to such Sections and (ii) file with the Trustee copies of the annual
reports, quarterly reports and other documents which the Operating Partnership
would have been required to file with the Commission pursuant to Section 13 or
15(d) of the Exchange Act if the Operating Partnership were subject to such
Sections and (y) if filing such documents by the Operating Partnership with the
Commission is not permitted under the Exchange Act, promptly upon written
request and payment of the reasonable cost of duplication and delivery, supply
copies of such documents to any prospective Holder (Section 1011).
 
    ADDITIONAL COVENANTS.  Any additional or different covenants of the
Operating Partnership with respect to any series of Debt Securities will be set
forth in the Prospectus Supplement relating thereto.
 
EVENTS OF DEFAULT, NOTICE AND WAIVER
 
    The Indenture provides that the following events are "Events of Default"
with respect to any series of Debt Securities issued thereunder: (a) default for
30 days in the payment of any installment of interest on any Debt Security of
such series; (b) default in the payment of the principal of (or premium, if any,
on) any Debt Security of such series at its maturity; (c) default in making any
sinking fund payment as required for any Debt Security of such series; (d)
default in the performance of any other covenant of the Operating Partnership
contained in the Indenture (other than a covenant added to the Indenture solely
for the benefit of a series of Debt Securities issued thereunder other than such
series), such default having continued for 60 days after written notice as
provided in the Indenture; (e) default in the payment of an aggregate principal
amount exceeding $5,000,000 of any evidence of recourse indebtedness of the
Operating Partnership or any mortgage, indenture or other instrument under which
such indebtedness is issued or by which such indebtedness is secured, such
default having occurred after the expiration of any applicable grace period and
having resulted in the acceleration of the maturity of such indebtedness, but
only if such indebtedness is not discharged or such acceleration is not
rescinded or annulled; (f) certain events of bankruptcy, insolvency or
reorganization, or court appointment of a receiver, liquidator or trustee of the
Operating Partnership or any Significant Subsidiary or any of their respective
property; and (g) any other Event of Default provided with respect to a
particular series of Debt Securities. The term "Significant Subsidiary" means
each significant subsidiary (as defined in Regulation S-X promulgated under the
Securities Act) of the Operating Partnership.
 
    If an Event of Default under the Indenture with respect to Debt Securities
of any series at the time Outstanding occurs and is continuing, then in every
such case the Trustee or the Holders of not less than 25% in principal amount of
the Outstanding Debt Securities of that series may declare the principal amount
(or, if
 
                                       9
<PAGE>
the Debt Securities of that series are Original Issue Discount Securities or
Indexed Securities, such portion of the principal amount as may be specified in
the terms thereof) of all of the Debt Securities of that series to be due and
payable immediately by written notice thereof to the Operating Partnership (and
to the Trustee if given by the Holders). However, at any time after such a
declaration of acceleration with respect to Debt Securities of such series (or
of all Debt Securities then Outstanding under the Indenture, as the case may be)
has been made, but before a judgment or decree for payment of the money due has
been obtained by the Trustee, the Holders of not less than a majority in
principal amount of Outstanding Debt Securities of such series (or of all Debt
Securities then Outstanding under the Indenture, as the case may be) may rescind
and annul such declaration and its consequences if (a) the Operating Partnership
shall have deposited with the applicable Trustee all required payments of the
principal of (and premium, if any) and interest on the Debt Securities of such
series (or of all Debt Securities then Outstanding under the Indenture, as the
case may be), plus certain fees, expenses, disbursements and advances of the
Trustee and (b) all Events of Default, other than the non-payment of accelerated
principal of (or specified portion thereof), or premium (if any) or interest on
the Debt Securities of such series (or of all Debt Securities then Outstanding
under the Indenture, as the case may be) have been cured or waived as provided
in the Indenture (Section 502). The Indenture also provides that the Holders of
not less than a majority in principal amount of the Outstanding Debt Securities
of any series (or of all Debt Securities then Outstanding under the Indenture,
as the case may be) may waive any past default with respect to such series and
its consequences, except a default (x) in the payment of the principal of (or
premium, if any) or interest on any Debt Security or such series or (y) in
respect of a covenant or provision contained in the Indenture that cannot be
modified or amended without the consent of the Holder of each Outstanding Debt
Security affected thereby (Section 513).
 
    The Trustee will be required to give notice to the Holders of Debt
Securities within 90 days of a default under the Indenture unless such default
has been cured or waived; PROVIDED, HOWEVER, that the Trustee may withhold
notice to the Holders of any series of Debt Securities of any default with
respect to such series (except a default in the payment of the principal of (or
premium, if any) or interest on any Debt Security of such series or in the
payment of any sinking fund installment in respect of any Debt Security of such
series) if specified Responsible Officers of the Trustee consider such
withholding to be in the interest of such Holders (Section 601).
 
    The Indenture provides that no Holders of Debt Securities of any series may
institute any proceedings, judicial or otherwise, with respect to the Indenture
or for any remedy thereunder, except in the case of failure of the Trustee, for
60 days, to act after it has received a written request to institute proceedings
in respect of an Event of Default from the Holders of not less than 25% in
principal amount of the Outstanding Debt Securities of such series, as well as
an offer of indemnity reasonably satisfactory to it (Section 507). This
provision will not prevent, however, any holder of Debt Securities from
instituting suit for the enforcement of payment of the principal of (and
premium, if any) and interest on such Debt Securities at the respective due
dates thereof (Section 508).
 
    Subject to provisions in the Indenture relating to its duties in case of
default, the Trustee is under no obligation to exercise any of its rights or
powers under the Indenture at the request or direction of any Holders of any
series of Debt Securities then Outstanding under the Indenture, unless such
Holders shall have offered to the Trustee thereunder reasonable security or
indemnity (Section 602). The Holders of not less than a majority in principal
amount of the Outstanding Debt Securities of any series (or of all Debt
Securities then Outstanding under the Indenture, as the case may be) shall have
the right to direct the time, method and place of conducting any proceeding for
any remedy available to the Trustee, or of exercising any trust or power
conferred upon the Trustee. However, the Trustee may refuse to follow any
direction which is in conflict with any law or the Indenture, which may involve
the Trustee in personal liability or which may be unduly prejudicial to the
holders of Debt Securities of such series not joining therein (Section 512).
 
                                       10
<PAGE>
    Within 120 days after the close of each fiscal year, the Operating
Partnership must deliver to the Trustee a certificate, signed by one of several
specified officers of the Company, stating whether or not such officer has
knowledge of any default under the Indenture and, if so, specifying each such
default and the nature and status thereof.
 
MODIFICATION OF THE INDENTURE
 
    Modifications and amendments of the Indenture will be permitted to be made
only with the consent of the Holders of not less than a majority in principal
amount of all Outstanding Debt Securities or series of Outstanding Debt
Securities which are affected by such modification or amendment; PROVIDED,
HOWEVER, that no such modification or amendment may, without the consent of the
Holder of each such Debt Security affected thereby, (a) change the Stated
Maturity of the principal of, or premium (if any) or any installment of interest
on, any such Debt Security; (b) reduce the principal amount of, or the rate or
amount of interest on, or any premium payable on redemption of, any such Debt
Security, or reduce the amount of principal of an Original Issue Discount
Security that would be due and payable upon declaration of acceleration of the
maturity thereof or would be provable in bankruptcy, or adversely affect any
right of repayment of the holder of any such Debt Security; (c) change the place
of payment, or the coin or currency, for payment of principal of, premium, if
any, or interest on any such Debt Security; (d) impair the right to institute
suit for the enforcement of any payment on or with respect to any such Debt
Security; (e) reduce the above-stated percentage of outstanding Debt Securities
of any series necessary to modify or amend the Indenture, to waive compliance
with certain provisions thereof or certain defaults and consequences thereunder
or to reduce the quorum or voting requirements set forth in the Indenture; or
(f) modify any of the foregoing provisions or any of the provisions relating to
the waiver of certain past defaults or certain covenants, except to increase the
required percentage to effect such action or to provide that certain other
provisions may not be modified or waived without the consent of the Holder of
such Debt Security (Section 902).
 
    The Indenture provides that the Holders of not less than a majority in
principal amount of a series of Outstanding Debt Securities have the right to
waive compliance by the Operating Partnership with certain covenants relating to
such series of Debt Securities in the Indenture (Section 1014).
 
    Modifications and amendments of the Indenture will be permitted to be made
by the Operating Partnership and the Trustee without the consent of any Holder
of Debt Securities for any of the following purposes: (i) to evidence the
succession of another Person to the Operating Partnership as obligor under the
Indenture; (ii) to add to the covenants of the Operating Partnership for the
benefit of the Holders of all or any series of Debt Securities or to surrender
any right or power conferred upon the Operating Partnership in the Indenture;
(iii) to add Events of Default for the benefit of the Holders of all or any
series of Debt Securities; (iv) to add or change any provisions of the Indenture
to facilitate the issuance of, or to liberalize certain terms of, Debt
Securities in bearer form, or to permit or facilitate the issuance of Debt
Securities in uncertificated form, PROVIDED that such action shall not adversely
affect the interests of the Holders of the Debt Securities of any series in any
material respect; (v) to change or eliminate any provisions of the Indenture,
PROVIDED that any such change or elimination shall become effective only when
there are no Debt Securities Outstanding of any series created prior thereto
which are entitled to the benefit of such provision; (vi) to secure the Debt
Securities; (vii) to establish the form or terms of Debt Securities of any
series; (viii) to provide for the acceptance of appointment by a successor
Trustee or facilitate the administration of the trusts under the Indenture by
more than one Trustee; (ix) to cure any ambiguity, defect or inconsistency in
the Indenture, PROVIDED that such action shall not adversely affect the
interests of Holders of Debt Securities of any series in any material respect;
or (x) to supplement any of the provisions of the Indenture to the extent
necessary to permit or facilitate defeasance and discharge of any series of such
Debt Securities, PROVIDED that such action shall not adversely affect the
interests of the Holders of the Debt Securities of any series in any material
respect (Section 901).
 
    The Indenture provides that in determining whether the Holders of the
requisite principal amount of Outstanding Debt Securities of a series have given
any request, demand, authorization, direction, notice, consent or waiver
thereunder or whether a quorum is present at a meeting of Holders of Debt
Securities,
 
                                       11
<PAGE>
(i) the principal amount of an Original Issue Discount Security that shall be
deemed to be Outstanding shall be the amount of the principal thereof that would
be due and payable as of the date of such determination upon declaration of
acceleration of the maturity thereof, (ii) the principal amount of a Debt
Security denominated in a foreign currency that shall be deemed Outstanding
shall be the U.S. dollar equivalent, determined on the issue date for such Debt
Security, of the principal amount (or, in the case of an Original Issue Discount
Security, the U.S. dollar equivalent on the issue date of such Debt Security of
the amount determined as provided in (i) above), (iii) the principal amount of
an Indexed Security that shall be deemed Outstanding shall be the principal face
amount of such Indexed Security at original issuance, unless otherwise provided
with respect to such Indexed Security pursuant to the Indenture, and (iv) Debt
Securities owned by the Operating Partnership or any other obligor upon the Debt
Securities or any affiliate of the Operating Partnership or of such other
obligor shall be disregarded.
 
    The Indenture contains provisions for convening meetings of the Holders of
Debt Securities of a series (Section 1501). A meeting will be permitted to be
called at any time by the Trustee, and also, upon request, by the Operating
Partnership or the holders of at least 10% in principal amount of the
Outstanding Debt Securities of such series, in any such case upon notice given
as provided in the Indenture (Section 1502). Except for any consent that must be
given by the Holder of each Debt Security affected by certain modifications and
amendments of the Indenture, any resolution presented at a meeting or adjourned
meeting duly reconvened at which a quorum is present will be permitted to be
adopted by the affirmative vote of the Holders of a majority in principal amount
of the Outstanding Debt Securities of that series; PROVIDED, HOWEVER, that,
except as referred to above, any resolution with respect to any request, demand,
authorization, direction, notice, consent, waiver or other action that may be
made, given or taken by the Holders of a specified percentage, which is less
than a majority, in principal amount of the Outstanding Debt Securities of a
series may be adopted at a meeting or adjourned meeting duly reconvened at which
a quorum is present by the affirmative vote of the Holders of such specified
percentage in principal amount of the Outstanding Debt Securities of that
series. Any resolution passed or decision taken at any meeting of Holders of
Debt Securities of any series duly held in accordance with the Indenture will be
binding on all Holders of Debt Securities of that series. The quorum at any
meeting called to adopt a resolution, and at any reconvened meeting, will be
Persons holding or representing a majority in principal amount of the
Outstanding Debt Securities of a series; PROVIDED, HOWEVER, that if any action
is to be taken at such meeting with respect to a consent or waiver which may be
given by the Holders of not less than a specified percentage in principal amount
of the Outstanding Debt Securities of a series, the Persons holding or
representing such specified percentage in principal amount of the Outstanding
Debt Securities of such series will constitute a quorum (Section 1504).
 
    Notwithstanding the foregoing provisions, if any action is to be taken at a
meeting of Holders of Debt Securities of any series with respect to any request,
demand, authorization, direction, notice, consent, waiver or other action that
the Indenture expressly provides may be made, given or taken by the Holders of a
specified percentage in principal amount of all Outstanding Debt Securities
affected thereby, or of the Holders of such series and one or more additional
series: (i) there shall be no minimum quorum requirement for such meeting and
(ii) the principal amount of the Outstanding Debt Securities of such series that
vote in favor of such request, demand, authorization, direction, notice,
consent, waiver or other action shall be taken into account in determining
whether such request, demand, authorization, direction, notice, consent, waiver
or other action has been made, given or taken under the Indenture (Section
1504).
 
DISCHARGE, DEFEASANCE AND COVENANT DEFEASANCE
 
    The Operating Partnership may discharge certain obligations to Holders of
any series of Debt Securities that have not already been delivered to the
Trustee for cancellation and that either have become due and payable or will
become due and payable within one year (or scheduled for redemption within one
year) by irrevocably depositing with the Trustee, in trust, funds in such
currency or currencies, currency unit or units or composite currency or
currencies in which such Debt Securities are payable in an amount sufficient to
pay
 
                                       12
<PAGE>
the entire indebtedness on such Debt Securities in respect of principal (and
premium, if any) and interest to the date of such deposit (if such Debt
Securities have become due and payable) or to the Stated Maturity or Redemption
Date, as the case may be (Sections 1401 and 1404).
 
    The Indenture provides that, if the provisions of Article Fourteen are made
applicable to the Debt Securities of or within any series pursuant to Section
301 of the Indenture, the Operating Partnership may elect either (a) to defease
and be discharged from any and all obligations with respect to such Debt
Securities (except for the obligation to pay additional amounts, if any, upon
the occurrence of certain events of tax, assessment or governmental charge with
respect to payments on such Debt Securities and the obligations to register the
transfer or exchange of such Debt Securities, to replace temporary or mutilated,
destroyed, lost or stolen Debt Securities, to maintain an office or agency in
respect of such Debt Securities and to hold moneys for payment in trust)
("defeasance") (Section 1402) or (b) to be released from its obligations with
respect to such Debt Securities under Sections 1004 to 1011, inclusive, of the
Indenture (including the restrictions described under "Certain Covenants") and
its obligations with respect to any other covenant, and any omission to comply
with such obligations shall not constitute a default or an Event of Default with
respect to such Debt Securities ("covenant defeasance") (Section 1403), in
either case upon the irrevocable deposit by the Operating Partnership with the
Trustee, in trust, of an amount, in such currency or currencies, currency unit
or units or composite currency or currencies in which such Debt Securities are
payable at Stated Maturity, or Government Obligations (as defined below), or
both, applicable to such Debt Securities which through the scheduled payment of
principal and interest in accordance with their terms will provide money in an
amount sufficient to pay the principal of (and premium, if any) and interest on
such Debt Securities, and any mandatory sinking fund or analogous payments
thereon, on the scheduled due dates therefor.
 
    Such a trust will only be permitted to be established if, among other
things, the Operating Partnership has delivered to the Trustee an Opinion of
Counsel (as specified in the Indenture) to the effect that the Holders of such
Debt Securities will not recognize income, gain or loss for U.S. federal income
tax purposes as a result of such defeasance or covenant defeasance and will be
subject to U.S. federal income tax on the same amounts, in the same manner and
at the same times as would have been the case if such defeasance or covenant
defeasance had not occurred, and such Opinion of Counsel, in the case of
defeasance, must refer to and be based upon a ruling of the Internal Revenue
Service or a change in applicable United States federal income tax law occurring
after the date of the Indenture (Section 1404).
 
    "Government Obligations" means securities which are (i) direct obligations
of the United States of America or the government which issued the foreign
currency in which the Debt Securities of a particular series are payable, for
the payment of which its full faith and credit is pledged or (ii) obligations of
a person controlled or supervised by and acting as an agency or instrumentality
of the United States of America or such government which issued the foreign
currency in which the Debt Securities of such series are payable, the payment of
which is unconditionally guaranteed as a full faith and credit obligation by the
United States of America or such other government, which, in either case, are
not callable or redeemable at the option of the issuer thereof, and shall also
include a depository receipt issued by a bank or trust company as custodian with
respect to any such Government Obligation or a specific payment of interest on
or principal of any such Government Obligation held by such custodian for the
account of the holder of a depository receipt, PROVIDED that (except as required
by law) such custodian is not authorized to make any deduction from the amount
payable to the holder of such depository receipt from any amount received by the
custodian in respect of the Government Obligation or the specific payment of
interest on or principal of the Government Obligation evidenced by such
depository receipt.
 
    Unless otherwise provided in the applicable Prospectus Supplement, if after
the Operating Partnership has deposited funds and/or Government Obligations to
effect defeasance or covenant defeasance with respect to Debt Securities of any
series, (a) the Holder of a Debt Security of such series is entitled to, and
does, elect pursuant to the Indenture or the terms of such Debt Security to
receive payment in a currency, currency unit or composite currency other than
that in which such deposit has been made in respect of such
 
                                       13
<PAGE>
Debt Security, or (b) a Conversion Event (as defined below) occurs in respect of
the currency, currency unit or composite currency in which such deposit has been
made, the indebtedness represented by such Debt Security shall be deemed to have
been, and will be, fully discharged and satisfied through the payment of the
principal of (and premium, if any) and interest on such Debt Security as they
become due out of the proceeds yielded by converting the amount so deposited in
respect of such Debt Security into the currency, currency unit or composite
currency in which such Debt Security becomes payable as a result of such
election or such Conversion Event based on the applicable market exchange rate.
"Conversion Event" means the cessation of use of (i) a currency, currency unit
or composite currency both by the government of the country which issued such
currency and for the settlement of transactions by a central bank or other
public institutions of or within the international banking community, (ii) the
ECU both within the European Monetary System and for the settlement of
transactions by public institutions of or within the European Community or (iii)
any currency unit or composite currency other than the ECU for the purposes for
which it was established. Unless otherwise provided in the applicable Prospectus
Supplement, all payments of principal of (and premium, if any) and interest on
any Debt Security that is payable in a foreign currency that ceases to be used
by its government of issuance shall be made in U.S. dollars.
 
    In the event the Operating Partnership effects covenant defeasance with
respect to any Debt Securities and such Debt Securities are declared due and
payable because of the occurrence of any Event of Default other than the Event
of Default described in clause (d) under "Events of Default, Notice and Waiver"
with respect to Sections 1004 to 1011, inclusive, of the Indenture (which
sections would no longer be applicable to such Debt Securities) or described in
clause (g) under "Events of Default, Notice and Waiver" with respect to any
other covenant as to which there has been covenant defeasance, the amount in
such currency, currency unit or composite currency in which such Debt Securities
are payable, and Government Obligations on deposit with the Trustee, will be
sufficient to pay amounts due on such Debt Securities at the time of their
Stated Maturity but may not be sufficient to pay amounts due on such Debt
Securities at the time of the acceleration resulting from such Event of Default.
However, the Operating Partnership would remain liable to make payment of such
amounts due at the time of acceleration.
 
    The applicable Prospectus Supplement may further describe the provisions, if
any, permitting such defeasance or covenant defeasance, including any
modifications to the provisions described above, with respect to the Debt
Securities of or within a particular series.
 
NO CONVERSION RIGHTS
 
    The Debt Securities will not be convertible into or exchangeable for any
capital stock of the Company or equity interest in the Operating Partnership.
 
GLOBAL SECURITIES
 
    The Debt Securities of a series may be issued in whole or in part in the
form of one or more global securities (the "Global Securities") that will be
deposited with, or on behalf of, a depositary (the "Depositary") identified in
the applicable Prospectus Supplement relating to such series. Global Securities
may be issued in either registered or bearer form and in either temporary or
permanent form. The specific terms of the depositary arrangement with respect to
a series of Debt Securities will be described in the applicable Prospectus
Supplement relating to such series.
 
                         DESCRIPTION OF PREFERRED STOCK
 
GENERAL
 
    The Company is authorized to issue 5,000,000 shares of preferred stock, $.01
par value per share, of which 300,000 shares of 9.10% Series A Cumulative
Redeemable Preferred Stock and 300,000 shares of 7.99% Series B Cumulative
Step-Up Premium Rate-SM- Preferred Stock were outstanding at December 31, 1997.
 
    The following description of the Preferred Stock sets forth certain general
terms and provisions of the Preferred Stock to which any Prospectus Supplement
may relate. The statements below describing the
 
                                       14
<PAGE>
Preferred Stock are in all respects subject to and qualified in their entirety
by reference to the applicable provisions of the Company's Amended and Restated
Articles of Incorporation (the "Articles of Incorporation") and Bylaws and any
applicable amendment to the Articles of Incorporation designating terms of a
series of Preferred Stock (a "Designating Amendment").
 
TERMS
 
    Subject to the limitations prescribed by the Articles of Incorporation, the
board of directors is authorized to fix the number of shares constituting each
series of Preferred Stock and the designations and powers, preferences and
relative, participating, optional or other special rights and qualifications,
limitations or restrictions thereof, including such provisions as may be desired
concerning voting, redemption, dividends, dissolution or the distribution of
assets, conversion or exchange, and such other subjects or matters as may be
fixed by resolution of the board of directors. The Preferred Stock will, when
issued, be fully paid and nonassessable by the Company (except as described
under "-- Shareholder Liability" below) and will have no preemptive rights.
 
    Reference is made to the Prospectus Supplement relating to the Preferred
Stock offered thereby for specific terms, including:
 
    (1) The title and stated value of such Preferred Stock;
 
    (2) The number of shares of such Preferred Stock offered, the liquidation
        preference per share and the offering price of such Preferred Stock;
 
    (3) The dividend rate(s), period(s) and/or payment date(s) or method(s) of
        calculation thereof applicable to such Preferred Stock;
 
    (4) The date from which dividends on such Preferred Stock shall accumulate,
        if applicable;
 
    (5) The procedures for any auction and remarketing, if any, for such
        Preferred Stock;
 
    (6) The provision for a sinking fund, if any, for such Preferred Stock;
 
    (7) The provision for redemption, if applicable, of such Preferred Stock;
 
    (8) Any listing of such Preferred Stock on any securities exchange;
 
    (9) The terms and conditions, if applicable, upon which such Preferred Stock
        will be convertible into Common Stock of the Company, including the
        conversion price (or manner of calculation thereof);
 
   (10) Whether interests in such Preferred Stock will be represented by
        Depositary Shares;
 
   (11) Any other specific terms, preferences, rights, limitations or
        restrictions of such Preferred Stock;
 
   (12) A discussion of federal income tax considerations applicable to such
        Preferred Stock;
 
   (13) The relative ranking and preferences of such Preferred Stock as to
        dividend rights and rights upon liquidation, dissolution or winding up
        of the affairs of the Company;
 
   (14) Any limitations on issuance of any series of Preferred Stock ranking
        senior to or on a parity with such series of Preferred Stock as to
        dividend rights and rights upon liquidation, dissolution or winding up
        of the affairs of the Company; and
 
   (15) Any limitations on direct or beneficial ownership and restrictions on
        transfer, in each case as may be appropriate to preserve the status of
        the Company as a REIT.
 
RANK
 
    Unless otherwise specified in the Prospectus Supplement, the Preferred Stock
will, with respect to dividend rights and rights upon liquidation, dissolution
or winding up of the Company, rank (i) senior to all classes or series of Common
Stock of the Company, and to all equity securities ranking junior to such
Preferred Stock; (ii) on a parity with all equity securities issued by the
Company the terms of which
 
                                       15
<PAGE>
specifically provide that such equity securities rank on a parity with the
Preferred Stock; and (iii) junior to all equity securities issued by the Company
the terms of which specifically provide that such equity securities rank senior
to the Preferred Stock. The term "equity securities" does not include
convertible debt securities.
 
DIVIDENDS
 
    Holders of the Preferred Stock of each series will be entitled to receive,
when, as and if declared by the board of directors of the Company, out of assets
of the Company legally available for payment, cash dividends at such rates and
on such dates as will be set forth in the applicable Prospectus Supplement. Each
such dividend shall be payable to holders of record as they appear on the share
transfer books of the Company on such record dates as shall be fixed by the
board of directors of the Company.
 
    Dividends on any series of the Preferred Stock may be cumulative or
non-cumulative, as provided in the applicable Prospectus Supplement. Dividends,
if cumulative, will be cumulative from and after the date set forth in the
applicable Prospectus Supplement. If the board of directors of the Company fails
to declare a dividend payable on a dividend payment date on any series of the
Preferred Stock for which dividends are non-cumulative, then the holders of such
series of the Preferred Stock will have no right to receive a dividend in
respect of the dividend period ending on such dividend payment date, and the
Company will have no obligation to pay the dividend accrued for such period,
whether or not dividends on such series are declared payable on any future
dividend payment date.
 
    If Preferred Stock of any series is outstanding, no dividends will be
declared or paid or set apart for payment on any capital stock of the Company of
any other series ranking, as to dividends, on a parity with or junior to the
Preferred Stock of such series for any period unless (i) if such series of
Preferred Stock has a cumulative dividend, full cumulative dividends have been
or contemporaneously are declared and paid or declared and a sum sufficient for
the payment thereof set apart for such payment on the Preferred Stock of such
series for all past dividend periods and the then current dividend period or
(ii) if such series of Preferred Stock does not have a cumulative dividend, full
dividends for the then current dividend period have been or contemporaneously
are declared and paid or declared and a sum sufficient for the payment thereof
set apart for such payment on the Preferred Stock of such series. When dividends
are not paid in full (or a sum sufficient for such full payment is not so set
apart) upon Preferred Stock of any series and the shares of any other series of
Preferred Stock ranking on a parity as to dividends with the Preferred Stock of
such series, all dividends declared upon Preferred Stock of such series and any
other series of Preferred Stock ranking on a parity as to dividends with such
Preferred Stock shall be declared pro rata so that the amount of dividends
declared per share of Preferred Stock of such series and such other series of
Preferred Stock shall in all cases bear to each other the same ratio that
accrued dividends per share on the Preferred Stock of such series (which shall
not include any accumulation in respect of unpaid dividends for prior dividend
periods if such Preferred Stock does not have a cumulative dividend) and such
other series of Preferred Stock bear to each other. No interest, or sum of money
in lieu of interest, shall be payable in respect of any dividend payment or
payments on Preferred Stock of such series which may be in arrears.
 
    Except as provided in the immediately preceding paragraph, unless (i) if
such series of Preferred Stock has a cumulative dividend, full cumulative
dividends on the Preferred Stock of such series 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, and (ii) if such series of Preferred Stock does not have a
cumulative dividend, full dividends on the Preferred Stock of such series have
been or contemporaneously are declared and paid or declared and a sum sufficient
for the payment thereof set apart for payment for the then current dividend
period, no dividends (other than in shares of Common Stock or other capital
shares ranking junior to the Preferred Stock of such series as to dividends and
upon liquidation) shall be declared or paid or set aside for payment or other
distribution shall be declared or made upon the Common Stock, or any other
capital shares of the Company ranking junior to or on a parity with the
Preferred Stock of such series as to dividends or upon liquidation, nor shall
any shares of Common Stock, or any other capital shares of the Company ranking
junior to or on a parity with the Preferred Stock of such series as to dividends
or upon liquidation be redeemed, purchased or otherwise
 
                                       16
<PAGE>
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 capital shares of the Company ranking
junior to the Preferred Stock of such series as to dividends and upon
liquidation).
 
REDEMPTION
 
    If so provided in the applicable Prospectus Supplement, the Preferred Stock
will be subject to mandatory redemption or redemption at the option of the
Company, as a whole or in part, in each case upon the terms, at the times and at
the redemption prices set forth in such Prospectus Supplement.
 
    The Prospectus Supplement relating to a series of Preferred Stock that is
subject to mandatory redemption will specify the number of shares of such
Preferred Stock that shall be redeemed by the Company in each year commencing
after a date to be specified, at a redemption price per share to be specified,
together with an amount equal to all accrued and unpaid dividends thereon (which
shall not, if such Preferred Stock does not have a cumulative dividend, include
any accumulation in respect of unpaid dividends for prior dividend periods) to
the date of redemption. The redemption price may be payable in cash or other
property, as specified in the applicable Prospectus Supplement. If the
redemption price for Preferred Stock of any series is payable only from the net
proceeds of the issuance of capital shares of the Company, the terms of such
Preferred Stock may provide that, if no such capital shares shall have been
issued or to the extent the net proceeds from any issuance are insufficient to
pay in full the aggregate redemption price then due, such Preferred Stock shall
automatically and mandatorily be converted into the applicable capital shares of
the Company pursuant to conversion provisions specified in the applicable
Prospectus Supplement.
 
    Notwithstanding the foregoing, unless (i) if such series of Preferred Stock
has a cumulative dividend, full cumulative dividends on all shares of any series
of Preferred Stock shall 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, and (ii) if such
series of Preferred Stock does not have a cumulative dividend, full dividends of
the Preferred Stock of any series have been or contemporaneously are declared
and paid or declared and a sum sufficient for the payment thereof set apart for
payment for the then current dividend period, no shares of any series of
Preferred Stock shall be redeemed unless all outstanding Preferred Stock of such
series is simultaneously redeemed; PROVIDED, HOWEVER, that the foregoing shall
not prevent the purchase or acquisition of Preferred Stock of such series to
preserve the REIT status of the Company or pursuant to a purchase or exchange
offer made on the same terms to holders of all outstanding Preferred Stock of
such series. In addition, unless (i) if such series of Preferred Stock has a
cumulative dividend, full cumulative dividends on all outstanding shares of any
series of Preferred Stock 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 dividends periods and the then current dividend period, and (ii) if
such series of Preferred Stock does not have a cumulative dividend, full
dividends on the Preferred Stock of any series have been or contemporaneously
are declared and paid or declared and a sum sufficient for the payment thereof
set apart for payment for the then current dividend period, the Company shall
not purchase or otherwise acquire directly or indirectly any shares of Preferred
Stock of such series (except by conversion into or exchange for capital shares
of the Company ranking junior to the Preferred Stock of such series as to
dividends and upon liquidation); PROVIDED, HOWEVER, that the foregoing shall not
prevent the purchase or acquisition of Preferred Stock of such series to
preserve the REIT status of the Company or pursuant to a purchase or exchange
offer made on the same terms to holders of all outstanding Preferred Stock of
such series.
 
    If fewer than all of the outstanding shares of Preferred Stock of any series
are to be redeemed, the number of shares to be redeemed will be determined by
the Company and such shares may be redeemed pro rata from the holders of record
of such shares in proportion to the number of such shares held or for which
redemption is requested by such holder (with adjustments to avoid redemption of
fractional shares) or by lot in a manner determined by the Company.
 
                                       17
<PAGE>
    Notice of redemption will be mailed at least 30 days but not more than 60
days before the redemption date to each holder of record of Preferred Stock of
any series to be redeemed at the address shown on the share transfer books of
the Company. Each notice shall state: (i) the redemption date; (ii) the number
of shares and series of the Preferred Stock to be redeemed; (iii) the redemption
price; (iv) the place or places where certificates for such Preferred Stock are
to be surrendered for payment of the redemption price; (v) that dividends on the
shares to be redeemed will cease to accrue on such redemption date; and (vi) the
date upon which the holder's conversion rights, if any, as to such shares shall
terminate. If fewer than all the shares of Preferred Stock of any series are to
be redeemed, the notice mailed to each such holder thereof shall also specify
the number of shares of Preferred Stock to be redeemed from each such holder. If
notice of redemption of any Preferred Stock has been given and if the funds
necessary for such redemption have been set aside by the Company in trust for
the benefit of the holders of any Preferred Stock so called for redemption, then
from and after the redemption date dividends will cease to accrue on such
Preferred Stock, and all rights of the holders of such shares will terminate,
except the right to receive the redemption price.
 
LIQUIDATION PREFERENCE
 
    Upon any voluntary or involuntary liquidation, dissolution or winding up of
the affairs of the Company, then, before any distribution or payment shall be
made to the holders of any Common Stock or any other class or series of capital
shares of the Company ranking junior to the Preferred Stock in the distribution
of assets upon any liquidation, dissolution or winding up of the Company, the
holders of each series of Preferred Stock shall be entitled to receive out of
assets of the Company legally available for distribution to shareholders
liquidating distributions in the amount of the liquidation preference per share
(set forth in the applicable Prospectus Supplement), plus an amount equal to all
dividends accrued and unpaid thereon (which shall not include any accumulation
in respect of unpaid dividends for prior dividend periods if such Preferred
Stock does not have a cumulative dividend). After payment of the full amount of
the liquidating distributions to which they are entitled, the holders of
Preferred Stock will have no right or claim to any of the remaining assets of
the Company. In the event that, upon any such voluntary or involuntary
liquidation, dissolution or winding up, the available assets of the Company are
insufficient to pay the amount of the liquidating distributions on all
outstanding Preferred Stock and the corresponding amounts payable on all shares
of other classes or series of capital shares of the Company ranking on a parity
with the Preferred Stock in the distribution of assets, then the holders of the
Preferred Stock and all other such classes or series of capital shares shall
share ratably in any such distribution of assets in proportion to the full
liquidating distributions to which they would otherwise be respectively
entitled.
 
    If liquidating distributions shall have been made in full to all holders of
Preferred Stock, the remaining assets of the Company shall be distributed among
the holders of any other classes or series of capital shares ranking junior to
the Preferred Stock upon liquidation, dissolution or winding up, according to
their respective rights and preferences and in each case according to their
respective number of shares. For such purposes, the consolidation or merger of
the Company with or into any other corporation, trust or entity, or the sale,
lease or conveyance of all or substantially all of the property or business of
the Company, shall not be deemed to constitute a liquidation, dissolution or
winding up of the Company.
 
VOTING RIGHTS
 
    Holders of the Preferred Stock will not have any voting rights, except as
set forth below or as otherwise from time to time required by law or as
indicated in the applicable Prospectus Supplement.
 
    Whenever dividends on any shares of Preferred Stock shall be in arrears for
six or more consecutive quarterly periods, the holders of such shares of
Preferred Stock (voting separately as a class with all other series of preferred
stock upon which like voting rights have been conferred and are exercisable)
will be entitled to vote for the election of two additional directors of the
Company at a special meeting called by the holders of record of at least ten
percent (10%) of any series of Preferred stock 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 stockholders) or at the next annual meeting of
stockholders, and at each subsequent annual meeting until (i) if such series of
Preferred Stock has a cumulative dividend, all dividends accumulated on such
shares of
 
                                       18
<PAGE>
Preferred Stock for the past dividend periods and the then current dividend
period shall have been fully paid or declared and a sum sufficient for the
payment thereof set aside for payment or (ii) if such series of Preferred Stock
does not have a cumulative dividend, four consecutive quarterly dividends shall
have been fully paid or declared and a sum sufficient for the payment thereof
set aside for payment. In such case, the entire board of directors of the
Company will be increased by two directors.
 
    Unless provided otherwise for any series of Preferred Stock, so long as any
shares of Preferred Stock remain outstanding, the Company will not, without the
affirmative vote or consent of the holders of at least two-thirds of the shares
of each series of Preferred Stock outstanding at the time, given in person or by
proxy, either in writing or at a meeting (such series voting separately as a
class), (i) authorize or create, or increase the authorized or issued amount of,
any class or series of capital stock ranking prior to such series of Preferred
Stock with respect to payment of dividends or the distribution of assets upon
liquidation, dissolution or winding up or reclassify any authorized capital
stock 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 Company's
Articles of Incorporation or the Designating Amendment for such series of
Preferred Stock, whether by merger, consolidation or otherwise (an "Event"), so
as to materially and adversely affect any right, preference, privilege or voting
power of such series of Preferred Stock or the holders thereof; PROVIDED,
HOWEVER, with respect to the occurrence of any of the Events set forth in (ii)
above, so long as the Preferred Stock remains 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
shall not be deemed to materially and adversely affect such rights, preferences,
privileges or voting power of holders of Preferred Stock and provided further
that (x) any increase in the amount of the authorized Preferred Stock or the
creation or issuance of any other series of Preferred Stock, or (y) any increase
in the amount of authorized shares of such series or any other series of
Preferred Stock, in each case ranking on a parity with or junior to the
Preferred Stock of such series with respect to payment of dividends or the
distribution of assets upon liquidation, dissolution or winding up, shall 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 prior to the time
when the act with respect to which such vote would otherwise be required shall
be effected, all outstanding shares of such series of Preferred Stock shall have
been redeemed or called for redemption and sufficient funds shall have been
deposited in trust to effect such redemption.
 
    Under Indiana law, notwithstanding anything to the contrary set forth above,
holders of each series of Preferred Stock will be entitled to vote as a class
upon any proposed amendment to the Articles of Incorporation, whether or not
entitled to vote thereon by the Articles of Incorporation, if the amendment
would (i) increase or decrease the aggregate number of authorized shares of such
series; (ii) effect an
 
                                       19
<PAGE>
exchange or reclassification of all or part of the shares of the series into
shares of another series; (iii) effect an exchange or reclassification, or
create the right of exchange, of all or part of the shares of another class or
series into shares of the series; (iv) change the designation, rights,
preferences or limitations of all or a part of the shares of the series; (v)
change the shares of all or part of the series into a different number of shares
of the same series; (vi) create a new series having rights or preferences with
respect to distributions or dissolution that are prior, superior or
substantially equal to the shares of the series; (vii) increase the rights,
preferences or number of authorized shares of any class or series that, after
giving effect to the amendment, have rights or preferences with respect to
distributions or to dissolution that are prior, superior or substantially equal
to the shares of the series; (viii) limit or deny an existing preemptive right
of all or part of the shares of the series; or (ix) cancel or otherwise affect
rights to distributions or dividends that have accumulated but have not yet been
declared on all or part of the shares of the series.
 
CONVERSION RIGHTS
 
    The terms and conditions, if any, upon which any series of Preferred Stock
is convertible into shares of Common Stock will be set forth in the applicable
Prospectus Supplement relating thereto. Such terms will include the number of
shares of Common Stock into which the shares of Preferred Stock are convertible,
the conversion price (or manner of calculation thereof), the conversion period,
provisions as to whether conversion will be at the option of the holders of the
Preferred Stock or the Company, the events requiring an adjustment of the
conversion price and provisions affecting conversion in the event of the
redemption of such series of Preferred Stock.
 
SHAREHOLDER LIABILITY
 
    As discussed below under "Description of Common Stock -- General,"
applicable Indiana law provides that no shareholder, including holders of
Preferred Stock, shall be personally liable for the acts and obligations of the
Company and that the funds and property of the Company shall be the only
recourse for such acts or obligations.
 
RESTRICTIONS ON OWNERSHIP
 
    As discussed below under "Description of Common Stock -- Certain Provisions
Affecting Change of Control," for the Company to qualify as a REIT under the
Internal Revenue Code of 1986, as amended (the "Code"), not more than 50% in
value of its outstanding capital shares may be owned, directly or indirectly, by
five or fewer individuals (as defined in the Code to include certain entities)
during the last half of a taxable year. To assist the Company in meeting this
requirement, the Company may take certain actions to limit the beneficial
ownership, directly or indirectly, by a single person of the Company's
outstanding equity securities, including any Preferred Stock of the Company.
Therefore, the Designating Amendment for each series of Preferred Stock may
contain provisions restricting the ownership and transfer of the Preferred
Stock. The applicable Prospectus Supplement will specify any additional
ownership limitation relating to a series of Preferred Stock.
 
REGISTRAR AND TRANSFER AGENT
 
    The Registrar and Transfer Agent for the Preferred Stock will be set forth
in the applicable Prospectus Supplement.
 
                        DESCRIPTION OF DEPOSITARY SHARES
 
GENERAL
 
    The Company may issue receipts ("Depositary Receipts") for Depositary
Shares, each of which will represent a fractional interest of a share of a
particular series of Preferred Stock, as specified in the applicable Prospectus
Supplement. Shares of Preferred Stock of each series represented by Depositary
Shares will be deposited under a separate deposit agreement (each, a "Deposit
Agreement") among the Company, the depositary named therein (a "Preferred Stock
Depositary") and the holders from time to time of the Depositary Receipts.
Subject to the terms of the applicable Deposit Agreement, each owner of a
Depositary Receipt will be entitled, in proportion to the fractional interest of
a share of a particular series of
 
                                       20
<PAGE>
Preferred Stock represented by the Depositary Shares evidenced by such
Depositary Receipt, to all the rights and preferences of the Preferred Stock
represented by such Depositary Shares (including dividend, voting, conversion,
redemption and liquidation rights).
 
    The Depositary Shares will be evidenced by Depositary Receipts issued
pursuant to the applicable Deposit Agreement. Immediately following the issuance
and delivery of the Preferred Stock by the Company to a Preferred Stock
Depositary, the Company will cause such Preferred Stock Depositary to issue, on
behalf of the Company, the Depositary Receipts. Copies of the applicable form of
Deposit Agreement and Depositary Receipt may be obtained from the Company upon
request, and the statements made hereunder relating to Deposit Agreements and
the Depositary Receipts to be issued thereunder are summaries of certain
anticipated provisions thereof and do not purport to be complete and are subject
to, and qualified in their entirety by reference to, all of the provisions of
the applicable Deposit Agreement and related Depositary Receipts.
 
DIVIDENDS AND OTHER DISTRIBUTIONS
 
    A Preferred Stock Depositary will be required to distribute all cash
dividends or other cash distributions received in respect of the applicable
Preferred Stock to the record holders of Depositary Receipts evidencing the
related Depositary Shares in proportion to the number of such Depositary
Receipts owned by such holders, subject to certain obligations of holders to
file proofs, certificates and other information and to pay certain charges and
expenses to such Preferred Stock Depositary.
 
    In the event of a distribution other than in cash, a Preferred Stock
Depositary will be required to distribute property received by it to the record
holders of Depositary Receipts entitled thereto, subject to certain obligations
of holders to file proofs, certificates and other information and to pay certain
charges and expenses to such Preferred Stock Depositary, unless such Preferred
Stock Depositary determines that it is not feasible to make such distribution,
in which case such Preferred Stock Depositary may, with the approval of the
Company, sell such property and distribute the net proceeds from such sale to
such holders.
 
    No distribution will be made in respect of any Depositary Share to the
extent that it represents any Preferred Stock which has been converted or
exchanged.
 
WITHDRAWAL OF STOCK
 
    Upon surrender of the Depositary Receipts at the corporate trust office of
the applicable Preferred Stock Depositary (unless the related Depositary Shares
have previously been called for redemption or converted), the holders thereof
will be entitled to delivery at such office, to or upon each such holder's
order, of the number of whole or fractional shares of the applicable Preferred
Stock and any money or other property represented by the Depositary Shares
evidenced by such Depositary Receipts. Holders of Depositary Receipts will be
entitled to receive whole or fractional shares of the related Preferred Stock on
the basis of the proportion of Preferred Stock represented by each Depositary
Share as specified in the applicable Prospectus Supplement, but holders of such
shares of Preferred Stock will not thereafter be entitled to receive Depositary
Shares therefor. If the Depositary Receipts delivered by the holder evidence a
number of Depositary Shares in excess of the number of Depositary Shares
representing the number of shares of Preferred Stock to be withdrawn, the
applicable Preferred Stock Depositary will be required to deliver to such holder
at the same time a new Depositary Receipt evidencing such excess number of
Depositary Shares.
 
REDEMPTION OF DEPOSITARY SHARES
 
    Whenever the Company redeems shares of Preferred Stock held by a Preferred
Stock Depositary, such Preferred Stock Depositary will be required to redeem as
of the same redemption date the number of Depositary Shares representing shares
of the Preferred Stock so redeemed, provided the Company shall have paid in full
to such Preferred Stock Depositary the redemption price of the Preferred Stock
to be redeemed plus an amount equal to any accrued and unpaid dividends thereon
to the date fixed for redemption. The redemption price per Depositary Share will
be equal to the redemption price and any other amounts per share payable with
respect to the Preferred Stock. If fewer than all the Depositary Shares are to
 
                                       21
<PAGE>
be redeemed, the Depositary Shares to be redeemed will be selected pro rata (as
nearly as may be practicable without creating fractional Depositary Shares) or
by any other equitable method determined by the Company that preserves the REIT
status of the Company.
 
    From and after the date fixed for redemption, all dividends in respect of
the shares of Preferred Stock so called for redemption will cease to accrue, the
Depositary Shares so called for redemption will no longer be deemed to be
outstanding and all rights of the holders of the Depositary Receipts evidencing
the Depositary Shares so called for redemption will cease, except the right to
receive any moneys payable upon such redemption and any money or other property
to which the holders of such Depositary Receipts were entitled upon such
redemption upon surrender thereof to the applicable Preferred Stock Depositary.
 
VOTING OF THE PREFERRED STOCK
 
    Upon receipt of notice of any meeting at which the holders of the applicable
Preferred Stock are entitled to vote, a Preferred Stock Depositary will be
required to mail the information contained in such notice of meeting to the
record holders of the Depositary Receipts evidencing the Depositary Shares which
represent such Preferred Stock. Each record holder of Depositary Receipts
evidencing Depositary Shares on the record date (which will be the same date as
the record date for the Preferred Stock) will be entitled to instruct such
Preferred Stock Depositary as to the exercise of the voting rights pertaining to
the amount of Preferred Stock represented by such holder's Depositary Shares.
Such Preferred Stock Depositary will be required to vote the amount of Preferred
Stock represented by such Depositary Shares in accordance with such
instructions, and the Company will agree to take all reasonable action which may
be deemed necessary by such Preferred Stock Depositary in order to enable such
Preferred Stock Depositary to do so. Such Preferred Stock Depositary will be
required to abstain from voting the amount of Preferred Stock represented by
such Depositary Shares to the extent it does not receive specific instructions
from the holders of Depositary Receipts evidencing such Depositary Shares. A
Preferred Stock Depositary will not be responsible for any failure to carry out
any instruction to vote, or for the manner or effect of any such vote made, as
long as any such action or non-action is in good faith and does not result from
negligence or willful misconduct of such Preferred Stock Depositary.
 
LIQUIDATION PREFERENCE
 
    In the event of the liquidation, dissolution or winding up of the Company,
whether voluntary or involuntary, the holders of each Depositary Receipt will be
entitled to the fraction of the liquidation preference accorded each share of
Preferred Stock represented by the Depositary Share evidenced by such Depositary
Receipt, as set forth in the applicable Prospectus Supplement.
 
CONVERSION OF PREFERRED STOCK
 
    The Depositary Shares, as such, will not be convertible into Common Stock or
any other securities or property of the Company. Nevertheless, if so specified
in the applicable Prospectus Supplement relating to an offering of Depositary
Shares, the Depositary Receipts may be surrendered by holders thereof to the
applicable Preferred Stock Depositary with written instructions to such
Preferred Stock Depositary to instruct the Company to cause conversion of the
Preferred Stock represented by the Depositary Shares evidenced by such
Depositary Receipts into whole shares of Common Stock, other shares of Preferred
Stock of the Company or other shares of stock, and the Company will agree that
upon receipt of such instructions and any amounts payable in respect thereof, it
will cause the conversion thereof utilizing the same procedures as those
provided for delivery of Preferred Stock to effect such conversion. If the
Depositary Shares evidenced by a Depositary Receipt are to be converted in part
only, a new Depositary Receipt or Receipts will be issued for any Depositary
Shares not to be converted. No fractional shares of Common Stock will be issued
upon conversion, and if such conversion will result in a fractional share being
issued, an amount will be paid in cash by the Company equal to the value of the
fractional interest based upon the closing price of the Common Stock on the last
business day prior to the conversion.
 
                                       22
<PAGE>
AMENDMENT AND TERMINATION OF A DEPOSIT AGREEMENT
 
    Any form of Depositary Receipt evidencing Depositary Shares which will
represent Preferred Stock and any provision of a Deposit Agreement will be
permitted at any time to be amended by agreement between the Company and the
applicable Preferred Stock Depositary. However, any amendment that materially
and adversely alters the rights of the holders of Depositary Receipts or that
would be materially and adversely inconsistent with the rights granted to the
holders of the related Preferred Stock will not be effective unless such
amendment has been approved by the existing holders of at least two-thirds of
the applicable Depositary Shares evidenced by the applicable Depositary Receipts
then outstanding. No amendment shall impair the right, subject to certain
anticipated exceptions in the Deposit Agreements, of any holder of Depositary
Receipts to surrender any Depositary Receipt with instructions to deliver to the
holder the related Preferred Stock and all money and other property, if any,
represented thereby, except in order to comply with law. Every holder of an
outstanding Depositary Receipt at the time any such amendment becomes effective
shall be deemed, by continuing to hold such Depositary Receipt, to consent and
agree to such amendment and to be bound by the applicable Deposit Agreement as
amended thereby.
 
    A Deposit Agreement will be permitted to be terminated by the Company upon
not less than 30 days' prior written notice to the applicable Preferred Stock
Depositary if (i) such termination is necessary to preserve the Company's status
as a REIT or (ii) a majority of each series of Preferred Stock affected by such
termination consents to such termination, whereupon such Preferred Stock
Depositary will be required to deliver or make available to each holder of
Depositary Receipts, upon surrender of the Depositary Receipts held by such
holder, such number of whole or fractional shares of Preferred Stock as are
represented by the Depositary Shares evidenced by such Depositary Receipts
together with any other property held by such Preferred Stock Depositary with
respect to such Depositary Receipts. The Company will agree that if a Deposit
Agreement is terminated to preserve the Company's status as a REIT, then the
Company will use its best efforts to list the Preferred Stock issued upon
surrender of the related Depositary Shares on a national securities exchange. In
addition, a Deposit Agreement will automatically terminate if (i) all
outstanding Depositary Shares thereunder shall have been redeemed, (ii) there
shall have been a final distribution in respect of the related Preferred Stock
in connection with any liquidation, dissolution or winding up of the Company and
such distribution shall have been distributed to the holders of Depositary
Receipts evidencing the Depositary Shares representing such Preferred Stock or
(iii) each share of the related Preferred Stock shall have been converted into
stock of the Company not so represented by Depositary Shares.
 
CHARGES OF A PREFERRED STOCK DEPOSITARY
 
    The Company will pay all transfer and other taxes and governmental charges
arising solely from the existence of a Deposit Agreement. In addition, the
Company will pay the fees and expenses of a Preferred Stock Depositary in
connection with the performance of its duties under a Deposit Agreement.
However, holders of Depositary Receipts will pay the fees and expenses of a
Preferred Stock Depositary for any duties requested by such holders to be
performed which are outside of those expressly provided for in the applicable
Deposit Agreement.
 
RESIGNATION AND REMOVAL OF DEPOSITARY
 
    A Preferred Stock Depositary will be permitted to resign at any time by
delivering to the Company notice of its election to do so, and the Company will
be permitted at any time to remove a Preferred Stock Depositary, any such
resignation or removal to take effect upon the appointment of a successor
Preferred Stock Depositary. A successor Preferred Stock Depositary will be
required to be appointed within 60 days after delivery of the notice of
resignation or removal and will be required to be a bank or trust company having
its principal office in the United States and having a combined capital and
surplus of at least $50,000,000.
 
                                       23
<PAGE>
MISCELLANEOUS
 
    A Preferred Stock Depositary will be required to forward to holders of
Depositary Receipts any reports and communications from the Company which are
received by such Preferred Stock Depositary with respect to the related
Preferred Stock.
 
    Neither a Preferred Stock Depositary nor the Company will be liable if it is
prevented from or delayed in, by law or any circumstances beyond its control,
performing its obligations under a Deposit Agreement. The obligations of the
Company and a Preferred Stock Depositary under a Deposit Agreement will be
limited to performing their duties thereunder in good faith and without
negligence (in the case of any action or inaction in the voting of Preferred
Stock represented by the applicable Depositary Shares), gross negligence or
willful misconduct, and neither the Company nor any applicable Preferred Stock
Depositary will be obligated to prosecute or defend any legal proceeding in
respect of any Depositary Receipts. Depositary Shares or shares of Preferred
Stock represented thereby unless satisfactory indemnity is furnished. The
Company and any Preferred Stock Depositary will be permitted to rely on written
advice of counsel or accountants, or information provided by persons presenting
shares of Preferred Stock represented thereby for deposit, holders of Depositary
Receipts or other persons believed in good faith to be competent to give such
information, and on documents believed in good faith to be genuine and signed by
a proper party.
 
    In the event a Preferred Stock Depositary shall receive conflicting claims,
requests or instructions from any holders of Depositary Receipts, on the one
hand, and the Company, on the other hand, such Preferred Stock Depositary shall
be entitled to act on such claims, requests or instructions received from the
Company.
 
                          DESCRIPTION OF COMMON STOCK
 
GENERAL
 
    The authorized capital stock of the Company includes 150,000,000 shares of
Common Stock, $.01 par value per share. Each outstanding share of Common Stock
entitles the holder to one vote on all matters presented to shareholders for a
vote. Holders of Common Stock have no preemptive rights. At December 31, 1997,
there were 76,065,207 shares of Common Stock outstanding, 10,988,469 shares
reserved for issuance upon exchange of outstanding Units and 1,927,380 shares
reserved for issuance upon the exercise of outstanding stock options.
 
    Shares of Common Stock currently outstanding are listed for trading on the
New York Stock Exchange (the "NYSE"). The Company will apply to the NYSE to list
the additional shares of Common Stock to be sold pursuant to any Prospectus
Supplement, and the Company anticipates that such shares will be so listed.
 
    The Articles of Incorporation of the Company provide for the board of
directors to be divided into three classes of directors, each class to consist
as nearly as possible of one-third of the directors. At each annual meeting of
shareholders, the class of directors to be elected at such meeting will be
elected for a three-year term and the directors in the other two classes will
continue in office. The overall effect of the provisions in the Articles of
Incorporation with respect to the classified board may be to render more
difficult a change of control of the Company or removal of incumbent management.
Holders of Common Stock have no right to cumulative voting for the election of
directors. Consequently, at each annual meeting of shareholders, the holders of
a plurality of the shares of Common Stock are able to elect all of the
successors of the class of directors whose term expires at that meeting.
Directors may be removed only for cause and only with the affirmative vote of
the holders of a majority of the shares of Common Stock entitled to vote in the
election of directors.
 
    All shares of Common Stock issued will be duly authorized, fully paid, and
non-assessable. Distributions may be paid to the holders of Common Stock if and
when declared by the board of directors of the Company out of funds legally
available therefor. The Company intends to continue to pay quarterly dividends.
 
                                       24
<PAGE>
    Under Indiana law, shareholders are generally not liable for the Company's
debts or obligations. If the Company is liquidated, subject to the right of any
holders of preferred stock, if any, to receive preferential distributions, each
outstanding share of Common Stock will be entitled to participate pro rata in
the assets remaining after payment of, or adequate provision for, all known
debts and liabilities of the Company.
 
CERTAIN PROVISIONS AFFECTING CHANGE OF CONTROL
 
    GENERAL.  Pursuant to Indiana law, the Company cannot merge with or sell all
or substantially all of the assets of the Company, except pursuant to a
resolution approved by shareholders holding a majority of the shares voting on
the resolution. The Company's Articles of Incorporation also contain provisions
which may discourage certain types of transactions involving an actual or
threatened change of control of the Company, including: (i) a requirement that,
in the case of certain mergers, sales of assets, liquidations or dissolutions,
or reclassifications or recapitalizations involving persons owning 10% or more
of the capital stock of the Company, such transactions be approved by a vote of
the holders of 80% of the issued and outstanding shares of capital stock of the
Company or three-fourths of the continuing directors, or provide for payment of
a price to affected shareholders for their shares not less than as specified in
the Articles of Incorporation; (ii) a requirement that any amendment or
alteration of certain provisions of the Articles of Incorporation affecting
change of control be approved by the holders of 80% of the issued and
outstanding capital stock of the Company; and (iii) a staggered board of
directors and a limitation on removal of directors to removal for cause as
described above.
 
    The partnership agreement for the Operating Partnership also contains
provisions which could discourage transactions involving an actual or threatened
change of control of the Company, including (i) a requirement that holders of at
least 90% of the outstanding Units held by the Company and other Unit holders
approve any voluntary sale, exchange or other disposition, including merger or
consolidation (other than a disposition occurring upon a financing or
refinancing of the Operating Partnership), of all or substantially all of the
assets of the Operating Partnership in a single transaction or a series of
related transactions; (ii) a restriction against any assignment or transfer by
the Company of its interest in the Operating Partnership; and (iii) a
requirement that holders of more than 90% of the Units approve any merger,
consolidation or other combination of the Company with or into another entity,
or sale of all or substantially all of the Company's assets, or any
reclassification or recapitalization or change of outstanding shares of Common
Stock (other than certain changes in par value, stock splits, stock dividends or
combinations) unless after the transaction substantially all of the assets of
the surviving entity are contributed to the Operating Partnership in exchange
for Units. On these matters, the Company's Units will be voted at the discretion
of the directors of the Company who are not officers or employees of the Company
and do not hold Units.
 
    OWNERSHIP LIMITS.  For the Company to qualify as a REIT under the Code, no
more than 50% in value of its outstanding capital shares may be owned, directly
or indirectly, by five or fewer individuals (as defined in the Code to include
certain entities) during the last half of a taxable year or during a
proportionate part of a shorter taxable year. The Common Stock must also be
beneficially owned by 100 or more persons during at least 335 days of a taxable
year or during a proportionate part of a shorter taxable year. Because the
Company expects to continue to qualify as a REIT, the Articles of Incorporation
of the Company contain restrictions on the acquisition of Common Stock intended
to ensure compliance with these requirements.
 
    The Articles of Incorporation contain a restriction which authorizes, but
does not require, the board of directors to refuse to give effect to a transfer
of Common Stock which, in its opinion, might jeopardize the status of the
Company as a REIT. This provision also renders null and void any purported
acquisition of shares which would result in the disqualification of the Company
as a REIT. The provision also gives the board of directors the authority to take
such actions as it deems advisable to enforce the provision. Such actions might
include, but are not limited to, refusing to give effect to, or seeking to
enjoin, a transfer which might jeopardize the Company's status as a REIT. The
provision also requires any shareholder to provide the Company such information
regarding his direct and indirect ownership of Common Stock as the Company may
reasonably require.
 
                                       25
<PAGE>
REGISTRAR AND TRANSFER AGENT
 
    The Registrar and Transfer Agent for the Common Stock is American Stock
Transfer & Trust Company, New York, New York.
 
                       FEDERAL INCOME TAX CONSIDERATIONS
 
    The following summary of material federal income tax considerations relevant
to the Company is based on current law, is not exhaustive of all possible tax
considerations, does not include a detailed discussion of any state, local or
foreign tax considerations and does not purport to deal with all aspects of
taxation that may be relevant to an investor in light of his or her particular
circumstances or to certain types of investors (including insurance companies,
tax-exempt entities, financial institutions or broker-dealers, foreign
corporations and persons who are not citizens or residents of the United States)
who are subject to special treatment under the federal income tax laws. The tax
treatment of an investor will also vary depending upon the terms of the specific
securities acquired by such investor. Additional federal income tax
considerations that are material to investors in securities other than common
stock may be provided in the applicable Prospectus Supplement relating thereto.
 
    EACH PROSPECTIVE PURCHASER IS ADVISED TO CONSULT THE APPLICABLE PROSPECTUS
SUPPLEMENT AS WELL AS HIS OR HER OWN TAX ADVISOR REGARDING THE SPECIFIC TAX
CONSEQUENCES TO HIM OR HER OF THE PURCHASE, OWNERSHIP AND SALE OF SECURITIES IN
AN ENTITY ELECTING TO BE TAXED AS A REIT, INCLUDING THE FEDERAL, STATE, LOCAL,
FOREIGN AND OTHER TAX CONSEQUENCES OF SUCH PURCHASE, OWNERSHIP, SALE AND
ELECTION, AND OF POTENTIAL CHANGES IN APPLICABLE TAX LAWS.
 
TAXATION OF THE COMPANY
 
    GENERAL.  The Company expects to continue to be taxed as a REIT for Federal
income tax purposes. Management believes that the Company was organized and has
operated in such a manner as to meet the requirements for qualification and
taxation as a REIT under the Internal Revenue Code of 1986, as amended (the
"Code"), and that the Company intends to continue to operate in such a manner.
No assurance, however, can be given that the Company has qualified as a REIT or
will continue to operate in a manner so as to remain qualified as a REIT.
 
    In the opinion of Bose McKinney & Evans which has acted as counsel to the
Company ("Counsel"), assuming the Company was organized in conformity with and
has satisfied the requirements for qualification and taxation as a REIT under
the Code for each of its taxable years from and including the first year for
which the Company made the election to be taxed as a REIT, and the assumptions
and representations referred to below are true, the proposed methods of
operation of the Company, the Operating Partnership and Duke Realty Services
Limited Partnership (the "Services Partnership") will permit the Company to
continue to qualify to be taxed as a REIT for its current and subsequent taxable
years. This opinion is based upon certain assumptions relating to the
organization and operation of Duke Services, Inc. ("DSI"), the Operating
Partnership and the Services Partnership and is conditioned upon certain
representations made by Company personnel and affiliates as to certain factual
matters relating to the Company's past operations and the intended manner of
future operation of the Company, the Operating Partnership, and the Services
Partnership. The opinion is further based upon a letter ruling received by the
Company from the IRS dated September 30, 1994, which concluded that the
Company's and the Operating Partnership's distributive shares of the gross
income of the Services Partnership will be in proportion to their respective
percentage shares of the capital interests of the partners of the Services
Partnership. Counsel is not aware of any facts or circumstances which are
inconsistent with these assumptions and representations. Unlike a tax ruling, an
opinion of counsel is not binding upon the IRS, and no assurance can be given
that the IRS will not challenge the status of the Company as a REIT for Federal
income tax purposes. The Company's qualification and taxation as a REIT has
depended and will depend upon, among other things, the Company's ability to meet
 
                                       26
<PAGE>
on a continuing basis, through ownership of assets, actual annual operating
results, receipt of qualifying real estate income, distribution levels and
diversity of stock ownership, the various qualification tests imposed under the
Code discussed below. Counsel will not review compliance with these tests on a
periodic or continuing basis. Accordingly, no assurance can be given respecting
the satisfaction of such tests. See "Taxation of the Company--Failure to
Qualify."
 
    The following is a general summary of the Code sections which govern the
Federal income tax treatment of a REIT and its shareholders. These sections of
the Code are highly technical and complex. This summary is qualified in its
entirety by the applicable Code provisions, Treasury Regulations, and
administrative and judicial interpretations thereof as currently in effect.
 
    So long as the Company qualifies for taxation as a REIT and distributes at
least 95% of its REIT taxable income (computed without regard to net capital
gain or the dividends paid deduction) for its taxable year to its shareholders,
it will generally not be subject to federal income tax with respect to income
which it distributes to its shareholders. However, the Company may be subject to
federal income tax under certain circumstances, including taxes at regular
corporate rates on any undistributed REIT taxable income, the "alternative
minimum tax" on its items of tax preference, and taxes imposed on income and
gain generated by certain extraordinary transactions.
 
    REQUIREMENT FOR QUALIFICATION.  The Code defines a REIT as a corporation,
trust or association: (1) which is managed by one or more trustees or directors;
(2) the beneficial ownership of which is evidenced by transferable shares or by
transferable certificates of beneficial interest; (3) which would be taxable as
a domestic corporation but for Sections 856 through 859 of the Code; (4) which
is neither a financial institution nor an insurance company subject to certain
provisions of the Code; (5) which has the calendar year as its taxable year; (6)
the beneficial ownership of which is held by 100 or more persons; (7) during the
last half of each taxable year not more than 50% in value of the outstanding
stock of which is owned, directly or indirectly, by five or fewer individuals
(as defined in the Code to include certain entities); and (8) which meets
certain income and asset tests, described below. The Company believes it
currently satisfies all requirements.
 
    DSI is a "qualified REIT subsidiary" and is not treated as a separate
corporation. Thus, in applying the requirements described herein, DSI will be
ignored for federal income tax purposes, and all of its assets, liabilities, and
items of income, deduction, and credit will be treated as assets, liabilities,
and items of income, deduction, and credit of the Company. DSI, therefore, will
not be subject to federal corporate income taxation, although it may be subject
to state and local taxation.
 
    INCOME TESTS.  In order to qualify as a REIT, there are two gross income
tests that must be satisfied annually. For purposes of these tests, the Company
is deemed to be entitled to a share of the gross income attributable to its
proportionate interest in any partnerships in which it holds an interest. 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 to real property (including "rents from
real property," gain from the sale of real property and, in certain
circumstances, interest) or from qualified 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 the same
items which qualify under the 75% income tests or from dividends, interest and
gain from the sale or disposition of stock or securities, or from any
combination of the foregoing.
 
    Rents received by the Company will qualify as "rents from real property" in
satisfying the gross income tests for a REIT described above only if several
conditions (related to the relationship of the tenant to the Company, the method
of determining the rent payable and nature of the property leased) are met. The
Company does not anticipate receiving rents in excess of a de minimis amount
that fail to meet these conditions. 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 tenants, other than through an
"independent contractor" that is adequately compensated and from whom the
Company derives no income;
 
                                       27
<PAGE>
provided, however, that the Company may perform services "usually or customarily
rendered" in connection with the rental of space for occupancy only and not
otherwise considered "rendered to the occupant" ("Permissible Services").
 
    The Company provides certain management, development, construction and other
tenant-related services (collectively, "Real Estate Services") with respect to
the Properties through the Operating Partnership, which is not an independent
contractor. Management believes that the Real Estate Services provided to
tenants by the Operating Partnership are Permissible Services. To the extent
Real Estate Services to tenants do not constitute Permissible Services, such
services are performed by independent contractors.
 
    Under the Taxpayer Relief Act of 1997 (the "1997 Act"), in determining
whether a REIT satisfies the income tests, a REIT's rental income from a
property will not cease to qualify as "rents from real property" merely because
the REIT performs services for a tenant other than permitted customary services
if the amount that the REIT is deemed to have received as a result of performing
impermissible services does not exceed one percent of all amounts received
directly or indirectly by the REIT with respect to such property. The amount
that a REIT will be deemed to have received for performing impermissible
services is at least 150% of the direct cost to the REIT of providing those
services.
 
    The Company derives a portion of its income from the Operating Partnership's
interest as a limited partner in the Services Partnership and its ownership of
DSI which is a general partner of the Services Partnership. The Services
Partnership receives fees for Real Estate Services with respect to properties
that are not owned by the Operating Partnership and fees in consideration for
the performance of management and administrative services with respect to
Properties that are not entirely owned by the Operating Partnership. All or a
portion of such fees will not qualify as "rents from real property" for purposes
of the 75% or 95% gross income tests. Pursuant to Treasury Regulations, a
partner's capital interest in a partnership determines its proportionate
interest in the partnership's gross income from partnership assets for purposes
of the 75% and 95% gross income tests. For this purpose, the capital interest of
a partner is determined by dividing its capital account by the sum of all
partners' capital accounts. The partnership agreement of the Services
Partnership provides, however, for varying allocations of income which differ
from capital interests, subject to certain limitations on the aggregate amount
of gross income which may be allocated to the Operating Partnership and DSI. The
Company has obtained a letter ruling from the IRS that allocations according to
capital interests are proper for applying the 75% and 95% gross income tests.
Thus, for purposes of these gross income tests, the Services Partnership
allocates its gross income to the Operating Partnership and DSI based on their
capital interests in the Services Partnership. Although certain of the fees
allocated from the Services Partnership do not qualify under the 75% or 95%
gross income tests as "rents from real property," the Company believes that the
aggregate amount of such fees (and any other non-qualifying income) allocated to
the Company in any taxable year has not and will not cause the Company to exceed
the limits on non-qualifying income under the 75% or 95% gross income tests
described above.
 
    If the Company fails to satisfy one or both of the 75% or 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. It is not
possible, however, to state whether in all circumstances the Company would be
entitled to the benefit of these relief provisions. Even if these relief
provisions apply, a tax would be imposed on certain excess net income.
 
    ASSET TESTS.  In order for the Company to maintain its qualification as a
REIT, at the close of each quarter of its taxable year, it 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,"
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% assets class. Third, of the assets held in securities other than those in
the 75% assets 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 (excluding securities of a qualified REIT subsidiary as defined in
the Code or another REIT).
 
                                       28
<PAGE>
    The Company is deemed to directly hold its proportionate share of all real
estate and other assets of the Operating Partnership as well as its
proportionate share of all assets deemed owned by the Operating Partnership and
DSI through their ownership of partnership interests in the Services Partnership
and other partnerships. As a result, management believes that more than 75% of
the company's assets are real estate assets. In addition, management does not
expect the Company to hold (1) any securities representing more than 10% of any
one issuer's voting securities other than DSI, which is a qualified REIT
subsidiary, nor (2) securities of any one issuer exceeding 5% of the value of
the Company's gross assets (determined in accordance with generally accepted
accounting principles).
 
    ANNUAL DISTRIBUTION REQUIREMENTS.  The Company, in order to qualify as a
REIT, generally must distribute dividends (other than capital gain dividends) to
its shareholders in an amount at least equal to (A) the sum of (i) 95% of the
Company's "REIT taxable income" (computed without regard to the dividends paid
deduction and the Company's net capital gain), and (ii) 95% of the net income
(after tax) if any, from foreclosure property, minus (B) the sum of certain
items of non-cash income. 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 amount at regular capital gains and ordinary corporate tax rates.
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 net capital gain income for such year, and (iii) any undistributed
taxable income from prior periods, the Company will be subject to regular
capital gains and ordinary corporate tax rates on undistributed income and also
may be subject to a 4% excise tax on undistributed income in certain events.
Under the 1997 Act, certain non-cash income, including income from cancellation
of indebtedness and original issue discount, will be excluded from income in
determining the amount of dividends that a REIT is required to distribute. In
addition, a REIT may elect to retain and pay income tax on any net long-term
capital gains and require its shareholders to include such undistributed net
capital gains in their income. If a REIT made such an election, the REIT's
shareholders would receive a tax credit attributable to their share of capital
gains tax paid by the REIT on the undistributed net capital gain that was
included in the shareholders' income, and such shareholders would receive an
increase in the basis of their shares in the amount of undistributed net capital
gain included in their income reduced by the amount of the credit. The Company
believes that it has made and intends to continue to make timely distributions
sufficient to satisfy the annual distribution requirements. In this regard, the
partnership agreement of the Operating Partnership authorizes the Company, as
general partner, to take such steps as may be necessary to cause the Operating
Partnership to distribute to its partners an amount sufficient to permit the
Company to meet these distribution requirements. 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 primarily to the expenditure
of cash for nondeductible expenses such as principal amortization or capital
expenditures. In such event, the Company may borrow or may cause the Operating
Partnership to arrange for short-term or other borrowing to permit the payment
of required dividends or pay dividends in the form of taxable stock dividends.
If the amount of nondeductible expenses exceeds non-cash deductions, the
Operating Partnership may refinance its indebtedness to reduce principal
payments and borrow funds for capital expenditures.
 
    FAILURE TO QUALIFY.  If the Company fails to qualify for taxation as a REIT
in any taxable year, the Company will be subject to tax (including any
applicable corporate alternative minimum tax) on its taxable income at regular
corporate rates. Distributions to shareholders in any year in which the Company
fails to qualify will not be required to be made and, if made, will not be
deductible by the Company. Unless entitled to relief under specific statutory
provisions, the Company also will be disqualified from taxation as a REIT for
the four taxable years following the year during which qualification was lost.
It is not possible to state whether in all circumstances the Company would be
entitled to such statutory relief. The 1997 Act contains a number of technical
provisions that reduce the risk that a REIT will inadvertently cease to qualify
as a REIT.
 
                                       29
<PAGE>
TAX ASPECTS OF THE COMPANY'S INVESTMENTS IN PARTNERSHIPS
 
    EFFECT OF TAX STATUS OF OPERATING PARTNERSHIP AND SERVICES PARTNERSHIP AND
OTHER PARTNERSHIPS ON REIT QUALIFICATION.  All of the Company's investments are
through DSI and the Operating Partnership, which in turn hold interests in other
partnerships, including the Services Partnership. The Company believes that the
Operating Partnership, and each other partnership in which it holds an interest,
is properly treated as a partnership for tax purposes (and not as an association
taxable as a corporation). If, however, the Operating Partnership, the Services
Partnership or any of the other partnerships were treated as an association
taxable as a corporation, the Company would cease to qualify as a REIT.
 
    TAX ALLOCATIONS WITH RESPECT TO THE PROPERTIES.  The Operating Partnership
was formed by way of contributions of appreciated property (including certain of
the Properties) to the Operating Partnership. When property is contributed to a
partnership in exchange for an interest in the partnership, the partnership
generally takes a carryover basis in that property for tax purposes equal to the
adjusted basis of the contributing partner in the property, rather than a basis
equal to the fair market value of the property at the time of contribution (this
difference is referred to as "Book-Tax Difference"). The partnership agreement
of the Operating Partnership requires allocations of income, gain, loss and
deduction with respect to a contributed Property be made in a manner consistent
with the special rules of Section 704(c) of the Code and the regulations
thereunder, which will tend to eliminate the Book-Tax Differences with respect
to the contributed Properties over the life of the Operating Partnership.
However, because of certain technical limitations, the special allocation rules
of Section 704(c) may not always entirely eliminate the Book-Tax Differences on
an annual basis or with respect to a specific taxable transaction such as a
sale. Thus, the carryover basis of the contributed Properties in the hands of
the Operating Partnership could cause the Company (i) to be allocated lower
amounts of depreciation and other deductions for tax purposes than would be
allocated to the Company if all Properties were to have a tax basis equal to
their fair market value at the time of contribution, and (ii) possibly to be
allocated taxable gain in the event of a sale of such contributed Properties in
excess of the economic or book income allocated to the Company as a result of
such sale. The foregoing principles also apply in determining the earnings and
profits of the Company for purposes of determining the portion of distributions
taxable as dividend income. The application of these rules over time may result
in a higher portion of distributions being taxed as dividends than would have
occurred had the Company purchased its interests in the Properties at their
agreed values.
 
TAXATION OF TAXABLE DOMESTIC SHAREHOLDERS
 
    As long as the Company qualifies as a REIT, distributions made to the
Company's taxable domestic shareholders out of current or accumulated earnings
and profits (and not designated as capital gain dividends) will be taken into
account by them as ordinary income and will not be eligible for the dividends
received deduction for corporations. Distributions that are designated as
capital gain dividends will be taxed as long-term capital gains (to the extent
they do not exceed the Company's actual net capital gain for the taxable year).
However, corporate holders may be required to treat up to 20% of certain capital
gain dividends as ordinary income. Distributions in excess of current and
accumulated earnings and profits will not be taxable to a holder to the extent
that they do not exceed the adjusted tax basis of the holder's shares, but
rather will reduce the adjusted basis of such shares. To the extent that such
distributions exceed the adjusted basis of a holder's shares they will be
included in income as long-term capital gain (or short-term capital gain if the
shares have been held for one year or less) assuming the shares are a capital
asset in the hands of the holder. In addition, any dividend declared by the
Company in October, November or December of any year payable to a shareholder of
record on a specified date in any such month shall be treated as both paid by
the Company and received by the shareholder on December 31 of such year;
provided that the dividend is actually paid by the Company during January of the
following calendar year. Shareholders may not include in their individual income
tax returns any net operating losses or capital losses of the Company.
 
    In general, a domestic shareholder will realize capital gain or loss on the
disposition of common stock equal to the difference between (i) the amount of
cash and the fair market value of any property received on such disposition and
(ii) the shareholder's adjusted basis of such common stock. Under the 1997 Act,
for
 
                                       30
<PAGE>
gains realized after July 28, 1997, and subject to certain exceptions, the
maximum rate of tax on net capital gains of individuals, trusts and estates from
the sale or exchange of assets held for more than 18 months has been reduced to
20%, and the maximum rate is reduced to 18% for assets acquired after December
31, 2000 and held for more than five years. For taxpayers who would be subject
to a maximum tax rate of 15%, the rate on net capital gains is reduced to 10%,
and effective for taxable years commencing after December 31, 2000, the rate is
reduced to 8% for assets held for more than five years. The maximum rate for net
capital gains attributable to the sale of depreciable real property held for
more than 18 months is 25% to the extent of the deductions for depreciation with
respect to such property. Long-term capital gain allocated to a shareholder by
the Company will be subject to the 25% rate to the extent that the gain does not
exceed depreciation on real property sold by the Company. The maximum rate of
capital gains tax for capital assets held more than one year but not more than
18 months remains at 28%. The taxation of capital gains of corporations was not
changed by the 1997 Act. Loss upon a sale or exchange of common stock by a
shareholder who has held such common stock 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 from the Company required to be treated by
such shareholder as long-term capital gain.
 
TAXATION OF TAX-EXEMPT SHAREHOLDERS
 
    Tax-exempt entities, including qualified employee pension and profit sharing
trusts and individual retirement accounts ("Exempt Organizations"), generally
are exempt from federal income taxation. However, they are subject to taxation
on their unrelated business taxable income ("UBTI"). While many investments in
real estate generate UBTI, the IRS has issued a published ruling that dividend
distributions from a REIT to an exempt employee pension trust do not constitute
UBTI, provided that the shares of the REIT are not otherwise used in an
unrelated trade or business of the exempt employee pension trust. Based on that
ruling, amounts distributed by the Company to Exempt Organizations generally
should not constitute UBTI. However, if an Exempt Organization finances its
acquisitions of the common shares with debt, a portion of its income from the
Company will constitute UBTI pursuant to the "debt-financed property" rules.
Furthermore, social clubs, voluntary employee benefit associations, supplemental
unemployment benefit trusts, and qualified group legal services plans that are
exempt from taxation under paragraphs (7), (9), (17), and (20), respectively, of
Code section 501(c) are subject to different UBTI rules, which generally will
require them to characterize distributions from the Company as UBTI.
 
    In addition, in certain circumstances, a pension trust that owns more than
10% of the Company's shares is required to treat a percentage of the dividends
from the Company as UBTI (the "UBTI Percentage"). The UBTI Percentage is the
gross income derived by the Company from an unrelated trade or business
(determined as if the Company were a pension trust) divided by the gross income
of the Company for the year in which the dividends are paid. The UBTI rule
applies to a pension trust holding more than 10% of the Company's stock only if
(i) the UBTI Percentage is at least 5%, (ii) the Company qualifies as a REIT by
reason of the modification of the "five or fewer" stock ownership requirement
that allows the beneficiaries of the pension trust to be treated as holding
shares of the Company in proportion to their actuarial interests in the pension
trust, and (iii) either (A) one pension trust owns more that 25% of the value of
the Company's shares or (B) a group of pension trusts individually holding more
than 10% of the value of the Company's shares collectively owns more than 50% of
the value of the Company's shares.
 
BACKUP WITHHOLDING
 
    The Company will report to its domestic shareholders and the IRS the amount
of dividends paid during each calendar year, and the amount of tax withheld, if
any. Under the backup withholding rules, a 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, demonstrates this fact, or (b) provides a taxpayer identification
number, certifies as to no loss of exemption from backup withholding, and
otherwise complies with applicable requirements of the backup withholding rules.
A shareholder that does not provide the Company with his correct taxpayer
identification number may also be subject to penalties imposed by the IRS. Any
amount paid as backup withholding will be creditable
 
                                       31
<PAGE>
against the shareholder's income tax liability. In addition, the Company may be
required to withhold a portion of capital gain distributions to any shareholders
who fail to certify their non-foreign status to the Company.
 
    The Treasury Department recently issued proposed regulations regarding the
withholding and information reporting rules discussed above. In general, the
proposed regulations do not alter the substantive withholding requirements but
unify current certification procedures and forms, and clarify and modify
reliance standards. If finalized in their current form, the proposed regulations
would generally be effective for payments made after December 31, 1997, subject
to certain transition rules.
 
TAXATION OF NON-U.S. SHAREHOLDERS
 
    The rules governing U.S. Federal income taxation of nonresident alien
individuals, foreign corporations, foreign partnerships and other foreign
shareholders (collectively, "Non-U.S. Shareholders") are complex, and no attempt
will be made herein to provide more than a limited summary of such rules.
Prospective Non-U.S. Shareholders should consult with their own tax advisors to
determine the impact of U.S. Federal, state and local income tax laws with
regard to an investment in common stock, including any reporting requirements.
 
    Distributions that are not attributable to gain from sales or exchanges by
the Company of U.S. real property interests and not designated by the Company as
capital gain dividends will be treated as dividends of ordinary income to the
extent that they are made out of current or accumulated earnings and profits of
the Company. Such distributions, ordinarily, will be subject to a withholding
tax equal to 30% of the gross amount of the distribution unless an applicable
tax treaty reduces that tax. Distributions in excess of current and accumulated
earnings and profits of the Company will not be taxable to a Non-U.S.
Shareholder to the extent that they do not exceed the adjusted basis of the
shareholder's common stock, but rather will reduce the adjusted basis of such
common stock. To the extent that such distributions exceed the adjusted tax
basis of a Non-U.S. Shareholder's common stock, they will give rise to tax
liability if the Non-U.S. Shareholder would otherwise be subject to tax on any
gain from the sale or disposition of his common stock as described below (in
which case they also may be subject to a 30% branch profits tax if the
shareholder is a foreign corporation). As a result of a legislative change made
by the Small Business Job Protection Act of 1996, effective for distributions
made after August 20, 1996, the Company is required to withhold 10% of any
distribution in excess of the Company's current accumulated earnings and
profits. Consequently, although the Company intends to withhold at a rate of 30%
on the entire amount of any distribution, to the extent that the Company does
not do so any portion of a distribution not subject to withholding at a rate of
30% will be subject to withholding at a rate of 10%. However, the Non-U.S.
Shareholder may seek a refund of such amounts from the IRS if it is subsequently
determined that such distribution was, in fact, in excess of current or
accumulated earnings and profits of the Company, and the amount withheld exceeds
the Non-U.S. Shareholder's United States tax liability, if any, with respect to
the distribution.
 
    For any year in which the Company qualifies as a REIT, distributions that
are attributable to gain from sales or exchanges by the Company of U.S. real
property interests will be taxed to a Non-U.S. Shareholder under the provisions
of the Foreign Investment in Real Property Tax Act of 1980 ("FIRPTA") at the
normal capital gain rates applicable to domestic shareholders (subject to
applicable alternative minimum tax and a special alternative minimum tax in the
case of nonresident alien individuals). Also, distributions subject to FIRPTA
may be subject to a 30% branch profits tax in the hands of a corporate Non-U.S.
Shareholder not entitled to treaty relief or exemption. The Company is required
to withhold 35% of any distribution that is or could be designated by the
Company as a capital gain dividend. The amount withheld is creditable against
the Non-U.S. Shareholder's FIRPTA tax liability.
 
    Gain recognized by a Non-U.S. Shareholder upon a sale of common stock
generally will not be taxed under FIRPTA if the Company is a "domestically
controlled REIT," defined generally as a REIT in which at all times during a
specified testing period less than 50% in value of the stock was held directly
or indirectly by foreign persons. The Company believes that it is a
"domestically controlled REIT," and, therefore, that the
 
                                       32
<PAGE>
sale of common stock will not be subject to taxation under FIRPTA. If the gain
on the sale of common stock were to be subject to tax under FIRPTA, the Non-U.S.
Shareholder would be subject to the same treatment as domestic shareholders with
respect to such gain (subject to applicable alternative minimum tax and a
special alternative minimum tax in the case of nonresident alien individuals),
and the purchaser of the common stock would be required to withhold and remit to
the IRS 10% of the purchase price.
 
STATE AND LOCAL TAXES
 
    The Company or its shareholders or both may be subject to state, local or
other taxation in various state, local or other jurisdictions, including those
in which they transact business or reside. The tax treatment in such
jurisdictions may differ from the Federal income tax consequences discussed
above. Consequently, prospective shareholders should consult their own tax
advisors regarding the effect of state and local tax laws on an investment in
shares of the Company.
 
                              PLAN OF DISTRIBUTION
 
    The Company and the Operating Partnership may sell Securities to or through
underwriters, and also may sell Securities directly to other purchasers or
through agents.
 
    The distribution of the Securities may be effected from time to time in one
or more transactions at a fixed price or prices, which may be changed, or at
market prices prevailing at the time of sale, at prices related to such
prevailing market prices or at negotiated prices.
 
    In connection with the sale of Securities, underwriters may receive
compensation from the Company, from the Operating Partnership or from purchasers
of Securities, for whom they may act as agents, in the form of discounts,
concessions, or commissions. Underwriters may sell Securities to or through
dealers, and such dealers may receive compensation in the form of discounts,
concessions, or commissions from the underwriters and/or commissions from the
purchasers for whom they may act as agents. Underwriters, dealers, and agents
that participate in the distribution of Securities may be deemed to be
underwriters, and any discounts or commissions they receive from the Company or
the Operating Partnership, and any profit on the resale of Securities they
realize may be deemed to be underwriting discounts and commissions, under the
Securities Act. Any such underwriter or agent will be identified, and any such
compensation received from the Company or the Operating Partnership will be
described, in the Prospectus Supplement.
 
    Unless otherwise specified in the related Prospectus Supplement, each series
of Securities will be a new issue with no established trading market, other than
the Common Stock which is listed on the NYSE. Any shares of Common Stock sold
pursuant to a Prospectus Supplement will be listed on such exchange, subject to
official notice of issuance. The Company or the Operating Partnership may elect
to list any series of Debt Securities, Preferred Stock or Depositary Shares on
an exchange, but neither is obligated to do so. It is possible that one or more
underwriters may make a market in a series of Securities, but will not be
obligated to do so and may discontinue any market making at any time without
notice. Therefore, no assurance can be given as to the liquidity of the trading
market for the Securities.
 
    Under agreements the Company and the Operating Partnership may enter into,
underwriters, dealers, and agents who participate in the distribution of
Securities may be entitled to indemnification by the Company or the Operating
Partnership against certain liabilities, including liabilities under the
Securities Act.
 
    Underwriters, dealers and agents may engage in transactions with, or perform
services for, or be customers of, the Company or the Operating Partnership in
the ordinary course of business.
 
    If so indicated in the applicable Prospectus Supplement, the Company or the
Operating Partnership, as the case may be, will authorize underwriters or other
persons acting as the Company's or the Operating Partnership's agents to solicit
offers by certain institutions to purchase Securities from the Company or the
Operating Partnership 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,
 
                                       33
<PAGE>
pension funds, investment companies, educational and charitable institutions and
others, but in all cases such institutions must be approved by the Company or
the Operating Partnership, as the case may be. The obligations of any purchaser
under any such contract will be subject to the condition that 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. The underwriters and such
other agents will not have any responsibility in respect of the validity or
performance of such contracts.
 
                                 LEGAL OPINIONS
 
    The legality of the Securities offered hereby is being passed upon for the
Company by Bose McKinney & Evans, Indianapolis, Indiana. In addition, the
description of Federal income tax matters contained in this Prospectus entitled
"Federal Income Tax Considerations" is based upon the opinion of Bose McKinney &
Evans. John W. Wynne and Darell E. Zink, Jr., officers and directors of the
Company, were partners in Bose McKinney & Evans through 1987 and 1982,
respectively, and were of counsel to that firm until December, 1990.
 
                                    EXPERTS
 
    The Consolidated Financial Statements and related Schedules of the Company
and of the Operating Partnership as of December 31, 1997 and 1996, and for each
of the years in the three-year period ended December 31, 1997, each incorporated
herein by reference, have been incorporated herein in reliance upon the reports
of KPMG Peat Marwick LLP, independent certified public accountants, also
incorporated by reference herein, and upon the authority of said firm as experts
in accounting and auditing.
 
                                       34
<PAGE>
                                4,000,000 SHARES
 
                                     [LOGO]
 
                               DEPOSITARY SHARES
                  EACH REPRESENTING 1/10 OF AN 8 1/4% SERIES E
                     CUMULATIVE REDEEMABLE PREFERRED SHARE
                          (PAR VALUE $0.01 PER SHARE)
       (LIQUIDATION PREFERENCE EQUIVALENT TO $25.00 PER DEPOSITARY SHARE)
                             ---------------------
 
                             PROSPECTUS SUPPLEMENT
 
                          ----------------------------
 
                              MERRILL LYNCH & CO.
                           A.G. EDWARDS & SONS, INC.
                           MORGAN STANLEY DEAN WITTER
                            PAINEWEBBER INCORPORATED
                              SALOMON SMITH BARNEY
 
                                JANUARY 14, 1999


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