WEEKS CORP
8-K, 1999-03-05
REAL ESTATE INVESTMENT TRUSTS
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION


                            Washington, D.C. 20549


                          __________________________


                                   FORM 8-K

                                CURRENT REPORT


    Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

      Date of Report (Date of earliest event reported) February 28, 1999
                                                       -----------------

                               Weeks Corporation
                               -----------------
            (Exact name of registrant as specified in its charter)

 
 
            Georgia                   011-13254              58-1525322
- --------------------------------     -----------         ------------------
  (State or other jurisdiction       (Commission            (IRS Employer
        of incorporation)            File Number)        Identification No.)
 

       4497 Park Drive, Norcross, Georgia                        30093
- -------------------------------------------------------------------------------
    (Address of principal executive offices)                  (Zip Code)


Registrant's telephone number, including area code  (770) 923-4076
                                                   ---------------
<PAGE>
 
Item 5.  Other Events
- ---------------------

     On March 1, 1999, Weeks Corporation, a Georgia corporation ("Weeks"),
announced that it had entered into an Agreement and Plan of Merger (the "REIT
Merger Agreement") with Duke Realty Investments, Inc., an Indiana corporation
("Duke"), and that Weeks Realty, L.P., a Georgia limited partnership of which
Weeks is the general partner (through a wholly owned subsidiary) ("Weeks OP"),
had entered into an Agreement and Plan of Merger (the "OP Merger Agreement" and,
together with the REIT Merger Agreement, the "Merger Agreements") with Duke
Realty Limited Partnership, an Indiana limited partnership of which Duke is the
managing general partner ("Duke OP"). The Merger Agreements provide for a merger
of Weeks with and into Duke (the "REIT Merger") and a merger of Weeks OP with
and into Duke OP (the "OP Merger" and, together with the REIT Merger, the
"Mergers"). At the effective time of the Mergers, Duke will change its name to
Duke-Weeks Realty Corporation.

     Pursuant to the Merger Agreements: (i) each outstanding share of common
stock, par value $0.01 per share, of Weeks ("Weeks Common Stock") will be
converted into the right to receive 1.38 shares of common stock, par value $0.01
per share, of Duke ("Duke Common Stock"); (ii) each issued and outstanding share
of 8.0% Series A Cumulative Redeemable Preferred Stock, par value $0.01 per
share, of Weeks will be converted into the right to receive one preference share
representing 1/1000 of a share of 8.0% Series F Cumulative Redeemable Preferred
Stock, par value $0.01 per share, of Duke; (iii) each issued and outstanding
share of 8.625% Series D Cumulative Redeemable Preferred Stock, par value $.01
per share, of Weeks will be converted into the right to receive one preference
share representing 1/1000 of a share of 8.625% Series H Cumulative Redeemable
Preferred Stock, par value $0.01 per share, of Duke; (iv) each issued and
outstanding common unit of limited partnership interest in Weeks OP will be
converted into 1.38 common units of limited partnership interest in Duke OP; (v)
each issued and outstanding 8.0% Series A Cumulative Redeemable Preferred
Partnership Unit in Weeks OP will be converted into 1/1000 of one 8.0% Series F
Cumulative Redeemable Preferred Unit in Duke OP; (vi) each issued and
outstanding 8.0% Series C Cumulative Redeemable Preferred Partnership Unit in
Weeks OP will be converted into 1/1000 of one 8.0% Series G Cumulative
Redeemable Preferred Unit in Duke OP; and (vii) each issued and outstanding
8.625% Series D Cumulative Redeemable Preferred Partnership Unit in Weeks OP
will be converted into 1/1000 of one 8.625% Series H Cumulative Redeemable
Preferred Unit in Duke OP.

     Holder's representing 2% of the outstanding Weeks Common Stock have entered
into voting agreements, agreeing to vote their shares in favor of the
transactions contemplated by the Merger Agreements. Holder's representing 5% of
the outstanding Duke Common Stock have entered into voting agreements, agreeing
to vote their shares in favor of the transactions contemplated by the Merger
Agreements. The requisite approvals of the partners of Duke OP and Weeks OP to
the transactions have been obtained.

                                      -2-

<PAGE>
 
     The consummation of the transactions contemplated by the Merger Agreements
is expected to occur in the second or third quarter of 1999 and is subject to
approval by the stockholders of Duke and the shareholders of Weeks and
satisfaction of certain other customary closing conditions. There can be no
assurance that the transactions contemplated by the Merger Agreements will be
consummated. Weeks has agreed with Duke that if the REIT Merger Agreement is
terminated under certain circumstances, Weeks will pay Duke certain fees and
expenses. Duke has agreed with Weeks that if the REIT Merger Agreement is
terminated under certain other circumstances, Duke will pay Weeks certain fees
and expenses.

     A copy of the Merger Agreements, the Proxies, the press release announcing
the Merger Agreements and related supplemental materials are included as
exhibits to this report and are incorporated herein by reference.

     Certain matters discussed in this report and the exhibits hereto may be 
deemed to be forward-looking statements within the meaning of the Private 
Securities Litigation Reform Act of 1995. Although Weeks believes the 
expectations reflected in such forward-looking statements are based on 
reasonable assumptions, it can give no assurance that its expectations will be 
attained. Factors that could cause actual results to differ materially from 
expectations include changes in real estate conditions, changes in local or
national economic conditions and other risks detailed from time to time in
reports and filings made with the Securities and Exchange Commission by Weeks,
including its Quarterly Reports on Form 10-Q, Reports on Form 8-K, and Annual
Reports on Form 10-K. Weeks assumes no obligation to update or supplement
forward-looking statements that become untrue because of subsequent events.

ITEM 7.   Financial Statements and Exhibits

          (c)  Exhibits

               10.1 Agreement and Plan of Merger, dated as of February 28, 1999,
                    by and among Duke Realty Investments, Inc. and Weeks
                    Corporation.

               10.2 Agreement and Plan of Merger, dated as of February 28, 1999,
                    by and among Duke Realty Limited Partnership and Weeks
                    Realty, L.P.

               10.3 Form of Agreement and Irrevocable Proxy by and among Weeks
                    and certain holders of Duke Common Stock and Duke Common
                    Units.

               10.4 Form of Agreement and Irrevocable Proxy by and among Duke
                    and certain holders of Weeks Common Stock and Weeks Common
                    Units.

               99.1 Press Release dated March 1, 1999.

               99.2 Supplemental materials.

                                      -3-
<PAGE>
 
                                   SIGNATURE


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


                              WEEKS CORPORATION
                              (Registrant)


                                  
Date: March 5, 1999           By: /s/ David P. Stockert
                                  -----------------------------------------
                                  David P. Stockert
                                  Senior Vice President and
                                  Chief Financial Officer
 

                                      -4-
<PAGE>
 
                                 EXHIBIT INDEX



10.1 Agreement and Plan of Merger, dated as of  February 28, 1999, by and among
     Duke Realty Investments, Inc. and Weeks Corporation.

10.2 Agreement and Plan of Merger, dated as of February 28, 1999, by and among
     Duke Realty Limited Partnership and Weeks Realty, L.P.

10.3 Form of Agreement and Irrevocable Proxy by and among Weeks and certain
     holders of Duke Common Stock and Duke Common Units.

10.4 Form of Agreement and Irrevocable Proxy by and among Duke and certain
     holders of Weeks Common Stock and Weeks Common Units.

99.1 Press Release dated March 1, 1999.

99.2 Supplemental materials.

                                      -5-

<PAGE>
 
                                                                    EXHIBIT 10.1


 


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




                         AGREEMENT AND PLAN OF MERGER




                         Dated as of February 28, 1999



                                 by and among



                         DUKE REALTY INVESTMENTS, INC.

                                      and

                               WEEKS CORPORATION





- -------------------------------------------------------------------------------
<PAGE>
 
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                                               Page
<S>                    <C>                                                                                                     <C>
ARTICLE I             THE REIT MERGER.....................................................................................       2  

     Section 1.1.         The REIT Merger.................................................................................       2  

     Section 1.2.         Closing.........................................................................................       2  

     Section 1.3.         Effective Time..................................................................................       2  

     Section 1.4.         Charter and By-laws.............................................................................       2  

     Section 1.5.         Directors.......................................................................................       3  

     Section 1.6.         Officers........................................................................................       3  

ARTICLE II                EFFECTS OF THE REIT MERGER; EXCHANGE OF CERTIFICATES............................................       3  

     Section 2.1.         Effect on Capital Stock.........................................................................       3  

          (a)             Capital Stock Owned by Weeks or its Subsidiaries................................................       3  

          (b)             Conversion of Weeks Capital Stock Into Duke Capital Stock.......................................       3  

          (c)             Shares of Duke Capital Stock....................................................................       4  

     Section 2.2.         Exchange of Certificates........................................................................       4  

          (a)             Exchange Agent..................................................................................       4  

          (b)             Duke to Provide Merger Consideration............................................................       4  

          (c)             Exchange Procedure..............................................................................       4  

          (d)             Record Dates; Distributions with Respect to Unexchanged Shares..................................       5  

          (e)             No Further Ownership Rights in Weeks Capital Stock..............................................       5  

          (f)             Unclaimed Merger Consideration..................................................................       6  

          (g)             No Fractional Shares............................................................................       6  

          (h)             Withholding.....................................................................................       6  

          (i)             No Dissenters' Rights...........................................................................       6  

ARTICLE III               REPRESENTATIONS AND WARRANTIES..................................................................       6  

     Section 3.1.         Representations and Warranties of Weeks.........................................................       6  

          (a)             Organization, Standing and Corporate Power of Weeks.............................................       6  

          (b)             Weeks Subsidiaries; Interests in Other Persons..................................................       7  

          (c)             Capital Structure...............................................................................       7  

          (d)             Authority; Noncontravention; Consents...........................................................       9  

          (e)             SEC Documents; Financial Statements; Undisclosed Liabilities....................................      10  

          (f)             Absence of Certain Changes or Events............................................................      10  

          (g)             Litigation......................................................................................      11  

          (h)             Absence of Changes in Benefit Plans; ERISA Compliance...........................................      11  

          (i)             Taxes...........................................................................................      12  

          (j)             No Loans or Payments to Employees, Officers or Directors........................................      13
</TABLE> 

                                       I
<PAGE>
 
                               TABLE OF CONTENTS
<TABLE> 
<CAPTION> 
<S>                       <C>                                                                                                   <C> 

          (k)             Brokers; Schedule of Fees and Expenses..........................................................      13
          (l)             Compliance with Laws............................................................................      13
          (m)             Contracts; Debt Instruments.....................................................................      13
          (n)             OP Agreement....................................................................................      14
          (o)             Environmental Matters...........................................................................      14
          (p)             Weeks Properties................................................................................      16
          (q)             Books and Records...............................................................................      17
          (r)             Opinion of Financial Advisor....................................................................      17
          (s)             State Takeover Statutes; Rights Agreement.......................................................      17
          (t)             Investment Company Act of 1940..................................................................      17
          (u)             Proxy Statement and Registration Statement......................................................      17
          (v)             Vote Required...................................................................................      18
     Section 3.2.         Representations and Warranties of Duke..........................................................      18
          (a)             Organization, Standing and Corporate Power of Duke..............................................      18
          (b)             Duke Subsidiaries; Interests in Other Persons...................................................      19
          (c)             Capital Structure...............................................................................      19
          (d)             Authority; Noncontravention; Consents...........................................................      20
          (e)             SEC Documents; Financial Statements; Undisclosed Liabilities....................................      21
          (f)             Absence of Certain Changes or Events............................................................      22
          (g)             Litigation......................................................................................      22
          (h)             Absence of Changes in Benefit Plans; ERISA Compliance...........................................      23
          (i)             Taxes...........................................................................................      24
          (j)             No Loans or Payments to Employees, Officers or Directors........................................      24
          (k)             Brokers; Schedule of Fees and Expenses..........................................................      24
          (l)             Compliance with Laws............................................................................      25
          (m)             Contracts; Debt Instruments.....................................................................      25
          (n)             Duke OP Agreement...............................................................................      25
          (o)             Environmental Matters...........................................................................      25
          (p)             Duke Properties.................................................................................      27
          (q)             Opinion of Financial Advisor....................................................................      27
          (r)             State Takeover Statutes.........................................................................      27
          (s)             1940 Act........................................................................................      28
          (t)             Proxy Statement and Registration Statement......................................................      28
          (u)             Vote Required...................................................................................      28 
</TABLE> 

                                       II
<PAGE>
 
<TABLE> 
<CAPTION> 
<S>                        <C>                                                                                                  <C> 

ARTICLE IV                COVENANTS.......................................................................................      29
     Section 4.1.         Conduct of Business by Weeks and Weeks OP.......................................................      29
     Section 4.2.         Conduct of Business by Duke.....................................................................      31
     Section 4.3.         Other Actions...................................................................................      32
ARTICLE V                 ADDITIONAL COVENANTS............................................................................      33
     Section 5.1.         Preparation of the Registration Statement and the Proxy Statement; Shareholders' Meetings;              
                          Partners' Consents..............................................................................      33
     Section 5.2.         Access to Information; Confidentiality..........................................................      34
     Section 5.3.         Commercially Reasonable Efforts; Notification...................................................      34
     Section 5.4.         Affiliates......................................................................................      35
     Section 5.5.         Tax Treatment...................................................................................      35
     Section 5.6.         No Solicitation of Transactions.................................................................      35
     Section 5.7.         Public Announcements............................................................................      36
     Section 5.8.         NYSE Listing....................................................................................      36
     Section 5.9.         Letters of Accountants..........................................................................      36
     Section 5.10.        Transfer and Gains Taxes; Shareholder Demand Letters............................................      37
     Section 5.11.        Benefit Plans and Other Employee Arrangements...................................................      37
          (a)             Benefit Plans...................................................................................      37
          (b)             Stock Incentive Plans...........................................................................      37
          (c)             Change in Control Agreements....................................................................      38
     Section 5.12.        Indemnification; Directors' and Officers' Insurance.............................................      38
     Section 5.13.        Provisions Relating to Certain Weeks Indebtedness...............................................      40
     Section 5.14.        The Weeks Rights Plan...........................................................................      40
     Section 5.15.        Coordination of Dividends.......................................................................      40
     Section 5.16.        Existing Restrictions on Resale of Certain Falcon Properties....................................      40
     Section 5.17.        Assumption of Warrants..........................................................................      40
     Section 5.18.        Weeks Notes.....................................................................................      41
     Section 5.19.        Duke OP Partnership Agreement...................................................................      41
     Section 5.20.        Registration Rights Agreements..................................................................      41
     Section 5.21.        Interim Transactions Committee..................................................................      41
     Section 5.22.        Executive Officer Appointments..................................................................      41
ARTICLE VI                CONDITIONS PRECEDENT............................................................................      41
     Section 6.1.         Conditions to Each Party's Obligation to Effect the Merger......................................      41
          (a)             Shareholder Approvals...........................................................................      41
          (b)             Listing of Shares...............................................................................      42 
</TABLE> 

                                      III
<PAGE>
 
<TABLE> 
<CAPTION> 
<S>                       <C>                                                                                                  <C> 
          (c)             Registration Statement..........................................................................      42
          (d)             No Injunctions or Restraints....................................................................      42
          (e)             HSR Act.........................................................................................      42
     Section 6.2.         Conditions to Obligations of Duke...............................................................      42
          (a)             Representations and Warranties..................................................................      42
          (b)             Performance of Obligations of Weeks and Weeks OP................................................      42
          (c)             Material Adverse Change.........................................................................      42
          (d)             Opinions Relating to REIT and Partnership Status................................................      42
          (e)             Other Tax Opinion...............................................................................      43
          (f)             Consents........................................................................................      43
     Section 6.3.         Conditions to Obligation of Weeks and Weeks OP..................................................      43
          (a)             Representations and Warranties..................................................................      43
          (b)             Performance of Obligations of Duke and Duke OP..................................................      43
          (c)             Material Adverse Change.........................................................................      43
          (d)             Opinions Relating to REIT and Partnership Status................................................      43
          (e)             Other Tax Opinion...............................................................................      43
          (f)             Consents........................................................................................      44
          (g)             Directors' Resignations.........................................................................      44
ARTICLE VII               BOARD ACTIONS...................................................................................      44
     Section 7.1.         Board Actions...................................................................................      44
     Section 7.2.         Weeks Subsidiary Boards.........................................................................      44
ARTICLE VIII              TERMINATION, AMENDMENT AND WAIVER...............................................................      45
     Section 8.1.         Termination.....................................................................................      45
     Section 8.2.         Expenses........................................................................................      46
     Section 8.3.         Effect of Termination...........................................................................      48
     Section 8.4.         Amendment.......................................................................................      48
     Section 8.5.         Extension; Waiver...............................................................................      49
ARTICLE IX                GENERAL PROVISIONS..............................................................................      49
     Section 9.1.         Nonsurvival of Representations and Warranties...................................................      49
     Section 9.2.         Notices.........................................................................................      49
     Section 9.3.         Interpretation..................................................................................      50
     Section 9.4.         Counterparts....................................................................................      50
     Section 9.5.         Entire Agreement; No Third-Party Beneficiaries..................................................      50
     Section 9.6.         GOVERNING LAW...................................................................................      50 
</TABLE> 

                                       IV
<PAGE>
 
<TABLE> 
<CAPTION> 
<S>                       <C>                                                                                                  <C> 
     Section 9.7.         Assignment......................................................................................      51
     Section 9.8.         Enforcement.....................................................................................      51
ARTICLE X                 CERTAIN DEFINITIONS.............................................................................      51
     Section 10.1.        Certain Definitions.............................................................................      51
 
     Schedules
     A                    Holders of Weeks Common Stock and OP Units Delivering Proxies to Duke
     B                    Holders of Duke Common Stock and OP Units Delivering Proxies to Weeks
     C                    Service Companies Owners
     D                    Directors of the Surviving Corporation if 80% Duke Approval is Obtained
     E                    Directors of the Surviving Corporation if 80% Duke Approval is Not Obtained
     F                    Officers of the Surviving Corporation
     Exhibits
     A                    Form of OP Merger Agreement
     B                    Form of Weeks Agreement and Irrevocable Proxy
     C                    Form of Duke Agreement and Irrevocable Proxy
     D                    Forms of Weeks Services Companies Option Agreement
     E                    Charter of the Surviving Corporation (if 80% Duke Approval is Obtained)
     F                    By-laws of the Surviving Corporation (if 80% Duke Approval is Obtained)
     G                    Charter of the Surviving Corporation (if 80% Duke Approval is Not Obtained)
     H                    By-laws of the Surviving Corporation (if 80% Duke Approval is Not Obtained)
     I                    Form of Affiliates Letter
     J                    Duke Operating Partnership Agreement Amendments
     K                    Form of King & Spalding Tax Opinion
     L                    Form of Rogers & Wells LLP Tax Opinion
</TABLE> 

                                       V
<PAGE>
 
<TABLE> 
<CAPTION> 
<S>                                                                                                                             <C> 

1940 Act................................................................................................................        17
Acquiring Person........................................................................................................        17
affiliate...............................................................................................................        51
Agreement...............................................................................................................         1
Base Amount.............................................................................................................        46
Board...................................................................................................................         3
By-laws.................................................................................................................         2
CERCLA..................................................................................................................        15
Certificate.............................................................................................................         4
Charter.................................................................................................................         2
Closing.................................................................................................................         2
Closing Date............................................................................................................         2
Code....................................................................................................................         1
Competing Transaction...................................................................................................        36
Confidentiality Agreement...............................................................................................        34
DMI Restructuring.......................................................................................................        32
Duke....................................................................................................................         1
Duke Benefit Plan.......................................................................................................        23
Duke Break-Up Expenses..................................................................................................        46
Duke Break-UP Fee.......................................................................................................        46
Duke Break-UP Fee Tax Opinion ..........................................................................................        46
Duke Building Systems...................................................................................................        28
Duke Common Stock.......................................................................................................         3
Duke Disclosure Letter..................................................................................................        18
Duke Encumbrances.......................................................................................................        27
Duke ERISA Affiliate....................................................................................................        23
Duke Exchange Agreements................................................................................................        20
Duke Expense Fee Base Amount............................................................................................        47
Duke Financial Statement Date...........................................................................................        22
Duke Information Technology.............................................................................................        28
Duke Material Adverse Change............................................................................................        22
Duke Material Adverse Effect............................................................................................        19
Duke Merger Shareholder Approval........................................................................................        28
Duke OP.................................................................................................................         1
Duke OP Approvals.......................................................................................................        28
Duke OP Units...........................................................................................................        20
Duke Other Interests....................................................................................................        19
Duke Preferred Stock....................................................................................................        19
Duke Properties.........................................................................................................        27
Duke Property Restrictions..............................................................................................        27
Duke SEC Documents......................................................................................................        21
Duke Series F Preferred Stock...........................................................................................         3
Duke Series H Preferred Stock...........................................................................................         3
Duke Shareholder Approvals..............................................................................................        28
Duke Shareholders Meeting...............................................................................................        33
Duke Special Charter Shareholder Approval...............................................................................        28
Duke Stock Options......................................................................................................        20
Duke Stock Plans........................................................................................................        19
Duke Subsidiary.........................................................................................................        52
Duke Tax Protection Agreement...........................................................................................        25 
</TABLE> 

                                       VI
<PAGE>
 
<TABLE> 
<CAPTION> 
<S>                                                                                                                       <C> 
Duke Voting Agreements..................................................................................................         1
Duke Y2K Plan...........................................................................................................        28
Effective Time..........................................................................................................         2
Employee Plan...........................................................................................................        51
Environmental Law.......................................................................................................        15
ERISA...................................................................................................................        11
Exchange Act............................................................................................................        10
Exchange Agent..........................................................................................................         4
Exchange Ratio..........................................................................................................         3
Executive Officer Appointments..........................................................................................        41
Final Weeks Dividend....................................................................................................         5
GAAP....................................................................................................................        10
GBCC....................................................................................................................         2
Governing Laws..........................................................................................................         2
Governmental Entity.....................................................................................................         9
Hazardous Material......................................................................................................        16
HSR Act.................................................................................................................        10
IBCL....................................................................................................................         2
indebtedness............................................................................................................        14
Indemnified Liabilities.................................................................................................        38
Indemnified Parties.....................................................................................................        38
Indemnifying Parties....................................................................................................        38
Knowledge...............................................................................................................        51
Law.....................................................................................................................        51
Laws....................................................................................................................         9
Liens...................................................................................................................         7
Merger Consideration....................................................................................................         4
New Duke Preference Shares..............................................................................................         3
New Duke Preferred Stock................................................................................................         3
NYSE....................................................................................................................         6
OP Merger...............................................................................................................         1
OP Merger Agreement.....................................................................................................         1
Option Holder...........................................................................................................         1
Person..................................................................................................................        52
Proxy Statement.........................................................................................................         9
Qualifying Income.......................................................................................................        46
Registration Statement..................................................................................................        10
REIT....................................................................................................................         1
REIT Merger.............................................................................................................         1
REIT Requirements.......................................................................................................        46
Release.................................................................................................................        15
Rights Agreement........................................................................................................    11, 17
SEC.....................................................................................................................         9
Securities Act..........................................................................................................        10
Series F Preference Share...............................................................................................         3
Series H Preference Share...............................................................................................         3
Services Companies Owners...............................................................................................         1
Subsidiary..............................................................................................................        52
Superior Competing Transaction..........................................................................................        44
Surviving Corporation...................................................................................................         2
Surviving Corporation Material Adverse Effect...........................................................................        42 
</TABLE> 

                                      VII
<PAGE>
 
<TABLE> 
<CAPTION> 
<S>                                                                                                                           <C> 
Takeover Statute........................................................................................................        35
Tax Return..............................................................................................................        12
Taxes or Tax............................................................................................................        12
Taxing Authority........................................................................................................        12
Transfer and Gains Taxes................................................................................................        37
Weeks...................................................................................................................         1
Weeks Benefit Plan......................................................................................................        11
Weeks Break-Up Expenses.................................................................................................        48
Weeks Break-Up Fee......................................................................................................        47
Weeks Break-Up Fee Tax Opinion..........................................................................................        47
Weeks Building Systems..................................................................................................        18
Weeks Common Stock......................................................................................................         1
Weeks Disclosure Letter.................................................................................................         6
Weeks Encumbrances......................................................................................................        16
Weeks ERISA Affiliate...................................................................................................        11
Weeks Exchange Agreements...............................................................................................         8
Weeks Expense Fee Base Amount...........................................................................................        48
Weeks Financial Statement Date..........................................................................................        10
Weeks GP................................................................................................................         8
Weeks Information Technology............................................................................................        18
Weeks LP................................................................................................................         8
Weeks Material Adverse Change...........................................................................................        10
Weeks Material Adverse Effect...........................................................................................         7
Weeks OP................................................................................................................         1
Weeks OP Agreement......................................................................................................        14
Weeks OP Approvals......................................................................................................        18
Weeks OP Units..........................................................................................................         8
Weeks Other Interests...................................................................................................         7
Weeks Preferred Stock...................................................................................................         1
Weeks Properties........................................................................................................        16
Weeks Property Restrictions.............................................................................................        16
Weeks SEC Documents.....................................................................................................        10
Weeks Series A Preferred Stock..........................................................................................         1
Weeks Series D Preferred Stock..........................................................................................         1
Weeks Services Companies................................................................................................         2
Weeks Services Companies Option Agreement...............................................................................         1
Weeks Shareholder Approvals.............................................................................................        18
Weeks Shareholders Meeting..............................................................................................        33
Weeks Stock Options.....................................................................................................         8
Weeks Stock Plans.......................................................................................................         7
Weeks Subsidiary........................................................................................................        52
Weeks Tax Protection Agreement..........................................................................................        14
Weeks Voting Agreements.................................................................................................         1
Weeks Y2K Plan..........................................................................................................        18
Year 2000 Ready.........................................................................................................        18 
</TABLE>

                                      VIII
<PAGE>
 
AGREEMENT AND PLAN OF MERGER (the "Agreement"), dated as of February 28, 1999,
                                   ---------                                  
by and between DUKE REALTY INVESTMENTS, INC., an Indiana corporation "Duke"),
                                                                      ----   
and WEEKS CORPORATION, a Georgia corporation "Weeks").
                                              -----   

                                    RECITALS

     A.  The Boards of Directors of Duke and Weeks each have determined that it
is advisable and in the best interest of their respective companies and
shareholders that upon the terms and subject to the conditions set forth in this
Agreement, Weeks will merge with and into Duke, with Duke being the surviving
corporation, in a merger (the "REIT Merger") in which each issued and
                               -----------                           
outstanding share of common stock, par value $.01 per share, of Weeks (the
"Weeks Common Stock"), each issued and outstanding share of 8.0% Series A
- -------------------                                                      
Cumulative Redeemable Preferred Stock, par value $.01 per share, of Weeks (the
                                                                              
"Weeks Series A Preferred Stock") and each issued and outstanding share, if any,
- -------------------------------                                                 
of 8.625% Series D Cumulative Redeemable Preferred Stock, par value $.01 per
share, of Weeks (the "Weeks Series D Preferred Stock" and together with the
                      ------------------------------                       
Weeks Series A Preferred Stock, the "Weeks Preferred Stock") will be converted
                                     ---------------------                    
into the right to receive the applicable Merger Consideration (as defined
below).

     B.  Duke, as managing general partner of Duke Limited Partnership, an
Indiana limited partnership "Duke OP"), and Weeks, as general partner (through a
                             ------- 
wholly owned subsidiary) of Weeks, L.P., a Georgia limited partnership "Weeks
                                                                        -----
OP"), each has determined that it is advisable and in the best interest of their
- --   
respective partnerships and partners that upon the terms and subject to the
conditions set forth in an agreement and plan of merger between Duke OP and
Weeks OP executed on the date hereof, a copy of which is attached as Exhibit A
hereto (the "OP Merger Agreement"), Weeks OP will merge with and into Duke OP
             -------------------                                             
with Duke OP being the surviving partnership in such merger (the "OP Merger").
                                                                  ---------   

     C.  The parties intend that for federal income tax purposes the REIT Merger
will qualify as a tax-free reorganization under Section 368(a) of the Internal
Revenue Code of 1986, as amended (the "Code"), and that, following the REIT
                                       ----                                
Merger, Duke will continue to be subject to taxation as a real estate investment
trust (a "REIT") within the meaning of the Code.
          ----                                  

     D.  Contemporaneously with the execution and delivery of this Agreement,
(i) certain holders of Weeks Common Stock named in Schedule A hereto and certain
holders of limited partnership interests in Weeks OP named in Schedule A hereto
have entered into agreements, each substantially in the form of Exhibit B hereto
(the "Weeks Voting Agreements"), with Duke and Duke OP pursuant to which, among
      -----------------------                                                  
other things, those holders have granted to Duke irrevocable proxies to vote
their shares and partnership interests in favor of the REIT Merger, this
Agreement, the OP Merger, the OP Merger Agreement and the other transactions
contemplated hereby and thereby and against any competing proposal, and (ii)
certain holders of Duke Common Stock named in Schedule B hereto and certain
holders of limited partnership interests in Duke OP named in Schedule B hereto
have entered into agreements with Weeks and Weeks OP, each substantially in the
form of Exhibit C hereto (the "Duke Voting Agreements"), pursuant to which,
                               ----------------------                      
among other things, those holders have granted to Weeks irrevocable proxies to
vote their shares and partnership interests in favor of the REIT Merger, this
Agreement, the OP Merger, the OP Merger Agreement and the other transactions
contemplated hereby and thereby and against any competing proposal.

     E.  Contemporaneously with the execution and delivery of this Agreement,
the persons named in Schedule C hereto (collectively the "Services Companies
                                                          ------------------
Owners") have entered into an option agreement, a copy of which is attached as
Exhibit D hereto (the "Weeks Services Companies Option Agreement"), with MWSB,
                       -----------------------------------------              
Inc. (the "Option Holder") pursuant to which the Weeks Services Companies Owners
           -------------                                                        
have granted the Option Holder an option to acquire all of the interests of the
Weeks Services 
<PAGE>
 
Companies Owners in Weeks Realty Services, Inc. and Weeks Construction Services,
Inc. (together, the "Weeks Services Companies").
                     ------------------------   

                                   AGREEMENT

     In consideration of the representations, warranties, covenants and
agreements contained in this Agreement, the parties agree as follows:

                                   ARTICLE I

                                THE REIT MERGER
                                ---------------

     Section 1.1.  The REIT Merger.
                   --------------- 

     (a) Upon the terms and subject to the conditions set forth in this
Agreement, at the Effective Time (as hereinafter defined), Weeks shall be merged
with and into Duke in accordance with the Indiana Business Corporation Law (the
"IBCL") and the Georgia Business Corporation Code (the "GBCC," and together with
 ----                                                   ----                    
the IBCL, the "Governing Laws"), whereupon the separate corporate existence of
    ----       --------------                                                 
Weeks shall cease and Duke shall continue as the surviving corporation (the
                                                                           
"Surviving Corporation").
- ----------------------   

     (b) The REIT Merger shall have the effects set forth in the Governing Laws.
Accordingly, from and after the Effective Time, the Surviving Corporation shall
possess all the rights, privileges, powers and franchises and be subject to all
of the restrictions, disabilities, liabilities and duties of Duke and Weeks.

     Section 1.2.  Closing.  The closing of the REIT Merger (the "Closing") will
                   -------                                        -------       
take place at 10:00 a.m. New York City time on the second business day after
satisfaction or waiver of the conditions set forth in Article VI (the "Closing
                                                                       -------
Date"), at the offices of Rogers & Wells LLP, 200 Park Avenue, New York, New
- ----                                                                        
York 10166, unless another date or place is agreed to in writing by the parties.

     Section 1.3.  Effective Time.  On the Closing Date, the parties shall
                   --------------                                         
execute and file Articles of Merger or other appropriate documents in accordance
with the Governing Laws, and shall make all other filings or recordings required
with respect to the REIT Merger under the Governing Laws.  The REIT Merger shall
become effective one day after the day a certificate of merger or other
appropriate documents for the OP Merger have been duly filed with the Secretary
of State of Indiana and the Secretary of State of Georgia, or at such other time
or times as may be agreed by Duke and Weeks and specified in the Articles of
Merger (the time the REIT Merger becomes effective being the "Effective Time"),
                                                              --------------   
it being understood that the parties shall cause the Effective Time to occur as
soon as practicable after the Closing Date but in any event at least one day
after the effective time of the OP Merger.

     Section 1.4.  Charter and By-laws.  The articles of incorporation and by-
                   -------------------                                       
laws of Duke, amended and restated substantially in the forms set forth in
Exhibits E and F hereto, shall become the articles of incorporation (the
"Charter") and by-laws (the "By-laws") of the Surviving Corporation upon the
- ---------                    -------                                        
Effective Time until further amended in accordance with applicable Indiana law;
provided, however, that if the Duke Special Charter Proposal (as defined below)
- --------  -------                                                              
is not approved at the Duke Shareholders Meeting (as defined in Section 5.1(b))
by the affirmative vote of at least 80% of Duke's issued and outstanding shares
of capital stock ("80% Duke Approval"), the Charter and By-laws upon the
                   -----------------                                    
Effective Time shall be substantially in the forms set forth in Exhibits G and H
hereto until further amended in accordance with applicable Indiana law.  The
"Duke Special Charter Proposal" is the proposal, to be presented at the Duke
- ------------------------------                                              
Shareholders Meeting, to amend Duke's Charter to (i) increase the size of Duke's

                                       2
<PAGE>
 
Board of Directors to a minimum of five and a maximum of 23 and (ii) delete the
references contained in Article XII of Duke's Charter to Section 7.01 of the
Charter.

     Section 1.5.  Directors.  Immediately following the Effective Time, the
                   ---------                                                
Board of Directors of the Surviving Corporation (the "Board") and certain
                                                      -----              
committees of the Board shall consist of the persons named on Schedule D hereto,
each of whom shall be a member of the class indicated on Schedule D; provided,
                                                                     -------- 
however, that if the Duke Special Charter Proposal is not approved at the Duke
- -------                                                                       
Shareholder Meeting by the 80% Duke Approval, the Board and certain committees
of the Board shall consist immediately following the Effective Time of the
persons named on Schedule E hereto, each of whom shall be a member of the class
indicated on Schedule E.  If any person referred to in the preceding sentence
should for any reason be unable or unwilling to serve, such person's replacement
shall be selected before the Effective Time by mutual agreement of Duke and
Weeks or after the Effective Time by the Board.

     Section 1.6.  Officers.  The executive officers of the Surviving
                   --------                                          
Corporation immediately following the Effective Time shall include the persons
named on Schedule F hereto (or, if any such person should for any reason be
unable or unwilling to serve, such other person or persons as shall be mutually
agreed by Duke and Weeks), each of whom shall hold the position indicated on
Schedule F hereto. If any such person should for any reason be unable or
unwilling to serve, such person's replacement shall be selected before the
Effective Time by mutual agreement of Duke and Weeks or after the Effective Time
by the Board.

                                  ARTICLE II

                          EFFECTS OF THE REIT MERGER;
                           EXCHANGE OF CERTIFICATES
                            ------------------------

     Section 2.1.  Effect on Capital Stock
                   -----------------------

     (a) Capital Stock Owned by Weeks or its Subsidiaries.  As of the Effective
         ------------------------------------------------                      
Time, any shares of capital stock of Weeks that are owned by Weeks or any Weeks
Subsidiary automatically shall be cancelled and retired and all rights with
respect thereto shall cease to exist, and no consideration shall be delivered in
exchange therefor.

     (b) Conversion of Weeks Capital Stock Into Duke Capital Stock.  At the
         ---------------------------------------------------------         
Effective Time, except as provided in Section 2.1(a), (i) each issued and
outstanding share of Weeks Common Stock shall be converted by virtue of the REIT
Merger, automatically and without any action on the part of the holder thereof,
into the right to receive from the Surviving Corporation 1.38 (the "Exchange
                                                                    --------
Ratio") fully paid and nonassessable shares of common stock, par value $.01 per
- -----                                                                          
share, of Duke "Duke Common Stock"), (ii) each issued and outstanding share of
                -----------------                                             
Weeks Series A Preferred Stock shall be converted by virtue of the REIT Merger,
automatically and without any action on the part of the holder thereof, into the
right to receive from the Surviving Corporation one fully paid and nonassessable
preference share (a "Series F Preference Share"), representing 1/1000 of a share
                     -------------------------                                  
of 8.0% Series F Cumulative Redeemable Preferred Stock, par value $.01 per
share, of Duke "Duke Series F Preferred Stock") and (iii) each issued and
                -----------------------------                            
outstanding share of Weeks Series D Preferred Stock (if any) shall be converted,
by virtue of the REIT Merger, automatically and without any action on the part
of the holder thereof, into the right to receive from the Surviving Corporation
one fully paid and nonassessable preference share (a "Series H Preference
                                                      -------------------
Share", and together with the Series F Preference Shares, the "New Duke
                                                               --------
Preference Shares"), representing 1/1000 of a share of 8.625% Series H
- -----------------                                                     
Cumulative Redeemable Preferred Stock, par value $0.01 per share, of Duke "Duke
                                                                           ----
Series H Preferred Stock", and together with the Duke Series F Preferred Stock,
- ------------------------                                                       
the "New Duke Preferred Stock").  At the Effective Time, all shares of Weeks
     ------------------------                                               
Common Stock and 

                                       3
<PAGE>
 
Weeks Preferred Stock outstanding immediately prior to the Effective Time shall
cease to be outstanding and automatically shall be cancelled and retired and all
rights with respect thereto shall cease to exist, and each holder of a
certificate representing any shares of Weeks Common Stock or Weeks Preferred
Stock (a "Certificate") shall cease to have any rights with respect thereto, 
          -----------                                      
except the right to receive, upon surrender of such Certificate in accordance
with Section 2.2(c), a certificate or certificates representing the shares of
Duke Common Stock or New Duke Preference Shares, as applicable, into which those
shares are converted pursuant to this Section 2.1(b) and any cash in lieu of
fractional shares of Duke Common Stock to be issued or paid in consideration
therefor upon surrender of such certificate (the "Merger Consideration") and 
                                                  --------------------
any dividends or other distributions to which such holder is entitled pursuant
to Section 2.2(d), in each case without interest and less any required
withholding taxes. Notwithstanding the foregoing, the rights of each stockholder
of the Surviving Corporation under this Section 2.1 will be subject to the
ownership limitations and other related provisions contained in the Charter.

     (c) Shares of Duke Capital Stock.  Upon the Effective Time, each share of
         ----------------------------                                         
capital stock of Duke outstanding immediately prior to the Effective Time shall
remain outstanding and shall represent one share of validly issued, fully paid
and nonassessable capital stock of the same class and designation.

     Section 2.2.  Exchange of Certificates.
                   ------------------------ 

     (a) Exchange Agent.  Prior to the Effective Time, Duke shall appoint a bank
         --------------                                                         
or trust company that is reasonably acceptable to Weeks to act as exchange agent
(the "Exchange Agent") for the exchange of the Merger Consideration for
      --------------                                                   
Certificates representing issued and outstanding Weeks Common Stock and Weeks
Preferred Stock.

     (b) Duke to Provide Merger Consideration.  Duke shall provide, or cause to
         ------------------------------------                                  
be provided, to the Exchange Agent on and after the Effective Time from time to
time as required pursuant to Section 2.2(c) and 2.2(g), for the benefit of the
holders of Weeks Common Stock and Weeks Preferred Stock, certificates
representing the shares of Duke Common Stock and New Duke Preferred Stock into
which  the issued and outstanding shares of Weeks Common Stock and Weeks
Preferred Stock are converted pursuant to Section 2.1(b), together with the cash
payable in respect of fractional shares pursuant to Section 2.2(g).

     (c) Exchange Procedure.  As soon as reasonably practicable after the
         ------------------                                              
Effective Time, the Exchange Agent shall mail to each holder of record of a
Certificate or Certificates whose shares were converted into the right to
receive the Merger Consideration pursuant to Section 2.1, (i) a letter of
transmittal (which shall specify that delivery shall be effected, and risk of
loss and title to the Certificates shall pass, only upon delivery of the
Certificates to the Exchange Agent and shall be in a form and have such other
provisions as Duke may reasonably specify) and (ii) instructions for use in
effecting the surrender of the Certificates, in exchange for the applicable
Merger Consideration.  Upon surrender of a Certificate for cancellation to the
Exchange Agent or to such other agent or agents as may be appointed by Duke,
together with such letter of transmittal, duly executed, and such other
documents as may reasonably be required by the Exchange Agent, the holder of
such Certificate shall be entitled to receive in exchange therefor the
applicable Merger Consideration and any dividends or other distributions to
which such holder is entitled pursuant to Section 2.2(d), and the Certificate so
surrendered shall forthwith be cancelled.  In the event of a transfer of
ownership of Weeks Common Stock or Weeks Preferred Stock which is not registered
in the transfer records of Weeks, payment may be made to a person other than the
person in whose name the Certificate so surrendered is registered if such
Certificate shall be properly endorsed or otherwise be in proper form for
transfer and the person requesting such payment either shall pay any transfer or
other taxes required by reason of such payment being made to a person other than
the registered holder of such Certificate or establish to the satisfaction of
Duke that such tax or taxes have 

                                       4
<PAGE>
 
been paid or are not applicable. Until surrendered as contemplated by this
Section 2.2, each Certificate shall be deemed at any time after the Effective
Time to represent only the right to receive upon such surrender the applicable
Merger Consideration, without interest, into which the shares theretofore
represented by such Certificate shall have been converted pursuant to Section
2.1 and any dividends or other distributions to which such holder is entitled
pursuant to Section 2.2(d). No interest will be paid or will accrue on the
applicable Merger Consideration upon the surrender of any Certificate or on any
cash payable pursuant to Section 2.2(d) or Section 2.2(g).

     (d) Record Dates; Distributions with Respect to Unexchanged Shares.
         -------------------------------------------------------------- 

         (i) To the extent reasonably necessary to ensure satisfaction of the
requirements of Section 857(a)(1) of the Code for the taxable year of Weeks
ending at the Effective Time, Weeks shall declare a dividend (the "Final Weeks
                                                                   -----------
Dividend") to holders of shares of Weeks Common Stock, the record date for which
- --------                                                                        
shall be the close of business on the last business day prior to the Effective
Time, in an amount equal to the minimum dividend sufficient to permit Weeks to
satisfy such requirements.  If Weeks determines it necessary to declare the
Final Weeks Dividend, it shall notify Duke at least ten (10) days prior to the
date for the Weeks Shareholders Meeting (as defined in Section 5.1(b)), and Duke
shall declare a dividend per share to holders of Duke Common Stock, the record
date for which shall be the close of business on the last business day prior to
the Effective Time, in an amount per share equal to the quotient obtained by
dividing (x) the Final Weeks Dividend per share of Weeks Common Stock paid by
Weeks by (y) the Exchange Ratio.  The dividends payable hereunder to holders of
Weeks Common Stock shall be paid upon presentation of the Certificates of Weeks
Common Stock for exchange in accordance with this Article II.

         (ii) No dividends or other distributions with respect to Duke Common
Stock or New Duke Preferred Stock with a record date after the Effective Time
shall be paid to the holder of any unsurrendered Certificate with respect to the
shares represented thereby, and no cash payment in lieu of fractional shares
shall be paid to any such holder pursuant to Section 2.2(g), in each case until
the surrender of such Certificate in accordance with this Article II. Subject to
the effect of applicable abandoned property, escheat or similar laws, following
surrender of any such Certificate there shall be paid to the holder of such
Certificate without interest, (A) at the time of such surrender, the amount of
any cash payable in lieu of any fractional share of Weeks Common Stock to which
such holder is entitled pursuant to Section 2.2(g) and (B) if such Certificate
is exchangeable for one or more whole shares of Duke Common Stock, or New Duke
Preferred Stock, (x) at the time of such surrender, the amount of dividends or
other distributions with a record date after the Effective Time theretofore paid
with respect to such whole shares of Duke Common Stock or New Duke Preferred
Stock, and (y) at the appropriate payment date, the amount of dividends or other
distributions with a record date after the Effective Time but prior to such
surrender and with a payment date subsequent to such surrender payable with
respect to such whole shares of Duke Common Stock or New Duke Preferred Stock.

     (e) No Further Ownership Rights in Weeks Capital Stock.  All Merger
         --------------------------------------------------             
Consideration paid upon the surrender of Certificates in accordance with the
terms of this Article II (and any cash paid pursuant to Section 2.2(g)) shall be
deemed to have been paid in full satisfaction of all rights pertaining to the
shares of Weeks Common Stock and Weeks Preferred Stock theretofore represented
by such Certificates; subject, however, to the obligation of Weeks to pay,
without interest, any dividends or make any other distributions with a record
date prior to the Effective Time which may have been declared or made by Weeks
on such shares in accordance with the terms of this Agreement or prior to the
date of this Agreement and which remain unpaid at the Effective Time and have
not been paid prior to such surrender, and there shall be no further
registration of transfers on the stock transfer books of Weeks of the shares of
Weeks Common Stock or Weeks Preferred Stock which were outstanding immediately
prior 

                                       5
<PAGE>
 
to the Effective Time. If, after the Effective Time, Certificates are properly
presented to the Surviving Corporation they shall be cancelled and exchanged as
provided in this Article II.

     (f) Unclaimed Merger Consideration.  Any portion of the Merger
         ------------------------------                            
Consideration delivered to the Exchange Agent pursuant to this Agreement that
remains unclaimed for six months after the Effective Time shall be redelivered
by the Exchange Agent to the Surviving Corporation, upon demand, and any holders
of Certificates who have not theretofore complied with Section 2.2(b) shall
thereafter look only to the Surviving Corporation for delivery of the Merger
Consideration, subject to applicable abandoned property, escheat and other
similar laws.  The Surviving Corporation shall have no liability to any holder
of shares of Weeks Common Stock or Weeks Preferred Stock for Merger
Consideration delivered to a public official pursuant to any applicable
abandoned property, escheat or similar law.  Any Merger Consideration remaining
unclaimed by any holder of shares of Weeks Common Stock or Weeks Preferred Stock
on the day immediately prior to the time such amounts otherwise would escheat to
or become the property of any governmental entity shall, to the extent permitted
by law, become the property of the Surviving Corporation, free and clear of any
claim or interest of any Persons previously entitled thereto.

     (g)  No Fractional Shares.
          -------------------- 

          (i) No certificates or scrip representing fractional shares of Duke
Common Stock shall be issued upon the surrender for exchange of Certificates,
and such fractional share interests will not entitle the owner thereof to vote,
to receive dividends or to any other rights of a stockholder of Duke.

          (ii) Notwithstanding any other provision of this Agreement, each
holder of shares of Weeks Common Stock who would otherwise have been entitled to
receive a fraction of a share of Duke Common Stock (after taking into account
all Certificates delivered by such holder) shall receive, upon surrender of such
holder's Certificates in accordance with Section 2.1, a cash payment in lieu of
such fractional shares of Duke Common Stock equal to the same fractional
proportion of the arithmetic mean of the closing sales price of a share of Duke
Common Stock on the New York Stock Exchange (the "NYSE") on each of the ten
                                                  ----                     
trading days immediately preceding the Closing Date.

     (h) Withholding.  The Surviving Corporation or the Exchange Agent shall be
         -----------                                                           
entitled to deduct and withhold from the Merger Consideration otherwise payable
pursuant to this Agreement to any holder of shares of Weeks Common Stock or
Weeks Preferred Stock such amounts as the Surviving Corporation or the Exchange
Agent is required to deduct and withhold with respect to the making of such
payment under the Code, or any provision of state, local or foreign tax law.  To
the extent that amounts are so withheld by the Surviving Corporation or the
Exchange Agent, such withheld amounts shall be treated for all purposes of this
Agreement as having been paid to the holder of the shares of Weeks Common Stock
or Weeks Preferred Stock, as the case may be, in respect of which such deduction
and withholding was made by the Surviving Corporation or the Exchange Agent.

     (i) No Dissenters' Rights.  No dissenters' or appraisal rights shall be
         ---------------------                                              
available with respect to the REIT Merger.

                                  ARTICLE III

                        REPRESENTATIONS AND WARRANTIES
                        ------------------------------

     Section 3.1.  Representations and Warranties of Weeks.  Except as set forth
                   ---------------------------------------                      
in the letter of even date herewith (with sections organized in accordance with
Section 9.9) signed by the President or Chief Executive Officer and the Chief
Financial Officer of Weeks and delivered to Duke prior to the execution hereof
(the "Weeks Disclosure Letter"), Weeks represents and warrants to Duke as
      -----------------------                                            
follows:

                                       6
<PAGE>
 
     (a) Organization, Standing and Corporate Power of Weeks.  Weeks is a
         ---------------------------------------------------             
corporation duly organized and validly existing under the laws of Georgia and
has the requisite corporate power and authority to carry on its business as now
being conducted.  Weeks is duly qualified or licensed to do business and is in
good standing in each jurisdiction in which the nature of its business or the
ownership, leasing of its properties or management of properties for others
makes such qualification or licensing necessary, other than in such
jurisdictions where the failure to be so qualified or licensed, individually or
in the aggregate, would not have a material adverse effect on the business,
properties, financial condition or results of operations of Weeks and the Weeks
Subsidiaries taken as a whole (a "Weeks Material Adverse Effect").
                                  -----------------------------   

     (b) Weeks Subsidiaries; Interests in Other Persons.
         ---------------------------------------------- 

         (i) Section 3.1(b)(i) of the Weeks Disclosure Letter sets forth each
Weeks Subsidiary and the ownership interest therein of Weeks and each other
Weeks Subsidiary. All the outstanding shares of capital stock of each Weeks
Subsidiary that is a corporation have been validly issued and are fully paid and
nonassessable and are not subject to any preemptive rights, and are owned by
Weeks, by another Weeks Subsidiary or by Weeks and another Weeks Subsidiary,
free and clear of all pledges, claims, liens, charges, encumbrances and security
interests of any kind or nature whatsoever (collectively, "Liens"), and equity
                                                           -----              
interests in each Weeks Subsidiary, including Weeks OP, that is a partnership,
limited liability company or trust are owned by Weeks, by another Weeks
Subsidiary or by Weeks and another Weeks Subsidiary free and clear of all Liens.
Each Weeks Subsidiary that is a corporation is duly incorporated and validly
existing under the laws of its jurisdiction of incorporation and has the
requisite corporate power and authority to carry on its business as now being
conducted and each Weeks Subsidiary, including Weeks OP, that is a partnership,
limited liability company or trust is duly organized and validly existing under
the laws of its jurisdiction of organization and has the requisite power and
authority to carry on its business as now being conducted.  Each Weeks
Subsidiary, including Weeks OP, is duly qualified or licensed to do business and
is in good standing in each jurisdiction in which the nature of its business or
the ownership, leasing of its properties or management of properties for others
makes such qualification or licensing necessary, other than in such
jurisdictions where the failure to be so qualified or licensed, individually or
in the aggregate, would not have a Weeks Material Adverse Effect.

         (ii) Except for the capital stock of, or other equity interests in, the
Weeks Subsidiaries and the other interests disclosed in Section 3.1(b)(ii) of
the Weeks Disclosure Letter (the "Weeks Other Interests"), Weeks does not own,
                                  ---------------------                       
directly or indirectly (including through any Weeks Subsidiary), any capital
stock or other ownership interest, with a fair market value as of the date of
this Agreement greater than $250,000 in any Person or which represents 5% or
more of the outstanding voting power, capital stock or other ownership interest
of any class in any Person.  Neither Weeks nor any Weeks Subsidiary is in
material default of any provision of any organizational documents governing or
otherwise relating to its rights in any Weeks Other Interest.  All such
organizational documents are set forth in Section 3.1(b)(ii) of the Weeks
Disclosure Letter and are in full force and effect.

     (c) Capital Structure.  The authorized capital stock of Weeks consists of
         -----------------                                                    
100,000,000 shares of Weeks Common Stock and 20,000,000 shares of preferred
stock, par value $.01 per share.  On the date hereof, (i) 19,743,232 shares of
Weeks Common Stock and 6,000,000 shares of Weeks Series A Preferred Stock
constitute all of the issued and outstanding capital stock of Weeks, (ii) 47,889
shares of Weeks Common Stock were available for issuance under Weeks' 1994
Incentive Stock Plan, (iii) 286,000 shares of Weeks Common Stock were available
for issuance under Weeks' 1998 Incentive Stock Plan (the 1994 Incentive Stock
Plan and the 1998 Incentive Stock Plan are collectively referred to as the
                                                                          
"Weeks Stock Plans"), (iv) 32,309 shares of Weeks Common Stock were issued but
- ------------------                                                            
had not yet vested under restricted 

                                       7
<PAGE>
 
stock grants made pursuant to the Weeks Stock Plans, (v) 1,908,265 shares of
Weeks Common Stock were reserved for issuance upon exercise of outstanding stock
options to purchase shares of Weeks Common Stock granted to employees and
directors of Weeks under the Weeks Stock Plans (the "Weeks Stock Options"), (vi)
                                                     ------------------- 
7,324,677 shares of Weeks Common Stock were reserved for issuance upon exchange
of units of limited partnership interest in Weeks OP "Weeks OP Units") for
                                                      --------------
shares of Weeks Common Stock pursuant to the agreements listed in Section 3.1(c)
of the Weeks Disclosure Letter (the "Weeks Exchange Agreements"), (vii)
                                     -------------------------- 
1,046,729 shares of Weeks Common Stock and 1,400,000 shares of Weeks Series A
Preferred Stock were reserved for issuance upon the exercise of the warrants
issued pursuant to the Warrant Agreement, dated November 6, 1998, between Weeks
and AEW Targeted Securities Fund, L.P. (the "AEW Warrant"), (viii) 350,000
                                             -----------       
shares of Weeks Common Stock were reserved for issuance upon the exercise of the
warrants issued pursuant to the Stock Purchase Agreement, dated February 24,
1998, among Weeks and Armando Codina, Codina Group, Inc. and St. Joe Corporation
(the "Codina Warrants"), (ix) 1,400,000 shares of Weeks Series A Preferred Stock
      ---------------        
and 1,046,729 shares of Weeks Common Stock were reserved for issuance upon the
redemption and exchange of 1,400,000 Series C Preferred Weeks OP Units, (x)
100,000 shares of Weeks Series B Preferred Stock were reserved for issuance
pursuant to the Rights Agreement (as defined in Section 3.1(f)) and (xi)
2,600,000 shares of Weeks Series D Preferred Stock were reserved for issuance
upon the exchange of 2,600,000 Series D Preferred Weeks OP Units. On the date of
this Agreement, except as set forth above in this Section 3.1(c), no shares of
capital stock or other voting securities of Weeks were issued, reserved for
issuance or outstanding. There are no outstanding stock appreciation rights
relating to the capital stock of Weeks. All outstanding shares of capital stock
of Weeks are duly authorized, validly issued, fully paid and nonassessable and
not subject to preemptive rights. There are no bonds, debentures, notes or other
indebtedness of Weeks having the right to vote (or convertible into, or
exchangeable for, securities having the right to vote) on any matters on which
shareholders of Weeks may vote. Weeks GP Holdings, Inc., a wholly owned
subsidiary of Weeks "Weeks GP") is the sole general partner of Weeks OP and 
                     --------  
holds a 1.247% general partner interest in Weeks OP. Weeks LP Holdings, Inc., a
wholly owned subsidiary of Weeks "Weeks LP"), holds a 71.693% limited partner
                                  --------
interest in Weeks OP. As of the date hereof, 27,067,909 common Weeks OP Units,
6,000,000 8.0% Series A Cumulative Redeemable Preferred OP Units, 1,400,000 8.0%
Series C Preferred OP Units and 2,600,000 8.625% Series D Cumulative Redeemable
Preferred OP Units are validly issued and outstanding, fully paid and
nonassessable and not subject to preemptive rights. The common Weeks OP Units
not held by Weeks or any Weeks Subsidiary are exchangeable for Weeks Common
Stock on a one-for-one basis into an aggregate of 7,324,677 shares of Weeks
Common Stock in accordance with the terms of the Weeks Exchange Agreements,
subject to adjustment as provided in the Weeks Exchange Agreements. The Series C
Preferred Weeks OP Units are subject to redemption or exchange on a one-for-one
basis into an aggregate of 1,400,000 shares of Weeks Series A Preferred Stock
pursuant to the terms of the Series C Preferred Weeks OP Units. The Series D
Weeks Preferred OP Units are exchangeable on a one-for-one basis into an
aggregate of 2,600,000 shares, Weeks Series D Preferred Stock pursuant to the
terms of the Series D Preferred Weeks OP Units. Section 3.1(c) of the Weeks
Disclosure Letter sets forth the name, number and class of Weeks OP Units and
the percentage interest of each partner in Weeks OP. Except as set forth in this
Section 3.1(c), and except for the Weeks Stock Options, there are no outstanding
securities, options, warrants, calls, rights, commitments, agreements,
arrangements or undertakings of any kind to which Weeks or any Weeks Subsidiary,
including Weeks OP, is a party or by which such entity is bound, obligating
Weeks or any Weeks Subsidiary, including Weeks OP, to issue, deliver or sell, or
cause to be issued, delivered or sold, additional shares of capital stock,
voting securities or other ownership interests of Weeks or any Weeks Subsidiary,
including Weeks OP, or obligating Weeks or any Weeks Subsidiary, including Weeks
OP, to issue, grant, extend or enter into any such security, option, warrant,
call, right, commitment, agreement, arrangement or undertaking other than to
Weeks or a Weeks Subsidiary. Except as set forth in this Section 3.1(c), there
are no outstanding contractual obligations of Weeks or any Weeks Subsidiary,
including Weeks OP, to repurchase, redeem or otherwise acquire any shares of
capital stock of Weeks or any capital stock, voting securities or other
ownership interests in 

                                       8
<PAGE>
 
Weeks or any Weeks Subsidiary, including Weeks OP, or make any material
investment (in the form of a loan, capital contribution or otherwise) in any
Person (other than a Weeks Subsidiary, including Weeks OP).

     (d) Authority; Noncontravention; Consents.  Weeks has the requisite
         -------------------------------------                          
corporate power and authority to enter into this Agreement and, subject to
receipt of the Weeks Shareholder Approvals (as defined in Section 3.1(v)), to
consummate the transactions contemplated by this Agreement to which Weeks is a
party.  Weeks GP, as Weeks OP's sole general partner, has the requisite power
and authority to enter into the OP Merger Agreement and to consummate the
transactions contemplated by the OP Merger Agreement.  The execution and
delivery of this Agreement and any other agreement contemplated by this
Agreement by Weeks and the consummation by Weeks of the transactions
contemplated hereby to which Weeks is a party have been duly authorized by all
necessary corporate action on the part of Weeks, subject to receipt of the Weeks
Shareholder Approvals.  The execution and delivery of the OP Merger Agreement
and any other agreement contemplated by this Agreement or the OP Merger
Agreement by Weeks GP, as the sole general partner of Weeks OP, and by Weeks OP
and the consummation by Weeks OP of the transactions contemplated hereby and by
the OP Merger Agreement have been duly authorized by all necessary partnership
action.  This Agreement, the OP Merger Agreement and the other agreements
contemplated by this Agreement have been duly executed and delivered by Weeks,
Weeks GP or Weeks OP, as the case may be, and constitute valid and binding
obligations of Weeks, Weeks GP or Weeks OP, as the case may be, enforceable
against Weeks, Weeks GP or Weeks OP in accordance with their terms.  The
execution and delivery of this Agreement, the OP Merger Agreement and the other
agreements contemplated by this Agreement by Weeks, Weeks GP and Weeks OP do
not, and the consummation of the transactions contemplated hereby and thereby to
which either Weeks or Weeks OP is a party and compliance by Weeks, Weeks GP or
Weeks OP with the provisions of this Agreement, the OP Merger Agreement and the
other agreements contemplated by this Agreement and the OP Merger Agreement will
not, conflict with, or result in any violation of, or default (with or without
notice or lapse of time, or both) under, or give rise to a right of termination,
cancellation or acceleration of any material obligation or to loss of a material
benefit under, or result in the creation of any Lien upon any of the properties
or assets of Weeks or any Weeks Subsidiary (including Weeks OP) under, (i) the
articles of incorporation or by-laws of Weeks or the comparable articles of
incorporation or organizational documents or partnership or similar agreement
(as the case may be) of any Weeks Subsidiary, (ii) any loan or credit agreement,
note, bond, mortgage, indenture, reciprocal easement agreement, lease or other
agreement, instrument, permit, concession, contract, franchise or license
applicable to Weeks or any Weeks Subsidiary (including Weeks OP) or their
respective properties or assets or (iii) subject to the governmental filings and
other matters referred to in the following sentence, any judgment, order,
decree, statute, law, ordinance, rule or regulation (collectively, "Laws")
                                                                    ----  
applicable to Weeks or any Weeks Subsidiary (including Weeks OP), or their
respective properties or assets, other than, in the case of clause (ii) or
(iii), any such conflicts, violations, defaults, rights or Liens that
individually or in the aggregate would not (x) have a Weeks Material Adverse
Effect or (y) materially delay or prevent the consummation of the REIT Merger or
the OP Merger or the other transactions contemplated by this Agreement or the OP
Merger Agreement.  No consent, approval, order or authorization of, or
registration, declaration or filing with, any federal, state or local government
or any court, administrative or regulatory agency or commission or other
governmental authority or agency (a "Governmental Entity"), is required by or
                                     -------------------                     
with respect to Weeks or any Weeks Subsidiary (including Weeks OP) in connection
with the execution and delivery of this Agreement, the OP Merger Agreement or
the other agreements contemplated by this Agreement by Weeks or Weeks OP, as the
case may be, or the consummation by Weeks and the Weeks Subsidiaries (including
Weeks OP) of any of the other transactions contemplated hereby and thereby,
except for (i) the filing with the Securities and Exchange Commission (the
"SEC") of (x) a joint proxy statement relating to the approval by Weeks'
 ---                                                                    
shareholders and Duke's shareholders of the transactions contemplated by this
Agreement (as amended or supplemented from time to time, the "Proxy Statement")
                                                              ---------------  
and a registration statement relating to the 

                                       9
<PAGE>
 
issuance of the Merger Consideration ("Registration Statement"), and (y) such
                                       ---------------------- 
reports under Section 13 of the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), as may be required in connection with this Agreement and the 
 ------------          
transactions contemplated by this Agreement, (ii) the filing of the Articles of
Merger for the REIT Merger with the Secretary of State of Indiana and the
Secretary of State of Georgia and the filing of a certificate of merger for the
OP Merger with the Secretary of State of Indiana and the Secretary of State of
Georgia, (iii) such filings as may be required in connection with the payment of
any Transfer and Gains Taxes (as defined below), (iv) the termination or
expiration of all waiting periods under the Hart-Scott-Rodino Antitrust
Improvements Act of 1976 (the "HSR Act") and (v) such other consents, approvals,
                               -------  
orders, authorizations, registrations, declarations and filings as are set forth
in Section 3.1(d) of the Weeks Disclosure Letter or (A) as may be required under
(x) federal, state, local or foreign environmental laws or (y) the "blue sky"
laws of various states or (B) which, if not obtained or made, would not prevent
or delay in any material respect the consummation of any of the transactions
contemplated by this Agreement or the OP Merger Agreement or otherwise prevent
Weeks or Weeks OP from performing their obligations under this Agreement or the
OP Merger Agreement in any material respect or have, individually or in the
aggregate, a Weeks Material Adverse Effect.

     (e) SEC Documents; Financial Statements; Undisclosed Liabilities.  Weeks
         ------------------------------------------------------------        
and Weeks OP have filed all required reports, schedules, forms, statements and
other documents with the SEC since January 1, 1995 and August 4, 1997,
respectively (collectively, the "Weeks SEC Documents").  All of the Weeks SEC
                                 -------------------                         
Documents (other than preliminary materials or materials that were subsequently
amended), as of their respective filing dates, complied in all material respects
with all applicable requirements of the Securities Act of 1933, as amended (the
"Securities Act") and the Exchange Act and, in each case, the rules and
 --------------                                                        
regulations promulgated thereunder applicable to such Weeks SEC Documents.  None
of the Weeks SEC Documents at the time of filing contained any untrue statement
of a material fact or omitted to state any material fact required to be stated
therein or necessary in order to make the statements therein, in light of the
circumstances under which they were made, not misleading, except to the extent
such statements have been amended, modified or superseded by later filed Weeks
SEC Documents.  None of the Weeks SEC Documents is the subject of any
confidential treatment request by Weeks or Weeks OP.  Section 3.1(e) of the
Weeks Disclosure Letter lists all of the Weeks SEC Documents filed with the SEC
since January 1, 1998.  The consolidated financial statements of Weeks and Weeks
OP, as applicable, included in the Weeks SEC Documents complied as to form in
all material respects with applicable accounting requirements and the published
rules and regulations of the SEC with respect thereto, have been prepared in
accordance with generally accepted accounting principles "GAAP") (except, in the
                                                          ----                  
case of interim financial statements, as permitted by the applicable rules and
regulations of the SEC) applied on a consistent basis during the periods
involved (except as may be indicated in the notes thereto) and fairly presented
in all material respects, in accordance with the applicable requirements of
GAAP, the consolidated financial position of Weeks and the Weeks Subsidiaries
taken as a whole, as of the dates thereof and the consolidated results of
operations and cash flows for the periods then ended (subject, in the case of
interim financial statements, to normal year-end adjustments).  Except as set
forth in the Weeks SEC Documents filed with the SEC prior to the date of this
Agreement, neither Weeks nor any Weeks Subsidiary has any liabilities or
obligations of any nature (whether accrued, absolute, contingent or otherwise)
required by GAAP to be set forth on a consolidated balance sheet of Weeks or in
the notes thereto and which, individually or in the aggregate, would have a
Weeks Material Adverse Effect.

     (f) Absence of Certain Changes or Events.  Except as disclosed in the Weeks
         ------------------------------------                                   
SEC Documents filed with the SEC prior to the date of this Agreement, since
December 31, 1997 (the "Weeks Financial Statement Date") and to the date of this
                        ------------------------------                          
Agreement, Weeks and the Weeks Subsidiaries have conducted their business only
in the ordinary course and there has not been (i) any change that would have a
Weeks Material Adverse Effect (a "Weeks Material Adverse Change"), nor has there
                                  -----------------------------                 
been any occurrence or circumstance that with the passage of time would
reasonably be expected to result in a Weeks Material Adverse Change, (ii) any
declaration, setting aside or payment of any dividend or other 

                                       10
<PAGE>
 
distribution (whether in cash, stock or property) with respect to any of Weeks'
capital stock or any Weeks OP Units, except for (A) regular quarterly dividends
(in the case of Weeks) not in excess of $.505 per share of Weeks Common Stock
and regular quarterly dividends on Weeks Series A Preferred Stock not in excess
of $.50 per share of Weeks Series A Preferred Stock, (B) the payment of a
preferred stock purchase right dividend pursuant to a Rights Agreement between
Weeks and Wachovia Bank, N.A. dated May 20, 1998 (the "Rights Agreement"), (C)
                                                       ----------------
the Final Weeks Dividend and the corresponding Weeks OP distribution, (D)
regular quarterly distributions (in the case of Weeks OP) of $.505 per Weeks
Common OP Unit, $.50 per Series A Preferred OP Unit, $.50 per Series C Preferred
OP Unit and $.5390625 per Series D Preferred OP Unit and (E) any distributions
by any Weeks Subsidiaries (other than Weeks OP) to other Weeks Subsidiaries or
to Weeks, in each case, with customary record and payment dates, (iii) any
split, combination or reclassification of any of Weeks' capital stock or any
issuance or the authorization of any issuance of any other securities in respect
of, in lieu of or in substitution for, or giving the right to acquire by
exchange or exercise, shares of its capital stock or any issuance of an
ownership interest in, any Weeks Subsidiary, (iv) any damage, destruction or
loss, whether or not covered by insurance, that has or would have a Weeks
Material Adverse Effect, or (v) any change in accounting methods, principles or
practices by Weeks materially affecting its assets, liabilities or business,
except insofar as may have been disclosed in the Weeks SEC Documents filed with
the SEC prior to the date of this Agreement, or required by a change in GAAP.

     (g) Litigation.  Except as disclosed in the Weeks SEC Documents filed with
         ----------                                                            
the SEC prior to the date of this Agreement, and other than personal injury and
other routine tort litigation arising from the ordinary course of operations of
Weeks and the Weeks Subsidiaries which are covered by adequate insurance, there
is no suit, action or proceeding pending or, to the knowledge of Weeks,
threatened against or affecting Weeks or any Weeks Subsidiary that, individually
or in the aggregate, could reasonably be expected to (i) have a Weeks Material
Adverse Effect or (ii) prevent the consummation of any of the transactions
contemplated herein, nor is there any judgment, decree, injunction, rule or
order of any Governmental Entity or arbitrator outstanding against Weeks or any
Weeks Subsidiary having, or which, insofar as reasonably can be foreseen, in the
future would have, any such effect.

     (h) Absence of Changes in Benefit Plans; ERISA Compliance.
         ----------------------------------------------------- 

         (i) Except as disclosed in the Weeks SEC Documents filed with the SEC
prior to the date of this Agreement, since the Weeks Financial Statement Date,
there has not been any adoption or amendment in any material respect, or the
undertaking of any additional obligation, by Weeks, any Weeks Subsidiary or any
Weeks ERISA Affiliate (as defined below) of any Weeks Benefit Plan (as defined
below). For purposes of this Agreement, "Weeks Benefit Plan" shall mean any
Employee Plan sponsored or maintained by Weeks, any Weeks Subsidiary or any
Weeks ERISA Affiliate, or with respect to which Weeks, any Weeks Subsidiary or
any Weeks ERISA Affiliate has any obligation to contribute, has liability under
or is otherwise a party to, or which otherwise provides benefits for any current
or former employees, officers, directors or other independent contractors (or
their dependents and beneficiaries) of Weeks or any Weeks Subsidiary. For
purposes of this Agreement, "Weeks ERISA Affiliate" means any entity required to
be aggregated with any of Weeks or any Weeks Subsidiary under Sections 414(b),
(c), (m) or (o) of the Code or Section 4001 of the Employee Retirement Income
Security Act of 1974, as amended "ERISA"). Section 3.1(h)(i) of the Weeks
                                  -----                                   
Disclosure Letter sets forth each Weeks Benefit Plan.

         (ii) Except as described in the Weeks SEC Documents filed with the SEC
prior to the date of this Agreement or as would not have a Weeks Material
Adverse Effect, (A) all Weeks Benefit Plans, including any such plan that is an
"employee benefit plan" as defined in Section 3(3) of ERISA, are in compliance
with the terms of such plan and all applicable requirements of law, including
ERISA and the Code and, without limitation, the requirements of ERISA and all
tax rules for which favorable tax 

                                       11
<PAGE>
 
treatment is intended, and (B) there are no liabilities or obligations with
respect to any such Weeks Benefit Plan, whether accrued, contingent or otherwise
(other than obligations by Weeks and the Weeks Subsidiaries to make
contributions, and for such plan to pay benefits and administrative costs,
incurred in the ordinary course), nor to the knowledge of Weeks are any such
liabilities or obligations expected to be incurred. The execution of, and
performance of the transactions contemplated in, this Agreement will not (either
alone or together with the occurrence of any additional or subsequent events)
constitute an event under any Weeks Benefit Plan, policy, program, arrangement
or agreement, trust or loan that will or may result in any payment (whether of
severance pay or otherwise), acceleration, forgiveness of indebtedness, vesting,
distribution, increase in benefits or obligation to fund benefits with respect
to any employee or director, will not result in any "golden parachute payments"
being due (as defined for purposes of Section 280G of the Code), or result in
any breach or violation of, or a default under, any of the Weeks Benefit Plans.
The only severance agreements or severance policies applicable to Weeks or the
Weeks Subsidiaries are the agreements and policies specifically referred to in
Section 3.1(h)(ii) of the Weeks Disclosure Letter.

          (iii) Without limiting the foregoing, each Weeks Benefit Plan which is
intended to be tax-qualified under Section 401(a) of the Code has been
determined by the IRS to be so qualified and such determination has not been
modified, revoked or limited, and no circumstances have occurred that would
adversely affect the tax-qualified status of any such plan.  No Weeks Benefit
Plan is or has ever been subject to Part III of Subtitle B of Title I of ERISA
or Title IV of ERISA or Section 412 of the Code.  None of Weeks or any Weeks
Subsidiary, or any "party in interest" (as defined in Section 3(14) of ERISA) or
any "disqualified person" (as defined in Section 4975 of the Code) with respect
to any Weeks Benefit Plan, has engaged in a non-exempt "prohibited transaction"
within the meaning of Section 4975 of the Code or Section 406 of ERISA that
would have a Weeks Material Adverse Effect.

     (i)  Taxes.
          ----- 

          (i)   Each of Weeks and each Weeks Subsidiary (including Weeks OP) has
timely filed all Tax Returns and reports required to be filed by it (after
giving effect to any filing extension properly granted by a Governmental Entity
having authority to do so). Each such Tax Return is true, correct and complete
in all material respects. Weeks and each Weeks Subsidiary (including Weeks OP)
have paid (or Weeks has paid on their behalf), within the time and manner
prescribed by law, all Taxes that are due and payable. The Tax Returns of Weeks
and each Weeks Subsidiary have not been audited by any Governmental Entity
responsible for tax matters (a "Taxing Authority"). There are no Tax liens upon
                                ---------------- 
the assets of Weeks or any Weeks Subsidiary other than liens for Taxes not yet
due. The most recent financial statements contained in the Weeks SEC Documents
filed with the SEC prior to the date of this Agreement reflect an adequate
reserve for all material Taxes payable by Weeks and by each Weeks Subsidiary for
all taxable periods and portions thereof through the date of such financial
statements. Since the Weeks Financial Statement Date, Weeks has incurred no
liability for federal taxes, other than withholding and employment taxes, under
the Code or IRS Notice 88-19. To the knowledge of Weeks, no event has occurred,
and no condition or circumstance exists, which presents a material risk that any
material Tax described in the preceding sentence will be imposed upon Weeks. No
deficiencies for any Taxes have been proposed, asserted or assessed against
Weeks or any of the Weeks Subsidiaries, and no requests for waivers of the time
to assess any such Taxes have been granted or are pending. As used in this
Agreement, "Taxes" or "Tax" shall mean any federal, state, local or foreign
            -----      ---                                                 
income, gross receipts, license, payroll, employment withholding, property,
recording, stamp, sales, excise or other tax or governmental charges of any
nature whatsoever, together with any penalties, interest or additions thereto
and "Tax Return" shall mean any return, declaration, report, claim for refund,
     ----------                                                               
or information return or statement relating to Taxes, including any schedule or
attachment thereto, and including any amendment thereof.

                                       12
<PAGE>
 
          (ii)  Weeks (A) for each taxable year beginning with the taxable year
ending on December 31, 1994, has been subject to taxation as a REIT within the
meaning of the Code and has satisfied the requirements to qualify as a REIT for
such years, (B) has operated, and intends to continue to operate, in such a
manner as to qualify as a REIT through the end of its taxable year ending at the
Effective Time, and (C) has not taken or omitted to take any action which could
reasonably be expected to result in a challenge to its status as a REIT, and no
such challenge is pending or to Weeks' knowledge, threatened. Weeks OP has at
all times, and each other Weeks Subsidiary which is a partnership or files Tax
Returns as a partnership or limited liability company for federal income tax
purposes has since its acquisition by Weeks been classified for federal income
tax purposes as a partnership or disregarded entity and not as an association
taxable as a corporation, or a "publicly traded partnership" within the meaning
of Section 7704(b) of the Code that is treated as a corporation for federal
income tax purposes under Section 7704(a) of the Code. Neither Weeks nor any
Weeks Subsidiary holds any asset (x) the disposition of which would be subject
to rules similar to Section 1374 of the Code as announced in IRS Notice 88 19 or
(y) that is subject to a consent filed pursuant to Section 341(f) of the Code
and the regulations thereunder.

          (iii) As of the date hereof, Weeks does not have any earnings and
profits attributable to Weeks or any other corporation in any non-REIT year
within the meaning of Section 857 of the Code.

          (iv)  To the best knowledge of Weeks, Weeks qualifies as a
"domestically-controlled" REIT within the meaning of Section 897(h)(4)(B) of the
Code, as of the date hereof.

     (j)  No Loans or Payments to Employees, Officers or Directors.  Except as
          --------------------------------------------------------            
disclosed in the Weeks SEC Documents or as otherwise specifically provided for
in this Agreement, there is no (i) loan outstanding from or to any employee or
director, (ii) employment or consulting contracts, (iii) agreements requiring
payments to be made on a change of control or otherwise as a result of the
consummation of the REIT Merger, the OP Merger or any of the other transactions
contemplated by this Agreement or the OP Merger Agreement with respect to any
employee, officer or director of Weeks or any Weeks Subsidiary or (iv) any
agreement to appoint or nominate any person as a director of Weeks.

     (k)  Brokers; Schedule of Fees and Expenses.  No broker, investment banker,
          --------------------------------------                                
financial advisor or other person, other than Goldman, Sachs & Co., the fees and
expenses of which, as set forth in a letter agreement between Weeks and such
financial advisor, have previously been disclosed to Duke and will be paid by
Weeks, is entitled to any broker's, finder's, financial advisor's or other
similar fee or commission in connection with the REIT Merger or the OP Merger or
any of the other transactions contemplated by this Agreement or the OP Merger
Agreement based upon arrangements made by or on behalf of Weeks or any Weeks
Subsidiary.

     (l)  Compliance with Laws.  Except as disclosed in the Weeks SEC Documents
          --------------------                                                 
filed with the SEC prior to the date of this Agreement, neither Weeks nor any of
the Weeks Subsidiaries has violated or failed to comply with any statute, law,
ordinance, regulation, rule, judgment, decree or order of any Governmental
Entity applicable to its business, properties or operations, except for
violations and failures to comply that would not, individually or in the
aggregate, reasonably be expected to result in a Weeks Material Adverse Effect.

     (m)  Contracts; Debt Instruments.
          --------------------------- 

          (i) Neither Weeks nor any Weeks Subsidiary has received written notice
that it is in violation of or in default under, in any material respect (nor
does there exist any condition which upon the passage of time or the giving of
notice or both would cause such a violation of or default under), any material
loan or credit agreement, note, bond, mortgage, indenture, lease, permit,
concession, franchise or 

                                       13
<PAGE>
 
license, or any agreement to acquire real property, or any other material
contract, agreement, arrangement or understanding, to which it is a party or by
which it or any of its properties or assets is bound, except for violations or
defaults that would not, individually or in the aggregate, result in a Weeks
Material Adverse Effect.

          (ii)  Section 3.1(m)(ii) of the Weeks Disclosure Letter sets forth (A)
a detailed list of all indebtedness of Weeks or any of the Weeks Subsidiaries,
other than indebtedness payable to Weeks or a wholly owned Weeks Subsidiary, in
an aggregate principal amount in excess of $5,000,000 per item is outstanding or
may be incurred and (B) the respective principal amounts outstanding thereunder
on December 31, 1998. For purposes of this Section 3.1(m)(ii) and Section
3.2(m)(ii), "indebtedness" shall mean, with respect to any person, without
duplication, (A) all indebtedness of such person for borrowed money, whether
secured or unsecured, (B) all obligations of such person under conditional sale
or other title retention agreements relating to property purchased by such
person, (C) all capitalized lease obligations of such person, (D) all
obligations of such person under interest rate or currency hedging transactions
(valued at the termination value thereof), and (E) all guarantees of such person
of any such indebtedness of any other person.

          (iii) Neither Weeks nor any Weeks Subsidiary has entered into or is
subject, directly or indirectly, to any Weeks Tax Protection Agreements.  As
used herein, a "Weeks Tax Protection Agreement" is an agreement, oral or
                ------------------------------                          
written, (A) that has as one of its purposes to permit a Person to take the
position that such Person could defer federal taxable income attributable to the
acquisition or ownership of Weeks OP Units or an interest in any other Weeks
Subsidiary that is treated as a partnership for federal income tax purposes, and
(B) that (i) prohibits or restricts in any manner the disposition of any assets
of Weeks or any Weeks Subsidiary, (ii) requires that Weeks or any Weeks
Subsidiary maintain, increase or put in place, or replace, indebtedness, whether
or not secured by one or more of the Weeks Properties, or (iii) requires that
Weeks or any Weeks Subsidiary offer to any person or entity at any time the
opportunity to guarantee or otherwise assume, directly or indirectly, the risk
of loss for federal income tax purposes for indebtedness or other liabilities of
Weeks or any Weeks Subsidiary.

     (n)  OP Agreement.  The Agreement of Limited Partnership of Weeks OP, as
          ------------                                                       
amended through the date hereof  (the "Weeks OP Agreement") has been duly
                                       ------------------                
authorized, executed and delivered by Weeks GP and Weeks LP.  Assuming due
execution by the limited partners of Weeks OP, the Weeks OP Agreement
constitutes a valid and binding obligation of Weeks GP and Weeks LP, enforceable
against Weeks GP and Weeks LP in accordance with its terms.

     (o)  Environmental Matters.  Except as disclosed in Section 3.1(o) of the
          ---------------------                                               
Weeks Disclosure Letter, each of Weeks and each Weeks Subsidiary has obtained
all licenses, permits, authorizations, approvals and consents from Governmental
Entities which are required of Weeks and each Weeks Subsidiary in respect of its
business, operations, assets or properties under any applicable Environmental
Law (as defined below) and each of Weeks and each Weeks Subsidiary is in
compliance in all respects with the terms and conditions of all such licenses,
permits, authorizations, approvals and consents and with its obligations under
any applicable Environmental Law, except for such failures to comply which would
not, individually or in the aggregate, have a Weeks Material Adverse Effect.
Except as disclosed in Section 3.1(o) of the Weeks Disclosure Letter or in the
environmental audits/reports listed thereon:

          (i)   No Order has been issued that is still in effect, no complaint
has been filed that has not been resolved, no penalty has been assessed that has
not been paid and no investigation or review is pending or, to the Knowledge of
Weeks and its Subsidiaries, threatened by any Governmental Entity with respect
to any alleged failure by Weeks or any Weeks Subsidiary to have any license,
permit, authorization, approval or consent from Governmental Entities required
under any applicable Environmental Law in connection with the conduct of the
business or operations of Weeks or any Weeks 

                                       14
<PAGE>
 
Subsidiary or with respect to any treatment, storage, recycling, transportation,
disposal or "release" as defined in 42 U.S.C. (S) 9601(22) ("Release"), by Weeks
                                                             -------
or any Weeks Subsidiary of any Hazardous Material (as defined below).

          (ii)  Neither Weeks nor any Weeks Subsidiary nor, to the Knowledge of
Weeks and its Subsidiaries, any prior owner or lessee of any property now or
previously owned or leased by Weeks or any Weeks Subsidiary has handled any
Hazardous Material on any property now or previously owned or leased by Weeks or
any Weeks Subsidiary, except in material compliance with any applicable
Environmental Law, and without limiting the foregoing, (A) no regulated level of
polychlorinated biphenyl is or has been present, (B) no friable asbestos is or
has been present, (C) there are no Hazardous Material underground storage tanks,
active or abandoned and (D) no Hazardous Material has been Released in a
quantity reportable under, or in violation of, any applicable Environmental Law,
at, on or under any property now or previously owned or leased by Weeks or any
Weeks Subsidiary, during any period that Weeks or any Weeks Subsidiary owned or
leased such property or, to the Knowledge of Weeks and its Subsidiaries, prior
thereto.

          (iii) Neither Weeks nor any Weeks Subsidiary has transported or
arranged for the transportation of any Hazardous Material to any location which
is the subject of any action, suit, arbitration or proceeding that could be
reasonably expected to lead to claims against Weeks or any Weeks Subsidiary
related to such Hazardous Material for clean-up costs, remedial work, damages to
natural resources or personal injury claims, including, but not limited to,
claims under the Comprehensive Environmental Response, Compensation and
Liability Act of 1980, as amended, and the rules and regulations promulgated
thereunder "CERCLA").
            ------   

          (iv)  No oral or written notification of a Release of a Hazardous
Material has been filed or should have been filed by or on behalf of Weeks or
any Weeks Subsidiary under an applicable Environmental Law, except for failures
to make filings which would not, individually or in the aggregate, have a Weeks
Material Adverse Effect, and no property now or previously owned or leased by
Weeks or any Weeks Subsidiary is listed or, to the Knowledge of Weeks and its
Subsidiaries, proposed for listing on the National Priorities List promulgated
pursuant to CERCLA or on any similar state list of sites requiring investigation
or clean-up.

          (v)   There are no Liens arising under or pursuant to any applicable
Environmental Law on any real property owned or leased by Weeks or any Weeks
Subsidiary, and no action of any Governmental Entity has been taken or, to the
knowledge of Falcon and the Falcon Subsidiaries, is in process which could
subject any of such properties to such Liens, and neither Weeks nor any Weeks
Subsidiary currently has a duty under any applicable Environmental Law to place
any notice or restriction relating to the presence of Hazardous Material at any
such property owned by it in any deed to such property.

          (vi)  There have been no environmental investigations, studies,
audits, tests, reviews or other analyses conducted by or which are in the
possession or control of Weeks or any Weeks Subsidiary in relation to any
property or facility now or previously owned, leased or managed by Weeks or any
Weeks Subsidiary which have not been listed in Section 3.1(o)(vi) of the Weeks
Disclosure Letter and made available to Duke prior to the execution of this
Agreement.

          (vii) As used herein:

                (A) "Environmental Law" means any Law of any Governmental Entity
                     -----------------                                          
relating to human health, safety or protection of the environment or to
emissions, discharges, releases or threatened releases of pollutants,
contaminants or Hazardous Materials in the environment (including, without

                                       15
<PAGE>
 
limitation, ambient air, surface water, ground water, land surface or subsurface
strata), or otherwise relating to the treatment, storage, disposal, transport or
handling of any Hazardous Material; and

                (B) "Hazardous Material" means (A) any petroleum or petroleum 
                     ------------------      
products, radioactive materials, asbestos in any form that is or could
reasonably be expected to become friable, urea formaldehyde foam insulation and
transformers or other equipment that contain dielectric fluid containing
regulated levels of polychlorinated biphenyls (PCBs); (B) any chemicals,
materials, substances or wastes which are now defined as or included in the
definition of "hazardous substances," "hazardous wastes," "hazardous materials,"
"extremely hazardous wastes," "restricted hazardous wastes," "toxic substances,"
"toxic pollutants" or words of similar import, under any applicable
Environmental Law; and (C) any other chemical, material, substance or waste,
exposure to which is now or hereafter prohibited, limited or regulated by any
applicable Environmental Law.

     (p) Weeks Properties.  (i) Weeks or a Weeks Subsidiary owns fee simple
         ----------------                                                  
title to or has a valid leasehold interest in, each of the real properties
reflected on the most recent balance sheet of Weeks included in the Weeks SEC
Documents or as identified in Section 3.1(p) of the Weeks Disclosure Letter (the
"Weeks Properties"), which are all of the real estate properties owned by them,
 ----------------                                                              
free and clear of liens, mortgages or deeds of trust, claims against title,
charges which are liens, security interests or other encumbrances on title
"Weeks Encumbrances") except for (a) debt identified on Schedule 3.1(m)(ii) of
- -------------------                                                           
the Weeks Disclosure Letter, (b) inchoate liens imposed for construction work in
progress or otherwise incurred in the ordinary course of business, (c)
mechanics', workmen's and repairmen's liens (other than inchoate liens for work
in progress) which have heretofore been bonded or which individually or in the
aggregate are not substantial in amount, and (d) other Weeks Encumbrances, if
any, which do not materially detract from the value of or materially interfere
with the present use of any of the Weeks Properties subject thereto or affected
thereby and do not otherwise materially impair business operations conducted by
Weeks and the Weeks Subsidiaries; (ii) the Weeks Properties are not subject to
any rights of way, written agreements, laws, ordinances and regulations
affecting building use or occupancy, or reservations of an interest in title
(collectively, "Weeks Property Restrictions"), except for (a) Weeks Property
                ---------------------------                                 
Restrictions imposed or promulgated by law or any Governmental Entity with
respect to real property, including zoning regulations, provided they do not
materially adversely affect the current use of the Weeks Properties, and (b)
other Weeks Property Restrictions and other limitations of any kind, if any,
which individually or in the aggregate are not material in amount, do not
materially detract from the value of or materially interfere with the present
use of any of the Weeks Properties subject thereto or affected thereby, do not
otherwise materially interfere with the present use of any of the Weeks
Properties subject thereto, and do not otherwise materially impair business
operations conducted by Weeks and the Weeks Subsidiaries; (iv) valid policies of
title insurance have been issued insuring Weeks' or a Weeks Subsidiary's or a
predecessor in interest's fee simple title or leasehold estate to the Weeks
Properties except as noted therein, and such policies are, at the date hereof,
in full force and effect and no claim has been made against any such policy; (v)
there is no certificate, permit or license from any Governmental Entity having
jurisdiction over any of the Weeks Properties or any agreement, easement or any
other right which is necessary to permit the lawful use and operation of the
buildings and improvements on any of the Weeks Properties or which is necessary
to permit the lawful use and operation of all driveways, roads and other means
of egress and ingress to and from any of the Weeks Properties that has not been
obtained and is not in full force and effect, or of any pending threat of
modification or cancellation of any of same, the failure of which to obtain
would not result in a Weeks Material Adverse Effect; (vi) neither Weeks nor a
Weeks Subsidiary has received written notice of any violation of any federal,
state or municipal law, ordinance, order, regulation or requirement affecting
any portion of any of the Weeks Properties issued by any Governmental Entity
that has not otherwise been resolved; (vii) neither Weeks nor a Weeks Subsidiary
has received notice to the effect that and there are no (a) condemnation or
rezoning or proceedings that are pending or, to the Knowledge of Weeks and its
Subsidiaries, threatened with respect to any of the Weeks Properties or (b)
zoning, building or similar laws, codes, ordinances, orders  or 

                                       16
<PAGE>
 
regulations that are or will be violated by the continued maintenance, operation
or use of any buildings or other improvements on any of the Weeks Properties or
by the continued maintenance, operation or use of the parking areas.

     (q)  Books and Records.
          ----------------- 

          (i)   Weeks has previously delivered or made available to Duke true
and correct copies of the articles of incorporation and by-laws of Weeks, as
amended to date, and the charter, by-laws, organization documents, partnership
agreements and joint venture agreements of its Subsidiaries, and all amendments
thereto. All such documents are listed in Section 3.1(q)(i) of the Weeks
Disclosure Letter. Weeks has also delivered to Duke evidence of its Director and
Officer liability insurance policy.

          (ii)  The minute books and other records of corporate or partnership
proceedings of Weeks and each Weeks Subsidiary have been made available to Duke,
contain in all material respects accurate records of all meetings and accurately
reflect in all material respects all other corporate action of the stockholders
and directors and any committees of the Board of Directors of Weeks and the
Weeks Subsidiaries which are corporations.

     (r)  Opinion of Financial Advisor.  The Board of Directors of Weeks has
          ----------------------------                                      
received the verbal opinion, to be confirmed in writing, of Goldman, Sachs &
Co., satisfactory to Weeks and its Board of Directors, to the effect that, as of
the date of such opinion, the Exchange Ratio is fair from a financial point of
view to the common shareholders of Weeks.  Weeks shall deliver a copy of the
written opinion of Goldman, Sachs & Co. to Duke promptly after Weeks receives
such opinion.  It is agreed and understood that such opinion is for the sole
benefit of Weeks' board of directors and may not be relied upon by Duke.

     (s)  State Takeover Statutes; Rights Agreement.
          ----------------------------------------- 

          (i)   Weeks and Weeks OP each has taken all actions necessary, if any,
to exempt the REIT Merger, the OP Merger, this Agreement, the OP Merger
Agreement, any of the transactions contemplated by this Agreement or the OP
Merger Agreement from the operation of any Takeover Statute (as defined below)
of the State of Georgia, including, without limitation, the fair price
provisions of Section 14-2-110 et seq. of the GBCC and the business combination
                               -- ----     
provisions of Section 14-2-1131 et seq. of the GBCC.
                                -- ----             

          (ii)  Weeks has taken all actions necessary to exclude Duke and any
Duke Subsidiary from the definition of "Acquiring Person under the Rights
Agreement, dated as of May 20, 1998, between Weeks and Wachovia Bank, N.A. (the
"Rights Agreement).
 ----------------

     (t)  Investment Company Act of 1940.  None of Weeks or any of the Weeks
          ------------------------------                                    
Subsidiaries is, or at the Effective Time will be, required to be registered
under the Investment Company Act of 1940, as amended (the "1940 Act").
                                                           --------   

     (u)  Proxy Statement and Registration Statement.  The information furnished
          ------------------------------------------                            
by Weeks for inclusion or incorporation by reference in the Registration
Statement and any amendment or supplement thereto will not, as of the date the
Registration Statement is declared effective by the SEC contain any untrue
statement of a material fact or omit to state any material fact required to be
stated therein or necessary in order to make the statements therein not
misleading.  The information furnished by Weeks for inclusion or incorporation
by reference in the Proxy Statement will not, on the date the Proxy Statement is
first mailed or furnished to securityholders of Weeks or Duke or on the
respective meeting dates, contain an untrue statement of a material fact or omit
to state a material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances in which they were 

                                       17
<PAGE>
 
made, not misleading. Notwithstanding the foregoing, Weeks makes no
representation or warranty with respect to any information furnished by Duke for
inclusion or incorporation by reference in any of the foregoing documents.

     (v)  Vote Required.  The affirmative vote of at least a majority of the
          -------------                                                     
outstanding shares of Weeks Common Stock is the only vote of the holders of any
class or series of Weeks' capital stock necessary (under applicable law or
otherwise) to approve the REIT Merger, this Agreement, the OP Merger, the OP
Merger Agreement and the other transactions contemplated hereby and thereby (the
"Weeks Shareholder Approvals").  The affirmative vote (by written consent or
 ---------------------------                                                
otherwise) of holders of at least a majority of the outstanding Weeks common OP
Units (other than OP Units held by Weeks or any Weeks Subsidiary) is the only
vote of the holders of any interest in Weeks OP necessary (under applicable law
or otherwise) to approve the REIT Merger, this Agreement, the OP Merger, the OP
Merger Agreement and the other transactions contemplated hereby and thereby (the
"Weeks OP Approvals").  The Weeks OP Approvals have been duly obtained.
 ------------------                                                    

     (w)  Year 2000 Issues.
          ---------------- 

          (i)   To the best knowledge of Weeks, based on representations and
warranties made by third parties, the software, hardware and equipment of Weeks
owned, leased or licensed by it and used in the conduct of its business (the
"Weeks Information Technology"), as well as the elevator systems in Weeks' 
 ----------------------------        
Office Properties, and the heating ventilation and air conditioning, fire and
safety and other automated building systems at the Weeks Properties (the "Weeks
                                                                          -----
Building Systems") are Year 2000 Ready.
- ----------------                       

          (ii)  Weeks has (A) developed and delivered to Duke a comprehensive
plan (the "Weeks Y2K Plan") for insuring that the software, hardware, equipment
           --------------  
and systems of Weeks and the Weeks Subsidiaries used in the conduct of its
business as conducted on the date hereof will be Year 2000 Ready and (B) met the
Weeks Y2K Plan milestones such that all software, hardware, equipment and
systems of Weeks and Weeks Subsidiaries will be Year 2000 Ready, except to the
extent that its failure would not have a Weeks Material Adverse Effect.

          (iii) "Year 2000 Ready" means that the software, hardware, equipment
                 ---------------                                              
and systems of Weeks and the Weeks Subsidiaries with respect to the operation of
their respective businesses and their general business plans will: (A) handle
date information involving any and all dates before, during and/or after January
1, 2000, including accepting input, providing output and performing date
calculations in whole or in part; (B) operate, accurately and without
interruption on and in respect of any and all dates before, during and/or after
January 1, 2000 and without any change in performance; and(C) store and provide
date input information without creating any ambiguity as to the century.

     Section 3.2.  Representations and Warranties of Duke.  Except as set forth
                   --------------------------------------                      
in the letter of even date herewith (with section references organized in
accordance with Section 9.9) signed by the President or Chief Executive Officer
and the Chief Financial Officer of Duke and delivered to Weeks prior to the
execution hereof (the "Duke Disclosure Letter"), Duke represents and warrants to
                       ----------------------                                   
Weeks as follows:

     (a) Organization, Standing and Corporate Power of Duke.  Duke is a
         --------------------------------------------------            
corporation duly organized and validly existing under the laws of Indiana and
has the requisite corporate power and authority to carry on its business as now
being conducted.  Duke is duly qualified or licensed to do business and is in
good standing in each jurisdiction in which the nature of its business or the
ownership, leasing of its properties or management of properties for others
makes such qualification or licensing necessary, other than in such
jurisdictions where the failure to be so qualified or licensed, individually or
in the aggregate, would not have a material adverse effect on the business,
properties, financial condition 

                                       18
<PAGE>
 
or results of operations of Duke and the Duke Subsidiaries, taken as a whole (a
"Duke Material Adverse Effect").
 ----------------------------   

     (b)  Duke Subsidiaries; Interests in Other Persons.
          --------------------------------------------- 

          (i)   Section 3.2(b) of the Duke Disclosure Letter sets forth each
Duke Subsidiary and the ownership interest therein of Duke and each other Duke
Subsidiary. All the outstanding shares of capital stock of each Duke Subsidiary
that is a corporation have been validly issued and are fully paid and
nonassessable and are not subject to any preemptive rights, and are owned by
Duke, by another Duke Subsidiary or by Duke and another Duke Subsidiary, free
and clear of all Liens, and all equity interests in each Duke Subsidiary,
including Duke OP, that is a partnership (other than Duke OP) or limited
liability company or trust are owned by Duke or by Duke and another Duke
Subsidiary free and clear of all Liens. Each Duke Subsidiary that is a
corporation is duly incorporated and validly existing under the laws of its
jurisdiction of incorporation and has the requisite corporate power and
authority to carry on its business as now being conducted and each Duke
Subsidiary, including Duke OP, that is a partnership, limited liability company
or trust is duly organized and validly existing under the laws of its
jurisdiction of organization and has the requisite power and authority to carry
on its business as now being conducted. Each Duke Subsidiary, including Duke OP,
is duly qualified or licensed to do business and is in good standing in each
jurisdiction in which the nature of its business or the ownership or leasing of
its properties makes such qualification or licensing necessary, other than in
such jurisdictions where the failure to be so qualified or licensed individually
or in the aggregate, would not have an Duke Material Adverse Effect.

          (ii)  Except for the capital stock of or other equity interests in the
Duke Subsidiaries and the other interests disclosed in Section 3.2(b)(ii) of the
Duke Disclosure Letter (the "Duke Other Interests"), Duke does not own, directly
                             --------------------
or indirectly (including through any Duke Subsidiary), any capital stock or
other ownership interest, with a fair market value as of the date of this
Agreement greater than $250,000 in any Person or which represents 5% or more of
the voting power, outstanding capital stock or other ownership interest of any
class in any Person. Neither Duke nor any Duke Subsidiary is in material default
of any provision of any organizational documents governing or otherwise relating
to its rights in any Duke Other Interest. All such organizational documents are
set forth in Section 3.2(b)(ii) of the Duke Disclosure Letter and are in full
force and effect.

     (c)  Capital Structure.  The authorized capital stock of Duke consists of
          -----------------                                                   
150,000,000 shares of Duke Common Stock and 5,000,000 shares of preferred stock,
par value $.01 per share (the "Duke Preferred Stock").  On the date hereof, (i)
                               --------------------                            
86,352,441 shares of Duke Common Stock, 300,000 shares of Duke Series A
Preferred Stock, 300,000 shares of Duke Series B Preferred Stock, no shares of
Duke Series C Preferred Stock, 540,000 shares of Duke Series D Preferred Stock,
400,000 shares of Duke Series E Preferred Stock and 15,400,000 depositary
shares, each representing a 1/10 interest in a share of Duke Preferred Stock,
were issued and outstanding, (ii) an aggregate of 2,647,863 shares were
available for grant under Duke's 1993 Stock Option Plan, Duke's 1995 Key
Employees' Stock Option Plan, the 1996 Directors' Stock Payment Plan of Duke,
the Duke 401(k) Plan, the Duke Employee Stock Purchase Plan, the 1999 Directors'
Stock Option and Dividend Increase Unit Plan of Duke and the 1999 Salary
Replacement Stock Option and Dividend Increase Unit Plan of Duke, (iii) a total
of 199,642 units of limited partnership interest were available for grant under
the 1995 Dividend Increase Unit Plan of Duke Realty Services Limited
Partnership, the 1995 Shareholder Value Plan of Duke Realty Services Limited
Partnership and the Executives Deferred Compensation Plan of Duke Realty
Services Limited Partnership (the plans named in clauses (i) and (ii) being the
"Duke Stock Plans"), 2,857,742 shares of Duke Common Stock and 34,356 units of
 ----------------                                                             
limited partnership interest in Duke Realty Services Limited Partnership were
reserved for issuance upon exercise of outstanding options to purchase shares of
Duke Common Stock and units of limited partnership interest in Duke Realty
Services Limited Partnership granted to 

                                       19
<PAGE>
 
employees of Duke and Duke Subsidiaries and directors of Duke under the Duke
Stock Plans (the "Duke Stock Options"), and (iv) 10,831,552 shares of Duke 
                  ------------------       
Common Stock were reserved for issuance upon exchange of units of limited
partnership interests in Duke OP "Duke OP Units") for shares of Duke Common 
                                  -------------  
Stock pursuant to the Duke OP Agreement and the other agreements listed in
Section 3.2(c) of the Duke Disclosure Letter (the "Duke Exchange Agreements").
                                                   ------------------------
On the date of this Agreement, except as set forth in this Section 3.2(c), no
shares of capital stock or other voting securities of Duke were issued, reserved
for issuance or outstanding. There are no outstanding stock appreciation rights
relating to the capital stock of Duke. All outstanding shares of capital stock
of Duke are, and all shares which may be issued pursuant to this Agreement will
be, when issued, duly authorized, validly issued, fully paid and nonassessable
and not subject to preemptive rights. There are no bonds, debentures, notes or
other indebtedness of Duke having the right to vote (or convertible into, or
exchangeable for, securities having the right to vote) on any matters on which
shareholders of Duke may vote. Duke is the sole general partner of Duke OP and
also holds an 88.9% limited partner interest in Duke OP. As of the date hereof,
97,183,993 common Duke OP Units, 300,000 Series A Preferred Duke OP Units,
300,000 Series B Duke OP Units, no Series C Preferred Duke OP Units and 540,000
Series D Preferred Duke OP Units are validly issued and outstanding, fully paid
and nonassessable and not subject to preemptive rights. The common Duke OP Units
not held by Duke are exchangeable for Duke Common Stock on a one-for-one basis
into an aggregate of 10,831,552 shares of Duke Common Stock in accordance with
the terms of the Duke OP Agreement and the Duke Exchange Agreements, subject to
adjustment as provided in the Duke OP Agreement and the Duke Exchange
Agreements. Section 3.2(c) of the Duke Disclosure Letter sets forth the name,
number and class of OP Units and the percentage interest of each partner in Duke
OP. Except as set forth in this Section 3.2(c), and except (A) for the Duke
Stock Options and Duke OP Units (which, subject to certain restrictions, may be
delivered to Duke in exchange for Duke Common Stock), and (B) as contemplated
under Duke's dividend reinvestment plan and employee stock purchase plan, as of
the date of this Agreement there are no outstanding securities, options,
warrants, calls, rights, commitments, agreements, arrangements or undertakings
of any kind to which Duke or any Duke Subsidiary, including Duke OP, is a party
or by which such entity is bound, obligating Duke or any Duke Subsidiary,
including Duke OP, to issue, deliver or sell, or cause to be issued, delivered
or sold, additional shares of capital stock, voting securities or other
ownership interests of Duke or of any Duke Subsidiary, including Duke OP, or
obligating Duke or any Duke Subsidiary, including Duke OP, to issue, grant,
extend or enter into any such security, option, warrant, call, right,
commitment, agreement, arrangement or undertaking (other than to Duke or a Duke
Subsidiary). Except as set forth in this Section 3.2(c), there are no
outstanding contractual obligations of Duke or any Duke Subsidiary, including
Duke OP, to repurchase, redeem or otherwise acquire any shares of capital stock
or other ownership interests in Duke or any Duke Subsidiary, including Duke OP,
or make any material investment (in the form of a loan, capital contribution or
otherwise) in any Person other than Duke OP.

     (d) Authority; Noncontravention; Consents.  Duke has the requisite
         -------------------------------------                         
corporate power and authority to enter into this Agreement and, subject to
receipt of the Duke Shareholder Approvals (as defined in Section 3.2(u)), to
consummate the transactions contemplated by this Agreement.  Duke, on behalf of
Duke OP, as its sole general partner, has the requisite power and authority to
enter into the OP Merger Agreement and to consummate the transactions
contemplated by the OP Merger Agreement.  The execution and delivery of this
Agreement and other agreements contemplated by this Agreement by Duke and the
consummation by Duke of the transactions contemplated hereby to which Duke is a
party have been duly authorized by all necessary action on the part of Duke,
subject to receipt of the Duke Shareholder Approvals.  The execution and
delivery of the OP Merger Agreement and any other agreement contemplated by this
Agreement or the OP Merger Agreement by Duke, as the sole general partner of
Duke OP, and by Duke OP and the consummation by Duke OP of the transactions
contemplated hereby and by the OP Merger Agreement have been duly authorized by
all necessary partnership action.  This Agreement, the OP Merger Agreement and
the other agreements contemplated by this Agreement have been duly executed and
delivered by Duke or Duke OP, as the case may be, and 

                                       20
<PAGE>
 
constitute the valid and binding obligations of Duke and Duke OP, as the case
may be, enforceable against Duke or Duke OP in accordance with their terms. The
execution and delivery of this Agreement, the OP Merger Agreement and the other
agreements contemplated by this Agreement and the OP Merger Agreement by Duke on
behalf of itself and as general partner of Duke OP do not, and the consummation
of the transactions contemplated hereby and thereby to which either Duke or Duke
OP is a party and compliance by either Duke or Duke OP with the provisions of
this Agreement, the OP Merger Agreement and the other agreements contemplated by
this Agreement and the OP Merger Agreement will not, conflict with, or result in
any violation of, or default (with or without notice or lapse of time, or both)
under, or give rise to a right of termination, cancellation or acceleration of
any obligation or to loss of a material benefit under, or result in the creation
of any Lien upon any of the properties or assets of Duke or any Duke Subsidiary
under, (i) the Charter or By-laws or the comparable charter or organizational
documents or partnership or similar agreement (as the case may be) of any Duke
Subsidiary, each as amended or supplemented to the date of this Agreement, (ii)
any loan or credit agreement, note, bond, mortgage, indenture, reciprocal
easement agreement, lease or other agreement, instrument, permit, concession,
contract, franchise or license applicable to Duke or any Duke Subsidiary or
their respective properties or assets or (iii) subject to the governmental
filings and other matters referred to in the following sentence, any Laws
applicable to Duke or any Duke Subsidiary or their respective properties or
assets, other than, in the case of clause (ii) or (iii), any such conflicts,
violations, defaults, rights or Liens that individually or in the aggregate
would not (x) have a Duke Material Adverse Effect or (y) materially delay or
prevent the consummation of the REIT Merger or the OP Merger or the transactions
contemplated by this Agreement or the OP Merger Agreement. No consent, approval,
order or authorization of, or registration, declaration or filing with, any
Governmental Entity is required by or with respect to Duke or any Duke
Subsidiary (including Duke OP) in connection with the execution and delivery of
this Agreement, the OP Merger Agreement or the other agreements contemplated by
this Agreement, by Duke or Duke OP, as the case may be, or the consummation by
Duke and its Subsidiaries of any of the transactions contemplated hereby, except
for (i) the filing with the SEC of (x) the Proxy Statements and the Registration
Statements and (y) such reports under Section 13 of the Exchange Act as may be
required in connection with this Agreement and the transactions contemplated by
this Agreement, (ii) the filing of the Articles of Merger for the REIT Merger
with the Secretary of State of Indiana and the Secretary of State of Georgia,
(iii) the filing of a certificate of merger for the OP Merger with the Secretary
of State of Indiana and the Secretary of State of Georgia, (iv) such filings as
may be required in connection with the payment of any Transfer and Gains Taxes,
(v) the termination or expiration of all waiting periods under the HSR Act and
(vi) such other consents, approvals, orders, authorizations, registrations,
declarations and filings as are set forth in Section 3.2(d) of the Duke
Disclosure Letter or (A) as may be required under (x) federal, state or local
environmental laws or (y) the "blue sky" laws of various states or (B) which, if
not obtained or made, would not prevent or delay in any material respect the
consummation of the REIT Merger or the OP Merger or any of the transactions
contemplated by this Agreement or the OP Merger Agreement or otherwise prevent
Duke or Duke OP from performing its obligations under this Agreement in any
material respect or have, individually or in the aggregate, a Duke Material
Adverse Effect.

     (e)  SEC Documents; Financial Statements; Undisclosed Liabilities.  Duke 
          ------------------------------------------------------------     
and Duke OP have filed all required reports, schedules, forms, statements and
other documents with the SEC since January 1, 1995 and August 4, 1997,
respectively (collectively, the "Duke SEC Documents"). All of the Duke SEC
                                 ------------------ 
Documents (other than preliminary materials or materials that were subsequently
amended), as of their respective filing dates, complied in all material respects
with all applicable requirements of the Securities Act and the Exchange Act and,
in each case, the rules and regulations promulgated thereunder applicable to
such Duke SEC Documents. None of the Duke SEC Documents at the time of filing
contained any untrue statement of a material fact or omitted to state any
material fact required to be stated therein or necessary in order to make the
statements therein, in light of the circumstances under which they were made,
not misleading, except to the extent such statements have been amended, modified
or superseded 

                                       21
<PAGE>
 
by later filed Duke SEC Documents. None of the Duke SEC Documents is the subject
of any confidential treatment request by Duke or Duke OP. Section 3.2(e) lists
all of the Duke SEC Documents filed with the SEC since January 1, 1998. The
consolidated financial statements of Duke and Duke OP, as applicable, included
in the Duke SEC Documents complied as to form in all material respects with
applicable accounting requirements and the published rules and regulations of
the SEC with respect thereto, have been prepared in accordance with GAAP
(except, in the case of interim financial statements, as permitted by the
applicable rules and regulations of the SEC) applied on a consistent basis
during the periods involved (except as may be indicated in the notes thereto)
and fairly presented in all material respects, in accordance with the applicable
requirements of GAAP, the consolidated financial position of Duke and the Duke
Subsidiaries, taken as a whole, as of the dates thereof and the consolidated
results of operations and cash flows for the periods then ended (subject, in the
case of interim financial statements, to normal year-end adjustments). Except as
set forth in the Duke SEC Documents filed with the SEC prior to the date of this
Agreement, neither Duke nor any Duke Subsidiary has any liabilities or
obligations of any nature (whether accrued, absolute, contingent or otherwise)
required by GAAP to be set forth on a consolidated balance sheet of Duke or in
the notes thereto and which, individually or in the aggregate, would have a Duke
Material Adverse Effect.

     (f) Absence of Certain Changes or Events.  Except as disclosed in the Duke
         ------------------------------------                                  
SEC Documents filed with the SEC prior to the date of this Agreement since
December 31, 1997 (the "Duke Financial Statement Date") and to the date of this
                        -----------------------------                          
Agreement, Duke and the Duke Subsidiaries have conducted their business only in
the ordinary course and there has not been (i) any change that would have a Duke
Material Adverse Effect (a "Duke Material Adverse Change"), nor has there been
                            ----------------------------                      
any occurrence or circumstance that with the passage of time would reasonably be
expected to result in an Duke Material Adverse Change, (ii) any declaration,
setting aside or payment of any dividend or distribution (whether in cash, stock
or property) with respect to any of Duke's capital stock or any Duke OP Units,
except for (A) regular quarterly dividends (in the case of Duke) of $.34 per
share of Duke Common Stock, and the dividend, if any, to be paid by Duke
pursuant to Section 2.2(c)(i) (and the corresponding Duke OP distribution), (B)
regular quarterly distributions (in the case of Duke OP) of $.34 per Duke Common
OP Unit, $.56875 per Duke Series A Preferred OP Unit, $.99875 per Duke Series B
Preferred OP Unit, $.46 per Duke Series D Preferred Unit and $.515625 per Duke
Series E Preferred Unit, (C) regularly quarterly dividends (in the case of Duke)
of $.56875 on outstanding shares of Duke Series A Preferred Stock, $.99875 on
Duke Series B Preferred Stock, $.46 on Duke Series D Preferred Stock and
$.515625 on Duke Series E Preferred Stock and (D) any distributions by any Duke
Subsidiaries (other than Duke OP) to other Duke Subsidiaries or to Duke, in each
case with customary record and payment dates, (iii) any split, combination or
reclassification of any of Duke's capital stock or any issuance or the
authorization of any issuance of any other securities in respect of, in lieu of
or in substitution for, or giving the right to acquire by exchange or exercise,
shares of its capital stock or any issuance of an ownership interest in any Duke
Subsidiary, (iv) any damage, destruction or loss, whether or not covered by
insurance, that has or would have a Duke Material Adverse Effect, or (v) any
change in accounting methods, principles or practices by Duke or any Duke
Subsidiary materially affecting its assets, liabilities or business, except
insofar as may have been disclosed in the Duke SEC Documents filed with the SEC
prior to the date of this Agreement, or required by a change in GAAP.

     (g)  Litigation.  Except as disclosed in the Duke SEC Documents filed with
          ----------                                                           
the SEC prior to the date of this Agreement and other than personal injury and
other routine tort litigation arising from the ordinary course of operations of
Duke or the Duke Subsidiaries which are covered by adequate insurance, there is
no suit, action or proceeding pending or, to the knowledge of Duke and Duke OP,
threatened against or affecting Duke or any Duke Subsidiary that, individually
or in the aggregate, could reasonably be expected to (i) have a Duke Material
Adverse Effect or (ii) prevent the consummation of any of the transactions
contemplated hereby, nor is there any judgment, decree, injunction, rule or
order of any 

                                       22
<PAGE>
 
Governmental Entity or arbitrator outstanding against Duke or any Duke
Subsidiary having, or which, insofar as reasonably can be foreseen, in the
future would have, any such effect.

     (h)  Absence of Changes in Benefit Plans; ERISA Compliance.
          ----------------------------------------------------- 

          (i)   Except as disclosed in the Duke SEC Documents filed with the SEC
prior to the date of this Agreement, since the Duke Financial Statement Date,
there has not been any adoption or amendment in any material respect, or the
undertaking of any additional obligation, by Duke, any Duke Subsidiary or any
Duke ERISA Affiliate (as defined below) of any Duke Benefit Plan (as defined
below). For purposes of this Agreement, "Duke Benefit Plan" shall mean any
                                         -----------------                
Employee Plan sponsored or maintained by Duke, any Duke Subsidiary or any Duke
ERISA Affiliate, or with respect to which Duke, any Duke Subsidiary or any Duke
ERISA Affiliate has any obligation to contribute, has liability under or is
otherwise a party to, or which otherwise provides benefits for any current or
former employees, officers, directors or other independent contractors (or their
dependents and beneficiaries) of Duke or any Duke Subsidiary.  For purposes of
this Agreement, "Duke ERISA Affiliate" means any entity required to be
                 --------------------                                 
aggregated with any of Duke or any Duke Subsidiary under Sections 414(b), (c),
(m) or (o) of the Code or Section 4001 of ERISA.  Schedule 3.2(h)(i) to the Duke
Disclosure Letter sets forth each Duke Benefit Plan.

          (ii)  Except as described in the Duke SEC Documents filed with the SEC
prior to the date of this Agreement or as would not have a Duke Material Adverse
Effect, (A) all Duke Benefit Plans, including any such plan that is an "employee
benefit plan" as defined in Section 3(3) of ERISA, are in compliance with the
terms of such plan and all applicable requirements of law, including ERISA and
the Code and, without limitation, the requirements of ERISA and all tax rules
for which favorable tax treatment is intended, and (B) there are no liabilities
or obligations with respect to any such Duke Benefit Plan, whether accrued,
contingent or otherwise (other than obligations by Duke and the Duke
Subsidiaries to make contributions, and for such plan to pay benefits and
administrative costs, incurred in the ordinary course), nor to the knowledge of
Duke are any such liabilities or obligations expected to be incurred. The
execution of, and performance of the transactions contemplated in, this
Agreement will not (either alone or together with the occurrence of any
additional or subsequent events) constitute an event under any Duke Benefit
Plan, policy, program, arrangement or agreement, trust or loan that will or may
result in any payment (whether of severance pay or otherwise), acceleration,
forgiveness of indebtedness, vesting, distribution, increase in benefits or
obligation to fund benefits with respect to any employee or director, will not
result in any "golden parachute payments" being due (as defined for purposes of
Section 280G of the Code), or result in any breach or violation of, or a default
under, any of the Duke Benefit Plans. The only severance agreements or severance
policies applicable to Duke or the Duke Subsidiaries are the agreements and
policies specifically referred to in Section 3.2(h)(ii) of the Duke Disclosure
Letter.

          (iii) Without limiting the foregoing, each Duke Benefit Plan which is
intended to be tax-qualified under Section 401(a) of the Code has been
determined by the IRS to be so qualified and such determination has not been
modified, revoked or limited, and no circumstances have occurred that would
adversely affect the tax-qualified status of any such plan.  No Duke Benefit
Plan is or has ever been subject to Part III of Subtitle B of Title I of ERISA
or  Title IV of ERISA or Section 412 of the Code.  None of Duke or any Duke
Subsidiary, or any "party in interest" (as defined in Section 3(14) of ERISA) or
any "disqualified person" (as defined in Section 4975 of the Code) with respect
to any Duke Benefit Plan, has engaged in a non-exempt "prohibited transaction"
within the meaning of Section 4975 of the Code or Section 406 of ERISA that
would have a Duke Material Adverse Effect.

                                       23
<PAGE>
 
     (i)  Taxes.
          ----- 

          (i)   Each of Duke and each Duke Subsidiary (including Duke OP) has
timely filed with the appropriate taxing authority all Tax Returns and reports
required to be filed by it (after giving effect to any filing extension properly
granted by a Governmental Entity having authority to do so). Each such Tax
Return is true, correct and complete in all material respects. Duke and each
Duke Subsidiary (including Duke OP) have paid (or Duke has paid on their
behalf), within the time and manner prescribed by law, all Taxes that are due
and payable. The Tax Returns of Duke and each Duke Subsidiary have not been
audited by any Taxing Authority. There are no Tax liens upon the assets of Duke
or any Duke Subsidiary other than liens for Taxes not yet due. The most recent
financial statements contained in the Duke SEC Documents filed with the SEC
prior to the date of this Agreement reflect an adequate reserve for all material
Taxes payable by Duke and by each Duke Subsidiary for all taxable periods and
portions thereof through the date of such financial statements. Since the Duke
Financial Statement Date, Duke has incurred no liability for federal taxes,
other than withholding and employment taxes, under the Code or IRS Notice 88-19.
To the knowledge of Duke, no event has occurred, and no condition or
circumstance exists, which presents a material risk that any material Tax
described in the preceding sentence will be imposed upon Duke. To the knowledge
of Duke, no deficiencies for any Taxes have been proposed, asserted or assessed
against Duke or any of the Duke Subsidiaries, and no requests for waivers of the
time to assess any such Taxes have been granted or are pending.

          (ii)  Duke (A) for all of its taxable years beginning with its
taxable year ending on December 31, 1986 has been subject to taxation as a REIT
within the meaning of the Code and has satisfied the requirements to qualify as
a REIT for such years, (B) has operated, and intends to continue to operate, in
such a manner as to qualify as a REIT, and (C) has not taken or omitted to take
any action which could reasonably be expected to result in a challenge to its
status as a REIT, and, to Duke's knowledge, no such challenge is pending or
threatened. Duke OP has at all times, and each other Duke Subsidiary which is a
partnership or limited liability company or files Tax Returns as a partnership
for federal income tax purposes has since its acquisition by Duke, been
classified for federal income tax purposes as a partnership or disregarded
entity and not as an association taxable as a corporation or a "publicly traded
partnership" within the meaning of Section 7704(b) of the Code that is treated
as a corporation for federal income tax purposes under Section 7704(a) of the
Code. Duke OP has operated, and Duke intends to cause Duke OP to continue to
operate, in such a manner as to satisfy the gross income requirements of Section
7704(c)(2) of the Code, so that if Duke OP were classified as a publicly traded
partnership, Duke OP would not be treated for federal income tax purposes as a
corporation under Section 7704(a) of the Code.

          (iii) To the best knowledge and belief of Duke, Duke qualifies as a
"domestically-controlled" REIT within the meaning of Section 897(h)(4)(B) of the
Code, as of the date hereof.

     (j)  No Loans or Payments to Employees, Officers or Directors. Except as
          --------------------------------------------------------
disclosed in the Duke SEC Documents or as otherwise specifically provided for in
this Agreement, there is no (i) loan outstanding from or to any employee or
director, (ii) employment or consulting contracts, (iii) agreements requiring
payments to be made on a change of control or otherwise as a result of the
consummation of any of the transactions with respect to any employee, officer or
director of Duke or any Duke Subsidiary or (iv) any agreement to appoint or
nominate any person as a director of Duke.

     (k)  Brokers; Schedule of Fees and Expenses.  No broker, investment banker,
          --------------------------------------                                
financial advisor or other person, other than Merrill Lynch & Co., the fees and
expenses of which, as set forth in a letter agreement between Duke and such
financial advisor, have previously been disclosed to Weeks and will be paid by
Duke, is entitled to any broker's, finder's, financial advisor's or other
similar fee or commission in connection with the REIT Merger, the OP Merger or
any of the transactions contemplated 

                                       24
<PAGE>
 
by this Agreement or the OP Merger Agreement based upon arrangements made by or
on behalf of Duke or any other Duke Subsidiary.

     (l)  Compliance with Laws.  Except as disclosed in the Duke SEC Documents
          --------------------                                                
filed with the SEC prior to the date of this Agreement neither Duke nor any of
the Duke Subsidiaries has violated or failed to comply with any statute, law,
ordinance, regulation, rule, judgment, decree or order of any Governmental
Entity applicable to its business, properties or operations, except for
violations and failures to comply that would not, individually or in the
aggregate, reasonably be expected to result in a Duke Material Adverse Effect.

     (m)  Contracts; Debt Instruments.
          --------------------------- 

          (i)   Neither Duke nor any Duke Subsidiary has received written
notice that it is in violation of or in default under, in any material respect
(nor does there exist any condition which upon the passage of time or the giving
of notice or both would cause such a violation of or default under), any
material loan or credit agreement, note, bond, mortgage, indenture, lease,
permit, concession, franchise or license, or any agreement to acquire real
property, or any other material contract, agreement, arrangement or
understanding, to which it is a party or by which it or any of its properties or
assets is bound, except for violations or defaults that would not, individually
or in the aggregate, result in a Duke Material Adverse Effect.

          (ii)  Section 3.2(m)(ii) of the Duke Disclosure Letter sets forth (A)
a detailed list of all loan indebtedness of Duke or any of the Duke
Subsidiaries, other than indebtedness payable to Duke or a wholly owned Duke
Subsidiary, in an aggregate principal amount in excess of $5,000,000 per item is
outstanding or may be incurred and (B) the respective principal amounts
outstanding thereunder on December 31, 1998.

          (iii) Neither Duke nor any Duke Subsidiary has entered into or is
subject, directly or indirectly, to any Duke Tax Protection Agreements.  As used
herein, a "Duke Tax Protection Agreement" is an agreement, oral or written, (A)
           -----------------------------                                       
that has as one of its purposes to permit a Person to take the position that
such Person could defer federal taxable income that otherwise might have been
recognized attributable to the acquisition or ownership of Duke OP Units or an
interest in any other Duke Subsidiary that is treated as a partnership for
federal income tax purposes, and (B) that (i) prohibits or restricts in any
manner the disposition of any assets of Duke or any Duke Subsidiary, (ii)
requires that Duke or any Duke Subsidiary maintain, increase or put in place, or
replace, indebtedness, whether or not secured by one or more of the Duke
Properties, or (iii) requires that Duke or any Duke Subsidiary offer to any
person or entity at any time the opportunity to guarantee or otherwise assume,
directly or indirectly, the risk of loss for federal income tax purposes for
indebtedness or other liabilities of Colt or any Colt Subsidiary.

     (n)  Duke OP Agreement.  The Duke OP Agreement has been duly authorized,
          -----------------                                                  
executed and delivered by Duke.  Assuming due execution by the limited partners
of Duke OP, the Duke OP Agreement constitutes a valid and binding obligation of
Duke, enforceable against Duke in accordance with its terms.

     (o)  Environmental Matters.  Except as disclosed in Section 3.2(o) of the
          ---------------------                                               
Duke Disclosure Letter, each of Duke and each Duke Subsidiary has obtained all
licenses, permits, authorizations, approvals and consents from Governmental
Entities which are required of Duke and each Duke Subsidiary in respect of its
business, operations, assets or properties under any applicable Environmental
Law, and each of Duke and each Duke Subsidiary is in compliance in all respects
with the terms and conditions of all such licenses, permits, authorizations,
approvals and consents and with its obligations under any applicable
Environmental Law, except for such failures to comply which would not,

                                       25
<PAGE>
 
individually or in the aggregate, have a Duke Material Adverse Effect.  Except
as disclosed in Section 3.2(o) of the Duke Disclosure Letter or in the
environmental audits/reports listed thereon:

          (i)   No Order has been issued that is still in effect, no complaint
has been filed that has not been resolved, no penalty has been assessed that has
not been paid and no investigation or review is pending or , to the Knowledge of
Duke and its Subsidiaries, threatened by any Governmental Entity with respect to
any alleged failure by Duke or any Duke Subsidiary to have any license, permit,
authorization, approval or consent from Governmental Entities required under any
applicable Environmental Law in connection with the conduct of the business or
operations of Duke or any Duke Subsidiary or with respect to any Release by Duke
or any Duke Subsidiary of any Hazardous Material.

          (ii)  Neither Duke nor any Duke Subsidiary nor, to the Knowledge of
Duke and its Subsidiaries, any prior owner or lessee of any property now or
previously owned or leased by Duke or any Duke Subsidiary has handled any
Hazardous Material on any property now or previously owned or leased by Duke or
any Duke Subsidiary except in material compliance with any applicable
Environmental Law, and without limiting the foregoing, (A) no regulated level of
polychlorinated biphenyl is or has been present, (B) no friable asbestos is or
has been present, (C) there are no Hazardous Material underground storage tanks,
active or abandoned and (D) no Hazardous Material has been Released in a
quantity reportable under, or in violation of, any applicable Environmental Law,
at, on or under any property now or previously owned or leased by Duke or any
Duke Subsidiary, during any period that Duke or any Duke Subsidiary owned or
leased such property or, to the Knowledge of Duke and its Subsidiaries, prior
thereto.

          (iii) Neither Duke nor any Duke Subsidiary has transported or
arranged for the transportation of any Hazardous Material to any location which
is the subject of any action, suit, arbitration or proceeding that could be
reasonably expected to lead to claims against Duke or any Duke Subsidiary
related to such Hazardous Material for clean-up costs, remedial work, damages to
natural resources or personal injury claims, including, but not limited to,
claims under CERCLA.

          (iv)  No oral or written notification of a Release of a Hazardous
Material has been filed or should have been filed by or on behalf of Duke or any
Duke Subsidiary under an applicable Environmental Law, except for failures to
make filings which would not, individually or in the aggregate, have a Material
Adverse Effect and no property now or previously owned or leased by Duke or any
Duke Subsidiary is listed or, to the Knowledge of Duke and its Subsidiaries,
proposed for listing on the National Priorities List promulgated pursuant to
CERCLA or on any similar state list of sites requiring investigation or clean-
up.

          (v)   There are no Liens arising under or pursuant to any applicable
Environmental Law on any real property owned or leased by Duke or any Duke
Subsidiary, and no action of any Governmental Entity has been taken or, to the
knowledge of Colt and the Colt Subsidiaries, is in process which could subject
any of such properties to such Liens, and neither Duke nor any Duke Subsidiary
currently has a duty under any applicable Environmental Law to place any notice
or restriction relating to the presence of Hazardous Material at any such
property owned by it in any deed to such property.

          (vi)  There have been no environmental investigations, studies,
audits, tests, reviews or other analyses conducted by or which are in the
possession or control of Duke or any Duke Subsidiary in relation to any property
or facility now or previously owned or leased by Duke or any Duke Subsidiary
which have not been listed in Section 3.2(o)(vi) of the Duke Disclosure Letter
and made available to Weeks prior to the execution of this Agreement.

                                       26
<PAGE>
 
     (p)  Duke Properties.  (i) Duke or a Duke Subsidiary owns fee simple title
          ---------------                                                      
to or has a valid leasehold interest in, each of the real properties reflected
on the most recent balance sheet of Duke included in the Duke SEC Documents or
as identified in Section 3.2(o) of the Duke Disclosure Letter (the "Duke
                                                                    ----
Properties"), which are all of the real estate properties owned by them, free
- ----------                                                                   
and clear of liens, mortgages or deeds of trust, claims against title, charges
which are liens, security interests or other encumbrances on title "Duke
                                                                    ----
Encumbrances") except for (a) debt identified on Schedule 3.2(m)(ii), (b)
- ------------                                                             
inchoate liens imposed for construction work in progress or otherwise incurred
in the ordinary course of business, (c) mechanics', workmen's and repairmen's
liens (other than inchoate liens for work in progress) which have heretofore
been bonded or which individually or in the aggregate are not substantial in
amount, and (d) other Duke Encumbrances, if any, which do not materially detract
from the value of or materially interfere with the present use of any of the
Duke Properties subject thereto or affected thereby and do not otherwise
materially impair business operations conducted by Duke and the Duke
Subsidiaries; (ii) the Duke Properties are not subject to any rights of way,
written agreements, laws, ordinances and regulations affecting building use or
occupancy, or reservations of an interest in title (collectively, "Duke Property
                                                                   -------------
Restrictions"), except for (a) Duke Property Restrictions imposed or promulgated
- ------------                                                                    
by law or any Governmental Entity with respect to real property, including
zoning regulations, provided they do not materially adversely affect the current
use of the Duke Properties, and (b) other Duke Property Restrictions and other
limitations of any kind, if any, which have heretofore been bonded or which
individually or in the aggregate are not material in amount, do not materially
detract from the value of or materially interfere with the present use of any of
the Duke Properties subject thereto, do not otherwise materially interfere with
the present use of any of the Duke Properties subject thereto, and do not
otherwise materially impair business operations conducted by Duke and the Duke
Subsidiaries; (iv) valid policies of title insurance have been issued insuring
Duke's or a Duke Subsidiary's or a predecessor in interest's fee simple title or
leasehold estate to the Duke Properties except as noted therein, and such
policies are, at the date hereof, in full force and effect and no claim has been
made against any such policy; (v) there is no certificate, permit or license
from any Governmental Entity having jurisdiction over any of the Duke Properties
or any agreement, easement or any other right which is necessary to permit the
lawful use and operation of the buildings and improvements on any of the Duke
Properties or which is necessary to permit the lawful use and operation of all
driveways, roads and other means of egress and ingress to and from any of the
Duke Properties that has not been obtained and is not in full force and effect,
or of any pending threat of modification or cancellation of any of same, the
failure of which to obtain would not result in a Duke Material Adverse Effect;
(vi) neither Duke nor a Duke Subsidiary has received written notice of any
violation of any federal, state or municipal law, ordinance, order, regulation
or requirement affecting any portion of any of the Duke Properties issued by any
Governmental Entity that has not otherwise been resolved; (vii) neither Duke nor
a Duke Subsidiary has received notice to the effect that and there are no (a)
condemnation or rezoning or proceedings that are pending or, to the Knowledge of
Duke and its Subsidiaries, threatened with respect to any of the Duke Properties
or (b) zoning, building or similar laws, codes, ordinances, orders  or
regulations that are or will be violated by the continued maintenance, operation
or use of any buildings or other improvements on any of the Duke Properties or
by the continued maintenance, operation or use of the parking areas.

     (q)  Opinion of Financial Advisor.  The Board of Directors of Duke has
          ----------------------------                                     
received the opinion of Merrill Lynch & Co., Duke's financial advisor,
satisfactory to Duke's Board of Directors, to Weeks to the effect that, as of
the date of such opinion, the Exchange Ratio is fair to the shareholders of Duke
from a financial point of view.  Duke shall promptly deliver to Weeks a copy of
the written opinion of Merrill Lynch & Co.  It is agreed and understood that
such opinion is for the sole benefit of Duke's board of directors and may not be
relied upon by Weeks.

     (r)  State Takeover Statutes.  Duke and Duke OP each have taken all actions
          -----------------------                                               
necessary, if any, to exempt the REIT Merger, the OP Merger, this Agreement, the
OP Merger Agreement, any of the transactions contemplated by this Agreement or
the OP Merger Agreement from the operation of any 

                                       27
<PAGE>
 
Takeover Statute of the State of Indiana, including, without limitation, the
control share acquisition provisions of Chapter 42 of the IBCL and the business
combination provisions of Chapter 43 of the IBCL.

     (s)  1940 Act.  None of Duke or any of the Duke Subsidiaries is, or at the
          --------                                                             
Effective Time will be, required to be registered under the 1940 Act.

     (t)  Proxy Statement and Registration Statement.  The information furnished
          ------------------------------------------                            
by Duke for inclusion or incorporation by reference in the Registration
Statement and any amendment or supplement thereto will not, as of the date the
Registration Statement is declared effective by the SEC contain any untrue
statement of a material fact or omit to state any material fact required to be
stated therein or necessary in order the make the statements therein not
misleading.  The information furnished by Duke for inclusion or incorporation by
reference in the Proxy Statement will not, on the dates the Proxy Statement
first is mailed or furnished to securityholders of Weeks or Duke or on the
respective meeting dates, contain an untrue statement of a material fact or omit
to state a material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances in which they were made, not
misleading. Notwithstanding the foregoing, Duke makes no representation or
warranty with respect to any information furnished by Weeks for inclusion or
incorporation by reference in any of the foregoing documents.

     (u)  Vote Required.  The affirmative vote of at least a majority of the
          -------------                                                     
outstanding shares of Duke Common Stock is the only vote of the holders of any
class or series of Duke's capital stock necessary (under applicable law or
otherwise) to approve the REIT Merger, this Agreement, the OP Merger, the OP
Merger Agreement and the amendments to Duke's Charter contemplated by this
Agreement other than the Duke Special Charter Proposal (the "Duke Merger
                                                             -----------
Shareholder Approval").  The Duke 80% Approval is the only vote of the holders
- --------------------                                                          
of any class or series of Duke's capital stock necessary (under applicable law
or otherwise) to approve the Duke Special Charter Proposal (the "Duke Special
                                                                 ------------
Charter Shareholder Approval" and together with the Duke Merger Shareholder
- ----------------------------                                               
Approval, the "Duke Shareholder Approvals").  The affirmative vote (by written
               --------------------------                                     
consent or otherwise) of at least 90% of the outstanding Duke common OP Units is
the only vote of the holders of any interest in Duke OP necessary (under
applicable law or otherwise) to approve the REIT Merger, the REIT Merger
Agreement, the OP Merger, the OP Merger Agreement and the transactions
contemplated hereby and thereby (the "Duke OP Approvals").  The Duke OP
                                      -----------------                
Approvals have been duly obtained.

     (v)  Year 2000 Issues.
          ---------------- 

          (i)   To the best knowledge of Duke, based on representations and
warranties made by third parties, the software, hardware and equipment of Duke
owned, leased or licensed by it and used in the conduct of its business (the
"Duke Information Technology"), as well as the elevator systems in Duke's
 ---------------------------
Office Properties, and the heating ventilation and air conditioning, fire and
safety and other automated building systems at the Duke Properties (the 
"Duke Building Systems") are Year 2000 Ready.
 ---------------------

          (ii)  Duke has (A) developed and delivered to Weeks a comprehensive
plan (the "Duke Y2K Plan") for insuring that the software, hardware, equipment
           -------------                
and systems of Duke and the Duke Subsidiaries used in the conduct of its
business as conducted on the date hereof will be Year 2000 Ready and (B) met the
Duke Y2K Plan milestones such that all software, hardware, equipment and systems
of Duke and the Duke Subsidiaries will be Year 2000 Ready, except to the extent
that its failure would not have a Duke Material Adverse Effect.

          (iii) "Year 2000 Ready" means that the software, hardware, equipment
                ---------------                                              
and systems of Duke and the Duke Subsidiaries with respect to the operation of
their respective businesses and their 

                                       28
<PAGE>
 
general business plans will: (A) handle date information involving any and all
dates before, during and/or after January 1, 2000, including accepting input,
providing output and performing date calculations in whole or in part; (B)
operate, accurately and without interruption on and in respect of any and all
dates before, during and/or after January 1, 2000 and without any change in
performance and (C) store and provide date input information without creating
any ambiguity as to the century.

                                  ARTICLE IV

                                   COVENANTS
                                   ---------

     Section 4.1.  Conduct of Business by Weeks and Weeks OP.  During the period
                   -----------------------------------------                    
from the date of this Agreement to the Effective Time, Weeks shall, and shall
cause each of the Weeks Subsidiaries (including Weeks OP) to, carry on its
businesses in the usual, regular and ordinary course in substantially the same
manner as heretofore conducted and, to the extent consistent therewith, use
commercially reasonable efforts to preserve intact its current business
organization, goodwill,  ongoing businesses and Weeks' status as a REIT within
the meaning of the Code.  Without limiting the generality of the foregoing, the
following additional restrictions shall apply:  during the period from the date
of this Agreement to the earlier of (i) the termination of this Agreement or
(ii) the Effective Time, except as set forth in Section 4.1 of the Weeks
Disclosure Letter or as otherwise contemplated by this Agreement, Weeks shall
not and shall cause the Weeks Subsidiaries (including Weeks OP) not to (and not
to authorize or commit or agree to):

     (a)  (i)   declare, set aside or pay any dividends on, or make any other
distributions in respect of, any of Weeks' capital stock or the Weeks OP Units
or partnership interests, stock or other equity interests in any Weeks
Subsidiary that is not directly or indirectly wholly owned by Weeks, except (v)
in the case of Weeks, for regular quarterly dividends not in excess of $.505 per
share of Weeks Common Stock, $.50 per share of Weeks Series A Preferred Stock
and $.5390625 per share of Weeks Series D Preferred Stock, (w) in the case of
Weeks OP, for regular quarterly distributions to Weeks GP and limited partners
of Weeks OP not in excess of $.505 per common Weeks OP Unit, $.50 per Weeks
Series A preferred OP Unit, $.50 per Weeks Series C Preferred OP Unit and
$.5390625 per Weeks Series D Preferred OP Unit, (x) any other distributions by
any other wholly owned Weeks Subsidiaries, in each case with customary record
and payment dates, (y) the Final Weeks Dividend to be paid pursuant to Section
2.2(d)(i) (and the corresponding Weeks OP distribution) and (z) other dividends
necessary in order for Weeks to maintain its status as a REIT (which shall not
be declared or paid prior to December 15, 1999), (ii) split, combine or
reclassify any capital stock or partnership interests or issue or authorize the
issuance of any other securities in respect of, in lieu of or in substitution
for shares of such capital stock or partnership interests, or (iii) purchase,
redeem or otherwise acquire any shares of capital stock of Weeks or Weeks OP
Units or any options, warrants or rights to acquire, or security convertible
into, shares of capital stock of Weeks or such Weeks OP Units, except (A)
pursuant to the Weeks Exchange Agreements, (B) in connection with the use of
Weeks Common Stock to pay the exercise price or tax withholding obligation upon
the exercise of a Weeks Stock Option issued under any of the Weeks Stock Plans
as presently permitted under those Plans, or (C) pursuant to Weeks' dividend
reinvestment plan as presently in effect;

     (b)  issue, deliver, sell or grant any option or other right in respect of
any shares of capital stock, any other voting or redeemable securities
(including Weeks OP Units or other partnership interests) of Weeks or any Weeks
Subsidiary or any securities convertible into, or any rights, warrants or
options to acquire, any such shares, voting securities or convertible or
redeemable securities except to Weeks or a Weeks Subsidiary, except (i) as
permitted or required under the Weeks OP Agreement or Weeks' dividend
reinvestment plan as presently in effect, (ii) in connection with the exercise
of outstanding options under the Weeks Stock Options Plans, the exercise of the
AEW Warrant or the Codina Warrant or 

                                       29
<PAGE>
 
the exchange of Weeks OP Units for shares of Weeks Common Stock or Weeks
Preferred Stock, as applicable, pursuant to the Weeks Exchange Agreements and
(iii) as permitted under Section 4.1(e);

     (c)  amend Weeks' articles or by-laws, the Weeks OP Agreement or any other
comparable charter or organizational documents of any Weeks Subsidiary, except
as otherwise contemplated by this Agreement;

     (d)  merge, consolidate or enter into any other business combination
transaction with any Person;

     (e)  other than (x) as set forth in Section 4.1 of the Weeks Disclosure
Letter or (y) with Duke's prior written consent (such consent not to be
unreasonably withheld), (i) acquire or agree to acquire by merging or
consolidating with, or by purchasing all or a substantial portion of the equity
securities or assets of, or by any other manner, any business or any
corporation, partnership, limited liability company, joint venture, association,
business trust or other business organization or division thereof or interest
therein or any assets; (ii) mortgage or otherwise encumber or subject to any
Lien or sell, lease or otherwise dispose of any of its material properties or
assets or assign or encumber the right to receive income, dividends,
distributions and the like or agree to do any of the foregoing; or (iii) incur
any indebtedness for borrowed money or guarantee any such indebtedness of
another person, issue or sell any debt securities or warrants or other rights to
acquire any debt securities of Weeks, guarantee any debt securities of another
person, enter into any "keep well" or other agreement to maintain any financial
statement condition of another person or enter into any arrangement having the
economic effect of any of the foregoing, prepay or refinance any indebtedness or
make any loans, advances or capital contributions to, or investments in, any
other person;

     (f)  make any election relating to Taxes, other than an election which is
not reasonably expected to affect the amount or timing of items of income, gain,
loss or deductions of greater than $10,000,000 on a cumulative basis or Taxes in
any year of greater than $1,000,000 (unless, after prior consultation with Duke,
such action is  required by law or necessary to preserve Weeks' status as a REIT
or the status of Weeks OP or any other Weeks Subsidiary as a partnership for
federal tax purposes);

     (g)  (i)   change in any material manner any of its methods, principles or
practices of accounting in effect at the Weeks Financial Statement Date, or (ii)
settle or compromise any claim, action, suit, litigation, proceeding,
arbitration, investigation, audit or controversy relating to taxes, except in
the case of settlements or compromises relating to taxes on real property or
sales taxes in an amount not to exceed, individually or in the aggregate,
$5,000,000, or change any of its methods of reporting income or deductions for
federal income tax purposes from those employed in the preparation of its
federal income tax return for the taxable year ended December 31, 1997, except,
in the case of clause (i), as may be required by the SEC, applicable law or
GAAP;

     (h)  except as provided in this Agreement, adopt any new employee benefit
plan, incentive plan, severance plan, bonus plan, stock option or similar plan,
grant new stock appreciation rights or amend any existing plan or rights, or
enter into or amend any employment agreement or similar agreement or arrangement
or, except in the ordinary course consistent with past practice, grant or become
obligated to grant any increase in the compensation of officers or employees,
except such changes as are required by law or which are not more favorable to
participants than provisions presently in effect;

     (i)  settle any stockholder derivative or class action claims arising out
of or in connection with any of the transactions contemplated by this Agreement
or the OP Merger Agreement; and

                                       30
<PAGE>
 
     (j)  enter into or amend or otherwise modify any agreement or arrangement
with persons that are affiliates or, as of the date hereof, are officers or
directors of Weeks or any Weeks Subsidiary without prior written notice to Duke
and the approval of a majority of the "independent" members of the Board of
Directors of Weeks.

     Section 4.2.  Conduct of Business by Duke.  During the period from the date
                   ---------------------------                                  
of this Agreement to the Effective Time, Duke and Duke OP shall, and shall cause
the Duke Subsidiaries each to, carry on its businesses in the usual, regular and
ordinary course in substantially the same manner as heretofore conducted and, to
the extent consistent therewith, use commercially reasonable efforts to preserve
intact its current business organization, goodwill, ongoing businesses and
Duke's status as a REIT within the meaning of the Code.  Without limiting the
generality of the foregoing, the following additional restrictions shall apply:
During the period from the date of this Agreement to the Effective Time, except
as set forth in Section 4.2 of the Duke Disclosure Letter or as otherwise
contemplated by this Agreement, Duke shall not and shall cause the Duke
Subsidiaries (including Duke OP) not to (and not to authorize or commit or agree
to):

     (a)  (i)   declare, set aside or pay any dividends on, or make any other
distributions in respect of, any of Duke's capital stock or the Duke OP Units or
partnership interests, stock or other equity interests in any Duke Subsidiary
that is not directly or indirectly wholly owned by Duke except (v) in the case
of Duke, for regular quarterly dividends not in excess of $.34 per share of Duke
Common Stock and regular quarterly dividends not in excess of $.56875 per share
of Duke Series A Preferred Stock, $.99875 per share of Duke Series B Preferred
Stock, $.46094 per share of Duke Series D Preferred Stock, and $.515625 per
share of Duke Series E Preferred Stock, (w) in the case of Duke OP, for regular
quarterly distributions to the general and limited partners of Duke OP not in
excess of $.34 per Duke Common OP Unit and regular quarterly dividends on
outstanding Duke Preferred OP Units not in excess of $.56875 per Duke Series A
Preferred OP Unit, $.99875 per Duke Series B Preferred OP Unit, $.46094 per Duke
Series D Preferred OP Unit and $.515625 per Duke Series E Preferred OP Unit, (x)
any distributions by any other wholly owned Duke Subsidiaries, in each case with
customary record and payment dates, (y) the dividend required to be paid
pursuant to Section 2.2(d)(i) (and the corresponding Duke OP distribution) and
(z) other dividends necessary in order for Duke to maintain its status as a REIT
(which shall not be declared or paid prior to December 15, 1999), (ii) split,
combine or reclassify any capital stock or partnership interests or issue or
authorize the issuance of any other securities in respect of, in lieu of or in
substitution for shares of such capital stock or partnership interests, except
as permitted under Section 4.2(e) or as contemplated under the exchange
provisions of the Duke OP Agreement and the Duke Exchange Agreements or (iii)
purchase, redeem or otherwise acquire any shares of capital stock of Duke or
Duke OP Units or any options, warrants or rights to acquire, or security
convertible into, shares of capital stock of Duke or such Duke OP Units, except
(A) pursuant to the exchange provisions of the Duke OP Agreement and the Duke
Exchange Agreements, (B) in connection with the use of Duke Common Stock to pay
the exercise price or withholding tax obligation upon the exercise of any Duke
Stock Option issued under any of the Duke Stock Plans as presently permitted
under those Plans, or (C) pursuant to Duke's dividend reinvestment plan and
employee stock purchase plan, each as presently in effect;

     (b)  issue, deliver or sell, or grant any option or other right in 
respect of, any shares of capital stock, any other voting or redeemable 
securities (including Duke OP Units or other partnership interests) of Duke or
any Duke Subsidiary or any securities convertible into, or any rights, 
warrants or options to acquire, any such shares, voting securities or 
convertible or redeemable securities except to Duke or a Duke Subsidiary 
except (i) for bona fide financing transactions involving not more than 
               ---- ----
$150,000,000 in the aggregate, (ii) as permitted or required under the Duke OP
Agreement, the Duke Exchange Agreements, Duke's dividend reinvestment plan or
the Duke employee stock purchase plan, (iii) in connection with the exercise of
outstanding Duke Stock Options and (iv) as permitted by Section 4.2(e);

                                       31
<PAGE>
 
     (c)  amend the Charter, By-laws, Duke OP Agreement or other comparable
charter or organizational documents of Duke or any Duke Subsidiary except as
otherwise contemplated by this Agreement, and except as may be necessary to
effect the restructuring transactions described in Section 4.2 of the Duke
Disclosure Letter (the "DMI Restructuring") or as otherwise disclosed in Section
                        -----------------                                       
4.2 of the Duke Disclosure Letter;

     (d)  merge, consolidate or enter into any other business combination
with any Person, except (i) as contemplated by the DMI Restructuring and (ii) as
permitted under Section 4.2(e);

     (e)  other than (x) as set forth in Section 4.2 of the Duke Disclosure
Letter or (y) with Weeks' prior written consent (such consent not to be
unreasonably withheld), (i) acquire or agree to acquire by merging or
consolidating with, or by purchasing all or a substantial portion of the equity
securities or assets of, or by any other manner, any business or any
corporation, partnership, limited liability company, joint venture, association,
business trust or other business organization or division thereof or interest
therein or any assets; (ii) mortgage or otherwise encumber or subject to any
Lien or sell, lease or otherwise dispose of any of its material properties or
assets or assign or encumber the right to receive income, dividends,
distributions and the like or agree to do any of the foregoing; or (iii) incur
any indebtedness for borrowed money or guarantee any such indebtedness of
another person, issue or sell any debt securities or warrants or other rights to
acquire any debt securities of Duke or any Duke Subsidiary, guarantee any debt
securities of another person, enter into any "keep well" or other agreement to
maintain any financial statement condition of another person or enter into any
arrangement having the economic effect of any of the foregoing, prepay or
refinance any indebtedness or make any loans, advances or capital contributions
to, or investments in, any other person;

     (f)  (i)   change in any material manner any of its methods, principles or
practices of accounting in effect at the Duke Financial Statement Date, or (ii)
settle or compromise any claim, action, suit, litigation, proceeding,
arbitration, investigation, audit or controversy relating to taxes, except in
the case of settlements or compromises relating to taxes on real property or
sales taxes in an amount not to exceed, individually or in the aggregate,
$5,000,000, except, in the case of clause (i), as may be required by the SEC,
applicable law or GAAP;

     (g)  except as provided in this Agreement, adopt any new employee
benefit plan, incentive plan, severance plan, bonus plan, stock option or
similar plan, grant new stock appreciation rights or amend any existing plan or
rights, or enter into or amend any employment agreement or similar agreement or
arrangement (other than as contemplated under Section 5.11 or, except in the
ordinary course consistent with past practice, grant or become obligated to
grant any increase in the compensation of officers or employees, except such
changes as are required by law or which are not more favorable to participants
than provisions presently in effect; and

     (h)  enter into or amend or otherwise modify any agreement or
arrangement with persons that are affiliates or, as of the date hereof, are
officers or directors of Duke or any Duke Subsidiary not approved by a majority
of the "independent" members of the Board of Directors of Duke.

     Section 4.3.  Other Actions.  Each of Weeks and Duke shall use its
                   -------------                                       
commercially reasonable efforts not to, and shall use its commercially
reasonable efforts to cause its respective subsidiaries not to take any action
that would result in (i) any of the representations and warranties of such party
(without giving effect to any "knowledge" qualification) set forth in this
Agreement that are qualified as to materiality becoming untrue, (ii) any of such
representations and warranties (without giving effect to any "knowledge"
qualification) that are not so qualified becoming untrue in any material respect
or (iii) except as contemplated by Section 7.1, any of the conditions to the
REIT Merger set forth in Article VI not being satisfied.

                                       32
<PAGE>
 
                                   ARTICLE V

                             ADDITIONAL COVENANTS
                             --------------------

     Section 5.1.  Preparation of the Registration Statement and the Proxy
                   -------------------------------------------------------
Statement; Shareholders' Meetings; Partners' Consents.
- ----------------------------------------------------- 

     (a)  As soon as practicable following the date of this Agreement, Weeks and
Duke shall (i) prepare and file with the SEC a preliminary joint Proxy
Statement, with appropriate requests for confidential treatment, in form and
substance satisfactory to each of Duke and Weeks, and Duke will provide on a
supplemental basis to the SEC the Registration Statement, in which the Proxy
Statement will be included as a prospectus.  Each of Weeks and Duke shall use
its commercially reasonable efforts to cause and enable Duke to (i) respond to
any comments of the staff of the SEC and (ii) have the Registration Statement
declared effective under the Securities Act and the rules and regulations
promulgated thereunder as promptly as practicable after such filing and to keep
the Registration Statement effective as long as is necessary to consummate the
REIT Merger.  Each of Weeks and Duke will use its commercially reasonable
efforts to cause the Proxy Statement to be mailed to Weeks' shareholders and
Duke's shareholders, respectively, as promptly as practicable after the
Registration Statement is declared effective under the Securities Act.  Each
party will notify the other promptly of the receipt of any comments from the SEC
and of any request by the SEC for amendments or supplements to the Registration
Statement or the Proxy Statement or for additional information and will supply
the other with copies of all correspondence between such party or any of its
representatives and the SEC with respect to the Registration Statement or the
Proxy Statement.  The Registration Statement and the Proxy Statement shall
comply in all material respects with all applicable requirements of Law.
Whenever any event occurs which is required to be set forth in an amendment or
supplement to the Registration Statement or the Proxy Statement, Duke or Weeks,
as the case may be, shall promptly inform the other of such occurrences and
cooperate in filing with the SEC and/or mailing to the shareholders of Duke and
the shareholders of Weeks such amendment or supplement in a form reasonably
acceptable to Duke and Weeks.

     (b)  Weeks will, as soon as practicable following the date of this
Agreement, duly call, give notice of, convene and hold a meeting of its
shareholders (the "Weeks Shareholders Meeting") (but in no event shall such
                   --------------------------                              
meeting be held sooner than 20 business days following the date the Proxy
Statement is mailed to its shareholders), for the purpose of obtaining the Weeks
Shareholder Approvals.  Duke will, as soon as practicable following the date of
this Agreement, duly call, give notice of, convene and hold a meeting of its
shareholders (the "Duke Shareholders Meeting") (but in no event shall such
                   -------------------------                              
meeting be held sooner than 20 business days following the date the Proxy
Statement is mailed to its shareholders), for the purpose of obtaining the Duke
Shareholder Approvals.  Weeks and Duke will cooperate in good faith to seek to
ensure that the Weeks Shareholder Meeting and the Duke Shareholder Meeting are
held on the same day, as close together in time as is reasonably practicable.
Duke covenants that, subject to Section 7.1, Duke will, through its Board of
Directors, recommend to its shareholders approval of the REIT Merger, the OP
Merger, this Agreement, the OP Merger Agreement, the charter and bylaw
amendments, the election of directors and the other transactions contemplated
hereby and thereby and further covenants that the Proxy Statement will include
such recommendation.  Weeks covenants that, subject to Section 7.1, Weeks will,
through its Board of Directors, recommend to its shareholders approval of the
REIT Merger, the OP Merger, this Agreement, the OP Merger Agreement and the
other transactions contemplated hereby and thereby and further covenants that
the Proxy Statement will include such recommendation.  Duke shall furnish all
information concerning Duke and the holders of Duke Common Stock as may
reasonably be requested in connection with any action required to be taken under
any applicable state securities or "blue sky" laws in connection with the
issuance of Duke Common Stock pursuant to the REIT Merger, and Weeks shall
furnish all information concerning Weeks and the holders 

                                       33
<PAGE>
 
of Weeks Stock as may be reasonably requested in connection with any such
action. Each of Duke and Weeks will use their commercially reasonable efforts to
cause Duke to obtain, prior to the effective date of the Registration Statement,
all necessary state securities or "blue sky" permits or approvals required to
carry out the REIT Merger and the other transactions contemplated by this
Agreement. In connection with the preparation of the Proxy Statement and the
Registration Statement, Duke shall use reasonable efforts to cause to be
delivered to Weeks, prior to the mailing of the Proxy Statement to Weeks'
shareholders and Duke's shareholders, the opinion dated the date of the Proxy
Statement of Rogers & Wells LLP, substantially in the form attached hereto as
Exhibit L (subject to customary exceptions, assumptions and qualifications, and
- ---------                      
based on customary representations), regarding the qualification of Duke as a
REIT under the Code and the treatment of Duke OP as a partnership for federal
income tax purposes. In issuing its opinion, Rogers & Wells LLP shall be
permitted to rely on the opinion of King & Spalding as to the qualification of
Weeks as a REIT. In connection with the preparation of the Proxy Statement and
the Registration Statement, Weeks shall use reasonable efforts to cause to be
delivered to Duke, prior to the mailing of the Proxy Statement to Weeks'
shareholders and Duke's shareholders, the opinion dated the date of the Proxy
Statement of King & Spalding, substantially in the form attached hereto as
Exhibit K (subject to customary exceptions, assumptions and qualifications, and 
- ---------            
based on customary representations), regarding the qualification of Weeks as a
REIT under the Code and the treatment of Weeks OP as a partnership for federal
income tax purposes.

     Section 5.2.  Access to Information; Confidentiality.  Each of Weeks and
                   --------------------------------------                    
Duke shall, and shall cause each of its respective Subsidiaries to, afford to
the other party and to the officers, employees, accountants, counsel, financial
advisors and other representatives of such other party, reasonable access during
normal business hours during the period prior to the Effective Time to all their
respective properties, books, contracts, commitments, personnel and records and,
during such period, each of Weeks and Duke shall, and shall cause each of its
respective subsidiaries to, furnish promptly to the other party (a) a copy of
each report, schedule, registration statement and other document filed by it
during such period pursuant to the requirements of federal or state securities
laws and (b) all other information concerning its business, properties and
personnel as such other party may reasonably request.  Each of Weeks and Duke
will hold, and will cause its respective subsidiaries' officers, employees,
accountants, counsel, financial advisors and other representatives and
affiliates to hold, any nonpublic information in confidence to the extent
required by, and in accordance with, and will comply with the provisions of the
letter agreement between Weeks and Duke dated as of February 3, 1999, as amended
to date (as so amended, the "Confidentiality Agreement").
                             -------------------------   

     Section 5.3.  Commercially Reasonable Efforts; Notification.
                   --------------------------------------------- 

     (a)  Upon the terms and subject to the conditions set forth in this
Agreement, each of Duke and Weeks agrees to use its commercially reasonable
efforts to take, or cause to be taken, all actions, and to do, or cause to be
done, and to assist and cooperate with the other in doing, all things necessary,
proper or advisable to fulfill all conditions applicable to such party pursuant
to this Agreement and to consummate and make effective, in the most expeditious
manner practicable, the REIT Merger, the OP Merger and the other transactions
contemplated hereby and by the OP Merger Agreement, including (i) the obtaining
of all necessary actions or nonactions, waivers, consents and approvals from
Governmental Entities and the making of all necessary registrations and filings
and the taking of all reasonable steps as may be necessary to obtain an
approval, waiver or exemption from, or to avoid an action or proceeding by, any
Governmental Entity, (ii) the obtaining of all necessary consents, approvals,
waivers or exemption from non-governmental third parties; provided, however,
that if either party is obliged to make expenditures, or incur costs, expenses
or other liabilities to obtain the consent of any non-governmental party, it
shall consult reasonably with the other party upon reasonable notice prior to
making payment of any such amount, and in no event shall either Weeks or Duke
make payment of any such amount in excess of $5,000,000 in obtaining such
consents without obtaining the prior written 

                                       34
<PAGE>
 
consent of the other, which consent shall not unreasonably be withheld or
delayed, (iii) the defending of any lawsuits or other legal proceedings, whether
judicial or administrative, challenging the REIT Merger, this Agreement or the
OP Merger Agreement or the consummation of the transactions contemplated by this
Agreement or the OP Merger Agreement, including seeking to have any stay or
temporary restraining order entered by any court or other Governmental Entity
vacated or reversed, and (iv) the execution and delivery of any additional
instruments necessary to consummate the transactions contemplated by and to
fully carry out the purposes of, this Agreement or the OP Merger Agreement. In
connection with and without limiting the foregoing, Weeks, Duke and their
respective Boards of Directors shall (i) take all action necessary so that no
"fair price," "business combination," "moratorium," "control share acquisition"
or any other anti-takeover statute or similar statute enacted under state or
federal laws of the United States or similar statute or regulation (a "Takeover
                                                                       --------
Statute") is or becomes applicable to the REIT Merger, the OP Merger, this 
- -------
Agreement, the OP Merger Agreement or any of the other transactions contemplated
hereby or thereby and (ii) if any Takeover Statute becomes applicable to the
REIT Merger, the OP Merger, this Agreement, the OP Merger Agreement or any other
transaction contemplated hereby, take all action necessary so that the REIT
Merger, the OP Merger, this Agreement, the OP Merger Agreement and the other
transactions contemplated hereby or thereby may be consummated as promptly as
practicable on the terms contemplated by this Agreement and the OP Merger
Agreement and otherwise to minimize the effect of such Takeover Statute on the
REIT Mergers, the OP Merger and the other transactions contemplated by this
Agreement and the OP Merger Agreement. From the date hereof through the
Effective Time, Weeks and Weeks OP shall timely file with the SEC all Weeks SEC
Documents required to be so filed. From the date hereof through the Effective
Time, Duke and Duke OP shall timely file with the SEC all Duke SEC Documents
required to be so filed.

     (b)  Weeks shall give prompt notice to Duke, and Duke shall give prompt
notice to Weeks, if (i) any representation or warranty made by it contained in
this Agreement that is qualified as to materiality becomes untrue or inaccurate
in any respect or any such representation or warranty that is not so qualified
becomes untrue or inaccurate in any material respect or (ii) it fails to comply
with or satisfy in any material respect any covenant, condition or agreement to
be complied with or satisfied by it under this Agreement; provided, however,
                                                          --------  ------- 
that no such notification shall affect the representations, warranties,
covenants or agreements of the parties or the conditions to the obligations of
the parties under this Agreement.

     Section 5.4.  Affiliates.  Prior to the Closing Date, Weeks and Duke shall
                   ----------                                                  
exchange letters identifying all persons who are, at the time this Agreement is
submitted for approval to the shareholders of Weeks and Duke, their respective
"affiliates" for purposes of Rule 145 under the Securities Act.  Weeks and Duke
shall use their respective commercially reasonable efforts to cause each of
their respective affiliates to deliver on or prior to the Closing Date a written
agreement substantially in the form attached as Exhibit I hereto.

     Section 5.5.  Tax Treatment.  Each of Duke and Weeks shall use its
                   -------------                                       
commercially reasonable efforts to (a) cause the REIT Merger to qualify as a
tax-free reorganization under Section 368(a) of the Code, (b) cause the OP
Merger to qualify as a tax-deferred exchange for Weeks and the other holders of
Weeks OP Units, and (c)  obtain the opinions of counsel referred to in Sections
5.1(b), 6.2(e) and 6.3(e).

     Section 5.6.  No Solicitation of Transactions.  Subject to Section 7.1,
                   -------------------------------                          
each of Duke and Weeks shall not directly or indirectly, through any officer,
director, employee, agent, investment banker, financial advisor, attorney,
accountant, broker, finder or other representative, initiate, solicit, encourage
or facilitate (including by way of furnishing nonpublic information or
assistance) any inquiries or the making of any proposal or other action that
constitutes, or may reasonably be expected to lead to, any Competing Transaction
(as defined below), or enter into or maintain or continue discussions or
negotiate with any person in furtherance of such inquiries or to obtain a
Competing Transaction, or agree to or 

                                       35
<PAGE>
 
endorse any Competing Transaction, or authorize or permit any of its officers,
directors, employees or agents, attorneys, investment bankers, financial
advisors, accountants, brokers, finders or other representatives to take any
such action. Each of Duke and Weeks shall notify the other in writing (as
promptly as practicable) of all of the relevant details relating to all
inquiries and proposals which it or any of its Subsidiaries or any such officer,
director, employee, agent, investment banker, financial advisor, attorney,
accountant, broker, finder or other representative may receive relating to any
of such matters and if such inquiry or proposal is in writing, each of Duke and
Weeks shall deliver to the other a copy of such inquiry or proposal. For
purposes of this Agreement, "Competing Transaction" shall mean any of the 
                             --------------------- 
following (other than the transactions expressly provided for in this
Agreement): (i) any merger, consolidation, share exchange, business combination
or similar transaction involving Duke (or any of its Subsidiaries, including
Duke OP) or Weeks (or any of its Subsidiaries, including Weeks OP), as the case
may be; (ii) any sale, lease, exchange, mortgage, pledge, transfer or other
disposition of 20% or more of the assets of Duke and its Subsidiaries, taken as
a whole or Weeks and its Subsidiaries, taken as a whole, as the case may be, in
a single transaction or series of related transactions, excluding any bona fide
financing transactions which do not, individually or in the aggregate, have as a
purpose or effect the sale or transfer of control of such assets; (iii) any
tender offer or exchange offer for 20% or more of the outstanding equity
securities of Duke (or any of its Subsidiaries, including Duke OP), or Weeks (or
any of its Subsidiaries, including Weeks OP); or (iv) any public announcement of
a proposal, plan or intention to do any of the foregoing or any agreement to
engage in any of the foregoing.

     Section 5.7.  Public Announcements.  Duke, Duke OP,  Weeks and Weeks OP
                   --------------------                                     
will consult with each other before issuing, and provide each other the
opportunity to review and comment upon, any press release or other public
statements with respect to the REIT Merger, the OP Merger or any other
transactions contemplated by this Agreement or the OP Merger Agreement, and
shall not issue any such press release or make any such public statement prior
to such consultation, except as may be required by applicable law, court process
or by obligations pursuant to any listing agreement with any national securities
exchange.  The parties agree that the initial press release to be issued with
respect to the REIT Merger and the OP Merger will be in the form agreed to by
the parties hereto prior to the execution of this Agreement.

     Section 5.8.  NYSE Listing.  Duke shall prepare and submit to the NYSE a
                   ------------                                              
supplemental listing application covering the Duke Common Stock, Duke Series F
Preferred Stock and Duke Series H Preferred Stock issuable in the REIT Merger
and shall use its commercially reasonable efforts to have the NYSE approve for
listing, upon official notice of issuance, the Duke Common Stock, Duke Series F
Preferred Stock  and any Duke Series H Preferred Stock to be issued in the REIT
Merger.

     Section 5.9.  Letters of Accountants
                   ----------------------

     (a)  Weeks shall use its reasonable best efforts to cause to be delivered
to Duke and Weeks "comfort" letters of Arthur Andersen LLP, Weeks' independent
public accountants, dated and delivered the date on which the Registration
Statement shall become effective and as of the Effective Time, and addressed to
Duke and Weeks, in form and substance reasonably satisfactory to Duke and Weeks
and reasonably customary in scope and substance for letters delivered by
independent public accountants in connection with transactions such as those
contemplated by this Agreement and the OP Merger Agreement.

     (b)  Duke shall use its reasonable best efforts to cause to be delivered to
Weeks and Duke "comfort" letters of KPMG Peat Marwick, Duke's independent public
accountants, dated and delivered the date on which the Registration Statement
shall become effective and as of the Effective Time, and addressed to Weeks and
Duke, in form and substance reasonably satisfactory to Weeks and Duke and
reasonably customary in scope and substance for letters delivered by independent
public accountants in 

                                       36
<PAGE>
 
connection with transactions such as those contemplated by this Agreement and
the OP Merger Agreement.

     Section 5.10.  Transfer and Gains Taxes; Shareholder Demand Letters.  Duke
                    ----------------------------------------------------       
and Weeks shall cooperate in the preparation, execution and filing of all
returns, questionnaires, applications or other documents regarding any real
property transfer or gains, sales, use, transfer, value added stock transfer and
stamp taxes, any transfer, recording, registration and other fees and any
similar taxes which become payable in connection with the transactions
contemplated by this Agreement or the OP Merger Agreement (together with any
related interests, penalties or additions to tax, "Transfer and Gains Taxes").
                                                   ------------------------    
From and after the Effective Time, Duke shall cause Duke OP to pay or cause to
be paid all Transfer and Gains Taxes. Within 30 days after the Effective Time,
Duke shall send the shareholder demand letters required by Treasury Regulation
(S) 1.857-8 to the appropriate shareholders of Weeks for Weeks' taxable year
ended on the Effective Time.

     Section 5.11.  Benefit Plans and Other Employee Arrangements.
                    --------------------------------------------- 

     (a)  Benefit Plans.  Subject to subsection (b) below, upon and after the
          -------------                                                      
Effective Time, Duke and Duke OP (or their respective successors or assigns)
shall provide benefits to former employees of Weeks and its Subsidiaries that
are no less favorable in the aggregate to such employees than those provided to
other similarly situated employees of Duke and Duke OP at any applicable time
after the termination of the benefits provided to such employees by Weeks and
the Weeks Subsidiaries.  With respect to any Duke Benefit Plan which is an
"employee benefit plan" as defined in Section 3(3) of ERISA and any other
service based benefits (including vacations) in which employees of Weeks or Duke
or their respective Subsidiaries may participate, solely for purposes of
determining eligibility to participate, vesting and entitlement to benefits but
not for purposes of accrual of pension benefits, service with Weeks, Duke or any
of their respective Subsidiaries shall be treated as service with Duke or Duke
OP, as the case may be; provided, however, that such service shall not be
                        --------  -------                                
recognized to the extent that such recognition would result in a duplication of
benefits under both a Weeks Benefit Plan and a Duke Benefit Plan (or is not
otherwise recognized for such purposes under the benefit plans of Duke or Duke
OP).

     (b)  Stock Incentive Plans.
          --------------------- 

          (i)   As of the Effective Time, each outstanding Weeks Stock Option
shall be assumed by Duke and shall be deemed to constitute an option to 
acquire, on the same terms and conditions as were applicable under such Weeks 
Stock Option (including, without limitation, vesting and exercisability but 
without regard to any provisions that would result in the acceleration of such
vesting or exercisability due to the execution and delivery of this Agreement
or the consummation of the transactions contemplated by this Agreement), the 
same number of shares of Duke Common Stock as the holder of such Weeks Stock 
Option would have been entitled to receive pursuant to the REIT Merger had 
such holder exercised such Weeks Stock Option in full immediately prior to the
Effective Time at a price per share equal to the aggregate exercise price for 
the shares subject to such Weeks Stock Option divided by the number of full 
shares of Duke Common Stock deemed to be purchasable pursuant to such Weeks 
Stock Option; provided, however, that the number of shares of Duke Common 
              --------  -------
Stock that may be purchased upon exercise of such Weeks Stock Option shall not
include any fractional share but shall be rounded upward to the next whole
number of shares, or if rounding up would disqualify an option as an incentive
stock option, shall be rounded down to the nearest whole number and cash shall
be paid to each affected optionee as compensation for such fractional share
based on the fair market value of Duke Common Stock at the Effective Time.
Shares of Duke Common Stock received pursuant to the terms of this Agreement, in
consideration for shares of Weeks Common Stock which have been held by Weeks
executives and which are unvested and subject to forfeiture at the Effective
Time pursuant to a restricted 

                                       37
<PAGE>
 
stock award under a Weeks Stock Plan shall vest and be subject to forfeiture in
accordance with the terms of the applicable restricted stock award of Weeks
Common Stock in the absence of the transactions contemplated by this Agreement.
Prior to the Effective Time, Weeks will use its commercially reasonable efforts
to obtain any necessary consents and shall (to the extent permitted under the
terms of the Weeks Stock Plans) make any amendments to and take any actions in
respect of any Weeks Stock Plans, Weeks Stock Options or restricted stock award
to the extent such consents or amendments are necessary to give effect to the
foregoing (including without limitation, the elimination of any right to
acceleration of exercisability or vesting as a result of the completion of the
transactions contemplated by this Agreement).

          (ii)  Each Duke Stock Option shall continue in accordance with its
term and conditions, including, without limitation, vesting and exercisability
without regard to any acceleration of such vesting and exercisability as a
result of the transactions contemplated by this Agreement. Prior to the
Effective Time, Duke will use its best efforts to obtain any necessary consents
and make any amendments to any Duke Stock Plans or Duke Weeks Stock Options to
the extent such consents or amendments are necessary to give effect to the
foregoing.

          (iii) At the Effective Time, Duke shall assume the Weeks Stock Plans
(such Weeks Stock Plans having been amended as appropriate to take into account
the adjustments set forth in Section 5.11(b)(i)), and the compensation committee
of the Board of Directors of Duke shall administer the Weeks Stock Plans.  At
the Effective Time, the Weeks Stock Plans shall be amended such that no further
options shall be issued thereunder.

     (c)  Change in Control Agreements.  At the Effective Time, Weeks shall
          ----------------------------                                     
assign and Duke shall assume by operation of this Agreement Weeks' obligations
under Weeks' Change in Control Agreements identified in Section 5.11(c) of the
Weeks Disclosure Letter.

     Section 5.12.  Indemnification; Directors' and Officers' Insurance.
                    --------------------------------------------------- 

     (a)  (i)   Weeks shall, and, from and after the Effective Time, the
Surviving Corporation and the Surviving Partnership (collectively, the
"Indemnifying Parties") shall, indemnify, defend and hold harmless each person
 --------------------                                                         
who is now or has been at any time prior to the date hereof or who becomes prior
to the Effective Time, an officer or director of Weeks or any Weeks Subsidiary
(the "Indemnified Parties") against all losses, claims, damages, costs, expenses
      -------------------                                                       
(including attorneys' fees and expenses), liabilities or judgments or amounts
that are paid in settlement of, with the approval of the Indemnifying Parties
(which approval shall not be unreasonably withheld or delayed), or otherwise in
connection with any threatened or actual claim, action, suit, proceeding or
investigation based on or arising out of the fact that such person is or was a
director or officer of Weeks or any Weeks Subsidiary at or prior to the
Effective Time, whether asserted or claimed prior to, or at or after, the
Effective Time "Indemnified Liabilities"), including all Indemnified Liabilities
                -----------------------                                         
based on, or arising out of, or pertaining to this Agreement, the REIT Merger,
the OP Merger or the transactions contemplated by this Agreement or the OP
Merger Agreement, in each case to the full extent a corporation is permitted
under the GBCC to indemnify its own directors or officers, as the case may be
(and the Surviving Corporation will pay expenses in advance of the final
disposition of any such action or proceeding to each Indemnified Party to the
full extent permitted by law subject to the limitations set forth in Section
5.12(a)(iii)).

          (ii)  Any Indemnified Parties proposing to assert the right to be
indemnified under this Section 5.12 shall, promptly after receipt of notice of
commencement of any action against such Indemnified Parties in respect of which
a claim is to be made under this Section 5.12 against Weeks and, from and after
the Effective Time, the Surviving Corporation, notify the Indemnifying Parties
of the commencement of such action, enclosing a copy of all papers served.  If
any such action is brought 

                                       38
<PAGE>
 
against any of the Indemnified Parties and such Indemnified Parties notify the
Indemnifying Parties of its commencement, the Indemnifying Parties will be
entitled to participate in and, to the extent that they elect by delivering
written notice to such Indemnified Parties promptly after receiving notice of
the commencement of the action from the Indemnified Parties, to assume the
defense of the action and after notice from the Indemnifying Parties to the
Indemnified Parties of their election to assume the defense, the Indemnifying
Parties will not be liable to the Indemnified Parties for any legal or other
expenses except as provided below and except for the reasonable costs of
investigation subsequently incurred by the Indemnified Parties in connection
with the defense. If the Indemnifying Parties assume the defense, the
Indemnifying Parties shall have the right to settle such action without the
consent of the Indemnified Parties; provided, however, that the Indemnifying
                                    --------  -------          
Parties shall be required to obtain such consent (which consent shall not be
unreasonably withheld) if the settlement includes any admission of wrongdoing on
the part of the Indemnified Parties or any decree or restriction on the
Indemnified Parties or their officers or directors; provided, further, that no
                                                    --------  ------- 
Indemnifying Parties, in the defense of any such action shall, except with the
consent of the Indemnified Parties (which consent shall not be unreasonably
withheld), consent to entry of any judgment or enter into any settlement that
does not include as an unconditional term thereof the giving by the claimant or
plaintiff to such Indemnified Parties of a release from all liability with
respect to such action. The Indemnified Parties will have the right to employ
their own counsel in any such action, but the fees, expenses and other charges
of such counsel will be at the expense of such Indemnified Parties unless (i)
the employment of counsel by the Indemnified Parties has been authorized in
writing by the Indemnifying Parties, (ii) the Indemnified Parties have
reasonably concluded (based on advice of counsel) that there may be legal
defenses available to them that are different from or in addition to those
available to the Indemnifying Parties, (iii) a conflict or potential conflict
exists (based on advice of counsel to the Indemnified Parties) between the
Indemnified Parties and the Indemnifying Parties (in which case the Indemnifying
Parties will not have the right to direct the defense of such action on behalf
of the Indemnified Parties) or (iv) the Indemnifying Parties have not in fact
employed counsel to assume the defense of such action within a reasonable time
after receiving notice of the commencement of the action, in each of which cases
the reasonable fees, disbursements and other charges of counsel will be at the
expense of the Indemnifying Parties.

          (iii) It is understood that the Indemnifying Parties shall not, in
connection with any proceeding or related proceedings in the same jurisdiction,
be liable for the reasonable fees, disbursements and other charges of more than
one separate firm admitted to practice in such jurisdiction at any one time for
all such Indemnified Parties unless (a) the employment of more than one counsel
has been authorized in writing by the Indemnifying Parties, (b) any of the
Indemnified Parties have reasonably concluded (based on advice of counsel) that
there may be legal defenses available to them that are different from or in
addition to those available to other Indemnified Parties or (c) a conflict or
potential conflict exists (based on advice of counsel to the Indemnified
Parties) between any of the Indemnified Parties and the other Indemnified
Parties, in each case of which the Indemnifying Parties shall be obligated to
pay the reasonable fees and expenses of such additional counsel or counsels.

          (iv)  The Indemnifying Parties will not be liable for any settlement
of any action or claim effected without their written consent (which consent
shall not be unreasonably withheld).

     (b)  At the Effective Time, Duke shall expressly assume by operation of
this Agreement (i) the Weeks Indemnity Agreements identified in Section 5.12(b)
of the Weeks Disclosure Letter and (ii) the indemnification obligations
contained in the Weeks OP Agreement.

     (c)  At or prior to the Effective Time, Duke shall purchase directors' and
officers' liability insurance "tail" policy coverage for Weeks' directors and
executive officers for a period of six years which will provide the directors
and officers with coverage on substantially similar terms as currently provided
by Weeks to such directors and officers for claims based on activity prior to
the Effective Time; 

                                       39
<PAGE>
 
provided, however, that Duke shall have no obligation to pay more than $250,000
in premiums for such coverage.

     (d)  The provisions of this Section 5.12 are intended to be for the benefit
of, and shall be enforceable by, each Indemnified Party, his or her heirs and
his or her personal representatives and shall be binding on all successors and
assigns of Duke and Weeks.

     Section 5.13.  Provisions Relating to Certain Weeks Indebtedness.
                    -------------------------------------------------  
Notwithstanding any other provision of this Agreement, Weeks and Duke shall
utilize reasonable best efforts and cooperate with each other to cause the
condition specified in Section 6.2(f) and 6.3(f) to be satisfied on or prior to
the Closing Date.

     Section 5.14.  The Weeks Rights Plan.  Weeks shall either (i) redeem,
                    ---------------------                                 
effective immediately prior to the Effective Time, all the then outstanding
Rights (as defined in the Rights Agreement) for cash pursuant to and in
compliance with Section 23 of the Rights Agreement or (ii) take such other
action to terminate the Rights Agreement as of that time, as Weeks and Duke may
mutually agree.  Weeks shall not redeem the Rights issued under the Rights
Agreement, or terminate the Rights Agreement, prior to the Effective Time (other
than in accordance with the preceding sentence) unless required to do so by a
court of competent jurisdiction; provided, however, that Weeks may take any of
the foregoing actions if the Board of Directors of Weeks shall have accepted a
proposal for a Superior Competing Transaction in accordance with the terms of
Section 7.1.

     Section 5.15.  Coordination of Dividends.  Each of Duke and Weeks shall
                    -------------------------                               
coordinate with the other regarding the declaration and payment of dividends in
respect of Duke Common Stock and Weeks Common Stock and the record dates and
payment dates relating thereto, it being the intention of Duke and Weeks that
any holder of Weeks Common Stock shall not receive two dividends, or fail to
receive one dividend, for any single calendar quarter with respect to such
holder's Weeks Common Stock and/or Duke Common Stock such holder receives in
exchange therefor pursuant to the REIT Merger.  Each of Duke OP and Weeks OP
shall coordinate with the other regarding the declaration and payment of
distributions in respect of Duke common OP units and Weeks common OP units and
the record dates and payment dates relating thereto, it being the intention of
Duke OP and Weeks OP that any holder of Weeks common OP units shall not receive
two distributions, or fail to receive one distribution, for any single calendar
quarter with respect to such holder's Weeks OP common units and/or Duke common
OP Units any such holder receives in exchange therefore pursuant to the OP
Merger.

     Section 5.16.  Existing Restrictions on Resale of Certain Falcon
                    -------------------------------------------------
Properties.  Duke and Duke OP shall assume the obligations of Weeks, Weeks OP or
the applicable Weeks Subsidiary, as the case may be, under the Tax Protection
Agreements described in Schedule 3.1(m) to the Weeks Disclosure Letter.

     Section 5.17.  Assumption of Warrants.  Subject to the terms of their
                    ----------------------                                
respective governing instruments, each AEW Warrant and each Codina Warrant
(collectively, the "Warrants") issued and outstanding at the Effective Time
                    --------                                               
shall remain outstanding following the Effective Time.  At the Effective time,
the AEW Warrant Agreement and each outstanding AEW Warrant and the Codina
Warrant Agreement and each outstanding Codina Warrant shall be assumed by the
Surviving Entity.  Each such Warrant shall be deemed to constitute a warrant to
acquire, on the same terms and conditions as were applicable under such Warrant,
a number of shares of Duke Common Stock equal to the number of shares of Duke
Common Stock purchasable pursuant to such Warrant multiplied by the Exchange
Ratio (plus the amount of cash consideration, if any, payable with respect to
the number of shares of Duke Common Stock issuable upon the exercise of such
Warrant immediately prior to the Effective Time), at a price per share equal to
the per-share exercise price for the shares of Weeks Common Stock purchasable
pursuant to such Warrant divided by the Exchange Ratio.  Any fractional
interests shall be rounded up to one share 

                                       40
<PAGE>
 
of Duke Common Stock (with all fractional interests to which a holder would
otherwise be entitled being aggregated before any such rounding). Duke shall
take all action necessary to reserve for issuance a sufficient number of shares
of Duke Common Stock for delivery upon exercise of the Warrants assumed in
accordance with this Section 5.17.

     Section 5.18.  Weeks Notes.  At the Closing, Duke OP shall (a) execute and
                    -----------                                                
deliver a supplemental indenture evidencing its assumption of the payment of
principal of (and premium, if any) and interest on Weeks OP's outstanding 6.875%
Notes and 7.375% Notes and the due and punctual performance and observance of
each covenant and agreement of the Indenture dated March 20, 1997 and a
Supplemental Indenture dated July 30, 1998 between Weeks OP and State Street
Bank and Company, as Trustee, and (b) cause to be delivered to the trustee an
opinion of counsel to the effect that all agreements or instruments effecting
such assumption are enforceable in accordance with their terms and comply with
the terms of such Indenture.

     Section 5.19.  Duke OP Partnership Agreement.  At the Closing, Duke OP
                    -----------------------------                          
shall (i) amend the partnership agreement of Duke OP to reflect the agreements
described on Exhibit J hereto and (ii) assume and perform any obligations that
Weeks OP or any Weeks Subsidiary has immediately prior to the Effective Time to
issue securities in accordance with the terms of any partnership or other
agreement to which Weeks OP or such Subsidiary is a party and which has been
previously disclosed to Duke, in the same manner and to the same extent that
Weeks OP or such Subsidiary would be required to perform such obligation if no
Merger had been consummated.

     Section 5.20.  Registration Rights Agreements.  At the Closing, Weeks shall
                    ------------------------------                              
assign and Duke shall assume by operation of this Agreement, Weeks' Registration
Rights Agreements identified in Section 5.20 of the Weeks Disclosure Letter.

     Section 5.21.  Interim Transactions Committee.  Weeks and Duke shall
                    ------------------------------                       
establish an interim transactions committee (the "Interim Transactions
Committee") consisting of three individuals nominated by each.  The Interim
Transactions Committee shall review and jointly evaluate (but will not have the
power to approve or disapprove) acquisition, budget and capital improvement
activities of each of Weeks and Duke between the date hereof and the Effective
Time.

     Section 5.22.  Executive Officer Appointments.  Prior to the Closing, the
                    ------------------------------                         
Board of Directors of Duke shall take such action as may be necessary or
advisable to ensure the appointment of the persons named on Schedule G hereto as
the executive officers of the Surviving Corporation (or, if any such person
should for any reason be unable or unwilling to serve, such other person or
persons as shall be mutually agreed by Duke and Weeks), such appointments to be
effective immediately following the Closing, each of whom shall serve in such
position indicated on Schedule F until such time indicated on Schedule F hereto
(the "Executive Officer Appointments").
      ------------------------------   

                                  ARTICLE VI

                             CONDITIONS PRECEDENT
                             --------------------

     Section 6.1.  Conditions to Each Party's Obligation to Effect the Merger.
                   ----------------------------------------------------------  
The respective obligations of Weeks and Duke to effect the REIT Merger and the
OP Merger and to consummate the other transactions contemplated by this
Agreement on the Closing Date is subject to the satisfaction or waiver on or
prior to the Effective Time of the following conditions:

     (a)  Shareholder Approvals. The Weeks Shareholder Approvals and the Duke
          ---------------------                                              
Merger Shareholder Approval shall have been obtained.

                                       41
<PAGE>
 
     (b)  Listing of Shares.  The NYSE shall have approved for listing the Duke
          -----------------                                                 
Common Stock, Duke Series F Preferred Stock and any Duke Series H Preferred
Stock to be issued in the REIT Merger and the Duke Common Stock, Duke Series F
Preferred Stock and any Duke Series H Preferred Stock reserved for issuance upon
redemption of Colt OP Units issued in the OP Merger, subject to official notice
of issuance.

     (c)  Registration Statement.  The Registration Statement shall have become
          ----------------------                                               
effective under the Securities Act and shall not be the subject of any stop
order or proceedings by the SEC seeking a stop order.

     (d)  No Injunctions or Restraints.  No temporary restraining order,
          ----------------------------                                  
preliminary or permanent injunction or other order issued by any court of
competent jurisdiction or other legal restraint or prohibition preventing the
consummation of the REIT Merger or the OP Merger or any of the other
transactions or agreements contemplated by this Agreement or the OP Merger
Agreement shall be in effect.

     (e)  HSR Act.  All waiting periods under the HSR Act shall have terminated
          -------                                                              
or expired with regard to the REIT Merger and the OP Merger.

     Section 6.2.  Conditions to Obligations of Duke.  The obligation of Duke to
                   ---------------------------------                            
effect the REIT Merger and the OP Merger and to consummate the other
transactions contemplated by this Agreement and the OP Merger Agreement on the
Closing Date are further subject to the following conditions, any one or more of
which may be waived by Duke:

     (a)  Representations and Warranties.  The representations and warranties of
          ------------------------------                                        
Weeks set forth in this Agreement shall be true and correct in all material
respects on and as of the Closing Date, as though made on and as of the Closing
Date, except to the extent the representation or warranty is expressly limited
by its terms to another date, and Duke shall have received a certificate (which
certificate may be qualified by knowledge to the same extent as such
representations and warranties are so qualified) signed on behalf of Weeks by
the Chief Executive Officer and the Chief Financial Officer of Weeks to such
effect.  This condition shall be deemed to have been satisfied unless (i) the
representations and warranties of Weeks contained in Section 3.1(c) are not true
and correct in all material respects or (ii) all breaches of Weeks'
representations and warranties in this Agreement (without giving effect to any
materiality, Weeks Material Adverse Effect or any similar qualification or
limitation) are in the aggregate reasonably expected to have a Weeks Material
Adverse Effect or a material adverse effect on the business, properties,
financial condition or results of operations of the Surviving Corporation (a
"Surviving Corporation Material Adverse Effect").
- ----------------------------------------------   

     (b)  Performance of Obligations of Weeks and Weeks OP.  Each of Weeks and
          ------------------------------------------------                    
Weeks OP shall have performed in all material respects all obligations required
to be performed by it under this Agreement and the OP Merger Agreement at or
prior to the Effective Time, and Duke shall have received a certificate signed
on behalf of Weeks by the Chief Executive Officer and the Chief Financial
Officer of Weeks to such effect.

     (c)  Material Adverse Change.  Since the date of this Agreement, there 
          -----------------------
shall have been no Weeks Material Adverse Change.  Duke shall have received a
certificate of the Chief Executive Officer and Chief Financial Officer of Weeks
to the effect that there has been no such Weeks Material Adverse Change.

     (d)  Opinions Relating to REIT and Partnership Status.  Duke shall have
          ------------------------------------------------                  
received an opinion dated as of the Closing Date of King & Spalding,
substantially in the form of Exhibit K attached hereto 
                             ---------                 

                                       42
<PAGE>
 
(subject to customary exceptions, assumptions and qualifications, and based on
customary representations), regarding the qualification of Weeks as a REIT under
the Code and the treatment of Weeks OP as a partnership for federal income tax
purposes. King & Spalding shall permit Rogers & Wells LLP to rely on its opinion
for purposes of delivering the opinion required by Section 6.3(d).

     (e)  Other Tax Opinion.  Duke shall have received an opinion dated as of
          -----------------
the Closing Date from Rogers & Wells LLP to the effect that the REIT Merger will
qualify as a tax-free reorganization Duke under Section 368(a) of the Code.

     (f)  Consents.  All consents and waivers from third parties necessary in
          --------                                                           
connection with the consummation of the REIT Merger and the OP Merger shall have
been obtained, other than such consents and waivers from third parties, which,
if not obtained, would not result, individually or in the aggregate, in a Weeks
Material Adverse Effect or a Duke Material Adverse Effect.

     Section 6.3.  Conditions to Obligation of Weeks and Weeks OP.  The
                   ----------------------------------------------      
obligations of Weeks and Weeks OP to effect the REIT Merger and the OP Merger
and to consummate the other transactions contemplated by this Agreement to occur
on the Closing Date is further subject to the following conditions, any one or
more of which may be waived by Weeks:

     (a)  Representations and Warranties.  The representations and warranties of
          ------------------------------                                        
Duke set forth in this Agreement shall be true and correct in all material
respects on and as of the Closing Date, as though made on and as of the Closing
Date, except to the extent the representation or warranty is expressly limited
by its terms to another date, and Weeks shall have received a certificate (which
certificate may be qualified by knowledge to the same extent as such
representations and warranties are so qualified) signed on behalf of Duke by the
Chief Executive Officer and the Chief Financial Officer of Duke to such effect.
This condition shall be deemed to have been satisfied unless (i) the
representations and warranties of Duke contained in Section 3.2(c) are not true
and correct in all material respects or (ii) all breaches of Duke's
representations and warranties in this Agreement (without giving effect to any
materiality, Duke Material Adverse Effect or other similar qualification or
limitation) are in the aggregate reasonably expected to have a Duke Material
Adverse Effect or a Surviving Corporation Material Adverse Effect.

     (b)  Performance of Obligations of Duke and Duke OP.  Each of Duke and Duke
          ----------------------------------------------                        
OP shall have performed in all material respects all obligations required to be
performed by it under this Agreement and the OP Agreement at or prior to the
Effective Time, and Duke shall have received a certificate signed on behalf of
Duke by the Chief Executive Officer and the Chief Financial Officer of Duke to
such effect.

     (c)  Material Adverse Change.  Since the date of this Agreement, there 
          -----------------------
shall have been no Duke Material Adverse Change.  Duke shall have received a
certificate of the Chief Executive Officer and Chief Financial Officer of Duke
to the effect that there has been no such Duke Material Adverse Change.

     (d)  Opinions Relating to REIT and Partnership Status.  Weeks shall have
          ------------------------------------------------                   
received an opinion dated as of the Closing Date of Rogers & Wells LLP,
substantially in the form of Exhibit L attached hereto (subject to customary
                             ---------                                      
exceptions, assumptions and qualifications, and based on customary
representations), regarding the qualification of Duke as a REIT under the Code
and the treatment of Duke OP as a partnership for federal income tax purposes.

     (e)  Other Tax Opinion.  Weeks shall have received an opinion dated as of
          -----------------                                                   
the Closing Date from King & Spalding (subject to customary exceptions,
assumptions and qualifications, and based on 

                                       43
<PAGE>
 
customary representations) to the effect that the REIT Merger will qualify as a
tax-free reorganization under Section 368(a) of the Code.

     (f)  Consents.  All consents and waivers from third parties necessary in
          --------                                                           
connection with the consummation of the transactions shall have been obtained,
other than such consents and waivers from third parties, which, if not obtained,
would not result, individually or in the aggregate, in a Weeks Material Adverse
Effect or a Duke Material Adverse Effect.

     (g)  Directors' Resignations.  If the Duke Special Charter Proposal is not
          -----------------------                                              
approved by the 80% Duke Approval at the Duke Shareholders Meeting, Duke shall
have received resignations from certain members of its Board of Directors which
are sufficient to permit the adoption of Exhibits G and H as the Charter and By-
                                         ----------     -                      
laws and the election as directors of the individuals set forth on Schedule E.

                                  ARTICLE VII

                                 BOARD ACTIONS
                                 -------------

     Section 7.1.  Board Actions.  Notwithstanding Section 5.6 or any other
                   -------------                                           
provision of this Agreement to the contrary, to the extent required by the
fiduciary obligations of the Board of Directors of either Duke or Weeks, as
determined by either such board in good faith after consultation with outside
counsel, either Duke or Weeks may:

     (a)  disclose to its shareholders any information required to be disclosed
under applicable law;

     (b)  to the extent applicable, comply with Rule 14e-2(a) promulgated under
the Exchange Act with respect to a Competing Transaction;

     (c)  in response to an unsolicited request therefor, participate in
discussions or negotiations with or furnish information with respect to it
pursuant to a confidentiality agreement which is at least as favorable to it as
the Confidentiality Agreement, or otherwise respond to or deal with any person
in connection with a Superior Competing Transaction, provided that it shall have
notified either Duke or Weeks, as the case may be, of such unsolicited requests
or its participation in discussions or negotiations in accordance with Section
5.6; and

     (d)  approve or recommend (and in connection therewith withdraw or modify
its approval or recommendation of this Agreement, the OP Merger Agreement and
the REIT Merger and the OP Merger) a Superior Competing Transaction (as defined
below) or enter into an agreement with respect to such Superior Competing
Transaction (for purposes of this Agreement, "Superior Competing Transaction"
                                              ------------------------------ 
means a bona fide proposal for a Competing Transaction made by a third party
which a majority of the members of the Board of Directors of Duke or Weeks, as
the case may be, determines in good faith (after consultation with its financial
advisor) to be more favorable to its shareholders than the REIT Merger and the
OP Merger.

     Section 7.2.  Weeks Subsidiary Boards  On the Closing Date, Weeks shall use
                   -----------------------                                      
its reasonable best efforts to cause the directors and officers of each of the
Weeks Subsidiaries to submit their resignations from such positions, effective
as of the Effective Time.

                                       44
<PAGE>
 
                                 ARTICLE VIII

                       TERMINATION, AMENDMENT AND WAIVER
                       ---------------------------------

     Section 8.1.  Termination.  This Agreement and the OP Merger Agreement may
                   -----------                                                 
be terminated at any time prior to the filing of a certificate of merger for the
OP Merger with the Secretary of State of Indiana and the Secretary of State of
Georgia, whether before or after any or all of the Stockholder Approvals are
obtained:

     (a)  by mutual written consent duly authorized by the respective Boards of
Directors of Duke and Weeks;

     (b)  by Duke, upon a breach of any representation, warranty, covenant or
agreement on the part of Weeks set forth in this Agreement, or if any
representation or warranty of Weeks shall have become untrue, in either case
such that the conditions set forth in Section 6.2(a) or Section 6.2(b), as the
case may be, would be incapable of being satisfied by December 31, 1999 (as
otherwise extended);

     (c)  by Weeks, upon a breach of any representation, warranty, covenant or
agreement on the part of Duke set forth in this Agreement, or if any
representation or warranty of Duke shall have become untrue, in either case such
that the conditions set forth in Section 6.3(a) or Section 6.3(b), as the case
may be, would be incapable of being satisfied by December 31, 1999 (as otherwise
extended);

     (d)  by either Duke or Weeks, if any judgment, injunction, order, decree or
action by any Governmental Entity of competent authority preventing the
consummation of the REIT Merger or the OP Merger shall have become final and
nonappealable;

     (e)  by either Duke or Weeks, if the REIT Merger shall not have been
consummated before December 31, 1999; provided, however, that a party that has
                                      --------  -------                       
materially breached a representation, warranty or covenant of such party set
forth in this Agreement shall not be entitled to exercise its right to terminate
under this Section 8.1(e);

     (f)  by Duke or Weeks (unless Weeks is in breach of its obligations under
Section 5.1) if, upon a vote at a duly held Weeks Shareholders Meeting or any
adjournment thereof, the Weeks Shareholder Approvals shall not have been
obtained, as contemplated by Section 5.1;

     (g)  by Weeks or Duke (unless Duke is in breach of its obligations under
Section 5.1) if, upon a vote at a duly held Duke Shareholders Meeting or any
adjournment thereof, the Duke Merger Shareholder Approval shall not have been
obtained, as contemplated by Section 5.1;

     (h)  by Weeks, prior to the Weeks Shareholders Meeting and not less than 30
days after the Board of Directors of Weeks shall have withdrawn or modified in
any manner adverse to Duke or Duke OP its approval or recommendation of the REIT
Merger, the OP Merger or this Agreement or the OP Merger Agreement in connection
with, or approved or recommended, a Superior Competing Transaction;

     (i)  by Duke, prior to the Duke Shareholders Meeting and not less than 30
days after the Board of Directors of Duke shall have withdrawn or modified in
any manner adverse to Weeks or Weeks OP its approval or recommendation of the
Merger, the OP Merger or this Agreement or the OP Merger Agreement in connection
with, or approved and recommended, a Superior Competing Transaction;

     (j)  by Duke, if (i) prior to the Weeks Shareholders Meeting the Board of
Directors of Weeks or any committee thereof shall have withdrawn or modified in
any manner adverse to Duke its approval 

                                       45
<PAGE>
 
or recommendation of the REIT Merger, the OP Merger or this Agreement or the OP
Merger Agreement in connection with, or approved or recommended, any Superior
Competing Transaction, (ii) Weeks or Weeks OP shall have entered into any
agreement with respect to any Competing Transaction, or (iii) the Board of
Directors of Weeks or any committee thereof shall have resolved to do any of the
foregoing; or

     (k)  by Weeks if (i) prior to the Duke Shareholders Meeting the Board of
Directors of Duke or any committee thereof shall have withdrawn or modified in
any manner adverse to Weeks its approval or recommendation of the REIT Merger or
the OP Merger or this Agreement or the OP Agreement in connection with, or
approved or recommended, a Superior Competing Transaction, (ii) Duke or Duke OP
shall have entered into any agreement with respect to any Competing Transaction,
or (iii) the Board of Directors of Duke or any committee thereof shall have
resolved to do any of the foregoing.

     Section 8.2.  Expenses.
                   -------- 

     (a)  Except as otherwise specified in this Section 8.2 or agreed in writing
by the parties, all out-of-pocket costs and expenses incurred in connection with
this Agreement, the REIT Merger, the OP Merger Agreement, the OP Merger and the
other transactions contemplated hereby and the OP Merger Agreement shall be paid
by the party incurring such cost or expense.

     (b)  Weeks agrees that if this Agreement shall be terminated pursuant to
Section 8.1(b) then Weeks will pay to Duke, or as directed by Duke, an amount
equal to the Duke Break-Up Expenses (as defined below).  In addition, Weeks
agrees that if (x) this Agreement shall be terminated pursuant to Section 8.1(b)
or (f) and within 12 months following such termination Weeks or Weeks OP shall
consummate a Competing Transaction or enter into a definitive agreement
providing for a Competing Transaction or (y) this Agreement is terminated
pursuant to Section 8.1(h) or (j), then Weeks will pay as directed by Duke a fee
in an amount equal to the Duke Break-Up Fee (as defined below) less any Duke
Break-Up Expenses.  Payment of any of such amounts shall be made, as directed by
Duke, by wire transfer of immediately available funds promptly, but in no event
later than two business days after the amount is due as provided herein.  The
"Duke Break-Up Fee" shall be an amount equal to the lesser of (i) $50,000,000 
 -----------------           
(the "Base Amount") or (ii) the sum of (A) the maximum amount that can be paid
      -----------                                                             
to Duke or Duke OP for the taxable year in which this Agreement is terminated
without causing Duke to fail to meet the requirements of Sections 856(c)(2) and
(3) of the Code determined as if the payment of such amount did not constitute
income described in Sections 856(c)(2) and (3) of the Code ("Qualifying
                                                             ----------
Income"), as determined by outside counsel or independent accountants to Duke,
- ------
and (B) in the event Duke receives a letter from outside counsel (the "Duke
                                                                       ----
Break-Up Fee Tax Opinion") indicating that Duke has received a ruling from the
- ------------------------                                                      
IRS holding that the receipt by Duke or Duke OP of the Base Amount would either
constitute Qualifying Income as to Duke with respect to Duke's proportionate
share thereof or would be excluded from Duke's gross income for purposes of
Sections 856(c)(2) and (3) of the Code (the "REIT Requirements"), the Base
                                             -----------------            
Amount less the amount payable under clause (A) above.  In the event that Duke
OP is not able to receive the full Base Amount, Weeks shall place the unpaid
amount in escrow and shall not release any portion thereof to Duke or Duke OP
unless and until Weeks receives any one or a combination of the following:  (i)
a letter(s) from Duke's outside counsel or independent accountants indicating
the maximum amount that can be paid at that time to Duke OP without causing Duke
to fail to meet the REIT Requirements for any relevant taxable year, together
with an IRS ruling or opinion of the counsel to the effect that such payment
would not be treated as included in the income of Weeks for any prior taxable
year, in which event such maximum amount shall be paid to Duke OP, or (ii) a
Duke Break-Up Fee Tax Opinion, in which event Weeks shall pay to Duke OP the
unpaid Base Amount.  Weeks' obligation to pay any unpaid portion of the Duke
Break-Up Fee (provided Weeks has otherwise complied with its obligations under
this provision) shall terminate (and any amount still held in such escrow shall
be released to Weeks) on the date that is five years from the date the Duke
Break-Up Fee first becomes due under this Agreement.  The "Duke Break-Up
                                                           -------------
Expenses" shall be an amount equal 
- --------                           

                                       46
<PAGE>
 
to the lesser of (i) Duke OP's out-of-pocket expenses incurred in connection
with this Agreement and the other transactions (including, without limitation,
all attorneys', accountants' and investment bankers' fees and expenses) but in
no event in an amount greater than $5,000,000 (such amount not to exceed such
$5,000,000 being referred to in this Section 8.2(b) or (c) as the "Duke Expense
                                                                   ------------
Fee Base Amount") and (ii) the sum of (A) the maximum amount that can be paid
- ---------------
to Duke OP without causing Duke to fail to meet the requirements of Sections
856(c)(2) and (3) of the Code determined as if the payment of such amount did
not constitute Qualifying Income, as determined by outside counsel or
independent accountants to Duke and (B) in the event Duke receives a Duke Break-
Up Fee Tax Opinion indicating that Duke has received a ruling from the IRS
holding that Duke OP's receipt of the Duke Expense Fee Base Amount would either
constitute Qualifying Income as to Duke with respect to Duke's proportionate
share thereof or would be excluded from Duke's gross income for purposes of the
REIT Requirements, the Duke Expense Fee Base Amount less the amount payable
under clause (A) above. In the event that Duke is not able to receive the full
amount of the Duke Break-Up Expenses, Weeks shall place the unpaid amount in
escrow and shall not release any portion thereof to Duke OP unless and until
Weeks receives any one or combination of the following: (i) a letter(s) from
Duke's outside counsel or independent accountants indicating the maximum amount
that can be paid at that time to Duke OP without causing Duke to fail to meet
the REIT Requirements for any relevant taxable year together with an IRS ruling
or opinion of tax counsel to the effect that such payment would not be treated
as included in income for any prior taxable year, in which event such maximum
amount shall be paid to Duke OP, or (ii) a Duke Break-Up Fee Tax Opinion
indicating that Duke's receipt of the Expense Fee Base Amount would satisfy in
whole or in part the REIT Requirements, in which event Weeks shall pay to Duke
OP the unpaid Duke Expense Fee Base Amount. Weeks' obligation to pay any unpaid
portion of the Duke Break-Up Expenses (provided Weeks has otherwise complied
with its obligations under this provision) shall terminate (and any amount still
held in such escrow shall be released to Weeks) on the date that is five years
from the date the Duke Break-Up Expenses first become due under this Agreement.

     (c)  Duke agrees that if this Agreement shall be terminated pursuant to
Section 8.1(c), then Duke will pay, as directed by Weeks, an amount equal to the
Weeks Break-Up Expenses (as defined below).  In addition, Duke and Duke OP agree
that if (x) this Agreement shall be terminated pursuant to Section 8.1(c) or (g)
and within 12 months following such termination Duke or Duke OP shall consummate
a Competing Transaction or enter into a definitive agreement providing for a
Competing Transaction or (y) this Agreement is terminated pursuant to Section
8.1(i) or (k), then Duke or Duke OP will pay as directed by Weeks a fee in an
amount equal to the Weeks Break-Up Fee (as defined below) less any Weeks Break-
Up Expenses.  Payment of any of such amounts shall be made, as directed by
Weeks, by wire transfer of immediately available funds promptly, but in no event
later than two business days after the amount is due as provided herein.  The
"Weeks Break-Up Fee" shall be an amount equal to the lesser of (i) $50,000,000
 ------------------                                                           
(the "Base Amount") and (ii) the sum of (A) the maximum amount that can be paid
      -----------                                                              
to Weeks without causing it to fail to meet the requirements of Sections
856(c)(2) and (3) of the Code determined as if the payment of such amount did
not constitute Qualifying Income, as determined by independent accountants to
Weeks and (B) in the event Weeks receives a letter from outside counsel (the
"Weeks Break-Up Fee Tax Opinion") indicating that Weeks has received a ruling
 ------------------------------                                              
from the IRS holding that Weeks' receipt of the Base Amount would either
constitute Qualifying Income or would be excluded from gross income for purposes
of Sections 856(c)(2) and (3) of the Code, the Base Amount less the amount
payable under clause (A) above.  In the event that Weeks is not able to receive
the full Base Amount, Duke shall place the unpaid amount in escrow and shall not
release any portion thereof to Weeks unless and until Duke receives any one or a
combination of the following:  (i) a letter(s) from Weeks' outside counsel or
independent accountants indicating the maximum amount that can be paid at that
time to Weeks without causing Weeks to fail to meet the REIT Requirements for
any relevant taxable year together with an IRS ruling or opinion of tax counsel
to the effect that such payment would not be treated as included in income for
any prior taxable year, in which even such maximum amount shall be paid to Weeks
OP, or (ii) a Weeks Break-Up Fee Tax Opinion, in which event Duke shall pay to
Weeks the 

                                       47
<PAGE>
 
unpaid Base Amount. Duke's obligation to pay the Weeks Break-Up Fee (provided
Duke has otherwise complied with its obligations under this provision) shall
terminate (and any amount still held in such escrow shall be released to Duke)
on the date that is five years from the date the Weeks Break-Up Fee first
becomes due under this Agreement. The "Weeks Break-Up Expenses" shall be an
                                       -----------------------             
amount equal to the lesser of (i) Weeks' out-of-pocket expenses incurred in
connection with this Agreement and the other transactions (including, without
limitation, all attorneys', accountants' and investment bankers' fees and
expenses) but in no event in an amount greater than $5,000,000 (such amount not
to exceed such $5,000,000 being referred to in this Section 8.2(d) or (e) as the
"Weeks Expense Fee Base Amount") and (ii) the sum of (A) the maximum amount that
 -----------------------------                                                  
can be paid to Weeks without causing it to fail to meet the requirements of
Sections 856(c)(2) and (3) of the Code determined as if the payment of such
amount did not constitute Qualifying Income, as determined by independent
accountants to Weeks and (B) in the event Weeks receives a Weeks Break-Up Fee
Tax Opinion indicating that Weeks has received a ruling from the IRS holding
that Weeks' receipt of the Weeks Expense Fee Base Amount would either constitute
Qualifying Income or would be excluded from gross income for purposes of the
REIT Requirements or that receipt by Weeks of the remaining balance of the Weeks
Expense Fee Base Amount following the receipt of and pursuant to such ruling
would not be deemed constructively received prior thereto, the Expense Fee Base
Amount less the amount payable under clause (A) above.  In the event that Weeks
is not able to receive the full Weeks Expense Fee Base Amount, Duke and Duke OP
shall place the unpaid amount in escrow and shall not release any portion
thereof to Weeks OP unless and until Duke receives any one or combination of the
following:  (i) a letter(s) from Weeks' outside counsel or independent
accountants indicating the maximum amount that can be paid at that time to Weeks
OP without causing Weeks to fail to meet the REIT Requirements for any relevant
taxable year together with an IRS ruling or opinion of tax counsel to the effect
that such payment would not be treated as included in income for any prior
taxable year, in which event such maximum amount shall be paid to Weeks OP, or
(ii) a Weeks Break-Up Fee Tax Opinion indicating that Weeks' receipt of the
Weeks Expense Fee Base Amount would satisfy in whole or in part the REIT
Requirements, in which event Duke shall pay to Weeks OP the lessor of the unpaid
Weeks Expense Fee Base Amount.  Duke's obligation to pay any unpaid portion of
the Weeks Break-Up Expenses (provided Duke has otherwise complied with its
obligations under this provision) shall terminate (and any amount still held in
such escrow shall be released to Duke) on the date that is five years from the
date the Weeks Break-Up Expenses first become due under this Agreement.

     (d)  In the event that any of Duke or Weeks is required to file suit to
seek all or a portion of the amounts payable under this Section 8.2, and such
party prevails in such litigation, such party shall be entitled to all expenses,
including attorney's fees and expenses which it has incurred in enforcing its
rights hereunder; provided that such expenses shall be considered part of out-
                  --------                                                   
of-pocket expenses incurred in connection with this Agreement and the other
transactions within the definition of Duke Break-Up Expenses or Weeks Break-Up
Expenses, as the case may be.

     Section 8.3.  Effect of Termination.  In the event of termination of this
                   ---------------------                                      
Agreement by either Weeks or Duke as provided in Section 8.1, this Agreement
shall forthwith become void and have no effect, without any liability or
obligation on the part of Duke, or Weeks, other than the last sentence of
Section 5.2, Section 8.2, this Section 8.3 and Article IX and except to the
extent that such termination results from a willful breach by a party of any of
its representations, warranties, covenants or agreements set forth in this
Agreement.

     Section 8.4.  Amendment.  This Agreement may be amended by the parties in
                   ---------                                                  
writing by action of their respective Boards of Directors at any time before or
after any Stockholder Approvals, the Weeks OP Approvals and the Duke OP
Approvals are obtained and prior to the filing of the Articles of Merger for the
Merger with the Secretary of State of Indiana and the Secretary of State of
Georgia and a certificate of merger for the OP Merger with the Office of the
Secretary of State of Indiana and the Office of the Secretary of State of
Georgia; provided, however, that, after any of the Stockholder Approvals, the
         --------  -------                                                   

                                       48
<PAGE>
 
Weeks OP Approvals and the Duke OP Approvals are obtained, no such amendment,
modification or supplement shall alter the amount or change the form of the
consideration to be delivered to Weeks' or Duke's shareholders or alter or
change any of the terms or conditions of this Agreement if such alteration or
change would adversely affect Weeks' shareholders or Duke's shareholders, or the
Weeks Limited Partners or Duke Limited Partners.

     Section 8.5.  Extension; Waiver.  At any time prior to the Effective Time,
                   -----------------                                           
each of Weeks and Duke may (a) extend the time for the performance of any of the
obligations or other acts of the other party, (b) waive any inaccuracies in the
representations and warranties of the other party contained in this Agreement or
in any document delivered pursuant to this Agreement or (c) subject to the
proviso of Section 8.4, waive compliance with any of the agreements or
conditions of the other party contained in this Agreement.  Any agreement on the
part of a party to any such extension or waiver shall be valid only if set forth
in an instrument in writing signed on behalf of such party.  Any waivers
pursuant to clause (c) of the second preceding sentence (i) of the provisions of
Section 4.1(e) may be given in writing by or on behalf of Duke by the chief
executive officer of Duke and (ii) of the provisions of Section 4.2(e) may be
given in writing by or on behalf of Weeks by the chief executive officer of
Weeks.  The failure of any party to this Agreement to assert any of its rights
under this Agreement or otherwise shall not constitute a waiver of those rights.

                                  ARTICLE IX

                              GENERAL PROVISIONS
                              ------------------

     Section 9.1.  Nonsurvival of Representations and Warranties.  None of the
                   ---------------------------------------------              
representations and warranties in this Agreement or in any instrument delivered
pursuant to this Agreement shall survive the Effective Time.  This Section 9.1
shall not limit any covenant or agreement of the parties which by its terms
contemplates performance after the Effective Time.

     Section 9.2.  Notices.  All notices, requests, claims, demands and other
                   -------                                                   
communications under this Agreement shall be in writing and shall be deemed
given if delivered personally, sent by overnight courier (providing proof of
delivery) to the parties or sent by telecopy (providing confirmation of
transmission) at the following addresses or telecopy numbers (or at such other
address or telecopy number for a party as shall be specified by like notice):

     (a)  if to Duke, to

          Darell E. Zink, Jr.
          Executive Vice President and Chief Financial Officer
          8888 Keystone Crossing
          Suite 1150
          Indianapolis, Indiana 46240

          with a copy to:

          John R. Gaskin
          Vice President and General Counsel
          8888 Keystone Crossing
          Suite 1150
          Indianapolis, Indiana 46240

                                       49
<PAGE>
 
          and a copy to:

          Rogers & Wells LLP
          200 Park Avenue
          New York, NY  10166
          Attn:  Robert E. King, Jr.
          Fax:   (212) 878-8375

     (b)  if to Weeks, to

          A. Ray Weeks, Jr.
          Chairman and Chief Executive Officer
          4497 Park Drive
          Norcross, Georgia 30093

          with a copy to:

          Elizabeth C. Belden
          General Counsel
          4497 Park Drive
          Norcross, Georgia 30093

          and a copy to:

          William B. Fryer
          King & Spalding
          191 Peachtree Street
          Atlanta, GA 30303
          Fax:   (404) 572-5148
 
     Section 9.3.  Interpretation.  When a reference is made in this Agreement
                   --------------                                             
to a Section, such reference shall be to a Section of this Agreement unless
otherwise indicated.  The table of contents and headings contained in this
Agreement are for reference purposes only and shall not affect in any way the
meaning or interpretation of this Agreement.  Whenever the words "include,"
"includes" or "including" are used in this Agreement, they shall be deemed to be
followed by the words "without limitation."

     Section 9.4.  Counterparts.  This Agreement may be executed in one or more
                   ------------                                                
counterparts, all of which shall be considered one and the same agreement and
shall become effective when one or more counterparts have been signed by each of
the parties and delivered to the other parties.

     Section 9.5.  Entire Agreement; No Third-Party Beneficiaries. This
                   ----------------------------------------------      
Agreement, the Confidentiality Agreement and the other agreements entered into
in connection with the transactions (a) constitute the entire agreement and
supersedes all prior agreements and understandings, both written and oral,
between the parties with respect to the subject matter of this Agreement and,
(b) except for the provisions of Article II and Sections 5.11(b) and 5.12, are
not intended to confer upon any person other than the parties hereto any rights
or remedies.

     Section 9.6.  GOVERNING LAW.  THIS AGREEMENT SHALL BE GOVERNED BY, AND
                   -------------                                           
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF INDIANA.

                                       50

<PAGE>
 
     Section 9.7.  Assignment.  Neither this Agreement nor any of the rights,
                   ----------                                                
interests or obligations under this Agreement shall be assigned or delegated, in
whole or in part, by operation of law or otherwise by any of the parties without
the prior written consent of the other parties.  Subject to the preceding
sentence, this Agreement will be binding upon, inure to the benefit of, and be
enforceable by, the parties and their respective successors and assigns.

     Section 9.8.  Enforcement.  The parties agree that irreparable damage would
                   -----------                                                  
occur in the event that any of the provisions of this Agreement were not
performed in accordance with their specific terms or were otherwise breached.
It is accordingly agreed that the parties shall be entitled to an injunction or
injunctions to prevent breaches of this Agreement and to enforce specifically
the terms and provisions of this Agreement in any court of the United States
located in the State of Indiana or in any Indiana State court, this being in
addition to any other remedy to which they are entitled at law or in equity.  In
addition, each of the parties hereto (a) consents to submit itself (without
making such submission exclusive) to the personal jurisdiction of any federal
court located in the State of Indiana or any Indiana State court in the event
any dispute arises out of this Agreement or any of the transactions contemplated
by this Agreement and (b) agrees that it will not attempt to deny or defeat such
personal jurisdiction by motion or other request for leave from any such court.

     Section 9.9.  Exhibits; Disclosure Letters.  All Exhibits referred to
                   ----------------------------                           
herein and in the Weeks Disclosure Letter and the Duke Disclosure Letter are
intended to be and hereby are specifically made a part of this Agreement.  Each
exception to a representation or warranty of Duke or Weeks that is set forth in
the applicable Duke or Weeks Disclosure Letter is identified by reference to, or
has been grouped under a heading referring to, a specific individual Section of
this Agreement and, except as otherwise specifically stated with respect to such
exception in the applicable Duke or Weeks Disclosure Letter, relates only to
such Section.

                                   ARTICLE X

                              CERTAIN DEFINITIONS
                              -------------------

     Section 10.1.  Certain Definitions.  For purposes of this Agreement:
                    -------------------                                  

     An "affiliate" of any person means another person that directly or
         ---------                                                     
indirectly, through one or more intermediaries, controls, is controlled by, or
is under common control with, such first person.

     "Employee Plan" means any employment, bonus, incentive compensation,
      -------------                                                      
deferred compensation, pension, profit sharing, retirement, stock purchase,
stock option, stock ownership, stock appreciation rights, phantom stock, equity
(or equity-based) leave of absence, layoff, vacation, day or dependent care,
legal services, cafeteria, life, health, medical, accident, disability,
workmen's compensation or other insurance, severance, separation, termination,
change of control or other benefit plan, agreement (including any collective
bargaining agreement), practice, policy or arrangement of any kind, whether
written or oral, and whether or not subject to ERISA, including, but not limited
to, any "employee benefit plan" within the meaning of Section 3(3) of ERISA.

     "Knowledge" where used herein with respect to Weeks shall mean the
      ---------                                                        
knowledge of the persons named in Section 10 of the Weeks Disclosure Letter and
where used with respect to Duke shall mean the knowledge of the persons named in
Section 10 of the Duke Disclosure Letter.

     "Law" means any statute, law, regulation or ordinance of any Government
      ---                                                                   
Entity applicable to Duke or Weeks or any of their respective Subsidiaries.

                                       51
<PAGE>
 
     "Duke Subsidiary" means the Duke OP and each other Subsidiary of Duke.
      ---------------                                                      

     "Person" means an individual, corporation, partnership, limited liability
      ------                                                                  
company, joint venture, association, trust, unincorporated organization or other
entity.

     "Subsidiary" of any person means any corporation, partnership, limited
      ----------                                                           
liability company, joint venture or other legal entity of which such person
(either directly or through or together with another Subsidiary of such person)
owns 50% or more of the voting stock, value of  or other equity interests
(voting or non-voting) of such corporation, partnership, limited liability
company, joint venture or other legal entity.

     "Weeks Subsidiary" means Weeks OP and each other Subsidiary of Weeks.
      ----------------                                                    

                                       52
<PAGE>
 
     IN WITNESS WHEREOF, Duke and Weeks have caused this Agreement to be signed
by their respective officers thereunto duly authorized, all as of the date first
written above.

                              DUKE REALTY INVESTMENTS, INC.

                              By:__________________________________________
                                 Name:
                                 Title:

                              WEEKS CORPORATION

                              By:__________________________________________
                                 Name:
                                 Title:

                                       53

<PAGE>
 
                                                                  EXHIBIT 10.2

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


                          AGREEMENT AND PLAN OF MERGER

                         Dated as of February 28, 1999

                                  by and among

                        DUKE REALTY LIMITED PARTNERSHIP

                                      and

                               WEEKS REALTY, L.P.


    -----------------------------------------------------------------------
<PAGE>
 
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                   Page
<S>                    <C>                                                         <C>
ARTICLE I     THE MERGER.........................................................    1
     Section 1.1   The Merger....................................................    1
     Section 1.3   Effective Time................................................    2
     Section 1.4   Agreement of Limited Partnership..............................    2
     Section 1.5   Partnership Approvals.........................................    2
ARTICLE II    EFFECTS OF THE MERGER..............................................    3
     Section 2.1   Effect on Partner Interests...................................    3
             (a)   OP Units......................................................    3
             (b)   Exchange, Registration Rights.................................    3
ARTICLE III   CONDITIONS PRECEDENT...............................................    3
     Section 3.1   Conditions to Each Party's Obligation to Effect the OP Merger.    3
ARTICLE IV    TERMINATION, AMENDMENT AND WAIVER..................................    4
     Section 4.1   Termination...................................................    4
     Section 4.2   Effect of Termination.........................................    4
     Section 4.3   Amendment.....................................................    4
     Section 4.4   Extension; Waiver.............................................    4
ARTICLE V     GENERAL PROVISIONS.................................................    4
     Section 5.1   Notices.......................................................    4
     Section 5.2   Interpretation................................................    5
     Section 5.3   Counterparts..................................................    5
     Section 5.4   Entire Agreement; No Third-Party Beneficiaries................    5
     Section 5.5   GOVERNING LAW.................................................    5
     Section 5.6   Assignment....................................................    5
     Section 5.7   Enforcement...................................................    5
</TABLE>
                

                                      -i-
<PAGE>
 
     AGREEMENT AND PLAN OF MERGER (the "Agreement"), dated as of February 28,
                                        ---------                            
1999, by and among DUKE REALTY LIMITED PARTNERSHIP, an Indiana Limited
Partnership ("Duke OP") and WEEKS REALTY, L.P., a Georgia  Limited Partnership
              -------                                                         
("Weeks OP").
  --------   

                                    RECITALS

     A.  Duke Realty Investments, Inc., as the managing general partner of Duke
OP, and Weeks Corporation (through its wholly owned subsidiary), as the general
partner of Weeks OP each has determined that it is advisable and in the best
interest of their respective partnerships and partners that upon the terms and
subject to the conditions set forth in this Agreement, Weeks OP will merge with
and into Duke OP with Duke OP being the surviving partnership in such merger
(the "OP Merger") and: (i) each issued and outstanding common unit of limited
      ---------                                                              
partnership interest in Weeks OP (the "Weeks Common Units"), (ii) each issued
                                       ------------------                    
and outstanding 8.0% Series A Cumulative Redeemable Preferred Partnership Unit
in Weeks OP (the "Weeks Series A Preferred Units"), (iii) each issued and
                  ------------------------------                         
outstanding 8.0% Series C Cumulative Redeemable Preferred Partnership Unit in
Weeks OP (the "Weeks Series C Preferred Units"), and (iv) each issued and
               ------------------------------                            
outstanding 8.625% Series D Cumulative Redeemable Preferred Partnership Unit in
Weeks OP (the "Weeks Series D Preferred Units" and, collectively, with the Weeks
               ------------------------------                                   
Common Units, the Weeks Series A Preferred Units and the Weeks Series C
Preferred Units, the "Weeks OP Units") will be converted into the right to
                      --------------                                      
receive the OP Merger Consideration (as defined herein).

     B.  The Boards of Directors of Duke Realty Investments, Inc., an Indiana
corporation ("Duke") and Weeks Corporation, a Georgia Corporation, ("Weeks")
              ----                                                   -----  
each have determined that it is advisable and in the best interest of their
respective companies and stockholders that upon the terms and subject to the
conditions set forth in an agreement and plan of merger between Duke and Weeks
executed on the date hereof and substantially in the form of Exhibit A hereto
(the "REIT Merger Agreement"), Weeks will merge with and into Duke with Duke
      ---------------------                                                 
being the surviving corporation in such merger (the "REIT Merger") and each
                                                     -----------           
issued and outstanding share of common stock, par value $.01 per share, of Weeks
(the "Weeks Common Stock"), each issued and outstanding share of 8.0% Series A
      ------------------                                                      
Cumulative Redeemable Preferred Stock, par value $.01 per share, of Weeks (the
                                                                              
"Weeks Series A Preferred Stock") and each issued and outstanding share, if any,
- -------------------------------                                                 
of 8.625% Series D Cumulative Redeemable Preferred Stock, par value $.01 per
share, of Weeks (the "Weeks Series D Preferred Stock"), will be converted into
                      ------------------------------                          
the right to receive the applicable Merger Consideration (as defined in the REIT
Merger Agreement);

     In consideration of the representations, warranties, covenants and
agreements contained in this Agreement, the parties agree as follows:
<PAGE>
 
                                   ARTICLE I

                                   THE MERGER

     Section 1.1.  The Merger.
                   ---------- 
     (a)  Upon the terms and subject to the conditions set forth in this
Agreement, at the Effective Time (as hereinafter defined), Weeks OP shall be
merged with and into Duke OP in accordance with the Indiana Revised Uniform
Limited Partnership Act (the "IRULPA") and the Georgia Revised Uniform
                              ------                                  
Limited Partnership Act (the "GRULPA," and together with the IRULPA, the
                              ------                         ------     
"Governing Laws"), whereupon the separate corporate existence of Weeks OP
- ---------------                                                          
shall cease and Duke OP shall continue as the surviving limited partnership
(the "Surviving OP").
      ------------
   
     (b)  The OP Merger shall have the effects set forth in the Governing Laws.
Accordingly, from and after the Effective Time, the Surviving OP shall possess
all the rights, privileges, powers and franchises and be subject to all of the
restrictions, disabilities, liabilities and duties of Duke OP and Weeks OP.

     Section 1.2.  Closing.  The closing of the transactions contemplated by
                   -------
this Agreement (the "Closing") will take place at 10:00 a.m. New York City time
                     -------
on the second business day after satisfaction or waiver of the conditions set
forth in Article III (the "Closing Date"), at the offices of Rogers & Wells LLP,
                           ------------
200 Park Avenue, New York, New York 10166, unless another date or place is
agreed to in writing by the parties.

      Section 1.3. Effective Time. On the Closing Date, the parties shall
                   --------------
execute and file a Certificate of Merger in accordance with GRULPA and an
Articles of Merger in accordance with IRULPA and shall make all other filings or
recordings required with respect to the OP Merger under the Governing Laws. The
OP Merger shall become effective at such time as the Certificate of Merger and
Articles of Merger for the OP Merger have been duly filed with the Secretary of
State of Georgia and the Secretary of State of Indiana, respectively, or at such
other time or times as may be agreed by Duke OP and Weeks OP and specified in
the Certificate of Merger and Articles of Merger (the time the OP Merger becomes
effective being the "Effective Time"), it being understood that the parties
                     --------------
shall cause the Effective Time to occur on the Closing Date.

     Section 1.4.  Agreement of Limited Partnership.  The second amended and
                   --------------------------------
restated agreement of limited partnership of Duke OP, as amended in accordance
with Section 5.17 of the REIT Merger Agreement, shall become the agreement of
limited partnership (the "Duke OP Agreement") of the Surviving OP upon the
                          -----------------
occurrence of the Effective Time until further amended in accordance with
applicable Indiana law.

     Section 1.5.  Partnership Approvals
                   ---------------------

     (a)  Weeks OP represents and warrants to Duke OP that as of the date of
this Agreement it has obtained all the written consents of the holders of Weeks
OP Units required to approve the OP Merger and this Agreement and the
transactions contemplated by this Agreement (the "Weeks OP Approvals").
                                                  ------------------   

                                       2
<PAGE>
 
     (b)  Duke OP represents and warrants to Weeks OP that as of the date of
this Agreement it has obtained all the written consents of the holders of Duke
OP Units required to approve the OP Merger and this Agreement and the
transactions contemplated by this Agreement (the "Duke OP Approvals").
                                                  -----------------   

                                  ARTICLE II

                             EFFECTS OF THE MERGER
                             ---------------------

     Section 2.1.  Effect on Partner Interests.
                   --------------------------- 

     (a)  OP Units.  At the effective time of the OP Merger:  (i) each issued
          --------
and outstanding Weeks Common Unit shall be converted, by virtue of the OP
Merger, automatically and without any action on the part of any holder thereof,
into 1.38 common units of limited partnership interest in Duke OP (the "Duke
                                                                        ----
Common Units"); (ii) each issued and outstanding Weeks Series A Preferred Unit
- ------------
shall be converted, by virtue of the OP Merger, automatically and without any
action on the part of any holder thereof, into 1/1000 of one 8.0% Series F
Cumulative Redeemable Preferred Units in Duke OP (the "Duke Series F Preferred
                                                       -----------------------
Units"), (iii) each issued and outstanding Weeks Series C Preferred Unit shall
- -----
be converted, by virtue of the OP Merger, automatically and without any action
on the part of any holder thereof, into 1/1000 of one 8.0 % Series G Cumulative
Redeemable Preferred Units in Duke OP (the "Duke Series G Preferred Units"), and
                                            -----------------------------
(iv) each issued and outstanding Weeks Series D Preferred Unit shall be
converted, by virtue of the OP Merger, automatically and without any action on
the part of any holder thereof, into 1/1000 of one 8.625% Series H Cumulative
Redeemable Preferred Units in Duke OP (the "Duke Series H Preferred Units" and,
                                            -----------------------------
collectively, with the Duke Common Units, the Duke Series F Preferred Units, and
the Duke Series G Preferred Units, the "Duke OP Units") (the "OP Merger
                                        -------------         ---------
Consideration") and all Weeks OP Units shall cease to be outstanding and shall
- -------------
automatically be cancelled and retired and all rights with respect thereto shall
cease to exist.

     (b)  Exchange, Registration Rights.  Prior to and at the Effective Time
          -----------------------------
Duke OP and Weeks OP shall take such actions (and shall cause Duke and Weeks to
take such actions) as may be required so that:

          (i)  The exchange rights granted to the limited partners of Weeks OP
pursuant to the terms and conditions set forth in the Second Amended and
Restated Agreement of Limited Partnership of Weeks OP, dated as of October 30,
1996, as amended, and all obligations thereunder shall be assumed by Duke OP as
of such Effective Time (it being understood that following such effective time,
the holders of Duke OP Units that were converted in the OP Merger from Weeks OP
Units will have the right to require Duke OP to redeem their converted units for
cash or common stock in Duke at the election of the General Partner of Duke OP);
and

          (ii) the Registration Rights Agreements currently in effect, among
Weeks, Weeks OP and the holders of Weeks OP Units and the obligations thereunder
shall be assumed by Duke as of such Effective Time.

                                       3
<PAGE>
 
                                  ARTICLE III

                              CONDITIONS PRECEDENT
                              --------------------

     Section 3.1. Conditions to Each Party's Obligation to Effect the OP Merger.
                  -------------------------------------------------------------
The respective obligations of Weeks OP and Duke OP to effect the OP Merger and
to consummate the other transactions contemplated by this Agreement to occur on
the Closing Date is subject to the satisfaction or waiver on or prior to the
Effective Time of the conditions (other than the consummation of the OP Merger)
and the performance of all the obligations by Weeks and Duke required pursuant
to the REIT Merger Agreement in order to effect the REIT Merger and the other
transactions contemplated thereunder.

                                  ARTICLE IV

                       TERMINATION, AMENDMENT AND WAIVER

     Section 4.1.  Termination.  This Agreement may not be terminated at any
                   -----------
time, provided that notwithstanding anything to the contrary contained herein,
this Agreement shall terminate immediately upon termination of the REIT Merger
Agreement.

     Section 4.2.  Effect of Termination.  In the event of termination of this
                   ---------------------
Agreement as provided in Section 4.1, this Agreement shall forthwith become void
and have no effect, without any liability or obligation on the part of Duke OP
or Weeks OP.

     Section 4.3.  Amendment.  This Agreement may be amended by the parties in
                   ---------                                                  
writing by action of their respective general partners at any time.

     Section 4.4.  Extension; Waiver.  At any time prior to the Effective Time,
                   -----------------
each of Weeks OP and Duke OP may (a) extend the time for the performance of any
of the obligations or other acts of the other party or (b) waive compliance with
any of the agreements or conditions of the other party contained in this
Agreement. Any agreement on the part of a party to any such extension or waiver
shall be valid only if set forth in an instrument in writing signed on behalf of
such party. The failure of any party to this Agreement to assert any of its
rights under this Agreement or otherwise shall not constitute a waiver of those
rights.

                                   ARTICLE V

                               GENERAL PROVISIONS
                               ------------------

     Section 5.1.  Notices.  All notices, requests, claims, demands and other
                   -------                                                   
communications under this Agreement shall be in writing and shall be deemed
given if delivered personally, sent by overnight courier (providing proof of
delivery) to the parties or sent by telecopy (providing confirmation of
transmission) at the following addresses or telecopy numbers (or at such other
address or telecopy number for a party as shall be specified by like notice):

     (a)  if to Duke OP, to

          Duke Realty Investments, Inc.

                                       4
<PAGE>
 
          8888 Keystone Crossing Ste 1200
          Indianapolis, IN 46240
          Attn:  Darell E. Zink, Jr.
          Fax:   (317) 808 6794

          with a copy to:

          Duke Realty Investments, Inc.
          8888 Keystone Crossing Ste 1200
          Indianapolis, IN 46240
          Attn: John R. Gaskin
          Fax:  (317) 808 6790
 
          and with a copy to:
 
          Rogers & Wells LLP
          200 Park Avenue
          New York, NY  10166
          Attn: Robert E. King, Jr., Esq.
          Fax:  (212) 878-8375

     (b)  if to Weeks OP, to
          
          Weeks Corporation
          4497 Park Drive
          Norcross
          Georgia 30093
          Attn: A. Ray Weeks, Jr.
          Fax:  (770) 717 3310

          with a copy to:

          Weeks Corporation
          4497 Park Drive
          Norcross
          Georgia 30093
          Attn: Elizabeth C. Belden
          Fax:  (770)717 3310

     Section 5.2.  Interpretation.  When a reference is made in this Agreement
                   --------------
to a Section, such reference shall be to a Section of this Agreement unless
otherwise indicated. The table of contents and headings contained in this
Agreement are for reference purposes only and shall not affect in any way the
meaning or interpretation of this Agreement. Whenever the words "include,"
"includes" or "including" are used in this Agreement, they shall be deemed to be
followed by the words "without limitation."

                                       5
<PAGE>
 
     Section 5.3.  Counterparts.  This Agreement may be executed in one or more
                   ------------
counterparts, all of which shall be considered one and the same agreement and
shall become effective when one or more counterparts have been signed by each of
the parties and delivered to the other parties.

     Section 5.4.  Entire Agreement; No Third-Party Beneficiaries.  This
                   ----------------------------------------------
Agreement, and the other agreements entered into in connection with the
transactions (a) constitute the entire agreement and supersedes all prior
agreements and understandings, both written and oral, between the parties with
respect to the subject matter of this Agreement and are not intended to confer
upon any person other than the parties hereto any rights or remedies.

     Section 5.5.  GOVERNING LAW.  THIS AGREEMENT SHALL BE GOVERNED BY, AND
                   -------------
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF INDIANA , REGARDLESS OF
THE LAWS THAT MIGHT OTHERWISE GOVERN UNDER APPLICABLE PRINCIPLES OF CONFLICT OF
LAWS THEREOF.

     Section 5.6.  Assignment.  Neither this Agreement nor any of the rights,
                   ----------                                                
interests or obligations under this Agreement shall be assigned or delegated, in
whole or in part, by operation of law or otherwise by any of the parties without
the prior written consent of the other parties.  Subject to the preceding
sentence, this Agreement will be binding upon, inure to the benefit of, and be
enforceable by, the parties and their respective successors and assigns.

     Section 5.7.  Enforcement.  The parties agree that irreparable damage would
                   -----------
occur in the event that any of the provisions of this Agreement were not
performed in accordance with their specific terms or were otherwise breached.
It is accordingly agreed that the parties shall be entitled to an injunction or
injunctions to prevent breaches of this Agreement and to enforce specifically
the terms and provisions of this Agreement in any court of the United States
located in the State of Indiana or in any Indiana State court, this being in
addition to any other remedy to which they are entitled at law or in equity.  In
addition, each of the parties hereto (a) consents to submit itself (without
making such submission exclusive) to the personal jurisdiction of any federal
court located in the State of Indiana or any Indiana State court in the event
any dispute arises out of this Agreement or any of the transactions contemplated
by this Agreement and (b) agrees that it will not attempt to deny or defeat such
personal jurisdiction by motion or other request for leave from any such court.

                                       6
<PAGE>
 
     IN WITNESS WHEREOF, Duke OP and Weeks OP have caused this Agreement to be
signed by their respective officers thereunto duly authorized, all as of the
date first written above.

                              DUKE REALTY LIMITED PARTNERSHIP

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

                              WEEKS REALTY, L.P.

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

                                       7

<PAGE>
 

                                                                   EXHIBIT 10.3

                                                                       EXHIBIT C

                        AGREEMENT AND IRREVOCABLE PROXY

          AGREEMENT and IRREVOCABLE PROXY (the "Agreement"), dated as of
                                                ---------               
February 28, 1999, by and among the undersigned shareholders of Duke Realty
Investments, Inc. (the "Duke Stockholders"), the undersigned principal holders
                        -----------------                                     
of units of limited partner interest in Duke Realty Limited Partnership (the
                                                                            
"Duke OP Unitholders"), and Weeks Corporation, a Georgia corporation ("Weeks").
- --------------------                                                   -----   

          A.  The Duke Stockholders are the owners, beneficially or of record,
of certain shares of common stock, par value $0.01 per share (all such shares,
the "Duke Shares"), of Duke Realty Investments, Inc., an Indiana corporation
     -----------                                                            
("Duke");
- ------   

          B.  The Duke OP Unitholders are the owners, beneficially or of record,
of certain units of limited partner interest (all such units, the "Duke OP
                                                                   -------
Units"), of Duke Realty Limited Partnership, an Indiana limited partnership
- -----                                                                           
("Duke OP");
- ---------   

          C.  Simultaneously with the execution and delivery of this Agreement,
Duke and Weeks are entering into an Agreement and Plan of Merger (the "REIT
                                                                       ----
Merger Agreement") pursuant to which Weeks will merge with and into Duke and
- ----------------                                                            
Duke OP and Weeks, L.P., a Georgia limited partnership ("Weeks OP") are entering
                                                         --------               
into an Agreement and Plan of Merger (the "OP Merger Agreement" and together
                                           -------------------              
with the REIT Merger Agreement, the "Merger Agreements") pursuant to which Weeks
                                     -----------------                          
OP will merge with and into Duke OP (the "OP Merger");
                                          ---------   

          D.  As a condition to the willingness of Weeks, and Weeks OP to enter
into the Merger Agreements, and in order to induce Weeks and Weeks OP to enter
into the Merger Agreements, the Duke Stockholders and the Duke OP Unitholders
have agreed to enter into this Agreement.

          In consideration of the promises and mutual covenants provided herein,
and other good and sufficient consideration, the receipt of which is
acknowledged by each party hereto, the parties hereto agree as follows:

          1.  Proxy.

              (a)  Each of the Duke Stockholders and Duke OP Unitholders hereby
irrevocably constitute and appoint Weeks as their true and lawful proxy and
attorney-in-fact, for and in the name, place and stead of each of the Duke
Stockholders and Duke OP Unitholders, solely to vote or cause to be voted all of
the Duke Shares and the Duke OP Units, together with any additional shares of
Duke common stock and units of limited partner interest in Duke OP that such
Duke Stockholders and Duke OP Unitholders shall acquire, between the date of
this Agreement and the date of termination of this Agreement (i) in favor of the
Merger Agreements, the REIT Merger and the OP Merger, respectively, and any
other actions and transactions contemplated in connection therewith and (ii)
against any Competing Transaction (as defined in the Merger Agreements), in each
case, at any annual, special or other meeting of the
<PAGE>
 
stockholders of Duke and/or the limited partners of Duke OP, as the case may be,
and at any adjournment or postponements thereof (each, a "Meeting"), or pursuant
                                                          -------
to any written consent in lieu of a meeting or otherwise.
                                                                        
     
              (b)  In the event that Weeks is unable or declines to exercise the
power and authority granted by the Proxy for any reason, each of the Duke
Stockholders and the Duke OP Unitholders covenant and agree to vote or cause to
be voted all of the Duke Shares in favor of approval and adoption of the Merger
Agreements and the REIT Merger, and the Duke OP Units in favor of the Merger
Agreements and the OP Merger, and any other actions and transactions
contemplated in connection therewith at any Meeting and, upon request of Weeks,
to provide their written consent thereto.

              (c)  The Duke Stockholders hereby covenant and agree that they
will not vote, cause to be voted or take any action by written consent of
stockholders in lieu of a meeting on any matter which is subject to the Proxy
without the prior written consent of Weeks, and will promptly provide Weeks with
copies of any stockholder notices given by Duke and received by the Duke
Stockholders.

              (d)  The Duke OP Unitholders hereby covenant and agree that they
will not vote, cause to be voted or take any action by written consent of
limited partners of Duke OP in lieu of a meeting on any matter which is subject
to the Proxy without the prior written consent of Weeks, and will promptly
provide Weeks with copies of any notice given by Duke OP and received by the
Duke OP Unitholders.

              (e)  Notwithstanding any other provision of this Agreement to the
contrary, this Agreement shall not impose any duty on any Duke Stockholder or
Duke OP Unitholder in his/her capacity as director of Duke which, in the
exercise of such director's good faith judgment, violates his/her fiduciary
duties to the shareholders of Duke.

          2.  Covenants by the Duke Stockholders.  The Duke Stockholders,
              ----------------------------------
individually, hereby covenant and agree that they will not, and will not agree
to, directly or indirectly, sell, transfer, assign, pledge, hypothecate, cause
to be redeemed or otherwise dispose of any of the Duke Shares, or grant any
proxy, power-of-attorney or other authorization or interest in or with respect
to such Duke Shares, or deposit such Duke Shares into a voting trust or enter
into a voting agreement or arrangement with respect to such Duke Shares unless
and until they shall have taken all actions (including, without limitation, the
endorsement of a legend on the certificates evidencing such Duke Shares)
necessary to ensure that such Duke Shares shall at all times be subject to the
rights, powers and privileges granted or conferred, and subject to all
restrictions, covenants and limitations imposed, by this Agreement and shall
have caused any transferee of any of the Duke Shares to execute and deliver to
the other party hereto, an Agreement and Irrevocable Proxy consistent with the
terms contained herein.

          3.  Covenants by the Duke OP Unitholders.  The Duke OP Unitholders,
              ------------------------------------                           
individually, hereby covenant and agree that they will not, and will not agree
to, directly or indirectly, sell, transfer, assign, pledge, hypothecate, cause
to be redeemed or otherwise dispose of any of the Duke OP Units, or grant any
proxy, power-of-attorney or other authorization or interest in or with respect
to such Duke OP Units, or deposit such Duke OP Units into a voting

                                       2
<PAGE>
 
trust or enter into a voting agreement or arrangement with respect to such Duke
OP Units unless and until they shall have taken all actions necessary to ensure
that such Duke OP Units shall at all times be subject to the rights, powers and
privileges granted or conferred, and subject to all restrictions, covenants and
limitations imposed, by this Agreement and shall have caused any transferee of
any of the Duke OP Units to execute and deliver to the other party hereto, an
Agreement and Irrevocable Proxy consistent with the terms contained herein.

          4.  Representation and Warranty.  Each of the Duke Stockholders and
              ---------------------------
the Duke OP Unitholders represents and warrants to Weeks that he, she, or it has
full power and authority to enter into this Agreement, to grant the Proxy and to
perform its obligations hereunder.

          5.  Miscellaneous.
              ------------- 

              (a)  The terms and provisions of this Agreement shall be governed
by and construed in accordance with the laws of the State of Indiana without
giving effect to the conflicts of law provisions thereof.

              (b)  EACH OF THE DUKE STOCKHOLDERS, THE DUKE OP UNITHOLDERS AND
WEEKS AGREE THAT THE PROXY AND ALL OTHER POWER AND AUTHORITY INTENDED TO BE
CONFERRED HEREBY ARE COUPLED WITH AN INTEREST SUFFICIENT IN LAW TO SUPPORT AN
IRREVOCABLE POWER AND SHALL NOT BE TERMINATED BY ANY ACT OF THE DUKE
STOCKHOLDERS, THE DUKE OP UNITHOLDERS OR WEEKS, BY LACK OF APPROPRIATE POWER OR
AUTHORITY OR BY THE OCCURRENCE OF ANY OTHER EVENT OR EVENTS EXCEPT AS PROVIDED
HEREIN.

              (c)  THIS POWER OF ATTORNEY SHALL NOT BE AFFECTED BY THE DEATH OR
DISABILITY OF ANY DUKE STOCKHOLDER OR DUKE OP UNITHOLDER.

              (d)  This Agreement and the Proxy granted hereunder shall
terminate immediately upon the termination of the REIT Merger Agreement or the
consummation of the transactions contemplated thereby.

              (e)  Each of the Duke Stockholders and the Duke OP Unitholders
acknowledge and agree that performance of their respective obligations hereunder
will confer a unique benefit on Weeks and that a failure of performance will
result in irreparable harm to the other and will not be compensable by money
damages. The parties therefore agree that this Agreement, including the Proxy,
shall be specifically enforceable and that specific enforcement and injunctive
relief shall be remedies properly available to the other party for any breach of
any agreement, covenant or representation of the other hereunder. The terms and
provisions of this Agreement shall be binding upon, inure to the benefit of, and
be enforceable by and against the personal representatives, heirs, successors
and assigns of the parties hereto.

              (f)  Each of the Duke Stockholders and the Duke OP Unitholders
will, upon request, execute and deliver any additional documents and take such
further actions as may reasonably be deemed by Weeks to be necessary or
desirable to complete the proxies granted herein or to carry out the provisions
hereof.

                                       3
<PAGE>
 
              (g)  If any term, provision, covenant or restriction of this
Agreement, or the application thereof to any circumstance, shall, to any extent,
be held by a court of competent jurisdiction to be invalid, void or
unenforceable, the remainder of the terms, provisions, covenants and
restrictions of this Agreement or the application thereof to any other
circumstance, shall remain in full force and effect, shall not in any way be
affected, impaired or invalidated and shall be enforced to the fullest extent
permitted by law.

              (h)  This Agreement may be executed in counterparts, each of which
shall be deemed to be an original but all of which together shall constitute one
and the same document.

          IN WITNESS WHEREOF, the Duke Stockholders, Duke OP Unitholders and
Weeks have duly executed this Agreement or caused this Agreement to be duly
executed as of the date first above written.

                              WEEKS CORPORATION

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

                                       4

<PAGE>
 

                                                                  EXHIBIT 10.4

                                                                       EXHIBIT B



                        AGREEMENT AND IRREVOCABLE PROXY


         AGREEMENT and IRREVOCABLE PROXY (the "Agreement"), dated as of February
                                               ---------                        
28, 1999, by and among the undersigned shareholders of Weeks Corporation (the
                                                                             
"Weeks Shareholders"), the undersigned principal holders of units of limited
- -------------------                                                         
partner interest in Weeks Realty, L.P. (the "Weeks OP Unitholders"), and Duke
                                             --------------------            
Realty Investments, Inc., an Indiana corporation ("Duke").
                                                   ----   

          A.  The Weeks Shareholders are the owners, beneficially or of record,
of certain shares of common stock, par value $0.01 per share (all such shares,
the "Weeks Shares"), of Weeks Corporation, a Georgia corporation ("Weeks") as
     ------------                                                  -----     
set forth on Schedule A;
             ---------- 

          B.  The Weeks OP Unitholders are the owners, beneficially or of
record, of certain units of limited partner interest (all such units, the "Weeks
                                                                           -----
OP Units") of Weeks Realty, L.P., a Georgia limited partnership ("Weeks OP") as
- --------                                                          --------     
set forth on Schedule A;
             ---------- 

          C.  Simultaneously with the execution and delivery of this Agreement,
Duke and Weeks are entering into an Agreement and Plan of Merger (the "REIT
                                                                       ----
Merger Agreement") pursuant to which Weeks will merge with and into Duke and
- ----------------                                                            
Duke Realty Limited Partnership, an Indiana limited partnership ("Duke OP"), and
                                                                  -------       
Weeks OP are entering into an Agreement and Plan of Merger (the "OP Merger
                                                                 ---------
Agreement" and together with the REIT Merger Agreement, the "Merger Agreements")
- ---------                                                    -----------------  
pursuant to which Weeks OP will merge with and into Duke OP (the "OP Merger");
                                                                  ---------   

          D.  As a condition to the willingness of Duke, and Duke OP to enter
into the Merger Agreements, and in order to induce Duke and Duke OP to enter
into the Merger Agreements, the Weeks Shareholders and the Weeks OP Unitholders
have agreed to enter into this Agreement.

          In consideration of the promises and mutual covenants provided herein,
and other good and sufficient consideration, the receipt of which is
acknowledged by each party hereto, the parties hereto agree as follows:


          1.   Proxy.
               ----- 

          (a) Each of the Weeks Shareholders and Weeks OP Unitholders hereby
irrevocably constitute and appoint Duke as their true and lawful proxy and
attorney-in-fact, for and in the name, place and stead of each of the Weeks
Shareholders and Weeks OP Unitholders, solely
<PAGE>
 
to vote or cause to be voted all of the Weeks Shares and the Weeks OP Units,
together with any additional shares of Weeks common stock and units of limited
partner interest in Weeks OP that such Weeks Shareholders and Weeks OP
Unitholders shall acquire, between the date of this Agreement and the date of
termination of this Agreement (i) in favor of the Merger Agreements, the REIT
Merger and the OP Merger, respectively, and any other actions and transactions
contemplated in connection therewith and (ii) against any Competing Transaction
(as defined in the Merger Agreements), in each case, at any annual, special or
other meeting of the shareholders of Weeks and/or the limited partners of Weeks
OP, as the case may be, and at any adjournment or postponements thereof (each, a
"Meeting"), or pursuant to any written consent in lieu of a meeting or
 -------
otherwise.

          (b) In the event that Duke is unable or declines to exercise the power
and authority granted by the Proxy for any reason, each of the Weeks
Shareholders and the Weeks OP Unitholders covenant and agree to vote or cause to
be voted all of the Weeks Shares in favor of approval and adoption of the Merger
Agreements and the REIT Merger, and the Weeks OP Units in favor of the Merger
Agreements and the OP Merger, and any other actions and transactions
contemplated in connection therewith at any Meeting and, upon request of Duke,
to provide their written consent thereto.

          (c) The Weeks Shareholders hereby covenant and agree that they will
not vote, cause to be voted or take any action by written consent of
shareholders in lieu of a meeting on any matter which is subject to this
Agreement without the prior written consent of Duke, and will promptly provide
Duke with copies of any shareholder notices given by Weeks and received by the
Weeks Shareholders.

          (d) The Weeks OP Unitholders hereby covenant and agree that they will
not vote, cause to be voted or take any action by written consent of limited
partners of Weeks OP in  lieu of a meeting on any matter which is subject to
this Agreement without the prior written consent of Duke, and will promptly
provide Duke with copies of any notice given by Weeks OP and received by the
Weeks OP Unitholders.

          (e) Notwithstanding any other provision of this Agreement to the
contrary, this Agreement shall not impose any duty on any Weeks Shareholder or
Weeks OP Unitholder in his capacity a director of Weeks which, in the exercise
of such director's good faith judgment, violates his fiduciary duties to the
shareholders of Weeks.

          2.   Covenants by the Weeks Shareholders.  The Weeks Shareholders,
               -----------------------------------                          
individually, hereby covenant and agree that they will not, and will not agree
to, directly or indirectly, sell, transfer, assign, pledge, hypothecate, cause
to be redeemed or otherwise dispose of any of the Weeks Shares, or grant any
proxy, power-of-attorney or other authorization or interest in

                                       2
<PAGE>
 
or with respect to such Weeks Shares, or deposit such Weeks Shares into a voting
trust or enter into a voting agreement or arrangement with respect to such Weeks
Shares unless and until they shall have taken all actions (including, without
limitation, the endorsement of a legend on the certificates evidencing such
Weeks Shares) necessary to ensure that such Weeks Shares shall at all times be
subject to the rights, powers and privileges granted or conferred, and subject
to all restrictions, covenants and limitations imposed, by this Agreement and
shall have caused any transferee of any of the Weeks Shares to execute and
deliver to the other party hereto, an Agreement and Irrevocable Proxy consistent
with the terms contained herein.

          3.   Covenants by the Weeks OP Unitholders.  The Weeks OP Unitholders,
               -------------------------------------                            
individually, hereby covenant and agree that they will not, and will not agree
to, directly or indirectly, sell, transfer, assign, pledge, hypothecate, cause
to be redeemed or otherwise dispose of any of the Weeks OP Units, or grant any
proxy, power-of-attorney or other authorization or interest in or with respect
to such Weeks OP Units, or deposit such Weeks OP Units into a voting trust or
enter into a voting agreement or arrangement with respect to such Weeks OP Units
unless and until they shall have taken all actions necessary to ensure that such
Weeks OP Units shall at all times be subject to the rights, powers and
privileges granted or conferred, and subject to all restrictions, covenants and
limitations imposed, by this Agreement and shall have caused any transferee of
any of the Weeks OP Units to execute and deliver to the other party hereto, an
Agreement and Irrevocable Proxy consistent with the terms contained herein.

          4.   Representation and Warranty.  Each of the Weeks Shareholders and
               ---------------------------                                     
the Weeks OP Unitholders represents and warrants to Duke that he, she, or it has
full power and authority to enter into this Agreement, to grant the Proxy and to
perform his, her or its obligations hereunder.

          5.   Miscellaneous.
               ------------- 

          (a) The terms and provisions of this Agreement shall be governed by
and construed in accordance with the laws of the State of Indiana without giving
effect to the conflicts of law provisions thereof.

          (b) EACH OF THE WEEKS SHAREHOLDERS, THE WEEKS OP UNITHOLDERS AND DUKE
AGREE THAT THE PROXY AND ALL OTHER POWER AND AUTHORITY INTENDED TO BE CONFERRED
HEREBY ARE COUPLED WITH AN INTEREST SUFFICIENT IN LAW TO SUPPORT AN IRREVOCABLE
POWER AND SHALL NOT BE TERMINATED BY ANY ACT OF THE WEEKS SHAREHOLDERS, THE
WEEKS OP UNITHOLDERS OR DUKE, BY LACK OF APPROPRIATE POWER OR AUTHORITY OR BY
THE OCCURRENCE OF ANY OTHER EVENT OR EVENTS EXCEPT AS PROVIDED HEREIN.

                                       3
<PAGE>
 
          (c) THIS POWER OF ATTORNEY SHALL NOT BE AFFECTED BY THE DEATH OR
DISABILITY OF ANY WEEKS SHAREHOLDER OR WEEKS OP UNITHOLDER.

          (d) This Agreement and the Proxy granted hereunder shall terminate
immediately upon the termination of the REIT Merger Agreement or the
consummation of the transactions contemplated thereby.

          (e) Each of the Weeks Shareholders and the Weeks OP Unitholders
acknowledge and agree that performance of their respective obligations hereunder
will confer a unique benefit on Duke and that a failure of performance will
result in irreparable harm to the other and will not be compensable by money
damages.  The parties therefore agree that this Agreement, including the Proxy,
shall be specifically enforceable and that specific enforcement and injunctive
relief shall be remedies properly available to the other party for any breach of
any agreement, covenant or representation of the other hereunder.  The terms and
provisions of this Agreement shall be binding upon, inure to the benefit of, and
be enforceable by and against the personal representatives, heirs, successors
and assigns of the parties hereto.

          (f) Each of the Weeks Shareholders and the Weeks OP Unitholders will,
upon request, execute and deliver any additional documents and take such further
actions as may reasonably be deemed by Duke to be necessary or desirable to
complete the proxies granted herein or to carry out the provisions hereof.

          (g) If any term, provision, covenant or restriction of this Agreement,
or the application thereof to any circumstance, shall, to any extent, be held by
a court of competent jurisdiction to be invalid, void or unenforceable, the
remainder of the terms, provisions, covenants and restrictions of this Agreement
or the application thereof to any other circumstance, shall remain in full force
and effect, shall not in any way be affected, impaired or invalidated and shall
be enforced to the fullest extent permitted by law.

          (h) This Agreement may be executed in counterparts, each of which
shall be deemed to be an original but all of which together shall constitute one
and the same document.

                                       4
<PAGE>
 
          IN WITNESS WHEREOF, the Weeks Shareholders, Weeks OP Unitholders and
Duke have duly executed this Agreement or caused this Agreement to be duly
executed as of the date first above written.

                              DUKE REALTY INVESTMENTS, INC.


                              By:_______________________________
                                 Name:
                                 Title:


                              WEEKS SHAREHOLDERS

 
                              __________________________________
 


                              WEEKS OP UNITHOLDERS

 
                              __________________________________

                                       5
  

<PAGE>
 
                                                                    EXHIBIT 99.1

    Duke Realty Investments and Weeks Corporation
    Announce Agreement to Merge

    $1.7 billion transaction to create a dominant $5.2 billion
    diversified real estate company with a significant presence in
    the Midwest and the Sunbelt

    Merger will combine REIT industry's most consistent growth companies

    Indianapolis and Atlanta -- Duke Realty Investments, Inc., (DRE/NYSE) and
    Weeks Corporation (WKS/NYSE) announced today that they have agreed to merge
    their operations. The combination will create a diversified real estate
    company with a total market capitalization in excess of $5.2 billion. The
    combined company will be a preeminent real estate investment trust (REIT),
    specializing in industrial and office buildings and business parks with 13
    key geographic platforms throughout the Midwest and the Sunbelt.

    The combined company, which will operate under the name Duke-Weeks Realty
    Corporation, will have more than 90 million square feet of primarily
    industrial and office properties and will own or control nearly 4,650 acres
    of undeveloped land that management estimates can support an additional 63
    million square feet of future development. Duke-Weeks together will become
    an even stronger competitor in the industrial/office REIT arena with more
    than $500 million in revenue from approximately 5,000 tenants, more than
    1,300 employees, and greater market presence and geographic diversity.

    The merger also brings together the entire management and operations of the
    industry's most consistent growth companies: Duke and Weeks are the two
    REITs with the longest ongoing records (at least 13 consecutive quarters) of
    double-digit FFO growth per share. Duke and Weeks are also two of the real
    estate industry's most acclaimed companies. Weeks Corporation was recently
    named Industrial Developer of the Decade in Atlanta by the Atlanta Business
    Chronicle, and Duke was listed as the top-performing equity REIT for the
    past five years in the Wall Street Journal's ranking of 1,000 major U.S.
    companies.

    Under the terms of the merger agreement, which was unanimously approved by
    the Boards of Directors of both companies, each of Weeks' common shares will
    be exchanged for 1.38 shares of Duke common stock. Based on Duke's closing
    price of $21.8125 per share on February 26, 1999, the total merger
    consideration, including assumption of debt and preferred stock, is
    approximately $1.7 billion. Weeks' shareholders will own approximately 28
    percent of the combined 
<PAGE>
 
    company on a diluted basis.

    Following the close of the merger, which is expected in the second quarter
    of 1999, and subject to changes in market or operating conditions, Duke-
    Weeks intends to increase its dividend to an annualized level of at least
    $1.48 per share, an 8.8 percent increase over Duke's current annualized
    dividend of $1.36 per share. Adjusted for the exchange ratio, this dividend
    increase will more than preserve the current level of dividend income to
    Weeks' shareholders.

    Upon completion of the transaction, Thomas L. Hefner, chairman, president
    and chief executive officer of Duke, will be chairman and chief executive
    officer of Duke-Weeks, headquartered in Indianapolis, Indiana. A. Ray Weeks,
    Jr., chairman and chief executive officer of Weeks Corporation, will become
    vice chairman, president, and chief operating officer of Duke-Weeks. Mr.
    Weeks will be based in Atlanta, where the new company will maintain its
    primary hub for the Sunbelt. In addition to the integration of the two
    management teams, the Board of the combined company will comprise a broad
    representation of current Duke and Weeks directors, with a majority of the
    directors from Duke's Board.

    Among the near-term strategic priorities of Duke-Weeks will be increasing
    market share in its existing cities, seizing the opportunities created by
    the combined base of tenants, and expanding further into other major growth
    markets in the Midwest and Sunbelt.

    Tom Hefner said: "We are extremely pleased to expand our geographic presence
    through a merger with such a closely matched company. Duke and Weeks both
    have a record of consistent double-digit earnings growth and leadership in
    customer service, product development, technology, and capital market
    strategies. We believe that the long-term winners in this business will be
    those companies, like Duke and Weeks, with the proven ability to add value
    for tenants and shareholders alike through a vertically integrated operating
    company platform. Although we believe this transaction will add
    approximately four to five cents per share next year to our annual funds
    from operations before any modest cost savings are considered, we are
    merging primarily because we are convinced that together we will be able to
    enhance our long-term growth rate.

    "In that regard," he continued, "I would like to emphasize what this merger
    is and is not about. This merger is about enhancing top-line revenue growth
    both internally and externally. It's about combining two of the most
    experienced and most respected management teams in the business, with an
    average of 17 years of real estate experience among the top officers. And,
    equally important, this merger is about combining the job growth and other
    highly positive demographic trends of the Sunbelt with the consistency and
    solid performance of the Midwest. This merger is not simply about getting
    bigger, about short-term accretion, or about cutting the resources that have
    made our companies the successes they 
<PAGE>
 
    are."

    Ray Weeks said: "Each of our companies has a proud and successful history of
    accomplishment. For more than 25 years, Duke and Weeks have been delivering
    the highest quality real estate services to their respective customers in
    the Midwest and the Sunbelt. But even more important than our proven track
    records is our shared vision to create a formidable industrial and office
    real estate company best positioned to serve its customers from Minneapolis
    to Miami and virtually every major market in between."

    Merrill Lynch & Co. is acting as the financial advisor for Duke, and
    Goldman, Sachs & Co. is acting as the financial advisor for Weeks. The
    merger is subject to approval of both Duke's and Weeks' shareholders.

    The supplemental information accompanying this release can be obtained on
    the Duke (www.dukereit.com) and Weeks (www.weekscorp.com) web sites in the
    Investor Information sections of those sites. It is also available through a
    fax-on-demand service by dialing 1-800-356-0852 (document #9002).

    Senior management from both Duke and Weeks will host a joint conference call
    for institutional investors and industry analysts at 2:00 p.m. (EST) today.
    All other interested parties are welcome to have live access to this call
    via the Internet through the Vcall website at www.vcall.com. Soon after the
    call has ended, a replay will be available through March 2, 1999, by dialing
    1-888-568-0765.

    Certain matters discussed within this press release may be deemed to be
    forward- looking statements within the meaning of the Private Securities
    Litigation Reform Act of 1995. Although the companies believe the
    expectations reflected in such forward-looking statements are based on
    reasonable assumptions, they can give no assurance that their expectations
    will be attained. Factors that could cause actual results to differ
    materially from expectations include real estate conditions, information
    determined in the course of due diligence review, changes in local or
    national economic conditions and other risks detailed from time to time in
    the companies' SEC reports and filings, including their quarterly reports on
    form 10-Q, reports on Form 8-K, and annual reports on Form 10-K. The
    companies assume no obligation to update or supplement forward-looking
    statements that become untrue because of subsequent events.

    Duke and Weeks plan to file with the Securities and Exchange Commission a
    joint proxy statement/prospectus regarding their merger. Interested parties
    should read that document when it becomes available because it will contain
    important information about the transaction. Any information in this press
    release that is inconsistent with the information contained in the joint
    proxy statement/prospectus shall be superseded by the information in the
    joint proxy statement/prospectus. A copy of the joint proxy
<PAGE>
 
    statement/prospectus once filed will be available for free at the
    Commission's website at www.sec.gov or by contacting Shona Bedwell of Duke
    at 317/808-6169 or Susan Walker of Weeks at 770/717-3260.

    Duke Realty Investments is a fully integrated real estate company that owns
    interests in a diversified portfolio of primarily industrial and office
    properties located in eight Midwestern cities. This portfolio includes 493
    properties, encompassing approximately 60 million square feet. Duke Realty
    also owns or controls more than 2,775 acres of land that management
    estimates can support approximately 43 million square feet of future
    developments.

    Weeks Corporation is a fully integrated real estate company that owns
    interests in a portfolio of primarily industrial and suburban office
    properties located in 10 Sunbelt cities. Its portfolio includes 352
    properties, encompassing approximately 31 million square feet. Weeks
    Corporation also owns or controls more than 1,870 acres of land that
    management estimates have a development potential of approximately 20
    million square feet.

    Both Duke and Weeks provide leasing, management, development, construction,
    landscaping and other tenant-related services for their own properties and
    for properties owned by others.

    For Investor Inquiries, contact:

    Gene Zink at Duke: 317/808-6026
    Dave Stockert at Weeks: 770/717-3204
    Thomas Peck at Duke: 317/808-6168
    Susan Walker at Weeks: 770/717-3260

    For Media Inquiries, contact:

    Donna Hovey at Duke: 317/808-6137
    Susan Walker at Weeks: 770/717-3260

<PAGE>
 
                                                                    Exhibit 99.2

                         DUKE-WEEKS REALTY CORPORATION

                               MERGER AGREEMENT

                           SUPPLEMENTAL INFORMATION

                                 MARCH 1, 1999

                               
<TABLE>
<CAPTION>
                               Page                                                   Page
<S>                            <C>              <C>                                    <C>
Transaction Description          1              Largest Tenants Summary                10 

Key Reasons for Merger           2              Lease Expiration Schedule              11

Questions & Answers          3 - 4              Development Backlog                    12

Balance Sheets                   5              Undeveloped Land - Inventory Summary   13

Ratio Computation                6              Organizational Chart                   14

Occupancy Analysis               7              Market Information                     15

Product Mix                      8              Combined Map                           16 

Geographic Highlights            9
</TABLE> 


Duke and Weeks plan to file with the Securities and Exchange Commission a joint
proxy statement/prospectus regarding their merger. Interested parties should
read that document when it becomes available because it will contain important
information about the transaction. Any information in this document that is
inconsistent with the information contained in the joint proxy
statement/prospectus shall be superseded by the information in the joint proxy
statement/prospectus. A copy of the joint proxy statement/prospectus once filed
will be available for free at the Commission's website at www.sec.gov or by
contacting Shona Bedwell of Duke at 317/808-6169 or Susan Walker of Weeks at
770/717-3260.
<PAGE>
 
Transaction Description

Exchange Ratio - Each common share of Weeks Corporation stock will be exchanged
- --------------                                                                
for 1.38 shares of Duke Realty Investments common stock

Transaction Value - Approximately $1.7 billion including $812 million of common
- -----------------                                                              
equity, $654 million of assumed debt, and $250 million of preferred stock and
units (at liquidation value)

Transaction Structure - Tax-free merger of Weeks Corporation into Duke Realty
- ---------------------                                                       
Investments, Inc.

Closing - Expected in the second quarter of 1999
- -------                                        

Total Market Capitalization - $5.2 billion consisting of 56 percent common
- ---------------------------                                               
equity, 12 percent preferred equity, and 32 percent debt

Board Changes - It is the intent of both companies to merge their Boards of
- -------------                                                             
Directors into a combined Board that will have a majority of unaffiliated
members. A majority of all directors and a majority of the unaffiliated
directors of the combined Board will be from Duke.

Management/Employee Changes - The Company currently expects to retain
- ---------------------------                                         
substantially all of the employees of both Duke and Weeks

Company Name - The combined Company will operate as Duke-Weeks Realty 
- ------------                                                                    
Corporation

Headquarters  Indianapolis, Indiana; Southeast Regional Headquarters  Atlanta,
- ------------                                                                  
Georgia

                                       1
<PAGE>
 
Key Reasons for the Merger

Value-Added Platforms - Management at both Duke and Weeks believe that the long-
- ----------------------                                                         
term winners in the real estate business will be those companies that truly can
add value for their customers through a high level of vertical integration. As
such, both Duke and Weeks have proven over the past 25-30 years that by first
focussing on customers' needs, they can also produce superior performance for
their investors. Particularly important components of the value-added process
are extensive development capabilities and undeveloped land holdings, strong
market positions, long-standing market knowledge and customer relationships, and
a portfolio of properties located primarily in controlled business park
environments.

As a combined company, Duke and Weeks will have a much broader platform to
extend their proven operating strategy into a wider geographic area encompassing
much of the eastern United States. Foremost in the combined Company's future
growth plans is to have an operational infrastructure that will allow it to
operate new properties in new markets as efficiently as it can in its existing
markets. Duke management believes that its merger with Weeks will allow it to
gain such an infrastructure several years sooner than if it otherwise tried to
build its own platform in the Sunbelt.

Demographics - While its Midwestern markets are strong and stable, Duke
- ------------                                                          
management believes that Weeks' markets offer higher potential for job growth
and absorption of office and industrial real estate.

Customer Synergies - Duke has many clients with operations in Weeks' markets and
- ------------------                                                             
vice versa. The integration of the two companies will allow the combined
organization to better serve its base of satisfied customers in new regions of
the country.

Operational Synergies - By combining the best practices of two highly successful
- ---------------------                                                          
and complementary organizations, the combined Company believes that it will be
able to further refine its delivery system of operating and developing suburban
office and industrial real estate.

Market Synergies - Duke currently has eight operating platforms (Indianapolis,
- ----------------                                                             
Cincinnati, Columbus, Cleveland, Minneapolis, Chicago, St. Louis, and
Nashville). Weeks currently has six operating platforms (Atlanta, Raleigh-
Durham, North/Central Florida, South Florida, Dallas and Nashville). Duke-Weeks
will have 13 operating platforms and will have dominant (at least 50 percent
more square feet than the next largest competitor) positions in the suburban
office and industrial markets of Indianapolis, Cincinnati, Cleveland, Columbus,
and St. Louis, and will also have dominant positions in the Atlanta and
Nashville industrial markets.

Financial Position - The combined company will have a $5.2 billion total market
- ------------------                                                            
capitalization made up of 68 percent equity and 32 percent debt. In the
immediate future, it is expected that the combined Company will benefit from
Duke's lower cost of debt and equity capital. Over time, Duke expects to be able
to access debt and equity capital more efficiently than it can currently because
of its increased size, diversification and growth prospects.

                                       2
<PAGE>
 
Questions & Answers Regarding the Transaction

1.  When will the proxy statement for the merger be on file? Both Duke and Weeks
    hope to file a joint proxy statement/prospectus regarding their merger by
    about March 22, 1999. Approximately 48 hours after the announcement of the
    merger and until the proxy statement is filed, both Duke and Weeks will be
    in a "quiet period" and are required to refrain from commenting about the
    transaction. Following the filing of the proxy statement and before
    shareholders vote on the merger, each company will be restricted to
    discussing information that is contained in the joint proxy
    statement/prospectus.

2.  How accretive will the transaction be? Management expects the transaction to
    add approximately four to five cents to Duke's funds from operations per
    share next year prior to considering any modest cost savings that may
    eventually result from the merger.

3.  What are your expected cost savings and when do you expect them to
    materialize? Cost savings are not an important reason for the merger and
    significant immediate cost savings are not expected since the Company
    expects to retain substantially all of both Duke's and Weeks' employees. As
    such, the Company will not provide an estimate of any future cost savings
    that may result from the transaction.

4.  Will you need to raise new equity capital as a result of this transaction?
    No, on a proforma basis, the combined Company will have a debt-to-total
    market capitalization ratio of 32 percent and interest and fixed-charge
    coverage ratios of 4.05 and 2.73, respectively. On an ongoing basis, both
    debt and equity capital will be raised when appropriate in the continuing
    operation of the Company's business.

5.  What will happen to the debt ratings of the post-merger company? Currently,
    Duke's senior unsecured debt ratings are BBB+ at Standard and Poors and Duff
    and Phelps, and Baa2 at Moodys. Following the merger with Weeks, the Company
    expects to continue to manage its balance sheet prudently and to maintain
    ample financial flexibility. While the Company cannot provide any assurance
    as to how the rating agencies will view its merger with Weeks, management
    believes that, on balance, the transaction will favorably affect the
    Company's credit quality. Specifically, management believes that its merger
    with Weeks will substantially mitigate the rating agency's previous concern
    about the Company's concentration in the Midwest.

6.  Are there any caps, collars, or break-up fees contained in the merger
    agreement? There are no caps, collars or any other mechanisms that would
    alter the exchange ratio of 1.38 Duke shares for each Weeks share. The
    definitive merger agreement specifies a breakup fee of $50 million.

                                       3
<PAGE>
 
7.  What will be the ongoing strategy of the combined company? The strategy of
    the combined Company is to blend the same basic strategy that both Duke and
    Weeks have historically deployed separately. Key components of this strategy
    include satisfying customer needs through a vertically integrated platform
    of real estate services, pursuing dominant positions in each market where it
    operates, utilizing each company's extensive development capabilities and
    land holdings, pursuing value-added acquisitions, and focusing on Class-A
    properties in business park environments with excellent long-term investment
    horizons. The Company also expects to blend the best practices of both Duke
    and Weeks to further refine its delivery system of real estate services.

8.  When will the combined company pay dividends and is the dividend changing?
    Duke has reviewed and increased its common stock dividend in the third
    quarter of each of the last several years. Subject to changes in market or
    operating conditions, it is the intent of Duke's Board to maintain its
    current quarterly common stock dividend of $0.34 per share for the second
    quarter of 1999, and then, following the merger, raise the quarterly
    dividend in the third quarter to at least $0.37 per share. This increase of
    at least 8.8 percent will allow Weeks shareholders to more than preserve
    their current level of dividend income following the merger.
 
    The combined Company expects to continue to pay quarterly common stock
    dividends according to Duke's current schedule of paying dividends on the
    last business day of February, May, August, and November.

    Dividends on both Duke's and Weeks' preferred stock issues are expected to
    continue to be paid in accordance with their original terms.

9.  Do you anticipate divesting any properties following the merger? Both Duke
    and Weeks routinely evaluate their properties and sometimes choose to sell
    certain properties that are no longer consistent with their investment
    focus. While this routine evaluation is expected to continue to result in
    property sales, the combined Company does not expect to "spin-off" any
    particular group of properties in the immediate future.

10. What is the accounting treatment of the merger and what are the tax
    implications to Weeks shareholders? The purchase method of accounting will
    be used to account for the merger. Weeks common and preferred shareholders
    will convert to Duke shares via the merger on a tax-free basis and their
    basis and holding period in their shares will remain unchanged.

11. Is the pending merger with Weeks a sign of things to come? After completion
    of the merger, the Company's top priority will be to integrate the Weeks
    organization as efficiently as possible. Over time, the merger with Weeks
    will give the combined organization a much broader platform to pursue future
    growth opportunities. With more than 90 percent of office and industrial
    real estate still held by private enterprises in the United States, the
    Company will continue to look at both private and public opportunities.

                                       4
<PAGE>
 
<TABLE>
<CAPTION>
DUKE-WEEKS REALTY CORPORATION
BALANCE SHEETS
(IN THOUSANDS)
                                                                               Pro-Forma
                                                                               Duke-Weeks
                                                             Duke          Realty Corporation
                                                          December 31,        December 31,
                                                             1998                 1998
                                                         --------------   --------------------
<S>                                                       <C>             <C>
ASSETS:

  Rental Property                                           $2,403,779           $4,005,180
  Less: Accumulated Depreciation                              (179,887)            (276,270)
  Construction in Progress                                     185,950              346,733
  Land Held for Development                                    146,911              189,349
                                                             ----------           ----------
  Net Real Estate Investments                                2,556,753             4,264,992
                                                             ----------           ----------

  Cash                                                           6,950                 8,453
  Accounts Receivable                                            9,641                19,124
  Straight-line Rents Receivable                                20,332                20,332
  Receivables on Construction Contracts                         29,162                29,162
  Investments in Unconsolidated Companies                      125,746               204,589
  Deferred Financing Costs, Net                                 11,382                11,382
  Deferred Leasing and Other Costs, Net                         53,281                53,281
  Escrow Deposits and Other Assets                              40,406                55,275
                                                             ----------             ----------
    Total Assets                                                $2,853,653            $4,666,590
                                                                ==========            ==========

LIABILITIES AND SHAREHOLDERS' EQUITY:

  Secured Debt                                                  $  326,317              $ 77,716
  Unsecured Notes                                                  590,000                90,000
  Unsecured Line of Credit                                          91,000                94,025
  Construction Payables and Amounts due Subcontractors              55,012                61,419
  Accounts Payable                                                   4,836                 9,830
  Accrued Real Estate Taxes                                         36,075                39,662
  Accrued Interest                                                  10,329                17,431
  Accrued Expenses                                                  22,781                33,668
  Other Liabilities                                                 21,928                21,928
  Tenant Security Deposits and Prepaid Rents                        18,534                28,160
                                                                ----------            ----------
    Total Liabilities                                            1,176,812             1,873,839
                                                                ----------            ----------
  Minority Interest                                               106,729               441,399
                                                                ----------            ----------

  Preferred Stock and Additional Paid-in Capital                  347,798               497,798
  Common Stock and Additional Paid-in Capital                   1,290,313             1,921,553
  Distributions in Excess of Net Income                           (67,999)              (67,999)
                                                               ----------            ----------
    Total Shareholders' Equity                                  1,570,112             2,351,352
                                                               ----------            ----------
    Total Liabilities and Shareholders' Equity                 $2,853,653            $4,666,590
                                                               ==========            ==========
</TABLE>

                                       5
<PAGE>
 
DUKE-WEEKS REALTY CORPORATION
FINANCIAL RATIO ANALYSIS


DECEMBER 31, 1998
(IN THOUSANDS)
<TABLE>
<CAPTION>
                                                                                                           Pro-Forma
                                                                                                           Duke-Weeks
                                                                                           Duke Realty       Realty
                                                                                           Investments    Corporation
                                                                                          -------------  -------------
<S>                                                                                         <C>           <C>
FINANCIAL POSITION RATIOS
 
  Total Debt/Total Book Capitalization Ratio (book value) (%)                                    39.08%         41.41%

  Total Debt/Total Market Capitalization Ratio (market value) (%) (1)                            27.75%         30.80%

  Total Debt/Adjusted Total Assets (%)                                                           34.62%         34.87%

  Secured Debt/Adjusted Total Assets (%)                                                         11.21%         12.12%

  Undepreciated Unsecured Assets/Unsecured Debt (x)                                               3.28           3.24

  Secured Debt/Secured Assets (%)                                                                56.90%         51.88%

OPERATIONAL RATIOS

  Debt Service Coverage Ratio
    (Funds from Operations + Interest Expense + Pref Div/Interest + Principal Amort.) (x)         3.79           3.62

  Fixed Charge Coverage Ratio (Funds from Operations + Interest
    Expense + Pref Dividend/Interest Expense + Pref Div + Prin. Amort.) (x)                       2.93           2.73

  Interest Coverage Ratio (Funds from Operations + Interest Expense + Pref. Div.
    /Interest Expense) (x)                                                                        4.23           4.05

  Return on Common Shareholders' Equity (Funds from Operations/Average
    Adjusted Common Equity (book value)) (%)                                                     12.16%         11.32%

  Return on Real Estate Investments (Funds from Operations + Interest Expense +
    Pref Div/Adjusted Average Real Estate Investments as defined (book value)) (%)               10.44%         10.06%

  FFO Payout Ratio (Dividends Paid/Funds from Operations (%))                                    68.00%         70.77%

  FAD Payout Ratio (Dividends Paid/Funds Available for Distribution (%))                         77.27%         82.78%

</TABLE>
(1) Ratio is based upon the 12/31/98 closing price of Duke Realty Investments
    common stock. Based upon 2/26/99 closing price ratio would be 32.03%

                                       6
<PAGE>
 

[CAPTION]
DUKE-WEEKS REALTY CORPORATION
OWNED PROPERTY OCCUPANCY ANALYSIS
DECEMBER 31, 1998
<TABLE>
<CAPTION>
                                                                                                            PRO-FORMA
        TYPE                                      DUKE PORTFOLIO                                   DUKE-WEEKS PORTFOLIO
- ----------------------                ------------------------------------------     ------------------------------------------
<S>                                    NUMBER             TOTAL                        NUMBER           TOTAL
                                        OF                SQUARE        PERCENT          OF             SQUARE         PERCENT
                                      BUILDINGS           FEET          LEASED        BUILDINGS         FEET           LEASED
                                      ------------    ------------   ------------    ------------     -----------   -----------
PROPERTIES IN SERVICE:                <C>             <C>            <C>             <C>              <C>           <C>          

INDUSTRIAL

  SERVICE CENTERS                              102      6,122,936         93.44%              169        9,730,547      93.46%
  BULK/DISTRIBUTION                            183     29,745,256         95.39%              416       51,448,823      93.42%
OFFICE
  SUBURBAN                                     138     13,014,938         94.97%              172       15,311,434      94.30%
  CBD                                            4        861,386         96.26%                4          861,386      96.26%
RETAIL                                          26      2,283,516         95.83%               31        2,748,348      94.97%
                                      ------------     -----------    -------------     ------------   ------------  ----------
TOTAL                                          453     52,028,032         95.09%              792       80,100,538      93.67%
                                      ============     ===========    =============     ============   ============  ==========
PROPERTIES IN SERVICE AND PROJECTS UNDER DEVELOPMENT:

INDUSTRIAL
  SERVICE CENTERS                              106      6,441,204         90.56%              179       10,292,775      89.92%
  BULK/DISTRIBUTION                            199     33,892,000         89.81%              446       57,545,294      88.00%
OFFICE
  SUBURBAN                                     155     15,504,078         85.95%              200       18,930,033      83.41%
  CBD                                            4     861,386            96.26%                4          861,386      96.26%
RETAIL                                          29      2,570,328         94.22%               34        3,035,160      93.69%
                                       -----------     -----------    ------------      -----------    -----------   ---------- 
TOTAL                                          493     59,268,996         89.17%              863       90,664,648      87.53%
                                       ===========     ===========    ============      ===========    ===========   ==========
</TABLE>

                                       7
<PAGE>
 
DUKE-WEEKS REALTY CORPORATION
PRODUCT MIX
DECEMBER 31, 1998
<TABLE>
<CAPTION>

                                                                                        PRO-FORMA
                                        DUKEPORTFOLIO                              DUKE-WEEKS PORTFOLIO             
                                --------------------------------           ---------------------------------------
                                   TOTAL                                       TOTAL
                                  SQUARE         % OF       % OF              SQUARE           % OF       % OF
     TYPE                          FEET          TOTAL     TOTAL               FEET            TOTAL      TOTAL
- -------------------             ------------  ---------  --------          --------------  -----------  ----------
<S>                              <C>             <C>       <C>               <C>             <C>         <C>
PROPERTIES IN SERVICE:

INDUSTRIAL                                                 68.94%                                           76.38%
  SERVICE CENTERS                  6,122,936     11.77%                        9,730,547        12.15%
  BULK/DISTRIBUTION               29,745,256     57.17%                       51,448,823        64.23%
OFFICE                                                     26.67%                                           20.19%
  SUBURBAN                        13,014,938     25.02%                       15,311,434        19.12%
  CBD                                861,386      1.66%                          861,386         1.08%
RETAIL                             2,283,516      4.39%     4.39%              2,748,348         3.43%       3.43%
                                -------------- ------------------          ----------------- ---------------------- 
TOTAL                             52,028,032    100.00%   100.00%             80,100,538       100.00%     100.00%
                                ============== ==================          ================= ======================     


PROPERTIES UNDER DEVELOPMENT:

INDUSTRIAL                                                  61.66%                                          63.03%
  SERVICE CENTERS                    318,268      4.40%                          562,228         5.32%
  BULK/DISTRIBUTION                4,146,744     57.27%                        6,096,471        57.71%
OFFICE                                                      34.38%                                          34.25%
  SUBURBAN                         2,489,140     34.38%                        3,618,599        34.25%
  CBD                                      0      0.00%                                0         0.00%
RETAIL                               286,812      3.96%      3.96%                286,812        2.71%       2.71%
                                -------------- -------------------         ----------------- ---------------------     
TOTAL                              7,240,964    100.00%    100.00%             10,564,110      100.00%     100.00%
                                ============== ===================         ================= =====================   
ALL PROPERTIES:

INDUSTRIAL                                                  68.05%                                          74.82%
  SERVICE CENTERS                  6,441,204     10.87%                         10,292,775      11.35%
  BULK/DISTRIBUTION               33,892,000     57.18%                         57,545,294      63.47%
OFFICE                                                      27.61%                                          21.83%
  SUBURBAN                        15,504,078     26.16%                         18,930,033      20.88%
  CBD                                861,386      1.45%                            861,386       0.95%
RETAIL                             2,570,328      4.34%      4.34%               3,035,160       3.35%       3.35%
                                -------------- -------------------         ----------------- ---------------------     
TOTAL                             59,268,996     100.00%   100.00%              90,664,648     100.00%     100.00%
                                ============== ===================         ================= =====================     
</TABLE>

                                       8
<PAGE>
 
Pro-Forma Duke-Weeks Realty Corporation
Geographic Property Summary- In Service Properties as of December 31, 1998
Square Feet, Annual Rent, and Occupancy
<TABLE> 
<CAPTION> 

                                            Square Feet                                                      
                    ----------------------------------------------------------------------------------------------------------    
Primary Market                  Industrial                             Office                                                    
- --------------      --------------------------------------       --------------------                                 Percent of
                    Service Center       Bulk/Distribution       Suburban       CBD            Retail      Overall     Overall  
                    --------------       -----------------       --------       ---            ------      -------     -------
<S>                     <C>                  <C>                 <C>          <C>          <C>           <C>            <C>      
Atlanta                 1,635,419            12,451,090          1,153,182       -             48,977    15,288,668     19.10%  
Indianapolis            1,485,223            14,527,193          1,840,736    161,984         179,466    18,194,602     22.71%  
Cincinnati              1,142,170             4,268,236          3,031,632    699,402       1,387,206    10,528,646     13.14%  
St. Louis                 622,646             1,599,700          2,066,611        -               -       4,288,957      5.35%  
Columbus                   82,520             2,973,542          2,066,192        -            218,976    5,341,230      6.67%  
Minneapolis             2,057,180             3,054,423            698,249        -               -       5,809,852      7.25%  
Nashville                 956,072             2,802,419            432,529        -               -       4,191,020      5.23%  
Chicago                   111,659               802,994          1,415,330        -               -       2,329,983      2.91%  
Cleveland                  67,793             1,744,532          1,550,305        -               -       3,362,630      4.20%  
Research Triangle, N.C. 1,092,418               630,775            812,202        -               -       2,535,395      3.17%      
South Florida             105,980             1,860,996             63,240        -            415,855    2,446,071      3.05%  
North Central Florida     245,467             1,855,664            181,226        -               -       2,282,357      2.85%  
Dallas                       -                1,923,246               -           -               -       1,923,246      2.40%      
Other (2)                 126,000               954,013               -           -            497,868    1,577,881      1.97%  
                      -----------------------------------       ----------------------       ---------   ----------------------
Total                   9,730,547            51,448,823          15,311,434    861,386       2,748,348   80,100,538    100.00%  
                      ===================================       ======================       =========   ======================
                           12.14%                64.23%              19.12%     1.08%            3.43%      100.00% 
                      ===================================       ======================       =========   ===========  
</TABLE> 
<TABLE> 
<CAPTION>
                                              Percent of
Primary Market                 Annual           Annual
- --------------                 Rent(1)           Rent
                               -------           ----   
<S>                          <C>               <C>     
Atlanta                      88,896,834        $17.99%
Indianapolis                 77,231,043         15.62%
Cincinnati                   76,171,956         15.41%
St. Louis                    39,365,514         7.96%
Columbus                     38,172,401         7.72%
Minneapolis                  31,998,649         6.47%
Nashville                    25,774,478         5.21%
Chicago                      24,722,335         5.00%
Cleveland                    24,637,851         4.98%
Research Triangle, N.C.      23,940,202         4.84%
South Florida                19,587,438         3.96%
North Central Florida        10,379,668         2.10%
Dallas                        5,189,834         1.05%
Other (2)                     8,372,257         1.69%
                            --------------------------
Total                       494,440,460      $100.00%
                            ==========================    
</TABLE> 

<TABLE> 
<CAPTION> 
                                                            Occupancy %
                           ---------------------------------------------------------------------------------------------------
Primary Market                         Industrial                          Office
- --------------              -------------------------------------   ---------------------------    
                            Service Center      Bulk/Distribution    Suburban           CBD          Retail        Overall
                            --------------      -----------------   ----------         -----       ---------      ---------
<S>                           <C>                 <C>                  <C>             <C>           <C>            <C> 
Atlanta                       97.87%              92.75%               87.14%            -           97.55%         92.89%
Indianapolis                  92.00%              96.55%               94.87%          91.57%        90.89%         95.91%
Cincinnati                    90.15%              98.70%               95.11%          97.35%        95.35%         96.21%
St. Louis                     95.39%              95.45%               99.44%            -             -            97.36%
Columbus                      70.64%              93.57%               99.47%            -          100.00%         95.98%
Minneapolis                   96.50%              95.26%               91.22%            -             -            95.21%
Nashville                     90.75%              86.82%               86.54%            -             -            87.69%
Chicago                       100.00%             79.83%               94.36%            -             -            89.62%
Cleveland                     92.62%              89.43%               87.76%            -             -            88.72%
Research Triangle, N.C.       92.53%              90.08%               96.61%            -             -            93.23%
South Florida                 95.28%              93.89%              100.00%            -           89.91%         93.43%
North Central Florida         76.45%              88.77%               76.03%            -             -            86.44%
Dallas                          -                 79.99%                 -               -             -            79.99%
Other (2)                     94.29%              96.45%                 -               -           94.78%         95.75%
                            ------------------------------------    -----------------------------------------     ----------
Total                         93.46%              93.42%               94.30%          96.26%        94.97%         93.67%
                            ====================================    =========================================     ==========
</TABLE> 

(1) Represents the annual rental property revenue due from tenants in occupancy
    as of the date of this report.

(2) Represents properties not located in the Company's primary markets.

                                       9
<PAGE>
 
<TABLE>
<CAPTION>
Pro-Forma Duke-Weeks Realty Corporation
Largest Tenants
December 31, 1998
                                                     Percentage                   Percentage
                                         Square       of Total        Annual       of Annual
#   Tenant                               Footage     Square Feet       Rent          Rent
- ----------------------------------------------------------------------------------------------
<S>                                      <C>         <C>             <C>          <C>
1 General Electric Co.                     383,017           0.5%    5,941,166        $ 1.2%
2 Sterling Commerce                        322,679           0.4%    5,355,822          1.0%
3 Qwest Communications, Inc.               371,735           0.5%    5,088,771          1.0%
4 Nationwide Mutual Insurance              411,789           0.5%    4,761,399          0.9%
5 Thomson Consumer Electronics           1,521,195           2.0%    3,872,967          0.8%
6 Budget Rent-a-Car Corp.                  160,488           0.2%    3,780,095          0.7%
7 McDonnell Douglas Corp.                  299,583           0.4%    3,570,065          0.7%
8 United States Postal Service             571,493           0.8%    3,462,857          0.7%
9 Commonwealth Edison Co.                  167,286           0.2%    3,388,659          0.7%
10 Anheuser-Busch Companies                187,109           0.2%    3,272,062          0.6%
11 National General Insurance              164,652           0.2%    3,058,990          0.6%
12 Northern Telecom, Inc.                  407,180           0.5%    3,056,498          0.6%
13 Scientific Atlanta, Inc.                573,951           0.8%    2,621,439          0.5%
14 SDRC                                    221,215           0.3%    2,426,142          0.5%
15 Vanstar Corporation                     568,160           0.8%    2,373,556          0.5%
16 Southwestern Bell Yellow Pages          123,889           0.2%    2,192,835          0.4%
17 Interpath Communications, Inc.          178,456           0.2%    2,128,010          0.4%
18 Ohio National Life Insurance Co.        142,445           0.2%    2,088,211          0.4%
19 GTE Mobilnet, Inc.                      193,612           0.3%    2,084,641          0.4%
20 Continental Casualty Co.                100,991           0.1%    2,040,730          0.4%
                                        -----------------------------------------------------
                                         7,070,925           9.4%   66,564,915        $13.0%
                                        =====================================================
</TABLE>

                                       10
<PAGE>
 
DUKE-WEEKS REALTY CORPORATION
LEASE EXPIRATION COMPARISON - SQUARE FEET AND ANNUAL RENT
AS OF DECEMBER 31, 1998
(IN 000'S)

<TABLE> 
<CAPTION> 
                                           TOTAL                                                    
                                         PORTFOLIO                              INDUSTRIAL                
                                ----------------------------   ------------------------------------------
                                                                  SERVICE CENTER       BULK/DISTRIBUTION 
                                                                 ----------------     ------------------- 
YEAR OF EXPIRATION               SQUARE                         SQUARE                 SQUARE              
                                  FEET     DOLLARS       %      FEET      DOLLARS       FEET      DOLLARS
                                --------  ---------    -----   --------  ---------    --------   -------- 
<S>                              <C>       <C>         <C>      <C>      <C>           <C>        <C> 
DUKE PORTFOLIO:                                                                        
1999                             5,497    $ 34,061     10%      1,125     $ 7,022       2,757   $  9,862    
2000                             4,429      30,569      9%        990       6,519       2,029      6,535    
2001                             5,909      40,945     13%        910       6,305       3,039     10,403    
2002                             6,438      39,830     12%        875       6,119       3,736     12,858    
2003                             5,848      40,205     12%        987       7,473       3,230     11,507    
2004                             2,566      18,501      6%        259       2,136       1,526      5,926    
2005                             4,224      26,257      8%         58         526       2,860      8,981    
2006                             3,008      19,681      6%        197       1,801       2,070      7,182    
2007                             2,989      16,219      5%         83       1,011       2,261      6,620    
2008                             2,940      15,359      5%         59         534       2,388      8,164    
2009 AND THEREAFTER              5,626      45,399     14%         177      1,792       2,480      8,556     
                                ------------------               ----------------      ----------------- 
                                49,474    $327,026    100%       5,720    $41,238      28,376   $ 96,594
                                ==================               ================      =================          
TOTAL PORTFOLIO SQUARE FEET     52,028                           6,123                 29,745                 
                                ======                           =====                 ======
 
PERCENT OCCUPIED                 95.09%                          93.44%                 95.39%
                                ======                           =====                 ======     

PRO-FORMA DUKE-WEEKS PORTFOLIO:
1999                             9,390    $ 56,852     11%       1,699    $11,841       5,789   $ 24,200  
2000                             8,199      53,688     11%       1,470     10,431       5,074     22,281  
2001                             8,988      59,784     12%       1,266      9,524       5,627     24,139  
2002                             9,402      63,776     13%       1,358     11,111       5,774     24,446  
2003                             9,454      68,836     14%       1,521     12,823       5,845     26,811  
2004                             4,032      27,795      6%         369      3,273       2,677     11,419  
2005                             5,654      31,282      6%         484      1,105       3,833     12,967  
2006                             3,871      24,170      5%         280      2,308       2,829     10,795  
2007                             4,324      24,747      5%         154      1,683       3,460     13,884  
2008                             4,672      29,574      6%         265      3,399       3,628     14,061  
2009 AND THEREAFTER              7,047      53,936     11%         227      2,272       3,527     14,493  
                                ------------------               ----------------      -----------------  
                                75,033    $494,440    100%       9,093    $69,770      48,063   $199,496
                                ==================               ================      =================   
TOTAL PORTFOLIO SQUARE FEET     80,101                           9,731                 51,449           
                                ======                           =====                 ======               
PERCENT OCCUPIED                 94.03%                          93.59%                 93.90%
                                ======                           =====                 ====== 
</TABLE> 

<TABLE>
<CAPTION>
                                                        OFFICE
                                         -------------------------------------
                                              SUBURBAN              CBD                     RETAIL
                                         ------------------   ----------------      ----------------------
YEAR OF EXPIRATION                        SQUARE               SQUARE                  SQUARE
                                           FEET     DOLLARS     FEET   DOLLARS          FEET      DOLLARS
                                         --------  --------   -------  -------      ----------   ---------
<S>                                       <C>       <C>       <C>     <C>            <C>        <C>
DUKE PORTFOLIO:                                                                         
1999                                      1,444    $ 15,619     62    $  444            109     $ 1,114
2000                                      1,256      15,809     34       242            120       1,464
2001                                      1,779      22,075     89     1,041             92       1,121
2002                                      1,536      17,933    142     1,242            149       1,678
2003                                      1,326      17,660    156     1,948            149       1,617
2004                                        754      10,135      9       110             18         194
2005                                      1,042      14,407     48       497            216       1,846
2006                                        723      10,506     10        84              8         108
2007                                        470       6,771     99     1,057             76         760
2008                                        376       5,008     71     1,040             46         613
2009 AND THEREAFTER                       1,654      22,759    109     1,639          1,206      10,653
                                         ------------------    -------------          ----------------- 
                                         12,360    $158,682    829    $9,344          2,189     $21,168
                                         ==================  ===============          =================
TOTAL PORTFOLIO SQUARE FEET              13,015                861                    2,284
                                         ======              =====                    =====
  
PERCENT OCCUPIED                          94.97%             96.26%                   95.83%
                                         ======              =====                    =====
  
PRO-FORMA DUKE-WEEKS
 PORTFOLIO:
1999                                      1,682    $ 18,826     62    $  444            158       1,541
2000                                      1,450      18,725     34       242            171       2,009
2001                                      1,908      23,859     89     1,041             98       1,221
2002                                      1,976      25,240    142     1,242            152       1,737
2003                                      1,766      25,277    156     1,948            166       1,977
2004                                        952      12,623      9       110             25         370
2005                                      1,068      14,789     48       497            221       1,924
2006                                        740      10,815     10        84             12         168
2007                                        526       7,363     99     1,057             85         760
2008                                        662      10,461     71     1,040             46         613
2009 AND THEREAFTER                       1,707      23,629    109     1,639          1,477      11,903
                                         ------------------    -------------          -----------------    
                                         14,437    $191,607    829    $9,344          2,611     $24,223
                                         ==================  ===============          =================
TOTAL PORTFOLIO SQUARE                   15,311                861                    2,749
                                         ======              =====                    =====
PERCENT OCCUPIED                          94.45%             96.26%                   94.97%
                                         ======              =====                    =====
</TABLE>

                                       11
<PAGE>
 
Duke-Weeks Realty Corporation
Development Backlog Schedule
December 31, 1998
<TABLE> 
<CAPTION> 
<S>                                 <C>             <C>              <C>           <C>          <C>
                                                                                                Estimated
Anticipated                         Number of        Square          Percent       Project      Stabilized
In-Service Date                     Buildings         Feet           Leased         Costs         Return
- -----------------------------------------------------------------------------------------------------------
Duke Portfolio

1st Quarter 1999                           10       2,014,817          50%        $104,830         11.9%
2nd Quarter 1999                           12       2,158,953          37%          91,151         11.3%
3rd Quarter 1999                           10       1,215,020          35%          93,553         11.8%
4th Quarter 1999                            4         819,293          75%          42,063         11.4%
Thereafter                                  4       1,032,881          50%         126,439         10.6%
                                    -----------------------------------------------------------------------            
                                           40       7,240,964          47%        $458,036         11.4%
                                    =======================================================================

Pro-Forma Duke-Weeks Portfolio

1st Quarter 1999                           21       3,222,240          38%       $161,245          11.6%
2nd Quarter 1999                           21       2,933,414          35%        146,717          11.1%
3rd Quarter 1999                           17       2,034,375          36%        154,986          11.4%
4th Quarter 1999                            6       1,100,020          70%         72,991          11.3%
Thereafter                                  6       1,274,061          46%        142,384          10.7%
                                     ----------------------------------------------------------------------
                                           71      10,564,110          41%       $678,323          11.2%
                                     ======================================================================   
</TABLE>

                                       12
<PAGE>
 
Duke-Weeks Realty Corporation
Land Held for Future Development
As of December 31, 1998
<TABLE>
<CAPTION>
                                              Acres
                                     -------------------------  
                                                    Pro-Forma           Major Parks
                                        Duke        Duke-Weeks          -----------
                                     -------------------------  
<S>                                     <C>         <C>                 <C>                                       <C>
                                                                        Lebanon Business Park, Indianapolis       489
Owned                                      1,659        2,274           Hillside, Spartanburg                     336
Joint Venture                                110          558           Groveport, Columbus                       230
Under Agreement                              563          791           Park 100, Indianapolis                    210
Options/Control                              443        1,023           Governor's Pointe, Cincinnati             180
                                      -----------------------           International Tradeport, Jacksonville     178
Total Acres                                2,775        4,646           World Park, Cincinnati                    174
                                      =======================           Emerald Valley, Cleveland                 157
                                                                        Paramount Center, Research Triangle       130
Developable Square Feet (1)           43,000,000   62,600,000           Crossroads, Chicago                       120
                                      =======================           Plainfield Business Park, Indianapolis    111
                                                                        Horizon Association, Atlanta              107
                                                                        Sugarloaf, Atlanta                        102
</TABLE>
(1) Represents estimated square footage of properties which may be developed on
these acres.

                                       13
<PAGE>
 
        [DUKE-WEEKS REALTY CORPORATION ORGANIZATION CHART APPEARS HERE]

                                       14
<PAGE>
 
<TABLE>
<CAPTION>
 
                                                          Market Analysis

 
                                       Dec. 1998             Historic Job Growth /(2)/                Suburban
                                     Unemployment      Past 5          Past 3          Past            Office         Industrial
                                      Rate /(1)/        Years           Years           Year        Vacancy /(3)/    Vacancy /(3)/
                                     ------------      -------         -------        ------        -------------    -------------
<S>                                  <C>               <C>             <C>             <C>           <C>             <C>
Atlanta                                   2.80%        22.84%          11.15%          2.79%            10.40%        11.70%
Chicago                                   4.00%         9.63%           4.63%          1.23%             8.60%         6.40%
Cincinnati                                2.80%        13.78%           8.23%          2.86%           10.50%         4.70%
Cleveland                                 3.90%        10.58%           5.04%          1.97%           10.40%         5.80%
Columbus                                  2.30%        13.70%           2.94%          1.88%            6.60%         8.10%
Dallas                                    2.70%        24.25%          14.66%          3.16%           10.40%         8.00%
Fort Lauderdale                           4.10%        19.17%          10.34%          2.77%            9.00%         5.50%
Indianapolis                              2.40%        12.72%           6.76%          2.63%           10.20%         5.80%
Jacksonville                               n/a         23.22%          11.81%          3.91%            7.90%         6.70%
Miami                                     6.10%         9.63%           6.00%          2.19%           10.70%         6.90%
Minneapolis                               1.60%        13.66%           6.87%          2.45%            5.20%         4.20%
Nashville                                 3.50%        15.86%           6.07%          1.21%            8.60%         7.70%
Orlando                                   2.60%        28.61%          16.77%          4.58%            6.60%         6.30%
Research Triangle                         2.70%        24.23%          12.48%          2.67%             n/a           n/a
St. Louis                                 3.30%         9.19%           4.98%          1.18%            5.90%         4.80%
Tampa                                     2.70%        22.85%          12.69%          4.49%            8.80%         5.10%
National Average                          4.40%        12.96%           7.46%          2.11%            9.10%         7.30%
</TABLE> 

/(1)/ Source - Bureau of Labor Statistics
/(2)/ Source - Regional Financial Associates
/(3)/ Source - Torto-Wheaton Research/CB Richard Ellis as of fourth quarter 1998

                                      15
<PAGE>
 
                         Duke-weeks Realty Corporation

           [MAP OF THE UNITED STATES INDICATING THE MAJOR MARKETS IN 
                   WHICH DUKE AND WEEKS OPERATE APPEARS HERE]

                                       16



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