1
                                                                    EXHIBIT 99

 
                             POST PROPERTIES, INC.
 
                  BASIS OF PRESENTATION TO UNAUDITED PRO FORMA
                             COMBINED BALANCE SHEET
                               SEPTEMBER 30, 1997
 
     The Post Properties, Inc. Unaudited Pro Forma Combined Balance Sheet gives
effect to the Merger of Post and Columbus as if the Merger had occurred on
September 30, 1997. The Unaudited Pro Forma Combined Balance Sheet gives effect
to the Merger under the "purchase" method of accounting in accordance with
Accounting Principles Board Opinion No. 16. In the opinion of management, all
significant adjustments necessary to reflect the effects of the Merger have been
made.
 
     The Unaudited Pro Forma Combined Balance Sheet is presented for comparative
purposes only and is not necessarily indicative of what the actual combined
financial position of Post and Columbus would have been at September 30, 1997,
nor does it purport to represent the future combined financial position of Post
and Columbus. This Post Properties, Inc. Unaudited Pro Forma Combined Balance
Sheet should be read in conjunction with, and is qualified in its entirety by,
the respective historical financial statements and notes thereto of Post and
Columbus.
 

   2
 
                             POST PROPERTIES, INC.
 
                   UNAUDITED PRO FORMA COMBINED BALANCE SHEET
                               SEPTEMBER 30, 1997
 


                                                                               PRO FORMA
                                                 POST          COLUMBUS          MERGER        PRO FORMA
                                             HISTORICAL(A)   HISTORICAL(A)   ADJUSTMENTS(B)     COMBINED
                                             -------------   -------------   --------------    ----------
                                                                    (IN THOUSANDS)
                                                                                   
                                                 ASSETS
Real estate assets
  Land.....................................   $  151,041       $ 47,588         $ 20,982(C)    $  219,611
  Building and improvements................      747,715        349,530          146,117(C)     1,243,362
  Furniture, fixtures and equipment........       79,236          5,099                            84,335
  Construction in progress (includes land
     on properties under development)......      243,547         87,715           13,157(C)       344,419
  Land held for future development.........        7,108             --                             7,108
                                              ----------       --------         --------       ----------
                                               1,228,647        489,932          180,256        1,898,835
  Less: accumulated depreciation...........     (191,632)       (49,898)                         (241,530)
                                              ----------       --------         --------       ----------
  Real estate held for investment..........    1,037,015        440,034          180,256        1,657,305
  Cash and cash equivalents................        2,619          2,240                             4,859
  Restricted cash..........................        1,441            477                             1,918
  Deferred charges, net....................       10,693          1,200              552 (D)       12,445
  Other assets.............................       11,373         18,174           (2,218)(E)       27,329
                                              ----------       --------         --------       ----------
          Total assets.....................   $1,063,141       $462,125         $178,590       $1,703,856
                                              ==========       ========         ========       ==========
 
                                  LIABILITIES AND SHAREHOLDERS' EQUITY
Notes payable..............................   $  510,637       $259,588         $ 22,486(F)    $  792,711
Accrued interest payable...................        8,643            408                             9,051
Dividend and distribution payable..........       16,270             --                            16,270
Accounts payable and accrued expenses......       37,087         15,690                            52,777
Security deposits and prepaid rents........        5,177          2,348                             7,525
Other liabilities..........................           --          2,063                             2,063
                                              ----------       --------         --------       ----------
          Total liabilities................      577,814        280,097           22,486          880,397
                                              ----------       --------         --------       ----------
Minority interest of unitholders in
  Operating Partnership....................       83,325             --           29,629(G)       112,954
                                              ----------       --------         --------       ----------
Shareholders' equity
  Preferred stock..........................           10             --                                10
  Common stock.............................          221            134              (50)(H)          305
  Additional paid-in capital.................    401,771        214,647           93,772(I)       710,190
  Accumulated earnings(deficit)..............         --        (32,733)          32,733(J)             -
  Treasury stock.............................         --            (20)              20(J)             -
                                              ----------       --------         --------       ----------
          Total shareholders' equity.......      402,002        182,028          126,475          710,505
                                              ----------       --------         --------       ----------
          Total liabilities and
            shareholders' equity...........   $1,063,141       $462,125         $178,590       $1,703,856
                                              ==========       ========         ========       ==========

 

   3
 
                             POST PROPERTIES, INC.
                                        
                  BASIS OF PRESENTATION TO UNAUDITED PRO FORMA
                       COMBINED STATEMENTS OF OPERATIONS
                 FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997
                     AND THE YEAR ENDED DECEMBER 31, 1996
                                        
     The Post Properties, Inc. Unaudited Pro Forma Combined Statements of
Operations for the nine months ended September 30, 1997 and the year ended
December 31, 1996 are presented as if the Merger had occurred on January 1,
1996. The Post Properties, Inc. Unaudited Pro Forma Combined Statements of
Operations give effect to the Merger under the "purchase" method of accounting
in accordance with Accounting Principles Board Opinion No. 16. and assumes that
the combined entity qualifying as a REIT distributing at least 95% of its
taxable income, and therefore, incurring no federal income tax liability for the
year. In the opinion of management, all significant adjustments necessary to
reflect the effects of these transactions have been made.
 
     The Post Properties, Inc. Unaudited Pro Forma Combined Statements of
Operations are presented for comparative purposes only and are not necessarily
indicative of what the actual combined results of Post and Columbus would have
been for the nine months ended September 30, 1997 and the year ended December
31, 1996, nor do they purport to be indicative of the results of operations in
future periods. The Post Properties, Inc. Unaudited Pro Forma Combined
Statements of Operations should be read in conjunction with, and are qualified
in their entirety by, the respective historical financial statements and notes
thereto of Post and Columbus. 
   4
 
                             POST PROPERTIES, INC.
 
             UNAUDITED PRO FORMA COMBINED STATEMENTS OF OPERATIONS
                      NINE MONTHS ENDED SEPTEMBER 30, 1997
 


                                              POST           COLUMBUS         MERGER        PRO FORMA
                                          HISTORICAL(K)    HISTORICAL(K)    ADJUSTMENTS     COMBINED
                                          -------------    -------------    -----------    -----------
                                                 (IN THOUSANDS EXCEPT SHARE AND PER SHARE DATA)
                                                                               
Revenues:
  Rental................................   $  127,988       $   41,591                     $   169,579
  Property management - third party.....        1,696              109                           1,805
  Landscape services - third party......        3,792               --                           3,792
  Interest..............................           30              299                             329
  Other.................................        4,688            1,851                           6,539
                                           ----------       ----------      ----------     -----------
          Total revenues................      138,194           43,850               -         182,044
                                           ----------       ----------      ----------     -----------
Expenses:
  Property operating and maintenance
     (exclusive of items shown
     separately below)..................       47,366           14,611                          61,977
  Depreciation (real estate assets).....       18,897            9,361             300(L)       28,558
  Depreciation (non-real estate
     assets)............................          758              221                             979
  Property management - third party.....        1,302               --                           1,302
  Landscape services - third party......        3,117               --                           3,117
  Interest..............................       16,722            7,995          (1,054)(M)      23,663
  Amortization of deferred loan costs...          747              392            (295)(N)         844
  General and administrative............        4,900            1,945          (1,087)(O)       5,758
                                           ----------       ----------      ----------     -----------
          Total expenses................       93,809           34,525          (2,136)        126,198
                                           ----------       ----------      ----------     -----------
  Income before net gain on sale of
     assets, minority interest of
     unitholders in Operating
     Partnership and extraordinary
     item...............................       44,385            9,325           2,136          55,846
  Net gain on sale of assets............        3,512              888                           4,400
  Merger Costs..........................            -             (595)            595 (P)           -
  Minority interest of unitholders in
     Operating Partnership..............       (8,562)               -             310 (Q)      (8,252)
                                           ----------       ----------      ----------     -----------
  Net income before extraordinary
     item...............................       39,335            9,618           3,041          51,994
  Dividend to preferred shareholders....       (3,187)              --                          (3,187)
                                           ----------       ----------      ----------     -----------
  Net income available to common
     shareholders before extraordinary
     item...............................   $   36,148       $    9,618      $    3,041     $    48,807
                                           ==========       ==========      ==========     ===========
Per common share data - basic:
  Weighted average common shares
     outstanding -- ....................   22,032,237                                       30,304,322
                                           ==========                                      ===========
  Net income available to common
     shareholders before extraordinary
     item...............................   $     1.64                                      $      1.61
                                           ==========                                      ===========
Per common share data - diluted:
  Weighted average common shares
     outstanding -- ....................   22,213,618                                       30,763,549
                                           ==========                                       ==========
  Net income available to common
     shareholders before extraordinary
     item...............................   $     1.63                                      $      1.59
                                           ==========                                      ===========
                                           

 

   5
 
                             POST PROPERTIES, INC.
 
             UNAUDITED PRO FORMA COMBINED STATEMENTS OF OPERATIONS
                          YEAR ENDED DECEMBER 31, 1996
 


                                            POST           COLUMBUS          MERGER         PRO FORMA
                                        HISTORICAL(K)    HISTORICAL(K)     ADJUSTMENTS       COMBINED
                                        -------------    -------------     -----------      ----------
                                                (IN THOUSANDS EXCEPT SHARE AND PER SHARE DATA)
                                                                                
Revenues:
  Rental..............................   $  157,735       $   45,910                        $  203,645
  Property management - third party...        2,828              298                             3,126
  Landscape services - third party....        4,834                -                             4,834
  Interest............................          326              228                               554
  Other...............................        4,985            2,094                             7,079
                                         ----------       ----------       ----------       ----------
          Total revenues..............      170,708           48,530               --          219,238
                                         ----------       ----------       ----------       ----------
Expenses:
  Property operating and maintenance
     (exclusive of items shown
     separately below)................       57,335           16,365                            73,700
  Depreciation (real estate assets)...       22,676           10,257            2,624(L)        35,557
  Depreciation (non-real estate
     assets)..........................          927              346                             1,273
  Property management - third party...        2,055                -                             2,055
  Landscape services - third party....        3,917                -                             3,917
  Interest............................       22,131            7,884             (282)(M)       29,733
  Amortization of deferred loan
     costs............................        1,352              393             (285)(N)        1,460
  General and administrative..........        7,716            2,073           (1,450)(O)        8,339
                                         ----------       ----------       ----------       ----------
          Total expenses..............      118,109           37,318              607          156,034
                                         ----------       ----------       ----------       ----------
  Income before net gain on sale of
     assets, minority interest of
     unitholders in Operation
     Partnership and extraordinary
     item.............................       52,599           11,212             (607)          63,204
  Net gain on sale of assets..........          854              246                             1,100
  Minority interest of unitholders in
     Operating Partnership............       (9,984)              --              836(Q)        (9,148)
                                         ----------       ----------       ----------       ----------
  Net income before extraordinary
     item.............................       43,469           11,458              229           55,156
  Dividend to preferred
     shareholders.....................       (1,063)               -                            (1,063)
                                         ----------       ----------       ----------       ----------
  Net income available to common
     shareholders before extraordinary
     item.............................   $   42,406       $   11,458       $      229       $   54,093
                                         ==========       ==========       ==========       ==========
Per common share data - basic:
  Weighted average common shares
     outstanding......................   21,787,648                                         30,227,494
                                         ==========                                         ==========
  Net income available to common
     shareholders before extraordinary
     item.............................   $     1.95                                         $     1.79
                                         ==========                                         ==========
Per common share data - diluted                                                            
  Weighted average common shares                                                           
     outstanding......................   21,879,248                                         30,596,940
                                         ==========                                         ==========
  Net income available to common                                                           
     shareholders before extraordinary                                                     
     item.............................   $     1.94                                         $     1.77
                                         ==========                                         ==========

 

   6
 
                             POST PROPERTIES, INC.
 
                          NOTES TO UNAUDITED PRO FORMA
                   BALANCE SHEET AND STATEMENTS OF OPERATIONS
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
(A)  Represents the respective historical balance sheet of Post and Columbus as
     of September 30, 1997. Certain reclassifications have been made to
     Columbus' historical balance sheet to conform to Post's balance sheet
     presentation.
 
(B)  Represents adjustments to record the Merger in accordance with the purchase
     method of accounting, based upon the assumed purchase price of $640,715
     assuming a market value of $40.09 per share of Post's Common Stock, as
     follows:
 

                                                           
Issuance of 8,440 shares of Post Common Stock based on the
  0.615 exchange for 13,724 Columbus Common Shares, which
  includes 260 Columbus Common Shares issued immediately
  prior to the Merger.......................................  $338,332
Assumption of Columbus' liabilities (including $2,040 of
  purchase adjustments).....................................   282,137
Merger costs (see calculation below)........................    20,246
                                                              --------
                                                              $640,715
                                                              ========

 
     The following is a calculation of the estimated fees and other expenses
     related to the Merger:
 

                                                           
Buyout of employment agreements.............................  $ 8,614
Advisory fees...............................................    7,761
Legal and accounting fees...................................    2,437
Other, including printing, filing and transfer costs........    1,434
                                                              -------
          Total.............................................  $20,246
                                                              =======

 
(C)  Represents the estimated increase in Columbus' real estate assets, net
     based upon Post's purchase price and the adjustment to eliminate the basis
     of Columbus' net assets acquired:
 

                                                           
Purchase Price (see Note B).................................  $640,715
  Less: Historical basis of Columbus' net assets acquired
     Real estate assets.....................................  (440,034)
     Other assets, net of purchase adjustments..............   (20,425)
                                                              --------
Step-up to record fair value of Columbus' real estate
  assets....................................................  $180,256
                                                              ========

 
     The allocation to land and building and improvements to record the step-up
     was based upon relative fair values of Columbus' real estate assets.
 
(D)  Increase due to estimated loan costs incurred to refinance Columbus' debt
     ($1,346) net of elimination of Columbus' historical deferred loan costs
     ($794).
 
(E)  Decrease due to recognition of historical deferred compensation expense
     upon vesting of certain options of Columbus prior to the Merger.
 
(F)  Increase to notes payable reflects the financing of the following:
 

                                                           
Transaction costs...........................................  $20,246
Loan costs on refinanced debt...............................    1,346
Prepayment penalties on existing debt.......................      694
Registration costs..........................................      200
                                                              -------
                                                              $22,486
                                                              =======

 

   7
 
                             POST PROPERTIES, INC.
 
                  NOTES TO UNAUDITED PRO FORMA -- (CONTINUED)
                   BALANCE SHEET AND STATEMENTS OF OPERATIONS
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
(G)  The pro forma allocation to the Minority Interest in Operating Partnership
     is based upon the percentage owned by such Minority Interest as follows:
 

                                                           
Total Shareholders' Equity and Minority Interest in
  Operating Partnership.....................................  $823,459
Less: Equity related to Post's Preferred Stock..............  (48,613)
                                                              --------
                                                               774,846
Minority Interest percentage ownership in Operating
  Partnership (see Note I)..................................      14.6%
                                                              --------
Pro Forma Combined Minority Interest ownership in Operating
  Partnership...............................................   112,954
Post historical Minority Interest ownership in Operating
  Partnership...............................................   (83,325)
                                                              --------
Adjustment to Minority Interest ownership in Operating
  Partnership...............................................  $ 29,629
                                                              ========

 
(H)  Decrease results from elimination of Columbus Common Shares at $.01 par
     value ($134) net of the issuance of Post Common Stock at $.01 par value
     ($84) (see Note I).
 
(I)  Increase to paid-in capital to reflect the following:
 

                                                           
Issuance of 8,440 shares of Post Common Stock at $40.09 per
  share.....................................................  $ 338,332
  Less: Par value of Common Stock issued....................        (84)
        Registration costs incurred in connection with the
        Merger..............................................       (200)
        Columbus' historical paid in capital...............    (214,647)
        Adjustment to Minority Interest in Operating
         Partnership (see Note G)...........................    (29,629)
                                                              ---------
                                                              $  93,772
                                                              =========

 
     The Minority Interest ownership in Post, is calculated as follows:
 


                                                            SHARES   UNITS
                                                            ------   -----
                                                               
Columbus' historical Common Shares outstanding............  13,724           
                                                            ======           
Post Common Stock to be issued based on the .615 Merger
  exchange ratio..........................................   8,440
Post's historical Common Stock/Units outstanding..........  22,128   5,216
                                                            ------   -----
Post's pro forma Common Stock/Units outstanding...........  30,568   5,216
                                                            ======   =====
Post's ownership percentage of the Operating
  Partnership.............................................    85.4%
                                                            ======
Minority Interest ownership percentage of the Operating
  Partnership.............................................    14.6%
                                                            ======

 
(J)  Reflects the elimination of Columbus' distribution in excess of accumulated
     earnings and treasury stock to paid in capital, as a result of the Merger.
 
(K)  Represents the respective historical statement of operations of Post and
     Columbus for the period indicated. Certain reclassifications have been made
     to Columbus' Historical Statement of Operations to conform to Post's
     Statement of Operations presentation.
 

   8
 
                             POST PROPERTIES, INC.
 
                  NOTES TO UNAUDITED PRO FORMA -- (CONTINUED)
                   BALANCE SHEET AND STATEMENTS OF OPERATIONS
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
(L)  Represents the net increase in depreciation of real estate owned as a
     result of recording Columbus' real estate assets at fair value versus
     historical cost. Depreciation is computed on a straight-line basis over the
     estimated useful lives of the related assets which have a useful life of
     approximately 35 years.
 
     The calculation of the fair value of depreciable real estate assets at
     September 30, 1997 is as follows:
 

                                                           
Historical basis of Columbus' real estate property, net.....  $440,034
Plus: Step up to Columbus' real estate property, net (see
  Note C)...................................................   180,256
                                                              --------
Pro forma basis of Columbus' real estate property at fair
  value.....................................................   620,290
Less: Fair value allocated to land..........................   (68,570)
      Construction in progress..............................  (100,871)
                                                              --------
Pro forma basis of Columbus' depreciable real estate
  property at fair value....................................  $450,849
                                                              ========

 
     Calculation of depreciation of real estate property for the nine months
     ended September 30, 1997:
 

                                                           
Depreciation expense based upon an estimated useful life of
  approximately 35 years....................................  $ 9,661
Less: Historic Columbus depreciation of real estate
  property..................................................   (9,361)
                                                              -------
Pro forma adjustment........................................  $   300
                                                              =======

 
     Calculation of depreciation of real estate property for the year ended
     December 31, 1996 is as follows:
 

                                                           
Depreciation expense based upon an estimated useful like of
  approximately 35 years....................................  $12,881
Less: Historic Columbus depreciation of real estate
  property..................................................  (10,257)
                                                              -------
Pro forma adjustment........................................  $ 2,624
                                                              =======

 
(M)  Decrease results from refinancing of Columbus' debt at lower interest
     rates.
 
(N)  Decrease results from the elimination of amortization of Columbus' deferred
     financing costs, which costs would be eliminated in connection with the
     Merger, net of estimated amortization of deferred financing costs for
     refinanced debt.
 
(O)  Decrease results from identified historical costs of certain items which
     will be eliminated or reduced as a result of the Merger as follows:
 

                                                           
Duplication of public company expenses......................  $  650
Reduction in salaries and benefits..........................     600
Other.......................................................     200
                                                              ------
          Annual total......................................  $1,450
                                                              ======


(P)  Reflects the elimination of merger costs reflected in Columbus' statement
     of operations for the nine months ended September 30, 1997.

(Q)  A portion of income was allocated to Minority Interest representing
     interests in the Operating Partnership not owned by Post. The pro forma
     allocation to Minority Interest is based upon the percentage estimated to
     be owned by such Minority Interests as a result of the pro forma
     transactions.