Form: 10-K

Annual report pursuant to Section 13 and 15(d)

March 1, 2010

Exhibit 12.1
AVALONBAY COMMUNITIES, INC.
RATIOS OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED STOCK DIVIDENDS
                                         
    Year     Year     Year     Year     Year  
    Ended     Ended     Ended     Ended     Ended  
    December 31, 2009     December 31, 2008(1)     December 31, 2007(1)     December 31, 2006(1)     December 31, 2005(1)  
Income from continuing operations before cumulative effect of change in accounting principle
  $ 76,413     $ 98,492     $ 219,364     $ 137,306     $ 74,947  
 
                                       
(Plus):
                                       
Equity in income of unconsolidated entities, net of distributions received
    5,475       6,728       9,532       7,478       (4,802 )
Amortization of capitalized interest (2)
    14,035       12,428       9,941       7,503       5,957  
 
                             
 
                                       
Earnings before fixed charges
  $ 95,923     $ 117,648     $ 238,837     $ 152,287     $ 76,102  
 
                             
 
                                       
(Plus) Fixed charges:
                                       
Portion of rents representative of the interest factor
  $ 6,241     $ 5,287     $ 3,165     $ 1,410     $ 1,495  
Interest expense
    150,323       114,910       92,175       103,910       120,670  
Interest capitalized
    48,226       74,621       73,118       46,388       25,284  
Preferred dividend
    —       10,454       8,700       8,700       8,700  
 
                             
 
                                       
Total fixed charges (3)
  $ 204,790     $ 205,272     $ 177,158     $ 160,408     $ 156,149  
 
                             
(Less):
                                       
Interest capitalized
    48,226       74,621       73,118       46,388       25,284  
Preferred dividend
    —       10,454       8,700       8,700       8,700  
 
                             
 
                                       
Earnings (4)
  $ 252,487     $ 237,845     $ 334,177     $ 257,607     $ 198,267  
 
                             
 
                                       
Ratio (4 divided by 3)
    1.23       1.16       1.89       1.61       1.27  
 
                             
AVALONBAY COMMUNITIES, INC.
RATIOS OF EARNINGS TO FIXED CHARGES
                                         
    Year     Year     Year     Year     Year  
    Ended     Ended     Ended     Ended     Ended  
    December 31, 2009     December 31, 2008(1)     December 31, 2007(1)     20 December 31, 2006(1)     December 31, 2005(1)  
Income from continuing operations before cumulative effect of change in accounting principle
  $ 76,413     $ 98,492     $ 219,364     $ 137,306     $ 74,947  
 
                                       
(Plus):
                                       
Equity in income of unconsolidated entities, net of distributions received
    5,475       6,728       9,532       7,478       (4,802
Amortization of capitalized interest (2)
    14,035       12,428       9,941       7,503       5,957  
 
                             
 
                                       
Earnings before fixed charges
  $ 95,923     $ 117,648     $ 238,837     $ 152,287     $ 76,102  
 
                             
 
                                       
(Plus) Fixed charges:
                                       
Portion of rents representative of the interest factor
  $ 6,241     $ 5,287     $ 3,165     $ 1,410     $ 1,495  
Interest expense
    150,323       114,910       92,175       103,910       120,670  
Interest capitalized
    48,226       74,621       73,118       46,388       25,284  
 
                             
 
                                       
Total fixed charges (3)
  $ 204,790     $ 194,818     $ 168,458     $ 151,708     $ 147,449  
 
                             
 
                                       
(Less):
                                       
Interest capitalized
    48,226       74,621       73,118       46,388       25,284  
 
                             
 
                                       
Earnings (4)
  $ 252,487     $ 237,845     $ 334,177     $ 257,607     $ 198,267  
 
                             
 
                                       
Ratio (4 divided by 3)
    1.23       1.22       1.98       1.70       1.34  
 
                             
 
(1)   The results of operations for 2005 through 2009 have been adjusted to reflect discontinued operations for properties sold or held for sale as of December 31, 2009.
 
(2)   Represents an estimate of capitalized interest costs based on the Company’s established depreciation policy and an analysis of interest costs capitalized since 1998 (the year in which AvalonBay was formed).