1
                                                                    Exhibit 12.1


                EXHIBIT 12.1 - STATEMENT RE: COMPUTATION OF RATIO
                      OF EARNINGS TO COMBINED FIXED CHARGES
                     AND RATIO OF EARNINGS TO FIXED CHARGES

          LIBERTY PROPERTY TRUST/LIBERTY PROPERTY LIMITED PARTNERSHIP



                                                                                                                           
                                                             YEAR ENDED            YEAR ENDED            YEAR ENDED        
                                                          DECEMBER 31, 1998     DECEMBER 31, 1997     DECEMBER 31, 1996    
                                                               --------             --------              --------         
                                                                             (Dollars in Thousands)
                                                                                                               
Earnings before fixed charges:                                                                                             
Income (loss) before extraordinary item                        $116,677             $ 66,050              $ 37,631         
Add: Interest expense                                            74,155               46,521                33,967         
     Depreciation expense on cap'd                                                                                         
      interest                                                    1,001                  650                   502         
     Amortization of deferred                                                                                              
      financing costs, net                                        4,462                7,367                 4,561         
                                                               --------             --------              --------         
Earnings before fixed charges                                  $196,295             $120,588              $ 76,661         
                                                               ========             ========              ========         
Fixed charges:                                                                                                             
Interest expense                                                 74,155               46,521                33,967         
Amortization of deferred financing charges                        4,462                4,448                 4,561         
Capitalized interest                                             16,317               11,802                 7,708         
Preferred unit distributions                                     11,000                4,247                    --         
                                                               --------             --------              --------         
Fixed charges                                                  $105,934             $ 67,018              $ 46,236         
                                                               ========             ========              ========         
Ratio of earnings to combined fixed charges                        1.85                 1.80                  1.66         
                                                               ========             ========              ========         
Ratio of earnings to fixed charges                                 2.07                 1.92                  1.66         
                                                               ========             ========              ========         
                                                 
                                                                                   PERIOD FROM    
                                                              YEAR ENDED         JUNE 23, 1994 TO 
                                                           DECEMBER 31, 1995     DECEMBER 31, 1994
                                                               --------              --------     
                                                                  (Dollars in Thousands)
                                                                                         
Earnings before fixed charges:                                                                    
Income (loss) before extraordinary item                        $ 22,309              $ 10,868     
Add: Interest expense                                            32,819                11,326     
     Depreciation expense on cap'd                                                                
      interest                                                      450                   200     
     Amortization of deferred                                                                     
      financing costs, net                                        4,869                 1,250     
                                                               --------              --------     
Earnings before fixed charges                                  $ 60,447              $ 23,644     
                                                               ========              ========     
Fixed charges:                                                                                    
Interest expense                                                 32,819                11,326     
Amortization of deferred financing charges                        4,869                 1,250     
Capitalized interest                                              3,475                   190     
Preferred unit distributions                                         --                    --     
                                                               --------              --------     
Fixed charges                                                  $ 41,163              $ 12,766     
                                                               ========              ========     
Ratio of earnings to combined fixed charges                        1.47                  1.85     
                                                               ========              ========     
Ratio of earnings to fixed charges                                 1.47                  1.85
                                                               ========              ========