<ARTICLE>                     5
                                                                      
                                                                
<PERIOD-TYPE>                          3-MOS                6-MOS
<FISCAL-YEAR-END>                      DEC-31-1998          DEC-31-1998
<PERIOD-START>                         APR-1-1998           JAN-1-1998
<PERIOD-END>                           JUN-30-1998          JUN-30-1998  
<CASH>                                     18,758,000          18,758,000   
<SECURITIES>                               0                   0             
<RECEIVABLES>                              32,422,000          32,422,000     
<ALLOWANCES>                               0                   0            
<INVENTORY>                                0                   0            
<CURRENT-ASSETS>                           64,769,000          64,769,000   
<PP&E>                                     3,463,858,000       3,463,858,000
<DEPRECIATION>                             122,414,000         122,414,000  
<TOTAL-ASSETS>                             3,468,924,000       3,468,924,000
<CURRENT-LIABILITIES>                      69,164,000          69,164,000       
<BONDS>                                    1,408,700,000       1,408,700,000  
<PREFERRED-MANDATORY>                      0                   0             
<PREFERRED>                                397,500,000         397,500,000                         
<COMMON>                                   529,000             529,000                         
<OTHER-SE>                                 1,593,031,000       1,593,031,000 
<TOTAL-LIABILITY-AND-EQUITY>               3,468,924,000       3,468,924,000 
<SALES>                                    113,079,000         213,410,000   
<TOTAL-REVENUES>                           115,641,000         218,129,000   
<CGS>                                      35,827,000          65,555,000    
<TOTAL-COSTS>                              56,167,000          103,056,000   
<OTHER-EXPENSES>                           4,386,000           8,170,000     
<LOSS-PROVISION>                           0                   0             
<INTEREST-EXPENSE>                         17,837,000          35,615,000    
<INCOME-PRETAX>                            30,985,000          59,414,000    
<INCOME-TAX>                               0                   0             
<INCOME-CONTINUING>                        30,985,000          59,414,000    
<DISCONTINUED>                             0                   0             
<EXTRAORDINARY>                            0                   46,000        
<CHANGES>                                  0                   0             
<NET-INCOME>                               23,329,000          45,567,000    
<EPS-PRIMARY>                              .45                 .90           
<EPS-DILUTED>                              .44                 .89