Exhibit 99.1

SELECTED QUARTERLY FINANCIAL INFORMATION

(Unaudited)

Selected quarterly information for the years ended December 31, 2010 and 2009 is as follows (in thousands, except per unit amounts):



|                                                                |  |               |         |   |              |   |          |         |  |   |          |      |  |   |         |  
|--------------------------------------------------------------- |  | ------------- | ------- | - | ------------ | - | -------- | ------- |  | - | -------- | ---- |  | - | ------- | -
|                                                                |  | Quarter Ended |        
|2010                                                            |  | December 31   |         |   | September 30 |   |          | June 30 |  |   | March 31 |     
|Rental and related revenue                                      |  | $             | 228,868 |   |              | $ | 230,781  |         |  | $ | 206,351  |      |  | $ | 212,242 |  
|General contractor and service fee revenue                      |  |               | 100,971 |   |              |   | 132,351  |         |  |   | 168,398  |      |  |   | 113,641 |  
|Net income (loss) attributable to common unitholders            |  | $             | 9,752   |   |              | $ | 35,105   |         |  | $ | (43,603  | )    |  | $ | (15,713 | )
|Basic income (loss) per Common Unit                             |  | $             | 0.04    |   |              | $ | 0.13     |         |  | $ | (0.19    | )    |  | $ | (0.07   | )
|Diluted income (loss) per Common Unit                           |  | $             | 0.04    |   |              | $ | 0.13     |         |  | $ | (0.19    | )    |  | $ | (0.07   | )
|Weighted average Common Units                                   |  |               | 257,420 |   |              |   | 257,383  |         |  |   | 233,486  |      |  |   | 230,760 |  
|Weighted average Common Units and potential dilutive securities |  |               | 257,420 |   |              |   | 257,383  |         |  |   | 233,486  |      |  |   | 230,760 |  
|                                                                |  |               |         |  
|2009                                                            |  | December 31   |         |   | September 30 |   |          | June 30 |  |   | March 31 |     
|Rental and related revenue                                      |  | $             | 213,542 |   |              | $ | 210,935  |         |  | $ | 210,316  |      |  | $ | 207,438 |  
|General contractor and service fee revenue                      |  |               | 114,097 |   |              |   | 100,880  |         |  |   | 129,444  |      |  |   | 105,088 |  
|Net income (loss) attributable to common unitholders            |  | $             | (3,122  | ) |              | $ | (332,428 | )(1)    |  | $ | (33,457  | )(2) |  | $ | 24,307  |  
|Basic income (loss) per Common Unit                             |  | $             | (0.02   | ) |              | $ | (1.44    | )       |  | $ | (0.16    | )    |  | $ | 0.15    |  
|Diluted income (loss) per Common Unit                           |  | $             | (0.02   | ) |              | $ | (1.44    | )       |  | $ | (0.16    | )    |  | $ | 0.15    |  
|Weighted average Common Units                                   |  |               | 230,629 |   |              |   | 230,599  |         |  |   | 214,015  |      |  |   | 155,254 |  
|Weighted average Common Units and potential dilutive securities |  |               | 230,629 |   |              |   | 230,599  |         |  |   | 214,015  |      |  |   | 155,747 |  



|(1) | Amount includes $284.8 million of non-cash impairment charges.
|--- | --------------------------------------------------------------



|(2) | Amount includes $17.7 million of non-cash impairment charges.
|--- | -------------------------------------------------------------