|                                                                                     |   | Years Ended December 31, |    |
|------------------------------------------------------------------------------------------|--------|--------------------------|---------|
|                                                                                     |   | 2009                     |    | 2008 |   | 2007 |   | 2006 |   | 2005 |   |
| Earnings:                                                                                |   |                     |    |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Income from continuing operations before equity in earnings of unconsolidated affiliates |   | $                        | 32,389  |   | $ | 4,548 |   | $ | 38,992 |   | $ | 26,046 |   | $ | 13,830 |   |
| Fixed charges                                                                            |   |                     | 93,035  |   |   | 108,271 |   |   | 111,397 |   |   | 106,540 |   |   | 110,238 |   |
| Capitalized interest                                                                     |   |                     | (4,555  | ) |   | (8,312 | ) |   | (9,743 | ) |   | (5,002 | ) |   | (2,900 | ) |
| Distributions of earnings from unconsolidated affiliates                                 |   |                     | 4,103   |   |   | 5,978 |   |   | 4,271 |   |   | 7,335 |   |   | 8,516 |   |
| Total earnings                                                                           |   | $                        | 124,972 |   | $ | 110,485 |   | $ | 144,917 |   | $ | 134,919 |   | $ | 129,684 |   |
|                                                                                     |   |                     |    |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Fixed charges and Preferred Unit distributions:                                          |   |                     |    |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Contractual interest expense                                                             |   | $                        | 81,982  |   | $ | 92,858 |   | $ | 93,894 |   | $ | 93,598 |   | $ | 97,431 |   |
| Amortization of deferred financing costs                                                 |   |                     | 2,760   |   |   | 2,716 |   |   | 2,415 |   |   | 2,375 |   |   | 3,372 |   |
| Financing obligations interest expense                                                   |   |                     | 2,130   |   |   | 2,918 |   |   | 3,930 |   |   | 4,162 |   |   | 5,032 |   |
| Capitalized interest                                                                     |   |                     | 4,555   |   |   | 8,312 |   |   | 9,743 |   |   | 5,002 |   |   | 2,900 |   |
| Interest component of rental expense                                                     |   |                     | 1,608   |   |   | 1,467 |   |   | 1,415 |   |   | 1,403 |   |   | 1,503 |   |
| Total fixed charges                                                                      |   |                     | 93,035  |   |   | 108,271 |   |   | 111,397 |   |   | 106,540 |   |   | 110,238 |   |
| Preferred Unit distributions                                                             |   |                     | 6,708   |   |   | 9,804 |   |   | 13,477 |   |   | 17,063 |   |   | 27,238 |   |
| Total fixed charges and Preferred Unit distributions                                     |   | $                        | 99,743  |   | $ | 118,075 |   | $ | 124,874 |   | $ | 123,603 |   | $ | 137,476 |   |
|                                                                                     |   |                     |    |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Ratio of earnings to fixed charges                                                       |   |                     | 1.34    |   |   | 1.02 |   |   | 1.30 |   |   | 1.27 |   |   | 1.18 |   |
| Ratio of earnings to combined fixed charges and Preferred Unit distributions             |   |                     | 1.25    |   |   | 0.94 |   |   | 1.16 |   |   | 1.09 |   |   | 0.94 |   |

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