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Segment Information (Tables) | 9 Months Ended
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Sep. 30, 2012
Segment Reporting [Abstract] |
Segment information |
| Pennsylvania Suburbs |  | Philadelphia CBD |  | Metropolitan, D.C. |  | New Jersey/Delaware |  | Richmond, Virginia |  | Austin, Texas |  | California |  | Corporate |  | Total
As of September 30, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating properties | $ | 1,174,597 |  |  | $ | 962,235 |  |  | $ | 1,189,014 |  |  | $ | 545,104 |  |  | $ | 308,371 |  |  | $ | 259,304 |  |  | $ | 221,664 |  |  | $ | — |  |  | $ | 4,660,289 |
Construction-in-progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,449 |  |  | 43,449 |
Land inventory |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 95,500 |  |  | 95,500 |
As of December 31, 2011: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate investments, at cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating properties | $ | 1,218,071 |  |  | $ | 953,870 |  |  | $ | 1,255,803 |  |  | $ | 545,657 |  |  | $ | 307,698 |  |  | $ | 257,694 |  |  | $ | 254,287 |  |  | $ | — |  |  | $ | 4,793,080 |
Construction-in-progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,083 |  |  | 25,083 |
Land inventory |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 109,008 |  |  | 109,008 |
For the three-months ended September 30, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ | 38,526 |  |  | $ | 33,025 |  |  | $ | 26,516 |  |  | $ | 20,553 |  |  | $ | 8,826 |  |  | $ | 8,275 |  |  | $ | 5,141 |  |  | $ | (479 | ) |  | $ | 140,383 |
Property operating expenses, real estate taxes and third party management expenses | 13,588 |  |  | 12,431 |  |  | 10,637 |  |  | 10,030 |  |  | 3,762 |  |  | 3,484 |  |  | 2,639 |  |  | (504 | ) |  | 56,067 |
Net operating income | $ | 24,938 |  |  | $ | 20,594 |  |  | $ | 15,879 |  |  | $ | 10,523 |  |  | $ | 5,064 |  |  | $ | 4,791 |  |  | $ | 2,502 |  |  | $ | 25 |  |  | $ | 84,316 |
For the three-months ended September 30, 2011: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ | 36,812 |  |  | $ | 31,097 |  |  | $ | 29,296 |  |  | $ | 20,743 |  |  | $ | 9,334 |  |  | $ | 7,453 |  |  | $ | 4,968 |  |  | $ | (302 | ) |  | $ | 139,401 |
Property operating expenses, real estate taxes and third party management expenses | 13,493 |  |  | 11,539 |  |  | 10,868 |  |  | 10,008 |  |  | 3,664 |  |  | 3,233 |  |  | 3,009 |  |  | (443 | ) |  | 55,371 |
Net operating income | $ | 23,319 |  |  | $ | 19,558 |  |  | $ | 18,428 |  |  | $ | 10,735 |  |  | $ | 5,670 |  |  | $ | 4,220 |  |  | $ | 1,959 |  |  | $ | 141 |  |  | $ | 84,030 |
For the nine-months ended September 30, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ | 113,565 |  |  | $ | 98,086 |  |  | $ | 79,919 |  |  | $ | 61,442 |  |  | $ | 26,762 |  |  | $ | 23,959 |  |  | $ | 14,942 |  |  | $ | (1,305 | ) |  | $ | 417,370 |
Property operating expenses, real estate taxes and third party management expenses | 39,643 |  |  | 37,082 |  |  | 31,158 |  |  | 28,697 |  |  | 10,875 |  |  | 10,497 |  |  | 7,498 |  |  | (1,278 | ) |  | 164,172 |
Net operating income | $ | 73,922 |  |  | $ | 61,004 |  |  | $ | 48,761 |  |  | $ | 32,745 |  |  | $ | 15,887 |  |  | $ | 13,462 |  |  | $ | 7,444 |  |  | $ | (27 | ) |  | $ | 253,198 |
For the nine-months ended September 30, 2011: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ | 111,949 |  |  | $ | 93,520 |  |  | $ | 89,936 |  |  | $ | 60,554 |  |  | $ | 27,409 |  |  | $ | 23,203 |  |  | $ | 14,551 |  |  | $ | (855 | ) |  | $ | 420,267 |
Property operating expenses, real estate taxes and third party management expenses | 42,112 |  |  | 34,962 |  |  | 34,002 |  |  | 30,611 |  |  | 10,666 |  |  | 9,740 |  |  | 8,015 |  |  | (991 | ) |  | 169,117 |
Net operating income | $ | 69,837 |  |  | $ | 58,558 |  |  | $ | 55,934 |  |  | $ | 29,943 |  |  | $ | 16,743 |  |  | $ | 13,463 |  |  | $ | 6,536 |  |  | $ | 136 |  |  | $ | 251,150 |
Reconciliation of consolidated net operating income |
| Three-month periods ended September 30, |  | Nine-month periods ended September 30,
| 2012 |  | 2011 |  | 2012 |  | 2011
| (amounts in thousands) |  | (amounts in thousands)
Consolidated net operating income | $ | 84,316 |  |  | $ | 84,030 |  |  | $ | 253,198 |  |  | $ | 251,150 |
Less: |  |  |  |  |  |  |
Interest expense | (32,620 | ) |  | (32,346 | ) |  | (99,745 | ) |  | (99,477 | )
Deferred financing costs | (1,218 | ) |  | (1,846 | ) |  | (3,790 | ) |  | (3,844 | )
Depreciation and amortization | (48,738 | ) |  | (51,943 | ) |  | (147,618 | ) |  | (157,157 | )
Administrative expenses | (6,080 | ) |  | (6,177 | ) |  | (18,209 | ) |  | (18,311 | )
Plus: |  |  |  |  |  |  |
Interest income | 311 |  |  | 523 |  |  | 2,635 |  |  | 1,385 |
Historic tax credit transaction income | 11,840 |  |  | 12,026 |  |  | 11,840 |  |  | 12,026 |
Interest expense - financing obligation | (230 | ) |  | — |  |  | (608 | ) |  | — |
Equity in income of real estate ventures | 500 |  |  | 418 |  |  | 1,382 |  |  | 2,739 |
Net gain on sales of interests in real estate | — |  |  | — |  |  | — |  |  | 2,791 |
Loss on real estate venture formation | (950 | ) |  | — |  |  | (950 | ) |  | — |
Gain (loss) on early extinguishment of debt | (51 | ) |  | 176 |  |  | (1,549 | ) |  | (580 | )
Income (loss) from continuing operations | 7,080 |  |  | 4,861 |  |  | (3,414 | ) |  | (9,278 | )
Income from discontinued operations | 10,009 |  |  | 1,750 |  |  | 36,641 |  |  | 9,165 |
Net income (loss) | $ | 17,089 |  |  | $ | 6,611 |  |  | $ | 33,227 |  |  | $ | (113 | )

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