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Segment Reporting (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 518,240 | $ 516,211 | $ 502,307 | $ 508,498 | $ 480,840 | $ 475,360 | $ 457,459 | $ 442,367 | $ 2,045,255 | $ 1,856,028 | $ 1,685,061
NOI |  |  |  |  |  |  |  |  | $ 1,410,697 | $ 1,240,992 | $ 1,099,587
% NOI change from prior year (percent) |  |  |  |  |  |  |  |  | 13.70% | 12.90% | 16.50%
Gross real estate | 20,755,780 |  |  |  | 19,228,571 |  |  |  | $ 20,755,780 | $ 19,228,571 | $ 17,603,867
Gross real estate assets held for sale | 20,846 |  |  |  | 39,528 |  |  |  | 20,846 | 39,528 | 245,449
Gain on Business Interruption Insurance Recovery |  |  |  |  |  |  |  |  | 20,564 | 1,509 | 2,494
Established |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Real estate capitalized additions | 85,676 |  |  |  | 74,982 |  |  |  | 85,676 | 74,982 | 52,635
Operating segment | Established |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 1,542,435 | 1,347,143 | 908,821
NOI |  |  |  |  |  |  |  |  | $ 1,084,351 | $ 950,099 | $ 638,231
% NOI change from prior year (percent) |  |  |  |  |  |  |  |  | 4.80% | 5.90% | 3.60%
Gross real estate | 13,511,377 |  |  |  | 12,391,586 |  |  |  | $ 13,511,377 | $ 12,391,586 | $ 7,360,944
Operating segment | Established | New England |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 239,201 | 182,366 | 164,181
NOI |  |  |  |  |  |  |  |  | $ 153,669 | $ 114,717 | $ 104,674
% NOI change from prior year (percent) |  |  |  |  |  |  |  |  | 4.90% | 2.70% | 0.80%
Gross real estate | 1,888,524 |  |  |  | 1,460,746 |  |  |  | $ 1,888,524 | $ 1,460,746 | $ 1,333,854
Operating segment | Established | Metro NY/NJ |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 379,151 | 361,902 | 285,641
NOI |  |  |  |  |  |  |  |  | $ 258,950 | $ 256,907 | $ 203,522
% NOI change from prior year (percent) |  |  |  |  |  |  |  |  | 1.40% | 3.40% | 3.30%
Gross real estate | 3,212,220 |  |  |  | 3,152,361 |  |  |  | $ 3,212,220 | $ 3,152,361 | $ 2,251,697
Operating segment | Established | Mid-Atlantic |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 233,711 | 209,013 | 98,590
NOI |  |  |  |  |  |  |  |  | $ 162,243 | $ 145,497 | $ 69,498
% NOI change from prior year (percent) |  |  |  |  |  |  |  |  | 1.30% | 0.20% | (2.50%)
Gross real estate | 2,339,395 |  |  |  | 2,177,823 |  |  |  | $ 2,339,395 | $ 2,177,823 | $ 647,374
Operating segment | Established | Pacific Northwest |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 79,684 | 67,900 | 46,041
NOI |  |  |  |  |  |  |  |  | $ 57,494 | $ 48,833 | $ 32,012
% NOI change from prior year (percent) |  |  |  |  |  |  |  |  | 6.50% | 8.50% | 6.80%
Gross real estate | 737,289 |  |  |  | 721,040 |  |  |  | $ 737,289 | $ 721,040 | $ 500,247
Operating segment | Established | Northern California |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 319,121 | 273,432 | 174,527
NOI |  |  |  |  |  |  |  |  | $ 244,458 | $ 210,226 | $ 132,899
% NOI change from prior year (percent) |  |  |  |  |  |  |  |  | 7.00% | 11.90% | 8.20%
Gross real estate | 2,661,258 |  |  |  | 2,414,184 |  |  |  | $ 2,661,258 | $ 2,414,184 | $ 1,402,444
Operating segment | Established | Southern California |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 291,567 | 252,530 | 139,841
NOI |  |  |  |  |  |  |  |  | $ 207,537 | $ 173,919 | $ 95,626
% NOI change from prior year (percent) |  |  |  |  |  |  |  |  | 9.10% | 9.40% | 5.20%
Gross real estate | 2,672,691 |  |  |  | 2,465,432 |  |  |  | $ 2,672,691 | $ 2,465,432 | $ 1,225,328
Operating segment | Other Stabilized |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 235,360 | 221,042 | 497,634
NOI |  |  |  |  |  |  |  |  | 165,530 | 145,263 | 343,477
Gross real estate | 2,330,503 |  |  |  | 2,040,269 |  |  |  | 2,330,503 | 2,040,269 | 6,057,783
Operating segment | Development / Redevelopment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 233,431 | 222,222 | 186,852
NOI |  |  |  |  |  |  |  |  | 160,816 | 145,630 | 117,879
Gross real estate | 4,755,315 |  |  |  | 4,238,967 |  |  |  | 4,755,315 | 4,238,967 | 3,972,180
Segment Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Gross real estate | 84,293 |  |  |  | 484,377 |  |  |  | 84,293 | 484,377 | 180,516
Non-allocated |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 5,599 | 9,947 | 11,050
Gross real estate | $ 74,292 |  |  |  | $ 73,372 |  |  |  | 74,292 | 73,372 | 32,444
Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 2,016,825 | $ 1,800,354 | $ 1,604,357
Avalon at Edgewater [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting |  |  |  |  |  |  |  |  |  |  |
Gain on Business Interruption Insurance Recovery |  |  |  |  |  |  |  |  | $ 20,306 |  |

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