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Segment Reporting Reportable Segments (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 segment | Sep. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | $ 169,441,000 |  | $ 62,278,000 | $ 464,915,000 |  | $ 184,267,000 |  |
Interest expense | (17,674,000) |  |  | (46,640,000) |  |  |  |
Depreciation and amortization expense | (37,880,000) |  |  | (96,632,000) |  |  |  |
Income Tax Expense (Benefit) | 3,004,000 |  |  | 4,153,000 |  |  |  |
Income (Loss) from Equity Method Investments | 0 |  |  | 0 |  | 14,816,000 |  |
Segment assets | 3,302,016,000 |  |  | 3,302,016,000 |  |  | 2,476,061,000 |
Investment in non-controlled entities | 0 |  | 88,304,000 | 0 |  | 88,304,000 |  | 76,879,000
Number of reportable segments |  |  |  | 2 |  |  |  |
Real Estate, Segment [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 127,942,000 |  | 56,374,000 | 346,807,000 |  | 165,852,000 |  |
Operating Expenses, Excluding Noncash Items | (74,215,000) |  | (22,173,000) | (202,504,000) |  | (63,918,000) |  |
Interest expense | (17,674,000) |  | (14,906,000) | (46,640,000) |  | (43,817,000) |  |
Depreciation and amortization expense | (37,797,000) |  | (12,763,000) | (96,404,000) |  | (38,030,000) |  |
Income Tax Expense (Benefit) | (371,000) |  |  | (1,024,000) |  |  |  |
Income (Loss) from Equity Method Investments |  |  | 6,918,000 |  |  | 14,816,000 |  |
Segment assets | 3,038,363,000 |  | 1,023,333,000 | 3,038,363,000 |  | 1,023,333,000 |  |
Investment in non-controlled entities |  |  | 88,304,000 |  |  | 88,304,000 |  |
Expenditures for segment assets | 422,175,000 |  | 23,118,000 | 459,910,000 |  | 56,129,000 |  |
Observatory, Segment [Member] [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 35,684,000 |  |  | 83,374,000 |  |  |  |
Operating Expenses, Excluding Noncash Items | (26,982,000) |  |  | (72,762,000) |  |  |  |
Interest expense | 0 |  |  | 0 |  |  |  |
Depreciation and amortization expense | (79,000) |  |  | (217,000) |  |  |  |
Income Tax Expense (Benefit) | (2,970,000) |  |  | (3,035,000) |  |  |  |
Segment assets | 255,081,000 |  |  | 255,081,000 |  |  |  |
Expenditures for segment assets | 99,000 |  |  | 99,000 |  |  |  |
Other Segments [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 5,815,000 |  | 5,869,000 | 33,759,000 |  | 18,269,000 |  |
Operating Expenses, Excluding Noncash Items | (7,365,000) |  | (7,623,000) | (36,052,000) |  | (24,651,000) |  |
Interest expense | 0 |  | 0 | 0 |  | 0 |  |
Depreciation and amortization expense | (4,000) |  | 0 | (11,000) |  | 0 |  |
Income Tax Expense (Benefit) | (75,000) |  |  | (94,000) |  |  |  |
Income (Loss) from Equity Method Investments |  |  | 0 |  |  | 0 |  |
Segment assets | 8,572,000 |  | 10,585,000 | 8,572,000 |  | 10,585,000 |  |
Investment in non-controlled entities |  |  | 0 |  |  | 0 |  |
Expenditures for segment assets | 0 |  | 0 | 0 |  | 0 |  |
Total, Segment [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 169,441,000 |  | 62,243,000 | 463,940,000 |  | 184,121,000 |  |
Operating Expenses, Excluding Noncash Items | (108,562,000) |  | (29,796,000) | (311,318,000) |  | (88,569,000) |  |
Interest expense | (17,674,000) |  | (14,906,000) | (46,640,000) |  | (43,817,000) |  |
Depreciation and amortization expense | (37,880,000) |  | (12,763,000) | (96,632,000) |  | (38,030,000) |  |
Income Tax Expense (Benefit) | (3,416,000) |  |  | (4,153,000) |  |  |  |
Income (Loss) from Equity Method Investments |  |  | 6,918,000 |  |  | 14,816,000 |  |
Segment assets | 3,302,016,000 |  | 1,033,918,000 | 3,302,016,000 |  | 1,033,918,000 |  |
Investment in non-controlled entities |  |  | 88,304,000 |  |  | 88,304,000 |  |
Expenditures for segment assets | 422,274,000 |  | 23,118,000 | 460,009,000 |  | 56,129,000 |  |
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | (21,474,000) |  | (1,942,000) | (54,903,000) |  | (6,786,000) |  |
Intersegment Eliminations [Member] | Real Estate, Segment [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 19,986,000 | [1] | 19,000 | 51,552,000 | [2] | 56,000 |  |
Intersegment Eliminations [Member] | Observatory, Segment [Member] [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 0 |  |  | 0 |  |  |  |
Intersegment Eliminations [Member] | Other Segments [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 1,488,000 |  | 1,923,000 | 3,351,000 |  | 6,730,000 |  |
Intersegment Eliminations [Member] | Total, Segment [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 21,474,000 |  | 1,942,000 | 54,903,000 |  | 6,786,000 |  |
Operating Segments [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 190,915,000 |  | 64,185,000 | 518,843,000 |  | 190,907,000 |  |
Operating Segments [Member] | Real Estate, Segment [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 147,928,000 |  | 56,393,000 | 398,359,000 |  | 165,908,000 |  |
Segment profit (loss) | 17,871,000 |  | 13,469,000 | 51,787,000 |  | 34,959,000 |  |
Operating Segments [Member] | Observatory, Segment [Member] [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 35,684,000 |  |  | 83,374,000 |  |  |  |
Segment profit (loss) | 5,653,000 |  |  | 7,360,000 |  |  |  |
Operating Segments [Member] | Other Segments [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 7,303,000 |  | 7,792,000 | 37,110,000 |  | 24,999,000 |  |
Segment profit (loss) | (141,000) |  | 169,000 | 953,000 |  | 348,000 |  |
Operating Segments [Member] | Total, Segment [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 190,915,000 |  | 64,185,000 | 518,843,000 |  | 190,907,000 |  |
Segment profit (loss) | $ 23,383,000 |  | $ 13,638,000 | $ 60,100,000 |  | $ 35,307,000 |  |
[1] | The observatory pays a market-based rent payment comprised of fixed and percentage rent to the Empire State Building.
[2] | The observatory pays a market-based rent payment comprised of fixed and percentage rent to the Empire State Building

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