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Real Estate (Tables) | 9 Months Ended
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Sep. 30, 2015
Schedule of Real Estate Investments And Accumlated Depreciation [Table Text Block} | The following table summarizes the carrying amounts for the Company’s investment in real estate (at cost) as of September 30, 2015 and December 31, 2014 (amounts in thousands):
|  | September 30, 2015 |  | December 31, 2014
Land |  | $ | 6,424,887 |  |  | $ | 6,295,404 |
Depreciable property: |  |  |  |
Buildings and improvements |  | 18,527,779 |  |  | 17,974,337 |
Furniture, fixtures and equipment |  | 1,497,314 |  |  | 1,365,276 |
In-Place lease intangibles |  | 515,154 |  |  | 511,891 |
Projects under development: |  |  |  |
Land |  | 295,798 |  |  | 466,764 |
Construction-in-progress |  | 743,859 |  |  | 877,155 |
Land held for development: |  |  |  |
Land |  | 120,007 |  |  | 145,366 |
Construction-in-progress |  | 34,683 |  |  | 39,190 |
Investment in real estate |  | 28,159,481 |  |  | 27,675,383 |
Accumulated depreciation |  | (5,914,695 | ) |  | (5,432,805 | )
Investment in real estate, net |  | $ | 22,244,786 |  |  | $ | 22,242,578 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] | The following table summarizes the carrying amounts for the Company's above and below market ground and retail lease intangibles as of September 30, 2015 and December 31, 2014 (amounts in thousands):
Description |  | Balance Sheet Location |  | September 30, 2015 |  | December 31, 2014
Assets |  |  |  |  |  |
Ground lease intangibles – below market |  | Other Assets |  | $ | 178,251 |  |  | $ | 178,251 |
Retail lease intangibles – above market |  | Other Assets |  | 1,260 |  |  | 1,260 |
Lease intangible assets |  |  |  | 179,511 |  |  | 179,511 |
Accumulated amortization |  |  |  | (12,318 | ) |  | (8,913 | )
Lease intangible assets, net |  |  |  | $ | 167,193 |  |  | $ | 170,598 |
Liabilities |  |  |  |  |  |
Ground lease intangibles – above market |  | Other Liabilities |  | $ | 2,400 |  |  | $ | 2,400 |
Retail lease intangibles – below market |  | Other Liabilities |  | 5,270 |  |  | 5,270 |
Lease intangible liabilities |  |  |  | 7,670 |  |  | 7,670 |
Accumulated amortization |  |  |  | (3,129 | ) |  | (2,258 | )
Lease intangible liabilities, net |  |  |  | $ | 4,541 |  |  | $ | 5,412 |
Schedule of Expected Amortization Expense [Table Text Block] | The following table provides a summary of the aggregate amortization expense for above and below market ground lease intangibles and retail lease intangibles for each of the next five years (amounts in thousands):
|  | Remaining |  |  |  |  |  |  |  |  |  |
|  | 2015 |  | 2016 |  | 2017 |  | 2018 |  | 2019 |  | 2020
Ground lease intangibles |  | $ | 1,080 |  |  | $ | 4,321 |  |  | $ | 4,321 |  |  | $ | 4,321 |  |  | $ | 4,321 |  |  | $ | 4,321 |
Retail lease intangibles |  | (232 | ) |  | (896 | ) |  | (540 | ) |  | (71 | ) |  | (71 | ) |  | (71 | )
Total |  | $ | 848 |  |  | $ | 3,425 |  |  | $ | 3,781 |  |  | $ | 4,250 |  |  | $ | 4,250 |  |  | $ | 4,250 |
Acquired and Disposed Properties [Table Text Block] | During the nine months ended September 30, 2015, the Company acquired the entire equity interest in the following from unaffiliated parties (purchase price in thousands):
|  | Properties |  | Apartment Units |  | Purchase Price
Rental Properties |  | 1 |  |  | 202 |  |  | $ | 130,275 |
Land Parcels (1) |  | — |  |  | — |  |  | 27,800 |
Total |  | 1 |  |  | 202 |  |  | $ | 158,075 |
(1) During the third quarter of 2015, the Company acquired two land parcels in San Francisco which will be combined with an additional land parcel acquired earlier in the year for future development. During the nine months ended September 30, 2015, the Company disposed of the following to unaffiliated parties (sales price in thousands):
|  | Properties |  | Apartment Units |  | Sales Price
Rental Properties (1) |  | 7 |  |  | 1,707 |  |  | $ | 464,812 |
Total |  | 7 |  |  | 1,707 |  |  | $ | 464,812 |
(1) Includes a 193,230 square foot medical office building adjacent to our Longfellow Place property in Boston with a sales price of approximately $123.3 million which is not included in the Company's property and apartment unit counts.

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