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Real Estate (Tables) | 6 Months Ended
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Jun. 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 June 30, 2015 and December 31, 2014 (amounts in thousands):
|  | June 30, 2015 |  | December 31, 2014
Land |  | $ | 6,374,779 |  |  | $ | 6,295,404 |
Depreciable property: |  |  |  |
Buildings and improvements |  | 18,328,935 |  |  | 17,974,337 |
Furniture, fixtures and equipment |  | 1,446,235 |  |  | 1,365,276 |
In-Place lease intangibles |  | 515,154 |  |  | 511,891 |
Projects under development: |  |  |  |
Land |  | 406,251 |  |  | 466,764 |
Construction-in-progress |  | 833,993 |  |  | 877,155 |
Land held for development: |  |  |  |
Land |  | 97,387 |  |  | 145,366 |
Construction-in-progress |  | 30,172 |  |  | 39,190 |
Investment in real estate |  | 28,032,906 |  |  | 27,675,383 |
Accumulated depreciation |  | (5,736,913 | ) |  | (5,432,805 | )
Investment in real estate, net |  | $ | 22,295,993 |  |  | $ | 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 June 30, 2015 and December 31, 2014 (amounts in thousands):
Description |  | Balance Sheet Location |  | June 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 |  |  |  | (11,185 | ) |  | (8,913 | )
Lease intangible assets, net |  |  |  | $ | 168,326 |  |  | $ | 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 |  |  |  | (2,839 | ) |  | (2,258 | )
Lease intangible liabilities, net |  |  |  | $ | 4,831 |  |  | $ | 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 |  | $ | 2,161 |  |  | $ | 4,321 |  |  | $ | 4,321 |  |  | $ | 4,321 |  |  | $ | 4,321 |  |  | $ | 4,321 |
Retail lease intangibles |  | (469 | ) |  | (896 | ) |  | (540 | ) |  | (71 | ) |  | (71 | ) |  | (71 | )
Total |  | $ | 1,692 |  |  | $ | 3,425 |  |  | $ | 3,781 |  |  | $ | 4,250 |  |  | $ | 4,250 |  |  | $ | 4,250 |
Acquired and Disposed Properties [Table Text Block] | During the six months ended June 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 Parcel (one) |  | — |  |  | — |  |  | 5,968 |
Total |  | 1 |  |  | 202 |  |  | $ | 136,243 |
During the six months ended June 30, 2015, the Company disposed of the following to unaffiliated parties (sales price in thousands):
|  | Properties |  | Apartment Units |  | Sales Price
Rental Properties (1) |  | 6 |  |  | 1,377 |  |  | $ | 386,662 |
Total |  | 6 |  |  | 1,377 |  |  | $ | 386,662 |
(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.

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- Definition Tabular disclosure of all information related to any significant acquisition and disposal. Disclosure may include methodology and assumptions, type of asset, asset classification, useful life, useful purpose, acquisition cost, method of acquisition or disposal, depreciation method, gain (loss) on disposal pretax and net of tax, date of acquisition or disposal and restrictions on amount of proceeds from donated assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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