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Real Estate Transactions - Sierra Point Towers Acquisition (Details) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Nov. 30, 2018 USD ($) property | Dec. 31, 2018 USD ($) property | Mar. 31, 2018 USD ($)
Real Estate [Line Items] |  |  |
Payments to acquire real estate |  |  | $ 21
Nonrefundable deposit | $ 15 |  |
Life science joint ventures |  |  |
Real Estate [Line Items] |  |  |
Number of properties acquired (in properties) | property | 4 | 2 |
Payments to acquire real estate | $ 92 | $ 245 |

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- Definition The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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