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Fair Value of Assets and Liabilities (Tables) | 3 Months Ended
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Mar. 31, 2015
Fair Value of Assets and Liabilities |
Assets and liabilities measured at fair value |
|  |  |  |  | Quoted Prices in |  | Significant |  | Significant |
|  |  |  |  | Active Markets for |  | Other |  | Unobservable |
|  |  |  |  | Identical Assets |  | Observable Inputs |  | Inputs |
Description |  | Total |  | (Level 1) |  | (Level 2) |  | (Level 3) |
Assets held for sale(1) |  | $ | 3,145 |  | $ | — |  | $ | — |  | $ | 3,145 |
Investments in available for sale securities(2) |  | $ | 25,441 |  | $ | 25,441 |  | $ | — |  | $ | — |
| (1) |  | Assets held for sale consist of four of our properties (seven buildings) that we expect to sell or have sold subsequent to March 31, 2015 that are reported at fair value less estimated costs to sell. We used offers to purchase these properties made by third parties or comparable sales transactions (Level 3 inputs) to determine the fair values of these properties. We have recorded cumulative impairments of approximately $11,365 to these properties in order to reduce their book value to fair value.
| (2) |  | Our investments in available for sale securities include our 250,000 common shares of EQC and 4,235,000 common shares of Five Star. The fair values of these shares are based up on quoted prices at March 31, 2015 in active markets (Level 1 inputs).
We estimate the fair values of our senior unsecured notes using an average of the bid and ask price of our outstanding six issuances of senior notes (Level 1 inputs) on or about March 31, 2015. The fair values of these senior note obligations exceed their aggregate book values of $1,743,983 by $107,931 because these notes were trading at premiums to their face amounts.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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