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Master Transactions and Cooperation Agreement with Brookdale ("Brookdale Transaction") - Master Lease Transactions (Details) - Master Lease Transactions - Assets Leased to Others - Affiliated Entity $ in Millions | Nov. 01, 2017 USD ($) property | Jan. 01, 2018 USD ($) property
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Senior housing triple-net |  |
Lease Amendments And Terminations And Joint Venture Formations. |  |
Number of properties | 34 |
Properties with right to sell or transition to other operator | 32 |
right to sell or transfer period for operating leases | 1 year |
Properties transitioned to cash flow leases expiration period | 2 years |
Number of assets to be sold | 2 |
Total consideration for disposition of real estate | $ | $ 35 |
Senior housing triple-net | Subsequent Event |  |
Lease Amendments And Terminations And Joint Venture Formations. |  |
Amount of annual rent cut | $ |  | $ 5
Number of assets with annual rent cut |  | 3
Brookdale Senior Living |  |
Lease Amendments And Terminations And Joint Venture Formations. |  |
Number of properties | 78 |

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