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Mortgage Notes Payable, Net - Multi-Tenant Mortgage Loan IV (Details) $ in Millions	Apr. 12, 2019 USD ($) sate leased_office_and_industrial_property	Jan. 26, 2018 USD ($) sate	Sep. 30, 2019
Multi-Tenant Mortgage Loan IV | Column Financial, Inc. and Societe Generale Financial Corporation
Debt Instrument [Line Items]
Collateral, number of leased offices and industrial properties | leased_office_and_industrial_property	16
Number of states in which mortgaged properties are located (state) | leased_office_and_industrial_property	12
Multi-Tenant Mortgage Loan IV | Mortgage notes payable | Column Financial, Inc. and Societe Generale Financial Corporation
Debt Instrument [Line Items]
Proceeds from loans borrowed	$ 97.5
Repayments of debt	$ 90.0
Interest rate			4.489%
Multi-Tenant Mortgage Loan | Mortgage notes payable
Debt Instrument [Line Items]
Number of states in which mortgaged properties are located (state) | sate	12	6
Repayments of debt		$ 30.0
Interest rate		4.32%

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Contractual interest rate for funds borrowed, under the debt agreement.

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