Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Line Items]

Property, Plant and Equipment [Table Text Block]

The Company anticipates the estimated useful lives of its assets by class to be generally as follows:



Buildings		40 years
Building Improvements		5-20 years
Land Improvements		15-25 years
Tenant Improvements		Shorter of estimated useful life or remaining contractual lease term
Tenant Origination and Absorption Cost		Remaining contractual lease term
In-place Lease Valuation		Remaining contractual lease term with consideration as to below-market extension options for below-market leases

Griffin Capital Essential Asset REIT, Inc. [Member]

Accounting Policies [Line Items]

Property, Plant and Equipment [Table Text Block]

The Company anticipates the estimated useful lives of its assets by class to be generally as follows:



Buildings	25-40 years
Building Improvements	5-20 years
Land Improvements	15-25 years
Tenant Improvements	Shorter of estimated useful life or remaining contractual lease term
Tenant Origination and Absorption Cost	Remaining contractual lease term
In-place Lease Valuation	Remaining contractual lease term with consideration as to below-market extension options for below-market leases