Subsequent Event	3 Months Ended
Mar. 31, 2020
Subsequent Events [Abstract]
Subsequent Event	Subsequent EventThe response to the COVID-19 pandemic continues to rapidly evolve, and aggressive actions taken to reduce the spread of the disease have seriously disrupted activities in large segments of the economy. Columbia Property Trust is monitoring the COVID-19 outbreak and its impact on the Company's business, tenants, and industry as a whole. While the extent to which COVID-19 impacts the Company's results will depend on future developments, the outbreak and associated economic impacts could result in a material impact to the Company's future financial condition, results of operations, and cash flows. Some effects could include lease modifications, deferral of rental income, and increased operating expenses. See Part II, Item 1A. Risk Factors, for additional information.

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

Name:	us-gaap_SubsequentEventsTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration