XML 23 R8.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Organization | 12 Months Ended
--- | ---
Dec. 31, 2017
Organization |
Organization | 1. Organization Franklin Street Properties Corp. (“FSP Corp.” or the “Company”), holds, directly and indirectly, 100% of the interest in FSP Investments LLC, FSP Property Management LLC, FSP Holdings LLC and FSP Protective TRS Corp. FSP Property Management LLC provides asset management and property management services. The Company also has a non-controlling common stock interest in six corporations organized to operate as real estate investment trusts (“REIT”) and a non-controlling preferred stock interest in two of those REITs. Collectively, the six REITs are referred to as the “Sponsored REITs”. As of December 31, 2017, the Company owned and operated a portfolio of real estate consisting of 34 properties, one property that is in redevelopment and six managed Sponsored REITs and held four promissory notes secured by mortgages on real estate owned by Sponsored REITs, including two mortgage loans and two revolving lines of credit. From time-to-time, the Company may acquire real estate or make additional secured loans. The Company may also pursue, on a selective basis, the sale of its properties in order to take advantage of the value creation and demand for its properties, or for geographic or property specific reasons.

X
- Definition The entire disclosure for the nature of an entity's business, major products or services, principal markets including location, and the relative importance of its operations in each business and the basis for the determination, including but not limited to, assets, revenues, or earnings. For an entity that has not commenced principal operations, disclosures about the risks and uncertainties related to the activities in which the entity is currently engaged and an understanding of what those activities are being directed toward. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -URI http://asc.fasb.org/topic&trid=2134479 + Details
Name: | us-gaap_NatureOfOperations
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration