Organization	12 Months Ended
Dec. 31, 2018
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 three corporations organized to operate as real estate investment trusts (“REIT”). Collectively, the three REITs are referred to as the “Sponsored REITs”. As of December 31, 2018, the Company owned and operated a portfolio of real estate consisting of 32 operating properties, three redevelopment properties, three 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.

Organization

12 Months Ended

Dec. 31, 2018

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 three corporations organized to operate as real estate investment trusts (“REIT”). Collectively, the three REITs are referred to as the “Sponsored REITs”.

As of December 31, 2018, the Company owned and operated a portfolio of real estate consisting of 32 operating properties, three redevelopment properties, three 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.