Originally built in 1964, 680 Folsom Street is 14-story office building with 468,783 square feet of rentable space that has been completely renovated and seismically retrofitted, and was reopened in January 2014. The building is the principal structure in a three-building complex that includes an adjacent three-story office building and a two-story retail/office building, both also renovated as part of the overall project acquisition and development plan. Renovation of 680 Folsom involved removal and replacement of nearly everything in the building except the steel frame. Also, two floors were added, as were four horizontal additions. The building complex was sold during construction to Boston Properties, a major real estate investment trust (REIT).