680 Folsom Street | Renovation
San Francisco, CA



Boston Properties / TMG Partners


Skidmore, Owings & Merrill


Tipping Mar


Plant Construction Company



Contract Value



15-stories (230 ft), 502,000 sqft

LEED Rating

Seeking Gold certification

Building Type


Technology Type

AESS, Reclad, Retrofit, Renovation


190,000 sqft design/build facade package, including a custom unitized curtainwall system, mechanical screen wall, storefront, AESS columns, aluminum fins, shadow box panels, and a cantilevered wing wall


Typical vision lites measure 72" X 123" (VNE1-63 with a 5/16’", 1/2", 3/16" makeup), spandrel glass consists of a 1/4" monolithic lite with a custom flood coat, storefront systems consist of 9/16" laminated glass (VLE24-70), and additional glass lites utilize Viracon’s V1085 simulated acid etch coating


This 1960's mid-rise renovation project includes a new building skin and additional two floors added to its program

The aging precast concrete shell at 680 Folsom Street in San Francisco’s South of Market district is finally receiving a much needed makeover. The renovation evolves around a recladding program that replaces the original 1960’s concrete building shell with 190,000 square feet of facade. The revitalization effort was designed by architect Skidmore, Owings & Merrill to be highly transparent, and consists of a custom unitized curtainwall system, and aluminum fins on three elevations. Typical units span 6’ x 15’. Unique considerations include a cantilevered wing wall that extends three feet from the curtainwall system.

Visual and performance mock-up tests include air infiltration, static/dynamic water tests, structural loading, vertical/horizontal displacement, maintenance platform tieback testing, and inter-story drift testing of façade systems.

Enclos’ installation strategy reuses the existing floor slabs to support these new wall systems, with steel plates welded to the edge of floor slabs for curtainwall anchors. Units will be set using a monorail system at an expedited rate.

Enclos is also contracted to provide design/build facade renovation services for 50 Hawthorne, a three story low-rise adjacent to 680 Folsom Street.

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