This 35-unit residential mixed-use building is an adaptive reuse of a 1920’s former tobacco warehouse at the corner of South Park, an urban public park in the SOMA district of San Francisco. The converted 52,164 sq. ft. historic concrete structure features 35 residential units, 5,000 sq. ft. of first floor commercial space, a penthouse unit, below grade parking for 35 cars, and a rooftop deck. Two curving courtyards carved out of the structure furnish the residential units with light and air, creating units with two exposures and unique identities. In keeping with The Secretary of Interiors Standards for Historic Rehabilitation, the project enclosed an existing railroad spur with modern fenestration thereby preserving the historic building elements. An outside at grade terrace also preserved the historic railroad tracks and created an urban patio directly accessible from the sidewalk.