Plans have been published for a potential residential expansion at 477 Duncan Street in Noe Valley, San Francisco. The initial application hopes to pursue development through the Housing Choice-San Francisco Program. Ojanen Chiou Architects is responsible for the application on behalf of the individual property owner.
The HC-SF Program is a locally controlled density bonus law that seeks to provide developers and property owners with greater housing development capacity, without affordable housing requirements, but with slightly more restrictive height and bulk controls. The application calls for a two-story addition and rear expansion to the existing structure. It’s unclear how much of the existing attractive structure will be retained.

477 Duncan Street, image via the city’s planning department
Public records show the existing structure was built in 1935 by Robert A. McAfee in the Art Deco architectural style. The property is located along Duncan Street between Sanchez Street and the pedestrian stairwell rising up to Noe Street. Muni Light Rail is just two blocks away along Church Street.
According to a 2019-published Historic Resource Assessment by the city’s Planning Department, the property was deemed eligible for individual listing because of its architectural merit. The assessment stated that defining features to be retained include the one-story massing over the integrated garage, the stepped parapet, vertical roofline projections, stucco ornamentation, and stucco cladding.
The estimated cost and timeline for construction have yet to be shared.
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Four stories?!? Why do people need such bloody huge houses nowadays – especially in a reasonably dense city? I thought the standard line was that people who wanted to live in cities were the same who rejected living in some McMansion in a remote, car-dependent exurb, but I guess I was wrong. Instead, they want to bring the McMansion to The City. I live in a house like this with my family. It’s big enough, because the city is our living room. And we don’t do the whole cocoon in the house thing and order everything from Amazon and Doordash.