401-403 42nd Ave, San Francisco, CA 94121

The property at 401-403 42nd Avenue in San Francisco's Outer Richmond neighborhood is a 2-story multi-family residential building constructed in 1948, currently owned by He Yanyi. The building, which consists of two units and has a flats and duplex classification, has undergone several significant modifications over the years. In the late 1990s, there were attempts to implement a horizontal addition, though this permit eventually expired.

A notable improvement was made in 2007 with the construction of a solarium on the existing roof deck, a project that required and received variance approval from the planning department. More recently, the building received HVAC upgrades in 2014, including the installation of a new furnace system. The property has generated multiple 311 calls over the past year, primarily related to street cleaning and parking issues, though none of these directly pertain to the building's structural integrity or habitability.

Of particular note is a change of use that occurred at 403 42nd Avenue, where a former dance studio was converted into a daycare center with some interior modifications. The building's maintenance record appears relatively modest, with no major structural issues or safety concerns documented in recent years. The most recent building modifications were focused on energy efficiency improvements through HVAC system upgrades, indicating some attention to modernizing building infrastructure.