1224-1226 4th Ave, San Francisco, CA 94122

This two-unit residential building, located at 1224 4th Avenue in San Francisco's Inner Sunset neighborhood, is a 1907 two-story flats and duplex structure currently owned by Henry & Julia Yim 2004 Family Trust.

The property's permit history reveals two significant renovations: in 1988, improvements were made to the rear of the building including the replacement of existing rooms and stairs, along with the addition of a new laundry room, a project that was successfully completed.

More recently, in May 2023, comprehensive gas line replacements were carried out for both units (1224 and 1226), with this plumbing work also being marked as completed. While the building's records show proper maintenance and upgrades over the years, particularly with respect to essential systems like gas lines, the 35-year gap between these major renovations may indicate limited recent structural modifications, though the plumbing work suggests attention to safety infrastructure when required.