687-689 28th Ave, San Francisco, CA 94121

The two-unit residential building at 687-689 28th Avenue in San Francisco's Central Richmond neighborhood is a two-story flats and duplex structure built in 1924, currently owned by Young Hanping. The building has undergone several significant modifications and maintenance work over the years, with the most substantial renovation occurring in 2004 when a $15,000 project added a half bathroom, exercise room, workshop, and laundry facilities to the ground floor, including associated electrical work with multiple new features.

More recent activity includes a filed permit in July 2022 related to soil grouting work at the property, presumably connected to nearby construction at 685 28th Avenue. The building's maintenance history shows attention to accessibility with an exterior stairway lift installation attempted in 2000 (permit expired), and earlier roofing work from 1998 (permit expired).

The property has experienced some parking-related issues on the street, with multiple violations reported between 2019-2024, including two instances of sidewalk parking in April 2019 and a driveway blocking incident in March 2024, though these are external to the building itself and primarily relate to street management. Importantly, there was one documented gas leak incident (natural gas/LPG) recorded in the building's history, though no civilian injuries were reported. The combined history of permits and reported incidents suggests regular maintenance and some modification for improved functionality, with the most significant structural work having been completed in 2004.