727 21st Ave, San Francisco, CA 94121

The two-unit multi-family residential building at 727 21st Avenue, owned by Duck Y Ng & Mandy M Wu Lvg, was constructed in 1923 as a two-story flats and duplex structure in San Francisco's Central Richmond neighborhood. The building has undergone several significant modifications over the years, including a completed basement renovation in 1995 that added a guest room, work room, playroom, and bathroom.

In 2010, electrical work was completed involving the installation of a 60-amp house meter for both 727 and 729 21st Avenue. A building complaint was filed in October 2021 regarding unpermitted interior work that appeared to involve kitchen remodeling, though this complaint is currently listed as not active. The property has experienced recurring issues with parking violations in recent years, with multiple documented cases of driveway blocking between 2021 and 2024, resulting in citations being issued.

Other notable incidents include a sewer backup in March 2015 that was resolved by the Public Utilities Commission, and various maintenance and safety issues documented through 311 calls between 2019 and 2024, including a noise complaint, graffiti removal, and a sidewalk parking violation. An expired roofing permit from 1994 is also on record, though this is likely outdated given the age of the permit. While the building has experienced several maintenance and compliance-related issues over the years, particularly in recent years regarding unpermitted work and parking violations, most documented complaints and incidents have been addressed through proper channels.