144-148 21st Ave, San Francisco, CA 94121

The three-unit residential building at 144-148 21st Avenue, located in the Lake -- The Presidio neighborhood, is a 3-story flats and duplex structure built in 1910, currently owned by Linddy Y K Chen. The property has undergone several significant modifications and improvements over the years, with the most recent major work including the replacement of water heater and laundry sink in 2022, and extensive electrical remodeling in 2006 involving the installation of 30 lights, 15 switches, 35 receptacles, and 1 panel.

Between 2004-2006, there were important structural modifications including the relocation and expansion of a rear cottage unit, installation of fire-rated glass block windows, and the enclosure of stairs, while 1997-1998 saw various bathroom renovations and siding replacements completed. The building's maintenance history shows attention to basic infrastructure, including a reroofing project in 2001, though some permits from this period are listed as expired.

Two complaints were filed regarding construction work - one in 2006 concerning potential asbestos during cottage demolition, and another in 2010 about unauthorized crane use and noise, both of which were promptly addressed. More recently, there has been recurring street parking enforcement activity near the property, with multiple citations issued for driveway blocking between 2021-2024, though these are external issues not directly related to the building's condition or management. Planning records indicate historical discussions about expanding the structure and its occupancy status, with various approvals and disapprovals documented between 1997-2004, though the most recent planning actions show no pending issues.