1434 21st Ave, San Francisco, CA 94122

The two-unit residential building at 1434 21st Ave in the Central Sunset neighborhood, owned by the Lin Family Residence Trust, was constructed in 1925 as a two-story flats and duplex structure. The property has undergone several significant improvements over the years, including the installation of aluminum windows in 1985, a vertical and horizontal addition in 1987, and replacement of rotten stairs in 2007, which were installed to address a building violation from March 2007 related to unpermitted stair construction.

This violation was ultimately abated in June 2010. Recent maintenance and compliance issues have primarily involved tree-related concerns, with two open cases from 2022 regarding sidewalk damage from tree roots and one from 2021 concerning an overgrown tree near communication lines.

The building experienced a sewer issue in August 2020 involving a 4-inch sewer vent that was resolved by the Public Utilities Commission. More recent activity at the property includes a rent board request in July 2024 and two parking-related incidents in 2023 involving blocked driveways. While some of these issues required city intervention, including tree maintenance and sewer repairs, most have been resolved through appropriate channels, with no recent building code violations or major structural modifications on record.