1409-1411 21st Ave, San Francisco, CA 94122

The two-unit residential building at 1409-1411 21st Avenue in the Central Sunset neighborhood is a two-story flats and duplex structure built in 1938, currently owned by Raymond J. Cho. The property has undergone several significant improvements and maintenance work over the past decade, with the most substantial recent project occurring in 2020-2022 involving voluntary strengthening work at both units, with a total estimated cost of $50,000.

This project required multiple permit revisions in 2022 due to field conditions. In 2013-2014, major updates were completed including kitchen and laundry room remodels, basement bathroom installation, and mechanical system upgrades including the relocation of two furnaces and water heaters, all supported by appropriate plumbing and electrical permits. The building has experienced some maintenance issues and resident concerns that warrant attention.

A sewage backup incident was reported in July 2020, and there were two complaints in 2022 regarding construction noise and work occurring without permits, though these issues were subsequently addressed. The property's maintenance history shows attention to structural elements, including reroofing work in 2015 and stair removal work planned in 2014. Recent 311 calls from 2023-2024 have primarily related to parking enforcement issues on the sidewalk near the property and a damaged side sewer vent cover, with one 2020 sewer issue being resolved. While the building has undergone significant modernization and safety improvements, particularly in terms of seismic strengthening and mechanical systems, there have been occasional maintenance and compliance issues that have required attention.