4414-4416 20th St, San Francisco, CA 94114

The two-unit residential building at 4414-4416 20th Street, owned by Ivy Ho, was constructed in 1908 and has undergone significant recent improvements, particularly between 2021 and 2024. The most substantial development was the construction of a 795-square-foot accessory dwelling unit (ADU) at ground floor level in 2021-2022, which included comprehensive system upgrades across all units. Recent safety enhancements include the installation of a new NFPA 13 fire sprinkler system and dedicated fire service connection in 2022-2023, with additional fire safety improvements continuing into 2024 including a new sprinkler monitoring system with associated equipment.

The building has seen substantial infrastructure improvements, including a complete window replacement at the front of the building in 2022, sewer lateral and house trap replacement, and water line upgrades in 2023. The property underwent significant system upgrades, including electrical improvements with the installation of a new 200-amp panel and additional subpanels, and mechanical improvements such as furnace replacement across all units. Various building permits indicate ongoing maintenance and modernization efforts, including bathroom remodels and closet installations.

While the building experienced some plumbing issues in 2021 with two recorded sewage backups, these were addressed and resolved. A minor exterior maintenance issue regarding peeling paint was quickly resolved in 2011. Recent municipal records show no active violations or complaints, and the building has received systematic updates to meet current safety and living standards, with particular emphasis on fire safety enhancements and general infrastructure modernization.