4407-4409 20th St, San Francisco, CA 94114

The property at 4407-4409 20th Street is a two-story multi-family residential building constructed in 1900, currently owned by Robert J. Simon and Linda C. The building has undergone significant transformations and improvements over the past several years, most notably the addition of an ADU (Accessory Dwelling Unit) at the ground floor completed in 2019, which included comprehensive structural, electrical, and plumbing work valued at over $95,000.

Between 2018 and 2020, the building received important safety upgrades including a voluntary seismic retrofit, the installation of a sprinkler system on the ground floor, and subsequent sprinkler flow monitoring, all indicating a commitment to improving building safety standards. The property has seen substantial residential unit improvements, with completed renovations on multiple floors including kitchen and bathroom updates across different units, particularly during 2019-2020 when approximately $200,000 was invested in various unit upgrades. There were some historical compliance concerns, including a 2017 complaint about unpermitted remodeling work and a 2016 report regarding an allegedly unauthorized unit creation in the garage area, though these issues appear to have been resolved through subsequent permitted work.

The building's maintenance history shows regular attention to infrastructure needs, with recent permits for heating system installation, plumbing updates, and electrical improvements. Recent building activity has been primarily focused on general maintenance and infrastructure improvements, with no significant safety incidents or violations reported in the past several years, aside from ongoing issues with sidewalk pavement and parking concerns noted in 2023. The most recent documented building safety incident was a false alarm system activation with no fire involvement.