1820-1824 Mason St, San Francisco, CA 94133

The three-unit multi-family residential building at 1820-1824 Mason Street in North Beach, owned by Lai Irrevoc Tr, was constructed in 1911 and has undergone several significant improvements over the past decade. Most notably, between 2019-2020, the property was substantially upgraded with the addition of an ADU (Accessory Dwelling Unit) on the ground floor, including installation of a fire sprinkler system, new 60-amp subpanel, and other modern amenities, with construction costs totaling approximately $65,000. In recent years, the building has prioritized safety improvements, including the installation of a fire alarm system in 2020 at a cost of $18,000.

The property's maintenance history shows attention to basic infrastructure, with a complete reroofing project in 2015 costing $17,600, and other plumbing upgrades including kitchen remodeling and furnace replacement work. Historical records from 2005 indicate a number of building violations related to electrical systems, fire safety, and mold issues, though these complaints were all abated by December 2005. Earlier violations included problems with stairs, lighting, and electrical outlets, as well as an initial complaint regarding an illegal unit in the basement.

Since then, the building's record shows no active violations, though there has been one documented sewer issue in 2017 and various routine inspections. The property has undergone significant modernization while addressing past safety concerns, implementing current building codes, and adding valuable living space through the ADU conversion, which includes a separate entrance and dedicated fire safety systems. The title history shows no issues with ownership transfers, and the building's documented improvements suggest ongoing maintenance and investment in resident safety and comfort.