646-648 Madrid St, San Francisco, CA 94112

The property at 646-648 Madrid Street in the Excelsior neighborhood is a two-unit, two-story multi-family residential building constructed in 1905, currently owned by Tin Justin. This building has undergone significant alterations and faced multiple regulatory challenges over its history. Major structural and safety issues were addressed between 2007-2009, including the improper conversion of basement space, unauthorized electrical modifications, and various building code violations that resulted in multiple notices of violation (NOVs).

The most substantial work occurred in 2008-2009, when repairs were made to address foundation issues ($26,000), code violations, and fire safety requirements. The building underwent earlier maintenance work in 2012 with repairs to rear siding and stairs ($8,000). Recent developments include a proposed project to demolish the existing two-unit structure and construct a new four-unit building with a two-car garage and an ADU, seeking to utilize the Fourplex Density Bonus under California housing laws.

The proposal includes adding new living spaces and modern amenities while addressing previous building concerns. This significant redevelopment effort represents the most substantial change to the property in decades, currently in the planning stages with submissions made in 2023. Recent tenant-related issues have primarily involved typical urban concerns such as parking violations and garbage management, with several cases resolved through city intervention in 2024. The property has maintained active compliance with housing standards since the major violations were addressed in 2009, though the building's age and history suggest ongoing maintenance requirements are likely.