421-429 Green St, San Francisco, CA 94133

The three-story multi-family residential building at 421-429 Green Street in Telegraph Hill, owned by 421 Green Street LLC, features 6 units and was constructed in 1907. The property has undergone significant improvements over the past decade, most notably a completed soft-story retrofit (Tier 3, CFC Issued) in 2017 costing $45,000, and an ADU addition of 474 sq. ft.

(currently under review) that includes a new kitchen, bath, and living area. Between 2014-2015, multiple units underwent kitchen and bathroom renovations with a strong focus on energy efficiency, including the installation of new lighting fixtures and electrical systems. The building's heating system was notably addressed following two violations in January 2014 regarding inadequate heat provision, which were resolved by March 2014 through the installation of new furnaces and duct work in all units. The property has a history of maintenance issues in the 2000s that were addressed, including building violations in 2006 for various safety and maintenance concerns such as fire escape ladders, handrails, and fire extinguishers, all of which were abated by March 2014.

A tenant buyout occurred at unit 427 in August 2018 for $68,000. Recent building updating activity has primarily focused on modernization and safety compliance, with the last major building work being the ADU and soft-story retrofit. The building has experienced recurring issues with sidewalk parking violations near the property, with multiple reports between 2020-2025, though these are external to the building's maintenance concerns. The most recent fire incident recorded was an unintentional alarm transmission with no civilian injuries.