601-603 Mississippi St, San Francisco, CA 94107

The three-story, two-unit multi-family residential building at 601-603 Mississippi Street in Potrero Hill, owned by Barbara O Lane, was constructed in 1902 and has undergone several significant improvements over the years. Most recently, in November 2024, the property received window replacements on two side windows, with both installations using wood composite double-hung units meeting modern energy efficiency standards (U-factor 0.30). The building has seen substantial upgrades to its systems, including a complete HVAC overhaul in March 2008 when both units received new 92% efficiency furnaces.

A notable sustainability initiative was completed in 2006 with the installation of a solar panel system that included 24 panels and two inverters, representing the building's commitment to renewable energy. The property underwent significant structural work in the mid-2000s, including foundation repairs and underpinning work. Multiple permits were issued between 2005-2006 to address dry rot issues and make necessary foundation clarifications, though some of these permits expired.

In 2008, the building's electrical systems were updated, including temporary power modifications and a Ufer ground inspection. Earlier records from 2008 indicate at least one water-related maintenance issue that was resolved through the PUC Water department. Additionally, the property underwent a rear yard renovation that required a variance approval, allowing for the replacement of an existing deck and stairs, which was successfully completed with neighborhood support.