18 Jansen St, San Francisco, CA 94133

The property at 18 Jansen Street in Russian Hill is a three-unit, three-story multi-family residential building constructed in 1905 and currently owned by Sebastian F. Colabianchi. The building has experienced several significant maintenance and safety issues over the years, particularly during 2003-2004, when multiple violations were documented regarding security, fire safety, and interior conditions.

These included problems with exterior door latches, smoke detector requirements, gas meter instructions, fire extinguisher maintenance, and interior surface conditions including mold and mildew. A notable complaint in November 2004 reported severe mold problems, non-functioning heaters, and concerns about electrical wiring, though these issues were marked as abated by March 2005. Earlier records from 1996 documented a defective fire escape and sewage/rodent problems, while more recent history shows routine inspections in 2001 and 2007.

The most recent building maintenance work on record is from 1989 when reroofing was completed. Recent neighborhood concerns have primarily involved external issues, with several parking enforcement calls regarding blocked driveways between 2020 and 2024, and occasional reports of human or animal waste on the street/sidewalk (most recent in November 2023). A collapsed sidewalk was reported in February 2024, but was investigated and found to have no defects. The property has maintained an active pattern of addressing violations and complaints, with all documented issues being marked as resolved, though the age of the building and its historical record of moisture-related problems may be of note.