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4323 20TH ST

Castro/Upper Market · San Francisco, CA · Parcel 2751028 · Last violation Mar 4, 2026 · Last complaint Nov 6, 2025

NeighborhoodCastro/Upper Market
More violations than 96% of nearby buildings
More violations than 96% of buildings and more complaints than 99% of buildings in Castro/Upper Market. Size-normalized against residential buildings in the neighborhood.
ViolationsComplaints
Activity TrendsLast 5 years
More activity recently than in past years
Last 2 yrs: 16 violations · 13 complaints
'22'26ViolationsComplaints
Severityⓘopen violations
All DBI violations have been resolved
Notices of Violation issued by the Department of Building Inspection, by current status.
Severe0
Serious0
Minor0

What to watch forⓘ

  1. Fire safety problems have been reported here.
    Worth checkingⓘ
    Walk the exit route from the unit to the street and check the stairs and hallways are clear of stored items, and that fire doors close properly.
    details ▸

    California law requires safe fire or emergency exits leading to a street or hallway, and requires stairs, hallways and exits to be kept litter free. Storage areas, garages and basements must be kept free of combustible materials. San Francisco's Housing Code separately treats inadequate exits and inadequate fire protection equipment as conditions that make a building substandard, which is the finding behind a notice of violation.

    • California Tenant Guide
    • San Francisco Housing Code §1001(m), (n)
  2. Tenants here have reported mold.
    Worth checkingⓘ
    Look for dark spots on walls, floors and ceilings, and for dry or wet spots, flaking or bubbling, or a damp or moldy smell, especially in bathrooms and closets.
311 Housing Complaints
Total complaints since 2025
13
7 per year avg.↑ Rising — no prior history
Complaint severity
Last 5 years
13
Severeⓘ2
Seriousⓘ9
Minorⓘ2
Dept. of Building Inspection Violations
Total violations since 2000
45
2 per year avg.↑ Up 167% in the last 2 years (16 vs 6 prior 2 yrs)
Open violations
0
No open DBI violations on record.

Top violation categories

5 yrsAll time
Cleanliness & refuseⓘ5 violations
Smoke detectorsⓘ2 violations
Moldⓘ2 violations
Exterior & windowsⓘ1 violations
Fire safetyⓘ1 violations
Gas shutoff & metersⓘ1 violations
Electricalⓘ1 violations
No specific condition stated9 violations
See violation log below.

Top complaint types

5 yrsAll time
Mold And Mildew7 complaints
General Maintenance Not In List Above2 complaints
Ventilation Inadequate Or None2 complaints
Blocked Exit Common Areas1 complaints
Paint Lead Violating Safe Practices1 complaints
See violations (45) →See complaints (13) →
See something wrong? File a complaint with SF 311
details ▸

San Francisco's Health Code treats visible or otherwise demonstrable mold or mildew in a residential building as a public health nuisance in its own right. Under state law, mold that the landlord has notice of and that affects livability or health can also breach the implied warranty of habitability.

  • California Tenant Guide
  • San Francisco Health Code §581(b)(6)
  • Unsafe work on paint has been reported here.
    Worth checkingⓘ
    Look for chipping or flaking paint, especially in older buildings and on window frames, door frames and stair rails, and for paint dust or debris left behind after recent work.
    details ▸

    San Francisco's Health Code presumes that any paint on a building built before 1979 is lead based unless shown otherwise, and treats lead hazards as a public health nuisance. Disturbing that paint without controlling the dust is what spreads the hazard. California law separately treats a lead hazard that endangers the occupants as a condition that can make a rental unit uninhabitable.

    Ask when the building was built and whether any paint work has been done recently. If it was built before 1978, read the federal booklet Protect Your Family From Lead in Your Home.

    • California Tenant Guide
    • San Francisco Health Code §581(b)(10)