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21 Guerrero St

Mission Dolores, SF 94103 3502038 7 units · 3 fl · 1925

This building has a higher-than-average number of open problems nearby. Few open issues; problems get fixed quickly. A reasonable bet for a smooth tenancy.

NOVs (7y) vs. neighborhood
Compared to a typical building in Mission Dolores
Above average
avg 2.9
5
FewerMore

This building has 5 novs (7y), above the Mission Dolores average of 2.9.

Rent & eviction protection

Is 21 Guerrero St rent-controlled?

San Francisco's Rent Ordinance caps rent increases and provides eviction protection for most residential units built before 1979 with 2+ units. Here's how this building scores.

Built before 1979
Built 1925
2 or more units
7 units
Property type
Multi-Family Residential
Zoning
RM2
Likely rent-controlled. Building age and unit count suggest this property falls under San Francisco's Rent Ordinance.

Based on SF Assessor records. Not legal advice — confirm with the SF Rent Board.

Building characteristics
Units7
Floors3
Year built1925
Total area4,680 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot3502038
Ownership

Registered owner per SF Assessor-Recorder (secured roll).

Owner name
15-21 Guerrero Street Assoc
Mailing address
Aurita H Nocon Po Box 64314 Sunnyvale CA 94088
Last sale
000000

Landlord portfolio

Other SF properties this owner holds, with risk grades for each.

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Augrented Insights
AI summary

21 Guerrero Street is a 3-story, 7-unit multi-family residential building constructed in 1925 and currently owned by the 15-21 Guerrero Street Association. The property has undergone several significant safety and infrastructure improvements in recent years, most notably completing a mandatory soft-story retrofit in 2017 (cost: $53,000) to enhance seismic safety. In 2018, the building received a comprehensive upgrade to its fire safety systems, including the installation of a wireless fire alarm system ($16,000) and associated egress lighting improvements. More recently, in 2024, the building underwent a critical infrastructure upgrade with the replacement of the water main. However, the property has experienced recurring water-related issues, with the most recent complaints in May 2024 citing multiple water leaks affecting both the lobby and second-floor areas, along with associated mold/mildew problems, though these violations were abated by July 2024.

The building's maintenance history reveals attention to critical systems and infrastructure, including window replacements and staircase repairs due to dry rot in 2018, though the property has faced several violations over the years. A routine inspection in 2003 documented multiple issues, including concerns with security features, fire safety systems, stairs, and lighting, all of which were subsequently addressed. While there have been occasional complaints about building maintenance and external factors like graffiti and sidewalk conditions, these have generally been resolved promptly. The building's most recent permits and inspections suggest ongoing attention to safety and infrastructure maintenance, though the recent water-related issues indicate some challenges with building envelope and plumbing systems.

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Risk rating

How 21 Guerrero St's risk score is calculated

We trained a model on 7 years of SF DBI inspection data — notice of violation filings, complaint history, and owner track records. It estimates the probability that DBI inspectors will issue a Notice of Violation at this address in the next 12 months. Lower % = safer.

What the score means for you

Grade A–B — Low risk

DBI rarely finds violations here. Strong maintenance history and a clean complaint record.

Grade C — Moderate risk

Some past violations or complaints on record. Worth asking the landlord about any open issues before signing.

Grade D–F — High risk

Elevated violation and complaint history. DBI has found issues here before and is statistically likely to again.

Neighborhood percentile
55th percentile

Out of 799 buildings in this neighborhood, 360 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
66%
No DBI
violation
34%
DBI violation
likely
Model explanation

What's driving this score

The three data points that most influenced this building's risk rating — ranked by the weight the model placed on each one.

Number of units

The number of units affects how the model reads complaint and violation totals — more units means more potential sources.

DBI tenant complaints (past 7 years)

Formal complaints tenants filed with DBI about this building over 7 years.

Neighborhood (ZIP code)

The ZIP code captures local housing market and enforcement patterns that affect all buildings in the area.

12-Month severity forecast
No violation 45.3%
Moderate concern 24.4%
Severe concern 30.3%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months at each severity level. Model: full_hgb_balanced.
Apartment reviews

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The story over time

21 Guerrero St event timeline

Violations, complaints, fire incidents, permits, and buyouts — most recent records in order.

2026
311 Request May 21
Garbage and debris
furniture
311 RequestMar 24
311 service request

See all 12 events

Full history back to 2024 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 21 Guerrero St apartments

13 SF public datasets for this parcel — permits, violations, complaints, fire records, 311 calls, planning records, and buyouts.

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