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431-433 21St Ave

Central Richmond, SF 94121 1523005 2 units · 2 fl · 1924

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 Central Richmond
At or below average
avg 0.5
0
FewerMore

This building has 0 novs (7y), at or below the Central Richmond average of 0.5.

Rent & eviction protection

Is 431-433 21St Ave 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 1924
2 or more units
2 units
Property type
Multi-Family Residential
Zoning
RH2
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
Units2
Floors2
Year built1924
Total area3,150 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot1523005
Ownership

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

Owner name
Nancy F Ozaki 2000 Lvg Tr
Mailing address
Nancy F Ozaki Trustee 431 21St Ave San Francisco CA 94121
Last sale
041299

Landlord portfolio

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

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Multiple entrances & addresses

Included addresses

All street addresses sharing this blocklot that are covered by this report.

433 21st Ave, San Francisco, CA 94121
431 21st Ave, San Francisco, CA 94121
Augrented Insights
Initial analysis

The two-unit residential building at 431-433 21st Avenue in San Francisco's Central Richmond neighborhood is a two-story flats and duplex structure built in 1924, currently owned by the Nancy F Ozaki 2000 Living Trust. The property has undergone several significant maintenance and repair projects over the past few decades, with the most recent major work being a $12,500 reroofing project initiated in January 2021. Other notable improvements include a substantial $24,000 siding replacement project completed in 2013, back steps repair and structural reinforcement work from 2001, and a post-beam connection reinforcement project completed in 2005. The building's maintenance history shows regular upkeep of critical systems, with three roofing projects recorded between 2002 and 2021, suggesting attention to maintaining weather protection.

The property has experienced various street-level issues in recent years, with multiple 311 calls regarding sidewalk and street conditions, though these external matters don't directly reflect on the building's internal condition or management. Recent incidents in 2024 included reports of garbage and debris, with one case involving human waste or urine, while earlier incidents in 2022 noted hazardous materials. The building's parking situation has generated several enforcement calls between 2019 and 2021, primarily regarding sidewalk parking violations which were addressed by parking enforcement officers. The property's maintenance record and building permits demonstrate regular structural upkeep, though the concentration of exterior-related 311 calls in recent years (particularly 2024) merits attention as part of the property's environmental context.

AI-generated · may contain errors · check the source data tables below

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Risk rating

How 431-433 21St Ave'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
76th percentile

Out of 2250 buildings in this neighborhood, 540 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
88%
No DBI
violation
12%
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.

Estimated permit spend (past 7 years)

Dollar value of permits pulled at this address — large recent spend can signal deferred-maintenance catch-up.

Building permits, owner's portfolio

Permits pulled across all of this owner's buildings over 7 years.

Permit rate, owner's portfolio

Per-building permit rate across the owner's portfolio.

12-Month severity forecast
No violation 83.6%
Moderate concern 12.7%
Severe concern 3.7%
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

431-433 21St Ave event timeline

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

2021
Building Permit Jan 07
Reroofing
$12,500 · Issued

See all 1 events

Full history back to 2021 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 431-433 21St Ave apartments

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

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