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3233-3235 21St St

Inner Mission, SF 94110 3616055 4 units · 2 fl · 1900

Nothing on record for this building in the last seven years, and our model puts it at a low risk of maintenance problems over the next 12 months. No public enforcement record to go on. Walk the building, ask the current tenants how repairs get handled, and get any promises in writing.

NOVs (7y) vs. neighborhood
Records already on file, against a typical building in Inner Mission — not a forecast
At or below average
avg 2.7
0
FewerMore

This building has 0 novs (7y), at or below the Inner Mission average of 2.7.

Rent & eviction protection

Is 3233-3235 21St 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 1900
2 or more units
4 units
Property type
Multi-Family Residential
Zoning
RH3
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.

Statewide backstop · AB 1482

California Tenant Protection Act of 2019

Even when a building isn't covered by local rent stabilization, the statewide Tenant Protection Act (AB 1482) may still apply. It caps annual rent increases and requires the landlord to state a legal reason to end most tenancies.

15+ years since occupancy
Built 1900
Annual rent increase cap
5% + CPI, max 10%
Just-cause eviction
After 12 months
Local rent control likely takes priority. This building appears to fall under the local ordinance above, which is stronger than AB 1482. Where a local just-cause ordinance applies, its rules govern instead of the state cap.

AB 1482 does not apply to single-family homes and condos unless owned by a corporation, REIT, or an LLC with a corporate member; to owner-occupied duplexes; or to deed-restricted affordable housing. The Act is in effect until January 1, 2030. Not legal advice — see the California landlord–tenant guide.

Building characteristics
Units4
Floors2
Year built1900
Total area2,710 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot3616055
Ownership

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

Mailing address
Asuncion T Yap, Aka Siony T 371 Ellington Ave San Francisco CA 94112
Last sale

Landlord portfolio

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

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Multiple entrances & addresses

Included addresses

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

3235 21st St, San Francisco, CA 94110
3233 21st St, San Francisco, CA 94110
Augrented Insights
Initial analysis

The 3233-3235 21st Street property is a two-story, four-unit multi-family residential building constructed in 1900 in San Francisco's Inner Mission neighborhood, currently owned by the Yap Asuncion T Trust. The building has undergone significant recent improvements, with a major renovation completed in 2023 costing $138,000 that included remodeling three bathrooms and a kitchen, replacing windows, installing new flooring, upgrading electrical systems, and repairing entrance hallways and front stairs. The property has a documented history of maintenance and safety issues, particularly in the 2000s and early 2010s, including multiple building violations related to unpermitted stair replacements (2003), a sewage overflow incident (2006), and interior problems that required significant repairs including the replacement of plastered walls, ceilings, insulation, and kitchen cabinets (2011). Fire safety has been a recurring concern, with multiple violations and complaints regarding alarm systems, sprinkler systems, and blocked exits recorded between 2015 and 2024, though recent fire safety violations from late 2023 and 2024 have been abated.

The building's maintenance history shows regular attention to structural and safety issues, with several major electrical upgrades (2011-2023), roof replacement (2013), and stair repairs. A tenant buyout occurred in February 2023 with one tenant reportedly receiving $100,000. Recent 311 calls from 2024 have primarily concerned exterior issues such as graffiti and sidewalk defects, though these are not directly related to building safety or maintenance. The building has maintained an active maintenance record since the early 2010s, with most recent permits and violations being promptly addressed, suggesting improved management practices in recent years compared to the more problematic period of the 2000s and early 2010s.

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

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Risk rating

How 3233-3235 21St 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

Lower risk — safer than most nearby

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

Typical — about average for the neighborhood

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

Higher risk — riskier than most nearby

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

Neighborhood percentile
70thpercentile

Out of 2380 buildings in this neighborhood, 714 are predicted to be safer. The band is relative to this neighborhood, so a share of every neighborhood falls in each colour.

RiskiestSafest
Predicted 12-month outcome
76%
No DBI
violation
24%
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.

Neighborhood location

Precise location is a proxy for neighborhood-level risk — some SF blocks have systematically higher DBI activity.

Neighborhood (ZIP code)

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

12-Month risk forecast
Low failure risk 24%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months. Model: full_hgb_balanced.
Apartment reviews

3233-3235 21St St apartment reviews

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On the map

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The story over time

3233-3235 21St St event timeline

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

2025
311 Request Jul 12
Parking on sidewalk
Parking Enforcement
311 RequestJun 19
Not offensive

See all 10 events

Full history back to 2023 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 3233-3235 21St St apartments

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

Side by side

How 3233-3235 21St St compares to the neighborhood

This building against comparable properties in Inner Mission. Toggle filters to narrow the peer group.

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Cancel anytime · Data sourced from SF Open Data, DBI, SFFD, SF Rent Board & Planning

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