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525-527 21St Ave

Central Richmond, SF 94121 1564003 2 units · 2 fl · 1979

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 Central Richmond — not a forecast
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 525-527 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 1979
2 or more units
2 units
Property type
Multi-Family Residential
Zoning
RH2
Not rent-controlled. Buildings constructed after 1978 are generally exempt from SF rent increase limits under the Costa-Hawkins Act.

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 1979
Annual rent increase cap
5% + CPI, max 10%
Just-cause eviction
After 12 months
May be covered by AB 1482. The building is old enough for the statewide rent cap (5% + regional CPI, capped at 10% per year) and just-cause protection after 12 months of tenancy.

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
Units2
Floors2
Year built1979
Total area3,510 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot1564003
Ownership

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

Mailing address
Betty Wong Trustee 527 21St Ave San Francisco CA 94121
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.

525 21st Ave, San Francisco, CA 94121
527 21st Ave, San Francisco, CA 94121
Augrented Insights
Initial analysis

The two-story multi-family residential building at 525-527 21st Avenue in San Francisco's Central Richmond neighborhood, owned by the Betty Wong Revocable Trust, was constructed in 1979 and consists of two units under the Flats & Duplex classification. The building's structural history includes significant work in 2004, when underpinning of the south side foundation was completed at a cost of $5,000 to address stability concerns related to adjacent excavation work. A notable incident occurred in July 2005, when building demolition work generated two complaints regarding visual exposure of the first floor, though these complaints were promptly addressed within one day.

More recently, the property has experienced recurring issues with tree root damage to the sidewalk area, with three open reports (in September 2023, January 2024, and most recently in April 2024) related to this maintenance concern, all of which were handled through the Department of Public Works Operations. Additionally, there was one parking enforcement complaint in August 2019 regarding vehicles on the sidewalk, though responding officers were unable to locate the offending vehicle. The relatively minimal number of complaints and issues over the building's history, particularly focusing on infrastructure maintenance and tree-related concerns rather than structural or safety issues, suggests stable living conditions, though the ongoing tree root damage remains an unresolved environmental concern affecting the property.

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

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Risk rating

How 525-527 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

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
80thpercentile

Out of 2250 buildings in this neighborhood, 450 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
89%
No DBI
violation
11%
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.

Construction spend, owner's portfolio

Estimated permit value across all of this owner's buildings.

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.

12-Month risk forecast
Low failure risk 11%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months. Model: full_hgb_balanced.
Apartment reviews

525-527 21St Ave apartment reviews

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On the map

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Buildings nearby
8 found
The story over time

525-527 21St Ave event timeline

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

2023
311 Request Sep 17
Trees - damaging property
Lifted sidewalk tree roots

See all 1 events

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

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Every record we have

Full data for 525-527 21St Ave apartments

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

Side by side

How 525-527 21St Ave compares to the neighborhood

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