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1250 21St Ave

Central Sunset, SF 94122 1730033 2 units · 3 fl · 1986

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 Sunset
At or below average
avg 0.7
0
FewerMore

This building has 0 novs (7y), at or below the Central Sunset average of 0.7.

Rent & eviction protection

Is 1250 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 1986
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.

Building characteristics
Units2
Floors3
Year built1986
Total area5,565 sq ft
Property typeMulti-Family Residential
Tax statusHome Owners
Blocklot1730033
Ownership

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

Owner name
Wong Trinh Family Trust
Mailing address
Wong Better K P Ttee 1250 21St Ave San Francisco CA 94122
Last sale
091416

Landlord portfolio

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

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Augrented Insights
Initial analysis

The Wong Trinh Family Trust owns this three-story, two-unit multi-family residential building located at 1250 21st Avenue in San Francisco's Central Sunset neighborhood. Built in 1986, the building's permit history shows significant activity in 1984, including completed permits for a new addition and alterations, along with revisions to replace part of the east side wall interior bearing. More recently, in 2017, there was an attempt to legalize a first-floor unit per Ordinance 43-14, but this permit was ultimately cancelled.

The property has experienced several maintenance and infrastructure issues over the past few years, with particular concern regarding sewer systems. There were two notable sewer-related incidents in 2017, including a sewage backup incident in November and a flooding issue in February 2021. The building's location has faced recurring challenges with parking-related disturbances, evidenced by multiple complaints between 2021-2022 regarding driveway blocking, though enforcement responses varied in their outcomes. Other incidents include a noise complaint in March 2021 regarding amplified sound electronics, and various street cleaning and public works-related matters such as a 2017 report of human or animal waste. The property has undergone some community servicing interactions, including a 2019 request related to Jump Bike services, though this was not directly related to building conditions. While the building's permits indicate structural improvements were made in its early years, the more recent history shows attention required for both unit legalization efforts and recurring infrastructure maintenance issues.

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

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Risk rating

How 1250 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
75th percentile

Out of 814 buildings in this neighborhood, 204 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.

Building size

Total floor area — a proxy for building scale and the number of systems (plumbing, electrical, HVAC) that can fail.

Estimated permit spend (past 7 years)

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

Construction spend, owner's portfolio

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

12-Month severity forecast
No violation 85.3%
Moderate concern 9.3%
Severe concern 5.3%
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

1250 21St Ave event timeline

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

No dated public records on file yet.
Every record we have

Full data for 1250 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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Cancel anytime · Data sourced from SF Open Data, DBI, SFFD, SF Rent Board & Planning

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