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1255-1257 20Th Ave

Central Sunset, SF 94122 1730011 3 units · 2 fl · 1912

This building has more problems than most buildings in this neighborhood. 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 1255-1257 20Th 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 1912
2 or more units
3 units
Property type
Multi-Family Residential
Zoning
RM1
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
Units3
Floors2
Year built1912
Total area3,240 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot1730011
Ownership

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

Owner name
Chan Family Trust
Mailing address
Kenneth K F & Jackie C Chan 2476 Butternut Dr Hillsborough CA 94010
Last sale
040600

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.

1257 20th Ave, San Francisco, CA 94122
1255 20th Ave, San Francisco, CA 94122
1257 A 20th Ave, San Francisco, CA 94122
Augrented Insights
Initial analysis

The property at 1255-1257 20th Avenue in San Francisco's Central Sunset neighborhood is a 2-story multi-family residential building constructed in 1912, containing three units and currently owned by the Chan Family Trust. The building has undergone several significant improvements over the years, most notably in 2005 when foundation upgrades were completed for both the main building and a detached structure at the rear of the lot, with electrical work involving the installation of a concrete-encased electrode system. Historical records show two notable complaints: a December 1999 incident involving heating and electrical wiring issues (resolved by January 2000), and a December 1994 situation regarding unauthorized roof work and water damage affecting interior plaster and carpets (resolved by the end of the same month).

Of particular note is a concerning pattern of maintenance issues appearing in 2024, with ten documented cases between March and January 2025 involving reports of garbage and debris, including multiple instances of abandoned furniture and loose yard waste. While these recent 311 calls have all been marked as resolved, they suggest recurring challenges with property maintenance and waste management in the vicinity. The building's maintenance history shows that while significant structural improvements were made in 2005, there are no recent records of major building permits or system upgrades, and the only expired permit on file dates back to 1985 for kitchen cabinet and drywall work.

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

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Risk rating

How 1255-1257 20Th 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
29th percentile

Out of 814 buildings in this neighborhood, 578 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
79%
No DBI
violation
21%
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.

DBI complaints, owner's portfolio

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

Estimated permit spend (past 7 years)

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

Owner's portfolio size

Number of SF parcels this owner is registered on — larger portfolios have distinct risk patterns.

12-Month severity forecast
No violation 63.7%
Moderate concern 21.1%
Severe concern 15.2%
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

1255-1257 20Th Ave event timeline

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

2024
311 Request May 31
Bulky items
Boxed or Bagged Items

See all 1 events

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

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Every record we have

Full data for 1255-1257 20Th Ave apartments

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

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