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3724-3728 23Rd St

Noe Valley, SF 94114 3630016 6 units · 3 fl · 1890

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 Noe Valley
At or below average
avg 1.2
0
FewerMore

This building has 0 novs (7y), at or below the Noe Valley average of 1.2.

Rent & eviction protection

Is 3724-3728 23Rd 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 1890
2 or more units
6 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
Units6
Floors3
Year built1890
Total area3,240 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot3630016
Ownership

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

Owner name
Yan-Sin Family Trust
Mailing address
Yan Victor Kam Hei & Sin Be 675 Silver Ave San Francisco CA 94134
Last sale
010606

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.

3724 23rd St, San Francisco, CA 94114
3728 A 23rd St, San Francisco, CA 94114
Augrented Insights
Initial analysis

The 6-unit multi-family residential building at 3724-3728 23rd Street in Noe Valley, owned by the Yan-sin Family Trust, is a 3-story structure built in 1890 that has undergone several significant safety and structural improvements over the past two decades. Most notably, in 2014, the building completed a mandatory soft-story retrofit that included new shear walls and foundation work, though it is currently listed as Non-Compliant under the Tier 3 Soft Story program. The building has received recent upgrades to its fire safety systems, with a voluntary fire alarm system upgrade in 2022 and the installation of low-frequency sounders in sleeping areas in 2021 to meet current safety standards.

The property has a history of structural maintenance and safety compliance issues that have been addressed over time. In 2004, the building faced multiple violations all filed on May 7th, including repairs needed for stairs, fire safety concerns, window maintenance, and other security requirements, though these were all successfully abated by August 9, 2004. Structural work in 2009 replaced floor joists and added steel beams at the second floor, while 2014 saw comprehensive structural improvements. There have been occasional maintenance matters, such as dry rot repairs in 2004 and a 2009 complaint regarding fire extinguisher maintenance and peeling paint, both of which were resolved. Recent 311 calls in 2023 primarily concerned street-related issues rather than building-specific problems, with one notable case in January 2020 regarding a sewage backup that was promptly addressed. The building's ongoing commitment to addressing safety concerns is evidenced by recent fire alarm system upgrades and historical compliance with major structural requirements, though the current soft-story non-compliance status remains a notable exception.

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

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Risk rating

How 3724-3728 23Rd 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

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
41th percentile

Out of 1879 buildings in this neighborhood, 1109 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
70%
No DBI
violation
30%
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.

Estimated permit spend (past 7 years)

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

12-Month severity forecast
No violation 51.4%
Moderate concern 30.8%
Severe concern 17.8%
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

3724-3728 23Rd St event timeline

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

2026
311 Request May 16
Homelessness and supportive housing
housing homeless request for service
DBI ComplaintJan 30
Date last observed: 29-jan-26; time last observed: may 2025; identity of person performing the work: ami; floor: 2nd; unit: d; exact location: main bldg; building type: residence/dwelling mold; ; additional information: i observed corrosion and organic growth around windows. i attempted to mitigate it by painting, but i am concerned about structural dampness behind the moldings/black mold. i would like a housing inspector to conduct a site visit to check for code violations related to weather-proofing and habitability.;

See all 7 events

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

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Every record we have

Full data for 3724-3728 23Rd St 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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