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634-636 24Th Ave

Central Richmond, SF 94121 1566030 2 units · 2 fl · 1914

This building has significantly more problems than most nearby buildings. 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 Richmond
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 634-636 24Th 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 1914
2 or more units
2 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
Units2
Floors2
Year built1914
Total area1,700 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot1566030
Ownership

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

Owner name
Moy San & Chui Yau Ng Revoc
Mailing address
Huang Su Chang Succ Trustee 621 129Th Pl Ne Bellevue WA 98005
Last sale
102094

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.

636 24th Ave, San Francisco, CA 94121
634 24th Ave, San Francisco, CA 94121
Augrented Insights
Initial analysis

The two-unit residential building at 634-636 24th Avenue in San Francisco's Central Richmond neighborhood has a century-long history dating back to its 1914 construction. The property has faced several regulatory challenges, most notably a series of violations in 2013-2014 regarding unauthorized structures in the rear yard, including a gazebo, which required multiple notices of violation and municipal intervention before being resolved. Additional compliance issues were documented in 2018 regarding an unauthorized fence structure. More recently, a complaint was filed in July 2023 about an illegal steel shed in the backyard, which remains as an active issue. The building has undergone several legitimate improvements over the years, including a kitchen remodel in 1996 and repairs to earthquake-damaged front stairs in 1989. Three significant complaints about improper construction practices and safety concerns were filed between 2018-2019, including issues with electrical system access and unsafe structures in the backyard and garage. A mold issue was briefly reported and resolved in 2012, and several parking-related incidents have been documented in the vicinity of the property over the years, including multiple instances of sidewalk parking between 2017-2023. The building's historical maintenance record shows some required foundation work along the south property line in 2003, though that permit is listed as expired.

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

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Risk rating

How 634-636 24Th 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
10th percentile

Out of 2250 buildings in this neighborhood, 2025 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
58%
No DBI
violation
42%
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 complaint rate, owner's portfolio

Per-building complaint rate across the owner's portfolio.

DBI tenant complaints (past 7 years)

Formal complaints tenants filed with DBI about this building over 7 years.

Building age

Older buildings tend to have more maintenance challenges; SF's pre-1906 earthquake housing stock carries distinct risk.

12-Month severity forecast
No violation 40.0%
Moderate concern 43.5%
Severe concern 16.6%
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

634-636 24Th Ave event timeline

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

2023
DBI Complaint Jul 31
Date last observed: 29-jul-23; time last observed: 2pm; identity of person performing the work: unknown; floor: ground; unit: illegal st; exact location: rear bldg; building type: residence/dwelling illegal unit; work w/o permit; illegal change of use; other building; ; additional information: backyard has a steel shed 12”x20” and other structure;
Building Inspection Division
311 RequestApr 04
Parking on sidewalk

See all 3 events

Full history back to 2019 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 634-636 24Th 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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