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455-457 23Rd Ave

Central Richmond, SF 94121 1521009 2 units · 2 fl · 1924

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 Richmond
Above average
avg 0.5
1
FewerMore

This building has 1 novs (7y), above the Central Richmond average of 0.5.

Rent & eviction protection

Is 455-457 23Rd 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 1924
2 or more units
2 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
Units2
Floors2
Year built1924
Total area2,770 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot1521009
Ownership

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

Owner name
Wu Jian Han
Mailing address
2368 Alemany Blvd San Francisco CA 94112
Last sale
033021

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.

455 23rd Ave, San Francisco, CA 94121
457 23rd Ave, San Francisco, CA 94121
Augrented Insights
Initial analysis

The property at 455-457 23rd Avenue is a 2-unit, 2-story multi-family residential building constructed in 1924, currently owned by Wu Jian Han and located in the Central Richmond neighborhood. The building has undergone significant renovations and faced several notable events over recent years. Most concerning was a fire incident in April 2017 that caused moderate fire and water damage to the front units, particularly affecting the ceiling and wall coverings of unit 457, along with water damage in the lower unit. This was followed by multiple building code violations regarding unauthorized unit conversions, including illegal kitchen installations and modifications to hallway door openings, which were eventually abated in February 2023.

The building underwent extensive renovation work between 2020 and 2022, including complete remodeling of two kitchens, laundry facilities, seven bathrooms, and electrical systems. Notable improvements included the installation of new furnaces and a tankless water heater system. However, there were several permit compliance issues, particularly concerning unauthorized modifications in 2021-2022 related to roof structures, lightwell modifications, and deck installations, which triggered multiple Notices of Violation (NOVs) requiring monitoring fees and investigations. The property has also experienced various maintenance and compliance issues, as evidenced by multiple 311 calls for sidewalk cleaning, parking violations, and graffiti removal between 2010 and 2022. All work performed under the most recent permits has been documented as completed, with final inspections for multiple permits obtained in December 2022. The building's history shows a pattern of unauthorized modifications followed by proper permitting and compliance, suggesting an ongoing effort by management to address and rectify previous violations.

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

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Risk rating

How 455-457 23Rd 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
69th percentile

Out of 2250 buildings in this neighborhood, 698 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
87%
No DBI
violation
13%
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 tenant complaints (past 7 years)

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

Neighborhood location

Precise location is a proxy for neighborhood-level risk — some SF blocks have systematically higher DBI activity.

DBI complaint rate, owner's portfolio

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

12-Month severity forecast
No violation 66.1%
Moderate concern 27.7%
Severe concern 6.3%
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

455-457 23Rd Ave event timeline

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

2022
Building Permit Dec 30
To obtain final inspection for work approved under pa's # 201912058736, 201902082531, and 202107305521. all work is complete.
$1 · Complete
Building PermitDec 30
To obtain final inspection for work approved under pa's # 201711022990 and 201811024900. all work is complete.

See all 16 events

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

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Every record we have

Full data for 455-457 23Rd Ave apartments

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

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