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577 27Th Ave

Central Richmond, SF 94121 1517010 4 units · 2 fl · 1973

This building has far more open problems than almost any other in the neighborhood. A handful of unresolved issues. Worth a careful walk-through and pointed questions.

NOVs (7y) vs. neighborhood
Compared to a typical building in Central Richmond
Above average
avg 0.5
11
FewerMore

This building has 11 novs (7y), above the Central Richmond average of 0.5.

Rent & eviction protection

Is 577 27Th 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 1973
2 or more units
4 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
Units4
Floors2
Year built1973
Total area3,904 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot1517010
Ownership

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

Owner name
Lew Yew Tang & Ngan Heung N
Mailing address
Yew Tan&ngan Heung Ng Lew 951 Duncan St San Francisco CA 94131
Last sale
021799

Landlord portfolio

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

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Augrented Insights
Initial analysis

The two-story multi-family residential building at 577 27th Ave in the Central Richmond neighborhood was constructed in 1973 and contains four units. The property has undergone some significant maintenance work over the years, including a completed reroofing project in 1993. More recently, in August 2019, a series of building violations were documented that affected resident safety and comfort, including issues with door locks, cabinets, carbon monoxide/smoke detectors, a malfunctioning bathtub, furnace problems, closet doors, and kitchen appliances. These violations were all addressed and abated by November 21, 2019. In August 2020, there was a complaint about construction noise exceeding permitted hours, which was resolved by December 2021.

The building's recent history shows consistent monitoring and addressing of maintenance issues, though there have been multiple parking-related incidents in the vicinity, with several citations issued between 2018 and 2020 for vehicles blocking driveways or parking on sidewalks. The property experienced some infrastructure issues in 2017 with a sewage backup that was resolved promptly. The most recent activity related to the property was a rent board fee and housing inventory request in January 2024, which was resolved with a voicemail communication. The building's maintenance record shows a pattern of addressing violations and complaints, though the 2019 violations indicated a period of deferred maintenance that was subsequently corrected.

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

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Risk rating

How 577 27Th 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
7th percentile

Out of 2250 buildings in this neighborhood, 2092 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
48%
No DBI
violation
52%
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.

NOV rate, owner's portfolio

Per-building NOV rate across everything this owner manages — high rates signal pattern neglect.

DBI tenant complaints (past 7 years)

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

12-Month severity forecast
No violation 47.4%
Moderate concern 29.6%
Severe concern 23.0%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months at each severity level. Model: full_hgb_balanced.
Apartment reviews

577 27Th Ave apartment reviews

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The story over time

577 27Th Ave event timeline

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

2020
DBI Complaint Aug 07
577 27th ave --- private construction project that is very loud and has been in progress beyond 8:00 pm for the last 2 nights (311 sr#12744068)
Building Inspection Division

See all 7 events

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

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Every record we have

Full data for 577 27Th 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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