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659-661 5Th Ave

Inner Richmond, SF 94118 1639014 2 units · 2 fl · 1907

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 Inner Richmond
At or below average
avg 0.9
0
FewerMore

This building has 0 novs (7y), at or below the Inner Richmond average of 0.9.

Rent & eviction protection

Is 659-661 5Th 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 1907
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 built1907
Total area2,330 sq ft
Property typeMulti-Family Residential
Tax statusHome Owners
Blocklot1639014
Ownership

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

Owner name
Mau Sen Ng Bypass Tr
Mailing address
Wun Fung Ng Trustee 661 5Th Ave San Francisco CA 94118
Last sale
092397

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.

659 05th Ave, San Francisco, CA 94118
661 05th Ave, San Francisco, CA 94118
Augrented Insights
Initial analysis

The two-unit residential building at 659-661 5th Avenue in San Francisco's Inner Richmond district is a two-story flats and duplex structure built in 1907, currently owned by Mau Sen Ng Bypass Tr. The building's maintenance records show regular attention to the roof, with significant work performed in 2017 costing $14,950, though an earlier re-roofing project was completed in 1990. Of particular concern is an active plumbing violation dating back to December 2003 regarding improper rainwater drainage affecting the neighboring property at 665 5th Avenue, which remains unresolved nearly two decades later.

In recent years, the property has experienced numerous parking-related issues, with multiple complaints recorded between 2022 and 2024 regarding blocked driveways. While many of these incidents resulted in citations being issued, there were several cases where enforcement officers were unable to locate the offending vehicles. Most recently, in November 2024, there were reports of a missing side sewer vent cover, though this was only recently reported and remains open. The property has also had occasional issues with hazardous materials on or near the sidewalk, with a glass-related incident reported and resolved in August 2023. The building's most recent documented work, the roof replacement, was completed in accordance with planning requirements, confirming that the work performed was limited to roof maintenance with no other modifications affecting visibility from the street.

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

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Risk rating

How 659-661 5Th 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
75th percentile

Out of 1723 buildings in this neighborhood, 431 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
88%
No DBI
violation
12%
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.

Estimated permit spend (past 7 years)

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

Building permits, owner's portfolio

Permits pulled across all of this owner's buildings 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 79.9%
Moderate concern 14.0%
Severe concern 6.0%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months at each severity level. Model: full_hgb_balanced.
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The story over time

659-661 5Th Ave event timeline

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

No dated public records on file yet.
Every record we have

Full data for 659-661 5Th 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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