Free SF apartment background check

631-633 Frederick St

Cole Valley/Parnassus Heights, SF 94117 1265029 5 units · 2 fl · 1909

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 Cole Valley/Parnassus Heights
At or below average
avg 0.9
0
FewerMore

This building has 0 novs (7y), at or below the Cole Valley/Parnassus Heights average of 0.9.

Rent & eviction protection

Is 631-633 Frederick 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 1909
2 or more units
5 units
Property type
Multi-Family Residential
Zoning
RH3
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
Units5
Floors2
Year built1909
Total area2,640 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot1265029
Ownership

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

Owner name
Ronald & Jeannie Ma Yee Fml
Mailing address
100 Forest Knolls Dr San Francisco CA 94131
Last sale
030510

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.

633 Frederick St, San Francisco, CA 94117
631 Frederick St, San Francisco, CA 94117
Augrented Insights
Initial analysis

The two-story multi-family residential building at 631-633 Frederick St, owned by Ronald & Jeannie Ma Yee Fml, was constructed in 1909 and contains 5 units. The property underwent a mandatory seismic retrofit in 2014 as part of its Tier 3 Soft Story program, with comprehensive improvements including foundation bolting, wall reinforcement, and installation of plywood sheathing, completed at a cost of $30,000. The building has a history of maintenance issues, with multiple roof replacements documented between 2000-2005, and some concerning recent complaints; most notably an active 2022 complaint regarding original windows, sealing issues, and mold problems. The building experienced several violations in 2003 that were subsequently addressed, including fire proofing repairs, stair repairs, and installation of self-closing devices on exterior doors.

Recent maintenance records show ongoing care for the property, including tree maintenance issues in 2024 and various street cleaning matters through 2025. The building has had two fire-related service calls in recent years, though neither resulted in civilian injuries or significant incidents. Historical renovation work includes interior updates from the 1990s, such as kitchen cabinet replacements and bathroom renovations. The property's most pressing current issue appears to be the active 2022 complaint regarding windows and mold, while historical records show periodic maintenance issues typical for a building of its age and type.

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

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Risk rating

How 631-633 Frederick 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
15th percentile

Out of 526 buildings in this neighborhood, 447 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
57%
No DBI
violation
43%
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.

DBI tenant complaints (past 7 years)

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

Permit rate, owner's portfolio

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

12-Month severity forecast
No violation 57.5%
Moderate concern 25.1%
Severe concern 17.4%
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

631-633 Frederick St event timeline

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

2022
DBI Complaint Dec 27
Caller states the windows maybe original from the building. one does not open. sealed by the landlord. there is also mold throughout the whole unit, and a possible leak.
Housing Inspection Services

See all 1 events

Full history back to 2022 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 631-633 Frederick St apartments

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

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