Free SF apartment background check

400-402 Warren Dr

Forest Knolls, SF 94131 2635043 12 units · 2 fl · 1961

A handful of records on file over the last seven years, and our model predicts a high risk of further maintenance problems in the next 12 months. A few records worth reading before you sign. Check whether they were closed out, and ask what was actually fixed.

NOVs (7y) vs. neighborhood
Records already on file, against a typical building in Forest Knolls — not a forecast
At or below average
avg 1.7
0
FewerMore

This building has 0 novs (7y), at or below the Forest Knolls average of 1.7.

The bar and the rating point different ways because they measure different things: the bar counts DBI violations already on file, the rating forecasts the next 12 months.

Rent & eviction protection

Is 400-402 Warren Dr 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 1961
2 or more units
12 units
Property type
Multi-Family Residential
Zoning
RM4
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.

Statewide backstop · AB 1482

California Tenant Protection Act of 2019

Even when a building isn't covered by local rent stabilization, the statewide Tenant Protection Act (AB 1482) may still apply. It caps annual rent increases and requires the landlord to state a legal reason to end most tenancies.

15+ years since occupancy
Built 1961
Annual rent increase cap
5% + CPI, max 10%
Just-cause eviction
After 12 months
Local rent control likely takes priority. This building appears to fall under the local ordinance above, which is stronger than AB 1482. Where a local just-cause ordinance applies, its rules govern instead of the state cap.

AB 1482 does not apply to single-family homes and condos unless owned by a corporation, REIT, or an LLC with a corporate member; to owner-occupied duplexes; or to deed-restricted affordable housing. The Act is in effect until January 1, 2030. Not legal advice — see the California landlord–tenant guide.

Building characteristics
Units12
Floors2
Year built1961
Total area8,926 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot2635043
Ownership

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

Owner name
Mailing address
Brit Hahn 5214 F Diamond Heights #125 San Francisco CA 94131
Last sale
March 30, 2007

Landlord portfolio

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

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Multiple entrances & addresses

Included addresses

All street addresses sharing this blocklot that are covered by this report.

400 Warren Dr, San Francisco, CA 94131
402 Warren Dr, San Francisco, CA 94131
Augrented Insights
Initial analysis

The 12-unit, 2-story apartment building at 400-402 Warren Drive in Forest Knolls, owned by 525 Howard LLC, has undergone several significant structural improvements since its construction in 1961. The most notable recent work was the completion of mandatory soft-story retrofitting in 2018, which included the installation of front steel moment frames around garage doors at a cost of $90,000. Other major maintenance work included reroofing projects in 2000 ($8,380), 2006 ($11,880), and 1989, as well as the installation of a Ufer ground system in 2019.

The building has experienced several maintenance and safety issues over its history, with the most serious incident occurring in 2000 when there was a landslide at the rear of the property that created hazardous conditions, leading to a violation notice and subsequent abatement process that was completed in 2003. A routine housing inspection in 2003 revealed multiple safety concerns, including blocked exits, combustible materials in parking spaces, egress obstructions, and inadequate gas shutoff tools, all of which were abated by August 2003. More recent concerns include a blocked exit in 2019 (corrected) and two fire-related incidents in 2024. The building has experienced several routine housing inspections over the years (most recently in 2018), and it is classified as Tier 3 for soft-story compliance with all required work completed.

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

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Risk rating

How 400-402 Warren Dr'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

Lower risk — safer than most nearby

DBI rarely finds violations here. Strong maintenance history and a clean complaint record.

Typical — about average for the neighborhood

Some past violations or complaints on record. Worth asking the landlord about any open issues before signing.

Higher risk — riskier than most nearby

Elevated violation and complaint history. DBI has found issues here before and is statistically likely to again.

Neighborhood percentile
14thpercentile

Out of 50 buildings in this neighborhood, 43 are predicted to be safer. The band is relative to this neighborhood, so a share of every neighborhood falls in each colour.

RiskiestSafest
Predicted 12-month outcome
35%
No DBI
violation
65%
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.

Building size

Total floor area — a proxy for building scale and the number of systems (plumbing, electrical, HVAC) that can fail.

12-Month risk forecast
High failure risk 65%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months. Model: full_hgb_balanced.
Apartment reviews

400-402 Warren Dr apartment reviews

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On the map

Compare nearby alternatives

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Buildings nearby
8 found
The story over time

400-402 Warren Dr event timeline

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

2026
Fire Complaint Jul 24
Fire Escape

See all 2 events

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

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Every record we have

Full data for 400-402 Warren Dr apartments

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

Side by side

How 400-402 Warren Dr compares to the neighborhood

This building against comparable properties in Forest Knolls. Toggle filters to narrow the peer group.

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