Free SF apartment background check

378 28Th St

Noe Valley, SF 94131 6602021 2 units · 2 fl · 1910

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 Noe Valley
At or below average
avg 1.2
0
FewerMore

This building has 0 novs (7y), at or below the Noe Valley average of 1.2.

Rent & eviction protection

Is 378 28Th 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 1910
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 built1910
Total area2,490 sq ft
Property typeMulti-Family Residential
Tax statusHome Owners
Blocklot6602021
Ownership

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

Owner name
Tiansay Family Revoc Trust
Mailing address
Raul S & Ruth Lai Tiansay, 378 28Th St San Francisco CA 94131
Last sale
032415

Landlord portfolio

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

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Augrented Insights
Initial analysis

The two-unit residential building at 378 28th Street in Noe Valley, owned by the Tiansay Family Revoc Trust, has undergone several significant renovations since its construction in 1910. The most recent major upgrade was the installation of a new fireplace gas appliance in 2022, replacing an existing one at a cost of $20,000. Between 2002 and 2010, substantial improvements were made to the property, including a proposed conversion of rental areas, ground floor additions, and extensive kitchen and bathroom remodels, with the electrical system receiving significant upgrades in 2003 through rewiring both units and installing new 200-amp service. However, there are some concerning recent maintenance issues; notably, there have been three sewer discharge incidents from the side sewer vent between November 2023 and December 2024, suggesting possible ongoing plumbing challenges. Additional infrastructure work included the installation of a new gas furnace in 2010, bathroom and kitchen remodeling, and new electrical wiring and fixtures. The property has experienced some environmental issues, with a tree reported in 2022 as damaging property by lifting sidewalk through root growth, though this remains an open case. The building's history includes a resolved case of illegal short-term rental activity, which was abated.

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

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Risk rating

How 378 28Th 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
88th percentile

Out of 1879 buildings in this neighborhood, 225 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
90%
No DBI
violation
10%
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 size

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

12-Month severity forecast
No violation 86.8%
Moderate concern 9.7%
Severe concern 3.5%
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

378 28Th St event timeline

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

2022
Building Permit Aug 11
Install new fireplace gas appliance to replace existing.
$20,000 · Complete
Plumbing PermitAug 04
Work category: 1m; install a direct vent gas fireplace per manual specs. gas line by others.

See all 2 events

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

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Every record we have

Full data for 378 28Th St 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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