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3840-3842 23Rd St

Noe Valley, SF 94114 3628016A 2 units · 2 fl · 1941

Nothing on record for this building in the last seven years, and our model puts it at a low risk of maintenance problems over the next 12 months. No public enforcement record to go on. Walk the building, ask the current tenants how repairs get handled, and get any promises in writing.

NOVs (7y) vs. neighborhood
Records already on file, against a typical building in Noe Valley — not a forecast
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 3840-3842 23Rd 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 1941
2 or more units
2 units
Property type
Multi-Family Residential
Zoning
RM3
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 1941
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
Units2
Floors2
Year built1941
Total area1,750 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot3628016A
Ownership

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

Mailing address
Robert J Bianchi 116 Aster Rd San Carlos CA 94070
Last sale

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.

3842 23rd St, San Francisco, CA 94114
3840 23rd St, San Francisco, CA 94114
Augrented Insights
Initial analysis

The property at 3840-3842 23rd Street in Noe Valley is a two-unit, two-story multi-family residential building constructed in 1941, currently owned by the Robert J Bianchi Revoc Tr. The building has undergone several maintenance and repair projects over the past 25 years, with the most recent significant work being a reroofing project completed in 2017 at a cost of $6,000. In 1998, the property experienced multiple safety and maintenance issues, including a serious electrical hazard with a fuse box, shock from outlets, and open wiring in the basement (resolved in 2013), as well as significant plumbing problems including sewerage issues in the garage, bathroom remodeling without proper permits, and a hazardous rear staircase. These historical issues were addressed through multiple completed permits and investigations.

More recent records from 2022 to 2024 show recurring issues with parking enforcement, particularly regarding blocked driveways, with multiple citations issued. There are also current open concerns as of 2024 regarding pavement defects and landscaping issues. The property has experienced some routine neighborhood issues, including graffiti in 2023 and occasional garbage debris concerns, though these appear to be promptly addressed. While the building has a history of significant safety concerns from the late 1990s, there have been no recorded building complaints or major safety issues in recent years, and the property has undergone regular maintenance, including the substantial roof replacement in 2017.

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

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Risk rating

How 3840-3842 23Rd 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

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
88thpercentile

Out of 1879 buildings in this neighborhood, 225 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
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.

Neighborhood location

Precise location is a proxy for neighborhood-level risk — some SF blocks have systematically higher DBI activity.

Construction spend, owner's portfolio

Estimated permit value across all of this owner's buildings.

Building permits, owner's portfolio

Permits pulled across all of this owner's buildings over 7 years.

12-Month risk forecast
Low failure risk 10%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months. Model: full_hgb_balanced.
Apartment reviews

3840-3842 23Rd St apartment reviews

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On the map

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The story over time

3840-3842 23Rd St event timeline

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

2025
311 Request Feb 11
Encampment
Encampment

See all 2 events

Full history back to 2021 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 3840-3842 23Rd St apartments

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

Side by side

How 3840-3842 23Rd St compares to the neighborhood

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Cancel anytime · Data sourced from SF Open Data, DBI, SFFD, SF Rent Board & Planning

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