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4340-4342 California St

Lake Street, SF 94118 1365018 6 units · 3 fl · 1910

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 Lake Street
Above average
avg 0.6
15
FewerMore

This building has 15 novs (7y), above the Lake Street average of 0.6.

Rent & eviction protection

Is 4340-4342 California 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
6 units
Property type
Multi-Family Residential
Zoning
NC1
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
Units6
Floors3
Year built1910
Total area5,170 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot1365018
Ownership

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

Owner name
Sebastian F Colabianchi Fml
Mailing address
Colabianchi Sebastian F Mem 2819 Arguello Dr Burlingame CA 94010
Last sale
092705

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.

4342 A California St, San Francisco, CA 94118
4340 California St, San Francisco, CA 94118
4342 California St, San Francisco, CA 94118
Augrented Insights
Initial analysis

The 4340-4342 California Street property is a 3-story multi-family residential building constructed in 1910, containing 6 units and currently owned by Sebastian F Colabianchi Fml. The building underwent significant seismic safety improvements in 2023, completing residential and commercial soft-story mitigation work with moment frame installations at a cost of $50,000 each, achieving compliance with current safety standards. Building violations from October 2016 remain active and documented as a "nuisance property," including issues with lead paint hazards, egress obstructions, garbage accumulation, and fire safety concerns regarding sprinkler requirements for garbage storage areas. Additional complaints about plumbing violations involving unpermitted water heaters and various sanitation issues have persisted since 2016.

Recent maintenance concerns have included a damaged window in Unit #5 (resolved by June 2023) and ongoing issues with doorbells and water accumulation around electrical breakers (an active complaint from February 2023). The property has a history of shared spaces violations (most recently in 2022-2023) and multiple fire code issues requiring corrections, though some violations have been abated or rescinded. The building's mechanical systems received updates in 2016, including water heater replacements and plumbing fixture relocations, while the ground-floor commercial space underwent tenant improvements in 2016 to improve accessibility and facilities. Historical permits show various maintenance work, including reroofing in 2005 and multiple soft-story retrofit attempts, with the most recent successful completion bringing the building into compliance with seismic safety requirements.

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

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Risk rating

How 4340-4342 California 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 660 buildings in this neighborhood, 561 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
60%
No DBI
violation
40%
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.

NOV rate, owner's portfolio

Per-building NOV rate across everything this owner manages — high rates signal pattern neglect.

12-Month severity forecast
No violation 21.1%
Moderate concern 37.2%
Severe concern 41.8%
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

4340-4342 California St event timeline

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

2024
Fire Complaint Dec 31
Operating Without A Permit
Condition Corrected
Fire ComplaintDec 31
Uncategorized Complaint

See all 17 events

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

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Every record we have

Full data for 4340-4342 California 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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