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3641-3643 26Th St

Inner Mission, SF 94110 6568018 2 units · 2 fl · 1926

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 Inner Mission
At or below average
avg 2.6
0
FewerMore

This building has 0 novs (7y), at or below the Inner Mission average of 2.6.

Rent & eviction protection

Is 3641-3643 26Th 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 1926
2 or more units
2 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
Units2
Floors2
Year built1926
Total area2,230 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot6568018
Ownership

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

Owner name
Ryan T Sieroty Intervivos T
Mailing address
Ryan T Sieroty, Trustee 3643 26Th St San Francisco CA 94110
Last sale
110210

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.

3643 26th St, San Francisco, CA 94110
3641 26th St, San Francisco, CA 94110
Augrented Insights
Initial analysis

The property at 3641-3643 26th St is a two-unit, two-story multi-family residential building located in San Francisco's Inner Mission neighborhood. Built in 1926, this flats and duplex-style building has undergone several significant renovations over the years, with substantial work completed in 2000 including bathroom and kitchen remodels, termite repairs, and various other improvements totaling over $100,000. Additional notable improvements from 1990 included the installation of vinyl siding on three walls, and specifically for 3643 26th St, the replacement of the rear deck and stairs along with window upgrades.

The building has experienced some maintenance challenges, most notably a mold issue with ceiling leaks reported in 2018, though this complaint is currently listed as "Not Active" with Housing Inspection Services. From 2010, there is a record of completed sewer repairs. More recently, there have been recurring issues with parking enforcement near the property, with multiple citations issued for driveway blocking between 2021 and 2024. The building's immediate vicinity has experienced various urban challenges typical of the neighborhood, including reports of abandoned vehicles, waste issues, and noise complaints, though these are more reflective of the neighborhood environment rather than building-specific concerns. While the property has maintained its structural integrity with regular updates, the documented complaints and recurring parking issues suggest ongoing challenges with maintenance and neighborhood interactions.

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

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Risk rating

How 3641-3643 26Th 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 2380 buildings in this neighborhood, 286 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
83%
No DBI
violation
17%
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.

Neighborhood (ZIP code)

The ZIP code captures local housing market and enforcement patterns that affect all buildings in the area.

Building permits, owner's portfolio

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

12-Month severity forecast
No violation 82.8%
Moderate concern 10.8%
Severe concern 6.5%
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

3641-3643 26Th St event timeline

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

2025
Building Permit Aug 04
Re-roof. tear off old roof membrane and install new modified bitumen. no hot work.
$10,000 · Complete
311 RequestJun 20
Garbage and debris

See all 3 events

Full history back to 2023 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 3641-3643 26Th St apartments

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

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