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55-57 Cotter St

Mission Terrace, SF 94112 6797036 2 units · 2 fl · 1916

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 Mission Terrace
At or below average
avg 2.3
0
FewerMore

This building has 0 novs (7y), at or below the Mission Terrace average of 2.3.

Rent & eviction protection

Is 55-57 Cotter 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 1916
2 or more units
2 units
Property type
Multi-Family Residential
Zoning
RH1
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 built1916
Total area1,940 sq ft
Property typeMulti-Family Residential
Tax statusHome Owners
Blocklot6797036
Ownership

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

Owner name
Siu Weng Hong & Wu Qi Lin
Mailing address
55 Cotter St San Francisco CA 94112
Last sale
051817

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.

57 Cotter St, San Francisco, CA 94112
55 Cotter St, San Francisco, CA 94112
Augrented Insights
Initial analysis

The two-unit residential building at 55-57 Cotter Street in Mission Terrace, owned by Siu Weng Hong & Wu Qi Lin, is a two-story flats and duplex structure built in 1916. The property has undergone several significant improvements and maintenance work over the past two decades, with the most recent major work being a service weather head replacement completed in October 2024. The building experienced notable plumbing and structural challenges between 2009-2011, including water damage in the basement that led to multiple violations in January 2010, requiring repairs to the concrete floor and foundation, and resulting in fines for various code violations including unpermitted water heater installations and water damage issues. These violations were all officially abated by September 2011.

Subsequent improvements have included bathroom remodels, deck expansion, foundation repairs, and comprehensive electrical system upgrades, including service panel upgrades in 2010-2011. The property has maintained active compliance with building codes since 2011, with no active violations on record. Recent property management has focused on routine maintenance and improvements, including the installation of smoke detectors and bathroom ventilation systems. The building's surroundings have experienced some neighborhood maintenance issues in 2024, as evidenced by multiple reports of sidewalk defects and garbage concerns, though these are street-level issues outside the building's direct control. The property's maintenance history shows a pattern of addressing both routine upkeep and substantial improvements, particularly focusing on infrastructure upgrades and repairs since resolving the earlier water damage issues.

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

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Risk rating

How 55-57 Cotter 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
66th percentile

Out of 149 buildings in this neighborhood, 51 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
72%
No DBI
violation
28%
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.

Building age

Older buildings tend to have more maintenance challenges; SF's pre-1906 earthquake housing stock carries distinct risk.

Construction spend, owner's portfolio

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

12-Month severity forecast
No violation 67.5%
Moderate concern 18.1%
Severe concern 14.4%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months at each severity level. Model: full_hgb_balanced.
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The story over time

55-57 Cotter St event timeline

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

2024
Electrical Permit Oct 18
Service weather head replacement for service entrance
Complete

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Full history back to 2024 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 55-57 Cotter St apartments

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

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