Free SF apartment background check

3674 16Th St

Duboce Triangle, SF 94114 3561028 5 units · 3 fl · 1890

This building has significantly more problems than most nearby buildings. A handful of unresolved issues. Worth a careful walk-through and pointed questions.

NOVs (7y) vs. neighborhood
Compared to a typical building in Duboce Triangle
At or below average
avg 2.3
0
FewerMore

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

Rent & eviction protection

Is 3674 16Th 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 1890
2 or more units
5 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
Units5
Floors3
Year built1890
Total area4,500 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot3561028
Ownership

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

Owner name
Zhang Tong Tong
Mailing address
485 35th Ave San Francisco CA 94121
Last sale
031920

Landlord portfolio

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

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Augrented Insights
Initial analysis

Located in the Duboce Triangle neighborhood, 3674 16th Street is a three-story, 5-unit multi-family residential building constructed in 1890 and currently owned by Zhang Tong Tong. The property has undergone several significant improvements over the past decade, including completed soft-story seismic retrofitting in 2017 (tier 3), comprehensive unit renovations in 2017 (including Unit #1 and Unit #4), and roofing work in 2018 costing $9,500. Major infrastructure updates include a plumbing system upgrade with sewer line replacement in 2017, electrical system improvements, and multiple kitchen and bathroom remodels. However, recent concerns have emerged regarding unpermitted work at the property, particularly a potentially unauthorized bathroom addition (reported August 2022) and sewer lateral replacement work (September 2023) that reportedly obstructed public access and violated ADA requirements.

The building has a history of compliance issues dating back to 2001, when multiple violations were recorded related to stairs, smoke detectors, and combustible storage, though these were all abated by 2003. There were also significant concerns in 2018 regarding lead paint removal practices, and complaints about possible unpermitted dwelling unit conversions and short-term rental activity were filed in 2018. The property has experienced some maintenance challenges as evidenced by multiple 311 calls, particularly relating to sewer issues in 2021 and exterior maintenance concerns. While most recent building work has been permitted and completed, the pattern of recent complaints suggests ongoing concerns about compliance with building codes and regulations. The building's historical records show a pattern of permits for various improvements and repairs, indicating regular maintenance and upgrading of the property over time.

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

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Risk rating

How 3674 16Th 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
17th percentile

Out of 287 buildings in this neighborhood, 238 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
47%
No DBI
violation
53%
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.

DBI tenant complaints (past 7 years)

Formal complaints tenants filed with DBI about this building over 7 years.

Number of units

The number of units affects how the model reads complaint and violation totals — more units means more potential sources.

Permit rate, owner's portfolio

Per-building permit rate across the owner's portfolio.

12-Month severity forecast
No violation 39.7%
Moderate concern 44.1%
Severe concern 16.2%
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

3674 16Th St event timeline

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

2025
311 Request Jun 04
Sidewalk defect
lifted sidewalk tree roots
311 RequestMay 13
Blocking driveway cite tow

See all 8 events

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

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Every record we have

Full data for 3674 16Th 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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