Free SF apartment background check

3847-3849 18Th St

Eureka Valley/Dolores Heights, SF 94114 3585077 2 units · 4 fl · 1907

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 Eureka Valley/Dolores Heights
At or below average
avg 1.3
0
FewerMore

This building has 0 novs (7y), at or below the Eureka Valley/Dolores Heights average of 1.3.

Rent & eviction protection

Is 3847-3849 18Th 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 1907
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
Floors4
Year built1907
Total area4,372 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot3585077
Ownership

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

Owner name
Folmann Troels & Knox Tawni
Mailing address
3847 18th St San Francisco CA 94114
Last sale
051221

Landlord portfolio

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

Unlock complete report
Multiple entrances & addresses

Included addresses

All street addresses sharing this blocklot that are covered by this report.

3849 18th St, San Francisco, CA 94114
3847 18th St, San Francisco, CA 94114
Augrented Insights
Initial analysis

The four-story, multi-family residential building at 3847-3849 18th Street, owned by Troels Folmann and Tawni Knox, has undergone significant and contentious changes since 2013, when it was identified as having three dwelling units instead of the legally permitted two. Built in 1907, this Eureka Valley/Dolores Heights property has been the subject of multiple building violations and complaints, with the most critical issues revolving around unauthorized unit conversions, safety hazards, and construction work performed beyond permitted scope. Notable violations from 2013 included serious life safety concerns such as inadequate heating, missing smoke detectors, insufficient natural light and ventilation, and low ceiling heights, along with unpermitted wiring and plumbing work that established the building as a public nuisance. Between 2015-2018, numerous permits were obtained for substantial renovation work, including bathroom and kitchen remodels, installation of a fire sprinkler system, and various electrical upgrades. However, several complaints were filed regarding work beyond permit scope, including a 2019 complaint about unauthorized rear additions and excavation work. The building received significant improvements during 2016-2018, including electrical upgrades, plumbing renovations, and safety system installations, but has been subject to ongoing scrutiny regarding its occupancy status and whether proper permits and inspections were obtained for all modifications.

Most recently, in 2023, there have been concerns about maintenance issues, including reports of garbage, debris, and sewer problems in the surrounding area. While many building permits show "Complete" status, there remain active planning records indicating potential unresolved issues related to unauthorized construction and unit conversions. The property's recent history shows a pattern of compliance attempts following violations, with some permits being issued or revised to address specific safety concerns, including a comprehensive sprinkler monitoring system installed in 2017 at a cost of $300,000 and various other safety improvements totaling over $350,000. However, the building's complex history of building violations, occupancy disputes, and ongoing complaint investigations suggests that the property has experienced significant regulatory challenges during its recent renovation period, with particular attention required for issues related to unauthorized unit conversions and occupancy status.

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

Free account unlocks the full analysis — plus 2× more records across all data categories and the complete landlord portfolio.
Risk rating

How 3847-3849 18Th 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
13th percentile

Out of 1278 buildings in this neighborhood, 1112 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 floors

Building height affects maintenance complexity and is one of the size signals the model uses.

Permit rate, owner's portfolio

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

12-Month severity forecast
No violation 35.6%
Moderate concern 43.2%
Severe concern 21.2%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months at each severity level. Model: full_hgb_balanced.
Apartment reviews

3847-3849 18Th St apartment reviews

Real experiences from people who have lived here. Share yours to help other renters decide.

Share your experience — Help other renters by leaving an honest apartment review

Create account

Loading reviews…

On the map

Compare nearby alternatives

This building and nearby alternatives, color-coded by risk level. Click any marker to explore.

Buildings nearby
Loading…
The story over time

3847-3849 18Th St event timeline

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

2020
DBI Complaint May 19
Date last observed: 18-may-20; exact location: main bldg; building type: residence/dwelling work beyond scope of permit; ; additional information: i am requesting that all building and planning code violations be abated through the timely completion of all permitted work and that work be inspected and signed off by a dbi inspector. ;
Building Inspection Division

See all 1 events

Full history back to 2020 — violations, complaints, permits, buyouts, and fire incidents.

Unlock complete timeline
Every record we have

Full data for 3847-3849 18Th St apartments

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

Still apartment hunting in SF?

Look up the next apartment before you sign

Search any SF address free — no account needed to see the risk rating.

Search another address Get full report
Simple pricing

Get the complete picture

Every plan unlocks the complete report: all 13 SF datasets, full history, landlord portfolio, and PDF & Excel exports.

Report Bundle

For the buildings you're deciding on right now

$10 one-time

~$3.33 per building. No subscription ever. Each credit unlocks one building's premium report for 30 days.

  • 3 full AI-powered reports
  • Download PDF reports
  • Advanced safety analysis
  • Compare multiple buildings
  • Credits never expire until you use them
  • Full public records (200 rows per dataset)
Buy 3 Reports — $10

Apartment Hunter

For a wide search across many buildings

$39 one-time

30 reports — ~$1.30 each. No subscription ever.

  • 30 full AI-powered reports
  • Download PDF reports
  • Advanced safety analysis
  • Compare multiple buildings
  • Credits never expire until you use them
  • Full public records (200 rows per dataset)
Buy 30 Reports — $39
Most Popular Current plan

Renter

For the weeks when the stakes are highest

$10/mo

Billed $120/year — save $24 vs monthly

  • Unlimited basic reports
  • 5 premium AI reports per month
  • Download PDF & Excel reports
  • Full public records (200 rows per dataset)
  • Full event timeline — every year of history
  • Landlord portfolio & ownership insights
Start Your Search

Less than $0.34/day. Cancel anytime.

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

Watch 3847-3849 18Th St
Get alerted the moment a new violation or complaint is filed.