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Building and Landlord Data Analysis Report

3809 20th St, San Francisco, CA 94114

5
Complaints
2
Fire Incidents
150
311 Calls
8
Permits

Risk Assessment

19
High Risk

This building is in the riskiest 10% of buildings in Presidio Heights with significant maintenance issues.

Our AI predicts there is a 19% chance of no major maintenance issues.
Augrented Insights Report

The 25-unit apartment building at 3809 20th Street, owned by SF 3809 20th Street LLC, has undergone significant renovations and faced several maintenance challenges since its construction in 1922. Most recently, in 2025, Unit 304 received substantial improvements to its kitchen and bathroom, including washer and dryer installation, though this renovation triggered serious concerns about improper removal of asbestos and lead-based materials, according to complaints filed in December 2024. The building has shown consistent investment in unit improvements over the past several years, with multiple units receiving kitchen and bathroom upgrades along with laundry facility installations between 2018 and 2025, typically with permits totaling between $28,000 and $63,169.

The property has experienced various maintenance and safety issues, particularly in its fire safety systems. In 2023-2024, there were violations related to fire alarm maintenance and sleeping area requirements, with ongoing work to upgrade the fire alarm system to meet current codes. Past issues include multiple fire safety violations in 2016 regarding fire proofing, emergency lighting, and other fire-related concerns, all of which were abated.

The building's history also includes some concerning incidents, such as a serious water and sewage leak in the garage in 2021, persistent mold issues in 2018, and a significant tenant buyout of $30,000 in October 2020. The property has maintained its basic safety requirements, being classified as Tier 2 soft-story compliant with work completed and a Certificate of Final Completion issued. Recent 311 calls have primarily concerned external factors like debris, graffiti, and lighting issues around the building's perimeter, rather than internal maintenance problems.

Last updated: January 17, 2025
This report is created with AI and based on the most recent 10 data items in each category. Full reports with 50+ data points are available to subscribers.

3809 20th St Report Contents

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Building Overview

Renter Risk Rating

This building is in the riskiest 10% of buildings in Eureka Valley/Dolores Heights.

Building Characteristics

Total units 25
Year built 1922
Total area 17552 sq ft
Floors 3
Tax Abatements None
Building Class A15 - Apartment 15 Units or more
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Key Building Statistics

5
Building Complaints
Number of complaints filed with the Department of Building Inspection in the last 7 years.
5
Code Violations
Building code violations issued by DBI in the last 7 years.
2
Fire Incidents
Total number of fire incidents reported at this building.
0
DBI Director Hearings
Number of Director's Hearings held by DBI in the last 7 years.
150
311 Calls
Number of 311 calls for this building.
0
Fire Injuries
Number of fire injuries reported by SFFD.
8
Building Permits
Number of building permits issued by DBI.

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3809 20th St Landlord Information

Ownership Data

Ownership data from the Secured Roll (property tax) provided by the SF Assessor-Recorder.

NameAddress
Sf 3809 20th Street LlcSteven C. Thrower 1 Bush St Ste 900 San Francisco CA 94104

Landlord Portfolio

We cross-reference landlords' property tax registrations to find the other buildings they own or manage.

AddressUnitsCode ViolationsRisk Rating
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Landlord Court Records

From CA Court Service & DocketAlarm. Note: name matching only, verify parties are actually the owners by reviewing the case files!

Date FiledCase TitleCourtLink
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3809 20th St Rent Control Status

Year Built
Built before 1979
Units
More than 1 unit
Rent Board Registration
Not applicable
Additional Info
N/A
Year BuiltUnitsRent Board RegistrationAdditional Info
Before 1979 >1 unit N/A N/A

Full Building Data for 3809 20th St

311 Housing Complaints

The table below shows the 311 housing complaints received regarding the conditions at 3809 20th St, as well as requests for service nearby.

OpenedCategoryResponsible AgencyRequest TypeRequest DetailsStatus
2025-07-27 22:16:25+00:00 Illegal Postings PW - Street and Environmental Servicesaffixed_improperlyNone Open
2025-07-27 11:05:47+00:00 RPD General 311 - Supervisorpark_services_areatrash_dumping Closed
2025-07-19 09:23:41+00:00 Streetlights PUC - Streetlightslightlight_on_all_the_time Closed
2025-07-14 15:11:47+00:00 Illegal Postings PW - Street and Environmental Servicesaffixed_improperlyNone Closed
2025-07-14 15:10:47+00:00 Illegal Postings PW - Street and Environmental Servicesposted_on_traffic_lightNone Closed
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DBI Complaints

Complaints received by the Department of Building Inspection.

Date FiledDate AbatedAssigned DivisionComplaint DescriptionStatusLink
2024-12-16 00:00:00+00:002025-01-08 00:00:00+00:00Building Inspection DivisionDate last observed: 13-dec-24; time last observed: 5:00pm; identity of person performing the work: brick + timber; floor: 3rd floor; unit: 304; exact location: main bldg; building type: residence/dwelling work w/o permit; work beyond scope of permit; work being done in dangerous manner; ; additional information: 100+ year old unit, being renovated for first time in at least 40-50 years. asbestos containing materials and lead based paint being removed without any precautions or signage for workers or for fellow residents.; Not Active View on DBI
2024-12-16 00:00:00+00:00NoneBuilding Inspection DivisionDate last observed: 13-dec-24; time last observed: 5:00pm; identity of person performing the work: brick + timber; floor: 3rd floor; unit: 304; exact location: main bldg; building type: residence/dwelling work w/o permit; work beyond scope of permit; work being done in dangerous manner; ; additional information: 100+ year old unit, being renovated for first time in at least 40-50 years. asbestos containing materials and lead based paint being removed without any precautions or signage for workers or for fellow residents.; Not Active View on DBI
2023-04-20 00:00:00+00:002023-05-23 00:00:00+00:00Housing Inspection ServicesGeneral maintenance; compliance affidavits due. Not Active View on DBI
2021-11-23 00:00:00+00:00NoneHousing Inspection ServicesCaller reports environmental issue in apartment building parking garage. garage is on the 1st floor. there is a serious leak of lots of water, raw sewage which is backing up in the garage. Not Active View on DBI
2019-04-02 00:00:00+00:00NoneBuilding Inspection DivisionStrong toxic old fumes in apartment seeping thru the walls. walls are not completely sealed. causes headache and lack of sleep. health safety for her pets. very strong in the apartment compared to the hallway. toxic order is stronger in kitchen, bathroom, and pantry. Not Active View on DBI
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DBI Violations

Building code violations records.

Date FiledDate AbatedItemViolation DescriptionStatus
2023-04-20T00:00:00.000Z inspector comments it is the property owners responsibility to be present or direct his/her representative to attend the re-inspection as scheduled on this notice of violation for the purpose of providing entry to the inspector of those areas not accessed during the initial inspection as specified, and/or to provide access to all areas cited within this notice. if the property owner cannot attend the scheduled re-inspection (as specified on this notice) it is his/her responsibility to secure a different inspection date and time with the inspector, and provide all tenants with notification as required by california civil code section 1954 (san francisco housing code section 303(b), if any dwellings, apartment units or guest rooms are to be accessed during the re-inspection. important note: due to the violations noted, this property is defined as a nuisance per sec. 1001-d of the sfhc. please review the attached "notice of violation warnings" for information regarding failure to comply with this notice. other sectionnot active
2023-04-20T00:00:00.000Z inspectors comment violations cited are located in the common areas only. at the time of reinspection provide access to the heat boilers thermostat. building sectionnot active
2023-04-20T00:00:00.000Z repair fire proofing with approved materials (hc 1001(m), 809) repair the damaged basement ceiling surfaces as well as any other missing or damaged fire resistive surfaces. repairs are typically made with 5/8" type x drywall. edges, fastener heads, and all ceiling/wall penetrations must be fire taped or sealed with fire foam or caulking. fire sectionnot active
2023-04-20T00:00:00.000Z repair, maintain fire escape drop ladder in working condition (sec 908 hc) at the time of re-inspection the property owner or agent must demonstrate the workability of the fire escape ladder(s) or provide written documentation from a qualified service company or contractor stating that all parts are in good working order. building sectionnot active
2023-04-20T00:00:00.000Z prep & paint wall (1001b,1301 hc) prep the peeling painted wall surfaces in the boiler room. paint as needed. interior surfaces sectionnot active
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Fire Violations

Fire code violations recorded by the San Francisco Fire Department.

Violation DateDisposition DateAddressViolation DescriptionStatus
2023-11-18T00:00:00.000Z3809 20th Stsleeping area requirements open
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Fire Incidents

Historical fire incident records for the property.

Incident DatePrimary SituationIgnition CauseCivilian Injuries
2024-12-22 00:00:00+00:00730 System malfunction, otherNone0
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Building Permits

Permit records for 3809 20th St.

Permit Creation DateEstimated CostDescriptionStatusPermit Number
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Electrical Permits

Electrical system permits for the building.

Application DateDescriptionStatusPermit Number
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Plumbing Permits

Plumbing system permits for the building.

Application DateDescriptionStatusPermit Number
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Planning Records

Planning records for the property.

DateProject AddressDescriptionApplicant
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Tenant Buyouts

Tenant buyout records for the property.

BlocklotAddressAgreement DateAmountTenants
36060013809 20th Street2020-10-13 00:00:00+00:0030000.01
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How 3809 20th St Compares

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