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Building and Landlord Data Analysis Report

2420 20th Ave, San Francisco, CA 94116

3
Complaints
0
Fire Incidents
262
311 Calls
0
Permits

Risk Assessment

30
High Risk

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

Our AI predicts there is a 30% chance of no major maintenance issues.
Augrented Insights Report

The property at 2420 20th Avenue in San Francisco's Parkside neighborhood, owned by Wang Sun Inc, is a single-story, multi-family residential building constructed in 1954. The building has a concerning history of unpermitted construction activity, with multiple complaints filed between 2017 and 2020 regarding unauthorized work on a backyard shed conversion to living quarters.

These complaints, which generated significant neighborhood concern, prompted a special inspection in 2020 for "illegal work." The building has experienced recurring safety and maintenance issues in recent years, particularly between late 2024 and early 2025, including fire code violations for extinguishers and exit maintenance (February 2024), multiple garbage and debris complaints, and infrastructure problems such as a sewage backup discharge (December 2024). The property has also experienced several fire department responses, with documented incidents of smoke detector activation and one contained cooking fire.

Recent activity from January 2025 suggests ongoing maintenance challenges, with multiple open cases including construction equipment blocking sidewalks and reported graffiti. Historically, the building underwent reroofing work in 1994, but the most pressing current issues appear to be related to fire safety systems and sanitation concerns.

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.

2420 20th Ave Report Contents

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Building Overview

Renter Risk Rating

This building is in the riskiest 10% of buildings in Parkside.

Building Characteristics

Total units 0
Year built 1954
Total area 2095 sq ft
Floors 1
Tax Abatements None
Building Class F - Flats & Duplex
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Key Building Statistics

3
Building Complaints
Number of complaints filed with the Department of Building Inspection in the last 7 years.
0
Code Violations
Building code violations issued by DBI in the last 7 years.
0
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.
262
311 Calls
Number of 311 calls for this building.
0
Fire Injuries
Number of fire injuries reported by SFFD.
0
Building Permits
Number of building permits issued by DBI.

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2420 20th Ave Landlord Information

Ownership Data

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

NameAddress
Wang Sun Inc1330 Howard St San Francisco CA 94103

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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2420 20th Ave 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 2420 20th Ave

311 Housing Complaints

The table below shows the 311 housing complaints received regarding the conditions at 2420 20th Ave, as well as requests for service nearby.

OpenedCategoryResponsible AgencyRequest TypeRequest DetailsStatus
2025-07-30 14:49:02+00:00 General Request Healthy Streets Operation Center - Individualhomelessness_and_supportive_housinghousing_homeless request_for_service Closed
2025-07-01 13:58:15+00:00 Residential Building 311 - Supervisorelectrical_hazardous_conditionNone Closed
2025-06-20 15:06:40+00:00 Street and Sidewalk Cleaning PW - Street and Environmental Servicesgarbage_and_debrisglass Closed
2025-06-09 17:06:55+00:00 Tree Maintenance PW - Street and Environmental Servicesovergrown_treeother Closed
2025-05-29 09:20:09+00:00 Graffiti Public ATT - Graffitioffensiveatt_property Closed
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DBI Complaints

Complaints received by the Department of Building Inspection.

Date FiledDate AbatedAssigned DivisionComplaint DescriptionStatusLink
2020-04-16 00:00:00+00:00NoneBuilding Inspection DivisionNo permit more sawing hammering on enlargement of backyard shed to living quarters all of us with permits are shut down! third complaint (311 sr#12326218) Not Active View on DBI
2020-04-08 00:00:00+00:00NoneBuilding Inspection DivisionSawing hammering in rear of property no permit Not Active View on DBI
2017-09-13 00:00:00+00:00NoneBuilding Inspection Division2420 20th avenue, sf/ca 94116 this is not right, no permit showing nor any information about building to all of our neighbors. --- 2420 20th avenue no permit for building being built in back yard. (311 sr nos. 800449,7610189, 8006311, 8006319, 8009554,and 8007893) 7th complaint received on 9/25/2017 from 311 sr no. 8015329 - no permit). 8th complaint - - large outside room built and now addition no permit showing (311 sr no. 8115518). Not Active View on DBI
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DBI Violations

Building code violations records.

Date FiledDate AbatedItemViolation DescriptionStatus
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Fire Violations

Fire code violations recorded by the San Francisco Fire Department.

Violation DateDisposition DateAddressViolation DescriptionStatus
2024-02-02T00:00:00.000Z2418 20th Aveillumination / repair emergency lighting abated
2024-02-02T00:00:00.000Z2418 20th Aveextinguisher / service required abated
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Fire Incidents

Historical fire incident records for the property.

Incident DatePrimary SituationIgnition CauseCivilian Injuries
2024-09-29 00:00:00+00:00554 Assist invalidNone0
2023-09-01 00:00:00+00:00622 No incident found on arrival at dispatch addressNone0
2023-08-03 00:00:00+00:00700 False alarm or false call, otherNone0
2021-03-11 00:00:00+00:00745 Alarm system activation, no fire - unintentionalNone0
2020-10-06 00:00:00+00:00735 Alarm system sounded due to malfunctionNone0
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Building Permits

Permit records for 2420 20th Ave.

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
24060312441 20th AvenueNoneNoneNone
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How 2420 20th Ave Compares

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