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Building and Landlord Data Analysis Report

1671-1673 20th Ave, San Francisco, CA 94122

0
Complaints
0
Fire Incidents
7
311 Calls
0
Permits

Risk Assessment

72
Low Risk

This building shows minimal signs of maintenance issues based on our analysis.

Our AI predicts there is a 72% chance of no major maintenance issues.
Augrented Insights Report

The property at 1671-1673 20th Avenue in San Francisco's Central Sunset neighborhood is a two-unit, two-story multi-family residential building constructed in 1924. The most significant recent modification occurred in 2002-2003, when a substantial vertical addition was completed, including the construction of a third floor and penthouse, along with electrical upgrades comprising rewiring work including 5 switches, 10 lights, and 5 receptacles.

The building has undergone several important improvements over the years, including garage modifications and the addition of a basement kitchen in the late 1980s, bathroom installations in the garage during the mid-1980s, and termite repairs in 1997. Of particular note is a housing inspection complaint filed in February 2010 regarding a possible illegal unit on the ground floor with shared entrance, kitchen, and bathroom facilities, though this complaint was marked as "Not Active" by September 2010.

The property has experienced various infrastructure challenges based on 311 calls, particularly concerning pavement defects near the property, with reports filed in 2019, 2020, and most recently in April 2024. Other community-related incidents in the vicinity include occasional noise complaints, waste reports, and parking concerns, all of which were handled through appropriate city channels.

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.

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Building Overview

Renter Risk Rating

This building is in the riskiest 10% of buildings in Central Sunset.

Building Characteristics

Total units 2
Year built 1924
Total area 3702 sq ft
Floors 2
Tax Abatements Home Owners
Building Class F - Flats & Duplex
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Key Building Statistics

0
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.
7
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.

Included Addresses

  • 1673 20th Ave, San Francisco CA 94122
  • 1671 20th Ave, San Francisco CA 94122

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1671-1673 20th Ave Landlord Information

Ownership Data

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

NameAddress
Dong Ren Liou Living TrLiou Dong Ren Trustee 1671 20Th Ave San Francisco CA 94122

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
First 5 items shown. Sign up for 10 free reports a month.

1671-1673 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 1671-1673 20th Ave

311 Housing Complaints

The table below shows the 311 housing complaints received regarding the conditions at 1671-1673 20th Ave, as well as requests for service nearby.

OpenedCategoryResponsible AgencyRequest TypeRequest DetailsStatus
2025-07-15 17:48:30+00:00 Street and Sidewalk Cleaning Recology - Abandonedgarbage_and_debrisfurniture Closed
2025-04-18 06:52:34+00:00 Parking Enforcement MTA - Abandoned Vehicles Workabandoned_vehicleNone Closed
2024-04-26 17:50:00+00:00 General Request - PUBLIC WORKS DPW BSM Queuerequest_for_servicebsm - request_for_service Closed
2020-12-10 11:07:00+00:00 General Request - DPH DPH - Environmental Health - Grequest_for_serviceenvironmental_health - request_for_service Closed
2020-11-18 00:55:30+00:00 Noise Report Noise Report Queueamplified_sound_electronicsNoise Report - amplified_sound_electronics Closed
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DBI Complaints

Complaints received by the Department of Building Inspection.

Date FiledDate AbatedAssigned DivisionComplaint DescriptionStatusLink
2010-02-12 00:00:00+00:002010-09-03 00:00:00+00:00Housing Inspection ServicesPossible illegal unit on ground floor, no separate entrance, w/kitchen & bathroom. Not Active View on DBI
First 5 items shown. Sign up for 10 free reports a month.

DBI Violations

Building code violations records.

Date FiledDate AbatedItemViolation DescriptionStatus
First 5 items shown. Sign up for 10 free reports a month.

Fire Violations

Fire code violations recorded by the San Francisco Fire Department.

Violation DateDisposition DateAddressViolation DescriptionStatus
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Fire Incidents

Historical fire incident records for the property.

Incident DatePrimary SituationIgnition CauseCivilian Injuries
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Building Permits

Permit records for 1671-1673 20th Ave.

Permit Creation DateEstimated CostDescriptionStatusPermit Number
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Electrical Permits

Electrical system permits for the building.

Application DateDescriptionStatusPermit Number
First 5 items shown. Sign up for 10 free reports a month.

Plumbing Permits

Plumbing system permits for the building.

Application DateDescriptionStatusPermit Number
First 5 items shown. Sign up for 10 free reports a month.

Planning Records

Planning records for the property.

DateProject AddressDescriptionApplicant
First 5 items shown. Sign up for 10 free reports a month.

Tenant Buyouts

Tenant buyout records for the property.

BlocklotAddressAgreement DateAmountTenants
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How 1671-1673 20th Ave Compares

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Compare with buildings in Central Sunset:
Showing buildings that are: within 0.5 miles , of similar age (±15 years), of similar size (±50% units)

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