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1840 Church St

Glen Park, SF 94131 6655011 2 units · 2 fl · 1979

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 Glen Park
At or below average
avg 1.4
1
FewerMore

This building has 1 novs (7y), at or below the Glen Park average of 1.4.

Rent & eviction protection

Is 1840 Church 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 1979
2 or more units
2 units
Property type
Multi-Family Residential
Zoning
RH2
Not rent-controlled. Buildings constructed after 1978 are generally exempt from SF rent increase limits under the Costa-Hawkins Act.

Based on SF Assessor records. Not legal advice — confirm with the SF Rent Board.

Building characteristics
Units2
Floors2
Year built1979
Total area2,640 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot6655011
Ownership

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

Owner name
Calderon Carlos E
Mailing address
429 B St Colma CA 94014
Last sale
111507

Landlord portfolio

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

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Augrented Insights
Initial analysis

The two-unit residential property at 1840 Church Street in Glen Park, owned by Carlos E Calderon, has been facing significant maintenance and compliance challenges in recent years. Built in 1979, this two-story flats/duplex building has experienced persistent water-related issues, with multiple complaints between 2017-2018 reporting water intrusion, mold, and dilapidated conditions affecting multiple units. Notably, there is an active violation from April 2024 regarding an alleged illegal third unit behind the garage, with associated concerns about unapproved construction work, wiring, plumbing, and fire safety deficiencies. Most concerning are the recent complaints from February 2024 about unpermitted roof work, deck rebuilding, and structural problems. Historical records from 1999 indicate prior issues with unauthorized uses of the garage space, including concerns about a mechanic shop and illegal car repair business operations.

Recent activity at the property shows ongoing maintenance and compliance issues, with multiple complaints and violations remaining unresolved as of 2024. In addition to the building and habitability concerns, there have been several complaints regarding illegal parking in the vicinity throughout early 2025, though these could not be consistently validated by responding officers. The property has also generated service requests related to exposed wires, garbage issues, and utility billing matters, though many of these were resolved through normal channels. Given the pattern of persistent maintenance issues, particularly regarding water damage and unauthorized modifications, these records suggest ongoing challenges with building upkeep and regulatory compliance.

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

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Risk rating

How 1840 Church 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
11th percentile

Out of 364 buildings in this neighborhood, 324 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
46%
No DBI
violation
54%
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.

Neighborhood location

Precise location is a proxy for neighborhood-level risk — some SF blocks have systematically higher DBI activity.

DBI complaint rate, owner's portfolio

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

12-Month severity forecast
No violation 36.9%
Moderate concern 44.0%
Severe concern 19.2%
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

1840 Church St event timeline

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

2026
Planning Record Feb 23
Hello, my partner and I are interested in purchasing this property and wanted to understand the work required to legalize one of the unwarranted units and what is required of the second warranted unit. There are currently two units that are unwarranted: top floor studio which is currently tenant occupied and bottom floor 1br/ba. Current open complaint for this property are here: https://dbiweb02.sfgov.org/dbipts/default.aspx?page=AddressComplaint&ComplaintNo=202421762
Submitted

See all 6 events

Full history back to 2024 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 1840 Church St apartments

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

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