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4509-4511 Mission St

Excelsior, SF 94112 6014044 3 units · 2 fl · 1924

This building has far more open problems than almost any other in the neighborhood. A handful of unresolved issues. Worth a careful walk-through and pointed questions.

NOVs (7y) vs. neighborhood
Compared to a typical building in Excelsior
At or below average
avg 1.4
0
FewerMore

This building has 0 novs (7y), at or below the Excelsior average of 1.4.

Rent & eviction protection

Is 4509-4511 Mission 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 1924
2 or more units
3 units
Property type
Multi-Family Residential
Zoning
NC3
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
Units3
Floors2
Year built1924
Total area3,400 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot6014044
Ownership

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

Owner name
Mo Richard Bo Bu
Mailing address
2607 37th Ave San Francisco CA 94116
Last sale
120511

Landlord portfolio

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

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Multiple entrances & addresses

Included addresses

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

4509 Mission St, San Francisco, CA 94112
4511 Mission St, San Francisco, CA 94112
Augrented Insights
Initial analysis

The two-story mixed-use building at 4509-4511 Mission Street, owned by Richard Bo Bu Mo, was constructed in 1924 and contains three residential units above a ground floor commercial space. The property has experienced several maintenance and upgrade projects over the years, including a 2021 water supply line installation, a 2012 awning installation, and multiple plumbing improvements in 2007. Notably, there are some concerning recent issues, including an active building complaint from April 2022 regarding an unpermitted canopy installation for a type I hood system, and a fire violation from December 2016 for blocked exits that was subsequently abated. The building's maintenance history shows attention to basic upkeep, with work done to the flooring, plumbing, and electrical systems in various renovation projects.

The surrounding area has experienced typical urban challenges as documented through 311 calls, with the most recent issues in 2024 including reports of double parking, garbage and debris, and occasional graffiti. Historical records show some tenant service disruptions, including a hot water outage in 2001 that was promptly resolved within one day, and a sewage backup incident in 2021 that was also addressed. The property has undergone various improvements over the years, including reroofing in 1993, floor finishing in 1991, and significant plumbing upgrades, though some permits from the 1990s and 2007 are now expired. The owners have generally maintained the building's infrastructure, with most recent permits showing proper channels were used for legitimate improvements.

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

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Risk rating

How 4509-4511 Mission 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
8th percentile

Out of 337 buildings in this neighborhood, 310 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
42%
No DBI
violation
58%
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.

Property class: apartment building

Apartment building — this property classification influences expected violation rates.

Neighborhood location

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

12-Month severity forecast
No violation 29.5%
Moderate concern 58.4%
Severe concern 12.1%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months at each severity level. Model: full_hgb_balanced.
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The story over time

4509-4511 Mission St event timeline

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

2025
311 Request Sep 04
Sewage back-up discharge
from side sewer vent

See all 4 events

Full history back to 2021 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 4509-4511 Mission St apartments

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

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