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23-25 Valparaiso St

Russian Hill, SF 94133 0091010A 2 units · 2 fl · 1910

This building has a higher-than-average number of open problems nearby. Few open issues; problems get fixed quickly. A reasonable bet for a smooth tenancy.

NOVs (7y) vs. neighborhood
Compared to a typical building in Russian Hill
At or below average
avg 1.9
0
FewerMore

This building has 0 novs (7y), at or below the Russian Hill average of 1.9.

Rent & eviction protection

Is 23-25 Valparaiso 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 1910
2 or more units
2 units
Property type
Multi-Family Residential
Zoning
RM1
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
Units2
Floors2
Year built1910
Total area2,064 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot0091010A
Ownership

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

Owner name
Nguyen Nelson
Mailing address
Po Box 27302 San Francisco CA 94127
Last sale
000000

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.

23 Valparaiso St, San Francisco, CA 94133
25 Valparaiso St, San Francisco, CA 94133
Augrented Insights
Initial analysis

The two-unit residential building at 23-25 Valparaiso Street in Russian Hill, owned by Nguyen Nelson, is a two-story flats and duplex structure built in 1910. The building's documented maintenance history shows some significant infrastructure work completed between 2004 and 2011, including a substantial electrical system upgrade in 2004 that involved installing new circuits, upgrading to a 150-amp service with two meters, and a reroofing project in 2006 costing $6,000. More recently, the property experienced a sewer-related issue in August 2022 involving a 4-inch sewer vent, which was promptly addressed and resolved by the Public Utilities Commission.

The building's external environment has seen several typical urban incidents over the past few years, including multiple parking-related complaints: in 2022, there were reports of a driveway blocking incident, an abandoned vehicle case involving a Corvette in 2021 (which was resolved when officers arrived), and another parking violation involving a Kia Soul in 2019 that resulted in a police response. A notable administrative event occurred in February 2022 when the Rent Board updated the unit count to reflect the proper two-unit configuration, with the owner being informed that a refund process could take several months to complete. The building's permit history shows some street space permits issued in 2011, though the cost was minimal at $1.00, suggesting these were likely routine or administrative in nature.

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

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Risk rating

How 23-25 Valparaiso 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
87th percentile

Out of 1133 buildings in this neighborhood, 147 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
90%
No DBI
violation
10%
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.

Neighborhood location

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

Construction spend, owner's portfolio

Estimated permit value across all of this owner's buildings.

Building permits, owner's portfolio

Permits pulled across all of this owner's buildings over 7 years.

12-Month severity forecast
No violation 81.6%
Moderate concern 9.4%
Severe concern 8.9%
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

23-25 Valparaiso St event timeline

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

2026
Building Permit May 04
Construct partition wall at garage level. remodel e kitchen, e bath 2nd fl and 1st fl. construct new 1/2 bath, new hvac at 2nd fl and 1st fl. replace all windows in kind except are windoww at both kitchens. new electrical throughout.
$200,000 · Filed

See all 1 events

Full history back to 2026 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 23-25 Valparaiso St apartments

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

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Cancel anytime · Data sourced from SF Open Data, DBI, SFFD, SF Rent Board & Planning

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