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48-50 Santa Rosa Ave

Mission Terrace, SF 94112 6796019

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 Mission Terrace
At or below average
avg 2.3
0
FewerMore

This building has 0 novs (7y), at or below the Mission Terrace average of 2.3.

Rent & eviction protection

Is 48-50 Santa Rosa Ave 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 1900
2 or more units
? units
Property type
Multi-Family Residential
Zoning
RH1
Possibly exempt. Built before 1979 but single-unit — single-family homes and condos may be exempt from the SF Rent Ordinance.

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

Building characteristics
Units—
Floors2
Year built1900
Total area1,880 sq ft
Property typeMulti-Family Residential
Tax statusHome Owners
Blocklot6796019
Ownership

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

Owner name
Ayerdis Martha S & Jose L
Mailing address
50 Santa Rosa Ave San Francisco CA 94112
Last sale
083004

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.

50 Santa Rosa Ave, San Francisco, CA 94112
48 Santa Rosa Ave, San Francisco, CA 94112
Augrented Insights
Initial analysis

The two-story multi-family residential building at 48-50 Santa Rosa Ave in Mission Terrace, owned by Martha S Ayerdis and Jose L Ayerdis, has a complex history dating back to its 1900 construction. The most notable historical event occurred between May 2000 and March 2002, when unauthorized construction of a horizontal addition to the rear of the building led to building violations that were eventually resolved through proper permitting. This unauthorized construction was documented as a first-floor family room with a second-floor bedroom and bathroom, with the permit being issued in September 2000 for $32,000. More recently, between 2023 and 2025, there have been several maintenance and safety concerns, including a tree root issue causing sidewalk damage (reported December 2024 and currently open), a blocked exit resolved in March 2011, and multiple parking violations involving blocked driveways and illegal parking, particularly during 2024. The property has also experienced recurring issues with street cleanliness, as evidenced by multiple 311 calls regarding garbage and debris on the street and sidewalks throughout 2024, with some cases being resolved with no work needed. The most recent building maintenance work on record was a trim board replacement project completed in 2016, costing $600, which involved work not visible from the street.

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

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Risk rating

How 48-50 Santa Rosa Ave'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
56th percentile

Out of 149 buildings in this neighborhood, 66 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
69%
No DBI
violation
31%
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.

Neighborhood (ZIP code)

The ZIP code captures local housing market and enforcement patterns that affect all buildings in the area.

Building age

Older buildings tend to have more maintenance challenges; SF's pre-1906 earthquake housing stock carries distinct risk.

12-Month severity forecast
No violation 77.4%
Moderate concern 13.4%
Severe concern 9.1%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months at each severity level. Model: full_hgb_balanced.
Apartment reviews

48-50 Santa Rosa Ave apartment reviews

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The story over time

48-50 Santa Rosa Ave event timeline

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

2026
311 Request Apr 19
Garbage and debris
other loose garbage debris yard waste

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 48-50 Santa Rosa Ave apartments

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

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