41 Chestnut Ave

Parcel & Assessor

Lot size:

10,019 sq ft (0.23 ac)

Assessor use:

Single-Resid. - Improved

Addresses on lot:

41 CHESTNUT AVE

State Housing Pathways Screen (ADU & SB 9)

• ADU or junior ADULikely eligible

  Zoned R7.5 (single-family residential): state law allows ADUs where homes are allowed. We read R7.5 from the zoning code's name; we haven't checked it against San Rafael's code text.

• SB 9: two homes on the lotLikely eligible

  Zoned R7.5, a single-family residential zone. We read R7.5 from the zoning code's name; we haven't checked it against San Rafael's code text.

• SB 9: split into two lotsLikely eligible

  Zoned R7.5, a single-family residential zone. We read R7.5 from the zoning code's name; we haven't checked it against San Rafael's code text. The lot is 10,019 sq ft by the assessor, room for two lots of at least 1,200 sq ft, each at least 40% of the original.

Mapped Hazard Zones on This Lot

CAL FIRE Fire Hazard Severity Zone

High Fire Hazard Severity Zone (Local Responsibility Area) (about 16% of the lot, map Mar 24, 2025); Moderate Fire Hazard Severity Zone (Local Responsibility Area) (about 84% of the lot, map Mar 24, 2025)

FEMA National Flood Hazard Layer

Zone X: minimal flood hazard (all of the lot) · FIRM panel 06041C0456F, effective March 16, 2016

CGS Alquist-Priolo Earthquake Fault Zone

Not in an Alquist-Priolo Earthquake Fault Zone

Surrounding Rent & Value Benchmarks (Public Records)

Nearby Activity (½ mile radius, since October 2024)

9 active or recent development projects (8 housing units across completed, permitted, and pipeline stages) and 15 total building permits recorded within ½ mile.

• New construction1 permit