18 A Jefferson Ave
San Rafael 94903 · Santa Venetia · Unincorporated Marin · Coordinates: 37.99906, -122.52759
Parcel & Assessor
- Lot size:
- 7,405 sq ft (0.17 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 18A JEFFERSON AVE; 18 JEFFERSON AVE
Zoning & Land Use
RA-B1 — Residential Agriculture (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned RA-B1 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotCan't tell
Zoned RA-B1 (single-family residential): we can't tell whether it counts as a single-family zone for SB 9. Residential agriculture, estate and restricted: large-lot residential; confirm SB 9 with the county.
- SB 9: split into two lotsCan't tell
Zoned RA-B1 (single-family residential): we can't tell whether it counts as a single-family zone for SB 9. Residential agriculture, estate and restricted: large-lot residential; confirm SB 9 with the county.
Mapped Hazard Zones on This Lot
- CAL FIRE Fire Hazard Severity Zone
- Not in a State-mapped fire hazard severity zone
- FEMA National Flood Hazard Layer
- Zone X: minimal flood hazard (all of the lot) · FIRM panel 06041C0457E, effective March 16, 2016
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
Range: $1,053,000 – $1,341,000 · Status: Off market
HUD Small Area FMR (ZIP 94903) · FY 2026
Studio $2,880 · 1BR $3,450 · 2BR $4,180 · 3BR $5,340 · 4BR $5,530
Nearby Activity (½ mile radius, since October 2024)
4 active or recent development projects (3 housing units across completed, permitted, and pipeline stages) and 236 total building permits recorded within ½ mile.
- New construction2 permits
- Adds housing (ADU)3 permits (3 units)
- Demolition3 permits
- Additions & renovations20 permits
- Building systems178 permits
- Repairs9 permits
- Other21 permits
Developments Deserving Closer Investigation & Active Area Builders
- New home at 18 Jefferson Ave (Issued)On this parcel
Active in "Issued" for 8.4 yr (first record Jun 20, 2018) with no new permit activity recorded in 7.4 yr.
- New commercial building at 170 N San Pedro Rd (Issued)0.22 mi E
Active in "Issued" for 4.9 yr (first record Dec 1, 2021) with no new permit activity recorded in 4.3 yr. High-impact scale ($18,000,000 declared valuation across 1 permit).
- New commercial building at 10 Ave Of The Flags (Issued)0.39 mi NW
Active in "Issued" for 5.6 yr (first record Mar 26, 2021) with no new permit activity recorded in 5.5 yr. High-impact scale ($2,000,000 declared valuation across 1 permit).
- Accessory dwelling unit at 13 Jefferson Ave (Issued)230 ft S
Active in "Issued" for 7.1 yr (first record Sep 10, 2019) with no new permit activity recorded in 6.9 yr.
Permit & Project History on This Parcel (3 permits, 1 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 171360 | Solar / battery storage | Issued | Iss. May 6, 2022 | $25,900 | 6.80kw Rooftop Photovotlaic - Express |
| 161698 | New single-family home | Issued | Iss. Jun 5, 2019 | $150,000 | New Adu T.D. 9/12/18 |
| 161697 | New single-family home | Issued | Iss. Jun 5, 2019 | $40,000 | Tear Down Rebuild House T.D. 9/12/18 |
State HCD Housing Element APR records on this parcel: 1 entry (report years 2019).