56 Toussin Ave
Kentfield 94904 · Kentfield · Ross · Coordinates: 37.96098, -122.55113
Executive Verdict · Public-Records Synthesis
Zoned R1-B3 in Ross with likely ADU & SB 9 infill eligibility and mapped CAL FIRE moderate fire hazard severity zone (local responsibility area) due diligence; benchmark value $2,495,000 ($2,196,000–$2,794,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned R1-B3 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 40,903 sq ft lot. Local precedent is active with 1 ADU permit within ¼ mile over the last 36 months.
Source: Ross zoning · CA Gov. Code 66314 & 65852.21
- ✓ Documented permitted upgrades (+$26,429 contributory est.)
Public building records show issued construction/renovation work on this parcel (7 total permits, latest Jun 4, 2025).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
- ✓ Above-average reinvestment in Kentfield
104 substantial renovation & housing permits over 24 months (41.3 per 1,000 parcels vs. 16.4 citywide baseline) (#7 of 22 neighborhoods).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (Kentfield)
Watchouts & Due Diligence
- ! Mapped flood awareness zone (Zone X: minimal flood hazard)
all of the lot of the parcel intersects Zone X: minimal flood hazard. Outside mandatory federal SFHA insurance rules, but check local drainage and finished-floor requirements.
Source: FEMA National Flood Hazard Layer (parcel polygon)
- ! CAL FIRE Moderate Fire Hazard Severity Zone (Local Responsibility Area) (all of the lot of lot)
Located in a mapped Fire Hazard Severity Zone. Expect Chapter 7A ignition-resistant building standards, defensible-space inspections, and stricter property insurance underwriting.
Source: CAL FIRE FHSZ (map Mar 24, 2025)
- ! 6 slow or stalled nearby projects within ½ mile
Closest lead: Accessory dwelling unit at 66 Hanken Dr (adu 66a) (0.23 mi SE, issued). Inspect timeline history before assuming near-term completion.
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · HCD APR (½-mile radius)
- ! Bulk building permits not published for Ross
Permit counts and nearby activity on this page may omit municipal counter records. Request a parcel permit report directly from the local building department.
Source: Source coverage registry (Ross)
Parcel & Assessor
- Lot size:
- 40,903 sq ft (0.94 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 56 TOUSSIN AVE
Zoning & Land Use
R1-B3 — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1-B3 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R1-B3, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R1-B3, a single-family residential zone. The lot is 40,903 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
- Moderate Fire Hazard Severity Zone (Local Responsibility Area) (all of the lot, map Mar 24, 2025)
- FEMA National Flood Hazard Layer
- Zone X: minimal flood hazard (all of the lot) · FIRM panel 06041C0458F, 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: $2,196,000 – $2,794,000 · Status: Off market
HUD Small Area FMR (ZIP 94904) · FY 2026
Studio $2,260 · 1BR $2,710 · 2BR $3,280 · 3BR $4,190 · 4BR $4,340
Developments Deserving Closer Investigation & Active Area Builders
- Accessory dwelling unit at 66 Hanken Dr (adu 66a) (Issued)0.23 mi SE
Active in "Issued" for 3.1 yr (first record Sep 29, 2023) with no new permit activity recorded in 2.8 yr. High-impact scale (1 housing unit, $1,000,000 declared valuation across 1 permit).
- New home at 7 Cedar Ave (Issued)0.32 mi S
Active in "Issued" for 7.7 yr (first record Mar 14, 2019) with no new permit activity recorded in 5.5 yr. High-impact scale (1 housing unit, $1,217,500 declared valuation across 2 permits).
- Accessory dwelling unit at 55 Redwood Dr A D U 55 A (Issued)0.3 mi SW
Active in "Issued" for 17 mo (first record Jun 12, 2025) with no new permit activity recorded in 10 mo. High-impact scale (1 housing unit, $895,000 declared valuation across 1 permit).
- 1 Ridgeview (Entitled)0.12 mi W
Active in "Entitled" for 3.6 yr (first record Mar 23, 2023) with no new permit activity recorded in 3.6 yr.
Permit & Project History on This Parcel (7 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B42630 | Solar / battery storage | Issued | Iss. Jun 4, 2025 | $29,679 | Photovoltaic- Remove existing tilt mounted PV Arrays and replace ballasted roof mount. New arrays connect to existing in… |
| B42336 | Roof replacement | Issued | Iss. May 8, 2025 | $77,000 | Tear off and re-roof residence flat roof only, install "Class A" Fire Rated TPO Membrane (White Color). install 32 squar… |
| B41713 | Electrical / panel | Issued | Iss. Mar 21, 2025 | $2,000 | Relocation of gas meter — New Gas Service |
| B41351 | Windows / doors / siding | Issued | Iss. Feb 25, 2025 | $105,000 | Replace Existing Windows — Non-structural Door/Window Replacement |
| B29730 | HVAC / heat pump |