645 Cedarberry Ln
San Rafael 94903 · Marinwood · Unincorporated Marin · Coordinates: 38.02861, -122.55566
Executive Verdict · Public-Records Synthesis
Zoned R1 in Unincorporated Marin with likely ADU & SB 9 infill eligibility and mapped CAL FIRE high fire hazard severity zone (local responsibility area) due diligence; benchmark value $1,292,000 ($1,137,000–$1,447,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned R1 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 7,667 sq ft lot. Local precedent is active with 2 ADU permits within ¼ mile over the last 36 months.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
- ✓ Documented permitted upgrades (+$11,845 contributory est.)
Public building records show issued construction/renovation work on this parcel (5 total permits, latest Sep 25, 2025).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
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 High 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 598 Loganberry Dr (adu 598a) (0.21 mi N, 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)
- ! Year 1 Prop 13 tax reset (~$15,308/yr at $1,292,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$1,276/mo). Confirm exact Mello-Roos / CFD special assessments on the county tax bill.
Source: CA Const. Art. XIIIA (Prop 13) · County Tax Collector
Parcel & Assessor
- Lot size:
- 7,667 sq ft (0.18 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 645 CEDARBERRY LN
Zoning & Land Use
R1 — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R1, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R1, a single-family residential zone. The lot is 7,667 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) (all of the lot, map Mar 24, 2025)
- FEMA National Flood Hazard Layer
- Zone X: minimal flood hazard (all of the lot) · FIRM panel 06041C0293E, 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: $1,137,000 – $1,447,000 · 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
Developments Deserving Closer Investigation & Active Area Builders
- Accessory dwelling unit at 598 Loganberry Dr (adu 598a) (Issued)0.21 mi N
Active in "Issued" for 2.2 yr (first record Sep 6, 2024) with no new permit activity recorded in 22 mo. High-impact scale (1 housing unit, $830,000 declared valuation across 1 permit).
- New home (Entitled)0.25 mi S
In "Entitled" for 6.6 yr (since Apr 8, 2020), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
- Accessory dwelling unit at 860 Idylberry Rd (Applied)0.31 mi W
In "Applied" for 5.5 yr (since May 28, 2021), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
- Demolition at 860 Appleberry Dr (Issued)0.36 mi SW
Active in "Issued" for 7 yr (first record Nov 18, 2019) with no new permit activity recorded in 7 yr.
Entity-resolved builders & contractors in ½ mile: Sonomarin Solar_inc (1 on parcel, 1 in ½ mi · Solar / battery storage); Bellows Plumbing Heating And Air (1 on parcel, 1 in ½ mi · HVAC / heat pump); John Owens Services (1 on parcel, 1 in ½ mi · Plumbing / water heater / sewer); John Owens Service (1 on parcel, 1 in ½ mi · Plumbing / water heater / sewer); Integrity Electric (1 on parcel, 1 in ½ mi · Electrical / panel).
Permit & Project History on This Parcel (5 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B44052 | Plumbing / water heater / sewer | Issued | Iss. Sep 25, 2025 | $14,000 | REMOVED OLD BOILER AND REPLACE WITH NEW. SAME LOCATION IN GARAGE — Replace Plumbing Fixtures(s) |
| B28879 | Solar / battery storage | Issued | Iss. Feb 25, 2022 | $31,335 | Photovoltaic- Residential flush and tilt roof mount,grid-tied 7.98kw |
| B26834 | HVAC / heat pump | Issued | Iss. Aug 30, 2021 | $15,000 | Install new 48K Mitsubishi Mini Split on left side of the home. — Mechanical Appliance |
| 152437 | Plumbing / water heater / sewer | Issued | Iss. Jun 20, 2016 | $10,763 | New Boiler/Water Heater |
| 152005 | Electrical / panel | Issued |