210 Johnstone Dr
San Rafael 94903 · Marinwood · Unincorporated Marin · Coordinates: 38.04127, -122.53910
Executive Verdict · Public-Records Synthesis
Zoned R1-B2 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 $1,396,000 ($1,228,000–$1,564,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned R1-B2 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 21,432 sq ft lot. Local precedent is active with 1 ADU permit within ¼ mile over the last 36 months.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
- ✓ Documented permitted upgrades (+$13,440 contributory est.)
Public building records show issued construction/renovation work on this parcel (3 total permits, latest Apr 20, 2023).
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: 125 new homes (0.24 mi SW, entitled). 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 (~$16,504/yr at $1,396,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$1,375/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:
- 21,432 sq ft (0.49 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 210 JOHNSTONE DR
Zoning & Land Use
R1-B2 — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1-B2 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R1-B2, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R1-B2, a single-family residential zone. The lot is 21,432 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 06041C0291D, effective May 4, 2009
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
Range: $1,228,000 – $1,564,000 · 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
- 125 new homes (Entitled)0.24 mi SW
In "Entitled" for 23 mo (since Dec 6, 2024), exceeding the 292d median and 313d 90th percentile for new multifamily / condos / mixed-use permits in Unincorporated Marin (n=21). High-impact scale (125 housing units, 124 deed-restricted affordable across 0 permits).
- Accessory dwelling unit at 2558 Heatherstone Dr (Applied)0.4 mi SW
In "Applied" for 5.5 yr (since Apr 29, 2021), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
- Demolition at 249 Johnstone Dr (Issued)400 ft SE
Active in "Issued" for 8.7 yr (first record Mar 15, 2018) with no new permit activity recorded in 8.6 yr.
- New home at 251 Johnstone Ct (Issued)480 ft SE
Active in "Issued" for 8.4 yr (first record Jun 12, 2018) with no new permit activity recorded in 7.7 yr.
Entity-resolved builders & contractors in ½ mile: United Solar Electric (1 on parcel, 1 in ½ mi · Solar / battery storage); United Solar (1 on parcel, 1 in ½ mi · Solar / battery storage); Kl And C Electric (1 on parcel, 1 in ½ mi · Electrical / panel); Owner Builder (31 in ½ mi · Remodel / interior alteration); Owner (19 in ½ mi · Remodel / interior alteration).
Permit & Project History on This Parcel (3 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B33530 | Solar / battery storage | Issued | Iss. Apr 20, 2023 | $9,800 | ADD/INSTALL 6 NEW PV MODULES TO AN EXISTING PG&E GRID TIED PHOTOVOLTAIC SYSTEM, ROOF MOUNTED |
| 168004 | Solar / battery storage | Issued | Iss. May 3, 2021 | $12,000 | 3.6 Kw Rooftop Photovoltaic System |
| B13190 | Electrical / panel | Issued | Iss. Aug 30, 2017 | $1,500 | UPGRADE ELECTRICAL SERVICE TOO 200AMP — Service Upgrade |