300 Mt Shasta Dr
San Rafael 94903 · Lucas Valley · Unincorporated Marin · Coordinates: 38.03308, -122.57597
Executive Verdict · Public-Records Synthesis
Zoned R1-B-LV 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 $1,391,000 ($1,224,000–$1,558,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned R1-B-LV supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 8,886 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
- ✓ 4 documented municipal building permits on file
On-parcel permit history is indexed through Aug 5, 2026, letting you verify roof, HVAC, electrical, or structural work against seller disclosures.
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 42 Oak Mountain Ct (0.33 mi W, applied). 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 (~$16,447/yr at $1,391,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$1,371/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:
- 8,886 sq ft (0.20 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 300 MT SHASTA DR
Zoning & Land Use
R1-B-LV — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1-B-LV (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R1-B-LV, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R1-B-LV, a single-family residential zone. The lot is 8,886 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 06041C0287D, 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: $1,224,000 – $1,558,000 · 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 42 Oak Mountain Ct (Applied)0.33 mi W
In "Applied" for 5.5 yr (since Apr 30, 2021), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
- Demolition at 2000 Lucas Valley Rd (Applied)0.43 mi W
In "Applied" for 4.4 yr (since Jun 7, 2022), exceeding the 55d median and 261d 90th percentile for demolition permits in Unincorporated Marin (n=130).
- New home at 85 Pikes Peak Dr (Issued)0.14 mi SE
Active in "Issued" for 3.1 yr (first record Oct 20, 2023) with no new permit activity recorded in 2.4 yr.
- New home at 2 Mt Wittenburg Ct (adu 2a) (Issued)0.25 mi SW
Active in "Issued" for 2.5 yr (first record May 29, 2024) with no new permit activity recorded in 21 mo.
Entity-resolved builders & contractors in ½ mile: Owner Builder (1 on parcel, 23 in ½ mi · Remodel / interior alteration); Abril Roofing (1 on parcel, 1 in ½ mi · Roof replacement); Smollen The Builder (1 on parcel, 1 in ½ mi · Other); California Energy Services (1 on parcel, 1 in ½ mi · HVAC / heat pump); Owner (9 in ½ mi · Remodel / interior alteration).
Permit & Project History on This Parcel (4 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B47756 | Other | Issued | Iss. Aug 5, 2026 | $17,500 | — |
| B22554 | Roof replacement | Issued | Iss. May 11, 2020 | $27,500 | Foam overlay over an existing tar & gravel roof — ReRoofing; With Electronic Inspection |
| 151671 | HVAC / heat pump | Issued | Iss. Apr 20, 2016 | $8,998 | Install 2 Mini Split Sytems, One With 4 Head Units & One With 2 Head Units - Condensers On Both |
| 145238 | Remodel / interior alteration | Issued | Iss. Dec 16, 2014 | $8,956 | Kitchen & 2 Baths Remodel - In Kind; Sheet Rock One Wall In Garage - No Insulation - Bwop |