70 Madrone Ave
Woodacre 94973 · Woodacre · Unincorporated Marin · Coordinates: 38.00328, -122.64245
Executive Verdict · Public-Records Synthesis
Zoned R1-B3-SGV in Unincorporated Marin with likely ADU & SB 9 infill eligibility and mapped CAL FIRE high fire hazard severity zone (state responsibility area) due diligence; benchmark value $1,240,000 ($1,091,000–$1,389,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned R1-B3-SGV supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 31,102 sq ft lot.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
- ✓ Documented permitted upgrades (+$37,048 contributory est.)
Public building records show issued construction/renovation work on this parcel (4 total permits, latest Jan 30, 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 (State 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 Apr 1, 2024)
- ! 4 slow or stalled nearby projects within ½ mile
Closest lead: New home at 15 Edgewood Dr (0.18 mi E, 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 (~$14,710/yr at $1,240,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$1,226/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:
- 31,102 sq ft (0.71 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 70 MADRONE AVE
Zoning & Land Use
R1-B3-SGV — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1-B3-SGV (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R1-B3-SGV, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R1-B3-SGV, a single-family residential zone. The lot is 31,102 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 (State Responsibility Area) (all of the lot, map Apr 1, 2024)
- FEMA National Flood Hazard Layer
- Zone X: minimal flood hazard (all of the lot) · FIRM panel 06041C0275D, 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: $1,091,000 – $1,389,000 · Status: Off market
HUD Small Area FMR (ZIP 94973) · FY 2026
Studio $2,080 · 1BR $2,510 · 2BR $3,020 · 3BR $3,860 · 4BR $4,000
Developments Deserving Closer Investigation & Active Area Builders
- New home at 15 Edgewood Dr (Applied)0.18 mi E
In "Applied" for 6.1 yr (since Oct 22, 2020), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
- New home at 10 Holly Ln (Applied)0.22 mi N
Active in "Applied" for 14 mo (first record Sep 17, 2025) with no new permit activity recorded in 14 mo.
- Demolition at 90 Carson Rd (Issued)0.38 mi N
Active in "Issued" for 4.8 yr (first record Jan 21, 2022) with no new permit activity recorded in 4.7 yr.
- Accessory dwelling unit at 49 Conifer Way A K A (Issued)0.49 mi N
Active in "Issued" for 7.3 yr (first record Jul 11, 2019) with no new permit activity recorded in 7.2 yr.
Entity-resolved builders & contractors in ½ mile: Swell Services (2 on parcel, 2 in ½ mi · Solar / battery storage); Bellows Plumbing Heating And Air (1 on parcel, 1 in ½ mi · HVAC / heat pump); All Bay Solar Construction (1 on parcel, 1 in ½ mi · Solar / battery storage); Owner Builder (10 in ½ mi · New garage / accessory structure); Owner (7 in ½ mi · Demolition).
Permit & Project History on This Parcel (4 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B41062 | Solar / battery storage | Issued | Iss. Jan 30, 2025 | $1,000 | We are relocating the service head for our existing 200A panel upgrade that was on the solar permit for this address. 20… |
| B36353 | HVAC / heat pump | Issued | Iss. Dec 7, 2023 | $12,000 | Replacing gas furnace with new electric 42K Mitsubishi heat pump located in the front yard. — Mechanical Appliance |
| B34493 | Solar / battery storage | Issued | Iss. Jul 5, 2023 | $37,080 | Installation of solar panels on an existing residential roof. |
| B34188 | Solar / battery storage | Issued | Iss. Jun 7, 2023 | $37,081 | Installation of solar panels on an existing residential roof size 10.8kW — EV Charging Station |