130 Stanford Ave
Mill Valley 94941 · Almonte · Unincorporated Marin · Coordinates: 37.88707, -122.53232
Executive Verdict · Public-Records Synthesis
Zoned R1-B1 in Unincorporated Marin with likely ADU & SB 9 infill eligibility and zero mapped flood, fire, or fault hazard overlaps; benchmark value $2,061,000 ($1,814,000–$2,308,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned R1-B1 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 5,009 sq ft lot. Local precedent is active with 4 ADU permits within ¼ mile over the last 36 months.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
- ✓ Documented permitted upgrades (+$11,520 contributory est.)
Public building records show issued construction/renovation work on this parcel (6 total permits, latest Aug 5, 2026).
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)
- ! 6 slow or stalled nearby projects within ½ mile
Closest lead: New home at 560 Alta Way (0.47 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 (~$24,152/yr at $2,061,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$2,013/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:
- 5,009 sq ft (0.11 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 130 STANFORD AVE
Zoning & Land Use
R1-B1 — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1-B1 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R1-B1, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R1-B1, a single-family residential zone. The lot is 5,009 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
- Not in a State-mapped fire hazard severity zone
- FEMA National Flood Hazard Layer
- Zone X: minimal flood hazard (all of the lot) · FIRM panel 06041C0468F, 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: $1,814,000 – $2,308,000 · Status: Off market
HUD Small Area FMR (ZIP 94941) · FY 2026
Studio $2,730 · 1BR $3,270 · 2BR $3,960 · 3BR $5,060 · 4BR $5,240
Nearby Activity (½ mile radius, since November 2024)
25 active or recent development projects (23 housing units across completed, permitted, and pipeline stages) and 576 total building permits recorded within ½ mile.
- New construction13 permits (3 units)
- Adds housing (ADU)19 permits (19 units)
- Demolition1 permit
- Additions & renovations39 permits
- Building systems403 permits
- Repairs20 permits
- Other81 permits
Developments Deserving Closer Investigation & Active Area Builders
- New home at 560 Alta Way (Applied)0.47 mi W
In "Applied" for 3.3 yr (since Aug 10, 2023), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121). High-impact scale (1 housing unit, $975,000 declared valuation across 1 permit).
- New commercial building at 100 Harvard Ave (Issued)0.1 mi N
Active in "Issued" for 23 mo (first record Dec 26, 2024) with no new permit activity recorded in 18 mo. High-impact scale ($6,500,000 declared valuation across 1 permit).
- Accessory dwelling unit at 131 Yale Ave A (Issued)0.19 mi E
Active in "Issued" for 4.8 yr (first record Jan 19, 2022) with no new permit activity recorded in 3.4 yr. High-impact scale (1 housing unit, $1,000,000 declared valuation across 1 permit).
- New home at 217 Cleveland Ave (Issued)0.26 mi SE
Active in "Issued" for 9.7 yr (first record Feb 21, 2017) with no new permit activity recorded in 2.3 yr. High-impact scale (1 housing unit, $875,000 declared valuation across 1 permit).
Entity-resolved builders & contractors in ½ mile: Owner (1 on parcel, 54 in ½ mi · Remodel / interior alteration); Northern Pacific Power (4 on parcel, 4 in ½ mi · Solar / battery storage); Apollo Building And Roofing Group (1 on parcel, 1 in ½ mi · Roof replacement); Owner Builder (101 in ½ mi · Remodel / interior alteration); Miette (6 in ½ mi · Remodel / interior alteration).
Permit & Project History on This Parcel (6 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B47765 | Other | Issued | Iss. Aug 5, 2026 | $2,400 | — |
| B47235 | Roof replacement | Issued | Iss. Jun 19, 2026 | $35,000 | ReRoofing |
| 162303 | Electrical / panel | Issued | Iss. Aug 12, 2019 | $200 | Panel Swap Like For Like |
| 162302 | Solar / battery storage | Issued | Iss. Aug 12, 2019 | $5,000 | Battery Back Up Express |
| 162301 | Solar / battery storage | Issued | Iss. Aug 12, 2019 | $16,600 | Pv 2.88 Kw Express |
| B14345 | Windows / doors / siding | Issued | Iss. Feb 15, 2018 | $20,000 | Replace 20 windows in kind — Non-structural Door/Window Replacement |