80 Garden Rock Rd
San Anselmo 94960 · Sleepy Hollow · Unincorporated Marin · Coordinates: 38.01544, -122.59208
Executive Verdict · Public-Records Synthesis
Zoned R1-BD in Unincorporated Marin with likely ADU & SB 9 infill eligibility and mapped CAL FIRE moderate fire hazard severity zone (state responsibility area) due diligence; benchmark value $1,985,000 ($1,747,000–$2,223,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned R1-BD supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 16,553 sq ft lot. Local precedent is active with 3 ADU permits within ¼ mile over the last 36 months.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
- ✓ Documented permitted upgrades (+$47,525 contributory est.)
Public building records show issued construction/renovation work on this parcel (5 total permits, latest Jan 3, 2025).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
- ✓ Above-average reinvestment in Sleepy Hollow
32 substantial renovation & housing permits over 24 months (32.7 per 1,000 parcels vs. 16.4 citywide baseline) (#4 of 22 neighborhoods).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (Sleepy Hollow)
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 Moderate 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)
- ! Delayed or open permit activity on this parcel
Pool / spa (81620): Pending in review for 8.6 yr (23.2× the 136d median) — slower than 90% of pool / spa permits in Unincorporated Marin (median 136d, 90th pct 393d, n=162).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (review-time benchmark)
- ! 5 slow or stalled nearby projects within ½ mile
Closest lead: New home at 99 Garden Rock Rd (310 ft 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)
Parcel & Assessor
- Lot size:
- 16,553 sq ft (0.38 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 80 GARDEN ROCK RD
Zoning & Land Use
R1-BD — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1-BD (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R1-BD, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R1-BD, a single-family residential zone. The lot is 16,553 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
- Moderate 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 06041C0289D, 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: $1,747,000 – $2,223,000 · Status: Off market
HUD Small Area FMR (ZIP 94960) · FY 2026
Studio $2,510 · 1BR $3,010 · 2BR $3,640 · 3BR $4,650 · 4BR $4,820
Developments Deserving Closer Investigation & Active Area Builders
- New home at 99 Garden Rock Rd (Applied)310 ft W
In "Applied" for 3.1 yr (since Oct 11, 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, $1,200,000 declared valuation across 1 permit).
- Pool / spa (81620) (Applied)On this parcel
Pending in review for 8.6 yr (23.2× the 136d median) — slower than 90% of pool / spa permits in Unincorporated Marin (median 136d, 90th pct 393d, n=162).
- New commercial building at 1500 Butterfield Rd (Issued)0.34 mi E
Active in "Issued" for 4 yr (first record Oct 25, 2022) with no new permit activity recorded in 12 mo. High-impact scale ($2,700,000 declared valuation across 2 permits).
- New commercial building at 1500 Butterfield Rd (Applied)0.34 mi E
Active in "Applied" for 7.5 yr (first record May 15, 2019) with no new permit activity recorded in 7.5 yr. High-impact scale ($2,500,000 declared valuation across 2 permits).
Entity-resolved builders & contractors in ½ mile: G Family (1 on parcel, 2 in ½ mi · Remodel / interior alteration); G Family Construction (1 on parcel, 1 in ½ mi · New garage / accessory structure); Tesla Energy (1 on parcel, 1 in ½ mi · Solar / battery storage); G Electric (1 on parcel, 1 in ½ mi · Electrical / panel); Owner Builder (17 in ½ mi · Remodel / interior alteration).
Permit & Project History on This Parcel (5 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 178389 | Remodel / interior alteration | Issued | Iss. Jan 3, 2025 | $65,000 | Remodel Of (2) Bathrms On 1st Flr, Flood Mitigation |
| 166656 | Solar / battery storage | Issued | Iss. Dec 23, 2020 | $38,610 | 11.9kw Rooftop Photovoltaic & Energy Storage System -Express |
| 81620 | Pool / spa | Applied | App. Mar 21, 2018 | $34,500 | New Pool***Expired T.D. 4/20/18 |
| B14453 | Electrical / panel | Issued | Iss. Mar 6, 2018 | $5,000 | Changing the location of the panel and upgrading existing 100 amp panel to 200 amp. — Service Upgrade |
| 156113 | New garage / accessory structure | Issued | Iss. Jul 31, 2017 |