Parcel Context · Public-Records Property BriefAPN 018-163-28

2 Main St

San Quentin 94964 · San Quentin · Unincorporated Marin · Coordinates: 37.94244, -122.48150

Executive Verdict · Public-Records Synthesis

Zoned RSP-5.8 in Unincorporated Marin with likely ADU & SB 9 infill eligibility and zero mapped flood, fire, or fault hazard overlaps; benchmark value $1,438,000 ($1,222,000–$1,654,000).

Upsides & Opportunities

✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned RSP-5.8 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 9,670 sq ft lot.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
✓ 2 documented municipal building permits on file
On-parcel permit history is indexed through Feb 8, 2016, 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)
! 1 slow or stalled nearby project within ½ mile
Closest lead: New home at 22 Mckenzie St (0.12 mi W, issued). 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 (~$16,987/yr at $1,438,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$1,416/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:: 9,670 sq ft (0.22 ac)
Assessor use:: Single-Resid. - Improved
Addresses on lot:: 2 MAIN ST

Zoning & Land Use

RSP-5.8 — Residential Single Family Planned (Unincorporated Marin)

State Housing Pathways Screen (ADU & SB 9)

ADU or junior ADULikely eligible
Zoned RSP-5.8 (single-family residential): state law allows ADUs where homes are allowed.
SB 9: two homes on the lotLikely eligible
Zoned RSP-5.8, a single-family residential zone.
SB 9: split into two lotsLikely eligible
Zoned RSP-5.8, a single-family residential zone. The lot is 9,670 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 06041C0478E, effective March 16, 2016
CGS Alquist-Priolo Earthquake Fault Zone: Not in an Alquist-Priolo Earthquake Fault Zone

Surrounding Rent & Value Benchmarks (Public Records)

Estimated Price (Area ZHVI + ACS + Permit Benchmark):$1,438,000

Range: $1,222,000 – $1,654,000 · Status: Off market

HUD Small Area FMR (ZIP 94964) · FY 2026

Studio $2,530 · 1BR $3,040 · 2BR $3,680 · 3BR $4,700 · 4BR $4,870

ACS 2020–2024 Median Gross Rent (San Quentin):$3,500+

ACS 2020–2024 Median Home Value (San Quentin):$1,385,000±$160,000

Nearby Activity (½ mile radius, since November 2024)

0 active or recent development projects and 12 total building permits recorded within ½ mile.

Additions & renovations2 permits
Building systems8 permits

Developments Deserving Closer Investigation & Active Area Builders

New home at 22 Mckenzie St (Issued)0.12 mi W
Active in "Issued" for 3.9 yr (first record Dec 27, 2022) with no new permit activity recorded in 2.8 yr. High-impact scale (1 housing unit, $850,000 declared valuation across 1 permit).

Entity-resolved builders & contractors in ½ mile: Owner Builder (1 on parcel, 2 in ½ mi · Remodel / interior alteration); Abc Cooling And Heating (1 on parcel, 1 in ½ mi · HVAC / heat pump); James Flanagan Builder (2 in ½ mi · New garage / accessory structure); Rodd Renovations (1 in ½ mi · New single-family home); Bolt Down The Bay Area (1 in ½ mi · Remodel / interior alteration).

Permit & Project History on This Parcel (2 permits, 0 grouped projects)

Record #	Category	Status	Applied / Issued	Valuation	Description
150667	HVAC / heat pump	Issued	Iss. Feb 8, 2016	$6,851	Repl Furnace; Add A/C***Expired
149993	Roof replacement	Issued	Iss. Dec 2, 2015	$13,500	Tear-Off & Re-Roof - Bwop

Executive Verdict · Public-Records Synthesis

Zoned RSP-5.8 in Unincorporated Marin with likely ADU & SB 9 infill eligibility and zero mapped flood, fire, or fault hazard overlaps; benchmark value $1,438,000 ($1,222,000–$1,654,000).

Upsides & Opportunities

✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned RSP-5.8 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 9,670 sq ft lot.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
✓ 2 documented municipal building permits on file
On-parcel permit history is indexed through Feb 8, 2016, 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)
! 1 slow or stalled nearby project within ½ mile
Closest lead: New home at 22 Mckenzie St (0.12 mi W, issued). 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 (~$16,987/yr at $1,438,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$1,416/mo). Confirm exact Mello-Roos / CFD special assessments on the county tax bill.
Source: CA Const. Art. XIIIA (Prop 13) · County Tax Collector

State Housing Pathways Screen (ADU & SB 9)

ADU or junior ADULikely eligible

Zoned RSP-5.8 (single-family residential): state law allows ADUs where homes are allowed.

SB 9: two homes on the lotLikely eligible

Zoned RSP-5.8, a single-family residential zone.

SB 9: split into two lotsLikely eligible

Zoned RSP-5.8, a single-family residential zone. The lot is 9,670 sq ft by the assessor, room for two lots of at least 1,200 sq ft, each at least 40% of the original.