15 Aztec Ave
Forest Knolls 94933 · Forest Knolls · Unincorporated Marin · Coordinates: 38.01370, -122.68907
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 $941,000 ($828,000–$1,054,000).
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 12,937 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 Jul 7, 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 (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)
- ! 6 slow or stalled nearby projects within ½ mile
Closest lead: Demolition at 2 Juarez Ave (300 ft N, 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 (~$11,272/yr at $941,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$939/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:
- 12,937 sq ft (0.30 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 15 AZTEC 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 12,937 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: $828,000 – $1,054,000 · Status: Off market
HUD Small Area FMR (ZIP 94933) · FY 2026
Studio $2,870 · 1BR $3,440 · 2BR $4,160 · 3BR $5,310 · 4BR $5,510
Developments Deserving Closer Investigation & Active Area Builders
- Demolition at 2 Juarez Ave (Issued)300 ft N
Active in "Issued" for 9.9 yr (first record Dec 28, 2016) with no new permit activity recorded in 8.9 yr.
- New home at 42 Juarez Ave (Issued)380 ft NE
Active in "Issued" for 10.2 yr (first record Aug 31, 2016) with no new permit activity recorded in 9.7 yr.
- Demolition at 51 Aztec Ave (aka Lower Aztec) (Issued)0.12 mi SE
Active in "Issued" for 11.9 yr (first record Dec 10, 2014) with no new permit activity recorded in 11.9 yr.
- Accessory dwelling unit at 103 Juarez Ave (Issued)0.14 mi NE
Active in "Issued" for 5.2 yr (first record Aug 24, 2021) with no new permit activity recorded in 4.1 yr.
Entity-resolved builders & contractors in ½ mile: Peter Levi Plumbing (1 on parcel, 1 in ½ mi · HVAC / heat pump); Able Roofing (1 on parcel, 1 in ½ mi · Roof replacement); Modern Summit Roofing Contractors (1 on parcel, 1 in ½ mi · Roof replacement); Ernest Ongaro And Sons (1 on parcel, 1 in ½ mi · Electrical / panel); Owner Builder (12 in ½ mi · Accessory dwelling unit (new or conversion)).
Permit & Project History on This Parcel (4 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B47365 | Roof replacement | Issued | Iss. Jul 7, 2026 | $6,000 | ReRoofing |
| B32360 | Roof replacement | Issued | Iss. Jan 23, 2023 | $17,995 | REMOVE AND REPLACE CLASS A COMP SHINGLE ROOF. — ReRoofing; With Electronic Inspection |
| B31198 | HVAC / heat pump | Issued | Iss. Sep 27, 2022 | $23,250 | Install 4 ton 5 zone minisplit HP system with 5 indoor units; (1) 12k BTU unit, (4) 9k BTU units; — Replace Mechanical A… |
| B30639 | Electrical / panel | Issued | Iss. Aug 5, 2022 | $3,050 | We will remove and replace the existing 100 amp Zinsco service meter main combo panel/ junction box and adjoining sub pa… |