144 Caribe Isle
Novato 94949 · Bel Marin Keys · Unincorporated Marin · Coordinates: 38.08328, -122.52094
Executive Verdict · Public-Records Synthesis
Zoned RSP-5.8-BFC in Unincorporated Marin with likely ministerial ADU eligibility and mapped FEMA AE flood due diligence; benchmark value $1,537,000 ($1,353,000–$1,721,000).
Upsides & Opportunities
- ✓ Ministerial ADU / JADU pathway likely eligible
Zone RSP-5.8-BFC allows residential use qualifying for ministerial ADU review under state law.
Source: Unincorporated Marin zoning · CA Gov. Code 66314
- ✓ Documented permitted upgrades (+$182,412 contributory est.)
Public building records show issued construction/renovation work on this parcel (4 total permits, latest Jul 10, 2025).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
Watchouts & Due Diligence
- ! FEMA Special Flood Hazard Area (AE, all of the lot of lot)
Zone AE: 1% annual chance flood (Special Flood Hazard Area) overlaps this parcel. Expect mandatory flood insurance for federally backed loans and floodplain elevation/mitigation rules for new units or SB 9 applications.
Source: FEMA National Flood Hazard Layer (parcel polygon)
- ! Delayed or open permit activity on this parcel
Addition (adds square footage) (171084): Issued after 3.4 yr (7.8× the 160d median) — slower than 90% of addition (adds square footage) permits in Unincorporated Marin (median 160d, 90th pct 440d, n=316).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (review-time benchmark)
- ! 3 slow or stalled nearby projects within ½ mile
Closest lead: Demolition at 54 Calypso Shores (0.46 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 (~$18,126/yr at $1,537,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$1,510/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:
- 10,193 sq ft (0.23 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 144 CARIBE ISLE
Zoning & Land Use
RSP-5.8-BFC — Residential Single Family Planned (Unincorporated Marin)
Undesignated — Undesignated (Novato)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned RSP-5.8-BFC (single-family residential): state law allows ADUs where homes are allowed. The parcel point also falls in Undesignated.
- SB 9: two homes on the lotPossible, with conditions
Zoned RSP-5.8-BFC, a single-family residential zone. The parcel point also falls in Undesignated. FEMA Special Flood Hazard Area (Zone AE) covers all of the lot: the project must meet the National Flood Insurance Program floodplain standards, or the lot needs a map revision.
- SB 9: split into two lotsPossible, with conditions
Zoned RSP-5.8-BFC, a single-family residential zone. The parcel point also falls in Undesignated. The lot is 10,193 sq ft by the assessor, room for two lots of at least 1,200 sq ft, each at least 40% of the original. FEMA Special Flood Hazard Area (Zone AE) covers all of the lot: the project must meet the National Flood Insurance Program floodplain standards, or the lot needs a map revision.
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 AE: 1% annual chance flood (Special Flood Hazard Area) (all of the lot) · FIRM panel 06041C0284E, 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: $1,353,000 – $1,721,000 · Status: Off market
HUD Small Area FMR (ZIP 94949) · FY 2026
Studio $2,360 · 1BR $2,830 · 2BR $3,430 · 3BR $4,380 · 4BR $4,540
Developments Deserving Closer Investigation & Active Area Builders
- Addition (adds square footage) (171084) (Issued)On this parcel
Issued after 3.4 yr (7.8× the 160d median) — slower than 90% of addition (adds square footage) permits in Unincorporated Marin (median 160d, 90th pct 440d, n=316).
- Demolition at 54 Calypso Shores (Applied)0.46 mi E
In "Applied" for 4.5 yr (since May 26, 2022), exceeding the 55d median and 261d 90th percentile for demolition permits in Unincorporated Marin (n=130).
- Demolition at 1051 Bel Marin Keys Blvd (Issued)0.27 mi E
Active in "Issued" for 8.5 yr (first record May 21, 2018) with no new permit activity recorded in 8.4 yr.
- Demolition at 18 Dolphin Isle (Issued)0.47 mi SE
Active in "Issued" for 11.6 yr (first record Mar 25, 2015) with no new permit activity recorded in 11.6 yr.
Entity-resolved builders & contractors in ½ mile: Juan Calmell (1 on parcel, 2 in ½ mi · Addition (adds square footage)); Aaa Consttruction And Design (1 on parcel, 1 in ½ mi · Addition (adds square footage)); Solarcraft Services (1 on parcel, 1 in ½ mi · Solar / battery storage); A And J Solar Electric (1 on parcel, 1 in ½ mi · Solar / battery storage); Owner Builder (24 in ½ mi · Remodel / interior alteration).
Permit & Project History on This Parcel (4 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B43062 | Solar / battery storage | Issued | Iss. Jul 10, 2025 | $21,000 | 14.19KW roof mounted PV system containing (33) QCell 430W modules |
| B33936 | Solar / battery storage | Issued | Iss. May 18, 2023 | $51,343 | (N) FLUSH MOUNTED 14.80 kW PV SYSTEM W/ GRID TIED MICROINVERTERS |
| 171084 | Addition (adds square footage) | Issued | Iss. Apr 5, 2022 | $250,000 | Remodel & Addtn |
| 143534 | Remodel / interior alteration | Issued | Iss. Jul 30, 2014 | $10,000 | Remodel 2 Baths, Replace Sewer Line - Extend To 7/30/16 |