324 A Riviera Dr
San Rafael 94901 · San Rafael · Coordinates: 37.99075, -122.46397
Executive Verdict · Public-Records Synthesis
Zoned R1a-H in San Rafael with likely ministerial ADU eligibility and mapped FEMA AE flood due diligence; benchmark value $1,553,000 ($1,320,000–$1,786,000).
Upsides & Opportunities
- ✓ Ministerial ADU / JADU pathway likely eligible
Zone R1a-H allows residential use qualifying for ministerial ADU review under state law.
Source: San Rafael zoning · CA Gov. Code 66314
Watchouts & Due Diligence
- ! FEMA Special Flood Hazard Area (AE, about 1% 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)
- ! 4 slow or stalled nearby projects within ½ mile
Closest lead: New home (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)
- ! Bulk building permits not published for San Rafael
Permit counts and nearby activity on this page may omit municipal counter records. Request a parcel permit report directly from the local building department.
Source: Source coverage registry (San Rafael)
- ! Year 1 Prop 13 tax reset (~$18,310/yr at $1,553,000)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$1,526/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:
- 60,723 sq ft (1.39 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 324A RIVIERA DR; 324 RIVIERA DR
Zoning & Land Use
R1a-H (San Rafael)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1a-H (single-family residential): state law allows ADUs where homes are allowed. We read R1a-H from the zoning code's name; we haven't checked it against San Rafael's code text.
- SB 9: two homes on the lotPossible, with conditions
Zoned R1a-H, a single-family residential zone. We read R1a-H from the zoning code's name; we haven't checked it against San Rafael's code text. FEMA Special Flood Hazard Area (Zone AE) covers about 1% 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 R1a-H, a single-family residential zone. We read R1a-H from the zoning code's name; we haven't checked it against San Rafael's code text. The lot is 60,723 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 about 1% 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) (about 1% of the lot); Zone X: minimal flood hazard (about 99% of the lot) · FIRM panel 06041C0477E, 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: $1,320,000 – $1,786,000 · Status: Off market
HUD Small Area FMR (ZIP 94901) · FY 2026
Studio $2,150 · 1BR $2,580 · 2BR $3,120 · 3BR $3,990 · 4BR $4,130
Nearby Activity (½ mile radius, since —)
2 active or recent development projects (2 housing units across completed, permitted, and pipeline stages) and 0 total building permits recorded within ½ mile.
Developments Deserving Closer Investigation & Active Area Builders
- New home (Issued)300 ft N
Active in "Issued" for 2.7 yr (first record Mar 19, 2024) with no new permit activity recorded in 2.7 yr.
- New home (Issued)0.12 mi W
Active in "Issued" for 13 mo (first record Oct 2, 2025) with no new permit activity recorded in 13 mo.
- New home (Entitled)0.13 mi E
Active in "Entitled" for 8.4 yr (first record Jun 15, 2018) with no new permit activity recorded in 8.4 yr.
- New home (Entitled)0.46 mi NE
Active in "Entitled" for 6.3 yr (first record Aug 10, 2020) with no new permit activity recorded in 6.3 yr.
Permit & Project History on This Parcel (0 permits, 1 grouped projects)
No building permits recorded on this parcel in our dataset.
State HCD Housing Element APR records on this parcel: 2 entries (report years 2022, 2025).