2105 Mar East St
Tiburon 94920 · Tiburon · Coordinates: 37.87526, -122.44872
Executive Verdict · Public-Records Synthesis
Zoned R-2 in Tiburon with likely ministerial ADU eligibility and zero mapped flood, fire, or fault hazard overlaps; benchmark value $3,365,000 ($2,860,000–$3,870,000).
Upsides & Opportunities
- ✓ Ministerial ADU / JADU pathway likely eligible
Zone R-2 allows residential use qualifying for ministerial ADU review under state law.
Source: Tiburon zoning · CA Gov. Code 66314
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)
- ! Delayed or open permit activity on this parcel
New home: Active in "Entitled" for 20 mo (first record Mar 4, 2025) with no new permit activity recorded in 20 mo.
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 (240 ft E, 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 Tiburon
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 (Tiburon)
Parcel & Assessor
- Lot size:
- 5,184 sq ft (0.12 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 2105 MAR EAST ST
Zoning & Land Use
R-2 — Two-Family Residential (Tiburon)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R-2 (two-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotCan't tell
Zoned R-2 (two-family residential): we can't tell whether it counts as a single-family zone for SB 9. Two-Family Residential.
- SB 9: split into two lotsCan't tell
Zoned R-2 (two-family residential): we can't tell whether it counts as a single-family zone for SB 9. Two-Family Residential.
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 06041C0489E, 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: $2,860,000 – $3,870,000 · Status: Off market
HUD Small Area FMR (ZIP 94920) · FY 2026
Studio $2,820 · 1BR $3,380 · 2BR $4,100 · 3BR $5,230 · 4BR $5,420
Nearby Activity (½ mile radius, since November 2024)
10 active or recent development projects (10 housing units across completed, permitted, and pipeline stages) and 28 total building permits recorded within ½ mile.
Developments Deserving Closer Investigation & Active Area Builders
- New home (Entitled)On this parcel
Active in "Entitled" for 20 mo (first record Mar 4, 2025) with no new permit activity recorded in 20 mo.
- New home (Issued)240 ft E
Active in "Issued" for 3.4 yr (first record Jul 6, 2023) with no new permit activity recorded in 3.4 yr.
- New home (Issued)290 ft SW
Active in "Issued" for 3.3 yr (first record Aug 9, 2023) with no new permit activity recorded in 3.3 yr.
- New home (Issued)320 ft SW
Active in "Issued" for 20 mo (first record Mar 20, 2025) with no new permit activity recorded in 20 mo.
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: 1 entry (report years 2025).