Parcel Context · Public-Records Property BriefAPN 050-191-16
310 Tennessee Ave
Mill Valley 94941 · Tamalpais · Unincorporated Marin · Coordinates: 37.87979, -122.53048
Parcel & Assessor
- Lot size:
- 8,538 sq ft (0.20 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 310 TENNESSEE AVE
Zoning & Land Use
R1-B1 — Residential Single Family (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R1-B1 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R1-B1, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R1-B1, a single-family residential zone. The lot is 8,538 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 06041C0469F, effective March 16, 2016
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
HUD Small Area FMR (ZIP 94941) · FY 2026
Studio $2,730 · 1BR $3,270 · 2BR $3,960 · 3BR $5,060 · 4BR $5,240
ACS 2020–2024 Median Gross Rent (Tamalpais):$2,994±$755 Source: ACS 2020–2024 5-year estimates. Geography: Tamalpais.
ACS 2020–2024 Median Gross Rent (ZIP 94941):$3,100±$331 Source: ACS 2020–2024 5-year estimates. Geography: Mill Valley.
Zillow Home Value Index (ZIP 94941, September 2026):$2,181,389
ACS 2020–2024 Median Home Value (Tamalpais):$1,805,000±$71,000 Source: ACS 2020–2024 5-year estimates. Geography: Tamalpais.
ACS 2020–2024 Median Home Value (ZIP 94941):$2,000,000+ Source: ACS 2020–2024 5-year estimates. Geography: Mill Valley.
Nearby Activity (½ mile radius, since October 2024)
22 active or recent development projects (21 housing units across completed, permitted, and pipeline stages) and 594 total building permits recorded within ½ mile.
- New construction18 permits (3 units)
- Adds housing (ADU)17 permits (17 units)
- Demolition1 permit
- Additions & renovations40 permits
- Building systems420 permits
- Repairs30 permits
- Other68 permits
Permit & Project History on This Parcel (4 permits, 1 grouped projects)
Accessory dwelling unit at 310 Tennessee AveStage: Applied · 1 units · $250,000 declared valuation · Last record Oct 13, 2026
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| 94571 | Accessory dwelling unit (new or conversion) | Applied | App. Oct 13, 2026 | $250,000 | Addition To (E) S F D. Conversion Of Attached Accessory Structure To J A D U. Interior Remodel Of (E) S F D. |
| B42795 | HVAC / heat pump | Issued | Iss. Jun 17, 2025 | $17,709 | Install new ductless mini-split with (2) head units — Mechanical Appliance |
| B35999 | Electrical / panel | Issued | Iss. Nov 2, 2023 | $2,000 | Replace damaged 100 amp meter/main panel and mast/weatherhead in kind with new equipment in the same location. Work to b… |
| B14218 | Roof replacement | Issued | Iss. Jan 31, 2018 | $10,650 | REMOVE BUILT-UP ROOFING ON LOW SLOPED SECTIONS INSTALL NEW BUILT-UP ON SLOPED SECTIONS, REMOVE BUILT-UP INSTALL CLASS A … |