Tomales 94971 · APN 102-120-01 · Unincorporated Marin
Zoned C-ARP-20 in Unincorporated Marin and mapped CAL FIRE moderate fire hazard severity zone (state responsibility area) due diligence; benchmark value $1,108,000 ($942,000–$1,274,000).
Public building records show issued construction/renovation work on this parcel (4 total permits, latest Nov 8, 2022).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
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)
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)
Automated synthesis of indexed municipal, county, state, and federal public records — informational context only, not a formal appraisal, survey, or legal/tax determination.
Since November 2024 within ½ mile: 1 permitted.
1 projects with a record in this window, grouped by us from permits and State housing reports. Units are as proposed on each project's latest record and counted at its current stage.
11 permits within ½ mile since November 2024
The map shows new construction, ADUs, demolitions, additions, and renovations. Routine systems work (roofs, HVAC, water heaters) is counted but not mapped. Unit counts are as stated on permits.
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: permits located by parcel, ½ mile radius · Retrieved Nov 13, 2026
$1,108,000
Benchmark range: $942,000 – $1,274,000
New commercial building at 100 Bay Rd: Active in "Issued" for 4.4 yr (first record Jun 10, 2022) with no new permit activity recorded in 4.3 yr.
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (review-time benchmark)
Closest lead: New home at 3765 Tomales-petaluma Rd (0.45 mi 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)
Public-records benchmark estimate combining Zillow Home Value Index (Data provided by Zillow), Census ACS 5-year estimates, parcel land-use/lot characteristics, and issued building permits. Not an official appraisal.
No ADU or new-home permits recorded within ¼ mile in this window.
Permit counts, by the date issued (or applied, if not yet issued). Lot splits are planning cases, which we don't have.
We read public zoning and hazard maps against state law (ADUs: Gov. Code 66314; SB 9: Gov. Code 65852.21 and 66411.7). Local rules, title, tenancy history and site conditions can change the answer. Check with Unincorporated Marin's planning department before relying on it.
Sources: County of Marin GIS (MarinMap), Zoning (11 cities and unincorporated Marin) (retrieved Nov 13, 2026) · CAL FIRE Office of the State Fire Marshal, Fire Hazard Severity Zones in the State Responsibility Area (effective 2024-04-01) (retrieved Nov 9, 2026) · CAL FIRE Office of the State Fire Marshal, Fire Hazard Severity Zones in the Local Responsibility Area (map dated 2025-03-24) (retrieved Nov 9, 2026) · FEMA, National Flood Hazard Layer — flood hazard zones (retrieved Nov 9, 2026) · FEMA, National Flood Hazard Layer — FIRM panels (retrieved Nov 9, 2026) · California Geological Survey, Alquist-Priolo Earthquake Fault Zones (retrieved Nov 9, 2026) · Zoning classes: our classification of C-ARP-20 as agricultural, checked against the zone description on Oct 24, 2026
Chronological history of building permit applications and issuances, snapshot-dated status changes, State housing entitlements, surrounding development within ½ mile, and area home-value trends.
Permit issued and active for 10.3 yr (first record Jul 14, 2016), with no completion or new permit record in 10.2 yr. · 1 unit · $175,000 declared valuation
Permit issued and active for 4.4 yr (first record Jun 10, 2022), with no completion or new permit record in 4.3 yr. · $27,500 declared valuation
Permit issued and active for 9.2 yr (first record Aug 17, 2017), with no completion or new permit record in 8.8 yr. · 1 unit · $100,000 declared valuation
Permit issued and active for 4.7 yr (first record Mar 11, 2022), with no completion or new permit record in 3.2 yr. · 1 unit · $250,000 declared valuation
Permit issued and active for 4.7 yr (first record Mar 11, 2022), with no completion or new permit record in 3.2 yr. · 1 unit · $200,000 declared valuation
Nearby plumbing / water heater / sewer (11 Church St): First appeared in published agency feed
Record B49045 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby hvac / heat pump (108 Valley Ave): First appeared in published agency feed
Record B48893 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Latest published Zillow Home Value Index (ZHVI) update
Changed from $1,001,898 in September 2025 to $1,093,355 in September 2026.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94971 (not a parcel appraisal)
100 John St · 1 unit · $279,650 valuation
Records span Dec 22, 2025 to May 12, 2026 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
Annual ZIP 94971 home-value index checkpoint
Changed from $1,055,163 in September 2024 to $1,001,898 in September 2025.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94971 (not a parcel appraisal)
Annual ZIP 94971 home-value index checkpoint
Changed from $1,065,842 in September 2023 to $1,055,163 in September 2024.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94971 (not a parcel appraisal)
Annual ZIP 94971 home-value index checkpoint
Changed from $1,121,409 in September 2022 to $1,065,842 in September 2023.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94971 (not a parcel appraisal)
21 Church St · 1 unit · $250,000 valuation
Records span Mar 11, 2022 to Aug 28, 2023 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
23 Church St (Aka 21) · 1 unit · $200,000 valuation
Records span Mar 11, 2022 to Aug 28, 2023 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
Solar / battery storage permit application filed (B31705)
Current status: Issued
10.650Kw roof mount solar system · Declared valuation: $61,060 · Contractor: Ilum Solar
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Solar / battery storage permit issued (B31705)
Recorded status: Issued
10.650Kw roof mount solar system · Declared valuation: $61,060 · Contractor: Ilum Solar
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Annual ZIP 94971 home-value index checkpoint
Changed from $1,098,063 in September 2021 to $1,121,409 in September 2022.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94971 (not a parcel appraisal)
New commercial / non-residential building permit issued (172089)
Recorded status: Issued
New Barn - Ag Exempt · Declared valuation: $27,500 · Contractor: Owner/Builder
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
New commercial / non-residential building permit application filed (172089)
Current status: Issued
New Barn - Ag Exempt · Declared valuation: $27,500 · Contractor: Owner/Builder
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Annual ZIP 94971 home-value index checkpoint
Changed from $882,208 in September 2020 to $1,098,063 in September 2021.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94971 (not a parcel appraisal)
Cross-referenced intelligence from our historical development graph—connecting parcels, permits, entity-resolved builders, empirical review-time distributions, and neighborhood renovation trends.
Explore full Unincorporated Marin development graph →Active in "Issued" for 4.4 yr (first record Jun 10, 2022) with no new permit activity recorded in 4.3 yr.
Active in "Issued" for 10.3 yr (first record Jul 14, 2016) with no new permit activity recorded in 10.2 yr.
Active in "Issued" for 9.2 yr (first record Aug 17, 2017) with no new permit activity recorded in 8.8 yr.
Active in "Issued" for 4.7 yr (first record Mar 11, 2022) with no new permit activity recorded in 3.2 yr.
Active in "Issued" for 4.7 yr (first record Mar 11, 2022) with no new permit activity recorded in 3.2 yr.
| Builder / contractor | Primary specialty | Here / ½ mi | ½ mi valuation | Citywide 24m trend |
|---|---|---|---|---|
| Owner Builder | New single-family home | 3 on parcel8 in ½ mi | $756,000 | 226 vs 240 prior−6% |
| Ilum Solar | Solar / battery storage | 1 on parcel1 in ½ mi | $61,060 | 0 vs 0 prior |
| Cohan Structures Recent nearby: 100 John St (May 12, 2026) | Accessory dwelling unit (new or conversion) | 1 in ½ mi |
| Permit category | Sample (n) | 25th pct | Median (50th) | 75th pct | 90th pct | Recent 24m median |
|---|---|---|---|---|---|---|
| New single-family homeOn this parcel | 121 | 166d | 253d | 456d | 686d | 211d(vs 273d prior) |
| New multifamily / condos / mixed-use | 21 | 272d | 292d | 293d | 313d | 293d(vs 197d prior) |
| Accessory dwelling unit (new or conversion) | 298 | 120d | 204d | 331d | 549d | 214d(vs 181d prior) |
HUD Small Area Fair Market Rent · ZIP 94971
HUD FY 2026 · 40th-percentile gross rentCensus ACS 5-year median gross rent (all bedroom counts combined):
Area home-value benchmarks (not an appraisal)
ZIP & neighborhood mediansUnder California Proposition 13, the seller's historical assessed value does not carry over to a buyer. On sale, the parcel is reassessed at the purchase price: 1.00% base rate ($11,100/yr) + local voter-approved bond debt ($1,665/yr) + fixed direct levies/Mello-Roos ($450/yr).
Mapped hazard zone insurance context on this parcel:
Model adding a backyard ADU or garage conversion under California's Prop 13 blended new-construction assessment (existing house & land tax base stays intact; only ADU build cost is assessed) and SB 13 impact-fee rules.
−$51,592/yr
Cash needed: $244,200
NOI: $15,761/yr
P&I: $5,613/mo
For $0/mo net cash flow
At $3,475/mo gross rent
| Scenario | Assumptions | Year 1 Rent | Year 1 Cash Flow | Cash-on-Cash | Break-Even Rent | Year 5 Cash Flow |
|---|---|---|---|---|---|---|
| Conservative | −8% starting rent, +3% vacancy, +3% combined maintenance/CapEx, 1.5%/yr rent growth | $3,197/mo | −$4,699/mo | -23.1% | $9,756/mo | −$4,674/mo |
| Base (your inputs) | Your entered assumptions, 3.0%/yr rent growth | $3,475/mo | −$4,299/mo | -21.1% | $9,030/mo | −$4,078/mo |
| Optimistic (cap-limited) | +6% starting rent, 3% vacancy, 4.5%/yr rent growth (capped by AB 1482 ceiling of 8.6%/yr) | $3,684/mo | −$4,070/mo | -20.0% | $8,820/mo | −$3,624/mo |
Rental regulatory context (informational only — not legal advice):
California AB 1482 (Tenant Protection Act, Civ. Code § 1947.12) caps annual rent increases at 5% + local CPI (max 10%) on covered properties.
IssuedJun 10, 2022 – Aug 8, 2022
Issued1 unitsJul 14, 2016 – Aug 22, 2016
We group related permits and State housing reports into projects. That grouping is our inference, not an official record.
10.650Kw roof mount solar system
New Barn - Ag Exempt
S F D***Expired T.D. 8/30/16
Install Elec Panel To Pump Water From Tank
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel (APN) · Retrieved Nov 13, 2026 · Received and issued dates come from the County of Marin. The county publishes no final or expired status, so an issued permit stays 'Issued' after the work is done.
No housing activity reported to the State for this parcel (2018–2025 reports).
Source: California HCD, Housing Element Annual Progress Report — Table A2 · Geography: project (parcel) · Retrieved Nov 9, 2026 · From Unincorporated Marin's Housing Element Annual Progress Reports. A project can appear in several report years as it moves from entitlement to permit to completion.
Source: County of Marin GIS (MarinMap), Zoning (11 cities and unincorporated Marin) · Geography: zoning district polygon at parcel point · Retrieved Nov 13, 2026
15.49 acres
Assessor's classification for assessment purposes. This is not zoning.
100 BAY RD
Source: County of Marin GIS (MarinMap), Parcels · Geography: parcel · Retrieved Nov 13, 2026
Search by parcel number 102-120-01. Assessed value is not market value.
Search by parcel number 102-120-01 (Marin County Tax Collector)
Permits issued in unincorporated Marin in the past 48 months. Each city keeps its own records.
The official flood hazard map for this location. Our reading of it is under What could be built here.
This site does not show owner names.
| $279,650 |
| 6 vs 0 prior |
| Addition (adds square footage) | 316 | 103d | 160d | 249d | 440d | 157d(vs 167d prior) |
| Remodel / interior alteration | 1,054 | 36d | 83d | 148d | 266d | 112d(vs 77d prior) |
| Commercial tenant improvement | 81 | 99d | 148d | 233d | 443d | 152d(vs 150d prior) |
| Solar / battery storageOn this parcel | 2,977 | 0d | 0d | 0d | 2d | 0d |
| Electrical / panelOn this parcel | 3,019 | 0d | 0d | 0d | 2d | 0d |
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Computed from issued permits with recorded application and issuance dates over the trailing 60 months. Categories with fewer than 20 permits are excluded.