Fairfax 94930 · Unincorporated Fairfax · APN 174-280-07 · Unincorporated Marin
Zoned RSP-0.05 in Unincorporated Marin with likely ADU & SB 9 infill eligibility and mapped CAL FIRE high fire hazard severity zone (state responsibility area) due diligence; benchmark value $1,290,000 ($1,135,000–$1,445,000).
Zoned RSP-0.05 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 769,008 sq ft lot.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
Public building records show issued construction/renovation work on this parcel (11 total permits, latest Oct 7, 2024).
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)
Automated synthesis of indexed municipal, county, state, and federal public records — informational context only, not a formal appraisal, survey, or legal/tax determination.
15 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
$1,290,000
Benchmark range: $1,135,000 – $1,445,000
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)
Closest lead: 54 new homes (0.48 mi NE, 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)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$1,274/mo). Confirm exact Mello-Roos / CFD special assessments on the county tax bill.
Source: CA Const. Art. XIIIA (Prop 13) · County Tax Collector
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 RSP-0.05 as single-family residential, 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 8 yr (first record Nov 26, 2018), with no completion or new permit record in 8 yr. · 54 units
Latest published Zillow Home Value Index (ZHVI) update
Changed from $1,169,780 in September 2025 to $1,233,096 in September 2026.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94930 (not a parcel appraisal)
Annual ZIP 94930 home-value index checkpoint
Changed from $1,215,573 in September 2024 to $1,169,780 in September 2025.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94930 (not a parcel appraisal)
General repair permit issued (177784)
Recorded status: Issued
Slope & Roadway Remediation For Roadway Edge Failure · Declared valuation: $50,000 · Contractor: Westward Builders Llc
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Annual ZIP 94930 home-value index checkpoint
Changed from $1,214,660 in September 2023 to $1,215,573 in September 2024.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94930 (not a parcel appraisal)
General repair permit application filed (177784)
Current status: Issued
Slope & Roadway Remediation For Roadway Edge Failure · Declared valuation: $50,000 · Contractor: Westward Builders Llc
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Annual ZIP 94930 home-value index checkpoint
Changed from $1,278,920 in September 2022 to $1,214,660 in September 2023.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94930 (not a parcel appraisal)
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
Solar / battery storage permit application filed (B31458)
Current status: Issued
PHOTOVOLTAIC - RESIDENTIAL FLUSH AND TILT ROOF MOUNT, GRID-TIED. AC COUPLED BATTERY INSTALLATION WITH (2) ENPHASE 10kWH BATTERY UNITS. PV SYSTEM SIZE 9.60 kW (DC STC) · Declared valuation: $67,000 · Contractor: Sonomarin Solar_inc
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Solar / battery storage permit issued (B31458)
Recorded status: Issued
PHOTOVOLTAIC - RESIDENTIAL FLUSH AND TILT ROOF MOUNT, GRID-TIED. AC COUPLED BATTERY INSTALLATION WITH (2) ENPHASE 10kWH BATTERY UNITS. PV SYSTEM SIZE 9.60 kW (DC STC) · Declared valuation: $67,000 · Contractor: Sonomarin Solar_inc
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Annual ZIP 94930 home-value index checkpoint
Changed from $1,178,018 in September 2021 to $1,278,920 in September 2022.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94930 (not a parcel appraisal)
Annual ZIP 94930 home-value index checkpoint
Changed from $987,042 in September 2020 to $1,178,018 in September 2021.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94930 (not a parcel appraisal)
Plumbing / water heater / sewer permit issued (163772)
Recorded status: Issued
New Water Line · Declared valuation: $2,000
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Solar / battery storage permit application filed (163491)
Current status: Issued
Solar Roof 7.25028 K W - Express · Declared valuation: $32,490 · Contractor: Tesla Energy
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Solar / battery storage permit application filed (163492)
Current status: Issued
Battery Storage - Express · Declared valuation: $32,490 · Contractor: Tesla Energy
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
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 8 yr (first record Nov 26, 2018) with no new permit activity recorded in 8 yr. High-impact scale (54 housing units, 54 deed-restricted affordable across 0 permits).
High-impact scale (54 housing units, 54 deed-restricted affordable across 0 permits).
Substantial improvements (additions, interior remodels, ADUs, commercial TI, and new builds) across 470 parcels
Small prior baseline
City baseline: 16.4 / 1k
6 in trailing 24m
Includes 1 ADUs
| Builder / contractor | Primary specialty | Here / ½ mi | ½ mi valuation | Citywide 24m trend |
|---|---|---|---|---|
| Tesla Energy | Solar / battery storage | 3 on parcel3 in ½ mi | $78,900 | 0 vs 0 prior |
| Ernest Ongaro And Sons | Electrical / panel | 3 on parcel3 in ½ mi | $22,000 | 0 vs 0 prior |
| Sonomarin Solar_inc | Solar / battery storage | 1 on parcel1 in ½ mi | $67,000 | 0 |
| Permit category | Sample (n) | 25th pct | Median (50th) | 75th pct | 90th pct | Recent 24m median |
|---|---|---|---|---|---|---|
| New single-family home | 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) |
| Addition (adds square footage) |
HUD Small Area Fair Market Rent · ZIP 94930
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 ($12,900/yr) + local voter-approved bond debt ($1,935/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.
−$66,674/yr
Cash needed: $283,800
NOI: $11,601/yr
P&I: $6,523/mo
For $0/mo net cash flow
At $3,250/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 | $2,990/mo | −$5,930/mo | -25.1% | $11,267/mo | −$5,929/mo |
| Base (your inputs) | Your entered assumptions, 3.0%/yr rent growth | $3,250/mo | −$5,556/mo | -23.5% | $10,429/mo | −$5,371/mo |
| Optimistic (cap-limited) | +6% starting rent, 3% vacancy, 4.5%/yr rent growth (capped by AB 1482 ceiling of 8.6%/yr) | $3,445/mo | −$5,342/mo | -22.6% | $10,186/mo | −$4,947/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.
Slope & Roadway Remediation For Roadway Edge Failure
PHOTOVOLTAIC - RESIDENTIAL FLUSH AND TILT ROOF MOUNT, GRID-TIED. AC COUPLED BATTERY INSTALLATION WITH (2) ENPHASE 10kWH BATTERY UNITS. PV SYSTEM SIZE 9.60 kW (DC STC)
New Water Line
Reroof
Battery Storage - Express
Solar Roof 7.25028 K W - Express
REPLACE 17 WINDOWS, SAME SIZE & LOCATION — Non-structural Door/Window Replacement
run approx 70 feet of new gas pipe from PG&E meter to kitchen stove and outside BBQ — New Gas Service
200 amp sub panel replacement in same location in hallway, like for like — Service Upgrade
install 4 zone ductless mini split New- to service master bedroom, living room and kids bedrooms outdoor model # AOU45RLXFZ and install 2 zone ductless mini split New- to service kitchen and spare bedroom outdoor model # AOU18RLXFZ electrical by others — Mechanical Appliance
Change out of Tanked unit with New tankless Navien 240A unit — Replace Plumbing Fixtures(s)
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
17.65 acres
Assessor's classification for assessment purposes. This is not zoning.
300 BOTHIN RD
Source: County of Marin GIS (MarinMap), Parcels · Geography: parcel · Retrieved Nov 13, 2026
Search by parcel number 174-280-07. Assessed value is not market value.
Search by parcel number 174-280-07 (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.
| Westward Builders | General repair | 1 on parcel1 in ½ mi | $50,000 | 0 vs 0 prior |
| Float Glass And Mirror | Electrical / panel | 1 on parcel1 in ½ mi | $43,873 | 0 vs 0 prior |
| Divine Electric | Electrical / panel | 1 on parcel1 in ½ mi | $4,000 | 2 vs 1 prior |
| Jam Construction Recent nearby: 555 Iron Springs Rd (May 11, 2022) | Remodel / interior alteration | 1 in ½ mi | $472,000 | 0 vs 0 prior |
| 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 |
| Roof replacementOn this parcel | 3,663 | 0d | 0d | 0d | 0d | 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.