San Rafael 94903 · Marinwood · APN 164-094-13 · Unincorporated Marin
Zoned R1 in Unincorporated Marin with likely ADU & SB 9 infill eligibility and mapped CAL FIRE high fire hazard severity zone (local responsibility area) due diligence; benchmark value $1,296,000 ($1,140,000–$1,452,000).
Zoned R1 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 8,973 sq ft lot. Local precedent is active with 1 ADU permit within ¼ mile over the last 36 months.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
On-parcel permit history is indexed through Oct 20, 2026, letting you verify roof, HVAC, electrical, or structural work against seller disclosures.
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.
$1,296,000
Benchmark range: $1,140,000 – $1,452,000
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 Mar 24, 2025)
Closest lead: Accessory dwelling unit at 598 Loganberry Dr (adu 598a) (470 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)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$1,280/mo). Confirm exact Mello-Roos / CFD special assessments on the county tax bill.
Source: CA Const. Art. XIIIA (Prop 13) · County Tax Collector
Since November 2024 within ½ mile: 3 permitted.
3 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.
220 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
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.
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 R1 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 10.1 yr (first record Oct 17, 2016), with no completion or new permit record in 9.7 yr. · 1 unit · $185,000 declared valuation
Permit issued and active for 8.2 yr (first record Sep 10, 2018), with no completion or new permit record in 8.2 yr. · $9,500 declared valuation
Permit issued and active for 7 yr (first record Nov 18, 2019), with no completion or new permit record in 7 yr. · $2,000 declared valuation
In "Entitled" for 6.6 yr (since Apr 8, 2020), with no new permit record in 6.6 yr. · 1 unit
In "Applied" for 5.5 yr (since May 28, 2021), with no new permit record in 5.5 yr. · 1 unit · $110,000 declared valuation
Permit issued and active for 4.8 yr (first record Jan 10, 2022), with no completion or new permit record in 4.6 yr. · 1 unit · $350,000 declared valuation
Nearby remodel / interior alteration (515 Pinewood Dr): First appeared in published agency feed
Record 182948 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby remodel / interior alteration (515 Pinewood Dr): No longer present in latest agency feed
Record 94393 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby addition (adds square footage) (2195 Las Gallinas Ave): Contractor changed from (blank) to BOLT DOWN THE BAY AREA
Record 182899 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby windows / doors / siding (435 Pinewood Dr): First appeared in published agency feed
Record B49047 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby roof replacement (2120 Elderberry Ln): First appeared in published agency feed
Record B48915 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby plumbing / water heater / sewer (320 Quietwood Dr): First appeared in published agency feed
Record B49024 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby windows / doors / siding (550 Miller Creek Rd): First appeared in published agency feed
Record B49019 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby addition (adds square footage) (2195 Las Gallinas Ave): First appeared in published agency feed
Record 182899 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby ev charger (475 Pinewood Dr): First appeared in published agency feed
Record B48993 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby other (475 Pinewood Dr): First appeared in published agency feed
Record B48992 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby addition (adds square footage) (2195 Las Gallinas Ave): No longer present in latest agency feed
Record 94431 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby roof replacement (2195 Las Gallinas Ave): First appeared in published agency feed
Record B48888 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Electrical / panel permit application filed (B48834)
Current status: Issued
New Circuits / Outlets, Service Upgrade · Declared valuation: $3,500 · Contractor: Silveira Enterprise Inc
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Electrical / panel permit issued (B48834)
Recorded status: Issued
New Circuits / Outlets, Service Upgrade · Declared valuation: $3,500 · Contractor: Silveira Enterprise Inc
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Latest published Zillow Home Value Index (ZHVI) update
Changed from $1,200,587 in September 2025 to $1,250,063 in September 2026.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94903 (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 2.2 yr (first record Sep 6, 2024) with no new permit activity recorded in 22 mo. High-impact scale (1 housing unit, $830,000 declared valuation across 1 permit).
In "Entitled" for 6.6 yr (since Apr 8, 2020), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
In "Applied" for 5.5 yr (since May 28, 2021), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
Active in "Issued" for 10.1 yr (first record Oct 17, 2016) with no new permit activity recorded in 9.7 yr.
Active in "Issued" for 3.1 yr (first record Oct 11, 2023) with no new permit activity recorded in 19 mo.
Active in "Issued" for 4.8 yr (first record Jan 10, 2022) with no new permit activity recorded in 4.6 yr.
Substantial improvements (additions, interior remodels, ADUs, commercial TI, and new builds) across 1,737 parcels
−23.1% YoY
City baseline: 16.4 / 1k
23 in trailing 24m
Includes 15 ADUs
| Builder / contractor | Primary specialty | Here / ½ mi | ½ mi valuation | Citywide 24m trend |
|---|---|---|---|---|
| Divine Electric | Electrical / panel | 2 on parcel2 in ½ mi | $13,652 | 2 vs 1 prior |
| Abril Roofing | Roof replacement | 1 on parcel1 in ½ mi | $25,000 | 0 vs 0 prior |
| Silveira Enterprise | Electrical / panel | 1 on parcel1 in ½ mi | $3,500 | 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 94903
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 ($12,950/yr) + local voter-approved bond debt ($1,943/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.
−$58,444/yr
Cash needed: $284,900
NOI: $20,135/yr
P&I: $6,548/mo
For $0/mo net cash flow
At $4,175/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 | $3,841/mo | −$5,350/mo | -22.5% | $11,309/mo | −$5,312/mo |
| Base (your inputs) | Your entered assumptions, 3.0%/yr rent growth | $4,175/mo | −$4,870/mo | -20.5% | $10,467/mo | −$4,596/mo |
| Optimistic (cap-limited) | +6% starting rent, 3% vacancy, 4.5%/yr rent growth (capped by AB 1482 ceiling of 8.6%/yr) | $4,426/mo | −$4,595/mo | -19.4% | $10,224/mo | −$4,050/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.
New Circuits / Outlets, Service Upgrade
200A Panel Upgrade — Service Upgrade
200A Main Panel Upgrade — Service Upgrade
Flat section - Apply polyurethane foam overlay over tar and gravel roof. Pitch section - Tear off old shingles install new — ReRoofing
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
0.21 acres
Assessor's classification for assessment purposes. This is not zoning.
585 KERNBERRY DR
Source: County of Marin GIS (MarinMap), Parcels · Geography: parcel · Retrieved Nov 13, 2026
Search by parcel number 164-094-13. Assessed value is not market value.
Search by parcel number 164-094-13 (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.
| Owner Builder Recent nearby: 460 Miller Creek Rd (Jun 5, 2026) | Remodel / interior alteration | 34 in ½ mi | $3,041,300 | 226 vs 240 prior−6% |
| Owner Recent nearby: 435 Peachstone Ter (Sep 6, 2024) | Remodel / interior alteration | 12 in ½ mi | $986,300 | 25 vs 15 prior+67% |
| Gelardi Construction Recent nearby: 417 Miller Creek Rd (Aug 13, 2024) | Addition (adds square footage) | 3 in ½ mi | $642,420 | 0 vs 1 prior |
| Towey Construction Recent nearby: 575 Loganberry Dr (Oct 31, 2016) | Addition (adds square footage) | 3 in ½ mi | $314,500 | 0 vs 0 prior |
| Hamta Partners Recent nearby: 2187 Danberry Ln (Jul 23, 2018) | Remodel / interior alteration | 3 in ½ mi | $177,000 | 2 vs 0 prior |
| Hsc Services Recent nearby: 377 Quietwood Dr (May 4, 2022) | New single-family home | 2 in ½ mi | $768,000 | 1 vs 0 prior |
| G Family Construction Recent nearby: 410 Quietwood Dr (Feb 1, 2022) | Addition (adds square footage) | 2 in ½ mi | $307,173 | 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) |
| Roof replacementOn this parcel | 3,663 | 0d | 0d | 0d | 0d | 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.