San Rafael 94903 · Marinwood · APN 164-084-06 · 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 $1,306,000 ($1,149,000–$1,463,000).
Zoned R1 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 9,932 sq ft lot. Local precedent is active with 2 ADU permits 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 Sep 17, 2025, 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.
Since November 2024 within ½ mile: 2 permitted.
2 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.
169 permits within ½ mile since November 2024
$1,306,000
Benchmark range: $1,149,000 – $1,463,000
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)
Addition (adds square footage) (91510): Pending in review for 3.1 yr (7.2× the 160d median) — slower than 90% of addition (adds square footage) permits in Unincorporated Marin (median 160d, 90th pct 440d, n=316).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (review-time benchmark)
Closest lead: Accessory dwelling unit at 598 Loganberry Dr (adu 598a) (0.21 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)
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 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 2.6 yr (first record Apr 5, 2024), with no completion or new permit record in 2.3 yr. · $85,000 declared valuation
Permit issued and active for 2.2 yr (first record Sep 6, 2024), with no completion or new permit record in 22 mo. · 1 unit · $830,000 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 other (913 Appleberry Dr): First appeared in published agency feed
Record B49034 · 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 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 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
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)
712 Appleberry Dr · 1 unit · $185,000 valuation
Records span Jul 8, 2026 to Sep 21, 2026 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
Annual ZIP 94903 home-value index checkpoint
Changed from $1,237,445 in September 2024 to $1,200,587 in September 2025.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94903 (not a parcel appraisal)
Plumbing / water heater / sewer permit application filed (B43928)
Current status: Issued
Tankless hot water heater installation — New Plumbing Fixture(s) · Declared valuation: $3,800 · Contractor: United V I Plumbing
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Plumbing / water heater / sewer permit issued (B43928)
Recorded status: Issued
Tankless hot water heater installation — New Plumbing Fixture(s) · Declared valuation: $3,800 · Contractor: United V I Plumbing
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
598 Loganberry Dr (Adu 598a) · 1 unit · $830,000 valuation
Records span Sep 6, 2024 to Jan 9, 2025 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
Annual ZIP 94903 home-value index checkpoint
Changed from $1,210,123 in September 2023 to $1,237,445 in September 2024.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94903 (not a parcel appraisal)
Plumbing / water heater / sewer permit application filed (B39600)
Current status: Issued
Remodel existing kitchen by removing existing finishes down to the studs and replacing drywall, cabinets, appliances, plumbing fixtures, lighting fixtures and other finishes. Replace existing single pane windows and sliding doors with new thermal glazed, low-e aluminum framed units in the same size. Replace existing baseboard hydronic heaters with in floor hydronic heat. No structural work. · Declared valuation: $215,000 · Contractor: Charles & Sons Builders Inc
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 →Pending in review for 3.1 yr (7.2× the 160d median) — slower than 90% of addition (adds square footage) permits in Unincorporated Marin (median 160d, 90th pct 440d, n=316).
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 "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).
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).
Active in "Issued" for 7 yr (first record Nov 18, 2019) with no new permit activity recorded in 7 yr.
Active in "Issued" for 2.6 yr (first record Apr 5, 2024) with no new permit activity recorded in 2.3 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 |
|---|---|---|---|---|
| Charles And Sons Builders | Plumbing / water heater / sewer | 1 on parcel1 in ½ mi | $215,000 | 2 vs 2 prior |
| Silveira Enterprise | Electrical / panel | 1 on parcel1 in ½ mi | $25,000 | 0 vs 0 prior |
| Abril Roofing | Roof replacement | 1 on parcel1 in ½ mi | $20,000 | 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 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 ($13,050/yr) + local voter-approved bond debt ($1,958/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.
−$59,166/yr
Cash needed: $287,100
NOI: $20,020/yr
P&I: $6,599/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 | −$5,410/mo | -22.6% | $11,393/mo | −$5,373/mo |
| Base (your inputs) | Your entered assumptions, 3.0%/yr rent growth | $4,175/mo | −$4,930/mo | -20.6% | $10,545/mo | −$4,657/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 | −$4,655/mo | -19.5% | $10,300/mo | −$4,111/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.
Tankless hot water heater installation — New Plumbing Fixture(s)
Remodel existing kitchen by removing existing finishes down to the studs and replacing drywall, cabinets, appliances, plumbing fixtures, lighting fixtures and other finishes. Replace existing single pane windows and sliding doors with new thermal glazed, low-e aluminum framed units in the same size. Replace existing baseboard hydronic heaters with in floor hydronic heat. No structural work.
Circuits for future kitchen remodel, add recessed cans and replace two bathroom exhaust fan — New Circuits / Outlets, Replace Circuits / Outlets
Apply polyurethane foam roof overlay. — ReRoofing
Interior Remodel; Addition
upgrade from 100A to 200A — Service Upgrade
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
0.23 acres
Assessor's classification for assessment purposes. This is not zoning.
674 IDYLBERRY RD
Source: County of Marin GIS (MarinMap), Parcels · Geography: parcel · Retrieved Nov 13, 2026
Search by parcel number 164-084-06. Assessed value is not market value.
Search by parcel number 164-084-06 (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.
| United Vi Plumbing | Plumbing / water heater / sewer | 1 on parcel1 in ½ mi | $3,800 | 0 vs 0 prior |
| Sonomarin Solar_inc | Electrical / panel | 1 on parcel1 in ½ mi | $3,000 | 0 vs 0 prior |
| Owner Builder Recent nearby: 546 Pinewood Dr (May 28, 2026) | Remodel / interior alteration | 29 in ½ mi | $3,987,200 | 226 vs 240 prior−6% |
| Owner Recent nearby: 775 Miller Creek Rd (Sep 15, 2020) | Remodel / interior alteration | 6 in ½ mi | $521,300 | 25 vs 15 prior+67% |
| Smollen The Builder Recent nearby: 823 Greenberry Ln (Jul 22, 2020) | Remodel / interior alteration | 3 in ½ mi | $300,000 | 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 |
| Swan Pools Recent nearby: 801 Appleberry Dr (Jun 1, 2023) | Pool / spa | 3 in ½ mi | $107,000 | 1 vs 4 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.