San Anselmo 94960 · Sleepy Hollow · APN 176-280-18 · Unincorporated Marin
Zoned RMP-0.2 in Unincorporated Marin with likely ministerial ADU eligibility and mapped CAL FIRE moderate fire hazard severity zone (state responsibility area) due diligence; benchmark value $1,820,000 ($1,602,000–$2,038,000).
Zone RMP-0.2 allows residential use qualifying for ministerial ADU review under state law.
Source: Unincorporated Marin zoning · CA Gov. Code 66314
Public building records show issued construction/renovation work on this parcel (4 total permits, latest Feb 23, 2024).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
32 substantial renovation & housing permits over 24 months (32.7 per 1,000 parcels vs. 16.3 citywide baseline) (#4 of 22 neighborhoods).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (Sleepy Hollow)
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 homes completed; 1 commercial or mixed-use project.
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.
118 permits within ½ mile since November 2024
$1,820,000
Benchmark range: $1,602,000 – $2,038,000
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)
Closest lead: New home at 121 Van Tassel Ct (0.32 mi SW, 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 (~$1,782/mo). Confirm exact Mello-Roos / CFD special assessments on the county tax bill.
Source: CA Const. Art. XIIIA (Prop 13) · County Tax Collector
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 14, 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.
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 14, 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 RMP-0.2 as multifamily 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 11.8 yr (first record Jan 13, 2015), with no completion or new permit record in 11 yr. · $40,000 declared valuation
Permit issued and active for 10.9 yr (first record Dec 23, 2015), with no completion or new permit record in 10.6 yr. · 1 unit · $615,000 declared valuation
In "Applied" for 10.5 yr (since May 2, 2016), with no new permit record in 10.5 yr. · $2,500,000 declared valuation
Permit issued and active for 8.7 yr (first record Feb 21, 2018), with no completion or new permit record in 8.4 yr. · 1 unit · $800,000 declared valuation
In "Applied" for 7.5 yr (since May 15, 2019), with no new permit record in 7.5 yr. · $2,500,000 declared valuation
In "Applied" for 3.9 yr (since Dec 27, 2022), with no new permit record in 3.9 yr. · 1 unit · $100,000 declared valuation
Nearby windows / doors / siding (100 Crane Dr): First appeared in published agency feed
Record B49067 · 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 $1,602,637 in September 2025 to $1,702,818 in September 2026.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94960 (not a parcel appraisal)
1500 Butterfield Rd · $2,700,000 valuation
Records span Oct 25, 2022 to Oct 28, 2025 (2 permits).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
Annual ZIP 94960 home-value index checkpoint
Changed from $1,657,204 in September 2024 to $1,602,637 in September 2025.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94960 (not a parcel appraisal)
26 Irving Dr (Adu 26a) · 1 unit · $299,000 valuation
Records span May 10, 2024 to Dec 10, 2024 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
15 Van Ripper Ct (Adu 15a) · 1 unit · $315,000 valuation
Records span Jun 6, 2024 to Oct 30, 2024 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
Annual ZIP 94960 home-value index checkpoint
Changed from $1,652,687 in September 2023 to $1,657,204 in September 2024.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94960 (not a parcel appraisal)
11 Katrina Ln (Adu 11a) · 1 unit · $575,000 valuation
Records span Feb 12, 2024 to Jul 24, 2024 (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 (B37113)
Current status: Issued
(NEW) 27.0 KWH BATTERY STORAGE ADDED TO EXISTING PV SYSTEM · Declared valuation: $36,940 · Contractor: Solarcraft Services
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Solar / battery storage permit issued (B37113)
Recorded status: Issued
(NEW) 27.0 KWH BATTERY STORAGE ADDED TO EXISTING PV SYSTEM · Declared valuation: $36,940 · Contractor: Solarcraft Services
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Annual ZIP 94960 home-value index checkpoint
Changed from $1,730,005 in September 2022 to $1,652,687 in September 2023.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94960 (not a parcel appraisal)
26 Irving Dr · 1 unit · $200,000 valuation
Records span Jan 17, 2023 to Jul 31, 2023 (2 permits).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
43 Irving Dr · 1 unit · $100,000 valuation
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
Annual ZIP 94960 home-value index checkpoint
Changed from $1,581,948 in September 2021 to $1,730,005 in September 2022.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94960 (not a parcel appraisal)
Windows / doors / siding permit application filed (B30735)
Current status: Issued
Remove existing cedar shingle siding and replace with new drainage fabric and new fire resistant Hardie lap siding. Remove and replace 7 aluminum windows with new tempered dual-pane Low E windows. Window dimensions and locations to remain the same. — Siding Replacement, Non-structural Door/Window Replacement · Declared valuation: $115,000 · Contractor: Tom Gawronski Contractor 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 →Active in "Issued" for 8.7 yr (first record Feb 21, 2018) with no new permit activity recorded in 8.4 yr. High-impact scale (1 housing unit, $800,000 declared valuation across 1 permit).
Active in "Issued" for 4.1 yr (first record Oct 25, 2022) with no new permit activity recorded in 13 mo. High-impact scale ($2,700,000 declared valuation across 2 permits).
Active in "Applied" for 7.5 yr (first record May 15, 2019) with no new permit activity recorded in 7.5 yr. High-impact scale ($2,500,000 declared valuation across 2 permits).
Active in "Applied" for 10.5 yr (first record May 2, 2016) with no new permit activity recorded in 10.5 yr. High-impact scale ($2,500,000 declared valuation across 2 permits).
In "Applied" for 3.9 yr (since Dec 27, 2022), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
In "Applied" for 3.8 yr (since Jan 17, 2023), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
Substantial improvements (additions, interior remodels, ADUs, commercial TI, and new builds) across 980 parcels
−11.8% YoY
City baseline: 16.3 / 1k
32 in trailing 24m
Includes 5 ADUs
| Builder / contractor | Primary specialty | Here / ½ mi | ½ mi valuation | Citywide 24m trend |
|---|---|---|---|---|
| Solarcraft Services | Solar / battery storage | 3 on parcel3 in ½ mi | $77,940 | 0 vs 0 prior |
| Tom Gawronski Contractor | Windows / doors / siding | 1 on parcel1 in ½ mi | $115,000 | 0 vs 0 prior |
| Owner Builder Recent nearby: 41 Martling Rd (Oct 13, 2025) | Remodel / interior alteration | 13 in ½ mi | $3,060,950 |
| Permit category | Sample (n) | 25th pct | Median (50th) | 75th pct | 90th pct | Recent 24m median |
|---|---|---|---|---|---|---|
| New single-family home | 121 | 166d | 253d | 456d | 686d | 210d(vs 276d 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 94960
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 ($18,200/yr) + local voter-approved bond debt ($2,730/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.
−$101,214/yr
Cash needed: $400,400
NOI: $9,221/yr
P&I: $9,203/mo
For $0/mo net cash flow
At $3,650/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 | $3,358/mo | −$8,854/mo | -26.5% | $15,717/mo | −$8,879/mo |
| Base (your inputs) | Your entered assumptions, 3.0%/yr rent growth | $3,650/mo | −$8,434/mo | -25.3% | $14,547/mo | −$8,252/mo |
| Optimistic (cap-limited) | +6% starting rent, 3% vacancy, 4.5%/yr rent growth (capped by AB 1482 ceiling of 8.6%/yr) | $3,869/mo | −$8,194/mo | -24.6% | $14,209/mo | −$7,776/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) 27.0 KWH BATTERY STORAGE ADDED TO EXISTING PV SYSTEM
Remove existing cedar shingle siding and replace with new drainage fabric and new fire resistant Hardie lap siding. Remove and replace 7 aluminum windows with new tempered dual-pane Low E windows. Window dimensions and locations to remain the same. — Siding Replacement, Non-structural Door/Window Replacement
Repl Sub Panel
Roof Solar 9.77 Kw - Express
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel (APN) · Retrieved Nov 14, 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 14, 2026
5.78 acres
Assessor's classification for assessment purposes. This is not zoning.
84 IRVING DR
Source: County of Marin GIS (MarinMap), Parcels · Geography: parcel · Retrieved Nov 14, 2026
Search by parcel number 176-280-18. Assessed value is not market value.
Search by parcel number 176-280-18 (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.
| 226 vs 240 prior−6% |
| Owner Recent nearby: 1500 Butterfield Rd (Sep 1, 2023) | Remodel / interior alteration | 5 in ½ mi | $2,950,000 | 25 vs 15 prior+67% |
| Fisher Development Recent nearby: 1500 Butterfield Rd (May 11, 2021) | Commercial tenant improvement | 4 in ½ mi | $3,337,765 | 0 vs 0 prior |
| Redican Homes Recent nearby: 115 Van Tassel Ct (May 11, 2023) | Addition (adds square footage) | 3 in ½ mi | $696,700 | 1 vs 2 prior |
| Womack Construction Recent nearby: 160 Crane Dr (Feb 8, 2021) | Remodel / interior alteration | 3 in ½ mi | $460,000 | 0 vs 0 prior |
| Bear State Construction Recent nearby: 1500 Butterfield Rd (Jul 7, 2016) | Commercial tenant improvement | 3 in ½ mi | $452,143 | 0 vs 0 prior |
| Salinas General Contractor Recent nearby: 1500 Butterfield Rd (Dec 3, 2024) | Addition (adds square footage) | 3 in ½ mi | $379,115 | 1 vs 0 prior |
| Swan Pools Recent nearby: 114 Van Tassel Ct (Oct 31, 2025) | Pool / spa | 3 in ½ mi | $231,000 | 1 vs 4 prior |
| 316 |
| 103d |
| 160d |
| 249d |
| 440d |
| 159d(vs 166d 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 | 3,020 | 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.