San Anselmo 94960 · Sleepy Hollow · APN 176-300-28 · Unincorporated Marin
Zoned RSP-1 in Unincorporated Marin with likely ADU & SB 9 infill eligibility and mapped CAL FIRE moderate fire hazard severity zone (state responsibility area) due diligence; benchmark value $2,071,000 ($1,822,000–$2,320,000).
Zoned RSP-1 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 43,255 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
Public building records show issued construction/renovation work on this parcel (7 total permits, latest Oct 16, 2025).
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. 16.4 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.
$2,071,000
Benchmark range: $1,822,000 – $2,320,000
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)
Windows / doors / siding (178422): Issued after 3 mo — slower than 90% of windows / doors / siding permits in Unincorporated Marin (median 0d, 90th pct 5d, n=1,476).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (review-time benchmark)
Closest lead: New home at 99 Garden Rock Rd (0.4 mi W, applied). Inspect timeline history before assuming near-term completion.
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · HCD APR (½-mile radius)
Since November 2024 within ½ mile: 1 homes completed, 1 permitted; 1 commercial or mixed-use project.
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.
226 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 RSP-1 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 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
In "Applied" for 8.4 yr (since Jun 12, 2018), with no new permit record in 8.4 yr. · $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
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
Nearby ev charger (11 Catskill Ct): First appeared in published agency feed
Record B49048 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby roof replacement (16 Dutch Valley Ln): First appeared in published agency feed
Record B49029 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby addition (adds square footage) (15 Estates Dr): Contractor changed from STEVE REMPE GENERAL CONTRACTOR INC to REMPE CONSTRUCTION
Record 182713 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby electrical / panel (185 Van Winkle Dr): First appeared in published agency feed
Record B48979 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby other (41 Katrina Ln): First appeared in published agency feed
Record B48947 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby plumbing / water heater / sewer (5 Dutch Valley Ln): First appeared in published agency feed
Record B48882 · 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)
HVAC / heat pump permit application filed (B44403)
Current status: Issued
Replace furnace and AC w/ air handler and heat pump — Replace Mechanical Appliance · Declared valuation: $18,000 · Contractor: Ernest Ongaro & Sons Inc
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
HVAC / heat pump permit issued (B44403)
Recorded status: Issued
Replace furnace and AC w/ air handler and heat pump — Replace Mechanical Appliance · Declared valuation: $18,000 · Contractor: Ernest Ongaro & Sons Inc
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
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)
135 Tarry Rd (Aka 135 A) · 1 unit · $325,000 valuation
Records span Aug 13, 2024 to Apr 2, 2025 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
Windows / doors / siding permit issued (178422)
Recorded status: Issued
Replace Windows, Doors, Garage Door - Sheetrock & Siding Only In Areas Affected By Window Work · Declared valuation: $254,215 · Contractor: Robert Federighi Inc
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
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)
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 →In "Applied" for 3.1 yr (since Oct 11, 2023), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121). High-impact scale (1 housing unit, $1,200,000 declared valuation across 1 permit).
Issued after 3 mo — slower than 90% of windows / doors / siding permits in Unincorporated Marin (median 0d, 90th pct 5d, n=1,476).
Pending in review for 2.8 yr — slower than 90% of solar / battery storage permits in Unincorporated Marin (median 0d, 90th pct 2d, n=2,977).
Active in "Issued" for 4 yr (first record Oct 25, 2022) with no new permit activity recorded in 12 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 "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).
Substantial improvements (additions, interior remodels, ADUs, commercial TI, and new builds) across 980 parcels
−11.8% YoY
City baseline: 16.4 / 1k
32 in trailing 24m
Includes 5 ADUs
| Builder / contractor | Primary specialty | Here / ½ mi | ½ mi valuation | Citywide 24m trend |
|---|---|---|---|---|
| Avila And Wadlington Contractors | New garage / accessory structure | 1 on parcel2 in ½ mi | $980,000 | 2 vs 0 prior |
| Ernest Ongaro And Sons | HVAC / heat pump | 2 on parcel2 in ½ mi | $25,600 | 0 vs 0 prior |
| Robert Federighi | Windows / doors / siding | 1 on parcel1 in ½ mi | $254,215 |
| 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 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 ($20,700/yr) + local voter-approved bond debt ($3,105/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.
−$119,258/yr
Cash needed: $455,400
NOI: $6,346/yr
P&I: $10,467/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 | −$10,358/mo | -27.3% | $17,816/mo | −$10,402/mo |
| Base (your inputs) | Your entered assumptions, 3.0%/yr rent growth | $3,650/mo | −$9,938/mo | -26.2% | $16,490/mo | −$9,776/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 | −$9,698/mo | -25.6% | $16,107/mo | −$9,299/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.
Replace furnace and AC w/ air handler and heat pump — Replace Mechanical Appliance
Replace Windows, Doors, Garage Door - Sheetrock & Siding Only In Areas Affected By Window Work
7kw roof mount solar array with energy storage system(3 Tesla powerwalls)
7.6kw Rooftop Photovoltaic & Energy Storage System
T/O existing roof, Install New GAF HDZ Comp Shingles, Haul away debris. — ReRoofing
Replace 2 failed tankless WH with 2 new tankless WHs 1'' galvanized dedicated gas line 120' — New Gas Service, Replace Plumbing Fixtures(s)
Rmdl Kit, Office, & 2 Baths, Elect In Other Areas T.D. 12/4/17
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
0.99 acres
Assessor's classification for assessment purposes. This is not zoning.
1433 BUTTERFIELD RD
Source: County of Marin GIS (MarinMap), Parcels · Geography: parcel · Retrieved Nov 13, 2026
Search by parcel number 176-300-28. Assessed value is not market value.
Search by parcel number 176-300-28 (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.
| Sunshine Roofing | Roof replacement | 1 on parcel1 in ½ mi | $30,000 | 0 vs 0 prior |
| Distribugen | Solar / battery storage | 1 on parcel1 in ½ mi | $15,000 | 0 vs 0 prior |
| Owner Builder Recent nearby: 41 Martling Rd (Oct 13, 2025) | Remodel / interior alteration | 21 in ½ mi | $3,857,450 | 226 vs 240 prior−6% |
| Owner Recent nearby: 1500 Butterfield Rd (Sep 1, 2023) | New garage / accessory structure | 13 in ½ mi | $3,439,000 | 25 vs 15 prior+67% |
| Levine Design And Construction Recent nearby: 145 Crane Dr (May 16, 2016) | New garage / accessory structure | 5 in ½ mi | $890,000 | 1 vs 4 prior |
| Fisher Development Recent nearby: 1500 Butterfield Rd (May 11, 2021) | Commercial tenant improvement | 4 in ½ mi | $3,337,765 | 0 vs 0 prior |
| Dotto Construction Recent nearby: 125 Tarry Rd (Dec 4, 2024) | Remodel / interior alteration | 4 in ½ mi | $950,000 | 1 vs 9 prior−89% |
| 316 |
| 103d |
| 160d |
| 249d |
| 440d |
| 157d(vs 167d prior) |
| Remodel / interior alterationOn this parcel | 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.