Tiburon 94920 · Unincorporated Tiburon · APN 039-041-26 · Unincorporated Marin
Zoned R1-B2 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 $3,211,000 ($2,826,000–$3,596,000).
Zoned R1-B2 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 15,551 sq ft lot.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
On-parcel permit history is indexed through Oct 12, 2022, 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 proposed or in review.
4 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.
43 permits within ½ mile since November 2024
$3,211,000
Benchmark range: $2,826,000 – $3,596,000
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: New home at 3820 Paradise Dr (0.47 mi SE, 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)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$3,115/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 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-B2 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 12.7 yr (first record Feb 13, 2014), with no completion or new permit record in 11.4 yr. · 1 unit · $2,240,000 declared valuation
Permit issued and active for 11.4 yr (first record Jun 2, 2015), with no completion or new permit record in 11.1 yr. · 1 unit · $543,000 declared valuation
In "Applied" for 5.4 yr (since Jun 23, 2021), with no new permit record in 5.4 yr. · 1 unit · $3,800,000 declared valuation
Permit issued and active for 4.4 yr (first record Jun 2, 2022), with no completion or new permit record in 4.2 yr. · 1 unit · $40,000 declared valuation
Permit issued and active for 3.8 yr (first record Feb 9, 2023), with no completion or new permit record in 3.8 yr. · 1 unit
Permit issued and active for 4.4 yr (first record Jun 9, 2022), with no completion or new permit record in 3.6 yr. · 1 unit · $105,000 declared valuation
Nearby electrical / panel (3860 Paradise Dr): First appeared in published agency feed
Record 94630 · 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 $3,090,631 in September 2025 to $3,404,730 in September 2026.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94920 (not a parcel appraisal)
4095 Paradise Dr · 1 unit · $2,100,000 valuation
Records span Nov 10, 2025 to Sep 21, 2026 (2 permits).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
3840 Paradise Dr · 1 unit · $100,000 valuation
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
3860 Paradise Dr Aka · 1 unit · $1,400,000 valuation
Records span Jan 23, 2024 to Oct 14, 2025 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
Annual ZIP 94920 home-value index checkpoint
Changed from $3,209,701 in September 2024 to $3,090,631 in September 2025.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94920 (not a parcel appraisal)
1 unit
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
Annual ZIP 94920 home-value index checkpoint
Changed from $3,258,065 in September 2023 to $3,209,701 in September 2024.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94920 (not a parcel appraisal)
1 unit
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
3900 Paradise Dr · $65,000 valuation
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
4060 Paradise Dr · $3,000 valuation
Records span Nov 15, 2023 to Jul 9, 2024 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
3870 Paradise Dr · 1 unit · $2,100,000 valuation
Records span Mar 22, 2023 to Mar 5, 2024 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
Annual ZIP 94920 home-value index checkpoint
Changed from $3,353,968 in September 2022 to $3,258,065 in September 2023.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94920 (not a parcel appraisal)
4126 Paradise Dr (Aka 4126a) · 1 unit · $105,000 valuation
Records span Jun 9, 2022 to Apr 20, 2023 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
1 unit
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 5.4 yr (since Jun 23, 2021), 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, $3,800,000 declared valuation across 1 permit).
Active in "Issued" for 3.6 yr (first record Mar 22, 2023) with no new permit activity recorded in 2.7 yr. High-impact scale (1 housing unit, $2,100,000 declared valuation across 1 permit).
Active in "Issued" for 2.8 yr (first record Jan 23, 2024) with no new permit activity recorded in 13 mo. High-impact scale (1 housing unit, $1,400,000 declared valuation across 1 permit).
Active in "Issued" for 12.7 yr (first record Feb 13, 2014) with no new permit activity recorded in 11.4 yr. High-impact scale (1 housing unit, $2,240,000 declared valuation across 2 permits).
In "Applied" for 2.3 yr (since Jul 16, 2024), exceeding the 55d median and 261d 90th percentile for demolition permits in Unincorporated Marin (n=130).
Active in "Issued" for 4.4 yr (first record Jun 2, 2022) with no new permit activity recorded in 4.2 yr.
| Builder / contractor | Primary specialty | Here / ½ mi | ½ mi valuation | Citywide 24m trend |
|---|---|---|---|---|
| Wedge Roofing | Roof replacement | 1 on parcel1 in ½ mi | $45,700 | 0 vs 0 prior |
| Shining Star Electric | Electrical / panel | 1 on parcel1 in ½ mi | $5,000 | 0 vs 0 prior |
| Dans Plumbing And Sewer Service | Plumbing / water heater / sewer | 1 on parcel1 in ½ mi | $4,175 |
| 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 94920
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 ($32,100/yr) + local voter-approved bond debt ($4,815/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.
−$197,362/yr
Cash needed: $706,200
NOI: -$2,584/yr
P&I: $16,232/mo
For $0/mo net cash flow
At $4,100/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 | $3,772/mo | −$16,918/mo | -28.7% | $27,387/mo | −$17,034/mo |
| Base (your inputs) | Your entered assumptions, 3.0%/yr rent growth | $4,100/mo | −$16,447/mo | -27.9% | $25,349/mo | −$16,331/mo |
| Optimistic (cap-limited) | +6% starting rent, 3% vacancy, 4.5%/yr rent growth (capped by AB 1482 ceiling of 8.6%/yr) | $4,346/mo | −$16,176/mo | -27.5% | $24,761/mo | −$15,796/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.
Electrical service upgrade from 100 amps to 200 amps — Service Upgrade
Prepare existing 36 sq ft surface to receive new roof. Apply 1 SPF with Silicone Coating. — ReRoofing; With Electronic Inspection
REPLACE LEAKY GAS LINE FROM METER TO UP AND OVER HOUSE. — New Gas Service
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
0.36 acres
Assessor's classification for assessment purposes. This is not zoning.
4155 PARADISE DR
Source: County of Marin GIS (MarinMap), Parcels · Geography: parcel · Retrieved Nov 13, 2026
Search by parcel number 039-041-26. Assessed value is not market value.
Search by parcel number 039-041-26 (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.
| Zamgen Construction Recent nearby: 3880 Paradise Dr (Jun 11, 2015) | New garage / accessory structure | 4 in ½ mi | $2,345,000 | 0 vs 0 prior |
| Owner Recent nearby: 4071 Paradise Dr (May 9, 2019) | New garage / accessory structure | 4 in ½ mi | $1,075,500 | 25 vs 15 prior+67% |
| Johnstone Mcauliffe Construction Recent nearby: 3900 Paradise Dr (May 20, 2025) | Demolition | 2 in ½ mi | $3,015,000 | 0 vs 0 prior |
| Owner Builder Recent nearby: 4060 Paradise Dr (Jul 9, 2024) | Addition (adds square footage) | 2 in ½ mi | $353,000 | 226 vs 240 prior−6% |
| Dolan Construction And Remodeling Recent nearby: 4134 Paradise Dr (Aka 4130) (Sep 7, 2022) | Addition (adds square footage) | 2 in ½ mi | $170,000 | 0 vs 0 prior |
| Construction Art Recent nearby: 3870 Paradise Dr (Mar 5, 2024) | New single-family home | 1 in ½ mi | $2,100,000 | 0 vs 0 prior |
| Yzw Construction Recent nearby: 3860 Paradise Dr Aka 3860a (Oct 14, 2025) | Accessory dwelling unit (new or conversion) | 1 in ½ mi | $1,400,000 | 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) |
| 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.