Mill Valley 94941 · Strawberry · APN 043-381-02 · Unincorporated Marin
Zoned RMP-4-BFC in Unincorporated Marin with likely ministerial ADU eligibility and zero mapped flood, fire, or fault hazard overlaps; benchmark value $2,294,000 ($2,019,000–$2,569,000).
Zone RMP-4-BFC 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 (6 total permits, latest Sep 1, 2026).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
43 substantial renovation & housing permits over 24 months (28.4 per 1,000 parcels vs. 16.4 citywide baseline) (#1 of 22 neighborhoods).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (Strawberry)
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: 4 permitted, 1 proposed or in review; 1 demolition.
6 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.
97 permits within ½ mile since November 2024
$2,294,000
Benchmark range: $2,019,000 – $2,569,000
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)
Closest lead: New home (0.19 mi NW, entitled). 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 (~$2,236/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 RMP-4-BFC 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 12 yr (first record Nov 5, 2014), with no completion or new permit record in 12 yr. · $10,000 declared valuation
Permit issued and active for 9.6 yr (first record Apr 13, 2017), with no completion or new permit record in 9.5 yr. · $55,000 declared valuation
Permit issued and active for 7.3 yr (first record Jul 17, 2019), with no completion or new permit record in 7.3 yr. · $5,000 declared valuation
Permit issued and active for 6.6 yr (first record Apr 1, 2020), with no completion or new permit record in 6.5 yr. · $6,000 declared valuation
In "Entitled" for 5.1 yr (since Sep 30, 2021), with no new permit record in 5.1 yr. · 1 unit
Permit issued and active for 5.7 yr (first record Mar 9, 2021), with no completion or new permit record in 5 yr. · 1 unit · $30,000 declared valuation
Nearby remodel / interior alteration (144 Mission Dr): Contractor changed from (blank) to BOLT DOWN THE BAY AREA
Record 182696 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby remodel / interior alteration (427 E Strawberry Dr): First appeared in published agency feed
Record 182860 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby remodel / interior alteration (427 E Strawberry Dr): No longer present in latest agency feed
Record 94356 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby windows / doors / siding (145 Great Circle Dr): First appeared in published agency feed
Record B48901 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
427 E Strawberry Dr · 1 unit · $225,000 valuation
Records span Jun 18, 2026 to Oct 20, 2026 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
Latest published Zillow Home Value Index (ZHVI) update
Changed from $1,980,059 in September 2025 to $2,181,389 in September 2026.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94941 (not a parcel appraisal)
Plumbing / water heater / sewer permit application filed (B48168)
Current status: Issued
New Plumbing Fixture(s) · Declared valuation: $850 · Contractor: Big Island Plumbing
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Plumbing / water heater / sewer permit issued (B48168)
Recorded status: Issued
New Plumbing Fixture(s) · Declared valuation: $850 · Contractor: Big Island Plumbing
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Pool / spa permit application filed (94491)
Current status: Applied
(N) Redwood Decking (N) Bbq With Cabinetry And Sink (N) Hot Tub, Sauna, And Cold Plunge. Flatwork Includes Slab For Hot Tub. · Declared valuation: $100,000
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Electrical / panel permit issued (B47981)
Recorded status: Issued
New Circuits / Outlets, Replace Circuits / Outlets · Declared valuation: $14,000 · Contractor: Wilkerson Electric
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Electrical / panel permit application filed (B47981)
Current status: Issued
New Circuits / Outlets, Replace Circuits / Outlets · Declared valuation: $14,000 · Contractor: Wilkerson Electric
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Other permit application filed (B47950)
Current status: Issued
New Gas Service · Declared valuation: $1,500 · Contractor: Big Island Plumbing
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Other permit issued (B47950)
Recorded status: Issued
New Gas Service · Declared valuation: $1,500 · Contractor: Big Island Plumbing
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Demolition permit application filed (182215)
Current status: Issued
Demo Pool · Declared valuation: $16,000 · Contractor: Smi Demolition
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Demolition permit issued (182215)
Recorded status: Issued
Demo Pool · Declared valuation: $16,000 · Contractor: Smi Demolition
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 →In "Entitled" for 5.1 yr (since Sep 30, 2021), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
In "Applied" for 15 mo (since Aug 14, 2025), exceeding the 55d median and 261d 90th percentile for demolition permits in Unincorporated Marin (n=130).
Active in "Issued" for 9.6 yr (first record Apr 13, 2017) with no new permit activity recorded in 9.5 yr.
Active in "Issued" for 6.6 yr (first record Apr 1, 2020) with no new permit activity recorded in 6.5 yr.
Active in "Issued" for 3.9 yr (first record Dec 9, 2022) with no new permit activity recorded in 13 mo.
Active in "Issued" for 5.7 yr (first record Mar 9, 2021) with no new permit activity recorded in 5 yr.
Substantial improvements (additions, interior remodels, ADUs, commercial TI, and new builds) across 1,512 parcels
+52.9% YoY
City baseline: 16.4 / 1k
43 in trailing 24m
Includes 8 ADUs
| Builder / contractor | Primary specialty | Here / ½ mi | ½ mi valuation | Citywide 24m trend |
|---|---|---|---|---|
| Owner Builder | Remodel / interior alteration | 1 on parcel19 in ½ mi | $3,908,900 | 226 vs 240 prior−6% |
| Big Island Plumbing | Other | 2 on parcel2 in ½ mi | $2,350 | 0 vs 0 prior |
| Smi Demolition | Demolition | 1 on parcel1 in ½ mi | $16,000 |
| 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) |
| Demolition |
HUD Small Area Fair Market Rent · ZIP 94941
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 ($22,950/yr) + local voter-approved bond debt ($3,443/yr) + fixed direct levies/Mello-Roos ($450/yr).
Insurance & hazard context:
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.
−$131,392/yr
Cash needed: $504,900
NOI: $7,865/yr
P&I: $11,605/mo
For $0/mo net cash flow
At $3,950/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 | $3,634/mo | −$11,403/mo | -27.1% | $19,551/mo | −$11,442/mo |
| Base (your inputs) | Your entered assumptions, 3.0%/yr rent growth | $3,950/mo | −$10,949/mo | -26.0% | $18,096/mo | −$10,764/mo |
| Optimistic (cap-limited) | +6% starting rent, 3% vacancy, 4.5%/yr rent growth (capped by AB 1482 ceiling of 8.6%/yr) | $4,187/mo | −$10,689/mo | -25.4% | $17,676/mo | −$10,249/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 Plumbing Fixture(s)
(N) Redwood Decking (N) Bbq With Cabinetry And Sink (N) Hot Tub, Sauna, And Cold Plunge. Flatwork Includes Slab For Hot Tub.
New Circuits / Outlets, Replace Circuits / Outlets
New Gas Service
Demo Pool
Remodel: (3) Baths & Powder Rm
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
0.30 acres
Assessor's classification for assessment purposes. This is not zoning.
13 HERON DR
Source: County of Marin GIS (MarinMap), Parcels · Geography: parcel · Retrieved Nov 13, 2026
Search by parcel number 043-381-02. Assessed value is not market value.
Search by parcel number 043-381-02 (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.
| 2 vs 2 prior |
| Wilkerson Electric | Electrical / panel | 1 on parcel1 in ½ mi | $14,000 | 0 vs 0 prior |
| Lek Enterprises Recent nearby: 2 Harbor Point Dr (Mar 6, 2023) | Remodel / interior alteration | 35 in ½ mi | $1,113,400 | 0 vs 11 prior−100% |
| Owner Recent nearby: 58 Great Circle Dr (Aug 7, 2019) | Remodel / interior alteration | 10 in ½ mi | $369,000 | 25 vs 15 prior+67% |
| Kerr Construction Recent nearby: 427 E Strawberry Dr (Nov 2, 2026) | New garage / accessory structure | 6 in ½ mi | $888,600 | 2 vs 2 prior |
| Solarports Development Recent nearby: 475 E Strawberry Dr (Feb 27, 2023) | New garage / accessory structure | 5 in ½ mi | $366,850 | 0 vs 5 prior |
| Norman Charles Construction Recent nearby: 70 Century Dr (Jul 22, 2024) | Remodel / interior alteration | 4 in ½ mi | $545,000 | 0 vs 3 prior |
| G Family Recent nearby: 50 Great Circle Dr (Jun 27, 2025) | Remodel / interior alteration | 3 in ½ mi | $440,325 | 13 vs 8 prior+63% |
| 130 |
| 11d |
| 55d |
| 106d |
| 261d |
| 80d(vs 56d prior) |
| Addition (adds square footage) | 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) |
| Pool / spaOn this parcel | 162 | 84d | 136d | 241d | 393d | 128d(vs 155d prior) |
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.