San Francisco · Chinatown · Block/lot 0129/019 · San Francisco
Zoned RM-2 in San Francisco with likely ministerial ADU eligibility and zero mapped flood, fire, or fault hazard overlaps; benchmark value $1,876,000 ($1,595,000–$2,157,000).
Zone RM-2 allows residential use qualifying for ministerial ADU review under state law (14 ADU permits permitted within ¼ mile in 36 months).
Source: San Francisco zoning · CA Gov. Code 66314
Public building records show issued construction/renovation work on this parcel (12 total permits, latest May 22, 2026).
Source: San Francisco Department of Building Inspection, Building Permits (parcel APN)
284 substantial renovation & housing permits over 24 months (283.7 per 1,000 parcels vs. 91.4 citywide baseline) (#12 of 37 neighborhoods).
Source: San Francisco Department of Building Inspection, Building Permits (Chinatown)
Automated synthesis of indexed municipal, county, state, and federal public records — informational context only, not a formal appraisal, survey, or legal/tax determination.
$1,876,000
Benchmark range: $1,595,000 – $2,157,000
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)
Accessory dwelling unit at 1632 Mason St: Active in "Issued" for 5.6 yr (first record Apr 19, 2021) with no new permit activity recorded in 4.4 yr.
Source: San Francisco Department of Building Inspection, Building Permits (review-time benchmark)
Closest lead: 425 Broadway (Mod) (0.41 mi E, entitled). Inspect timeline history before assuming near-term completion.
Source: San Francisco Department of Building Inspection, Building Permits · HCD APR (½-mile radius)
Sale triggers reassessment to 1.00% base + ~0.18% voter debt (~$1,882/mo). Confirm exact Mello-Roos / CFD special assessments on the county tax bill.
Source: CA Const. Art. XIIIA (Prop 13) · County Tax Collector
Since November 2024 within ½ mile: 27 homes completed, 370 permitted, 105 proposed or in review (174 of them deed-restricted affordable); 4 demolitions.
52 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.
1,984 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: San Francisco Department of Building Inspection, Building Permits · 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.
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 San Francisco's planning department before relying on it.
Sources: San Francisco Planning, Zoning Map – Zoning Districts (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 RM-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 5.6 yr (first record Apr 9, 2021), with no completion or new permit record in 4.5 yr. · 2 units · $275,000 declared valuation
Permit issued and active for 5.6 yr (first record Apr 19, 2021), with no completion or new permit record in 4.4 yr. · 1 unit · $195,000 declared valuation
In "Entitled" for 2.3 yr (since Aug 8, 2024), with no new permit record in 2.3 yr. · 1 unit
Permit issued and active for 10.3 yr (first record Jul 15, 2016), with no completion or new permit record in 2.2 yr. · 1 unit · $230,574 declared valuation
Permit issued and active for 8.9 yr (first record Dec 8, 2017), with no completion or new permit record in 2.2 yr. · 2 units · $2,100,000 declared valuation
Permit issued and active for 2.8 yr (first record Feb 5, 2024), with no completion or new permit record in 2.1 yr. · $2,250,000 declared valuation
Nearby remodel / interior alteration (1310 Jones St): Status changed from issued to complete
Record 202609097864 · Detected between snapshots
Source: San Francisco Department of Building Inspection, Building Permits · Snapshot diff within ½ mile
Nearby remodel / interior alteration (27 Morrell Pl): First appeared in published agency feed
Record 202611130737 · Detected between snapshots
Source: San Francisco Department of Building Inspection, Building Permits · Snapshot diff within ½ mile
Nearby windows / doors / siding (1077 Filbert St): First appeared in published agency feed
Record 202611130756 · Detected between snapshots
Source: San Francisco Department of Building Inspection, Building Permits · Snapshot diff within ½ mile
Nearby plumbing / water heater / sewer (1142 Jackson St): First appeared in published agency feed
Record 202611130769 · Detected between snapshots
Source: San Francisco Department of Building Inspection, Building Permits · Snapshot diff within ½ mile
Nearby remodel / interior alteration (1935 Taylor St): First appeared in published agency feed
Record 202611130770 · Detected between snapshots
Source: San Francisco Department of Building Inspection, Building Permits · Snapshot diff within ½ mile
Nearby windows / doors / siding (2355 Leavenworth St): First appeared in published agency feed
Record 202611130779 · Detected between snapshots
Source: San Francisco Department of Building Inspection, Building Permits · Snapshot diff within ½ mile
Nearby commercial tenant improvement (1000 Columbus Av): Status changed from issued to complete
Record 202505287427 · Detected between snapshots
Source: San Francisco Department of Building Inspection, Building Permits · Snapshot diff within ½ mile
Nearby remodel / interior alteration (1160 Grant Av): Status changed from filed to issued
Record 202610018868 · Detected between snapshots
Source: San Francisco Department of Building Inspection, Building Permits · Snapshot diff within ½ mile
Nearby remodel / interior alteration (1160 Grant Av): Issued date changed from (blank) to 2026-11-12
Record 202610018868 · Detected between snapshots
Source: San Francisco Department of Building Inspection, Building Permits · Snapshot diff within ½ mile
Nearby remodel / interior alteration (1160 Grant Av): Declared valuation changed from 0 to 135240
Record 202610018868 · Detected between snapshots
Source: San Francisco Department of Building Inspection, Building Permits · Snapshot diff within ½ mile
Nearby commercial tenant improvement (1045 Sansome St): Declared valuation changed from 0 to 3750000
Record 202610159519 · Detected between snapshots
Source: San Francisco Department of Building Inspection, Building Permits · Snapshot diff within ½ mile
Nearby commercial tenant improvement (1045 Sansome St): Description text was updated
Record 202610159519 · Detected between snapshots
Source: San Francisco Department of Building Inspection, Building Permits · Snapshot diff within ½ mile
Nearby addition (adds square footage) (451 Lombard St): Status changed from filed to issued
Record 202610300137 · Detected between snapshots
Source: San Francisco Department of Building Inspection, Building Permits · Snapshot diff within ½ mile
Nearby addition (adds square footage) (451 Lombard St): Issued date changed from (blank) to 2026-11-12
Record 202610300137 · Detected between snapshots
Source: San Francisco Department of Building Inspection, Building Permits · Snapshot diff within ½ mile
Nearby plan revision / deferred submittal (1942 Leavenworth St): Status changed from filed to issued
Record 202611050421 · Detected between snapshots
Source: San Francisco Department of Building Inspection, Building Permits · Snapshot diff 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 San Francisco development graph →Active in "Issued" for 5.6 yr (first record Apr 19, 2021) with no new permit activity recorded in 4.4 yr.
Active in "Issued" for 5.6 yr (first record Apr 9, 2021) with no new permit activity recorded in 4.5 yr.
Active in "Entitled" for 16 mo (first record Jul 10, 2025) with no new permit activity recorded in 16 mo. High-impact scale (75 housing units across 0 permits).
Active in "Entitled" for 2.1 yr (first record Sep 26, 2024) with no new permit activity recorded in 2.1 yr. High-impact scale (28 housing units, 5 deed-restricted affordable across 0 permits).
Active in "Issued" for 5 yr (first record Dec 1, 2021) with no new permit activity recorded in 12 mo. High-impact scale (2 housing units, $1,316,193 declared valuation across 1 permit).
Active in "Issued" for 7.3 yr (first record Jul 15, 2019) with no new permit activity recorded in 17 mo. High-impact scale (4 housing units, $180,000 declared valuation across 1 permit).
Substantial improvements (additions, interior remodels, ADUs, commercial TI, and new builds) across 1,001 parcels
+16.8% YoY
City baseline: 91.4 / 1k
284 in trailing 24m
Includes 0 ADUs
| Permit category | Sample (n) | 25th pct | Median (50th) | 75th pct | 90th pct | Recent 24m median |
|---|---|---|---|---|---|---|
| New single-family home | 64 | 524d | 934d | 1750d | 2097d | 1502d(vs 794d prior) |
| New duplex / half-plex | 37 | 411d | 791d | 1211d | 1651d | 941d(vs 773d prior) |
| New multifamily / condos / mixed-use | 95 | 373d | 637d | 1061d | 1391d | 418d(vs 637d prior) |
| Accessory dwelling unit (new or conversion) |
HUD Metro Fair Market Rent · San Francisco, CA HUD Metro FMR Area
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 ($18,750/yr) + local voter-approved bond debt ($3,375/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.
−$104,890/yr
Cash needed: $412,500
NOI: $8,882/yr
P&I: $9,481/mo
For $0/mo net cash flow
At $3,600/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 | $3,312/mo | −$9,155/mo | -26.6% | $16,091/mo | −$9,178/mo |
| Base (your inputs) | Your entered assumptions, 3.0%/yr rent growth | $3,600/mo | −$8,741/mo | -25.4% | $14,893/mo | −$8,560/mo |
| Optimistic (cap-limited) | +6% starting rent, 3% vacancy, 4.2%/yr rent growth (capped by local ordinance ceiling of 4.2%/yr) | $3,816/mo | −$8,503/mo | -24.7% | $14,547/mo | −$8,132/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. In San Francisco: San Francisco Rent Ordinance (Admin. Code Ch. 37) — annual allowable increase is 60% of Bay Area CPI (capped at 7%) for covered pre-June 1979 buildings. Official program rules ↗
Issued1 unitsApr 19, 2021 – Jul 1, 2022
Issued2 unitsApr 9, 2021 – Jun 1, 2022
We group related permits and State housing reports into projects. That grouping is our inference, not an official record.
reroof hot works.
addition of (1) adu in existing basement.
addition of (2) adu's in existing basement.
street space
street space only
street space only
mandatory soft story retrofit per 2016 sfebc appendix a-4. n/a for maher
mandatory soft story retrofit per 2016 sfebc appendix a-4. n/a for maher
street space
street space
soft story retrofit per sfbc chapter 34b: 2012 iebc appendix a-4. install shear wall. n/a for maher
soft story retrofit per sfbc chapter 34b: 2012 iebc appendix a-4. install shear walls. n/a for maher
Source: San Francisco Department of Building Inspection, Building Permits · Geography: parcel (APN) · Retrieved Nov 14, 2026 · Filed, issued, and status dates come from the Department of Building Inspection, which dates each status change.
| Report year | Project / record | Type | Entitled | Permitted | Completed | Deed-restricted |
|---|---|---|---|---|---|---|
| 2022 | —(202104098281) | ADU · Renter | — | 2 (Jun 1, 2022) | — | — |
| 2022 | —(202104198852) | ADU · Renter | — | 1 (Jul 1, 2022) | — | — |
Source: California HCD, Housing Element Annual Progress Report — Table A2 · Geography: project (parcel) · Retrieved Nov 9, 2026 · From San Francisco's Housing Element Annual Progress Reports. A project can appear in several report years as it moves from entitlement to permit to completion.
Source: San Francisco Planning, Zoning Map – Zoning Districts · Geography: zoning district polygon at parcel point · Retrieved Nov 14, 2026
1618 MASON ST; 1632 MASON ST
Source: San Francisco Planning / DataSF, Parcels – Active and Retired · Geography: parcel · Retrieved Nov 14, 2026
Zoning, permits, planning cases, and assessor data for this lot (SF Planning)
Look up block/lot 0129/019. Assessed value is not market value.
Search by block/lot 0129/019 (SF Treasurer & Tax Collector)
Search building permits, complaints, and inspections by address or block/lot
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.
| 1,301 |
| 45d |
| 306d |
| 699d |
| 1192d |
| 180d(vs 396d prior) |
| Addition (adds square footage) | 2,099 | 9d | 97d | 408d | 826d | 84d(vs 151d prior) |
| Remodel / interior alterationOn this parcel | 31,105 | 0d | 1d | 21d | 108d | 0d |
| Commercial tenant improvement | 1,831 | 1d | 21d | 62d | 138d | 23d(vs 21d prior) |
| Roof replacementOn this parcel | 18,355 | 0d | 0d | 0d | 3d | 0d |
Source: San Francisco Department of Building Inspection, Building Permits · Computed from issued permits with recorded application and issuance dates over the trailing 60 months. Categories with fewer than 20 permits are excluded.