3700 21st Ave
Sacramento 95820 · South Oak Park · City of Sacramento · Coordinates: 38.53337, -121.46706
Executive Verdict · Public-Records Synthesis
Zoned R-1 in City of Sacramento with likely ADU & SB 9 infill eligibility and zero mapped flood, fire, or fault hazard overlaps; benchmark value $370,000 ($326,000–$414,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned R-1 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 5,227 sq ft lot. Local precedent is active with 12 ADU permits within ¼ mile over the last 36 months.
Source: City of Sacramento zoning · CA Gov. Code 66314 & 65852.21
- ✓ 3 documented municipal building permits on file
On-parcel permit history is indexed through Dec 29, 2025, letting you verify roof, HVAC, electrical, or structural work against seller disclosures.
Source: City of Sacramento CDD, Issued Building Permits (Current Year) (parcel APN)
Watchouts & Due Diligence
- ! Mapped flood awareness zone (Zone X: minimal flood hazard)
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)
- ! 6 slow or stalled nearby projects within ½ mile
Closest lead: Accessory dwelling unit at 3320 20th Ave (0.23 mi W, issued). Inspect timeline history before assuming near-term completion.
Source: City of Sacramento CDD, Issued Building Permits (Current Year) · HCD APR (½-mile radius)
- ! Year 1 Prop 13 tax reset (~$4,668/yr at $370,000)
Sale triggers reassessment to 1.00% base + ~0.14% voter debt (~$389/mo). Confirm exact Mello-Roos / CFD special assessments on the county tax bill.
Source: CA Const. Art. XIIIA (Prop 13) · County Tax Collector
Parcel & Assessor
- Lot size:
- 5,227 sq ft (0.12 ac)
- Assessor use:
- Residential · Single Family · Subdivision
- Tax rate area:
- 03019
- Addresses on lot:
- 3700 21ST AVE
Zoning & Land Use
R-1 — Single-Unit Dwelling Zone (R)
2040 General Plan: Neighborhood (FAR up to 1)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R-1 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R-1, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R-1, a single-family residential zone. The lot is 5,227 sq ft by the assessor, room for two lots of at least 1,200 sq ft, each at least 40% of the original.
Mapped Hazard Zones on This Lot
- CAL FIRE Fire Hazard Severity Zone
- Not in a State-mapped fire hazard severity zone
- FEMA National Flood Hazard Layer
- Zone X: minimal flood hazard (all of the lot) · FIRM panel 06067C0190H, effective August 16, 2012
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
Range: $326,000 – $414,000 · Status: Off market
HUD Small Area FMR (ZIP 95820) · FY 2026
Studio $1,530 · 1BR $1,610 · 2BR $1,980 · 3BR $2,640 · 4BR $3,040
Nearby Activity (½ mile radius, since November 2024)
43 active or recent development projects (47 housing units across completed, permitted, and pipeline stages) and 403 total building permits recorded within ½ mile.
- New construction17 permits (19 units)
- Adds housing (ADU)32 permits (38 units)
- Demolition5 permits
- Additions & renovations29 permits
- Building systems290 permits
- Repairs8 permits
- Other22 permits
Developments Deserving Closer Investigation & Active Area Builders
- Accessory dwelling unit at 3320 20th Ave (Issued)0.23 mi W
Active in "Issued" for 21 mo (first record Feb 18, 2025) with no new permit activity recorded in 14 mo. current_status changed to "Finaled" in snapshot Nov 1, 2026.
- New duplex at 3821 35th St (In review)0.47 mi N
In "In review" for 15 mo (since Aug 20, 2025), exceeding the 184d median and 416d 75th percentile for new duplex / half-plex permits in City of Sacramento (n=115). current_status changed to "Verify" in snapshot Nov 1, 2026.
- SB 9 Lot Split & Duplex at 3727 17th Ave (Entitled)0.25 mi N
In "Entitled" for 2.9 yr (since Jan 5, 2024), exceeding the 45d median and 184d 90th percentile for new single-family home permits in City of Sacramento (n=3,657).
- Accessory dwelling unit at 4205 32nd St (Fee estimate)0.37 mi NW
In "Fee estimate" for 7 mo (since Apr 1, 2026), exceeding the 45d median and 184d 90th percentile for new single-family home permits in City of Sacramento (n=3,657).
Entity-resolved builders & contractors in ½ mile: Buds Plumbing And Heating (1 on parcel, 1 in ½ mi · Plumbing / water heater / sewer); Ces Integrated (1 on parcel, 1 in ½ mi · HVAC / heat pump); D And S Construction (4 in ½ mi · New single-family home); Gw Demolition (4 in ½ mi · Demolition); Rpm Development And Engineering (3 in ½ mi · Accessory dwelling unit (new or conversion)).
Permit & Project History on This Parcel (3 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| RES-2527429 | HVAC / heat pump | Finaled | Iss. Dec 29, 2025 | $3,400 | No Duct Work Permitted. Change-out Wall Furnace to Wall Furnace. The existing unit shall be removed. The new unit shall … |
| RES-2522391 | Plumbing / water heater / sewer | Finaled | Iss. Oct 24, 2025 | $17,000 | E-Permit: Water Service replacement or repair, 101 L.F. Water Re-pipe, 101 L.F. |
| RES-2003260 | Plumbing / water heater / sewer | Expired Permit | Iss. Feb 25, 2020 | $1,500 | AA: Sewer Service replacement or repair, Dig and Bury 10 L.F. |