2431 21st Ave

Parcel & Assessor

Lot size:

4,899 sq ft (0.11 ac)

Assessor use:

Double or duplex type - two units

Tax rate area:

17

Addresses on lot:

2431 21ST AVE

State Housing Pathways Screen (ADU & SB 9)

• ADU or junior ADULikely eligible

  Zoned RM-1 (multifamily residential): state law allows ADUs where homes are allowed. We read RM-1 from the zoning code's name; we haven't checked it against Oakland's code text. On a multifamily lot the state allowance is different: ADUs in non-living space of the building, plus up to eight detached ADUs.

• SB 9: two homes on the lotUnlikely

  Zoned RM-1 (multifamily residential), not a single-family residential zone. We read RM-1 from the zoning code's name; we haven't checked it against Oakland's code text.

• SB 9: split into two lotsUnlikely

  Zoned RM-1 (multifamily residential), not a single-family residential zone. We read RM-1 from the zoning code's name; we haven't checked it against Oakland's code text.

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 06001C0086J, effective May 26, 2026

CGS Alquist-Priolo Earthquake Fault Zone

Not in an Alquist-Priolo Earthquake Fault Zone

Surrounding Rent & Value Benchmarks (Public Records)

Nearby Activity (½ mile radius, since —)

17 active or recent development projects (19 housing units across completed, permitted, and pipeline stages) and 0 total building permits recorded within ½ mile.