25905 Bryn Mawr Ave
Hayward 94542 · Hayward · Coordinates: 37.65218, -122.06589
Executive Verdict · Public-Records Synthesis
Zoned RL in Hayward with likely ADU & SB 9 infill eligibility and zero mapped flood, fire, or fault hazard overlaps; benchmark value $1,195,000 ($1,016,000–$1,374,000).
Upsides & Opportunities
- ✓ ADU & SB 9 infill pathways screen as likely eligible
Zoned RL supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 4,982 sq ft lot.
Source: Hayward zoning · CA Gov. Code 66314 & 65852.21
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: Bunker Hill (PG5) (0.21 mi NE, entitled). Inspect timeline history before assuming near-term completion.
Source: Alameda County building permits · HCD APR (½-mile radius)
- ! Bulk building permits not published for Hayward
Permit counts and nearby activity on this page may omit municipal counter records. Request a parcel permit report directly from the local building department.
Source: Source coverage registry (Hayward)
- ! Year 1 Prop 13 tax reset (~$15,029/yr at $1,195,000)
Sale triggers reassessment to 1.00% base + ~0.22% voter debt (~$1,252/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:
- 4,982 sq ft (0.11 ac)
- Assessor use:
- Single family residential homes used as such
- Tax rate area:
- 25
- Addresses on lot:
- 25905 BRYN MAWR AVE
Zoning & Land Use
RL — Low Density Residential - Min. Lot Size - 5,000 Sq Ft (Hayward)
RL — Low Density Residential - Min. Lot Size - 5,000 Sq Ft (Hayward)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned RL (single-family residential): state law allows ADUs where homes are allowed. We read RL from the zoning code's name; we haven't checked it against Hayward's code text. The parcel point also falls in RL.
- SB 9: two homes on the lotLikely eligible
Zoned RL, a single-family residential zone. We read RL from the zoning code's name; we haven't checked it against Hayward's code text. The parcel point also falls in RL.
- SB 9: split into two lotsLikely eligible
Zoned RL, a single-family residential zone. We read RL from the zoning code's name; we haven't checked it against Hayward's code text. The parcel point also falls in RL. The lot is 4,982 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 06001C0289G, effective August 3, 2009
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
Range: $1,016,000 – $1,374,000 · Status: Off market
HUD Small Area FMR (ZIP 94542) · FY 2026
Studio $2,320 · 1BR $2,580 · 2BR $3,150 · 3BR $4,030 · 4BR $4,770
Nearby Activity (½ mile radius, since —)
5 active or recent development projects (5 housing units across completed, permitted, and pipeline stages) and 0 total building permits recorded within ½ mile.
Developments Deserving Closer Investigation & Active Area Builders
- Bunker Hill (PG5) (Entitled)0.21 mi NE
Active in "Entitled" for 4.6 yr (first record Apr 19, 2022) with no new permit activity recorded in 4.6 yr. High-impact scale (90 housing units, 18 deed-restricted affordable across 0 permits).
- Tract 8345-Bld 13-New SFA Unit 58 Plan 2,4 Bd/3.5ba (Issued)0.34 mi NW
Active in "Issued" for 5 yr (first record Nov 9, 2021) with no new permit activity recorded in 5 yr. High-impact scale (1 housing unit, 1 deed-restricted affordable across 0 permits).
- New home (Issued)0.15 mi N
Active in "Issued" for 2.5 yr (first record May 28, 2024) with no new permit activity recorded in 2.5 yr.
- New home (Issued)0.26 mi N
Active in "Issued" for 14 mo (first record Sep 15, 2025) with no new permit activity recorded in 14 mo.
Permit & Project History on This Parcel (0 permits, 1 grouped projects)
No building permits recorded on this parcel in our dataset.
State HCD Housing Element APR records on this parcel: 2 entries (report years 2022, 2025).