667 Sycamore Ave
Hayward 94544 · Hayward · Coordinates: 37.66170, -122.07955
Executive Verdict · Public-Records Synthesis
Zoned RMB4 in Hayward with likely ministerial ADU eligibility and zero mapped flood, fire, or fault hazard overlaps; benchmark value $981,000 ($834,000–$1,128,000).
Upsides & Opportunities
- ✓ Ministerial ADU / JADU pathway likely eligible
Zone RMB4 allows residential use qualifying for ministerial ADU review under state law.
Source: Hayward zoning · CA Gov. Code 66314
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)
- ! Delayed or open permit activity on this parcel
detached ADU w/ 2 bed 1 bath 602 sq ft, upgrade: Active in "Issued" for 5.6 yr (first record Apr 12, 2021) with no new permit activity recorded in 5.6 yr.
Source: Alameda County building permits (review-time benchmark)
- ! 5 slow or stalled nearby projects within ½ mile
Closest lead: 4 new homes (0.11 mi NE, issued). 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)
Parcel & Assessor
- Lot size:
- 6,071 sq ft (0.14 ac)
- Assessor use:
- 2 units, SFR with detached accessory dwelling unit
- Tax rate area:
- 25
- Addresses on lot:
- 667 SYCAMORE AVE; 671 SYCAMORE AVE
Zoning & Land Use
RMB4 — Medium Density Residential (Hayward)
RMB4 — Medium Density Residential (Hayward)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned RMB4 (multifamily residential): state law allows ADUs where homes are allowed. We read RMB4 from the zoning code's name; we haven't checked it against Hayward's code text. The parcel point also falls in RMB4. 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 RMB4 (multifamily residential), not a single-family residential zone. We read RMB4 from the zoning code's name; we haven't checked it against Hayward's code text. The parcel point also falls in RMB4.
- SB 9: split into two lotsUnlikely
Zoned RMB4 (multifamily residential), not a single-family residential zone. We read RMB4 from the zoning code's name; we haven't checked it against Hayward's code text. The parcel point also falls in RMB4.
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 06001C0287G, 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: $834,000 – $1,128,000 · Status: Off market
HUD Small Area FMR (ZIP 94544) · FY 2026
Studio $2,100 · 1BR $2,330 · 2BR $2,850 · 3BR $3,640 · 4BR $4,320
Nearby Activity (½ mile radius, since —)
4 active or recent development projects (7 housing units across completed, permitted, and pipeline stages) and 0 total building permits recorded within ½ mile.
Developments Deserving Closer Investigation & Active Area Builders
- detached ADU w/ 2 bed 1 bath 602 sq ft, upgrade (Issued)On this parcel
Active in "Issued" for 5.6 yr (first record Apr 12, 2021) with no new permit activity recorded in 5.6 yr.
- 4 new homes (Issued)0.11 mi NE
Active in "Issued" for 21 mo (first record Feb 24, 2025) with no new permit activity recorded in 21 mo. High-impact scale (4 housing units across 0 permits).
- Jackson Street Live/Work Units (Entitled)0.26 mi NW
Active in "Entitled" for 6 yr (first record Oct 30, 2020) with no new permit activity recorded in 6 yr. High-impact scale (4 housing units across 0 permits).
- O'Neil Avenue Apartments (Entitled)0.32 mi SE
Active in "Entitled" for 6.3 yr (first record Jul 9, 2020) with no new permit activity recorded in 6.3 yr. High-impact scale (9 housing units, 1 deed-restricted affordable across 0 permits).
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: 1 entry (report years 2021).