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425 S Ellsworth Ave
San Mateo, CA 94401 Downtown San Mateo

Rate Upon Request

Office For Lease  •  38,612+ SF

Property Details

  • Property Type Office
  • Year Built 2028
  • Total Building Size 168,815 SF
  • Tenancy Multiple
  • Building Class A
50 Transit Score
99 Walk Score

3 Spaces Available

Name Space Use Size Rent Details
2nd Floor Ste Office 50,710 SF Rate Upon Request 
Large Open Floor Plate , ±14 ft slab-to-slab height.

  • Date available: Sep 2026
  • Lease term: Negotiable
  • Service type: Negotiable
  • Space Type: New
  • In Contiguous block: 139,699 SF
3rd Floor Ste Office 50,377 SF Rate Upon Request 
Large Open Floor Plate with Two Terraces Including a +/-4,200 SF Wraparound Terrace Overlooking 4th Ave and B Street
±14 ft slab-to-slab height

  • Date available: Sep 2026
  • Lease term: Negotiable
  • Service type: Negotiable
  • Space Type: New
  • In Contiguous block: 139,699 SF
4th Floor Ste Office 38,612 SF Rate Upon Request 
Large Open Floor Plate with Outdoor Terrace Overlooking the Public Plaza
±14 ft slab-to-slab height

  • Date available: Sep 2026
  • Lease term: Negotiable
  • Service type: Negotiable
  • Space Type: New
  • In Contiguous block: 139,699 SF

Description 

Class A+ Office Buildingin the Heart of Downtown San Mateo. B Street South will utilize CLT (mass timber) construction and represents one of the most sustainable HQ opportunities on the Peninsula.

Q4-22: Entitlements
Q1-24: Start of Construction
Q3-25: Shell Complete
Q4-25: Expected Occupancy

Highlights

Mass Timber CLT construction; sustainable HQ opportunity.

Property Flyers

Amenities

  • Bus Line
  • Commuter Rail
  • Conferencing Facility
  • Convenience Store
  • Food Service
  • Security System
  • Signage
  • Roof Terrace
  • Car Charging Station
  • Bicycle Storage
  • Central Heating
  • Shower Facilities
  • Outdoor Seating
  • Air Conditioning
  • Balcony

Public Transportation

Commuter RailDriveWalkDistance
San Mateo Caltrain Station Northbound (Express - Caltrain (Caltrain), Limited - Caltrain (Caltrain), Local Weekday - Caltrain (Caltrain), Local Weekend - Caltrain (Caltrain)) 1 min 7 min 0.4 mi
Hayward Park Caltrain Station Southbound (Local Weekday - Caltrain (Caltrain), Local Weekend - Caltrain (Caltrain)) 4 min - 1.5 mi
AirportDriveWalkDistance
San Francisco International 11 min - 7.2 mi
Metro Oakland International 34 min - 25.8 mi
Norman Y Mineta San Jose International 35 min - 27.4 mi

Parking Details

Parking Available: Yes
Reserved: No
Spaces Provided: 240
Type: Covered
Included in Rent: Yes
Ben Stern 650-688-8509 Newmark
Ben Stern 650-688-8509 Newmark