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Sublease Highlights

  • Close proximity to Ontario International Airport and major business services.
  • Ample parking with a ratio of 4 spaces per 1,000 SF.
  • Located minutes from the 10, 57, 71, and 60 Freeways for superior regional access.
  • Professional setting with landscaped grounds and a secure environment.

All Available Space(1)

Display Rental Rate as

  • Space
  • Size
  • Term
  • Rental Rate
  • Space Use
  • Build-Out
  • Available
  • 2nd Floor, Ste 270
  • 2,916 SF
  • Oct 2028
  • $47.10 CAD/SF/YR $3.92 CAD/SF/MO $137,335 CAD/YR $11,445 CAD/MO
  • Office
  • Full Build-Out
  • Now

High Image Class B building is prime area in the Tri-County location in Diamond Bar. 6 Private offices, 1 large conference room, open floorplan with a kitchenette and plenty of parking.

  • Sublease space available from current tenant
  • Fully Built-Out as Standard Office
  • Fits 8 - 24 People
  • 1 Conference Room
  • Central Air and Heating
  • Atrium
  • Rate includes utilities, building services and property expenses
  • Mostly Open Floor Plan Layout
  • 6 Private Offices
  • Space is in Excellent Condition
  • Print/Copy Room
Space Size Term Rental Rate Space Use Build-Out Available
2nd Floor, Ste 270 2,916 SF Oct 2028 $47.10 CAD/SF/YR $3.92 CAD/SF/MO $137,335 CAD/YR $11,445 CAD/MO Office Full Build-Out Now

2nd Floor, Ste 270

Size
2,916 SF
Term
Oct 2028
Rental Rate
$47.10 CAD/SF/YR $3.92 CAD/SF/MO $137,335 CAD/YR $11,445 CAD/MO
Space Use
Office
Build-Out
Full Build-Out
Available
Now

2nd Floor, Ste 270

Size 2,916 SF
Term Oct 2028
Rental Rate $47.10 CAD/SF/YR
Space Use Office
Build-Out Full Build-Out
Available Now

High Image Class B building is prime area in the Tri-County location in Diamond Bar. 6 Private offices, 1 large conference room, open floorplan with a kitchenette and plenty of parking.

  • Sublease space available from current tenant
  • Rate includes utilities, building services and property expenses
  • Fully Built-Out as Standard Office
  • Mostly Open Floor Plan Layout
  • Fits 8 - 24 People
  • 6 Private Offices
  • 1 Conference Room
  • Space is in Excellent Condition
  • Central Air and Heating
  • Print/Copy Room
  • Atrium

Property Overview

21700 Copley Drive is part of the Gateway Corporate Center, a premier office development located in Diamond Bar, California. This Class B office building spans approximately 80,026 square feet and sits on a 6.89-acre lot within a master-planned business park. Designed for corporate and professional use, the property offers a serene environment with lush landscaping and a dramatic architectural presence. The building features modern office layouts suitable for a variety of business needs, including private offices, collaborative workspaces, and conference rooms. Its strategic location provides excellent connectivity to major Southern California freeways, including the 10, 57, 71, and 60, and is just 20 minutes from Ontario International Airport. Nearby amenities include hotels, restaurants, and retail services, making it an attractive choice for companies seeking convenience and accessibility in the Eastern San Gabriel Valley market.

  • Bus Line
  • Day Care
  • Food Service
  • Energy Star Labeled

Property Facts

Building Type
Office
Year Built
1991
Building Height
3 Stories
Building Size
81,437 SF
Building Class
B
Typical Floor Size
27,146 SF
Unfinished Ceiling Height
12’
Parking
200 Surface Parking Spaces
Covered Parking
Fairly walkable
40/100
Exceptionally drivable
100/100
Limited public transit
30/100
Fairly bikeable
40/100
  • Listing ID: 33564602

  • Date on Market: 2026-01-23

  • Last Updated:

  • Address: 21700 Copley Dr, Diamond Bar, CA 91765

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