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.