Doubletreeâ Hotels proudly announces the opening of the Doubletree Hotel Claremont, representing the latest full-service addition to join the brand's portfolio of more than 160 fine properties across North America. Nestled at the base of the scenic San Gabriel Mountains and centrally located between Southern California's dynamic Inland Empire and the Greater Los Angeles area on Historic Route 66, the finishing touches are being completed on an 18-month, $10 million renovation project to rejuvenate the 190-room hotel and its 12,500 square feet of event space, with new dining and fitness facilities, a day spa and much more.