Sienna Garden Apartments for rent in Glendale, AZ on ForRent.com: (888) 643-2141 - Availability, pricing and special promotions subject to change daily. Sienna Garden is located in the heart of Glendale, Arizona and close to the Westgate City Center with plenty of shopping, dining and entertainment. Sienna Garden is also close to major freeways, west Phoenix, downtown Glendale, the airport and everything the West Valley has to offer. Sienna Garden in Glendale, Arizona is a quiet community with a swimming pool, spacious private patios, covered parking, walk-in closets and onsite laundry facilities.