At Waldorf Astoria® Hotels & Resorts, Conrad® Hotels & Resorts, Hilton Hotels & Resorts, and DoubleTree by Hilton™ properties, Diamond HHonors guests will receive upgrades to preferred rooms, based on availability at the time of check-in (excludes Napua Tower at Grand Wailea and Imperial Floor at Rome Cavalieri). Upgrades for Diamond HHonors guests may include the next-best available room from the room type booked. Upgrades may also be rooms with desirable views, corner rooms, rooms on high floors, rooms with special amenities, rooms on Executive Floors, or suites, as identified by each property. Upgrades exclude executive suites, villas and specialty accommodations (which may include, but not limited to, "Vista" and "Villa" accommodation types), subject to the discretion of the hotel. Group reservations and certain rates are not eligible for suite accommodations and may not be eligible for complimentary upgrades. All upgrades are granted on a space-available basis for the entire stay, as determined at the time of check-in. Preferred rooms are identified by each individual property and may vary within each brand. Upgrades will be given only for one room for the member, regardless of additional rooms the member may have purchased at or after the time of booking. The following brands do not offer complimentary upgrades: Embassy Suites™, Hilton Garden Inn®, Hampton Inn & Suites®, Homewood Suites by Hilton®, Home2 Suites by Hilton®, and Hilton Grand Vacations®.