TC Triumph owns the 83-room hotel, which is operated by North Mich Hospitality Management.
Hilton's newest brand is designed to shake up what people expect from an upper-midscale hotel.
The six newly designed luxury accommodations are known as the Rockbound Bungalows.
The property now has art walls representing the Seattle cultural scene, and artwork created by local artists.
The 201-room hotel will be designed by Franklin Azzi Architecture and is expected to open by 2020.
The hotel company will invest about $260 million to build 10 hotels in Oman by 2021
Both hotels are new construction and are related in ownership, and consist of a combined 81 new rooms.
The hotel will join the hotel company's Novotel and Ibis lakefront hotels.
Rezidor Group will open more business-oriented hotels to meet the travel demands in sub-Saharan Africa.
Ritz-Carlton aims to make Zanzibar's hotel market a strong competitor of key leisure destinations in the Indian Ocean.