As it approaches a decade in operation, the Westin Book Cadillac Detroit is set to get a multimillion dollar rehab next year.

The three-phase project will include remodeling the historic hotel's 453 rooms, guest floor corridors, restaurants and 39,000 square feet of meeting rooms and public spaces.

Bethesda, Md.-based Marriott International Inc. will manage the renewal project for the 93-year-old building, which is owned by Cleveland-based The Ferchill Group. Ferchill bought the Neo-Renaissance building in 2006, which had been vacant for more than two decades, and invested $200 million to renovate it and open the hotel in 2008.

The 33-story hotel, commissioned by the Book brothers and designed by Louis Kamper in 1924, was once the tallest hotel in the world.

Next month, Seattle-based Starbucks Corp. will open its Starbucks Reserve premium brand at the hotel to kick off the first phase. The project is expected to be completed in early 2019.

The real estate firm has yet to choose an architect and contractor for the project, and did not disclose how much the project would cost.

"Design firms are currently under review and the final selection will be announced later this month," Ferchill Group Vice President of Development Chris Ferchill said in a statement.