SEATTLE—The 43-story office tower being planned here will include a luxury SLS hotel, the boutique brand’s first location in the area.

SBE Entertainment Group LLC, which owns the SLS brand, will run the 184-room hotel on the tower’s second through 15th floors, Chairman and Chief Executive Officer Sam Nazarian, told Bloomberg Business Week.

The Los Angeles-based company also operates Hyde nightclubs and the Katsuya and Cleo restaurant brands.

Construction will start on the $400 million downtown building by Oct. 1 and completion is scheduled for mid-2016, said Kevin Daniels, president of Seattle-based Daniels Real Estate, which is developing the tower with Stockbridge Capital Group of San Francisco. If it reaches the planned height, it will be city’s tallest development in two decades.

The partners and Nazarian are betting on continued growth in Seattle’s office and hospitality markets, which outperformed the rest of the U.S. last year.

“Certain U.S. cities are benefiting greatly from the economic superpower called China — the money that is flowing into homes and businesses here through Chinese nationals is amazing,” Daniels said in a telephone interview. “Add to that the economic and job growth at all the major employers in this area, like Amazon, Nordstrom, Starbucks and Boeing, and you have a city that is firing on all cylinders.”

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