Guests that have reservations for stays at W Las Vegas have received emails from Starwood this week informing that the brand of the hotel is changing to SLS effective July 20, 2018.
Grand Tower at SLS is still part of SPG/Marriott under Tribute Portfolio but unclear for how long. Accor just bought 50% stake in SBE (read more here) that owns SLS brand among others.
You can access SPG’s page for SLS here.
Not sure how long deal this SLS Las Vegas has done with the SBE when it comes to the brand usage. Difficult to see SLS in Las Vegas be part of Marriott Rewards under this Accor/SBE deal.
And I don’t believe that anybody could consider that 289 room hotel is a boutique one even in Las Vegas (looking at the email that the SPG sent out).