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Official Announcement
American Express and Starwood enhance cobrand credit card benefits

Will the additional cardholders on my Starwood Business Amex account get access to the Sheraton Club lounge? What about guests in additional rooms I'm also paying for?
"This benefit is for Basic Card Members only on Starpoint Eligible Rate reservations...Sheraton Club lounge access is limited to the eligible Card Member and a guest staying in the same room for the duration of the stay, regardless of how many rooms have been reserved." (See Starwood FAQs.)

Which hotel brands with the Sheraton name will offer the lounge benefit?The benefit is offered at all Sheraton-branded properties, including Sheraton Grand hotels, with the exception of any Luxury Collection property. It is not available at Four Points by Sheraton hotels.

Club access if I book my stay with points or cash+points?
Per Starwood Lurker, yes.