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SPG Factoid-Third Night free stay counts as 3 nights for elite qualification

Starwood Lurker on FlyerTalk posted last month hotel rates where the third night is free are considered revenue nights and count as three elite qualification nights. These are rates like Z3H and Z3R and the SPG American Express Sheraton 3rd night free special card member rate.

This is one of those finer points and deep questions for SPG elite members clarified.