Rental residents used to be content with a nice pool, free lobby coffee, and even valet trash service. But the wealthy living in today’s ultra-luxe apartments—largely in major cities— want more. Now, some luxury apartment buildings in the U.S. have started offering med-spa services like IV hydration and Botox.

“Property managers are venturing into amenities like health care and aesthetics to meet the evolving demands of luxury renters and stay competitive in an amenities arms race,” John Walkup, co-founder of real estate analytics firm UrbanDigs, tells Fortune. “Luxury implies exclusivity, and developers constantly seek to outdo each other by offering the latest and most unique amenities. Yesterday's pool is today's pet spa—and tomorrow's pool is the Botox [and] rehydration lounge.”

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