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A technology executive is in contract to buy the penthouse at L’Atelier in Miami Beach for $21 million.

Steve Hafner, chief executive of Kayak Software Group, which operates travel website Kayak, said he bought the unit, which is on the northern end of Miami Beach, both because he wanted more space for his growing family and as a financial move. “North Beach/Surfside is an up-and-coming area, and I think the penthouse is a good investment,” Mr. Hafner, 49, said.