The penthouse at 224 Mulberry Street has sold for $21 million, Curbed reports. Stephen Zide, a senior advisor at Bain Capital, is the new owner of the 5,646-square-foot four-bedroom duplex, which is one of six units throughout the condo’s eight floors. CORE handled sales and marketing for the building—the penthouse was the priciest sale of the week, but it sold for nearly $3 million under the $23.75 listing price.