An upper tri-level penthouse atop OKO Group and Cain International’s Una Residences in Miami has sold for $17.75 million, a record sales price for the City’s Brickell submarket. The 7,084-square-foot residence, sold at $2,506 per square foot, also stands as the highest price per square foot deal in the City of Miami. Una's upper penthouse residence was purchased by a domestic buyer seeking a secondary home in Miami.