PALM BEACH GARDENS, FLA. — Nuveen Real Estate has sold Promenade Shopping Plaza, a 207,877-square-foot shopping center located in Palm Beach Gardens. Boston-based Mount Vernon Co. purchased the Publix-anchored center. Danny Finkle, Jorge Portela and Kim Flores of JLL represented Nuveen in the transaction. The sales price was not disclosed, but South Florida Business Journal reports that the shopping center traded for $67 million. Promenade was originally developed in 1989 and renovated in May 20