NEW YORK CITY — GFI Realty Services has arranged the $26.7 million sale of a two-building apartment portfolio in the Prospect Park section of Brooklyn. Located at 111 Woodruff Ave. and 11 Crooke Ave., the properties include 89 residential units, 20 percent of which are vacant. The portfolio includes a unit mix of studio, one-,two- and three-bedroom apartments. The buildings are within two blocks of each other. Erik Yankelovich of GFI represented both the buyer, Greenroad Capital, and the undisclosed seller in the transaction.