Massey Knakal Realty Services (MK) has recently completed the following deals: A mixed-use property at 8612 3rd Ave. in the Bay Ridge area was sold in an all-cash transaction valued at $1.275 million. It contains 3,700 s/f and was sold for $350 per s/f to a Brooklyn investor. MK broker Stephen Palmese exclusively represented the seller. The firm has also sold a three-family apartment building at 590 Sterling Pl. in the Prospect Heights area in a transaction valued at $1.095 million. The property sold for $260.71 per s/f to a Manhattan user. MK broker Ira Krivit exclusively represented the seller. Alex Maroni of Heights Berkeley Realty Inc. assisted. MK sold a 2,500 s/f, one-story restaurant building with 3,000 s/f of additional air rights at 218 Richardson St. in the Williamsburg area in an all-cash transaction valued at $875,000. It was delivered vacant and sold for $350 per s/f. MK broker Mark Lively exclusively represented the seller with broker Philip Kean. Ari Freundlich assisted in this transaction. The firm has also been hired to market an entire Fifth Ave. block front in Harlem-1428 Fifth Ave. The property presents an investment and development opportunity along Fifth Ave. and West 116th St. Shimon Shkury, Thomas Donovan and Michael Tortorici of MK are the exclusive agents.