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NEW YORK CITY — Marcus & Millichap has negotiated the $4.1 million sale of a multifamily building in the Carroll Gardens neighborhood of Brooklyn. Located at 306 Union St., the 4,620-square-foot property includes four units. Shaun Riney, Michael Salvatico and John Barney of Marcus & Millichap’s Brooklyn office represented the seller, a private investor, in the transaction. The buyer was also a private investor.