PERTH AMBOY, N.J. — Gebroe-Hammer Associates has negotiated the sale of Spring Cove Apartments, a 38-unit, age-restricted community for people age 55 and older in Perth Amboy. The asset traded for $5.6 million. Gebroe-Hammer represented the seller, 675 New Brunswick Avenue LLC, in the transaction. The buyer was a private investor. Located at 75 New Brunswick Ave., the four-story gated property features a lounge and activity area, in-unit washers and dryers, oversized windows, eat-in-kitchens and ceramic-tile floors.