COLLINGSWOOD, N.J. — NAI Mertz has brokered the sale of a mixed-use property located at 814-816 Haddon Ave. in Collingswood. The 6,000-square-foot building sold for an undisclosed sum. The property is occupied by Weinstein Bath & Kitchen Showroom on the ground level. Additionally, the property features three residential units. Jonathan Klear and Scott Mertz of NAI Mertz represented the seller, Dergalcol LLC, in the transaction. The name of the buyer was not released.