PLAINFIELD, N.J. — Gebroe-Hammer Associates has brokered the $15.4 million sale of two apartment buildings in Plainfield. Stephen Tragash and Gehane Triarsi of Gebroe-Hammer represented the undisclosed seller of Cornell Arms and Pingry Arms apartments, which are located a half-mile apart at 735 Park Ave. and 606 Crescent Ave., respectively. The buyer was also undisclosed. Comprised of 114 total units, the six-story mid-rise properties each feature a mix of studio and one-, two- and three-bedroom layouts. Amenities include elevators, laundry facilities and paved-surface parking.