HIGHLAND PARK, N.J. — Ken Uranowitz and Joseph Brecher of Gebroe-Hammer Associates have completed the $8.4 million sale of Parktowne House, an 84-unit apartment complex in Highland Park. The two-building, mid-rise facility is located at 11-19 Raritan Ave. on Route 27. The five- and six-story buildings contain 51 one-bedroom units, 12 two-bedroom units and 21 studio apartments. The facility was fully occupied at the time of the sale. Gebroe-Hammer represented the undisclosed seller and procured the buyer, an undisclosed Manhattan-based real estate investor.