BRUNSWICK, N.Y. — Rensselaer County opened a third county highway garage recently at the former home of the Rifenburg companies, located on State Route 278 on an 18-acre parcel. The county erected the new garage that is similar to new garages built in Berlin and Hoosick. The Berlin garage was opened in December of last year and Hoosick opened in March. The Rifenburg companies moved operations to the Rensselaer Technology Park in North Greenbush …