Group 1 Automotive, an automotive retailer, agreed to acquire Prime Automotive Group, a car dealership owner, from Highline Management, a property management company in Denver. Financial terms were not disclosed. "Group 1 has successfully operated in the Northeastern US for many years. We are pleased to have this opportunity to leverage our existing cost structure and to further diversify our US footprint," Earl J. Hesterberg, Group 1 President and CEO.