Where is the company that used  Leavitt Farm as headquarters and museum facility located 
Leavitt Farm:  The property was in the 1980s used by the Concord Coach Society (now the Abbot-Downing Historical Society) as a headquarters and museum facility. Abbot-Downing Company: Abbot-Downing Company was a coach and carriage builder in Concord, New Hampshire, which became known throughout the United States for its products — in particular the first Concord coach.
Concord, New Hampshire