Welcome to Coleman Buick GMC Cadillac, a third generation family owned and operated dealership serving Central New Jersey and surrounding areas for over 60 years. The foundation of our dealership was built on a core set of values that third generation owner, Drew Coleman, strives to uphold. Buick Lease Specials, GMC Lease Specials, Cadillac Lease Specials, Princeton New Jersey, Lawrenceville NJ.