456 Main Street, Rockland, Maine Represented by Aaron Crossman Developers take notice! This extremely large, brick building, has over 24,000 sq. feet waiting for your development ideas. Located in the downtown zone, this building has the ability to go up another 2 stories (65′ in height). This is a fantastic opportunity to create something special in the heart of one of Maine’s best cities. Click for More Information on this beautiful Rockland Maine Real Estate Listing. Click for More Rockland Maine Homes For Sale. Click for more information on Living in Rockland Maine.