The owners of all lots involved join in a written application, supported by the information and data required by § 84-87A, agree in writing by execution of a developer's agreement, in a form approved by the Board of Supervisors, to be fully bound to develop the combined lots as a single lot in accordance with the zoning, subdivision and land development regulations and, as a part of the application, submit a traffic circulation and parking plan in accordance with the requirements of § 84-55E.