Content of application. Applications must be accompanied by plans showing elevations of all proposed new buildings and structures and, in the case of additions or alterations to existing buildings or structures, all affected elevations. If additional information is required by the Design Review Board to complete an adequate review, the following information may be requested: a site plan showing elevation of street, height of proposed building or structure, elevation at grade, and a proposed landscape plan. The submission of an application for review is complete when all required documents have been filed with the Design Review Board. If submission is not completed within 60 days of the filing of an application or the request by the Design Review Board for additional documents, the application shall be deemed to have been withdrawn.