The date when the lot was acquired by the applicant and from whom acquired. Each application for a building permit shall be accompanied by duplicate copies of plans and specifications, including a plot plan drawn to scale, showing the location and size of all proposed new construction and all existing structures on the site, the nature and character of the work to be performed and the materials to be incorporated, distance from lot lines, the relationship of structures on adjoining property, widths and grades of adjoining streets, walks and rights-of-way, and, where required by the Building Inspector, details of structural, mechanical and electrical work, including computations, stress diagrams and other essential technical data, and such other information as may be necessary to provide for the enforcement of the regulations contained in this chapter and all other laws, ordinances and regulations applicable thereto. Amendments to the application or to the plans or specifications accompanying the same may be filed at any time prior to the completion of the work, subject to the approval of the Building Inspector.