Unless otherwise stated, the following design standards are mandatory for all new buildings and structures. Each applicant for new land use and development shall comply with the required standards to achieve the goals and specific recommendations as set forth in the Comprehensive Plan and in accordance with the purpose and intent of the regulations as set forth herein. Where the following standards are stated as not mandatory, compliance is strongly encouraged. The term "shall" is interpreted as mandatory. The term "should" or "may" is interpreted as optional. Upon written application setting forth the reasons why a waiver of any provision of this section is necessary or desirable, the Planning Board may entertain such application. If the Planning Board finds that, because of unusual circumstances of shape, topography or other physical features of the proposed site, extraordinary hardship would result from the strict compliance with this section, it may waive certain provisions of this section so that substantial justice may be done and the public interest secured, provided that no such waiver shall be granted which will have the effect of nullifying the intent or purpose of the other articles of this chapter or Chapter 104, Subdivision of Land. In permitting such a waiver, the Planning Board may require such conditions as will, in its sole discretion, substantially secure the objectives of the standard requirements so changed or modified.