No building permit shall be issued for any residential, commercial, public or quasi-public structure until the site plan has been reviewed and approved by the Planning Board except that the approval of a site plan for a single family and two family dwelling or minor repairs and alterations shall not be necessary. All site plans in the CBD Zone, however, shall be reviewed. The Planning Board shall review the proposal, determine whether or not the applicable standards provided by this Ordinance have been observed, note objections to such parts of the plans as do not meet the standards, make corrections and recommendations for desired changes to effect compliance with the Ordinance, be satisfied that the site plan represents the most desirable alternative for development of the site in compliance with the Ordinance, and when satisfied that the site plan complies with the requirements of this Ordinance, shall approve the site plan.