The final plan shall conform to the approved area plan, except that minor variations in layout may be permitted at the discretion of the Commission and without amendment of the approved area plan. Minor variations include, among others, a change in residential floor area, an increase in non-residential floor area of five percent (5%) or less and a change in layout, provided that in the case of a change in layout, the applicant shall provide the Board of Aldermen and the Commission each a revised area plan which incorporates such layouts. The revised plans shall each be signed by the applicant and owner(s) of record. Modifications, such as, but not limited to, a change in use, type of street, increase in density or intensity of development, type of dwelling unit or an increase in non-residential floor area of over five percent (5%), shall be considered major changes and shall require amendment of the approved area plan. The Board of Aldermen upon recommendation of the Planning and Zoning Commission shall determine whether a change is minor or major in accordance with this Article.