It is the intent of this section of the Ordinance to recognize that under certain conditions and circumstances, it may be necessary to obtain a variance from the terms of this Ordinance so long as said variance will not be contrary to the public interest, and where, owing to special conditions, a literal enforcement of the provisions of the Ordinance will result in unnecessary hardship or practical difficulties and where the granting of such variance will uphold the spirit of this Ordinance and contribute to the justice of the particular case in question. Any variance granted under the terms of this ordinance shall, however, relate only to area requirements and not to use. Furthermore, it is the intent of this section to establish a Board of Adjustments for the purpose of reviewing applications for variances as well as reviewing orders and decisions made by the Department of Planning and Development. [Code § 12.36-1.]