A variance is a modification of the dimensional limitations of this Title as to lot area or width; street frontage; front, side and rear yard setbacks; building height; site coverage; or other regulations affecting the size or shape of a structure or the placement of structures upon lots, or the size of lots. A standard variance may only be granted by P&Z and only where it will not be contrary to the public interest and where, owing to conditions peculiar to the property and not the result of the applicant’s actions, a literal enforcement of this Title would result in unnecessary hardship. A secondary unit variance shall only be granted by the P&Z Chair to facilitate the development of a secondary dwelling unit, and only if the criteria established herein are met. P&Z may also vary the application of the zone district regulations for the purpose of considering access to sunlight for solar energy devices.