The Zoning Board of Appeals is empowered to authorize, upon appeal in specific cases, such variance from the terms of this chapter as will not be contrary to the public interest where, owing to conditions peculiar to the property, and not the result of the action of the applicant, a literal enforcement of the provisions herein would result in unnecessary hardship or practical difficulties.

As used herein, a variance may be authorized for height, area, size of structure, size of yards and open spaces or establishment or expansion of a use otherwise prohibited.

A variance shall not be granted solely because of the presence of nonconformities in the zoning district or uses in other zoning districts.

In granting any variance, the Zoning Board of Appeals shall prescribe any conditions that it deems to be necessary or desirable.

Variances granted shall be the minimum which would accomplish the purpose of providing for reasonable use of land or buildings.

Variances granted shall be in harmony with the general purpose and intent of this chapter and shall not be injurious to the neighborhood or otherwise detrimental to the public welfare.