Upon appeals, the Board of Adjustment shall have the power to:

(1) Hear and decide appeals where it is alleged by the appellant that there is error in any order, requirement, decision or refusal made by an administrative official or agency based on or made in the enforcement of the zoning regulations;

(2) Hear and decide, in accordance with the provisions of any zoning regulation, requests for special exceptions or for interpretation of the map or for decisions upon other special questions upon which the Board is authorized by any zoning regulation to pass;

(3) Hear and decide requests for variances. The Board may grant a variance in the application of the provisions of the zoning ordinance or code only if all of the following findings are made:

a. That there are unique physical circumstances or conditions, including irregularity, narrowness, or shallowness of lot size or shape, or exceptional topographical or other physical conditions peculiar to the particular property, and that the unnecessary hardship or exceptional practical difficulty is due to such conditions, and not to circumstances or conditions generally created by the provisions of the zoning ordinance or code in the neighborhood or district in which the property is located;

b. That because of such physical circumstances or conditions, there is no possibility that the property can be developed in strict conformity with the provisions of the zoning ordinance or code and that the authorization of a variance is therefore necessary to enable the reasonable use of the property;

c. That such unnecessary hardship or exceptional practical difficulty has not been created by the appellant;

d. That the variance, if authorized, will not alter the essential character of the neighborhood or district in which the property is located, nor substantially or permanently impair the appropriate use or development of adjacent property, nor be detrimental to the public welfare; and

e. That the variance, if authorized, will represent the minimum variance that will afford relief and will represent the least modification possible of the regulation in issue.

In granting any variance, the Board may attach such reasonable conditions and safeguards as it may deem necessary to implement the purposes of this chapter and the zoning ordinance or code. The Board is empowered in no case, however, to grant a variance in the use of land or structures thereon.

9 Del. C. 1953, § 6917; 56 Del. Laws, c. 97; 69 Del. Laws, c. 82, §§ 1, 2.