(1) If, upon the facts presented at the hearing, the board of adjustment determines that there are great practical difficulties or unnecessary hardship in the way of applying the strict letter of any of the land use regulations upon the lands of the petitioner, it shall make and record that determination and shall make and record findings of fact as to the specific conditions which establish the great practical difficulties or unnecessary hardship.
(2) Upon the basis of the findings and determination, the board of adjustment may order a variance from the terms of the land use regulations in their application to the lands of the petitioner that:
(a) will relieve the great practical difficulties or unnecessary hardship;
(b) will not be contrary to the public interest; and
(c) will be such that the spirit of the land use regulations is observed, the public health, safety, and welfare is secured, and substantial justice is done.