RSA 674:13 Appeals Where There is a Zoning Ordinance.

I. Any zoning ordinance adopted pursuant to RSA 674:16 shall provide that the board of adjustment created under a local zoning ordinance and having the power to make variances or exceptions in zoning regulations shall have the further power, in specific cases and by vote of a majority of its members, upon an appeal filed with it by the owner of any such land, to grant a permit based on considerations of justice and equity for a building or structure, or part thereof, in a mapped-street location shown on the official map, in any case in which the board of adjustment finds, upon the evidence and arguments presented to it upon appeal:
(a) That the property of the appellant of which such mapped-street location forms a part will not yield a reasonable return to the owner unless suc