SDCL § 11-14-13: Findings of fact as conclusive on court--Objections not urged before board.

The findings of fact by the board of appeals, if supported by substantial evidence, shall be accepted by the circuit court as conclusive, and no objection to a decision of the board shall be considered by the court unless such objections shall have been urged before the board, or, if it was not so urged, unless there were reasonable grounds for failure to do so.