The chairperson of the zoning board of adjustment or the chairperson of the building code board of appeals or, in the chairperson’s absence, the acting chairperson may administer oaths. Whenever the board exercises its regulatory or quasi judicial powers it may, at its sole discretion, compel the attendance of witnesses. All expenses incurred under this section for compelling the attendance of a witness shall be paid by the party or parties requesting that a witness be compelled to attend a meeting of the board.