Imposition of conditions. The Board of Appeals shall, in the granting of both use variances and area variances, have the authority to impose such reasonable conditions and restrictions as are directly related to, and incidental to, the proposed use of the property or the period of time such variance shall be in effect. Such conditions shall be consistent with the spirit and intent of this chapter and shall be imposed for the purpose of minimizing any adverse impact such variance may have on the neighborhood or community.