In all cases where site plan approval is required, as stated in other sections of this chapter, the review by the Board of Architectural Review for similarity, dissimilarity or inappropriateness shall be given concurrently or prior to the Planning Board's review for site plan approval. In all cases where site plan approval is not required by the Planning Board, such as for one- and two-family residences not part of a proposed subdivision, separate application shall be made to the Board of Architectural Review, and approval is required prior to the issuance of a building permit. In addition to any notice as may be required by law, the Board of Architectural Review shall cause notice of such application to be mailed at least 10 days before the date scheduled for the review of such application by the Board to all owners of property which lies within 300 feet of any boundary line of the property which is the subject matter of the application and to such other owners as the Board of Architectural Review may deem advisable. The names of said owners shall be taken as they appear on the last completed tax roll of the Village. Provided that due notice shall have been given as otherwise required by law and that there shall have been substantial compliance with the remaining provisions of this section, the failure to give notice in exact conformance herewith shall not be deemed to invalidate action taken by the Board of Architectural Review in connection with such application.