The Planning Board shall notify, by certified mail, all adjacent property owners of the date, time, place and subject of the public hearing at which the site plan will be reviewed. Such notice shall not be required for adjourned dates. The records of the Receiver of Taxes of the Village of Millbrook shall be deemed conclusive as to ownership, and the notice shall be deemed complete when deposited in a properly addressed postpaid envelope in the United States Mail. In addition, the applicant shall post a sign on the property which is the subject of the application, at the applicant's own cost, containing the notice of public hearing at least 10 days prior to the date of the public hearing. The Planning Board shall determine the number, size and placement of the sign to be posted on the property which shall be in compliance with the requirements of § 230-20 of the Village Code. An affidavit of posting shall be filed with the secretary of the Planning Board at least five days before the public hearing. Reposting of such sign shall not be required for adjourned dates. An applicant shall not be deemed to have violated the requirement to maintain the notice sign if the sign is removed or destroyed by an unrelated party or natural force and replaced within a reasonable period of time. The sign required herein shall be removed within five days of the close of the Public Hearing. The Planning Board is authorized to develop and revise from time to time policies and procedures regarding the size of notice signs, the font size of the lettering appearing thereon, as well as the level of detail announced in the notice sign in order to best serve the needs of the Planning Board and the public.