A. 
The Commission shall investigate, pursuant to requests from property owners or on its own motion, possible improvements or areas to be designated as a landmark, landmark site or historic district. The Commission shall poll the owners of the property in the proposed district or of the proposed landmark or landmark site and shall not create the landmark, landmark site or historic district without the approving vote of 70% of the owners of the affected properties.
B. 
For the purpose of this section, the owner or owners of each separately assessed parcel shall be entitled to but one vote, notwithstanding that title may be held in joint ownership or tenancy in common or similar multiple-party ownership.
If the Commission shall deem an improvement parcel appropriate for the designation as a landmark, landmark site or historic district and if the owner of the improvement parcel concurs in accordance with the required poll, the Commission shall then call a public hearing which shall be advertised in the official Town newspaper at least 15 days prior to the date of such hearing. A written notice of such hearing shall be sent to the owner or owners of any property proposed to be designated as a landmark or landmark site or placed within an historic district. In addition, all owners of property adjoining the proposed historic district, landmark or landmark site shall also be notified.
Within 20 days following the adoption of a resolution establishing a landmark, landmark site or historic district, such site or area shall be so designated on the Official Map of the Town and will indicate the portions of the land, if any, embracing the landmark, landmark site or historic district.