After such hearing, the Commission may establish the building or veranda line in accordance with such proposed order, or may modify the line as proposed in such order and establish the modified line, and shall appraise all damages therefor to the persons entitled to such damages, and shall assess upon the parties whose land is specially benefited by the establishment or alteration of such line, betterments or benefits therefor in proportion to the actual damages and special benefits to each respectively, and shall, within ten (10) days after establishing such line, appraising damages and assessing benefits therefor, cause the order establishing such line to be filed for record in the Town Clerk's office with a certificate signed by them, setting forth the damages appraised and benefits assessed on account thereof and shall also, within ten (10) days, cause such order and certificate to be published at least once in a newspaper having a circulation in the Town and a copy thereof to be sent by registered letter, postage prepaid, to all persons in whose favor damages are appraised or against whose land benefits are assessed.