Before proceeding to make any such improvements or repairs or to award any contract or contracts for the making thereof, the Council shall cause notice of such contemplated improvement to be given to the owner or owners of any lands thereby affected; such notice shall contain a description of the property affected, sufficiently definite in terms to identify the same, as well as a description of the required improvement and a notice that unless said improvement shall be completed within thirty (30) days after the service thereof, it is the intention of said city to make such improvement or cause the same to be done pursuant to this Article. Such notice may be served upon the owner or owners resident in said city in person or by leaving the same at their usual place of residence with a member of their family above the age of fourteen (14) years, in case any such owner shall not reside in said city, such notice may be served upon him personally or mailed to his last known post office address, or it may be served upon the occupant of the property or upon the agent of the owner in charge thereof; in case the owner of any such property is unknown or service cannot for any reason be made as above directed, notice thereof shall be published at least once, not less than thirty (30) days before the making of such improvement by the city, in newspaper circulating in said city; there may be inserted in the said advertisement notice to the owner or owners of several different parcels of land. Notice to infant owners or to owner or owners of unsound mind shall be served upon their guardians. Where lands are held in trust, service shall be made upon the trustee. When lands are held by two (2) or more joint tenants, tenants in common or tenants by the entirety, service upon one (1) of such owners shall be sufficient and shall be deemed and taken as notice to all. Proof of service of such notices shall be filed within ten (10) days thereafter with the city officer having charge of the record of tax liens in the said city, but failure to file the same shall not invalidate the proceedings if service has actually been made as herein provided.