The board shall send the notice to the owner of the land by certified mail if the owner is a resident of the township or is a nonresident whose address is known, and by certified mail to lienholders of record; alternatively, if the owner is a resident of the township or is a nonresident whose address is known, the board may give notice to the owner by causing any of its agents or employees to post the notice on the principal structure on the land and to photograph that posted notice with a camera capable of recording the date of the photograph on it. If the owner's address is unknown and cannot reasonably be obtained, it is sufficient to publish the notice once in a newspaper of general circulation in the township.
R.C. § 505.87