Whenever the Department of Revenue has set aside and held for naught any assessment of property, except as otherwise provided herein, it shall give notice by mail of such action to the tax assessor of the county in which the property involved is located and to the owner of such property, by certified or registered mail, return receipt demanded. As soon as practicable after any property assessment has been set aside by the Department of Revenue, the department shall make a revaluation and, in the same notice, set a date for hearing objections, if any are made, to the valuation so fixed, and the hearing of objections shall be held at the office of the Department of Revenue, in Montgomery, Alabama, or at the courthouse of the county in which is located the property involved in the assessment, if demanded by the taxpayer, his agent or attorney, and when such assessment shall have been completed and made final by the department it shall notify the tax assessor of each county in which such property so revalued and assessed is situated of the amount of the assessment in such county, together with a general description of the property as assessed, which the assessor must enter in the book of assessments in addition to the assessments of other real estate and personal property.