A. The owner of real property on which any building is located which is habitable or tenantable for residential, commercial, business, storage, or other purposes shall be responsible for ensuring that the numerical designation is conspicuously displayed on the building to which it is assigned. The numerical designation shall be easily legible with the numerals not less than four inches in height and the numerals shall be displayed upon a contrasting background.

The numerical designation shall be displayed upon the building unless the building is not clearly visible from an adjacent way-of-travel in which case the numerical designation shall be displayed near the main entrance to the property upon which the building is situated. Additional house number signs should be displayed at any intervening turns between the named roadway and the addressed building.

In mobile home parks, addresses, or lot numbers are assigned to the lots and not to the mobile homes themselves. The owners and managers of mobile home parks are responsible for ensuring that each mobile home space is marked according to the criteria of size and contrasting color as described above. The numerical designation shall be easily legible and affixed to some permanent structure located on the mobile home space.

B. Buildings which are accessory to buildings which are required to be numerically designated need not, but may, be numerically designated. Unimproved real property need not, but may, be numerically designated.