If at any time it is desired to include additional real property within an improvement district, a petition for inclusion signed by the owners of real property to be included may be filed with the directors.

The inclusion petition shall describe the boundaries of the improvement district as enlarged by the proposed inclusions and give the names and addresses of the owners of the additional real property in substantially the same manner as in the original petition for forming an improvement district.

The same proceedings shall be had on the improvement district inclusion petition as upon the original petition for the formation of an improvement district.

The directors may prescribe any conditions upon the inclusion of the real property that they deem just.

If any conditions not contained in the petition for inclusion are prescribed by the directors the real property shall not be included until two-thirds in number of the petitioners approve the conditions in writing.