If at any time it is desired to include additional land in an improvement district, a petition for inclusion signed by the holders of title to the land to be included may be filed with the board.
The inclusion petition shall describe the land in the improvement district as enlarged by the proposed inclusions and give the names and addresses of the owners of the additional land 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.
If any conditions not contained in the petition for inclusion are prescribed by the board the lands shall not be included until two-thirds in number of the petitioners approve the conditions in writing.