2005 California Public Resources Code Sections 9851-9855 Article 3. Inclusion of Land

9851.  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.
9852.  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.
9853.  The same proceedings shall be had on the improvement district
inclusion petition as upon the original petition for the formation
of an improvement district.
9854.  The directors may prescribe any conditions upon the inclusion
of the real property that they deem just.
9855.  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.