After the establishment of an improvement district within a district pursuant to this article:
(a) All proceedings with respect to the project or unit for which the improvement district was established shall apply only to the improvement district.
(b) Any election with respect to such project or unit or bonds therefor or warrants relating thereto, held pursuant to Chapter 2 (commencing with Section 42300) of this part, Chapter 3 (commencing with Section 42500) of this part, Part 7 (commencing with Section 44400) of this division or Part 8 (commencing with Section 45100) of this division, shall be held only within the improvement district.
(c) Any assessment with respect to such project or unit shall be levied only upon the land within the improvement district.
(d) Any bonds or warrants issued with respect to such project or unit shall be bonds or warrants of the improvement district, secured by an assessment levied upon the land within the improvement district only, and that fact shall be indicated on the face of each such bond or warrant.