Within a project area, for any project undertaken by an agency for building rehabilitation or alteration in construction, an agency may take those actions which the agency determines necessary and which is consistent with local, state, and federal law, to provide for seismic retrofits as follows:
If an agency undertakes seismic retrofits and proposes to add new territory to the project area, to increase either the limitation on the number of dollars to be allocated to the redevelopment agency or the time limit on the establishing of loans, advances, and indebtedness established pursuant to paragraphs (1) and (2) of Section 33333.2, to lengthen the period during which the redevelopment plan is effective, to merge project areas, or to add significant additional capital improvement projects, as determined by the agency, the agency shall amend its redevelopment plan and follow the same procedure, and the legislative body is subject to the same restrictions, as provided for in Article 4 (commencing with Section 33330) for the adoption of a plan.
Ca. Health and Saf. Code § 33420.1