(a) In any community in which a military base is located, the Base Closure Commission has voted to close that military base, and the action of the Base Closure Commission has been sustained by the President and Congress of the United States, a project area may be adopted pursuant to the following requirements:
(1) If the project area is located entirely within the boundaries of a city, or city and county, then the redevelopment agency of the city, or city and county, may adopt the redevelopment project area pursuant to this part as modified by this chapter.
(2) If the project area is located entirely within the unincorporated area of a single county, then the county redevelopment agency may adopt the redevelopment project area pursuant to this part as modified by this chapter.
(3) If the project area includes property within the jurisdictions of two or more cities, or two or more counties, or a city and a county, or any combination of the foregoing, then all of the cities and counties the jurisdictions of which include property within the boundaries of the military base and any other territory to be included within the redevelopment project area may enter into a joint powers agreement, an agreement entered into pursuant to Section 33210, or other appropriate agreement for the purpose of creating a redevelopment agency and adopting a project area pursuant to this part as modified by this chapter.
(b) A redevelopment agency to which this chapter is applicable may adopt a project area either pursuant to this chapter or pursuant to other relevant provisions of this part.