The Downey Landing Specific Plan has been in effect since February, 2002 and two of the projects that have been developed under it include the Downey Landing Retail Center and the Kaiser Downey Medical Center.he Amended Downey Landing Specific Plan is a request to amend the provisions of the Downey Landing Specific Plan that apply to the central 77 acres (the site Downey Studios occupies) of the 154-acre Downey Landing site in order to redevelop it into a mixed-use development.