The Promenade at Downey development (known as Tierra Luna Marketplace) consists of 1.1 million square feet of retail commercial area, 300,000 square feet of office space and 116,000 square feet of hotel space (150 rooms).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.