This chapter does not apply to:
(1) the construction, renovation, or equipment of the Darrell K Royal-Texas Memorial Stadium or to improvements related to the stadium, except that the height of the stadium or a related improvement, other than the north end of the stadium or a related improvement to the north end of the stadium, may not exceed 670 feet above sea level;
(2) the construction, redevelopment, or improvement of 11th Street pursuant to the East 11th and 12th Streets Redevelopment Program, except that the height of an improvement may not exceed 600 feet above sea level; or
(3) the construction, redevelopment, or improvement of Robert Mueller Municipal Airport under a redevelopment and reuse plan for the airport adopted by the City of Austin.