(1) All leasehold interests in port district facilities exempt from tax under RCW
82.08.980 or
82.12.980 and used by a manufacturer engaged in the manufacturing of superefficient airplanes, as defined in RCW
82.32.550, are exempt from tax under this chapter. A person claiming the credit under RCW
82.04.4463 is not eligible for the exemption under this section.
(3) This section expires July 1, 2040.