(a)
(1) A lawsuit under this subchapter shall be filed by the one-hundred-eightieth day after the date the private real property owner knew or should have known that the regulatory program restricted or limited the owner's right in the private real property.
(2) The statute of limitations begins upon the final administrative decision implementing the regulatory program affecting the owner's or user's property.
(b) A program is implemented with respect to an owner's or user's property when actually applied to that property.