Extension for extraordinarily expensive structural changes.--
The Secretary may extend the 3-year period under subparagraph (A) up
to a 30-year period for key stations in a rapid rail or light rail
system which stations need extraordinarily expensive structural
changes to, or replacement of, existing facilities; except that by
the last day of the 20th year following the date of the enactment of
this Act at least 2/3 of such key stations must be readily
accessible to and usable by individuals with disabilities.