You're right, 25 years is a very long period of time. Even though the government works in 25-year and long-term contexts like that, in the private sector many things can change quickly, and 25 years is a lifetime. So I think what PW will have to do--and again, I can't speak on their behalf--is be very careful about what the off-ramps may or may not be in negotiating the terms of the leases and about any financial penalties that may go with those.
On March 20th, 2007. See this statement in context.