 Differences between the University of Washington and Sound Transit over station locations, impacts from the route's running under several science buildings on the campus, and construction impact deferments threatened to delay the project and raise costs.After months of negotiations, University regents and Sound Transit reached agreement in April 2000 with Sound Transit agreeing to install dampeners on the rails that run under the science buildings, air cushions to tables in the science buildings, and to mitigate environmental impacts due to construction and traffic impacts from having the station on university grounds.However, in November, the Sound Transit board voted to defer construction on the tunnel to the university when the construction estimate came in $171 million over budget.