Crews are scheduled to demolish an old toll administrative building on State Route 520 on Monday, launching major construction on Eastside highway, interchange and transit-access improvements.

The Washington State Department of Transportation (WSDOT) is demolishing the toll building to make way for construction on the corridor. Demolition is scheduled to begin at noon.

Earlier this month, construction began on the $306 million SR 520 Eastside Transit and HOV Project. The work will require complete closures of the SR 520 floating bridge and highway during as many as 20 weekends through December 2013.

Complete closures in June: Drivers will need to plan ahead to find another way across or around Lake Washington June 3-6 and June 17-20. The SR 520 floating bridge and highway will completely close both weekends from Montlake Boulevard to I-405. Additional complete closures during weekends are likely each month through November.