Pile Foundation Construction Company built an $83 million cut structure, which extends the tracks under Northern Boulevard into the Sunnyside Yard. It created an area that served as both the launch chamber for soft-bore Queens tunnels, connecting the 63rd Street line to the main LIRR branches, and an interlocking and emergency exit and venting facility. The cut was then covered with a deck. In August 2009, Perini Corp. was awarded a $144 million contract to reconfigure the Harold Interlocking, increasing its capacity to accommodate trains bound for Grand Central Terminal and to construct new yard lead tracks to allow trains to enter the storage yards. Smaller contracts for structural work, environmental monitoring, and data measurement were also awarded. Some Amtrak buildings in Sunnyside Yard were demolished to make room for the East Side Access portals in Queens.