Find Us Center for Minimally Invasive SurgeryFind Us Hunnewell Building, 3rd floor The Center for Minimally Invasive Surgery is located on the third floor of the Hunnewell Building. Enter the hospital through the Main Entrance and walk up the stairs on your left. At top of the stairs, make a left. Continue past the ATMs (on your left). Follow the hallway and take a left after the restrooms. (You will pass payphones on your left). Follow the hallway to the end. The hallway leads to the Hunnewell Rotunda. The elevator is to the left of the open stairwell. Copyright © 2007 Children's Hospital Boston