A.A. Will is an industry leader in the top down construction method of building construction. The foundations for a majority of the buildings built in Boston using this method were constructed by A.A. Will Corporation. Top down construction offers significant construction scheduling advantages over a traditional construction building sequence by minimizing the amount of below ground construction work needed prior to commencing the superstructure. Initially, a perimeter slurry wall is constructed followed by installation of prefounded circular drilled shafts or rectangular load bearing elements (LBEs) within the building footprint. The slurry wall acts as the permanent foundation wall and the drilled shafts or LBEs contain embedded structural steel columns that act as prefounded columns of the proposed high rise building. Once these elements are in place, mass excavation and basement slab construction can proceed from the ground level downward.