The building tower at 333 Bay Street (Bay Adelaide Centre) was constructed adjacent to an underground structure circa 2005. There is four levels underground parking garage at this property.

The three upper levels are suspended concrete slabs and the lower level is slab-on-grade. This parking provides approximately 1,100 parking spaces.

The suspended slabs are protected by a thin waterproofing system. Stephenson Engineering provided specifications and drawings including the contract administrations for the replacement of the waterproofing and overburden material.