One of the largest building projects in Missoula at 378,000 sq. ft., the Ambulatory Services Building (ASB) facility was constructed to replace the old Broadway Building that served the hospital since the early 1900s. The existing building was imploded in 2000 to make way for the new ASB building. The project was fast-tracked initially to facilitate advanced construction of the foundation system. The hospital addition includes two underground post-tensioned concrete parking levels for over 400 vehicles and seven above ground, steel framed levels. A deep foundation system was required for the underground parking, and some creative engineering was required to ensure the adjacent existing building above stayed put. Underpinned crib wall shoring was installed to allow for the new construction that was nearly 25 feet below grade.