At Lucas Center, we designed underpinning and temporary excavation shoring for a 40-foot deep excavation immediately adjacent to an existing 2 to 4 story medical research facility. The existing building remained in service during construction and contained movement-sensitive nuclear magnetic resonance machines and 4-story glass curtain walls adjacent to the excavation. Additional constraints we were faced with included heavy construction/crane surcharges and existing utilities along the street adjacent to the excavation.