Before work starts, we identify what must remain available: entrances, tenant circulation, service access, rooftop equipment and interior work areas. A phase has a defined watertight boundary. We coordinate delivery, hoisting, equipment shutdowns and temporary protection with the facility contact. A weather delay can leave an open area and other trades waiting, so daily closure matters. The proposal should show work windows and what each stage returns to service. Our occupied-building plan and initial inspection establish those limits before materials are ordered.