The superintendent has drywall up, finishes moving room by room, and an owner asking whether turnover is still real. Then the permanent gas service date moves out by three weeks. Boilers can't be commissioned, gas appliances can't be tested, winter freeze...
A lot of jobs don't get knocked off track by one dramatic disaster. They get stalled by a smaller, uglier problem. Cold weather hits early, the permanent gas service still isn't live, temporary heat wasn't booked, commissioning can't proceed,...