Rain + Old Construction = Wet Mess

The Bowen School of Law occupies a lovely building built by the WPA in 1933. On most days, it's a thrill to walk the halls of a monument to depression era industriousness. On days when it rains, the place is a maze of trash cans and carpet dryers. Seriously, this is a five story building. How can the ceilings be leaking on the first floor?