dunes and sand berms were no match for the 15-foot waves. new york's rivers surging over seawalls and into the streets of lower manhattan, flooding tunnels and forcing bridges to close in the storm. it was too much for one apartment building in manhattan. its entire facade collapsed. already the storm is being estimated at up to $20 billion. all right. let's get outside right now. the streets here in new york mostly vacant. here's a look, in fact, at iconic times square. >> but city officials have been responding to a major emergency at a nearby hospital as well as trying to assess the flooding. abc's scott goldberg is watching it, and he's on the phone here in manhattan. >> good morning to you. first, the emergency situation overnight. the nyu medical center here in manhattan, one of the nation's largest hospitals evacuated after the backup generator failed. more than 200 patients, including 20 babies at the