Dozens of families that occupied approximately 30 apartments in an East Harlem apartment house found themselves out on the street yesterday, with what little belongings they could gather together as they were hustled from their homes. The Dept. of Buildings condemned the structure on 2nd Ave. and 120th St., noting that several partitions had recently been removed from the building's basement, causing the building's floor to sag in a sign of potential imminent collapse. In......