This latest phase triples the size of the emergency department, adding two triage rooms and expanding the area for patients whose injuries do not require a bed.
Several EMS workers were rushed to the hospital after being attacked in the Bronx on Thursday.
The hospital's owners, Hudson Regional Health, planned to suspend emergency services beginning Saturday night after shuttering the rest of the hospital last fall.
Embassy Diner owner Gus Tsiorvas generously donated breakfast for 80 workers at St. Joseph Hospital during the height of last week's historic snowstorm.
After pushback from the community, the hospital's owners say they will keep the Emergency Room open for another two weeks.
A baby born weighing just over a pound is home after spending 285 days in the neonatal intensive care unit at a New Jersey hospital.