Forty-seven residents were evacuated from Hillside Manor around 8:30 p.m. Sunday.
Mayor Adam Forgie said the closing was caused by a number of issues, including a lack of staff, leaking pipes, an inoperative sprinkler system and detached smoke alarms.
The borough’s building inspector is reviewing the property Monday to see where they go from here.
Some of the residents went with their families, others were sent to Kane in McKeesport or the Walden Nursing Home in North Huntingdon.