The NYPD is looking for the suspects who followed a man into an elevator and then viciously beat and robbed him.
Police say the 74-year-old victim is in critical condition at Kings County Hospital following the weekend attack.
WABC-TV says the man was attacked as he exited the elevator at the Van Dyke Houses in Brooklyn where he lived.
Police released a surveillance video of four men believed to be responsible for the attack.
They ask anyone with information about the attack to call Crime Stoppers at 1-800-577-TIPS.