The FBI has moved its Boston offices out of the city, setting up shop on Monday in a brand-new Chelsea facility that authorities say will give them more room for their expanding operations.

The FBI Boston Division has begun working in its new headquarters at 201 Maple St., a 268,000-square-foot complex on 5.1 acres.

“This new facility will give our employees and law enforcement partners better security, upgraded technologies, and provide more room for our growing task forces,” Harold H. Shaw, the special agent in charge, said in a statement.