 As of 2017, it is the busiest subway station in Brooklyn, with 13,571,093 passengers, and is ranked 21st overall.The control house has been listed on the National Register of Historic Places since 1980, while the station complex as a whole has been listed on the National Register of Historic Places since 2004, and is ADA-compliant.The IRT Eastern Parkway Line station was built first, in 1908, the terminal of a four-stop subway extension from Lower Manhattan to Downtown Brooklyn via the Joralemon Street Tunnel.