O'Brien Hall was built in May 2000, largely by the proceeds from the parish festivals reincarnated by Father Tom O'Brien in 1995. During the May Festival in 2000, the hall was dedicated by Bishop Thomas Flanagan and was named after Fr. O'Brien, who passed away on May 26, 2001 while still pastor of St. Jerome.
O'Brien Center has a maximum capacity of 600 persons and has 3 attached meeting rooms. Meeting room #1, Meeting Room #2, and Meeting Room #3.