Sheahan Hall is one of Marist's traditional residence halls and houses approximately 130 first-years. There are four floors in this building, and it is equipped with two main sets of stairs. Residents live in double rooms.  Double rooms are furnished with two beds, two desks, and two dressers, as well as an in-wall closet.  Laundry facilities are located on the ground floor of Sheahan Hall.  This residence hall is co-ed by floor, with each floor having a shared bathroom with showers, lavatories, and sinks. There is one RA per floor and one RD for the entire building.

Entry into Sheahan Hall is done by swipe access through the main door to the residence hall. Each student must swipe his or her Marist ID card to get into the building.