MSB II, as the new building is also called, is on Walnut Grove Street just north of the Psychology Building. MSB II provides about 65,000 square feet of laboratory space for neuroscientists, biogeochemists, environmental scientists, and other researchers whose work crosses the boundaries of traditional scientific fields. The space will be shared, with about three-quarters of the labs being assigned to faculty and researchers in College of Arts and Sciences departments, and one-quarter of the space being assigned to the School of Public and Environmental Affairs. MSB II, as the name may imply, is the second such structure. The first, Simon Hall née MSB I, opened its doors in 2007.