From the South: follow Brooks Street toward downtown Missoula. Take a right on Kensington Ave (at Baskin Robbins). The Aaron Building is 2 blocks in on your left, with plenty of lot parking.
From the North/Downtown Missoula: follow Higgins south from downtown Missoula. Follow the street to the slight right on Brooks Street. Take a left on Bow Street, near the billboard for the Montana School of Massage. Take the 2nd left on Kensington Ave. The Aaron building is right at the corner of Bow and Kensington.