It sounds like NAUH is positioning to close more of its campuses.
"As previously announced on March 22, 2018, NAU has consolidated several underutilized physical locations into existing operations. NAU recently liquidated two previously closed locations through cash buy-outs (Allen, TX and Tigard, OR), will be liquidating four additional locations through lease terminations (Albuquerque East, NM; Colorado Springs North, CO; Wichita West, KS; and Watertown, SD), and has successfully signed a sub-lease for the Austin South, TX location. The Company continues to utilize remaining locations while actively looking at opportunities to reduce its operating lease obligation. Through regular monthly payments, exercise of early termination options, and buy-outs, the Company was able to reduce its operating lease obligation by $8.0 million during the year ended May 31, 2018, and anticipates continued decreases in operating lease obligation in years to come."
https://www.sec.gov/Archives/edgar/data/1399855/000165495418009232/nauh_ex991.htm