sentences:  In October 2019, ASU and Thunderbird held a groundbreaking ceremony to celebrate the start of construction on Thunderbird's new global headquarters facility adjacent to ASU's Sandra Day O'Connor College of Law on the Downtown Phoenix campus.The first classes in the new building will be held in the fall semester of 2021 when Thunderbird is celebrating its 75th anniversary.Thunderbird is described as a "unit of the Arizona State University Knowledge Enterprise."