Construction completed 1910, Built 1907-1910, this Tudor Revival structure with its four towers is the landmark of the campus. In 1979, a fire destroyed the north wing and the west wing, the latter of which is largely restored. In addition, the entire second floor and a portion of the third floor have been extensively renovated. This historic building houses Admissions, Career Services, Graduate Office, Registrar’s Office, Scholarships and Financial Assistance Office, Cashiering, Bursar’s Office, and other administrative and student services offices. It was added to the National Registry of Historic Places in 2010.

The Administration has several nicknames that it has earned throughout the years. Some of the more popular names are the Castle and simply just Admin. Admin is home to a lot of the administrative offices and is home to some dietary science classes on the third floor. Admin is also one of the most iconic features of Northwest's campus. Admin is so iconic and integral to Northwest's identity that one of the most often used Northwest logos incorporates one of Admin's towers into the logo.

The Administration Building is also the oldest building on campus and has several odd stories that happened there. One of the oddest stories that took place there is the story of a night guard that was a little bit jumpy during his shift, While he was patrolling the building he came across a mysterious figure and after issuing several commands to the figure and getting no response, the guard opened fire on the figure. It turned out that the mysterious figure was the life-sized statue of Abraham Lincoln.