The first permanent structure on the North Dakota Agricultural College (NDAC) campus was College Hall, also called the Administration Building, but more commonly known as Old Main. In February of 1891, the North Dakota State Legislature appropriated $25,000 to erect the structure. The cornerstone was laid in 1891 and construction was completed by the end of the year. College Hall contained classrooms, offices, and laboratories for the faculty, a room for the library, an uncompleted upper floor used as a gymnasium, and the office of the President. The postcard to the right is dated 1908.

The building remains today and houses the offices of the University President and other officials.