Designed by Phoenix architect James Miller Creighton, construction of Old Main began on October 27, 1887.[2][3] The budget of $37,969 ran out before the roof was finished. When university officials discovered federal loans were available for agricultural schools, they renamed the building from the originally planned School of Mines to the School of Agriculture.[2] Federal funding allowed completion of the building and it opened for the first class of the university on October 1, 1891. Old Main, then the only building on the campus, contained the classrooms, library, offices, and dorms.