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Two serious fires again took their toll on the campus. In 1917 the Williston Science building burned and in 1922 Rockefeller dormitory went up in flames just as the students were leaving for Christmas vacation. Through the generosity this time of John D. Rockefeller, Jr., a new dormitory was built the next year. The sciences moved to a newly constructed temporary location. This became the Service Building after Clapp Laboratory was built in 1923. The purchase of several village houses: Cowles Lodge, Mountain View, Woodbridge and Bridgman and the construction of Hillside dormitory (the Mandelles) in 1922, barely kept pace with the growing student enrollment.

Despite the financial difficulties of the depression years the College managed to build three more buildings as the climax of Miss Woolley's administration: a physics building (later named Shattuck, recalling the building torn down in 1954); an addition to the library in 1935; and a chapel in 1936, which incorporated the existing chapel in Mary Lyon Hall.

There were only two major land purchases during this period, the Kellogg farm in 1909 and the McElwain farm in 1914. The former extended east of Park Street and adjoined the College's Upper Lake property. In some cases the houses were moved to make way for new buildings. The College now owned 270 acres and 34 buildings.

To the south of Mary Lyon Hall is the Field Memorial Gate, erected in 1912 to commemorate the College's 75th anniversary.