Massey Hall, renamed Scott Hall in 1960, was built in 1907 by the Massey family to provide space for study, reflection and religious services on the property of the Muskoka Free Hospital for Consumptives. It survived the catastrophic fire of 1920 which destroyed many of the buildings at the Free Hospital, and continued to play an important role in the life of the sanatorium which merged with the Muskoka Cottage Sanatorium to become Muskoka Hospital. Massey Hall became a sanatorium recreation centre where mainstream Hollywood films were shown and entertainment created by the patients and staff, as well as town theatre groups, was presented.

In 1957 the former Free Hospital property was purchased by the Ontario Government to fulfill legislation tabled in 1949 to provide a residential fire college for the training of Ontario fire servicemen. The man directly responsible for that legislation and for the ultimate opening of an Ontario Fire College in Gravenhurst was William J. Scott, Fire Marshal of Ontario from 1935 to 1960 and internationally renowned fire service educator and innovator.

The Ontario Fire College became the first residential fire college in Canada and one of the first in North America. The college has continued to educate fire officers from departments across Ontario, from other provinces and from countries around the world. Massey Hall continues to play a vital role in courses and seminars offered at the Ontario Fire College today.

Scott Hall is a one storey, rectangular plan, wood frame construction with a steep pitch Dutch gable roof, flat roofed dormers with clapboard siding and paired six paned windows oriented into two columns on the north and south elevations, a stone and stucco chimney on the east elevation, inset columns with plain capitals and stone bases between large flat-headed and segmented windows, clapboard siding, and a stuccoed stone foundation between the column bases. The east elevation features a one storey projecting bay with a hip roof, clapboard siding, inset columns with plain capitals and stone bases on the east elevation of the projecting bay, stuccoed stone foundation between the column bases, flat-headed six-paned windows arranged into two columns on the north and south elevations, flat-headed four-paned windows flanking a double door central entrance on the east elevation, a segmented semi-circular window above the entrance, and a semi-circular pediment.