The main building of Bennett College, Halcyon Hall, was built in 1893 by H. J. Davison Jr., a publisher from New York. The 200-room Queen Anne structure was designed by James E. Ware. It has five stories, a basement and sub-basement. Originally built as a luxury hotel, the building became home to Bennett College in 1907 after the hotel failed to catch on. The Bennett campus also included a chapel, stables, dormitories, an outdoor theater, and the Kettering Science Center, a state of the art building completed in late 1972. The cost of constructing the science building (needed to comply with new state science education requirements), along with other campus upgrades, contributed to the school's bankruptcy.

Halcyon Hall was never reopened and quickly fell into ruin. When the heat was turned off, water pipes burst, causing major water damage throughout the building. Large portions of the roof have collapsed and trees can be seen growing through parts of the building. Halcyon Hall is a popular site for urban explorers and photographers, due to its structure and decay. Several attempts were made in the 1980s to develop the property but all failed and the title was taken over by Mechanics and Farmers Savings Bank. The bank failed in 1991 and its assets were seized by the Federal Deposit Insurance Corporation. Halcyon Hall was scheduled to be demolished in 2012 but that never happened.

The property was purchased in 2014, with plans to tear down the remains of Halcyon Hall, and develop a park. In September 2021, the demolition necessary to create the planned 32-acre park began. Each building on the Bennett Campus, except for the centerpiece Halcyon Hall and the old Hale House, will have asbestos removed and then be demolished.

Adjacent to Halcyon Hall are the Bennett Commons apartments. These apartments were originally student quarters but upon closure of the school they were bought by a developer.

As of March 2022, The Abandoned Bennett College has been demolished.