The Board purchased the farm in 1868 for $4,000 with the intention of constructing a new Academy building with separate dormitories for the boarders, a commodious school room and recitation room, a gymnasium, a baseball and croquet ground, a bathing and skating pond, and an English style park. During the construction of the new building, the Academy conducted classes in the boarding house (1866).

The 1870s
Records of the Academy from 1870 forward are sketchy. In 1870, Mr. Parkinson withdrew as Principal. He was replaced by co-principals R. C. Marshall and S. H. Coleman, a graduate of the University of Virginia. Both Marshall and Coleman resigned a year later to open a school in Talford. M. L. Massey was Principal from 1872 through 1873 and was followed by the return to the Academy of Mr. Coleman, who then remained until 1879. E. M. Magruder of Virginia then became Principal, but he soon resigned. His replacement was W. J. Thomas of Baltimore, a graduate of Johns Hopkins University, who remained one year.

The Trustees in 1870 were Elisha J. Hall, Dr. James S. Martin, Z. D. Waters, Dr. William B. Magruder, Thomas J. Holland, Henry C. Hallowell, and Thomas J. D. Bowie. The Brookeville Academy Catalogue announced that the Academy was a "new and elegant building-just completed and erected through the generous aid of Messrs. Lawrason Riggs and G. R. Gaither, of Baltimore, and Messrs. G. W. Riggs and W. W. Corcoran, of Washington, and some gentlemen of this county." (12)

12 Catalogue and Circular of Brookeville Academy, Montgomery County, Maryland, 1870-1871, (New York: George F. Nesbitt & Co., 1871.)