By the time he purchased Oldfields in 1932, J.K. Lilly Jr. had been actively collecting rare books for about six years. He built a handsome, walnut-paneled library to house them by expanding what had been a sun room or enclosed porch at the southern end of Lilly House. This large but intimate Georgian-style library is the most remote and private room on the main level. French doors on the south wall open to an axial view along a path leading to the Formal Garden.