In April, a seven foot tall presentation drawing of the AT&T building was purchased by the Victoria and Albert Museum in London for $71,000, one of the highest prices ever paid for a “modern architectural drawing,” according to a release. The Philip Johnson drawing was sold through the Wright auction house in Chicago, which has become a specialist in selling architectural materials. The V&A will show the piece in an upcoming exhibition on postmodernism. It is one of only a handful of works by an American in the museum’s 35,000 piece architecture collection.

The building is famous for its “Chippendale” top, which, when it opened in 1984, signaled the ascendency of postmodernism and the return of historical styles and classical references to the architectural vocabulary.

The drawing is part of a larger archive of Johnson’s work, which includes thousands of drawings, plans, and photographs of AT&T, Pennzoil Place, PPG Place, and the Chrystal Cathedral. The owner of the archive wishes to remain anonymous, according to the release.