A huge and previously unknown trove of archival material from Philip Johnson’s architectural practice — including his hand-drawn sketches for towers that helped define postmodern architecture — is to be put up for sale by one of Johnson’s former partners, who has had them in storage for years.

The architect Robert A. M. Stern, dean of the Yale School of Architecture, said he was sorry that even the single rendering had been sold separately. Although he has not seen the materials, he said, it was clear to him that “the worst thing would be breaking the archive up.”

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