Crown Zellerbach was an American pulp and paper conglomerate based in San Francisco, California. It was purchased in a hostile takeover in 1985. Most of its pulp and paper assets were sold to James River Corporation, and are now part of Georgia-Pacific. Its name lives on most notably through the Crown Zellerbach Building in San Francisco (One Bush Plaza) and various philanthropic projects of the Zellerbach family. The company invented folded paper towels, cardboard egg cartons, and the window envelope.