He’s got his name on the New York Public Library, and now he’ll have a book inside, too.

Stephen A. Schwarzman — the billionaire boss of Blackstone Group who donated $100 million to the library in 2008 as part of a $1 billion expansion plan — is looking for a publisher, Page Six has exclusively learned.

A source said of the planned tome: “It’s not exactly a memoir,” but rather that the mogul’s been “talking about publishing a business book.”

Another source said Schwarzman’s currently “shopping it to publishers,” but we hear the book’s in the very early stages and there’s not yet a manuscript.

Forbes this week listed Schwarzman’s worth as $10.5 billion. A rep didn’t comment.