Questions that you might want to ask yourself are: Is the non-profit actually an entity that is separate from its "owner"? Does the non-profit actually own the "buildings" and does it really have "millions in their accounts"? Are there any valid defenses that the "non-profit" may raise against a breach of contact claim? The first thing that an attorney would have to do is review your agreement. Then get a detailed account from you as to what happened. Only then would an attorney know...