Elvin - how much time has elapsed since you last communicated with Lennar? Was it a generic email sent to all on their "Interest List" or was it specifically addressed to you? It sounds to me like they were merely going through their Interest List and calling/ emailing everyone in hope of generating some interest, which it did with you. Legally, it doesn’t sound like you have any legal recourse, but you are right, they should at least notify you that their contacting people in itself, without more, does not obligate them to negotiate with you exclusively.