You should bring the "brochure" and any other marketing materials, correspondence, drafts of a lease, etc. toan attorney to review them for you. IF any of them could be taken as constituting a firm offer, you may be able to hold the landlord to honoring it IF you clearly evidenced acceptance of the offer as it stood. Be aware that any number of caveats, restrictions, or "weasel words" in the materials (e.g. "as low as"--which does not guarantee that price for any particular person or unit) could preclude a firm offer being found. Also, if you counteroffered or wanted to change any terms, that would preclude an offer being found, since once you counteroffer, the original offer is rejected. However, if you feel that you were offered something sufficiently clear and unambiguous and that you evidenced acceptance of it, you may wish to have a lawyer double check your assumption, then take action, if appropriate. Good luck.