The United States Postal Service (USPS) guidelines state that only the 4 door, 8 door, 12 door, 13 door and 16 door (CBU) cluster box units mounted on a pedestal shown on the previous page, Florence Vital™ 1570 Series USPS Approved (CBU) Cluster Mailboxes are approved by United States Postal Service for Postal delivery. Any mailbox by any manufacturer over 16 tenant mailboxes mounted on a pedestal will need (USPS) approval. We suggest that you print the previous page and contact your local postmaster for approval. This is a custom order that cannot be returned. According to the manufacturer ships in 3 weeks plus 1 week for freight.