CBU commercial pedestal mailboxes in stainless steel would be a great choice if you're setting up mailslots for an apartment building or a business. These units are very sturdy and durable and come in various sizes. Some of these commercial mailboxes are very large whereas others are smaller, so there are plenty of options to choose between. You get three keys for each lock and all the installation hardware is included when you buy it. These types of units are great if you're concerned about durability and safety and want to make sure that the mail is very protected. With a model such as this one you are automatically up do date on all USPS standards and you have plenty of options to choose between. So no matter what type of commercial CBU mailbox you have in mind, you're sure to find something appropriate for your particular structure. 
8 Door C.B.U. with Pedestal by Auth-Florence
"Auth Florence CBU's are the highest quality outdoor centralized mail delivery unit available. As the ONLY supplier of C.B.U's to the United States Postal Service, Auth-Florence is proud to offer its customers the same security and reliability the U.S. Postal Service depnds on day in and day out. Designed to meet or exceed newest USPS standards. The cabinet is robotically welded with a full formed top and drip rail. Rugged, weatherproof powder coat finish resists scratching and vandalism. Constructed of 300 series stainless steel and aircraft aluminum." available at mailboxesresidential.com
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