A USPS approved vintage cluster mailbox in cast aluminum would be a great choice if you're looking for a stylish architectural mailbox with an old fashioned feel. Cast aluminum vintage mailboxes can really add a nice touch outside an apartment building, however when it comes to Cluster units you have to make sure to find one which is USPS approved, so there won't be any problems. 
Regency 8-Door Decorative Cluster Mailbox - Black
"The Regency Collection of decorative cluster mailboxes (which is USPS approved) is just what builders, architects and developers have long been asking for! These apartment mailboxes fill this need by converting a standard USPS collection box unit into an elegant mail center that will add curb appeal to any residential or commercial development. In addition to the eight mail slots and one outgoing compartment, this mail center features one extra large parcel compartment. Constructed of stringent aluminum with steel hardware, this 8-slot cluster mail box is available in Black." This units is so stylish, however a bit pricey, but that are hits yo have to take, if you're set on getting a vintage inspired cluster mailbox in good quality. This cast aluminum vintage mailbox will not stand in the way of old fashioned charm on a nice street; instead it will indeed add to it. So if you're looking for a vintage inspired cluster mailbox that actually is approved by the United States Postal Service, then you have a couple of nice, yet expensive options which would really add character to a neighborhood.
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