Interior mailboxes are commonly found in residential apartment complexes and office buildings and often accommodate wall mounted or retrofit installation. These mailboxes come in many configurations for multiple residents or occupants with space typically designated for larger parcel deliveries. Pedestal mailboxes are commonly used in outdoor locations such as in neighborhood collection areas while single mailboxes are primarily used in residential applications. Courier companies will often place large steel mail collection boxes at high-volume pickup locations such as schools and office buildings.