Which Mailbox Cluster Should You Buy?

Dustin Edwards • April 30, 2025

For those landlords with multi-unit rental properties, mailbox clusters may seem like a small detail. However, they’re quite important, as they allow for efficient mail distribution, instead of a carrier going to each resistance individually. This can reduce foot traffic, package thefts, and complaints, which can improve tenant satisfaction


There are a few different styles of mailbox clusters to choose from. Today, we’ll review the differences between mailbox clusters and how picking the right one is easier when you know what you’re looking for.


Main Styles of Mailbox Clusters

The first style of mailbox cluster is the cluster box units (CBUs). These are freestanding boxes, mounted on a pedestal. These are typically installed outdoors and come in configurations of eight to sixteen units plus parcel lockers for larger packages. CBUs are secure and weather-resistant, but they need little maintenance. They are ideal for properties with outdoor common areas. CBUs are known to be cost-effective over long periods of time, as they rarely need replacement and are easily serviced when needed. For investors with multiple buildings, CBUs provide a simplified mail delivery that can reduce confusion between tenants and carriers.


4C horizontal mailboxes are similar to the CBUs in design, though they’re installed inside the walls of a building’s lobby. These are typically installed when the building is first being constructed or major renovations are occurring. Additionally, when installed properly, they meet the ADA accessibility standards, which makes 4C mailboxes a smart, future-proof investment. These mailbox clusters can also help to improve the aesthetic of your property. While having a clean look, they’re also highly secure as they’re built into the lobby walls.


The 4B+ and vertical mailboxes are generally used in older buildings. Though they are no longer USPS compliant, they are approved for replacement and retrofit installations of existing models. They may preserve the charm of historic buildings, though most tenants would rather have secure mail. Vertical mailboxes are often the source of complaints due to their narrow size and vulnerability. This can lead to letters being damaged upon delivery as well as an increase in package theft.


What to Consider

When making your choice of mail clusters, there are a few items you should consider. Think about where you’re going to install the cluster. For example, if you have an exterior gate entry system, you may want to install an outdoor mailbox cluster. Many modern adults receive deliveries regularly, meaning you should consider mailbox clusters with more parcel lockers. USPS compliance is crucial for new installations as these have strict regulations that govern placement, height, and accessibility. This is why properties subject to ADA requirements oftentimes go with 4C horizontal mailbox clusters.


The appearance of the mailbox cluster is also important. As this is going to be a visible part of the property, it can influence first impressions and curb appeal. Finally, you’ll need to understand how durable you’ll need the cluster to be, especially if it's an outdoor unit, as it may be subjected to
vandalism and tagging.


For the majority of landlords looking for a new mail cluster, you can't go wrong with CBUs or 4C horizontal mailboxes, as they’re both seen as secure, built to last, and USPS compliant. Whereas vertical mailboxes should only be used when necessary. Whichever you decide to install, the right mailbox cluster should be part of a well-managed property. If finding the right mailbox cluster feels overwhelming or you need help managing your Beach City rental property, we invite you to call us today at (562) 888-0247 or complete our
Owner Application online.

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