Name one common maintenance task for building exteriors.

Cleaning gutters and downspouts is a common maintenance task for building exteriors because it helps prevent water damage by ensuring proper drainage away from the building's foundation. Over time, debris such as leaves, dirt, and twigs can accumulate in gutters and downspouts, leading to blockages. If not addressed, this can cause water to overflow, which might result in issues like roof leaks, foundation erosion, and mold growth. Regularly maintaining these components is essential to preserve the integrity of the building's exterior and prevent costly repairs.

The other options focus on tasks that relate to the interior or specific amenities within a building. Inspecting interior walls pertains to indoor maintenance, while updating interior signage involves tasks that have no direct impact on the building's exterior. Replacing elevators is a significant operational task that is also not relevant to external building maintenance. Hence, cleaning gutters and downspouts stands out as a critical exterior maintenance practice.