This location serves several important purposes. The Ashland Public Library is here with all its related materials and services. And ballots can be deposited in the nearby drop box during elections. Very convenient!
The cache is a hide-a-key container hidden completely out of sight, although it is easily reached. It is not attached to any utility object (such as the green one). You do not need to leave the public alley.
This area can be busy with muggles many times of the day. Please be stealthy! BYOP.