Insurance is a must.
Tell the city you are not a carrier. You do not take up the space a carrier would. Trading services is a good way to butter them up.
Design your boxes so you have 24x7 access to them. Even if it means a box outside of the nice building at the bottom. HomeLand security has scared many towns and cities about access. HS tells them a terrorist could taint the water supply. So they guard who has access quite a bit. Even if they never know when you are on the tower.--