Upgrade Electric Service entire park

Hi,

We own a 45 space park in Arkansas. We are in the process of upgrading the electric service on each of the lots. It is outdated and constantly causing issues for our tenants. Does anyone have any idea approximately how much it should cost to upgrade the breaker box and run new wiring to the home? We know it is not cheap, but just wanted to see if anyone has done a similar project. Thanks!