If you want to disable or enable structure decay on your Front server, it's easy to do so. Disabling the rot/structure decay will make it so structures will require no upkeep and stay there forever.
1. Open the Basic Server Settings
2. Under Extra Args, add the parameter -ConstructEnableRot=1
to Enable decay or -ConstructEnableRot=0
to Disable decay
3. Click Save Config & Restart Server and your changes will apply