In the city of Lexington, it is an ordinance that the property owner must have a permit to remove or replace a street tree.
If a street tree is removed, a replacement tree must be planted within one year.
The following are clips from the LFUCG Street Tree website.
LFUCG Street Tree Website
Permit Application Page: https://lexingtonky.formstack.com/forms/street_tree_removal_and_planting_permit_application