96-51 - Mandatory Tree Planting Provisions LAST AMENDED 6/6/2024 In addition to the applicable underlying #street# tree planting requirements, tree planting provisions shall also apply to #extensions# or alterations, other than #incidental alterations#, involving 30 percent or more of the existing #floor area# of a #building#. For #uses# listed under Use Groups IV(B), IX(B), or X, the #street# tree planting requirements of Section 26-41 (Street Tree Planting) shall apply.