Big Tree Removal Mitigation Cost - Advice Appreciated!

[David Collier Jr]

Hello BP Members! I have a situation I am working through and was wondering if anyone had any advice to offer. 

I purchased a duplex w/ 2 large black olive trees. Under prior ownership, Hurricane Irma caused the tree to list and crack a concrete slab porch and damage columns on that slab supporting a roof overhang. Both of which require complete replacement. Long story short (4 months later) the city has finally approved the removal of the damaged tree after certified engineer reports and arborist evaluations. 

However, the city is requiring I meet mitigation requirements up to the appraised tree value of $7,900 either by planting new trees in equal value or payment into the "tree fund" of that value or the difference. I can not plant $7,900 worth of trees due to limited space which means a large check will have to be stroked.  

My question is, if as the result of a wind event/natural disaster, a tree is damaged and requires removal to repair structure and remove risk, can the city require the full mitigation be met to the appraised value OR because it was the result of a natural disaster do lessor mitigation requirements apply if any? 

I find it hard to believe that after a hurricane/tornado/etc, a city goes around hitting residents with mitigation costs/requirements (which homeowners does not cover) if a tree on their prop was damaged as a result of something beyond their control and now requires removal. 

I understand this may vary from muni to muni.. The city in question is Pompano Beach, FL.