The replacement fee provision that you quote above appears not to be a liquidated damages fee, but a processing fee for handling the substitution of tenants, but that's just an impression based upon the few provisions you have posted.

If your reference to statute means that you are taking the position that the fee is a liquidated damages clause is not compliant with Florida Statutes, Sec. 83.595, you will need to share the relevant information. Recall, we have no access to your lease or any addendum, and know only what you tell us.

In terms of the amount of liquidated damages, if you agree to pay a modest liquidated damages fee in order to be released from a contract, you benefit from avoiding liability for a potentially greater amount of damages if the landlord is unable to find a replacement tenant. As long as the amount of liquidated damages is a reasonable estimation of the landlord's typical damages for such situations, it doesn't matter if there is a potential that the landlord's damages may be lesser (or greater) in some cases.

FYI, caveat emptor: "An Avvo Rating is not an endorsement of any particular lawyer, and is not a guarantee of a lawyer's quality, competency, or character." If a rating says nothing about the lawyer's competence, character, or quality of their representation, it says... nothing useful.