It is not uncommon for condominiums to require that boats be stored outside of condominium property unless the property design included some type of marina facility or lot designed for boat storage.
The only way to understand what's allowed at a specific condo is to read the governing documents. The declaration and the rules and regulations documents may be good places to start looking.
The article "Condominium Association Parking Restrictions and Enforcement" by Florida condominium law firm Siegfried Rivera covers common issues that should be covered by condo parking restrictions or rules. Note that the Florida Department Of Business And Professional Regulation's "Condominium Unit-Owner Rights And Responsibilities" document does not seem to address boat rights for condo owners.
If the declaration limits boat storage, it's possible to amend the declaration through a membership vote. The process for amending the declaration can be found in the association's governing documents and may also be regulated by the Florida Statutes.
Some Florida condo buyers wish they had understood the boat storage available at a Florida condominium property before they had made an offer to buy.
Prospective Florida condo buyers should, if they don't understand condo association boat storage rules, engage licensed and reputable attorneys and advisors to guide their buying decision.