There is only one way for certain:
- Do the supposedly unlawful thing
- Get sued (civil) or prosecuted (criminal)
- Go to court - if you win it wan't illegal
- If you lose, appeal to the next appellate court in the chain
- In one of those courts refuses to hear your appeal - it was illegal
- Repeat as necessary until you reach the Supreme Court - if you win it wan't illegal
- If you lose or the Supreme Court refuses to hear your appeal - it was illegal.
Of course, this whole cycle will take a few years and quite a lot of money.
Not certain but persuasive
Consult a lawyer: their area of expertise is knowing what the law is and how it will likely apply to your circumstances. Of course, they can be wrong about this because - see above.
Why is this so hard?
Common law jurisdictions, of which Florida is an example, do not have a "Code of Laws" where you can look things up and see if they are legal or illegal. The Common Law in Florida is partially enacted law (by the US, Florida, County, City and finally your housing corporation) and partially unenacted law (decisions made by courts about both the enacted and unenacted law). In fact, enacted law is usually quite ambiguous until it has a body of unenacted (or case) law that surrounds it and provides guidance on how the courts will interpret it.
Part of a lawyers skill is knowing (within their area of expertise) what the relevant case and statute law is with respect to the specific facts of the case, or knowing how to research them.
You can always take the Duke of Wellingtons approach.
In common law jurisdictions, everything is legal unless there is a law (enacted or unenacted) that makes it otherwise.
If you do not believe that the action you wish to take is illegal then advise the other party that you will give them 24 hours to come back with a court injunction to prohibit it, otherwise you will proceed.
You can't call a bluff harder than this!