Yes. They're often referred to as "dockominiums". I know that Oceanside Marina in Key West (Stock Island) was going that way, but their web site does not mention anything about it. You might try calling there and asking for Roger Green. Last I heard, he was the dockmaster. Tell him that "Chuck from Penske" told you to call.
If he can't help, try The Dockominium Group . That looks to be the hot ticket. Oh - warm up your checkbook.