2 of them appeared on my map, but going out there and checking them out doesn't seem to do anything. Can't get inside, can't get upstairs on the boat, found 1 lockbox though. There is a melee upgrade on one of the I'd love to get my hands on.
Do they unlock later in the story? I just met the "chairman" and got the 2nd apartment Can I actually gamble there if I ever get inside? I'd like to try something other than Rooster fights.