Can a penthouse owner play the Casino Missions as a host after completing them?
Solution 1:
Yes, he should have the Ab mission spot on the map within the casino to replay any mission after completing them all. No phone calls or waiting needed. They'll also get them as options when you do 'Replay Job'.
Once you've done them once, you won't get the first-time money rewards again though - host or not. You'll have to host them all in sequence to get the free car at the end.