I also thought the building is too small for a casino but that is what my friend told me today. He said that one of the people at the site said that a casino was being built there. I will check it out when I return to SXM in November.
I do know the Grand Marche was bought this year by a huge grocery chain and maybe they are weeding out the smaller non profitable units. I very rarely see a lot of people in the Gourmet Grand Marche. The Porto Cupecoy Grand Marche does very well though.