Would it be a benefit for the owner of restaurant (eg La Belle Province at marche central) to give us permission to be there. The owner would make some good cash that night and we would be there everyweek. It makes sense to me.
Well first off the parking is not private property. Secondly if everyone was holding a patate frites in their hands the cops could do shit about it. Everyone is there to eat. They can't kick you out of there.
If you want permission to be there go in the restaureant and buy something. Otherwise park in the back of the lot and leave the spaces in front for his clientele. Use your common sense.