As I understand it, Sleiman has a right (or believes he has a right) to put up a fence. The businesses have been using his property in order to have the dumpster emptied, etc. If there is no easement, Sleiman probably does have a right to do that - apparently Moon River have a fence up in much the same way. Sleiman's statement alludes to issues with parking and possible antisocial behaviour on the part of the patrons of some or all of the affected businesses. Not sure if that's true or not - but it really doesn't matter in the event he has a right to put up a fence.
If he is within his rights, it raises the question of why those businesses (or their lawyers) didn't conduct their due diligence ahead of time. Surely if you were going to need to have guaranteed access via another person's property, you'd want to check it first.
I think they were closed by the Fire Marshall because of a violation resulting from the fence being erected - the businesses don't have an acceptable number of appropriate fire exits?
Sleiman is possibly being a total dick, but I doubt he's doing anything illegal. I feel bad for Jason, as he spent a lot of time and money getting his beer hall opened. I hope they can come to some sort of reasonable solution.