That stinks. I have to say though, it seems like the property owners are doing a lot to try and fix the problem. Sometimes you do everything you can to fix what you think is wrong, and something else happens.
I will say this, put the buckets down and re-route where the customers walk. No matter who's responsability the leak is, until it's fixed, you don't want anyone to get hurt in your store. I'd move the merchandise and rope off the area. Keep track of any lost business you may be experiencing because you may be able to get the owner of the property to compensate you for that, as well as any damages to your shop. Take pictures too, lots of them. Also, take down any of the wet ceiling tiles. You don't want to wait until they fall down themselves.
Try to stay calm though. Like I said, I've delt with many people who wouldn't have even shown up yet. From what you said, it does seem like they are at least responsive and are trying to get it taken care of.
__________________
|