I have heard the issue before was caused by the tiles in front of the above apartment sloping towards the door and the water has no where to run off. It might be worth checking to see if the upstairs door patio is flooded and if the drain at the front above your patio is not blocked. and then sweep it out to stop in leaking anymore.
If not pop in to the Millenium office at Al kazar and ask them to contact them for you. They may have the details now.
I have an upstairs apartment and confused by the water would leak into your hall way as it should be solid cement. I have heard that sometimes the water down the extractor fan chimney may blow in, if that helps.