Hi. I have the same problem. I am the lower unit. The upper unit water pipe leak because of our mistake drilling through the water pipe. Right now i have talk with the management, and I bear the cost of repairing the pipe. But unfortunately while repairing the pipe (which take about 3-4 days, major leakage) the upper unit staying outside ane they asked me to bare the cost of their hotel. Should i pay for their staying outside if according to law?