I have owned a condo on the bottom floor of a two story unit for about a year now. Coming up on monsoon season here in Arizona, and for the second year in a row I have a leak in all four major windows of my condo. The leak is coming through the wall, inside, and destroying the plaster and whatnot of the window frame (not to mention getting water everywhere). The water is clearly coming from the condo above, which is being rented out although the owner and I are trying to address the problem. I am not that familiar with home improvements etc like I am with fixing cars, and as such do not have much knowledge to go on. The person who is also the HOA president read that there was a possible blockage of the seepage holes in his windows causing water to build up and therefore leak down through the wall and into my condo's window frames. Well yesterday we cleaned out his windows and the holes and using a hose sprayed them down with water, and it still leaked. We have eliminated the cause as a problem with the roofing of sorts (the unit is a stucco, flat roof, flat sides, etc) because we did not spray water that high, only at his windows. The only thing I can possibly think of is the windows more or less sit flush with the outside of the building. There are parts of my window where you can sort of see the wall and it's direct connection to the window, and so water could seep through that connection (I would assume) and I assume his windows are the same way. (Not sure if that makes sense) As such the windows have all be caulked on the outside where the window meets the stucco but to no avail. I'm not sure what to do because the guy is VERY nice, but I'm sick of this problem. It is either his or the HOA's responsibility to fix the problem, depending on what the problem actually is (if it's outside it's the HOA's, if it's his actual windows, then it's his problem). I am getting close to wanting to sue as this is an ongoing problem for about a year (fortunately it doesn't rain much here) but I don't feel I would have much of a case because he can prove that he is at least making an effort to fix the problem... Any advice on either situation would be greatly appreciated.