Ya , the BMSMA is for private properties...MCST in general. Onus on the top unless otherwise proven. Usually, can do injection to the leaking areas to plug the seepage. If your condo is under warranty, get the MA to get the main contractor to settle the matter. Warranty for water proofing is usually for quite a number of years (not the usual DLP period). But of course, confirm with your MA on the warranty matter, sometimes, the MA may be able to get the main contractor back to look at the problem even though warranty is up...;p Be nice to the MA, and sometimes it helps

btw, I am not from MA..:bsmilie:
water seepage can be difficult to trace. So the injection by force will actually forces its way back through the "weak" route and cover it. So it must be done properly, otherwise the water will just find the next weakest route and then you find yourself with another seepage at another area.
Agree with Austin, the ROOT CAUSE must be found, otherwise the problem will keep coming back, sometimes evidence of a leak may appear far away from the actual source of problem
If at the end of the day, there is a dispute between you and your neighbour, then you can take your case to BCA which is administering the BMSMA.
For new projects, the units are under Defects Liability Period. (There is a difference between buying a new unit from the developer
before the MCST is set up and buying a unit from the developer
after the MCST is formed, although technically in both instances, they are new units bought from developer, the warranty issue may be a little more tricky. Some will start to "Taichi" here and there.