Where is that sound coming from?!
after much searching and looking around I finally found the source of that annoying sound! the bathroom is leaking. and not any kind of leak, it was leaking from the ceiling! but wait there is more, the water is actually coming from the light bulb in the bathroom’s ceiling!
I called the doorman/janitor and told him about it. he said it must be coming from the A/C’s machine, which is located right above that ceiling. he told me he’s going to call the A/C’s company and that they’re going to be here first thing in the morning.