West Hollywood is dominated by older multi-family buildings, many of them small, and that determines nearly everything about how a loss here goes.
One failure affects several households. Water travels down through the structure, and the unit that reports it is frequently not the unit where the problem started.
What goes wrong in West Hollywood buildings
Ageing supply risers, water heaters in shared closets, and second-floor bathrooms above living space are the recurring sources. The bathroom above is the classic, because a slow failure at a toilet or a tub surround wets the ceiling below for a long time before it stains.
Access is the practical constraint. Getting to the source often needs a resident who is not home, a manager who is not on site, or a common area that is locked.
My ceiling is stained and the unit above says nothing is wrong.
That is common, because a slow leak may not be visible from inside that unit. A moisture meter reads it through the floor assembly, which settles the question without anybody guessing.
Should I tell the building or handle it myself?
Tell the building immediately and in writing, whatever else you do. Delay is what turns a covered loss into an argument about who let it run.