According to Bill :
FYI - The high-rise I once lived in had a separate water shut-off for each
floor.

Heh.

A friend wanted to replace a sink. There were separate shut-offs in
the basement (for a few apartments at a time), and had gotten permission
from the landlord to shut it off at a reasonable time.

The sink was a bit of a nightmare - iron pipe feeds, was only able to
get it working again by manually reaming out the stubs.

Then the fun began - when my friend tried to turn the water back
on, the shutoff broke...
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.