I didn’t get that involved but was told it wasn’t a matter of cost. There were very limited hookups that could be moved slightly for the sinks. Bathrooms could not be moved or modified in any way. I assume it’s a limit on the overall building in/output.
There were very limited hookups that could be moved slightly for the sinks.
This means you couldn't chip up the concrete slab to place new pipes, the way we could in e.g. a strip mall. This is an understandable limitation, because the integrity of slabs is important for tall buildings.
However, this wouldn't be a limitation in a residential remodel. They aren't going to mess with the slab or the pipes in it. They're just going to lay everything over the top of the slab. If the new toilet is 40' from the utility shaft, that is 3" for the pipe plus 5" for the fall. Add an inch for the floor itself. Average residential ceilings are much lower than average office building ceilings, so there is definitely at least 9" to spare.