I thought  @Elliot B. was talking about installing meters on the supply and return pipes for each unit and measuring BTUs there.

Nice to have on the counter.

Who do you call if a pipe breaks at 7 pm?

So we counter back at half   or less of what the broker ask's for..

One must pause when someone offers advice on getting rich the most likely case is they are making more money selling you a pipe dream, if it was lucrative why would they not just be doing it.

If you are doing direct replacement, like replacing a sink, shower, and the stacks and pipes are staying, you probably do not.

These have two very different next steps.If it is a condo, you need to check your condo docs and see where the unit ends and what is common area. if its a leak in a pipe in a wall that is typically common owner and the condo association should take care of it.

How about when your competition is using bathroom sinks that are the ones that bowls ON the counter instead of in the counter?

The last property I sold I countered with 1) the buyer’s inspection is a yes/no within 5 days, no discounts will be given. 2) they asked for $5k off and I countered with I would discount up to $5k but the amount of the discount is the amount of EMD that is non-refundable.

If the mold is caused by a leaking pipe or water getting in from outside, then you should hire a contractor to stop that intrusion immediately, then dry out the home and remediate the mold at your expense.I also recommend reading and sharing the EPA Mold Guide.