My understanding is the bathroom is like for like assuming you are not moving plumbing.  

Roof, flooring, walls, plumbing, windows, etc.

I would suspect the buyer has a background in plumbing so they are sensitive to this, or they have had a property with this issue in the past, or they are simply making noise with the hopes that they can get a price reduction. 

First see if it's possible to separate the plumbing for each unit so each unit can have their own meter and account.

I can use them for plumbing electrical work sheet metal work or just holding something that my hands aren't strong enough to hold. channel locks are a must-have. if you can't think of a use for them just have them and you'll find one.

We just finished doing the comprehensive and plumbing inspection last week and will need to decide if we want to move forward with this property soon.There are two major repairs that I would like to get estimates on.

Moving a few walls aren't too bad, however if they took out kitchens/bathrooms and reworked electrical and plumbing, you are looking at a bigger bill.The pool can be good/bad.

looking to finish a 18x12 shed on a concrete pad..it will have plenty of electricity ..finished drywall walls and ceiling...windows..beautiful matching outside finish...this will be in Cotswold neighborhood.. it will have heating and air conditioning...no plumbing no bathroom.. 

If there is someone that does electric or plumbing that would also probably be a good gig to learn. 

If I ask for disclosures on structural defects, plumbing, electrical, etc., is the seller required to provide them?