You are looking more of the large manufacturing facility or chemical company type place.

This outgass chemicals can cause headache, vomiting taking forever to get rid of it.

The cost of this will not only be filling the pool, but the constant maintenance (treating it with chemicals and possibly having it cleaned) and increase in insurance.

I've got cash to close the deal and/or preapproval for financing if needed.Why I'm looking for this specific building type and location is that my other company manufactures construction chemicals and products, with an emphasis on masonry restoration and adaptive reuse of buildings, based in Lawrence KS.

Speaking of costs, if I did have a rental with a pool, I would factor in the cost of you (the landlord) providing/paying for the regular maintenance and chemical treatment because tenants aren't likely to do it (at least not properly). 

If he has been living in the house for 20+ years and is a moderate to heavy smoker, there may be rooms where scrubbing, sealing and painting simply won't keep the chemicals from coming to the surface and you will end-up pulling down the drywall and hanging new.We renovated a house some years ago where the former owner had a favourite chair in one corner of the living room where she sat and smoked.  

Inside the building look for the tell-tale weeping bubbles on the pipes.If you are going to be digging to the curb and replacing supply, the incremental for replacing waste will be small compared to returning in 3-5 (maybe 10 if you fortunate) years to dig again.Sometimes, if the pipe to the curb is not too bad, you can insert a sleeve through it ... basically put a synthetic pipe inside the cast iron.

I know chemicals are expensive for large pools that are well used or with debris getting in, trim branches yourself.my nickle's worth

Last suggestion is to find a couple chemical suppliers in the area and talk with the chemical reps.

How to keep a rental house with a toilet flooded , a higher curb than the floor , company does trust . this happens every year with tenant