Property guidelines:Between 1300 - 2000 sqftPitched roof with substantial south facing surface area with minimal shadeSingle story All electricNow, outside of, reducing my carbon foot print,  local and federal tax credits do you see this as being a smart marketing tool to obtain and/or retain tenants?

On hard surface you might need to repeat...

No wastes, soaps, etc were found on the surface but again it was raining a lot prior to inspection.No info on water wells.

Aromas can permeate the surface and be hard to remove.

The on the surface negatives going in was where all the unrealized value was captured.

the mold remediation specialist is right. concrete does take years to cure, which can result in moisture on the surfaces of concrete. as such, any carpet on the concrete slab would eventually cause mold. however, you stated that the floor is tile, so, that would not be an issue. 65% is kind of high for humidity, and given the fact that they have too much stuff in the place, that gives the mold spores something to feed on. consequently, they are causing their own problem. since no one else had such a problem prior to them moving in, common sense says that they are the problem. i would offer them a buy out on their lease and send them packing

I would plan on exploring this from either Sheetrock wall on opposite side of opening up the wall from the tiled surface in the bathroom.You probably will not be able to keep the deposit in this case, and as you mentioned it was a 2 "flat" I am assuming you're in the greater Chicago metro and your L & T laws are very strict there.I would do as another post suggested and either have it repaired by current owner prior to closing to your satisfaction - meaning you are physically on the job site to witness extent of damage or lack there of due to water, or, renegotiate and ask for a concession for the issue - and this could be a moderately expensive problem depending on the length of time it has been leaking and given the possible location of the shower/bath to supporting wall etc should lumber need to be replaced.

:) The plastic blinds will likely be stained, particularly in the room(s) where they smoked most frequently.While folks will suggest to prime with a sealant primer (such as Zinnsser), if there have been long-term smokers, it may not be sufficient - it will cover in the short-term, but the toxins will eventually find their way to the surface again.We helped to renovate a house where the prior owner had been a heavy smoker for 30+ years.  

What I do, is try to look at the worst case scenario.And it's my opinion, that in the worst case scenario I can think of - where some tenant says their kid or dog got sick from eating soil on your property, I could argue in court that there would be no reasonable expectation for me to "assume" that the property was unsafe - given the fact that the city gave the okay, and I have the documentation to prove it.I would be quite happy with that risk.You can drive yourself crazy over this one, wondering if even if you test the surface soil and find nothing, that there may be some mystery leak buried down in the soil that may somehow rise to the surface, only to end up in the mouth of some dirt-eating child...  

New flooring, carpet, granite in the kitchen and new solid surface vanity tops in both baths, all new appliances, new paint, new carpet.