That's exactly what I'm trying to avoid while still attempting to use vinyl flooring.This wasn't an issue when they built the house in that the floors were wood, and they breathed...no different than the first line item in building code exceptions §1203.4.2 which states "where warranted by climatic conditions, ventilation openings to the outdoors are not required if ventilation openings to the interior are provided"....but we aren't talking about code here, we're talking about solutions to an existing problem without spending a ton of money.

If I don't consider them, how will these other items be funded?

.- Paint - Repair - plumbingWho does the below 4 items?

Shopping for REI properties is not like going to the bigbox stores and picking items off the shelf. 

@Nicholas Catania I think @Steve Bracero gave some good answers.There are essentially three big picture items you're looking to find out about any investment prospect before digging further...1> Do the numbers work for you?

I'd look for the big ticket items first.. how's the roof, siding  or do you have to install a new HVAC?    

Couple of unexpected items were 29 pressed piers, electrical panel upgrade and new AC. 

@Sam Leon Michael Seeker You can usually get a builders risk endorsement to your policy to cover items in your rehab not attached to the house yet.

From basic office space, to installation of specialty items for their practice.

Sometimes a quote from one contractor may be a bit higher, but it takes into account items that require foresight.