Seems like maybe you have some issues with moisture getting into the building.  

High moisture levels originating in kitchen and bath combined with a tight house is causing condensation to form on the cold wall.

Tenant will notify Landlord in a timely manner of any damages or problems as they arise, including damages caused by Tenant, malfunction of appliances or fixtures, and water/moisture leaks and spots.

Other materials like steel studs not so much and there is drywall made without paper that is mold resistant.Mold is everywhere and is often in a dormant state but will need moisture, darkness, and certain conditions to grow.You need to look for the conditions that prompted the mold growth and correct those conditions also.    

The moisture from the carpet cleaning gets under the carpet tack strips along the edge of the room - where the baseboards are - and the moisture could lead to the mold becoming established there.

In all of our properties, when mold appeared it was because the tenant had not called us about a water leak, or created too much moisture and didn't use the ventilation fans as they should have, or did not use the heating system properly, or kept an unclean home. 

I need slightly urgent advice.I placed an offer on a house last week, and now I've had the inspector in as well as one of several contractors to get estimate for needed stuff.I got a great price on the offer I think, the inspector is also a structural engineer and he said he thought it was a great investment property.Issues include:-mold-basement moisture-main roof OK, but some patches needed-front porch roof & detached garage need replacing-boiler bearning bad-radon (4.6)That's all before interior fixes like plaster (from all the roof leaks), new carpets and interior painting.This is my first deal, and while I'm not afraid of all the work involved, The estimates are getting close to my bottom line number.I'm starting to get nervous that the rehab costs will make this unworkable...and I really want it to work.I have been an excel spreadsheet (Property Analysis Buy & Hold) and have plugged in a LOT of numbers, including a rehab number up to 40,000...and the property still gives me a 5% Cash on Cash return, which isn't bad, and a cash flow of anywhere from $100/month for lowball rents to up to $1000+ cash flow for top number rents inline with the area for a nice place.The advice I'm looking for is how to figure my bottom line offer.

any moisture / mold issues down there? 

Watch out for moisture as well as having them heat and cooled.

The building inspection uncovered that the new house foundation is just sitting on top of the old one without any stabilizing measures.The crawlspace was largely inaccessible to the inspectors, but what they saw was mold/moisture issues.