I was not able to diagnose or remedy the problem on my own so I need to get a hvac guy.  

Were talking our "target" kind of property that has our attention with strong rent potential and minor changes to achieve much higher rent.Issue:While in inspection were discovering there is basically a rookie landlord with a bad lease agreement with bad terms and hot issue - a minor but mishandled mold remediation and all sums up to a really unhappy tenant.

I guess my question is: why are the liens being held hostage to remediation?

(and more)However, if they do, what is the remedy?

My oh my well that's not hard to remedy.

I have back out clauses, as well as a clause that says he agrees to give me access to the property and I am able to pursue all legal remedies because he does have to sell to me, but I don't think it is worth it.

My thought is by adding a HVAC system and providing air circulation that this would remedy the problem.Has anyone had experience with moisture issues in an all concrete structure?  

I live 40 miles away, so I called the owner of the biggest plumbing co in the city and he and 2 techs dropped everything to get to the property within 10 minutes of my call.I had put a garage outdoor access remote on the outside of the house.. they couldn't get in thru that because THE POWER WAS NOW OFF.Luckily i had put a coded door knob on the kitchen door that opens to the deck-- i gave them the code and they were inside instantly.The water heater was STILL SPEWING WATER full blast in a stream so strong it was hitting the second story ceiling and hitting the ELECTRICAL PANEL also located in the garage and that's what had knocked out the power .The plumbers immediately turned off the inside water main cutoffand sent me photos of the EMERGENCY SITUATION the pm so calmly let me know about by email an hour earlier.i fired the pm co that instant and got on the phone to STATE FARM (my HOMEOWNERS/rental policy dwelling ins co) all whiledriving an hour to the property.i also called the city's best WATER EMERGENCY REMEDIATION COMpany while en route.When i got there, the water was turned off ( finally)the drywall ceiling had fallen in, the light fixtures destroyed, the garage door opener plastic case was HALF FULL OF WATER and there were 1000s of mold blooms on every surface and hundreds of stacks of spiky growing black mold (looked like iron fiilings we used to play with in that game we all had as kids where u use a magnet and drag the iron filings around to put hair and a mustache on the bald guy cartoon photo) the mold spikes were 1.5" tall on the wood railings and stairs going into the house, on all of my beautiful built in wooden garage shelves--- what a mess-- like the streets of Beirut after the bombs went off.and I don't have allergies -- but i could not even STAND inside the garage because the WET MOLD MILDEW SMELL was so strong it instantly gagged me and gave me a headache and i couldn't breathe.So here we are on Jan 17 and now i know that the BEST rental dwelling policy does NOT COVER MOLD REMEDIATION AT ALL ( so far $14,000) but it does cover water damage with a $2500 deductible...

The house is actually in decent shape except for the roof and electric panel.So how much will it cost to remedy broken pipes? 

If the soil is contaminated it could cost considerably more than $5K to remedy this.