You can also have your folks deed 1/4th interest to each child prior to the refinancing and your income MAY be used to qualify, tell the new lender this is for estate planning purposes and you MAY go on the note with your parents, ask your bank. 

Super liens might be child support, taxes, labor liens, court orders as judicial liens under state law can take priority over liens made voluntarily, like mortgage liens. 

Water will eventually destroy the footings and upset the concrete floor itself.

It may further be advantages (for tax and control purposes) to have the U.S.A. company be a 100% owned child of a Canadian private corporation.   ... as stated at the top of the paragraph, find yourselves a good accountant and attorney who are cross-boarder real estate experienced.

Department of Treasury with usc exceptionState Tax LienLien by USA or Dept of JusticeUS Department of StateOther Federal AgenciesFrequent Superior Foreclosure-Liens:Code Enforcement for debris removal or mowingDemolition or Environmental Based Liens State child support lienBoard of County Commissioners for special assessmentsUtility LiensWater/Sewer Delinquency (only in selected states)County (and/or School/Township) for unpaid taxesCity for road improvements, maintenance

40-800/square foot.

But when you have outside marketing agencies selling to folks that have no clue and they get big dollar signs and make huge mark ups and never even set foot there .. well you get what you get a poor NZ investor who probably has lost ALL his money probably paid 2 to 3X what the property was really worth to a local and is pissed..and I don't blame them.

As for other expenses, i footed the bill for imutilities until I got it rented and now just minor repairs.

Unfortunately, most banks won't want to touch this with a 10 foot pole.  

So tear it all out and start over with fresh drywall.A 10x10x8 foot kitchen will take about 10 sheets of drywall @ $12 each (use the 5/8" in rentals... it's sturdier).