After receiving the call from HOA, I called the tenant and explained to him about HOA and how to remedy the situation.  

Hi BP,I'm looking at a HUD property with BURIED OIL TANK and may also need MOLD Remediation in the garage and another room.My bigger concern is potential Oil tank leaks and soil remediation that can run thousands of $s.

Finally, SB 1994 gives a homeowner several remedies if a wrap lender violates the law, including the remedies in the Texas Deceptive Trade Practices Act.From the Texas Senate:"Senate Research CenterS.B. 199485R6359 CLG-FBy: Zaffirini et al.Business & Commerce4/11/2017As FiledAUTHOR'S / SPONSOR'S STATEMENT OF INTENTRecent years have seen a spike in the prevalence of a particularly insidious category of mortgage fraud involving so-called "wrap" financing, in which a seller finances the sale of a residential property that already is subject to an outstanding lien, often without notifying the buyer of the senior lien, or the existing lienholder of the sale.

Also, the correct term is lien (as encumbrance)  not "lean" as in rest upon or thin, gaunt or sinewy.My guess is that you're drawn to this property because it is there in front of you and you're frustrated because no one else has taken substantive active to remedy the long list of problems. 

If the company finds something, at least you'll have a path to remediation.

For example, if you were suing on mold that you discovered in the property, you should get a real estate attorney and have him or her prepare an affidavit that a mold remediation expert can put forward about the damages the mold caused in the property and why the previous owner knew, should have known or was deliberately unaware of the mold to your detriment.My state also allows attorneys fees on improper disclosure, meaning you can go really hard on these sorts of actions if you're going to recover, because the attorney can get paid $10,000 of attorneys' fees even if your recovery is only $4,000, for example. 

There might have been a column at downstairs unit which was removed at some point, we couldn't tell.So, my question is what would I need to do to remedy this situation ?

Yes, most things can be done virtually, but there’s something to be said about having boots on the ground to identify opportunities or remedy a dilemma.

It seems like grants for lead paint remediation would be super useful, but I wouldn't be surprised if it was for primary-residents only.  

I find that if I don't like something that I can just mention that I will need to call housing and report the problem and the tenant remedies the problem asap I assume because they don't want to lose their vouchers?