And second - for whole portfolio he should offer very good discount.

In 2015, banks are getting market value and have very little motivation to deeply discount their REOs.You really don't want houses AFTER foreclosure (that's the problem you've seen here).  

Don't build the fence and risk losing the historic home property discount.

I personally like to make three offers...1 - cash with a major discount2 - seller financed with a big down payment and a reasonable discount.3 - seller financing or taking over the note with nothing down, with a small discount (possibly none at all if it will cash-flow).If they want option 1 - the discount is large enough that securing private money will not be a problem.

I won a bid on a property on HUD at 69% discount at $70k, the Market value is $110k, and MLS has it for $105k the property needs about $5k in rehab just light work.

That is longer than you said, but they also have a trading exchange where you can buy out someone's portion at a discount/premium

We intend to make initial purchases with cash as we assume the deals will move faster and we can probably get a slightly bigger discount on asking price if we propose an all cash deal.  

., I would imagine that a bulk discount would be available, but if they are working fine right now, why replace them?

Other deals that may not be discounted, but make a great or smart investment at a fair price, I would borrow cash.

Investors who buy distressed 2nd liens look for notes where the borrower is paying the first lien because these are more likely to get a workout, so selling this note is a good possibility, but understand that these trade at extreme discounts so you would likely only get a small percentage of what you are owed.