I am assuming that you're referring to some sort of calculation in which you use the fair market value of their interests and feed into some sort of discount or premium to derive an exit value.

Tyler, they bought the mortgage at a discount. 

I'm not suggesting anyone works for free, but there are mutually beneficial discounts that are to be expected.Best wishes all. 

Also, the question of what discount rate to use is important.

If you buy these properties you can buy them without title insurance (presumably at a deep discount) which I would not recommend except for extremely knowledgable and experienced investors.If you're willing to buy the properties with title defects and cure the defects, go purchase at the tax sale yourself and cut out the middle man.

I do not give a discount.

Before then, enjoy the tax discount.

Once it hits that two month period, then I start to consider it for a notable discount - especially in the winter.In addition, I also want to use any previous contracts that have fallen through and adjust my offer accordingly.

They are basically just showing the property until they are forced out.Typically, shortsales are listed at a slight discount to the market value to attract buyers.

If they have a lot of vacancies now you won’t get a huge discount for that.