Too Creative?

[Craig Willard]

I am looking at a foreclosure on multiple duplexes, they are asking 150k each.  I really want to buy several of them but don't have the necessary cash on hand to put 20% down.  I do have enough to by 2 however I would like more.  I am pretty confident that I can get the units for about 115K each, they could use some work however all are rented.  Is it possible to ask the seller to make the purchase price 150K however agree to 115k essentially dropping below 80% of the sale price and not requiring me to pay the 20%.  Thoughts? Is this legal?