3 way wholesale / double assignment

[Terry Royce]

I've read about doing a 3 way wholesale / double assignment but never done one.

I have the seller (A) , the original buyer (b) who assigns to me (C) and I assign it to the end buyer (D).

Whats the best way to structure this A-> B -> C-> D
so that it is all legitimate?

We are not going to double close the property. Not enough room in the deal.

Thanks