Splitting land while under contract?

[Mitchell Billman]

I acquired a property under contract with a second lot in the back.  The owner of the backyard home behind that lot has shown interest in purchasing part of that extension.
Is there any way to do the following basically at one time?  To split off that piece of the land to the new owner and assign the remaining property and home to someone else via wholesale assignment?
Now let me say it is a double lot. We would not be leaving the remaining home with no backyard etc.  It is just all trees now and unusable unless someone wants to clear it out, which the neighbor wants to do. 

Is there a creative solution to close and fund the whole deal, then maybe in the 48 hour period, annex the land and sell to the new neighbor and then close with the wholesaler for the house?

Thanks