I'm selling a lot of land that is build-able and part of the lot that the home I purchased is located on. Is there any way I can negotiate with a builder to see if he/she can demo the portion of the detached garage overlapping into the lot I'm selling (this is just a workshop that was added onto the garage & is hanging in the exact distance I need demo'd to be able to sell this) , while patching up the detached garage properly so it is still usable. 

I believe my question is, do I have to perform this demo in advance or is this negotiation possible? And if so, what stipulations or worries should I consider before following through with this? Also, is there a way to wrap this up in a nice "pretty" way to present to a builder?