Does zoning increase the value of the land/property?

[Huy Truong]

Hope everyone is having a blessed Sunday. I have a potential deal where the owner is claiming that, because his residential property also sits on commercial zoning, that it should be worth more. Running comps, he is asking way too much for the property and is using that to justify his price. He is a highly motivated seller and needs to sell, but asked for me to see if that would affect the numbers. 

Thank you!