How much value does permaculture landscaping add?

[Jaci Ampulski]

I've got some plots of land on the big island Hawaii near Pahoa. The area is relatively low income and food sovereignty is a big deal - both because financially food on the island is very expensive to import and because if anything were to happen to the harbors, the people would be reliant on their land and their neighbors for any sustenance. 

My business partner has a wide breadth of experience evaluating land for farming, and creating permaculture and edible landscapes. Growing Victory Gardens for people who don't know how to get started. 

I'm curious if anyone here has much experience with what those value adds of edible landscaping are worth in terms of money/land appraisal and what people are willing to pay?

Thank you so much!