How to analyze a deal in Hawaii zoned Ag with 2 rental units on it?

[Kahanu Noa]

Hey BP,

Thanks for reading my post!  I am looking at a few properties on Maui, Hawaii but am not sure how to analyze based on comps.  One particular property is zoned Agriculture with almost 4 acres of land and has two income producing 2 bd, 1 bath cottages in need of some repairs but habitable.  When I try to run comps in the area, the two things that never seem to match evenly are:

1) the land size (too small/ big) 

2) Age of the home (too old or recently built in the past 10 years)

How do you estimate or analyze a similar property?  

Are there any blogs, posts or other resources on bigger pockets that other investors can recommend?