How to run comps with no comparable sales in same area

[Keri Dichiara]

I have come across a few properties that did not have any similar homes sold in the same area (same beds, baths, sq feet, etc). How do I figure out what the ballpark ARV would be if i have nothing substantial to compare it to? I know I could ask a realtor and I am working with one who could provide that info, but I'm curious what information would those comps be based off of?