Appraisal on a 4-plex when there are little to no COMPS

[Jonathan Pflueger]

I am refinancing a 4-plex, in a small town, right outside of the San Francisco, Bay Area. The nearest comparable is within 3 miles but it last sold in 2018. The next closest comparable is 8 miles away and in a very different demographic/price range of properties (properties are significantly more expensive). 

When there are few comparables, are their other methods an appraiser will use when estimating value? Would they use an income approach?

Thanks!