Duplex Appraisal - Comps?

[Chad Trail]

I am in the process of having a duplex refinanced in Ft. Wayne, IN.  When I look online I see nearby duplexes that have sold at a price that would substantiate my value in the $180k-$200k range.  However, those duplexes were split into 2 separate condos and sold individually for $95k-$100k each.  I spoke to an appraiser and he said these are not eligible for use as comparable sales.  Is this true?  If not can you point me towards some official information that I can give to my appraiser?