Transformed single family to four-plex appraisal help!

[Sean Gribbons]

HI BP,

I'm currently trying to price a single family home that has been transformed into four units. The property generates income and has receipts from past years to prove this. How would an appraiser go to appraising this? All local comps are way smaller and single family non income properties. These properties all have around the same PSF but this property is in a substantially higher price point for the area. Hope someone can help thanks!