5000 sf house built in early 1900's with a carriage house apartment in the back yard. The main house has been turned into 4 units, 2 above grade, 2 below. Is this a 5 unit, or a 4 unit with an accessory unit. I have nothing to do with this assignment, just overheard a conversation between two appraisers and a Realtor. Ironically, both appraisers made good arguments. My first opinion ws that it was a 5 unit, however, listening, I am tempted to think it is a 4 w/ accessory unit. Of course I know why it makes a difference, neither of them were CG's, but am curious as to other opinions.