"Historically, we've always had three comparables on an appraisal," Metzler explains. "Today, you see four or five a lot. But when you're doing (a loan for a property) in an association, you have to pull the majority of the comps out of that same project."That means the appraiser will have to use at least two or three comps in your complex to determine the value of your condo, even if other similar condos sold for higher prices nearby. If no useable comps exist in your complex, the appraiser will have to justify why other comps were used.