Price per square foot calculation is a recipe for disaster When pricing residential real estate (as opposed to commercial real estate), unless a kind-for-kind condo, trying to compare two properties based on their price-per-square-foot calculation is a recipe for disaster. First off, I can think of 3 very important aspects to a property that are being ignored when you try to do this: The Location and Lot The location and land upon which the house is completely ignored in this calculation.