If it is Fannie, here is their guidelines-If the subject property is located in a new (or recently converted) condo project, subdivision, or PUD, it must be compared to other properties in the same market area and to properties within the subject condo project, subdivision, or PUD. This comparison should help demonstrate market acceptance of new developments and the properties within them. Generally, a subdivision is considered new when there are limited or no resales or the builder or developer is involved in the marketing or sale of the properties. See
B4-2.1-01, General Information on Project Standards and
B4-2.3-01, Eligibility Requirements for Units in PUD Projects for the definition of a new condo project or PUD.
I would say that if the subject is not in a new subdivision, then it is an infill lot and you can show acceptance with either/or sales within the subject subdivision and at least one other infill property, it does not have to be new, it just has to show market acceptance for a new home in an established neighborhood. The others seem to be referencing when the subject is a new home in a new subdivision/project. They are two different things.