FHFA uses the most current CBSA definitions and does not assign properties into prior delineations that might have been utilized during an earlier transaction year. As an example, a recent set of delineation changes is outlined in the 2018Q4 FHFA HPI report where a Technical Note explains the transition to new definitions which impacted multiple metropolitan statistical areas. The latest delineation bulletin only added a single micropolitan statistical area which is now incorporated into the CLLs process.
