How does FHFA handle previous versions of CBSA definitions?

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.