Do you mean this?
https:// en.wikipedia.org/wiki/Apostolic_Nunciature_to_the_United_States
Vatican Embassy
If those walls could talk?
It probably is really important in that Reagan recognizing the Vatican as more than a religious organization hooks them into international laws and regulations. I have a hunch POTUS will use this loophole when taking them down. Sanction them for criminality and seize all their assets?