Mavis Avenue is an old property: apparently the original mansion doesn't have foundations (according to Mark Allaway?) and the "modern" cream brick extensions were just-do in the 1970s and have some serious issues today. The nuns sold it for many strategic reasons that were a long-time coming for them in the 80s. As we add on another 40 years, those issues are ours to confront anew. They haven't gone away over those 40 years, only compounded.