As far as I can tell, some time last night or this morning. Both Greenbrier and Kelly West are missing houses. I noticed them missing in Pokemon Go last night, along with an update to the streets that showed the pool as a body of water in Greenbrier and the road to the pool. I checked OpenStreetMap this morning and found them to be absent here. Perhaps they were never there to begin with, as the pool is absent aswell as far as I can see. Regardless, the buildings are missing. It is my understanding is Pokemon go uses OpenStreetMap for map data which leads me to believe the building were present at some point, as I have seen them there in Pokemon go up untill last night.