Interesting development. Perhaps there was a sinkhole under the building after all? A large hole has been dug near the back left part of the site, and it appears there's some kind of bracing in there now. Plus some kind of coring or drilling machine is parked near the perimeter road.

To all extent, Horizons is now gone. I'm not sure if I'll continue updates, since the purpose, documenting the destruction of Horizons, is now done. It's been tragic.