The continent had changed drastically since then, not only in landscape but also in power distribution. Some powers fell, some rose, and with that movement, ownership of places and even layouts changed along with it.
Case in point was the Order itself. Its main headquarters was built on what had been one of the grounds owned by the holy land, the Myriad Beast Sect. It was actually the only land they owned that had been largely left intact, owing to the fact that it had been the manure grounds for their spirit beasts, which not many organizations felt any desperate desire to grab hold of, despite it housing a mature dragon spiritual vein.
As for their other grounds, which cultivators would have no qualms trading their ancestors for and risking their lives for, especially the main grounds, they were literally carved up and dug out from the ground.
