Urtho's Tower was located in the center of what is now the Dhorisha Plains. The Tower contained a number of meeting rooms, workshops and archives in addition to Urtho's living quarters. In fact, much of the Tower was filled with books and papers, many magically sealed. Much of this was taken out during the final evacuation of the Tower and ended up with Clan k'Leshya.
The remains of Urtho's workshops and weapons were discovered buried beneath the slab of rock by the mages who came seeking a way to protect themselves from a second Cataclysm heralded by the Mage Storms.