I was wandering about Coerthas, near Monument Tower, when I spotted this on the horizon, at first I thought perhaps it would be Cape Westwind, but that seems quite unlikely seeing as there is a huge distance between Coerthas and Western Thanalan, not to mention, Cape Westwind was at sea level, unlike this base. Also, I don't recall this base being mentioned in the main questline. I wonder if it will become more prominent in the future, as it looks like it could be in Western Coerthas Highlands/Falcon's Nest.