Guild Halls are places where your guild members can meet to "hang out" and chat, but with they are also highly useful spaces. For example, the right amenities the space can be used to repair your gear, do your banking, craft items, travel to other zones, and much more. Halls are a huge, shared status item. Guild Halls are found in a number of locations. There is no restriction against a good-aligned guild leader buying an "evil" guild hall, or an evil-aligned buying a "good" guild hall.