Summary: The House that (your character here) built
Comment: McFarland and company put together an excellent source for establishing domains in the DA line. The entire line is represented here, with special consideration given to Mages, Inquisitors (Holy Ground covered as well), Were Wolves, as well as the staple: Vampires (Cainites).
You will want to sit down with your group looking over this book, as major thought is put into establishing group domains. As a GM, I was pleased to see this encouragement on group play.
Don't make the mistake of thinking that this is just a GM book though, I have found much in it to enhance the play of my own characters, and would recommend it to anyone who wants to see some realism breathed into their Backgrounds.