I read a fiction series in 2006 while I was pregnant with my daughter. The author was male.  It seems there were at least 9 books in the series…maybe as many as 15.  I checked them out in hard cover from the public library in Boise Idaho.

I remember the series beginning in a land where Vampire masters harvest from herds of worker slave humans.  Humans are basically chattel to the masters.  The masters transform the bodies of live slaves into buildings. The stuff of body parts are re-purposed for architectural functions…..tall, complex buildings where slave lungs and hearts are pumping water and fresh air throughout the layers of the buildings.

The vampires called their homes “eyries” like eagle nests.  Tall buildings.

The series moved forward being quite political as Vampire masters battled amongst themselves to destroy each other.  Alliances, betrayals, etc…

As the story developed, it turns out that the vampire land is an alternate plane of Earth. Some characters from modern Earth cross over, get themselves into trouble, then return to Earth.  Eventually, guns get introduced to the vampire kingdom.   During the final (?) book, a battle is happening between a handful of characters and Nazi soldiers who are jumping back and forth across the dimensions.  Absolutely crazy stuff…

I realize this isn’t a whole lot to go by.  Thank you for any help you can provide. My brain has residue of the images of the breathing, living buildings. Amazingly creepy and awe inspiring.