There's a lot of things that aren't around anymore. Not just businesses such as G/M Steakhouse and Sound Exchange, but actual buildings where things were; the factory where I worked, the house where I ran into Gil Wilson at that party (listen to the two "Blind Assassin" songs on my MySpace page for references to Gil).
I found quite a few of the houses where things took place. For some houses I just snapped one in the neighborhood that looked close enough. I also snapped a lot of intersections because all the light poles and signs and other urban detritus are hard to recall from memory.
The current book is coming along fine. I should finish it in early to mid February. It is not an after thought at all. I'm at the critical stage where I am trying to make good finished drawings. I just finished page 28.