mt Idea wouldn't work now that I see what you are doing.
Since you have illustrator why not set up 3-4 buildings then copy paste them til you have all the buildings you want, then copy them into PS. That seems like it would be the easiest way.
You can even take your PS file into illustrator as a template and place all the buildings in illustrator, then copy all the buildings into PS at once and do any last minute tweaking.