Lee - thanks for the comments. You are right, I did a lot of cutting (table saw) for the boiler house. To make the building square careful attention to panel widths is needed.
Ken - I buy LED strips from Ebay - Hkesupplier in Hong Kong though they sell in bulk 300/500 LEDS. I believe $4 gets you 300 LEDs and I was not charged shipping.
To all - I screwed up on the apartment building. It is not OGR. This was scratched built from styrene panels.
Joe