I followed Adrew Price tutorial on Blender Guru http://www.blenderguru.com/videos/high-rise-building rendered in BI. Now I have turned it into Cycles rendering engine, all materials, lights, low poly lamps inside, are Cycles. Array modifier still in place so you can make the building higher, but you will need to move roof with "elevator building". Materials clearly named. World has sky texture. Fa:100436,
Ve:123170. Thank you!
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Thanks this will save me lots of time.