Looking good. Only thing for me is 'weathering'..is that what it's called? It's just that some of the concrete (the walls on the ground floor and the 2 pillars that go up the front of the whole building) seem too clean. I'm thinking add stain from rain, sun damage/cracks...stuff like that. And you could tweak the diffuse…
Yeah if you just use a grayscale diffuse and emissive textures for your light and then multiply them by a vertex color which you assign on the faces of the lights, you could use the same texture/UV space and get what you want. Scene's coming along. I personally would like to see a little more directional moonlight…