Poser is definitely NOT the way to go here. I have created figures in Poser and exported them out to be read in AutoCAD files. I would recommend a couple of options. First, in general, for this type of work, particularly if you are using (or have) AutoCAD already, 3D Studio-Viz by Discreet (the same fine people who brought you 3D Studio Max): Viz is primarily an architectural building/rendering tool and comes with lots of architectural type textures. Another option is Accurender, put together by the folks who make Rhino. Accurender acts as (essentially) a plug-in that you activate directly within AutoCAD. Again, lots of architectural-type materials here too. Finally (for me anyway) Autodesk makes a program called Lightscape which is excellent at creating arcitectural renders and has quite an extensive library of various lights (e.g. sodium vapor/halogen... many listed by manufacturer and model)---but, to be honest, all my renders using Lightscape have been interiors (with PoserPeople imports)---so I don't know how well it does the outside, but head over to Autodesk.com for a look around. I know Viz and Lightscape can be purchased with student discounts making them fall into a more reasonable price range. Not sure about accurender.