Blender Guru Released an architect scenes addon a ton of time ago, in order to help guys, who are not that good in modeling and materials, but want to be able to make good scenes again. Tried it. Here's what I got. Render time: 1h 47min.
Thunder , if you are interested in this too, here's the link:
First of all, upload them to Dropbox.(If you don't have an account... well... just register!) Next, choose the share option "share". It will show a link like this:"https://www.dropbox.com/s/listswc897rhb62/city%20hd.png?dl=0". What you have to do now, is to change "www.dropbox.com" to dl.dropboxusercontent.com and delete the last ?dl=0.
Disclaimer: Do not use the example link. It is a link to an image I have already posted. No copyright infringement.