This is a very old tutorial I recorded back in Cinema 4D Release 9.6 (it was entitled "Modelling Architecture in Cinema 4D").
I took it offline a long time ago as it was outdated and not very useful anymore. I still keep getting requests for it occasionally though, which is why I have decided to re-upload it again. Sending people video files or temporarily uploading them to some file hoster was a bit of a pain. Anyone who has lost their downloads from back then or wants to revisit the tutorial can do so now. You can find the videos on Vimeo and YouTube.