Over the summer I spent a few months working at Virtual Planit (http://virtual-planit.com/) working on real time arch-vis projects. They're an awesome team of guys, and I really recommend you check our their portfolio of work, because the standards they hold themselves too are the highest - and their amazing work shows that!
The architecturally accurate models are all provided by Virtual Planit (http://virtual-planit.com/), while bringing everything into engine, texturing, lighting, particles and other effects was done by me.
My job was to take their own awesome non-realtime projects and try to convert them into a real time form. I worked on a few projects, but the main one was converting their redeveloped Anfield stadium into UE4, which I did over the course of about a month.