Thanks for the reply, Ken.
I've been using Maxwell Render. I like how the settings act similar to a camera setup.
The one is quite grainy indeed. I didn't give it as much render time as I should've liked. I needed my main rendering machine for other tasks at the end of that weekend. My rendering setup isn't that complex. I've got a mac mini with a quad i7 and 16GB of ram.
The larger, less grainy render took all of a weekend to get to the point it is. There were a lot of specular reflections from the light fixtures at the ceiling, and the "EXIT" signs added a lot of time, too, with the SSS material.
TK2