This thread is quite old, but I think that the info is still valid:

http://flyertalk.com/forum/showthread.php?t=138318

And here is a newer thread:

http://flyertalk.com/forum/showthread.php?t=388491

I stayed at the Ren 18 months ago, and was upgraded to a suite. This property has enough suites that mid tier members sometimes get this upgrade as well. I was well content with the hotel.