Hey Scott,
I think it's a cool concept but the thing is that RED is already short for real estate design, so to go with a CR which is essentially short for Cogent RED, is kind of like an abbreviation for an abbreviation and would miss the main point of RED :/ Of these, stylistically I like 62 and 64 the best if that helps. Sorry to get back to you so late this evening. I appreciate your attempts thus far