I think if you read the caption on the quilt, the name of the quilt is "Chateau" followed by the dimensions of the quilt, not "Chateau Dimensions". Looks like it was designed for a timeless treasures fabric line of the same name. I couldn't find the pattern, but the designer, Toby Lischko has a website. Her contact info is at the bottom of this page:
http://www.gatewayquiltsnstuff.com/moresites.aspx
If no one else can find the pattern, I'd contact her directly.