I didn't say which Higher Age GB's just making a statement and yes the Chateau would be a very nice one. So would the Dynamic Tower, Gaea Statue, Inno Tower, etc. My statement is when in lower ages go after the higher ages and not waste time on the lower ones except for certain lower ages like Zues, CDM, LOA, etc.
I am in LMA in one of my cities and I have the Inno, Chateau, ARC already down and in my inventory are the Cape, Dynamic Tower and Orangery with a couple of others. Right now I am focusing on getting all my boost ones up above level 10 then I will go after medals to lay down these buildings then I just might move up to CA.