Wow does this bring back memories. My mom worked in PR for the Prince Hotel in the mid-70s; I got to see the Japanese suite and we ate at the Katsura on the regular. I can't believe it's still there.
Actually I don't think that building's THAT bad-looking; I don't know when it was built, but it kind of has a 50s elegance to it. There's a ton of much uglier buildings that I'd take down first.
Now that I look at the rendering again, the diagonals are quite a bit more slender than the supercolumns, so I guess the steelwork in place is in fact permanent.
I saw those as well. I'm no structural engineer, but those look way too small to be the final diagonals. Will they be adding to what's in place already, or are those temporary?