Architecture is the art of how to waste space.
Architecture is art, nothing else.
Architecture is basically the design of interiors, the art of organizing interior space.
How does an artist know when the line that he just painted is good or not good? That's the catch. De Kooning was the greatest of my contemporaries in art, and he knew when he'd done a good line. When he didn't, he threw it away. I wish I'd thrown away some of mine.
When a building is as good as that one, f#*@ the art.
I wouldn't build a building if it wasn't of interest to me as a potential work of art. Why should I?