I love the details in the tilework. This natural Tago sandstone accent wall has such a beautiful texture.
Of course there are economic pressures. This is a low-rise building in a very high-rent area. A high-rise would be substantially more profitable. But one can't ignore the magnificent design and details that would be lost. For example, the South Wing was added in the 1973 with this remarkable mosaic painting by Yoshiro Taniguchi based on the print "Saginawate-no-Saku" by Shimo Munakata.
Some more details, I love the textures!
Sources: Monocle, Town & Country and Hotel Okura