It actually doesn't look like it has a tint on it all. It looks to be highly reflective, as it's reflecting the building across the street from it pretty accurately. So if it's overcast out, and you're standing on the ground and looking up at the glass, it'll look grey. When it's clear out and reflecting the sky, it'll look blue.
Same as Trump.
"Then each time Fleetwood would be not so much overcome by remorse as bedazzled at having been shown the secret backlands of wealth, and how sooner or later it depended on some act of murder, seldom limited to once."
Against the Day, Thomas Pynchon