TD occupies at least 4 floors of this tower already - for at least 10 years - and I'm positive they've had two of them for 30.Two thoughts - on the level of protection of the former Seagram Building in New York, see the brouhaha over the removal of the Picasso from the lobby earlier this year.
On the sign itself - is it an indication that TD will be taking the E&Y space when they move to their new building, and possibly leaving the Canada Trust tower, thus consolidating their offices in the TD Centre? I don't know if TD has any space in the E&Y building now.
As for Alklay's comment about embarrassing CF. It's not CF that needs to be embarrassed, they were just fulfilling a major tenant's request. It's TD that should be shamed into removing this.