ESL: Comparatives: tall -> taller

Which building is taller, the one on the left or the one on the right?

The one on the right is taller.

The one on the left is the TD Centre, owned by the Toronto-Dominion Bank. It's 54 stories high.

The one on the right is First Canadian Place, owned by the Bank of Montreal (BMO). It's the tallest building in Toronto at 62 stories high.