Regarding to some sources (Markkinointi & Mainonta) second Starbucks should be opened at Akateeminen Kirjakauppa which is part of Stockmann Group. Biggest Akateeminen is located on the corner of Pohjois-Esplanadi and Keskuskatu. There are already two cafes in book store but Starbucks might change the situation.
https://reijosfood.com/2012/05/23/starbucks-has-opened-in-finland/
Reijosfood 