There’s also a taller, newer grain silo behind it. A good way to gauge the height of the buildings in Guinness is by knowing that the Storehouse is 35M tall without its Gravity bar hat and about 42M with it. The rest of the buildings look about Central Bank/O’Connell Bridge House height, around 45M.
If you read about the Heuston Gateway on http://www.reflectingcity.com you can see plans for the area’s future. The first of those three tall buildings is a 19 storey apartment building on Military Road currently in planning.