here's an example of where the windows get wider and the columns narrower in a reinforced concrete frame building: one logan square in philadelphia. in this case, there are no recesses in the concrete to accommodate equal sized windows. the architect (KPF) wanted to reveal the structure.
actually, i think this and 333 wacker are two of KPF's purest, simplest and best designs from the 80s - 90s.
http://fineartamerica.com/images-med...an-pearson.jpg