[LouisVanDerWright]

^^^ There's also as much space as is contained in those two office towers currently under construction in the Post Office which is also between the freeway and the river...

What a silly question anyhow, as if people build skyscrapers places because that's the aesthetically pleasing place to put them in the skyline. Here's a hint: they ain't building shit over by the freeway until all the super desirable sites that are along the river or right on top of the train station are filled up. Why? Because what tenant is going to be like "yes, I'd like to anchor this tower that's 3 blocks further from the train stations, not on the river, and much further from the loop and L because the skyline needs to see more office towers on these vacant lots"... No, they are going to go into the trophy tower with permanent river views every. single. time.