It looks like Wolf Point - East Tower, the yellow tower crane plainly noticeable this morning from the ABC 7, Eyewitness News webcam (lower left corner of photo), will have a very pronounce and long lasting, line of sight, visual relationship with the observation deck at the Sears Tower (Willis Tower) as Wolf Point - East Tower partially fills in and nicely scaled, a long lasting architectural void in the near northwest region of the Loop.
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Collected from:
https://abc7chicago.com/weather/cams/loopscape/ - 20 Nov 2018
As a side note and analogous in nature to pilings and caissons in the ground, but relative to microscale meteorology of an orographic nature, the tall buildings in Chicago, being that they are tightly and uniformly placed on a near horizontal, thus planar surface of a laminar nature, in addition to generating urban thermal plume a.k.a. heat island, cloud formations (see photo at bottom) since the buildings radiate in a thermal sense like massive heat sinks, are also functioning like pier structures immersed in a low viscosity liquid - a.k.a. atmosphere, and from such, are routinely impeding the dispersal of suspended pollutants e.g. toxic gasses and aerosols (see photo below).
Collected from:
https://abc7chicago.com/weather/cams/itt_cap/ - 23 May 2018
Collected from:
https://abc7chicago.com/weather/cams/itt_cap/ - 30 May 2018
I am sharing such observations since every caring citizen and sincere developer in our nation a.k.a. "a good steward", should be acutely aware of and at all times, the macro scale ramifications of their architectural desires upon the environment to include the tenuous atmosphere.