Legacy At Millennium Park
Location: Chicago, IL
Built: 2009
Height: 820ft/250m
Floors: 72

7.25" Model Dimensions (1:1357 scale)-
Height: 7.25in/18.4cm
Length: 1.5in/3.8cm
Width: 1.5in/3.8cm

11.75" Model Dimensions (1:837 scale)-
Height: 11.75in/29.8cm
Length: 2.5in/6.4cm
Width: 2.5in/6.4cm

20" Model Dimensions (~1:500 scale)-
Height: 20in/50.8cm
Length: 4.25in/10.8cm
Width: 4in/10.2cm

Summary of Model Scales:
7.25in (0ft 7.3in)/18.4cm: (1:1357 scale)
11.75in (0ft 11.8in)/29.8cm: (1:837 scale)
20in (1ft 8in)/50.8cm: (~1:500 scale)

The pictures shown are of the 7.25 inch model.

The final picture shows the 7.25in, 11.75in, and 20in models.

Unedited 3D model credit-
https://www.thingiverse.com/thing:3351779