Jewelers Building/35 East Wacker
Location: Chicago, IL
Built: 1927
Height: 523ft/159m
Floors: 40

6.25" Model Dimensions (1:1000 scale)-
Height: 6.25in/15.9cm
Length: 2in/5.1cm
Width: 1.75in/4.4cm

8.25" Model Dimensions (1:750 scale)-
Height: 8.25in/21.0cm
Length: 2.5in/6.4cm
Width: 2.25in/5.7cm

12.5" Model Dimensions (1:500 scale)-
Height: 12.5in/31.8cm
Length: 4in/10.2cm
Width: 3.5in/8.9cm

18" Model Dimensions (1:350 scale)-
Height: 18in/45.7cm
Length: 5.5in/14.0cm
Width: 5in/12.7cm

Summary of Model Scales:
6.25in (0ft 6.3in)/15.9cm: (1:1000 scale)
8.25in (0ft 8.3in)/21.0cm: (1:750 scale)
12.5in (1ft 0.5in)/31.8cm: (1:500 scale)
18in (1ft 6in)/45.7cm: (1:350 scale)

The pictures shown are of the 6.25 inch model.

The second picture shows the 6.25in, 8.25in, 12.5in, and 18in models.

The larger sizes have slightly more detail.