Layer Estimates:

Layer: Zipcode Boundaries (ID:0)
Count: 61
Extent:

XMin: -9789448.72094503
YMin: 5107881.55260611
XMax: -9743142.37458734
YMax: 5164431.137547
Spatial Reference: 102100 (3857)

Layer: Chicago Boundaries (ID:1)
Count: 1
Extent:

XMin: -9789448.72
YMin: 5107881.5524
XMax: -9743142.3745
YMax: 5164431.1375
Spatial Reference: 102100 (3857)