Layer Estimates:

Layer: Mailbox (ID:0)
Count: 0
Extent:

XMin: -20037507.0671618
YMin: -30240971.4583863
XMax: 20037507.0671618
YMax: 30240971.4583853
Spatial Reference: 102100 (3857)

Layer: Buildings (ID:1)
Count: 3316
Extent:

XMin: -13046642.666
YMin: 4035760.2156
XMax: -13042956.9221
YMax: 4037717.2806
Spatial Reference: 102100 (3857)