Layer Estimates:

Layer: Piers (ID:0)
Count: 9
Extent:

XMin: -10767908.0488856
YMin: 3870860.07106113
XMax: -10766584.8366169
YMax: 3875424.00923656
Spatial Reference: 102100 (3857)

Layer: Historical_Marker (ID:1)
Count: 2
Extent:

XMin: -10767295.2173501
YMin: 3870735.90644042
XMax: -10766273.5303313
YMax: 3872887.63921985
Spatial Reference: 102100 (3857)