Layer Estimates:

Layer: PA Counties (ID:11)
Count: 67
Extent:

XMin: -8963376.9459
YMin: 4825316.2222
XMax: -8314403.8624
YMax: 5201412.5181
Spatial Reference: 102100 (3857)

Layer: 2021 Percent Buildings Built Pre-1950 by Census Tract (ID:19)
Count: 3446
Extent:

XMin: -8963429.21780825
YMin: 4825308.51900714
XMax: -8314404.07693089
YMax: 5238602.0584667
Spatial Reference: 102100 (3857)