The target in the Nashville attack

[Klaralven]

12. The building attacked is not the AT&T Batman building.

The building sits on 2.7 acres (11,000 m2) of property on Commerce St between 3rd and 4th Avenues North, and has a footprint of ​1 2?3 city blocks.

https://en.wikipedia.org/wiki/AT%26T_Building_(Nashville)

The Batman building is essentially an office building, and, as such, not a particularly interesting target.

The buildings targeted are two buildings on 2nd avenue between 2nd and 3rd avenues, which are buildings housing telecom equipment. These buildings probably do not have staff other than technicians needed to do installation, change and maintenance jobs on the equipment.