I don't know where the repeaters are in the building, what they look like, who makes them, or anything other than they work for Sprint, Verizon, and AT&T. I get a consistent -90dBMish EV-DO signal inside.
I work in an EMI Proof building. It's basically a giant Farraday cage. As soon as you walk in the door, the cell coverage drops out. Some years ago, before LTE was a thing, they installed cell repeaters. Would these older repeaters be able to pass LTE, or will I be stuck on EV-DO at work?