It must've been a copy-paste error on my side. They have quite a few upgrades planed.

The new sport hall is in a document from 2019 (https://nag.sofia.bg/RegisterVisasOfProection/Info/?url=6j3B_nn_3rw=). It's likely expired but it's renewal is trivial.

The other document is for a 3 story building between the two main buildings: https://nag.sofia.bg/RegisterVisasOfProection/Info/?url=bmk2gPjVRBI=