I reverse engineered what I could, and it's supposed to be all in row 30, column 4 to 11 (8 squares). You may add 2 more squares on the left or right side (it's just checking it's no more than 10 squares).

It's the third row where other buildings show up.

https://i.redd.it/rwudh4r46eqf1.png

I'm glad that the programmer put some tolerance to it, but it was impossible for me to know whether he did or not at the time, and that was the end of fun for me :)