This is probably going to be a very obvious thing, but I can't seem to figure it out. I'm attempting to build a 7x7 skyscraper for my faction. There is plenty of room for one, 2 sides clear, and I'm standing in the corner. I have the necessary privs, given the fact that I have build taverns and offices, ect on the same slab.

Everything works fine except the drop down list is not displaying anything larger than 5x5. I lists the 1x1, 1x3, the walls, 3x3, 3x5, and 5x5 in that order. And that's it. There is no 7x7 subsection.

Link to screen I took

What am I doing wrong? I've tried in both browsers and this isn't the first time I've built skyscrapers. Is this a bug or am I just dumb?

You can't build facilities larger than 5x5 on glacier terrain.

The "Faciltiy Construction" rules page would have answered your question.

This is the rules page Ralgarrch was so helpfully directing you to.

EDIT: Correcting a word.