How so? A headquarters is simply where most ideas/important topics are discussed in an organization. Although most are glass and modernized, they don't HAVE to be.For example, (The HQ for a basket weaving company.)When you look at it, you wouldn't see how it could be used as an HQ because the design seems silly, but it's still use-able.
I would love it, if you could make decent looking yachts in this game :/