The areas where you have so much space in the center of a ring of houses seem odd. I mean, essentially every city or town or village has some kind of restriction on how far it expands outward. In a fantasy world, one might think of marauding orcish war-bands and various bandits as an excellent reason to keep your community together. Outlying settlements are hard to defend, and the larger your town is the more vulnerabilities you have. The larger your town, the more difficult it is to transport goods and so forth.
What I'm trying to get at here is that I don't think there's a particularly compelling reason why you'd have so much empty space there. If the town doesn't need to have buildings there then I'd think the town would be smaller.