Diggy implemented brick limits to lots quite a long time ago so he could have a large city.
I haven't been back there in a while, but the new city is pretty bad in comparison to the old one. Myself and a lot of his other admins encouraged him to make a new city layout, but the new one is far too small.
Last time I was there, five people owned 90% of the city, and the rest was all WIP lots or things misaligned so that nobody could build beside them.