Mythruna

So I was looking through the Mythruna gallery on Mythruna.com, and I saw a town that had about 3+ properties, and the farthest and tallest tower resembled in my mind as one of those skyscrapers you see with big glowing beams on the top.
(http://i.imgur.com/2LWwzYy.jpg)
Maybe Mythruna builders could do this with properties

That is quite epic! Don't forget the modders ;)
or mix them both builders and modders :o

Or maybe even with Paul's earlier mentioned mechanism system:
...people could make lights that extend past one block up. Modders could make that also.

That (Which I actually like better than:) or you could just make those walls at the top out of colored-light blocks.

a mod that has naturally spawning npc cities with buildings like that would be awesome  :D

The building templates for NPC buildings will be 100% pluggable... so assuming the building is possible at all then getting it converted to a mod for cities will be pretty straight forward.