I did it for each street address number. Definitely an overkill but it only took a night or two (didn't check) so I didn't bother to optimize. :)

Unfortunately not. I created it with various programs I've written for my data visualisation videos (https://www.youtube.com/user/laurivanhala )

Very nice! Are you importing transit data into a 3D renderer, or did you write the rendering code yourself?

Your maps are gorgeous. Would you mind to share which tileset are you using in the Helsinki map?

Thanks! The Helsinki map is just a normal styled google map