Whe I was in Greece I also saw a lot of buildings that seemed incomplete, often with apparently a floor missing. I was told it was something to do with tax and by not "completing" the building some tax was avoided.
Ahh, I see. I feel like I've seen this in otherwise half-finished buildings, but not really in buildings that otherwise look complete, with people living in them, etc. Maybe I'm so used to it that I just don't notice it, though. I'll keep an eye out and report back!