What should I put in my minecraft skyscraper?

Me and a few friends are making a roleplaying server in a modern city, where we will all have jobs and we'll buy houses and items etc. Anyway, I built a huge skyscraper and it's really awesome, except, it's empty. I was wondering if someone could tell me what I could put in there that would suit apt he modern Roleplaying theme. The area of a room is 17 x 17 for the floor. Please try and provide pictures so I can see how it would suit the theme.