If you've ever played Sim Tower, that's what Project Highrise is. Build a tower and fill it with offfices, shops and residents. It's not the most deep sim game I've ever played, but I had fun trying to make aesthetic and themed towers. Be careful of your tower crumbling down though, as one service leaving can cause a cavalcade of people moving out. Definitely worth the 5 bucks I paid for it at the bargain bin.