What does the upper class do for work in the city?

My boyfriend and I are in our mid twenties, and have good jobs - we make roughly 115k a year together. At that, we live above our means here for housing/cars/bills.

What types of jobs are the young people working to afford living in the high rises or condos comfortably? We were just chatting about this. I suggested some must come from old money. I'm in the mortgage industry, & he's in a trade.