Going to the office isn't what it used to be. As more workers shift to on-demand and "gig" employment, the workplace has changed, and no company has capitalized on this more than WeWork.

With free-flowing beer and coffee, the smartly designed offices that have popped up in dozens of cities in some 20 countries have become coveted by small firms and freelancers in technology and other sectors.

WeWork, with a whopping valuation by investors of $20 billion, has taken the lead in the co-working space and in the process is disrupting the office and real estate market.

"At WeWork, we want to create a world where people work to make a life, not just a living," says chief executive Adam Neumann, who co-founded the group in 2010 in New York with  Miguel McKelvey.