WeWork delayed its hotly anticipated IPO after investors questioned its valuation, business model, and CEO Adam Neumann's role in the company. The co-working company was valued as high as $47 billion, though many don't agree with that number. WeWork has tried to justify its valuation by saying it's a tech company, but most investors think it's a real estate company. At its core, WeWork is a landlord. Visit Business Insider's homepage for more stories.