WeWork raised $5.6 billion in 3 months - here's how the co-working giant became the most valuable startup in New York City

WeWork

A common area is shown in WeWork Culver City in Los Angeles, California.

WeWork, a startup that leases trendy, millennial-friendly office space to startups and Fortune 500 companies, just became the sixth most valuable startup in the world.

It's been raining money all year long at WeWork. The company has raised over $8 billion in funding to date - with $5.6 billion flowing in since July - at a $20 billion valuation. It's the third biggest startup by valuation in the US after Uber and Airbnb, and the largest in New York City.

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And still, no one can seem to agree if the co-working giant can justify its sky-high valuation.

Take a look at how an architect and a serial entrepreneur set out on a mission to reinvent the office and, in the process, built a global brand that's worth $20 billion.