>Many traditional real estate investors are perplexed by WeWork’s $5 billion valuation. With that kind of money, you could build the world’s most expensive skyscraper—One World Trade Center, which at 3 million square feet has roughly the same cumulative amount of office space as WeWork—and still have $1 billion left over.

I'm as dismissive of ridiculous startup valuations as anyone, but this seemed like a weird way to evaluate whether their value was justified.

For reference, here are a couple of other similar statistics:

* There are about 250M Apple devices in use (100M/yr * 2.5 yr lifespan). At 750B market cap, they're worth $3000 per i____ out there, or enough to buy every one of their users an iPhone and still have $500B left over.

* There are about 200,000 active Uber drivers, and they're valued at $50B. That's $300,000 per driver, or enough to buy every one of their drivers a Tesla and still have $40B left over.