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Sure, but $20B valuation seems hard to achieve.
US commercial real estate market by revenue is ~$1.1T [0]
Office space by value is about 1/8th [1]
Regus gross margin is ~16% [2]
Real estate generally has good PE ratio but partly because they usually own the property [3], so let's be generous at 30x.
So if we value WeWorks as a normal real estate company AND weworks has %100 of US office real estate business we have a valuation of 1100 / 8 x 0.16 x 30 = $660B.
Now, weworks exists outside of the US, but the valuation you propose means they must have ~equivalent of all US office real estate.
[0]- https://www.ibisworld.com/industry-statistics/market-size/co...
[1] - https://www.reit.com/sites/default/files/chartjuly92019.png
[2] - http://www.annualreports.com/HostedData/AnnualReports/PDF/LS...
[3] - https://www.investopedia.com/ask/answers/052815/what-priceto...