Brendan McDermid/Reuters
- WeWork says there's "substantial doubt" that it can stay in business given its financial problems.
- The shared-workspace giant's woes may spell trouble for commercial real estate as a whole.
- WeWork's failure threatens a "systematic shock" to the sector in many US cities, one expert said.
WeWork is in serious trouble, and it could be the canary in the coal mine for the US commercial real estate sector.