- As the commercial market is a large investment arm for financial institutions, a collapse in the commercial market can cause a credit crunch (banks don't have enough money to provide loans like they used to). Making it more difficult for people to get mortgages or loans for residential property.
- As the commercial market falls, investors and developers will begin looking toward the residential market for their investments. This could lead to an increase in residential housing availability. However, I believe this would exacerbate the trend of "build-to-rent" communities as it would provide the developer/investors with consistent, predictable, monthly income.
Ultimately, a "collapse" of the commercial real estate market would severely negatively impact the residential housing market due to consolidation. If renting out office towers is no longer profitable, why not rent out entire housing communities? And since banks are crunched and may have to further restrict their mortgage and lending practices, low and middle-class people could be further locked out of homeownership.