@brennas2 wrote:
....if the rental property and the business are grouped, and the rental property realizes a loss, can that loss be applied again the income of the business since they are grouped as an economic unit?
Yes, but only if grouping the rental activity and trade/business activity results in an appropriate economic unit, which is generally not the case as far as the IRS is concerned.
See https://www.irs.gov/publications/p925#en_US_2019_publink1000104608
