In an environment where one out of every four small businesses is in delinquency on its rent, it would seem to me that commercial rents should be dropping like a stone across the board.
Commercial interests would rather tear down all the appurtenances on land rather than rent improved properties at a loss. Thus the improved properties become ever more scarce, resulting in either bidding the rents still higher, or moving to lease of land only, and the lessee builds the improvements necessary to conduct business, only to lose title to them altogether should the land lease end.