Surely it's because when you've borrowed a lot against a highly-valued property you don't want its perceived value to be reduced (by having low rents) in case t

Surely it's because when you've borrowed a lot against a highly-valued property you don't want its perceived value to be reduced (by having low rents) in case that triggers the lender to recall the loans. But I too don't know enough about the commercial real estate "industry".