Should a commercial landlord agree to accept monthly rent?

In these difficult economic times Tenants of commercial premises are increasingly asking Landlords to permit them to pay rent monthly instead of quarterly to assist cash flow. If the Landlord’s property is in charge to a bank it is usual for the terms of lending to assume that rent will be paid quarterly. So, if a Landlord accepts monthly rent they could inadvertently commit a breach of the terms of their lending.