Most commercial property rentals allow the existing tenant to sublease or assign their premises. Typically, the Landlord is unable to unreasonably withhold consent to a sublease/assignment. A prudent Landlord however will consider the strength of covenant being offered by the incoming sub-tenant when deciding whether or not to offer its consent. A Landlord will usually only accept a sublease/assignment if the financial position/security of the proposed sub-tenant is the same or better than that of the existing tenant.