What are back letters? A back letter is a personal contractual arrangement between the granter and the grantee, ie in the context of a commercial lease, between the landlord and tenant. The terms of back letters are usually intended to be: • legally binding • personal to the parties to the letter or binding on successors in title When are back letters used? A back letter softens the terms of a lease. They are used: • to give the initial tenant a ‘sweetener’ or inducement to help the deal happen. In such cases, the landlord will require that any concession that is not to be available to the tenant’s assignees is contained only in a direct back letter in favour of the initial tenant • to make arrangements and grant concessions (eg in relation to the permitted use, the standards of repair or rental concessions), or • to avoid ambiguity, for example, on assignment or rent review It is often the case that during detailed negotiation