There is no standard form or format for a letter of authorization to be used at the Landlord and Tenant Board, nor does Landlord's Self-Help Centre have a template for client use at this time. We suggest simply writing a letter specifying the person that will be representing the landlord at the hearing and having the same letter signed by the landlord. For more information on who can represent a landlord at the LTB -https://tribunalsontario.ca/documents/ltb/Brochures/Who%20Can%20be%20a%20Representative%20Before%20the%20Landlord%20and%20Tenant%20Board%20%28EN%29.html