The Regulations of the Residential Tenancies Act set out different rules when providing discounted rents while protecting the lawful rent. You can review these rules under Regulations 516/06 sections 10 and 11 at https://www.ontario.ca/laws/regulation/060516. Further, you can review Part G entitled Rent Discounts from the Standard Form of Lease which discusses the legal ways of giving a rent discount. To review the Standard Lease, visit http://www.forms.ssb.gov.on.ca/mbs/ssb/forms/ssbforms.nsf/FormDetail?OpenForm&ACT=RDR&TAB=PROFILE&SRCH=&ENV=WWE&TIT=2229E&NO=047-2229E