Ontario's Residential Tenancy Agreement (Standard Form of Lease, form 2229E) is required for most new residential tenancies signed in the province — houses, condos, basement apartments and secondary suites alike, whether the agreement is a fixed term or month-to-month.
It's a government-issued template, downloadable directly from ontario.ca/standardlease. A landlord can't substitute a homemade lease and expect it to carry the same standing — and any term in a side agreement that conflicts with the Residential Tenancies Act simply doesn't bind the tenant, standard lease or not.
A portfolio running both long-term leasing and short-term stays needs to be precise about which unit is under which regime: a long-term lease on the standard form is a materially different legal relationship than a short-term guest stay, and treating them as interchangeable — reusing lease paperwork for a nightly booking, say — creates exposure neither the RTA nor a booking platform's terms were built to cover.