When you first move in
There is usually no limit on how much rent landlords can charge new tenants when they first move in. So your starting rent will be whatever you and the landlord agree on.
Exception: Sometimes the Landlord and Tenant Board orders that the rent cannot be raised until the landlord does certain repairs or maintenance. This is called an Order Prohibiting a Rent Increase (OPRI). When you move in, the landlord must tell you in writing if there is an OPRI on your new place, and how much the rent can go up after the Board removes the OPRI.
After you agree on a starting rent, there are rules about how much and how often your rent can go up. These rules are explained in the section Guideline increases.