Rent for new tenants in a property could be linked to what the landlord charged the previous tenant. For example, the new rent could be limited to a certain percentage more than the previous tenant paid. This would help slow the rate of rent increases when tenancies change, and give new tenants a fairer deal relative to previous tenants.
A larger rent increase could be allowed if a landlord has made substantial improvements to the property that genuinely increase its value (e.g. a new upgraded kitchen or bathroom, or building a garage), but not just what is required to meet Healthy Homes Standards or for regular maintenance and upkeep like basic paint jobs, new curtains, or fixing leaks.