My first tenant which has been here over 3 years started at a discounted rate and is paying 20% less than my last tenant to move in. I have never raised there rent. The first tenant has not experienced a rent increase.
These units are available for at will tenancy(no lease). My plan is to raise the rent on turn over rather than nickel and dime the existing tenants.
A noble attitude, check the tax laws.
A friend of mine got in trouble in Munich for collecting to little rent.
Authorities assumed some form of tax fraud.