If it rises too much than no one can afford the rent and the place will be vacant, The local economy will drop, The area will lose population, And they will have to lower rents to an affordable amount. The rent must be affordable! The entire area will go downhill.
God no if you were broke and only had a house and apartment
Under California Law, There is currently no maximum limit for rent increases. As of January 1, 2001, A landlord must give the tenant at least 30 days' advance notice if the rent increase is 10 percent (or less) of the rent charged at any time during the 12 months before the rent increase takes effect.