Yes they did along with not being able to take more than one month's rent as a deposit. It applied to any landlord renting more than 5 units/properties. At the time, when I told my landlord (who is a policeman) about this, at first his agent said it only applied to Thais and not farang lol, but next bill I calculated it and only paid 4bht not 8thb, and have done ever since. I wish I kept a copy of the legislation at the time, in case I need it again.