If you are managing your own property you do not need a license.
If you are managing someone else's property under a "power of attorney" you do not need a license.
Normally, this is a family situation.
If you are considered the property manager as a part of a home owner's association, you do not need a license.
If you are advertising, listing, renting, and handling the monies for a property outside the above examples you need to be either a licensed agent working under the supervision of a broker, or be a broker.