You can be their property manager (be the one who handles the rental--i.e. vetting the tenants, getting the leases signed, collecting the rent, taking care of repairs, etc.) with nothing more than authorization from the home owner to do so...such authorization is best done by a written agreement which lays out exactly your responsibilities and your compensation.With authority from them, you can "represent" them in evictions in all ways EXCEPT in court (or to clarify: you can testify in court in an eviction case, but only as a witness--e.g. a witness to the unpaid rent and amount owed); only a licensed attorney can represent another person or a business in court.