1) must serve on the agency by regeistered or certified mail 2) Agency must be seved at its mail office AND mail a copy of the summons to any other defendats at their last known addresses 3) Good faith exception: 35 day requirement can be relaxed when litigant makes a good faith effort to issue summons within tha period. Litigant MUST make an affirmative step in order to invoke this thou -can't just sit on your tushie until 35 days are up