We've been renting for a year and a half and our landlord keeps showing up unannounced (Usually about 2-4 times a month). He doesn't call prior to his arrival, but he makes his secretary call us to tell us to open the door after he has given up knocking on the door. We aren't trying to avoid him, but sometimes, when he comes over, it's a bad time and I'm not prepared. Can he do this? Isn't he supposed to give some kind of notice before coming over?