Sorry you are in this situation.I know it is a difficult one, dont think you are overreacting, and really do hope that the person leaves your building. I certainly wouldn't want to be in your place as I have young children. However, I always try to look at things from all angles, and I have several thoughts about your situation and i hope i don't offend anyone. I'm kinda nervous bout posting this (especially since its only my second and i dont want people to get the wrong idea about me)

I understand your fear about the person living in your building, but unless it is right near a school or playground or such place he is probably legally allowed to live there. Everyone needs to have a place to live, if not there, it will be next to someone else who probably feels the same way you do.

As for safety of people in hour household, you should evaluate EVERYONE around you as to if they should be left alone with your children/dependents/yourself. Luckily for you this was already done for you, since you know already you shouldn't trust him. People not capable of protecting themselves should be supervised at all times, regardless if someone around is convicted or not. A person doesn't have to be convicted of anything to be dangerous.

If the person does not leave, and you find it affects your life so extensively, perhaps you should consider moving. You may argue why it is you and not him who has to move, which I may agree with, but if he is legally there it may be your only choice. Also, like i said before, it will be your job to make sure he does not have access to anyone you are caring for.

As for the job, I'm guessing employers are just as excited about hiring him as you are living next to him. Not trying to make excuses, but like i said, i like to look at things from all points of view.

Hope i didn't offend anyone, it was not my intention as I would not want to be in that situation either. Good luck and hope you find relief soon.