hi inkblot i am sorry i didn't get to respond to this last night but i was going to say almost exactly what docjohn said... write him a note, be, short, clear and specific, that you want him to stay away from you. Be polite but DON'T be apologetic in any way, shape or form. Err on the side of formality. Don't give him even one line that he can "hook" onto and say to himself "she really does like me" because you care about his feelings or anything like that, otherwise he may just focus on that and ignore the rest of the note.

Of course be very careful but hopefully the end result of this will be not only that he doens't bother you anymore but that you once again feel comfortable and safe in your own building. If he is just a flaky guy then this should work out, it may take a visit from the police or something. But until you know that for sure just be careful and stay safe.

Do you have a can of pepper spray or something just in case?

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