how to prevent a sex offender from building a house within 3000 feet of 2 of his victims

i would either get an attorney to assist you or do some work yourself. look at his criminal file to see if he can do this. it may be a violation of your states megan's law if he is subject to that. secondly, check your local ordinances to see if he violates those. next, go to borough council and complain. you can even get a petition signed by neighbors and citizens.