It doesn't list any address for halfway houses in articles I found. Just that they were "in St. Joseph." They may have been out on the East end of town which was more undeveloped back then.
Links to various articles:
"In October 1989, 11-year-old Jacob Wetterling was abducted near his home in St. Joseph, Minnesota by a masked man at gunpoint. Police later learned that halfway houses in St. Joseph also housed released sex offenders. In 1989, Minnesota law enforcement had no comprehensive list of sex offenders to aid their efforts in solving the case. (Only a handful of states, including Alabama, Arizona, California, Florida, Nevada, and Ohio, had such tools at the time.) Jacobs parents, through the formation of the Jacob Wetterling Foundation, helped push Minnesota policymakers to change this situation by enacting sex offender registration in 1991."
https://www.musc.edu/vawprevention/policy/fedoffender.shtml
halfway houses in St. Joseph housed sexual offenders after their release from prison
http://www.pameganslaw.state.pa.us/History.aspx?dt=
Also, same info here:
http://scholarship.law.wm.edu/cgi/viewcontent.cgi?article=1126&context=wmborj
No sex offender halfway houses in St. Joe listed on this resource list from 1994-2001
http://www.intech.mnsu.edu/davisj/resource_list.htm