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On the county property records, 386 Moon Valley Rd is owned by another person (who lives elsewhere). I'm not gonna put the name on here, but it's available if you want to look it up. Publicly available criminal records on mocasenet (the missouri courts records site) list the address as the home of James Phelps as far back as 2011. I think it's reasonable to speculate that he's lived there at least 10 years, but it's not clear what relationship with the property owner exists (friend, family, renter?).
Also, if you DO go on the county records portal, you'll notice that an adjacent large property is owned by a person with the same last name as the victim.