I took a spin by the Sievers house during my lunch break. Someone (probably a neighbor) may have trimmed down the front a little - but still looks horrible...The backyard looks like a jungle! I wouldn't go in there without a stout pair of boots and a shotgun
It's hard to tell if there is any power to the place but if the Air Con isn't running at least on "away mode" then the inside of the house is going to be full of black mold.
Maybe bulldozing the house is the best thing for it!
There have been a couple of houses where I have lived and murders took place....and some of the houses they did bull doze to stop gawkers! Infact the BTK house, Park City, KS, where BTK lived was up for auction. A local business lady was going to purchase it to stop it from being used in a bad way. However, the city stopped the sale and the city purchased the house. That land then was added on to a park, used for more play area and also another driveway into the park....the land was put to good use.
Maybe that is a good idea for places where terrible things have happened....remove all reminder and make it a happy place again....well try to.