From the looks of things, this grain elevator in Kansas City, Kansas has been out of operation for a very, very long time. Demolition started less than two weeks ago, although it doesn't look like much progress has been made. The gaping rectangular hole, however, appears to be quite old judging from the stuff within.
This area on the far end of the silo appears to have been used for loading trucks and railcars as well as some office space. I saw evidence that it's very recently been used for shelter and/or home.