The Brief An 18-year-old fell about 20 stories inside a decommissioned grain elevator Monday night. An 18-year-old was critically injured after falling approximately 20 stories inside a decommissioned grain elevator in Minneapolis Monday night. Teen falls 20 stories inside grain elevatorWhat we know:Minneapolis police said a group of teenagers were reportedly trespassing at the decommissioned Checkerboard Grain Elevator in the 3700 block of Cheatham Avenue when the 18-year-old fell about 20 stories before landing on an elevated platform. Big picture view:Police have had between nine to 12 previous trespassing calls at this grain elevator. Neighbors say warnings went unheeded about grain elevator dangersWhat they're saying:Neighbors say they have repeatedly reported concerns about the site.