*BREAKING* Vegas Shooter May Have Planned August Massacre In Chicago

Details are now emerging that Stephen Paddock booked 2 hotel rooms in Chicago for Lollapalooza in August, specifically requesting a room overlooking the venue.

This killer asked for two rooms at the Blackstone Hotel, one for the 1st, & the other for the 3rd. The concert started Aug. 1st & ran until the 3rd, with an attendance of approximately 400,000 people.

TMZ, which broke the story, reports Paddock booked the rooms through a third party -- Expedia. Our sources say he then called the hotel and asked for a view room.

We're told the hotel does not guarantee view rooms, but for some reason in the hotel computer system there's a note that guaranteed Paddock a view room.We're told the hotel is now trying to figure out why someone on the staff broke policy by guaranteeing him a room with a view.

It appears Paddock didn't know he got what he was after -- a guaranteed view room -- because the notes in the computer say if he couldn't get a room with a view he wanted a heads up before arriving.

As it turned out, Paddock never showed.

Now, the picture becomes clearer. This man was planning a mass murder for quite some time, & did not 'SNAP' as many have suggested.