The Blackstone Hotel, where Paddock made the reservations, overlooks the main stage and other stages at Grant Park where the music festival is held every year.
Paddock booked one room for August 1, 2017, two days before the festival kickoff; and then booked a second room for August 3.
But Paddock may have been scouting other locations, including the Life is attractive music festival, which was held in Las Vegas the weekend before Sunday's attack.
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A federal official said authorities are looking into the possibility Paddock planned additional attacks, including a auto bombing.
Investigators are poring over the life of Stephen Paddock, the 64-year-old retired accountant and professional gambler who fired on the crowd from the 32nd floor of a nearby hotel before fatally shooting himself.
Clark County Undersheriff Kevin McMahill said the shooting spanned between nine and 11 minutes.
Danley lived with Paddock in Mesquite, Nevada, northeast of Las Vegas.
Investigators looking into Paddock's background and his movements before his killing spree erupted in Las Vegas say he must have had some help along the way given his huge arsenal and precise plans, but they have no idea who that might be.
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Investigators also found a computer and 23 guns with him at the hotel, along with 12 "bump stock" devices that can enable a rifle to fire continuously, like an automatic weapon, authorities said.
Law enforcement officials claim they found no evidence Paddock ever went to Chicago during the weekend of Lollapalooza, a music festival that attracts thousands of people.
The previous weekend, Paddock had rented a high-rise condo in a building that overlooked the Life is handsome alternative music festival featuring Chance the Rapper, Muse, Lorde and Blink-182, said Lombardo, who offered no other details about what led Paddock there.
He said that it was only logical to "make the assumption" that Paddock had "some help at some point" in pulling off Sunday's massacre, pointing to Paddock's huge arsenal, explosive materials found in his vehicle and his meticulous planning.
FBI Deputy Director Andrew McCabe said he was surprised Paddock had provided so few clues, and that has proved challenging. McMahill said it was also unclear what Paddock meant to do with the tannerite.
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Danley said she was unaware of any plans Paddock had when he sent her overseas to see family in her native Philippines.