The storms damaged the roof, ripping a chunk off of the west wing of a retirement community called Constitution House.
Around 100 people were evacuated from their residence units. About 20 cleaning crews were on-site Saturday night, and about 20 crews were there again Sunday morning.
"There was extensive water damage on the top 3 floors, and so carpet needs to be ripped out, the walls are soaking wet, and there is some interior damage to people's propery," said Jodi Brutto of ServiceMaster Clean.
On the top floor, the ceiling has started to give way and fall.
All night long, crews have been working to cover the openings so more water get inside.
Luckily, no one was hurt, but many people spent the night with relatives or in vacant units in the building. Everyone in the building had power Sunday, and no one was injured.
A few streets over on Hartford, a lightning strike apparently caused a fire at an apartment building.
17 people there had to find another place to stay.
The City of Aurora said Sunday that it had crews working until midnight Saturday night to address around 50 service calls for downed trees and other damage. They said the most urgent calls had been addressed, and the southwest and southeast sides of the cities were worst-hit.
According to ComEd, approximately 5,000 people in Aurora were without power Monday. Crews worked over the weekend to restore power to all area residents. At the height of the storm, nearly a quarter of a million people lost their lights and air conditioning.
The south suburbs were hit the hardest, where almost 31,000 ComEd customers were still waiting to have their power restored Sunday morning.
Elsewhere, in Morris, about 60 miles southwest of Chicago, storms caused a semi to flip onto its side with the driver inside.
The semi was parked, and the driver, who was sleeping inside, was not hurt.
The fire chief also says strong winds blew over a 250-foot transmission tower.
Dozens of people called in to report trees on houses and cars.
Much of the town of Morris lost power.