On Thursday, Imad and Bahaa Dawara pleaded guilty to conspiracy to commit arson and conspiracy to defraud the United States.
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The siblings were charged after their hookah bar and lounge at 2nd and Chestnut streets went up in flames in February of 2018, causing more than $20 million to the retail block.
SEE ALSO: 4-alarm fire in Old City ruled arson, ATF says
4-alarm fire in Old City ruled arson, ATF says
The blaze destroyed a neighboring business and gutted two mid-rise buildings, leaving 160 people homeless. A number of pets also died.
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Officials say the brothers set the fire for insurance money, following a dispute with their landlord. Federal prosecutors say the Dawaras had taken out $750,000 in insurance weeks earlier.
The Dawaras, who used gasoline to start the blaze, would serve nine years in prison and pay $22 million in restitution under terms of the plea agreements entered Thursday. Their sentencing is set for June.
SEE ALSO: Brothers indicted in 2018 Old City arson
Brothers indicted in 2018 Old City arson
-- The Associated Press contributed to this report.