The house of worship went up in flames last week.
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Firefighters battle blaze at church with daycare in Parkside
Sunday services held outside after massive church fire
L&I discovered more than a dozen adults living in the rectory, in what they call deplorable and unsafe conditions.
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They have issued an intent to cease order and will close the building with the exception of two church offices on Monday.
L&I also said it is monitoring plans to demolish the roof, and will intervene if necessary.
A massive fire broke out at the church last Tuesday, shortly after workers used a torch on the roof.