user_22186234
The northern building (331 S Ridgeland Ave APT) is a Condominium as described:

"UNIQUE END UNIT TOWNHOME IN MASON LOFTS~2003 CONVERSION FROM A CHURCH BUILT IN 1905~LARGEST UNIT IN THE BUILDING~CATHEDRAL CEILING~"

The southern building remains a Chapel, with both the ground and (I assume) upper floors remaining the same. The church is very well active, leading me to believe that only the northern half of the church was converted to condominiums.

https://catholicmasstime.org/church/our-lady-immaculate-church/3030/

https://www.zillow.com/homedetails/331-S-Ridgeland-Ave-APT-A-Oak-Park-IL-60302/65550589_zpid/