The occupants were evacuated from their homes for their own safety.
The wall which is thought to be over 200-years-old had collapsed into the back gardens of some of the houses causing structural damage to some. While the collapse put the occupants of the lower houses in danger, the houses above were mostly undamaged.
It's not known how long the people will be put out of their homes.
A spokesperson for Cork City Council said the local authority has no role in the issue as the building is under private ownership
"The property is in private ownership, so the matter is a civil issue between the affected property owners."
Two units of the Cork City Fire Brigade from Anglesea St and one from Ballyvolane initially attended the incident from 8.30pm and returned to base at 11.25pm.
This is one of three incidents of buildings collapsing in the city area in the past year.
Last June, a building on North Main Street partially collapsed and that building is still cordoned off at present.
In September 2019, the underside of a windowsill at 89/90 Patrick Street fell on a woman walking to a work event.