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Earlier this week Mr Major - who designed Stadium Southland, which collapsed in heavy snow in 2010 - was expelled by the Institution of Professional Engineers for breaching its code of ethics.
The Institution said all his work should be checked.
QLDC chief executive Adam Feeley confirmed Mr Major was involved in the design of two council buildings.
The council is in touch with the private owner of another building which Mr Major designed, and it was checking his involvement with another private development.
Mr Feeley would not name any of the buildings.
Engineers have carried out a detailed structural assessment, including the removal of sections of roof and cladding, on one council building, he said.
The building does not meet the current earthquake code, he said.
A desktop assessment had been done on the other building's structural integrity.
Both council buildings are occupied.
Mr Feeley said the council was taking the situation seriously but urged calm.
"There will be lots of buildings in Otago and Southland he has been involved with.
"If there is a perception that having Tony Major's name next to [a design] means there is a problem would be a very dangerous perception to have, and largely wrong."