Liberal MP John Sidoti failed to declare his part ownership of a commercial property which will potentially benefit from a rezoning decision by Canada Bay Council that was supported by Liberal councillors.

Property records show Mr Sidoti – who is the member for Drummoyne and also parliamentary secretary to Premier Gladys Berejiklian – is a co-owner of 120 Great North Road, Five Dock.

However, the property does not appear on Mr Sidoti's latest register of pecuniary interests lodged with the NSW Parliament.

In February, Canada Bay Council voted on a controversial rezoning proposal that would create a laneway behind 120 Great North Road, providing rear lane access for the first time.