I have no expertise to offer here but it strikes me that having such a lift might have been a condition of the development approval by local council, although no doubt originating at a much higher level eg legislation requiring access to people of all abilities. You could start at the Local Council level and ask some questions.
Whilst there may be no present need amongst the residents for the lift, what about visitors? There’s no way of knowing if a future visitor will need it, and it not being available when needed, may open your Owners Corporation to action for discrimination.
Also call the lift manufacturer and ask about any ways you can save on maintenance… again, I know nothing about this and it may be that mothballing it will work out more expensive in the long run as it will be more costly to restart it when needed, but it’s worth asking about.