Under the Regulation Modules in Queensland, there is a ‘relevant limit for major spending’. If the amount of money proposed to be spent by the body corporate is greater than the relevant limit, the body corporate or the person proposing the motion must obtain at least 2 quotes (except in limited circumstances). The default relevant limit is the lesser of $10,000 or $1,100 @ the number of lots. The body corporate ma approve a higher limit by ordinary resolution at a general meeting.
So at your scheme the limit is $10k unless a higher limit has been adopted (because $1100 @ 24 > $10k). This means that the motion to spend $21k to appoint a maintenance coordinator should include at least 2 quotes.
See the Standard Module section 152.
You can also contact the Queensland Body Corporate Commissioner’s office for free advice over the telephone.