dealing with centre link is a nightmare john. One of your major problems is you have everything in your personal names and setting up a different structure will cost too much due to transferring assets due to stamp duty  and capital gains tax.
I am in a similar situation but sold my negatively geared property in 2005 after my two daughters were born due to the idiotic notion that a loss is actually a gain. This meant a tenant lost their home and have not since purchased anymore investment properties.
I only have one house rented out and I  own it so no negative gearing.
However I had to pay centre link back their payments as the capital gain was considers income – funny how a capital loss doesn't come off my income but capital gains can be deemed income immediately.
I could have claimed parenting payments for the last 5 years of a measly 60 a week and a healthcare card but having to report my earnings every 6 weeks seems to me to be a degrading intrusive process. So I did not claim it and I also have over estimated my income so that my family payment A is less with remainder paid at EOF and family payment B is paid at the end of the financial year so I do not get accused of fraud or have to pay money back to centre link.

I have done a rather drastic restructure and formed a company so I would recommend you get some accounting advice on what is the best structure for your investmewnt goals and situation.
Unfortunately I have a property in joint names that will cost too much to transfer into a company ownership.

I  can not by law advise you what structure to use as I do not know your situation and even though I have a degree in commerce with a major in financial planning  I do not have the FSRA financial planning licence from ASIC

I have used my rental manager to use the trademen on their books in the past

I have also used the grey army before they franchised http://www.greyarmy.com.au/services.nb

I have also found hire a hubby to be good also http://www.hireahubby.com.au/
they can be a little bit more expensive but I was happy with the end result

Jims may be another source http://www.jims.net/

If you want to use local people get the local paper for the area and all the local trades will be in it.
Sometimes bigger companies are too busy but the local tradies in the local paper will be interested in doing the work required.

contact council see if you can renew the DA  application

there are many books you could buy alex
you could look at www.activepropertynetwork.com.au
rookie developer course

Feasability
Ask your self what costs are involved
Surveyor
civic works
application to council fees
contribution for loading infrastructure called head costs sometimes
most important point what does a town house sell for (work this out and work backwards on costs to see if profitable)

as you do not know what you are doing a private town planner may be useful

Your accountant should be able to add the air conditioner to your depreciation schedule and work out its effective life of the air conditioner.

Hopefully you have factored in capital gains tax liability on the sale of your investment property in your next tax return.

Susan, It has become hard to find private finance since ASIC created new credit laws that make it cost prohibitive for private credit providers to meet their compliance requirements to keep a credit license and provide credit.

You may find a joint venture where you share the profit based on the share of investment may be worth investigating.

I have found a previous posts for you in this site that mentions an investor club
https://www.propertyinvesting.com/forums/property-investing/general-property/4330494

this may be how you could network with other investors from Brisbane.
http://www.meetup.com/brisbanepropertygroup/

Here is my tip for cutting straight lines. (1) use a drop saw
                                                                      (2) use a saw bench

(3) I use a piece of square wood and place this on top  of the timber to be cut
Then turn the saw blade so that the blade touches the wood you want to cut this way you can see exactly where the saw is going to cut.
Place the square against the square wood and once sure of position then use two g clamps to hold the guide wood in place .
This allows you to cut the timber from both directions as the g clamp can be further down the timber away from the saw motor.
 
If doing multiple cuts the drop saw is the way to go ! but for wider jobs I use step 3

http://www.capitalgainstax.com.au/capital-gains-tax-calculator.htm

it is complicated to explain. joint ownership you split the capital gain 50% each owner

>12 months ownership from contact dates not settlement dates then another 50% discount

Then cost base has to be considered to subtract from the final profit
http://www.ato.gov.au/corporate/content.aspx?doc=/content/36557.htm

But you can't double dip on this soas an example if you rented and claimed interest costs against rent each year then you can't claim interest costs as a holding cost on cost base.

what ever is left is added to your margin tax income to calculate what tax you will pay.