I suggest you go to the ATO website and look up capital gains tax. You will have to do a fair bit of reading if you don't want to consult an accountant. You don't have to give the accountant all your paperwork, just a 15 or 20 minute consultation (obtain a cost first) will put you on the right track.
Very simply, ignore the depreciation on fittings. Depending on when you bought the IP, you may have to deduct any building depreciation claimed from the cost base, thereby increasing your gain for CGT.
Marg