So you want to know the cost of a tower crane, thats a good starting question but its a bit like asking someone 'so how much does a house cost'
The answer to both questions is...
'well that depends'
First you have to decide what type of crane you want, secondly how long does it have to last and thirdly what is your budget, unless you are loaded like ol mate pictured above.
The gold standard in tower cranes is the Favco, there are some currently operating in Sydney that are in excess of 40 years old and provided they are maintained they will keep going. They have fewer break downs and are good lifters. An entry level Favco such as the M220DX pictured below will cost around $1.5 million including tower sections. They are available in diesel or electric with a max lifting capacity of 22 tonnes.