Locked in Long Term Contract

My situation is as follow,

I had an IP that I rented out for 3 years, it has been running for a year now. I am thinking of selling the property out.

Is this possible ? Do I need to break the contract or should I just sell it to other property investor out there?

Thanks Guys for your help.
what offences and penalties will you incur by breaking the contract? how do you break it anyway? send the boys around there and hurf them onto the street???
It may be different interstate, but in Queensland existing leases have to be honoured by the purchaser, which restricts your sale to an investor.