Third-degree burglary is when unlawfully forces entry into a fenced area, private property, residential yard, or non-residential structure. If a criminal enters an area with the intent to commit any type of crime (theft, burglary, or other felonies), the person can be convicted of a class c felony or a class d felony, depending on your state. The main defining feature of a third-degree burglary is that there is no one present in the building when the person breaks and enters. However, a third-degree burglary also includes breaking and entering into non-residential structures such as cars, boats, or other motor vehicles. If you break into a car using manipulation, deceit, a master key, or any other form of breaking and entering, you will be guilty of a felony.