I have a friend who signed a two-year contract with a property management company as a security guard, but now the contract between his community and this company has expired. ...

It depends on the specific content of the contract. If the salary is not specified in detail in the contract (not reflected in the general labor contract), then since the property management company has provided the first choice, there is no nominal breach of contract even if the contract is continued. Just like many companies lay off employees, you don't have to be fired. You only need to pay a small salary. If you want to leave, you can ask yourself.

To say the least, even if the property management company defaults, it will be difficult for your friend to get compensation. This kind of dispute needs to go through the process of labor arbitration or prosecution, which requires cost, time and energy, and we cannot afford it. On the contrary, advise your friend to find another job. There's nothing to lose here. It's already good. There's no one here, so there's room for someone.