To say it outright: there is hardly a building in Beijing that doesn’t. You have basically three options:
1. Ignore them.
2. Make friends with them. Legend says that some students even tried to tame them and make them perform circus acts. Whether they succeeded in doing so is not reported.
3. Declare open war on them and choose from a huge variety of chemical weapons of mass destruction (Roachkill, trap and all other necessary utensils can be purchased at Carrefour or any other supermarket nearby). Keeping food not stored in the open but wrapped, keeping the kitchen and bathroom clean also can bring positive results.