What does the California Penal Code define as the unlawful entry into a building with intent to commit a crime?

The definition of unlawful entry into a building with the intent to commit a crime is clearly articulated in California Penal Code as burglary. This crime specifically involves entering a structure, such as a building, with the predefined purpose of committing theft or any other felony once inside. The key element here is the intent at the time of entry, which distinguishes burglary from other crimes that involve entering a property without lawful permission.

Other options present different criminal activities, but they don't match the definition provided in the question. Theft typically refers to the unlawful taking of someone else's property with the intent to permanently deprive them of it, which may occur after an entry but isn’t defined by the act of entering itself. Robbery involves taking property from someone with the use of force or intimidation, which is a separate and distinct offense from burglary. Trespassing refers to entering someone's property without permission but does not require the intent to commit a crime within the structure, making it distinct from burglary. Thus, burglary is the accurate answer in this context, as it encompasses the specific unlawful entry with criminal intent defined in California law.