Which crime involves the intent to commit theft upon entering a building?

Burglary is defined as the unlawful entry into a structure with the intent to commit a crime, most commonly theft. In various jurisdictions, this specifically includes entering a building with the premeditated purpose of stealing property inside. The key element here is the intent that must exist at the time of entry; simply entering a building without this intent would not satisfy the legal definition of burglary.

Robbery involves taking property from a person through force or intimidation and does not require entry into a building. Trespass refers to unlawfully entering or remaining on someone's property without permission, but it does not include the intent to commit theft. Fraud involves deception to gain something of value, which is entirely different and unrelated to the physical act of entering a building with the intent to steal. Understanding these definitions highlights why burglary is the correct answer to the question regarding the intent to commit theft upon entering a building.