Missouri Revised Statutes Title XXXVIII. Crimes and Punishment; Peace Officers and Public Defenders § 569.160. Burglary in the first degree--penalty

1. A person commits the offense of burglary in the first degree if he or she knowingly enters unlawfully or knowingly remains unlawfully in a building or inhabitable structure for the purpose of committing an offense therein, and when in effecting entry or while in the building or inhabitable structure or in immediate flight therefrom, the person or another participant in the offense:

2. The offense of burglary in the first degree is a class B felony.