In the early 2000s MSP had five areas. Area I had Unit 29. Area II had units 12, 15-B, 20-, 25-26, and 30. Area III had units 4, 10, 17, 20, 22-24, 27-28, 31, and 42. Area IV had Unit 32. Area V had Central Security. At that time 18 units housed prisoners, with the 1,488-bed Unit 29 being the largest unit in terms of prisoner capacity and the 60-bed Unit 17 being the smallest. At that time the prison's capacity was 5,631. The Internal Audit building, located along Guard Row, was destroyed in a fire in 2002. In the mid-2000s MSP had three areas. Area I had Units 15 and 29 and the Front Vocational School. Area II had units 25-26, 28, 30-31, and 42. Area III had units 4 and 32. At the time 10 units housed the 4,700 prisoners in the facility, with the 1,568 bed Unit 29 being the largest unit and the 54-bed Unit 42 (the hospital unit) being the smallest. At that time the prison's capacity was 4,840.