Holt Public Schools, Mich.'s unlimited-tax GO school building and site bonds are secured by an unlimited-tax GO pledge of the district. The 'A' Standard & Poor's underlying rating (SPUR) reflects the district's: Diverse employment opportunities in state government, automotive, steel, packaging, plastics, and fiberglass products industries; Low unemployment rates averaging 2.8%; Strong tax base growth due to new home construction; and Improved fund balance levels. The district's high debt burden is an offsetting factor that is mitigated, in part, by all its outstanding debt having been voter approved. Enrollment has been relatively stable, which is considered positive since many districts in the area have experienced declining enrollment. Currently at 5,300 students, enrollment is projected to grow to 5,700 by 2005,