It doesn't sound like a type I or II building but you may find this answered in the construction records if your construction department keeps them.
334.10(3) Other structures permitted to be of Types III, IV, and V
construction except as prohibited in 334.12. Cables
shall be concealed within walls, floors, or ceilings that
provide a thermal barrier of material that has at least a
15-minute finish rating as identified in listings of fire-
rated assemblies.
Informational Note No. 1: Types of building construction
and occupancy classifications are defined in NFPA 220-
2009, Standard on Types of Building Construction, or the
applicable building code, or both.
Informational Note No. 2:
See Informative Annex E for
determination of building types [NFPA 220, Table 3-1].