There is nothing in the Fire Code or Building Code that I can find that indicates that you cannot use a dry system in a heated area. The Building codes makes reference to automatic sprinklers systems shall be designed, constructed, installed and tested in conformance with NFPA 13 (Sentence 18.104.22.168.(1)).
NFPA 13 (see 7.2 Dry Systems) states that dry pipe systems should only be installed where heat is not adequate to prevent freezing of water. So, in my opinion, as long as you can meet the dry pipe system water delivery time based on the hazard, a dry system is adequate. It would be a recommendation for the building owner and/or tenant to convert the dry system to a wet system.