A five story building is proposed, with the ground floor being used for retail space...

NFPA 13 is the applicable standard for the design of the fire sprinkler system in a mixed-use building with retail space and residential apartments without a 3-hour rated separation. NFPA 13 provides comprehensive coverage for commercial and residential spaces in multi-use buildings.

References: NFPA 13 outlines requirements for the installation of sprinkler systems in various occupancies, including mixed-use buildings, to ensure adequate fire protection.