Company's 20,78, 64, 22 , ladder 236 activated for an automatic fire alarm Blues Spure plaza. Truck 20 first on scene reporting nothing showing from side A Truck 20 sent their manpower inside to investigate well truck 20 setup ladder operations for Engine 22 to head to the roof. Engine 78 sent their manpower inside with engine 20 staged at the hydrant engine 64 and ladder 236 remained in staging. After determining a false alarm command 20 returned all units.