It would seem, by Bradbury's descriptions, that the firehouse in his futuristic setting is much like the same as one would find in today's world. On page 4, Montag is shown cleaning his helmet and hanging up his fireproof jacket and clothes. Then he showers on the upper floor and descends by way of a golden fire pole down the hole to the lower level. The next time the pole is mentioned, it is described as a brass pole (24).
When the reader is introduced to the firemen's Mechanical Hound, Montag comes in from having a cigarette and looks at it in its kennel on the ground floor. Then it describes how the men let the Hound kill rats and other small animals in the "firehouse areaway" (25). This suggests that there is a large space on the ground floor, which is probably more like a garage that houses the fire vehicles along with the Mechanical Hound.
Montag then turns from the kennel of the Hound and the following is described:
"Behind him, four men at a card table under a green-lidded light in the corner glanced briefly but said nothing" (26).
Based on the evidence, the card-playing table is on the ground floor along with the hound and the vehicles. The firehouse even has a bell in the ceiling that "kicked itself two hundred times" when an alarm rang out (35). On this page, too, it says that Beatty reminds Montag to remember to get his helmet which is near the Mechanical Hound; so, the fireproof clothing and helmets are on the ground floor as well.