Antonio Brown will be BALLIN' OUT in S.F. on Sunday -- even though he's not playing in the game -- 'cause the Steelers WR just rented out a CRAZY bachelor pad ...with a pool in the living room!
TMZ Sports has confirmed ... Brown is shelling out roughly $4,000 per night to live in a swagged out party palace for the week ... a place that comes with a pool in the living room, indoor hot tub, 3 huge projection TV screens and a 24-hour BUTLER!!
We spoke with the booking host for the place who says, "Antonio loves the place."
FYI -- Brown had company Wednesday night ... eating dinner and playing ping pong at the 4,000-square-foot pad with Vikings QB Teddy Bridgewater.