50NL. 84s in BB big draw vs lag donk

[BPMaR]

Poker Stars - No Limit Hold'em Cash Game - $0.25/$0.50 Blinds - 5 Players - (LegoPoker Hand History Converter)

SB: $53.00
Hero (BB): $49.95
UTG: $49.05
CO: $22.75
BTN: $24.20

Reads: <font color="blue">Villain is lag donk, Real estate bets always</font>

Preflop: Hero is dealt 8 4 (5 Players)
UTG folds, CO calls $0.50, BTN folds, SB calls $0.25, Hero checks

Flop: ($1.50) 7 Q 5[img]/images/graemlins/spade.gif[/img] (3 Players)
SB checks, Hero checks, <font color="red">CO bets $2.50</font>, SB folds, Hero??