M=15, poss. re-steal opp'y to improve 25%

[ellipse_87]

Party Aussie Satellite Qualifier, 1 ticket, 61 of 273 remaining
Seat 1: UTG ( $12005 )
Seat 2: UTG+1 ( $1086 )
Seat 3: MP1 ( $1250 )
Seat 4: MP2 ( $4320 )
Seat 5: MP3 ( $2632 )
Seat 6: CO ( $365 )
Seat 7: BUTTON ( $4155 )
Seat 8: SB ( $11270 )
Seat 9: HERO ( $3465 )
Blinds (75/150)
** Dealing down cards **
Dealt to HERO [ Xx Xx ]
UTG folds.
UTG+1 folds.
MP1 folds.
MP2 folds.
MP3 folds.
CO folds.
BUTTON raises [525].
SB folds.
HERO

What do you need to push here? My stack is below average, I have a tight image. Button has been pretty active; my one note says he called a 1500 all-in flop bet (half his stack) on a flush draw. I don't have a read as aggro or passive, just busier than one would expect from normal play. This is our first steal situation (but I haven't noticed him pass on any steals either; this could be his first opportunity.)