Wholesaling a Short sale! (BK, NY)

[Colbert Saint-Laurent]

I have a Quadruplex (4units, 6bed, 4bath) in Bedford-Stuyvesant , Brooklyn for $500k. Great income property to rent $1,500 a month. Building is worth at least $800k. The property is 3,871 sq feet. comps:
Recently sold:

price date sq. ft
$802,654 05/02/11 – 3,800
$689,000 04/18/11 – 3,800
$900,000 05/03/11 – 3,780
$692,000 04/15/11 – 3,152
$775,000 04/28/11 – 3,628

What is a good wholesaling fee?