Client Wants Off Market Property - Advice?

[Michael Webster]

I've had a few clients over the years come to me and ask me to setup a sale for off market listings.  I've rarely had them work out.  Does anyone have a good suggestion on how to approach a seller?  I was thinking this time I might just drop a handwritten letter off to them and explain that I have a client interested in specifically their property.  Any wording/ideas would be helpful!