I wouldn't recommend to lease a used BMW. LIke some good people on this forum indicated that the rate is higher, and it is not feasible.
If you want, I got acquainted with this CA at BOB SMITH BMW in the internet department. He has the best service-referred to him few people and they were satisfied. He can help you out.
I haven't gone there because my car will be paid off soon
(you'll be mine E90 M3)