Again DON'T put any money down on a lease.
It doesn't make any sense at all.
You can sell the car yourself or to the dealer or carmax whatever. But after that pocket the money.
If you use it on the lease you are NOT lowering your money payment. You are just paying in advance. In the end you are still paying the same amount of money but earlier. (and less safe, totaled etc)
Why would anyone do that? Better to put that money in a bank and pile interest or invest it.
2011 535i Alpine White, Oyster on black interior, Premium 1 & 2 Package, Magnaflow Full Cat-Back Exhaust, JB4 Stage 2