Anonymous wrote:You cannot afford it, if you don't have enough for a down payment.
Did you read the title? OP said "lease". Rule No. 1 on lease - never put money down on lease (same way no one puts money down on rents). If you put money down on lease and wreck your car out of the lot, that downpayment is gone.
OP: don't let the dealer sell you on monthly payment. Ask them for money factor and residual value (for the mileage amount you want, 10K, 15K, etc.). If they refuse to tell you, walk out. Once you have these two numbers, you can run the lease payment yourself (do you know how?). Last, pick the car/options/color/etc. then NEGOTIATE the price just like you are buying a car.