How do I buy my RED Carpet leased car, when the dealership just closed?

I leased a car (Mercury Sable) in 2004, but recently the dealership I leased it from closed down. I have three more payments on the lease and I would like to buy the car, but not sure how to go about it now that the dealership has closed? What should I do? Who do I contact to find out how i buy the car?