This is on a pre owned BMW 2016 328i xDrive GT w 5000 miles in Virginia.
It includes:
Navigation System ($1,950)
Driver Assistance Package ($950)
Wheels: 19 x 8 Lt Alloy Double-Spoke ($900)
MSRP: $48,295
Sales Price: $37,980
MF: .00174
RV: 59%
Acq: $925
Dealer processing fee: $299
Tire charge: $69
Monthly (fees, taxes, tags): $470
12K/36M
Monthly ($3k fees, taxes, tags upfront): $390
12K/36M
MF marked up to the max
What would be reasonable to negotiate down to?
.00134 then apply max MSD
Is this Silver Spring? $69 is for nitrogen right? Laughable. The discount for a demo is average, as pointed out elsewhere the MF is marked up to the max. There is a lot of work to do for a great deal.
I know this is in Cali, but its 10k off a new one.
https://www.cars.com/vehicledetail/detail/654823643/overview/
Solid goal is 12K off and base MF.
Ha! Did the the $69 tire charge give it away?
I always insist on 78% nitrogen in my tires 
that and the 299 processing fee. I actually leased my wife’s X5 demo from them. I told the CA i was only going to deal with base mf of .00134 and his face went blank, he brought me to the manager and we got a deal worked out relatively quickly. Although he did try to raise the MF without telling me at one point, I called him out on it. He apologized and said he was in used cars and didn’t typically deal with leases.
Could’ve been Rockiville also 
I don’t know how you guys find the time to do this but searching cars, and contacting dealers is quite time consuming.