Help on a lease agreement for 2018 GLC 300

I’m new to leasing cars and it’s been a steep learning curve. I live in DC and visited a dealer in Bethesda, MD who offered the following terms on 2018 GLC (which I didn’t yet sign):

MSRP: $49,245
Negotiated Price: $43,670
MF: 0.0019
Residual: 57%
License/Registration Fee: $275
Acquisition Fee: $795
Doc Fee: $299
Term/Mileage: 36/10K
Down-payment/Incentives/Rebates = $0

With the $920 prepaid maintenance package (making the total negotiated price $44590), my monthly payment on the lease agreement is $641.47+tax = $707.22. The lease calculator gives a pre-tax monthly payment of $621. I can’t figure out the discrepancy here.

I would very much appreciate if someone can help me by addressing a few questions:

(1) If this a reasonable deal? If not, how do I go about getting something better?
(2) Why is the monthly payment different on the lease argeement and lease calculator?
(3) The dealer never mentioned MSDs (which I learned about afterwards). Should I bring this up with him? How should I do this and what should I be looking for?
(4) If anyone know about this, why is the DC tax on the monthly lease payment 10.25%. I can’t find any reference to this, and I had the impression it would be lower since DC tax is generally not that high.

Thanks for all your help in advance.

At least they don’t mark up the acquisition fee. Bethesda will not do MSD, as far as I know, and they will mark up MF (don’t know if yours has been marked up, though). The tax is correct, they can’t fool with it and know what it should be for DC or VA.
The deal sucks, btw.

Thanks for your comment. I should have mentioned that the lease hackr score is 6.4 year. Any advice on what I should look for in a better deal?

The GLC doesn’t lease well and interest rates have been going up. If you can use MSD’s in your state and you have the cash then find a dealer who will do the same discount or better, plus MSD’s. Other than that your only choice is to look at other equivalent vehicles like the Stelvio which would be quite a lot less. If you have really good credit swapalease.com is also an option.