It's not like MKZs are breaking any sales records, so I'm not understanding this salesperson's approach. He doesn't sound very professional either. Those numbers are so far off that my head is spinning. What part of the country are you in? I've found that leasing prices vary widely depending on ZIP code. My son moved to AZ a few years ago and the lease on his car was ending. The prices he was quoted in AZ were eye-watering. A Honda Accord was $650, and that wasn't even top-of-the line. The same car is half of that or less here on the east coast. The lease manager at my dealer told me that his brother in TX is paying $100/month more than I am for the identical car, and close family members get a substantial discount.
IDK if you're at all familiar with Ford's discount pricing plans. There are various classifications, depending on relationship. It's explained here. You can check if you are a member of an organization or are employed by a company that offers Ford X-Plan pricing as a perk. If you're not, you can join the Mustang Club of America as an associate member at a cost of $25 for 1 year. After 60 days as a member, you're entitled to 1 X-plan PIN. Another organization that offers Ford X-Plan is The Experimental Airplane Association. You can join for $40/year. The cost to join these clubs is well worth the benefit. When you present the X-Plan PIN to a Ford/Lincoln dealer, there's no negotiation. The price comes directly from Ford and a printout must be shown to you. Some sharp buyers may be able to negotiate a lower price, but not by much. Moreover, the amount that the dealer normally adds for documentation is capped. This can represent a significant savings. Plus, the hassle of negotiating is eliminated. That's important to some people (me included).
The number you were given is nowhere near reality. In my own case, my 2017 MKZ had an MSRP of $52G+. I put no money down. I've never put any money down on a lease. However, I did pay the sales tax up front this time. With X-Plan, my monthly payment is $473. I don't remember what incentives were available then, but there was a previous Ford Red Carpet Lease customer rebate. I don't remember how much that was, but it may have been $1G or less. I'm thinking that incentives should be better now since they should be looking to clear out 2019s as the 2020MY begins.