The dealer is in business to make money. If they throw out a $600 a month lease payment and you agree they will certainly take it.
The best thing I'd suggest is 1st figuring out which engine and package you are looking at. This may mean test driving a couple models. Once you are certain you know what trim level you are interested in use the search function in this thread and see if you can figure out what others are paying for that same trim level. For my leasing experience I came in with a Circle-A certificate from R-Spec that lists the starting price without any additional incentives for the exact car I was looking at. You'll need the car's
VIN number to get that if interested. Leasing in October 2019 the lease cash on a 3.3 Sport AWD was $5000, then there was a competitor incentive of an additional $1000 for owning an Acura. Id seen others in this thread that had similar discounts so had a pretty good idea of what a fair deal was. Upon getting that initial high monthly figure I usually say something like "Wow, I did a lot of research on this car and I'm sure I've seen others get it for X amount a month on this model" I have found once the salesman knows you have done a lot of research they are likely to work with you. Its here I lay out what all incentives I'm expecting then let them come up with a monthly. If it sounds right then we are good. If its still too high youll want to verify the money factor they used to calculate the monthly to make sure they didn't jack that up to compensate for you being an educated buyer. This forum can literally save you thousands on your G70 if you take the time to research.
To summarize:
Get an idea of which model best suits you
research what others have paid in this thread
Know your lease incentives and lease money factor from Edmunds. They change monthly.
Get Circle A from R-Spec once you have a specific car in mind. (If he is still providing those)
Good luck!