Lots of threads here regarding the Maserati Ghibli, just type maserati on the search box. There is at least an hour of reading available. Most of it due to the $488/mo deal of the century lease. Even that deal of the century cannot get you to under $500 if you include tax.
The only direction I can point to you is to find a base model on a dealer website (get the VIN) and see if you can get a discount of $20-22k off MSRP. If the car has been sitting there for a while, who knows. If you can get that done, you should be able to get your payments for $500 + tax with $0 down 36/10k. The low residual make it a very hard lease (under 50% foe 36m), MF is pretty good.
Base model is ~$72k.
Outside of the “deal of the century”, this is the one of the few well negotiated deals by @mplin in SoCal for a non-base $77k MSRP. Still ended up $601 + tax = $653/mo ($500 down) 7500 miles/year