2016 highlander xle awd dealer rental

I got a great price on a highlander xle awd
Msrp:40,517
Sale price: 33,663
I told em I wanted to lease it, at first they said “shouldn’t be a problem”, then they call me back and tell me it’s a dealer rental,and it can’t be leased…
I asked them why not… And they said "well, we can lease it… But only when it’s the last 2016 we have left…
Can anybody here help me with this? Is this all true?
Does anybody know how depreciation works on a dealer use highlander?