u/Beneficial-Living-19

My family and I are looking for a new rental and have been approved for a townhouse. Upon getting back to us they told us because of our credit they want the following:

Deposit: $2,400

Rent: ($2,400) prorated for the month minus $500 (a special they run)

Additional: last two months of rent, $4,800 total

I know they can charge first, last and a deposit but what about a secondary last month of rent? Clearly insane to ask, but is it legal?