The answer is in your state landlord tenant regulations. You will find them on line.
It is your responsible to know all the regulations as a landlord dealing with tenants.
1st month, of course. 1.5 rent for security. Not last month. And, yes, I have had tenants refuse to pay the last month of rent, leaving me 1/2 month as security for damages.
Yes 1.5 months security is legal in NJ. First and last is also legal.
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