Cost of fire escape from 3rd floor unit in New Jersey ?

[Mei Jiang]

Hello fellow BPs, Does anyone know what's the cost range of building a fire escape (secondary means of egress) from 3rd floor? NJ department of community affairs issued an inspection violation (green card inspection) on this for a property I am buying.  I am seeking to ask the seller to put an escrow with enough fund to cover the cost of all violations and penalty/fees. Thanks, Jimmy