Unfortunately, you cannot determine negotiation by percentages in this fairly volatile current market. Each property is priced according to location, condtion, size, quality and finish. Not all properties are priced to be discounted-the market hype in the media is just that HYPE. All real estate is local. A good agent is essential to navigating the area that you are searching in. Interview your prospective agent and ask them to define their experience and knowledge in the area you are searching. Any agent with experience knows their market and can direct you on the price of the property you are considering. If they cant, you should look for another agent. I am active in the tristate area Prudential network, grew up in New Jersey and would be happy to refer you to a reliable resource in Newark.