I believe you have to judge this case by case. Your broker should do her or his due diligence and research when the property was purchased and what the sellers paid for the property , then research the current sales in the building /area . Each situation is different ,when you buy from a sponsor the negotiations may be different then buying a resale apartment . Some owners may need to sell more then others so they will accept a lower offer. I try to judge the situation, do my research and then advise my buyers what to offer. You also should be aware that even if your offer is accepted until you sign the contact and the seller signs the contract the deal is not firm. i believe today the key is skilled negotiations and having as much information re the property as possibe.
Certified Buyer Representative
Century 21 Princeton Properties