Are you talking about buying or renting? I've never heard of a property management company negotiating on the rent amount. maybe if you're dealing with the owner directly and they're having a hard time getting renters, you MIGHT be able to get them to come down a little. If you're buying...i'd ask your Realtor to do a market analysis. If you're in a hot seller's market you might have to pay ABOVE list price in order to get it! Good luck!