I just bought in November. My condo originally had an asking price of $116k, she dropped it to $109,900 after 45 days. I offered $106k and she countered w/exceptions and I accepted. My agent, who had some experience, said 5% off was an acceptable offer but it depends on your market and how fast properties move. Have your agent or access the MLS and get a couple years worth of listings/selling prices for the area where you are looking.
cliff's answer: $25k off is 10% which is bordering on lowballing but it all depends on your market. If you're gonna lowball, ask for all of the appliances, the family pet and a couple nights with the spouse... :beer:😀
edit: when you look at the final sale prices, also check how long it took those properties to sell and how much they were discounted from asking price. Each property is different; my condo is entirely finished except for patching nail holes where pictures were once hung. Some of those super-cheapies that sold previously may have needed a ton of work.