When selling your home accept the first offer you receive. Why? The longer your home stays on the market, the less likely you will receive a full price offer.
Most new construction homes have a Mello Roos tax. This is in addition to your regular property taxes and homeowner association dues. Make sure you ask what the Mello Roos tax is in your area.
Don't submit a "LOW BALL" offer unless you're willing to lose the home. A seller doesn't have to give you a counter offer and by submitting a low offer you run the risk of offending the sellers.