Seeing Sacramento mentioned in another post about this topic... Most builders in Sacramento have strict rules about sellign to investors. Basically, they don't, won't and shall not do it. This comes from a couple of very good clients of mine who are Representatives for Beazer and Tim Lewis homes. Get caught as an investor on new construction in the area and you will forfeit all your rental income, appreciation upon sale in the first year. Fully enforceable in your purchase contract. And yes, they do monitor and investigate.
We have a couple of huge developments coming in, approximately 20 year planned build. Approximately 20,000 units in all. The rule of thumb is "if you want to invest in these areas, look for someone reselling soon after they bought new construction but don't buy if you're not going to occupy."