The health aspect of power lines is an inevitable issue in buying a home, especially if the property is near a “drop zone.” Whether there is sufficient evidence to support contentions of health risks associated with living near electric towers is not the point here. Rather, it is consumer perception that will always prevail, and if a buyer entertains such health concerns, he will have second thoughts about buying a home that is adjacent to power lines.
The “eyesore” factor and the extent to which it comes into play will depend on how attractive the other features are. Some buyers may be willing to overlook the power lines near the home he is buying if he sees more important benefits such as good schools, quality construction, unique features, or even great neighbors. It is a trade-off exercise dictated by buyer preferences.
Lastly, how difficult is it to re-sell a house near electric towers? Well, the owner/seller knows exactly what issues will be encountered by potential buyers, having been a buyer himself. Health. Cosmetic. Additional concerns such as value and length of marketing time will have to be taken into consideration, and sellers should be prepared. Expect that there will be buyers who will pass on this house for concerns stated above, and it may stay on the market for a longer period of time, consequently putting a downward pressure on the price.
This home is nicely upgraded and could probably sell for $900k at a different location without the power lines. I agree, that you should try a low ball offer in the high $700k even. I doubt that anybody will pay the asking price.