I suppose if you pay $1.8 million + for the land, you'll have to charge a lot for your spec house, but $5 million on Mallard?

Well, maybe, but if 42 Mallard Drive does get its $5.2 million asking price, it will certainly break the record for that street. Here are the previous highest sales from the past 10 years. Obviously, the market has skyrocketed over that decade, and perhaps the appeal of living on a speedway has increased lately, so who knows?