If you’ve driven north on Delaware Street toward 16th, you’ve seen this billboard. But did you notice the Herron-Morton home behind it? The house is for sale, and it’s one of the most interesting listing I’ve seen in a while. In terms of cost per square foot, the 1904 home is probably the best deal in the neighborhood. It has three levels and a basement for a total of 4,300 square feet. The price: $185,000. Of course, there are downsides. The owner plans to retain rights to the billboard, so you wouldn’t have control over what your house is advertising. And at night, headlights glare into the front room. The home is owned by Clear Channel. “They had to buy the house to get the sign rights,” said Larry Bray, the Tucker real estate agent listing the property.