American Family Insurance says it plans to help solve the Madison area’s social problems — as well as foster entrepreneurship — in its new building, Spark, on the Near East Side. Spark, at 821 E. Washington Ave., has eight floors of offices and a ninth floor that houses the building’s mechanical systems. Its special features include a 10,000-gallon rooftop container that will be used to collect rainwater and use it to help heat and cool the building, and sun shades that raise and lower automatically, depending on the amount of sunlight.