Start at the swings and walk south, across Brown Street onto 18th. Stepping from the park to its neighborhood, you’ll find a stretch of blocks unlike any in Milwaukee. There’s a scattering of classic, 100-year old Milwaukee houses, but a majority of the homes are of a style that would be more familiar to a suburban subdivision. And still, a few vacant lots dot each block, spots where structures once stood with nothing taking its place. This is Johnsons Park…