The value of Milwaukee properties within a quarter-mile of the new streetcar route have skyrocketed by 28 percent since the project was approved three years ago. That’s more than double the increase for other Milwaukee properties. The Hop starts serving passengers next month. City officials say there has been new construction and a lot of investment made near the stations where passengers will get on and off The Hop. It will run seven days a week, stopping for passengers every 10-to-15 minutes.