Hassler flips burgers on a grill in the shadow of the remnants of the Seattle Gas Light Company, a collection of rusted cylinders and ironwork that looms in the distance like the ruins of a steampunk skyline. The expanse of emerald grass runs down to the edge of Lake Union, which sparkles under the late afternoon sun. It's June. It's warm. The entire city seems to be out taking advantage of this rare, perfect day.