There once was a hood known as S.L.U. That, like a fertilized plant, grew and grew, Thanks to a software king Missing a Super Bowl ring To complete his collection so shiny and new. Now instead of icky, litter-filled lots You’ll find hot parents and hipster tots, Lofts with modernist moods, And a brand new Whole Foods, Plus legions of singles (Madison Park clearly it’s not). But the burg Vulcan built still lacked something Amidst REI and shops cute as dumplings. That something was this: A sanctuary called Spa Blix With stress-busting services (no happy endings). The just-opened spa meets every whim With homey ingredients (lavender from Sequim). Furnishings are French shabby chic. The VIP room? Worth a peek Before luxe sugar scrubs baby your skin. With pluses like nontoxic paints, there’s no catch. It’s a sustainable green building, natch. Monthly donations to charity — no skimping — Mean you’ll feel extra good about primping, Even as they’re waxing your … legs. Spa Blix, 213 Yale Avenue North, Alley 24, South Lake Union (206-274-5681 or spablix.com). Soft opening today, full menu available Saturday.