Parisian street art pioneer Blek Le Rat has landed in San Francisco and yesterday afternoon blessed the exterior of the Tenderloin-located White Walls Gallery with a site-specific take on one of his “Beggars” stencils, similar to the works London residents may remember from ’07.  His joint show with the artist Above will debut this Saturday at White Walls alongside Hush at Shooting Gallery. Street installation pictures and show preview after the jump.