found it. i'm such a nerd.
i noticed it's on a 4-lane street, and based on the shadows i figured it must be oriented N-S. then i just checked for locations on major N-S streets with an L-shaped building with a white roof facing the NE corner of the block opposite (based on the "bird's eye" view). the apparent street grid had me confused; spent a long time looking around gateway. ah, google earth!
so here you go - large vacant lot at 181st just N of Burnside: