Yeah, Fishy, it's a mushroom.
The alley where this wayward art can be found used to hidden behind a gas station and doughnut shop. Those have both been torn down to make way for a condo tower, so the once-dark alley is currently now open to the street.
As long as I've lived here, that alley's always had a small-town bad-kids'-hangout vibe about it. Not a place for serious gang business, more like a spot where blow jobs are be traded for party drugs. The gas station and donut shop, respectively, were called -- I kid you not -- Beaver Gas and Baker's Dozen.
If you want drama to stop following you everywhere, try letting go of the leash.