thanks '77! nice find, I hope that's what's going on there
here (large photo) also is a pretty good overview of the parcel's location and its relationship with a bike-friendly greenway put in as part of the 888 Seventh project. if you follow the green line in the bottom part of the photo upwards to a street (Berry) and hop over it, you can see how the corner on the other side rather lines up with it, leading to Seventh.