So over across the street from Block 23 construction site is a small Whiting Turner fenced in site which has a single wall with windows and things. I believe this is the practice mock up site for the Block 23 building. Recently they put the façade on the little wall. Here is a picture. Sorry about the terrible quality next time I walk the dogs by here I will try to get a better picture.
Here is where the location is circled in red from google earth.