At the B4 site, a caucus of empty chairs where the construction trailers once sat

There were construction trailers for quite a while below grade at the northeast corner of the arena block, the site of the future B4 tower, which is slated to be the third constructed around the Barclays Center, leaving only the flagship office tower at Flatbush and Atlantic to languish.

The trailers were removed last week from the site, at the southwest corner of Atlantic and Sixth avenues. A few chairs were left.