this phase is a residential tower, and the contractor you sourced lists it as a commercial building (also the rendering definitely looks like an office tower), so it’s likely that’s an outdated scheme. Here’s the thread: NEW YORK | 511-517 West 35th St | 580 + ? FT | 44 + ? FLOORS - #36 by JC_Heights
edit: then again, this diagram that was on cityrealty seems to confirm the design.
