I found this in the DPIR.
The Project, as shown in Table 2-1, will be an approximately 605,000 sf, 59-story mixeduse building that includes approximately 419 residential units and approximately 30,000 sf of retail space on three levels, one below-grade. The height of the Project will be 683 feet, conservatively measured from the lowest elevation of the Project Site 1 . The mechanical floor and equipment (plus enclosures) above reflect a total building height of 705 feet. This is below the 710 foot high threshold set forth in Massport’s “Composite of Critical Airspaces,” and thus the Project is expected to meet all applicable FAA and Massport requirements with respect to navigational safety.