The zoning for this parcel is 120' height (basically same as Tower Records) with a FAR of 8.0.
The real issue is the structural considerations related to the placement of foundations and the awkward site layout. The Boylston-side of the parcel and the Mass/Boylston corner are severely skewed and offset to the Pike and rails, but the parcel does not extend to the Pike median or rail/Pike median in many places and already contains bridge foundations in other places. Coupled with the limited area for foundations this severely limits the size and placement of loads within the floor plate.
All of these points can very easily be seen in the
feasibility study and
presentation produced by Parsons earlier this year. Additional points were also discussed at the March CAC
meeting with MassDOT presenting the study.
Further considerations include: keeping clear of the station's pedestrian concourse which further limits column and foundation locations. The study also refers to the objective of limiting changes to the existing bridge structure further limiting options to increase structural capacity.
Finally there is the issue of condos with southern windows in the Tower Records building which would be impacted by anything over 3 stories
directly south.
It's not clear to me that the RFP limits the developable area to 320k SF. I believe the press release is mistaken. I believe this figure only represents Option A from the feasibility study which was limited by structural considerations. Even Option A puts a 15 story massing (higher than allowable as of right) in Zone 3 where the foundation is most easily dealt with.
From a structural point of view the feasibility study puts the SW corner (Zone 1) at 3-4 stories, the central area at 6-8 (Zone 2) and the NE section at 20 stories (Zone 3).
This parcel is unlikely to yield great economics to MassDOT with the limited SF, expensive structure and need to pay for the station renovations and lost space due to public areas there is just not a lot left for lease payments.
There is always the possibility to engineer your way out of these challenges. But that can negatively impact the economics. The use for this site is going to be residential, dorm, condos or hotel over retail (with significant public space). So that further limits the programming impact on the economics.
The previous
proposal for this parcel (Trinity) had 280k SF and 6 to 11 stories. And this proposal did not cover the entire MassPike. There is not going to be a proposal for 20+ stories on this site particularly at the Mass Ave corner.