You can see the story regarding the proposal here. This is a rendering released later on:

A rendering of the proposed 45 Stuart Street tower.
Source: Boston Herald
Filed under: 45 Stuart Street, Boston, Massachusetts, Mixed-Use, Proposal, Theater District
this is a beautiful tower, it looks to be around 350ft tall which is perfect for that area,,
The tower is actually only slated to be about 290 ft. I wish it was a little higher, but developers need to get a special zoning to build even this high in that area.