A pair of developers say they will soon file plans for the first phase of their proposal for three clusters of buildings with 851 housing units, 200 hotel rooms and more than 1.75 million square feet of life-sciences labs and offices on the western and northern sides of Sullivan Square.
The proposal by Boston-based Rise Together and Trax Development will require the demolition of numerous existing buildings from the Somerville line to the Mystic River along Cambridge Street. When done, the developers promise nearly six acres of parks around Sullivan Square, which most people outside the area now know mainly as a traffic-clogged rotary on the way to somewhere else.
The proposal is the latest in a series by different developers to transform Sullivan Square. In addition to the ongoing Hood Park development, a developer has proposed a 29-story residential tower at Mystic Avenue and Dorrance Street.
In a letter of intent filed with the BPDA, Rise Together and Trax say the first phase of their work will focus on several parcels, totaling 6.3 acres, along Cambridge and Roland streets from the Somerville line to just past I-93, where they are proposing 160 housing units and 906,000 square feet of life-sciences space, as well as new parkland and a "shared streetway zone" for both pedestrians and motorists along Roland Street.
They developers are calling this part of their project Inner Belt, a name more commonly used in neighboring Somerville for the land left over from an interstate that was never built. The complex will wrap around the Tavern at the End of the World on Cambridge Street, which is named because it's the last watering hole before Somerville, isolated from the rest of Boston by the I-93 deck, to which the Inner Belt Highway was supposed to connect. Also planned: Green space from Sullivan station to Hood Park.
The developers say this work will turn Charlestown's forgotten corner into a "lively, walkable realm," that, when coupled with a Green Line Extension station just a ten-minute walk away in Somerville, will make the area "a key link between the lively, economically vibrant urban hubs of Kendall and Union Squares."
This cluster will then join up with another cluster at Cambridge and Spice streets. The third cluster, to be called Mystic Square, will include land from the Alford Street bridge, down Arlington Avenue and Temple and Sherman streets.
In their letter of intent, the developers said they will file separate plans for each of the three clusters, but that they expect to work with a common "impact advisory group" of local residents, appointed by the BPDA, to oversee planning for all three projects.
Inner Belt filings and calendar.