The developers behind Watertown’s Arsenal Yards project are seeking to swap uses in an 8- or 9- story building that sits at the south end of the site, overlooking the Charles River.

Originally envisioned as a residential tower, Boylston Properties and The Wilder Cos. are proposing to change site G within the Arsenal Yards project to life sciences space. The updated proposal calls for an 8- or 9-story building to include around 155,000 square feet of office/lab space and a parking garage. A path would link to the Charles River with a community park next to the building.

The development team hopes to begin construction in spring 2020 with completion in 2022.

In addition to the new building, Arsenal Yards will feature 350,000 square feet of retail and entertainment, a 145-room Hampton Inn and Suites by Hilton hotel and at least 100,000 square feet of office space in addition to residential units. Retail at Arsenal Yards will include a 30,000 square foot specialty grocer, a cinema with 6-8 limited-seating screens, active entertainment, a combination of boutiques and national retailers, half a dozen chef-driven restaurants and a premium wine superstore.