Construction on the first phase of this five-building, 1,300,000-square-foot project could start in the spring of 2017. That phase would include 313 of the approximately 550 residences planned for Fenway Center.

Plans call for an 11-story, S-shaped building dubbed the Viola after the nearby Berklee College of Music. The project will encompass the Hynes Green Line station. Above will be 173 apartments and condos (roughly half and half); a four-star, 156-room hotel; 26,000 square feet of retail space; and two public plazas. The state will use rent from the developer, the Peebles Corp., to seriously upgrade the T station. Peebles hopes to start construction in 2019.

At least two unspecified developers want to take another crack at Columbus Center, the original plan for which collapsed in 2010 due to local opposition and financing challenges (including the formidable task of building over the Pike). That plan included a 35-story tower built on decks over the highway.

Developers Adam Weiner and Steve Samuels want to build a 559-foot condo building and a 24-story apartment building on this site, the air rights to which they bought from the state in 2013. The pair had originally planned a single tower of about 400 feet using these air rights and those of a nearby plot that they also acquired from the state. Per Tim Logan in the Globe, Weiner and Samuels recently decided to expand the project into a multi-building plan over the two sites.