Three aging buildings at Boston Properties' North First Business Park are being cleared to make way for a brand new tech campus that could have up to 1.5 million SQFT of office space across seven buildings between 5-11 stories. However, it looks like these will likely not be built speculatively. Boston Properties is waiting for an anchor tenant before beginning construction.
There would be some retail included as part of the project along North First and some of the parking will be underground. The new campus will either be built in two or three phases depending on how large that first anchor tenant is. More details in the source link below.