So from what I can tell, including from Shmessy's quote, is that this building may be fully (or nearly) within all zoning limitations for the site, and therefore may have a quick path to breaking ground. There's going to be a musical chairs dynamic at some point, and as a developer you don't have to be in the best seat when the music stops but you absolutely can't be left standing. This site is zoned commercial/light industry and so getting housing for this particular site would have probably been harder than a lab that's within zoning regs.
If these guys can front run the competition, get this open before some competitive new lab space that is still getting their ducks in order, they may be banking on speed and picking up what's left rather than just entering a super underserved market.
Just look at next door at the huge Channelside project. It's approved, required a large number of variances (and endless neighborhood meetings), and still hasn't broken ground.