The Academy property is a waiting/baiting game to see if MassHighway redoes the 8-headed monster Mountfort/BU Bridge intersection into a compacted single-point intersection with turning lanes to get rid of the lane sprawl and gridlock from being caught between two signal cycles.
The state is keeping the door ajar for coming back and doing that, and if they do the compacting of the distended BU Bridge turn lanes will allow for a full-width sidewalk in front of the Academy commensurate with the next block over, and serve up the land for BU to mass right up against that expanded sidewalk. That's definitely a net gain well worth sitting tight and waiting for, because even if they filled Lot H with something big right this second it would be set awkwardly further back from the street and have to be fronted by that godawful squished sidewalk and pure-chaos U Rd./BU Bridge crosswalks...so it's never going to mesh as elegantly with the street as 808 on the opposite corner.
That's one where if the intersection fix is in still in a back-and-forth negotiation state it is MUCH worth waiting for a final road design before turning loose an architectural concept for the parcel. Even if it takes till the mid-20's for that to come to pass. Centrally located anchor parcels aren't easy to come by. Would you rather they shiv it off-center onto one of the city's worst FAIL intersections now and have it be a forever square-peg fit with serious access downsides...or try to coax the intersection fix first then get the redev really right? With no second chances, I'd rather they pull out all the stops to get it really right.