This office building is nice; but too small. Mixed use, all the way and lets called the STV BS ('put all the tall towers on Agricola and Quinpool') and really go for it. Mixed use, some big box format stores as the ground floor occupants like in
Vancouver and crank the density to the max - 30 to 35 stories. If the STV crowd are going to harp that this is the appropriate place for 'towers' then lets build some towers and put in a streetcar to give them an option on how to get to and from work.
I'd suggest a route from the Hydrostone (because if you put high frequency transit it there, it would encourage bigger developments and I would think encourage policy to be adopted to allow for it - so no more knocking off 2 floors to keep buildings under 10 storeys because it's too tall) down Agricola to Hollis Street and double back via Lower Water Street.
Like I said - if they are going to make the case that this is a more appropriate place for towers, then lets put them there, but to heck with this 10 storey non-sense. Mega Density, all the way.