As disappointing as this seems to many at 691', it was never going to be able to get more than maybe 1 floor taller. Granted, 700'+ is a nice mental barrier to break, but the FAA really precludes height here.
We'll probably never see a Philly-type skyline like I saw on the previous page, but this is why we need to really scream for height in the few places where height is actually possible. Hurley should be going mid 700's instead of a 400' cap, to help lessen the outsized impact of a future 800'+ in the area. The Hynes convention site would be perfect for breaking 900' (Liberty Place 3 anyone?) and also going tall at the Kings parking garage would be prudent.
Otherwise we're forced to rely on Cambridge, and they don't seem to have the appetite over there although maybe that will change once Volpe and MXD both go over 400'. North Point would have been a perfect location for an exclamation mark of a tower, but they arbitrarily capped that at 250' and unintentionally made the entire area both overly oppressive while remaining woefully uninspiring. Constellation Center coulda woulda shoulda shot for the stars, instead of being the same height as literally everything around it (just under 300').
I really don't see where else we could go very tall. Unfortunately the area that makes the most sense, that being the financial district, has both strict FAA rules as well as shadow-on-the-parks problems.
It still blows my mind that Boston Properties goes 1070' in San Francisco, while shortchanging us height-wise in 2 key potential areas to go tall, at the Hub residential site and Back Bay Garage. If you study the FAA map we honestly have so few sites that could potentially surpass the Hancock; this is why I blow my top every time we under-build on another one! People say I just scream for height but I am realistic. We're not going to level the old neighborhoods, nor should we, so we are extremely limited in options. I wish people cared more. As we're seeing here, a 400'+ building is barely even noticeable, while a new tallest would literally redefine the city. If you think this one is disappointing, just wait until the fat slob 400' version of 1 Bromfield is built, instead of the futuristic, slim, curvy 709' version.
Unfortunately, I too see the trend of putting up some (pretty) tall buildings coming to a screeching halt after South Station Tower. As I'm pushing 40, I just hope that I can live to witness a new tallest built in this city. In the meantime, our wholly overrated/mediocre sound-alike city Austin TX is currently constructing an (ugly) upper 800's and has a 1000'+ tower expected to be built next year. It's amazing how we have been building so much relative to what we're used to, and yet are barely treading water on the national stage on top of annually falling behind multiple other international cities nobody's ever heard of (hyperbole but who knows more than 10 Chinese cities?). Even European cities, like Warsaw, are outbuilding us and pushing for heights that "soar" too much to ever be built here. Australian cities are going for broke (Melbourne, Sydney, Brisbane, Gold Coast). Both Mexico City and Monterrey have supertalls coming/built and it blows my mind where the demand is coming from in some of these cities. South American cities too, like Bogota, are building like crazy. I feel like I would be a lot more satisfied with what's going on in Boston if (A) I didn't know about all these other cities, and (B) I didn't have to witness half of the major expected projects here either fail or be downsized. From a skyline perspective, a proliferation of labs and NIMBY's does not equal keeping up with the Joneses, at all.
On a positive note, once South Station Tower is done I finally expect the skyline to "level up" in the sense that it will be head and shoulders better than what I was used to from the mid 1990's on. We'll have gone from 2 buildings over 200m to 6, and 5 over 600' to 10. Every angle of downtown will not only have, but essentially be dominated by, a minimum of 1 of these new buildings. It's going to make a huge difference. I think we'll all be very satisfied for a couple years with that new skyline configuration, before the restlessness really kicks in by the late 2020's!!!!!