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Bostonboy: the thing is, that though it doesn't happen over night, if you slowly tear down these buildings for the sake of towers, its just a matter of time before you don't have any left (and then you're left with a bunch of new buildings, not unlike dallas or houston), so though in your eyes its just "one old building", its a slippery slope. There's plenty of space for new buildings (SBW, turnpike air rights, sw corridor, soutbay, kendall square, fenway, and plenty of parking lots and strip malls that could be better utilized), lets fill those up before we start talking demolition.
Which brings me to Bobby's concerns. A place like NY has VASTLY more real estate to work with, and not only that, but its for the most part fully built out and is therefore much more sensible to build upwards. Having said that, I don't doubt that NYC has plenty of nimbys protecting certain parts of that city, its just, as outsiders, i'm sure we don't hear about it. Of course, they still have plenty of construction going up anyways. In places further out west, or in the South, as newer cities, they likely have less to protect in the first place.
Its all a question of scale, and boston's scale is what makes it special in comparison to most other american cities. In my opinion its a worthwhile goal to protect and preserve that aspect of Boston. But that doesn't mean that the development climate in boston can't be improved. Incentives for building on parking lots, turnpike air rights etc should all be considered, with height allowed where prudent (kendall square, turnpike air rights) but proper scale kept in most places. The problem in my opinion is that there simply aren't any rules (or not the right type of rules) in place. Seems to me that in boston, development takes a case by case basis. Clarifying what can be built where would go a long way towards giving developers the financial stability to push projects through. Right now, development parcels fetch a high price because of the possibility of building big, and once purchased, the developer finds out that their desired project cannot be built as desired and we're left with "luxury condos" in cheap, short and squat block busters, or worse, with a parking lot (hayward lot?)
Of course, this should be the job of the BRA, but they simply don't do it.