Re: General Electric HQ | TBD | Innovation District
Indeed the easiest way to discourage retailers from staying on a street is to eliminate on-street parking. If the person driving by, doesn't see a place to park for that quick errand -- they wont stop, and eventually the retailer will go for lack of customers.
Your thinking is straight outta the 1970s--a time when there were half as many registered vehciles are there are today. [Or you're picturing Lexington Center (Centre?) as if its somehow analogous to the Seaport]
And yet even then the argument didn't hold: the only study I'm aware of was by William Whyte who observed actual turnover and followed people as they left their cars. It showed that a big slice of the retailer's trash talk on this subject was because street spots were being used by shop owners and employees, not a commercially-critical % of customers. (and these non-customer parkers would repeatedly re-feed the meter to defeat then-available technology for encouraging "shopping" turnover)
Retailers call it "foot traffic" for a reason and in dense Central Business District settings are under no illusion that anyone drives to their stores. There is no such thing as popping to any CBD by car to buy an ice cream cone, nor should their be. Nor is any retailer going to locate in the Seaport for anything other than office-worker traffic which is entirely accessed by foot.
[Newberry street is an edge case, but arguably, as a neighborhood of brownstones, does not have the same immediate density anywhere close to the ~10stories+ everywhere Seaport will have. I'd also argue that the even Newberry no longer gets/needs the drove-from-the-burbs traffic because of traffic (not parking) so parking is probably bad for the real shopper's modes: Uber & Foot)]
Sure, I'll give you a spot for any limited specific use you can name: handicapped, delivery, ride pickup/drop, bus, and any flowing use you can name (bike, bus, or unrestricted). But this "hey, you never know" kinda parking is unsupportable, and the reality is that spontaneous car trips are a suburban thing, not a CBD/Seaport thing.
On major arterials, of course, you don't allow parking during rush hour -- that is easily taken care of by meters that don't accept payment say from 3 to 6 PM or 6 to 9 AM depending on flow directions.
All you have to do is look at Mass Ave (a major arterial) through Porter Sq at rush hour to say that, as "obvious" as it should be to remove about 10 parking spots through the pinch points (from Roseland/Lesley U to WaldenSt/Henderson Carriage), somehow we haven't managed to do so. Those 10 spots "convenience" probably, at best, 40 trips during a 180 minute rush hour, yet clog a key bus route that 's probably handling 800 people (call it 800 delay minutes) and inconvenience at least 50 "local" trips that start/end at Porter.
To the extent that these parkers are not employees, they are people doing trips that could have been handled on the 77 or 86 or 96 bus. Same is going to be true in the Seaport. Thousands of delay-minutes are being imposed on hudreds or thousands of street-travelers for the sake of saving a few tens of parkers few tens of minutes. That's how you know it is a market failure. Ain't no way those few parkers would outbid those hundreds of travelers in any kind of efficent market for lane-foot-minutes.
Its more likely that stores would profit from commuters whose commutes were smoother/faster/less-stressed than from a literal handful who might pop in or out of spots.