The Boston Transportation Departments will temporarily widen sidewalks at Franklin and Arch streets on Tuesday morning.

There's so much winning going on in Boston right now, what with fresh development adding?thousands?of?apartments,?condos,?hotel rooms, and?dorms city-wide; passionate debate about the future of neighborhoods; fabulous new architecture,?public art, and parkland; and just a general acknowledgment that all the change afoot seems as manageable as much as it seems inevitable. Some Boston neighborhoods are changing faster and more than others, with five in particular that may be?unrecognizable?a few years out.

The Millennium Tower is the city’s tallest and chicest apartment building yet and is on track to sell out before it even opens. There are already sale agreements on more than 90 percent of the 442 luxury condos. With opening day set for next summer, that gives the developer plenty of time to make deals for the remaining 40 or so units.