From certain upper vantage points in Boston’s Museum of Science, you get an excellent view of the Back Bay skyline. One time I was up there, surveying the towers, and it hit me: money is blood for buildings.

Every office in all those vast assemblages of square footage needs an occupant. If unoccupied, they start to go to seed; if a building starts to lose tenants, it loses the ability to attract tenants. Money is blood. Every office in every skyscraper needs a supply of money to support it, just as every part of every body needs a stream of blood to sustain it. An office without that lifegiving stream starts to rot. If enough buildings rot, the town starts to rot. I’ve seen rotting towns. They’re not pretty.

But for now at least, Back Bay in Boston has all the life-giving money it needs. Somehow.