In one of their rare turns in the gbNYC spotlight, Jamestown Properties is acquitting itself well. Jamestown recently announced a commitment to do up to $10 million worth of green retrofits on its entire U.S. building portfolio. Given the size of Jamestown’s $4 billion portfolio, that’s a lot of buildings, with such major New York City properties as LEED Gold-hopeful 1250 Broadway and Chelsea Market among them. While Jamestown isn’t doing this out of the goodness of its Multinational Corporate Heart — they’ll make their money back through energy savings and higher rents and sale prices — their choice carries with it a number of heartening potential effects. In the Times, Alison Gregor explains the possible curve-bending effects of Jamestown’s decision to green its fleet.