Thanks very much to M., who sent in the letter that Sushi Tatsu’s founders were handing out yesterday, the mystery of the Japanese restaurant opening at 175 Franklin is solved. (Well, there’s one still mystery: How long the owner the three Sushi Tatsus in Brooklyn will wait before suing over the name.)

The short version: Tatsuya Sekiguchi and Jean Dupuy plan to open a very high-end sushi restaurant at 175 Franklin (the storefront next to Shinola). Sekiguchi was a chef at the revered Sushi Yasuda in Midtown for 10 years, and he “had always been convinced that he could outmatch Sushi Yasuda by opening a smaller restaurant with more exclusive fish selection….” But wait, there’s more! Pritzker Prize–winning architect Shigeru Ban is designing the restaurant—only the second one he’s deigned to work on in his career. And, the only thing likely to rile the neighbors, they’d like to open a “Japanese whiskey bar and tasting room” in the basement. (Actually, Community Board 1 will undoubtedly complain about the prices.) Plus: There will be a “limited number” of customers each night, so the chef can get to know them, and no tipping will be allowed.

The long version:

P.S. If Masa Takayama’s Tetsu ever opens on Leonard—something that looks increasingly unlikely—this could be extremely confusing.