The boom area that is 13th Street in Center City is moving south.

I told you earlier this month that Green Eggs Cafe was opening a spot this fall next to the child-friendly Nest gym at 1301 Locust St., former home of Signatures, the strip club.

Now I'll tell you that seafood star Mike Stollenwerk has snapped up the opposite corner of 13th and Locust, which has been Globar, Q Lounge, and Bump. (The sidewalk also bears a marker remembering Officer Daniel Faulkner.)

Late this fall, it will become the new home of Stollenwerk's flagship, Fish, as he moves it from its home at 1708 Lombard St. It is not clear what will happen at 1708 Lombard. The new Fish will be triple the size and will offer a commensurately larger raw bar. Stollenwerk also owns Fathom in Fishtown and Little Fish in Bella Vista.

And there's more. At 1305 Locust St., next door to Nest, the crew from Le Castagne -- that's Giuseppe Sena, Anthony Masapollo, Skip De Massa with Brian Wilson as chef -- are planning an Italian restaurant. Its working name is Ecco.

Before 1305 devolved into a series of forgettable bars and a short-lived seafooder called Pelican Bay, it was the destination restaurant Girasole. (Girasole is now at Broad and Pine Streets in the Symphony House.)

So when you tie in Amis/Vetri humming along just down the way, and Vedge -- the vegetarian spot from Horizons Cafe's Rich Landau and Kate Jacoby -- being hammered out at 1221 Locust St., that neighborhood seems to be well on its way.