"According to urban planner Richard Layman, a long-time chronicler of new restaurants’ relation to shifting neighborhood demographics, Thai eateries are generally among the 'second wave' of retailers to set up shop in an up-and-coming part of town. Mexican, or Tex-Mex, usually comes first, in Layman’s view. But Thai is an increasingly prevalent indicator of change, he says."
—Understanding gentrification by new restaurants. (We presume the Mexicans take over the leases when the Chinese plexiglass-window places close up; see also Williamsburg, 1996.)