Call it the "revolving door syndrome." As soon as a Williamsburg gallery finds a modicum of success, it moves across the East River to Manhattan, or so it sometimes seems. Most recently, both Plus Ultra and Schroeder Romero galleries announced plans to move to the new gallery row on the ground floor of the Terminal Warehouse at 637 West 27th Street in Chelsea. Black & White Gallery is opening a second space in Chelsea in the spring, said dealer Tatyana Oksteyn, while continuing to operate its current Driggs Avenue location as a "project" space. In the last year or two, Bellwether, Jessica Murray Projects, Priska C. Juschka, Monya Rowe and Sixtyseven galleries have similarly made the move to Manhattan’s burgeoning Chelsea art district.