All City, a graffiti art gallery and pediatric clinic, is located in the former Claremont Theater, a 22,500-square-foot landmark in Manhattanville. The organization’s executive directors, Hugo Martinez, a gallery owner, and Dr. Juan Tapia, a pediatrician, worked with Kaptein Roodnat, a Dutch architectural studio, on the $2.4 million renovation, whose design alludes to a town square and streets: the natural habitat of graffiti. (“All city” is the phrase graffiti artists use when they have painted all five boroughs of New York, including the rooftops, Mr. Martinez said.) The waiting area, above, includes gray cushions wrapped in colorful canvas straps. If visitors “don’t want to sit upright, they can sit any way they like,” said Marleen Kaptein, one of the architects. The first show, “Free Radicals,” is up through March. Framed art sells for $250 to $8,000; cotton-blend rugs start at $1,200. 3332 Broadway (West 135th Street). Information: 212-619-2149; Instagram: @martinezgallery.