If it is new construction, it probably refers to the type of finishes in the kitchen, such as frameless cabinets where the doors are flush with the box and the hinges are hidden. It would include granite countertops or a natural stone one. These are sleek (modern) and may feature everything lined up on one wall. Many include a kitchen island, too. However, if it is an older community, they be using that term to mean: smaller space with cabinets that are not "built in" but have a frame around the cabinet doors. Freestanding cabinets can present a certain charm so it just comes down to taste. Sometimes, this term is simply applied to an older property without natural stone countertops (think laminate) that may also have a washer/dryer in the kitchen. Think galley kitchen, a tighter space.