These apartments have two levels in a high-rise block. One level has a study, a guest bathroom, the living, dining, kitchen and utility area, and maid’s quarters. Upstairs will be two or three bedrooms and bathrooms. A storeroom may be either upstairs or under the stairs. These make spacious homes and often have terrace gardens on the roof. But they can be expensive to heat and cool because of the depth of the apartment. Prices start at around $60,000.