Secondary suites are often efficiency or two room apartments but always have kitchen facilities (which is usually a legal requirement of any apartment). Microapartment: rather common in the same countries where microhouses (above) are popular. These small single-room dwellings contain a kitchen, a bathroom, a sleeping area, etc., in one place, usually in a multistorey building. Officetel: small apartment providing a combined work and living area in one place, especially in South Korea. One-plus-five: a mid-rise apartment or condominium building consisting of four or five wood-framed floors above a concrete podium. This type of construction exploded in popularity in North American cities in the 2010s. Penthouse: the top floor of multistory building Plattenbau (East German) / Panelák (Czech, Slovak): a communist-era tower block that is made of slabs of concrete put together. Q-type: townhouse built mainly in housing estates in the UK beginning in the late 20th century. The houses are arranged in blocks of four with each house at a corner of the block. Similar to the earlier cluster house (see above). Railroad apartment (or railroad flat): a type of apartment in which rooms are directly linked, without hallway separation, similar to a line of railroad cars. Rooming house: a type of Single Room Occupancy building where most washing, kitchen and laundry facilities are shared between residents, which may also share a common suite of living rooms and dining room, with or without board arrangements. When board is provided (no longer common), a common dining time and schedule is imposed by the landlord who in such cases also serves as an innkeeper of sorts. In Australia and the United States, any housing accommodation with 4 or more bedrooms can be regarded as a rooming house if each bedroom is subject to individual tenancy agreements. In the U.S., rooming house lease agreements typically run for very short periods, usually week to week, or a few days at a time. Transient housing arrangements for longer term tenancies are implemented by a "rider" on a case-by-case basis, if local laws permit. Rowhouse (USA); also called "Terraced home" (USA); also called "Townhouse": 3 or more houses in a row sharing a "party" wall with its adjacent neighbour. In New York City, "Brownstones" are rowhouses. Rowhouses are typically multiple stories. The term townhouse is currently coming into wider use in the UK, but terraced house (not "terraced home") is more common. Shophouse: the name