Majakka in the context of List of tallest buildings in Finland

A tower block, high-rise, apartment tower, residential tower, apartment block, block of flats, or office tower is a tall building, as opposed to a low-rise building and is defined differently in terms of height depending on the jurisdiction. It is used as a residential or office building, or has other functions, including hotel, retail, or with multiple purposes combined. Residential high-rise buildings are also known in some varieties of English, such as British English, as tower blocks and may be referred to as MDUs, standing for multi-dwelling units. A very tall high-rise building is referred to as a skyscraper.

High-rise buildings became possible to construct with the invention of the elevator (lift) and with less expensive, more abundant building materials. The materials used for the structural system of high-rise buildings are reinforced concrete and steel. Most North American–style skyscrapers have a steel frame, while residential blocks are usually constructed of concrete. There is no clear difference between a tower block and a skyscraper, although a building with forty or more stories and taller than 150 metres (490 ft) is generally considered a skyscraper.

Kalasatama (Finnish: [ˈkɑlɑˌsɑtɑmɑ]; Swedish: Fiskehamnen; literally translated "fish port") is a neighbourhood in the city of Helsinki, Finland. The area is officially part of the Sörnäinen district; and like Sörnäinen, Kalasatama is located a little more than one kilometre north from the coastal centre of Helsinki, near the district of Hakaniemi, and the east side of Kalasatama borders the sea. Itäväylä, which leads in the direction of East Helsinki, runs next to Kalasatama. The Isoisänsilta pedestrian and cycling bridge, opened in 2016, connects Kalasatama to the nearby islands of Mustikkamaa, Korkeasaari and Kulosaari.

Kalasatama is projected to become a rather densely built-up area - about 25,000 inhabitants expected to come there, about as many as in Kallio. In addition, jobs are planned for Kalasatama for about 10,000 people. A concentration of 23- to 35-storey skyscraper towers are coming to the Kalasatama center area around the Kalasatama metro station, which was completed in 2007. Three of the towers, called Majakka, Loisto and Lumo One, and the Redi shopping centre are already completed, while the fourth and fifth towers Visio and Horisontti are still under construction. Construction of Visio began in the end of 2021, and Horisontti was started in May 2023.Kalasatama may be considered the name of a larger area with a number of residential neighbourhoods, including Sompasaari, settled from 2011, Verkkosaari, having acquired residents from the mid 2010's onward, while both Verkkosaari and Hanasaari have continued construction at present.