a higher education diploma (as of 31 December 2018). Most of the residential buildings in Lauttasaari are apartment buildings. The median size of apartments in Lauttasaari is 63.3 square metres. Most apartments have two bedrooms. Most of the apartments were built in the 1950s and 1960s; apartment construction in the area diminished in the 1970s, until new apartments started being built especially in the Vattuniemi area in the 2000s. 35.7% of the apartments in Lauttasaari are rental apartments. In 2019 the median price for apartments in the postal code area 00200 was 6102 euro per square metre and in the Vattuniemi postal code area 5976 euro, when the median in the city of Helsinki was 4323 euro. Transportation Connection to the mainland There are two bridges connecting Lauttasaari to mainland Helsinki. The Lauttasaari bridge leads from Ruoholahti to Lauttasaarentie, and the Lapinlahti bridge is part of the Länsiväylä highway leading west from Helsinki, located to the north of the Lauttasaari bridge and built in the 1960s. Upon completion the Lapinlahti bridge was the longest bridge in Helsinki at the time. Before the Länsiväylä highway was built the street Lauttasaarentie was part of the main road leading west from Helsinki. The street Jorvaksentie, the predecessor of Länsiväylä, started from its western end. In the 1950s the original Lauttasaari bridge from 1935 was seen as far too narrow, and it was dismantled in 1967, two years after the highway bridge to the north of it had been completed. The current four-lane Lauttasaari bridge was built in place of the dismantled bridge. Public transport Metro The Helsinki metro has two stations in the district, the Lauttasaari and the Koivusaari stations. The Lauttasaari metro station is served by two entrances: one in the Lauttis shopping centre, and one on Gyldenintie. Bus All the internal bus routes — 20, 21, and 21B — connect with at least one of the metro stations, and the routes 20 and 21 continue to the city centre. The bus routes 115A and 555 start at the centre of the island. Route 115A runs via Tapiola to Mankkaa in Espoo, and route 555 runs via Espoo to Martinlaakso in the city of Vantaa. Lauttasaari is also served by night bus routes 20N and 112N from the city centre. Car The Länsiväylä (also the National road 51) motorway that links central Helsinki with Espoo passes through Lauttasaari, and has two interchanges