Koivusaari
[2]: 10 Mainly consisting of reclaimed land, the island is fairly low, and its highest points only rise about seven metres above sea level.
There is a small natural outcrop and meadow beach on the southern tip of the island with a diverse selection of coastal flora.
[3]: 17 The flora in the southern tip includes grassleaf orache, Atriplex longipes, tall fescue, bearded couch, sand ryegrass, sea milkwort, silverweed, Silene vulgaris, bird's-foot trefoil, purple moor-grass, Odontites litoralis as well as lesser and greater centaury.
[3]: 11 Until the widening of Länsiväylä in the 1960s, the southern part of Koivusaari was owned by the plumbing company Radiator, which had a workshop and a storeroom on the island.
The city of Helsinki filled the island area with clay sludge and with reclaimed land made from the remains of buildings destroyed in the war.
[3]: 11 In 2003, the island hosted the boating companies Selboat Oy and Flipper Market, the maritime branch of the exercise department of the city of Helsinki and the yacht clubs Nyländska Jaktklubben and Koivusaaren Pursiseura.
The area was planned to be constructed with reclaimed land as tightly as the nearby district of Ruoholahti, which would have brought new apartment buildings and terraced houses[8] for about four to six thousand people.
Through various building projects, Helsinki had acquired large amounts of loose soil, which could be put into use as reclaimed land.
Sale of coastal lots in the area was thought to bring income to the city, which could be used to cover the cost of constructing the Länsimetro line.
Construction plans took a step backward in autumn 2000 and early 2001, as they failed to receive enough political support from the Helsinki city council.
[10] The issue was postponed to the functional zoning discussions in spring 2001, and a new investigation was made for the construction of the area, which would preserve the protected coastal meadow in the southern part of the island.
[15] The planning took a step ahead in autumn 2006 when the city of Espoo made a decision about constructing the Länsimetro line.
[17] An international idea contest about the planning of the area was held in 2009,[18] which resulted in the city receiving 101 different proposals about construction on the island.
[22] Another new functional zoning proposal for the area was completed in March 2014, including contracting the concrete cover on the Länsiväylä highway, making the tunnel into a lighter wide bridge because of security considerations.
[25] In March 2014 the city of Helsinki bought the Nokia executive villa in the north of the island for 2.75 million euro.
[28] The plan only went to force in March 2017 when the Supreme Administrative Court of Finland rejected a complaint made against it.
