The price per m² of residential land varies from one commune to another. For historical transaction prices, you can refer to the land registry office that publishes this information.
To give you an idea, the prices per m² of land in Switzerland vary greatly. In 2020, they start from CHF 200 and go up to CHF 2,500 in the largest cities.
In Zurich, for example, the average price per square metre is CHF 2,400.
In Geneva, the price of land per square metre is CHF 1,700, but here again, it can vary from district to district.
In Champel (Geneva) the average land price per m² is CHF 1'000 and in the Val d'Arve-Bout du Monde neighbourhood the average price per m² is CHF 1'500.