Hi there,
Records of land prices may be available at the land registry of the municipality in which the property is located. These can help provide an overview of developments in the property's value.
It is worth noting that properties located near to high-voltage power lines may be difficult to resell or rent out due to concerns over the possible health effects of high-voltage power lines.
A key factor is whether exposure to the emissions and magnetic field of the power lines fall within the limitations set out by the Swiss federal government.
These can be found here (in German and French):
https://www.bafu.admin.ch/bafu/de/home/themen/elektrosmog/fachinformationen/massnahmen-elektrosmog/elektrosmog--die-grenzwerte-im-ueberblick.html#-2030544215
Prospective home buyers or renters who are interested in whether or not a property is located near a high voltage power line can find a detailed map of the Swiss power grid here:
https://map.geo.admin.ch/?topic=sachplan〈=de&X=271241.50&Y=659325.70&zoom=1&bgLayer=ch.swisstopo.pixelkarte-grau&layers=ch.bfe.sachplan-uebertragungsleitungen_kraft&catalogNodes=419,420,421,426,427,430,1245,1654,424
Best regards from Moneyguru
More on this topic:
Swiss mortgage comparison