To complete a property sale, the purchase agreement must be officially notarised.
There are two different types of notary: state notaries, which now only exist in their traditional form in the cantons of Schaffhausen and Zurich, and independent notaries which can be found in all other cantons.
In cantons with state notaries, you must contact the relevant office (the district clerk, bankruptcy administrator or cantonal commercial registry).
In cantons where any notary may be chosen, the buyer usually chooses the notary.