No one can terminate your lease.
You can make whatever changes you like to your house or to your apartment (subject to the building regulations of the commune, canton or the condominium).
The savings you invest in a house or an apartment are no longer easily accessible.
If you are a homeowner in Switzerland, you have to pay income tax on the equivalent rental value of your property. On the other hand, mortgage interest rates are fully deductible and maintenance expenses are partially deductible.
Several cantons levy a tax on property (also known as land or real estate tax):
Property transfer tax is normally levied when you buy property
If you own an apartment, a house or land, you must declare it in your tax return, and you are liable to pay wealth tax on it
If you sell your house or apartment, you must pay property gains tax