That's easy. There is a such law for apartments in Netherlands. In NL you have to report apartment to the municipality if it's not occupied for a year and they

That's easy. There is a such law for apartments in Netherlands. In NL you have to report apartment to the municipality if it's not occupied for a year and they will arrange something for you. Sure it won't be very profitable or may be even bad for your property if they rent it out as a social apartment, but you had a full year to find a tenant. If you didn't report and they find out - you'll get a good fine. The reason for all this is that the apartment can be easily squatted. And municipalities are not welcoming squatting.