Croatian term (edited): (nekretnina) slobodna od osoba i stvari.

kupcu predati posjed predmeta kupoprodaje, slobodan od osoba i stvari.

will give to the buyer vacant possession of the property (being the object of this contract)

Vacant possession and legal impediments
This guide was last updated in August 2011.
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The obligation to provide vacant possession is the legal commitment to ensure that, when a contract for sale is completed or a lease is terminated, property is fit for occupation both physically and legally.
Vacant possession is an essential element of any land transaction where the right to occupy property is being granted to a third party. It is particularly relevant to land sales; the grant, termination or transfer of a lease and, in some cases, to licenses to occupy. Vacant possession will normally appear as a specific term in a land agreement, but it may also be implied by law.
The most common impediment to vacant possession is when the previous occupier has left certain items on the property. For more information, please see our separate OUT-LAW Guide to Tenant's goods left at premises. In some cases, the previous occupier may remain in the property once the lease has terminated or sale contract completed, either because they have a contractual or statutory right to do so or because they may be trespassing. A third and more unusual obstacle to vacant possession concerns legal impediments, which are often overlooked.

[http://www.out-law.com/topics/property/property-litigation/v...]


Obviously, the next big impediment, or rather the first big impediment, is when they are still people on the property (tenants, ex-tenants still occupying the property, squatters etc) - the property can't be"vacant" if some people are still there.

http://en.wikipedia.org/wiki/Vacant_possession