It means you mistyped the word :P I believe you are talking about "devren". And what you guessed is true. The owner is selling the apartment or the store, with everything inside of it. If it is an apartment, all the furnitures, appliances etc will be sold too. If it is a shoe store, then the owner is selling the shoes too.

You mistyped the word. Not devern, but 'devren'. It means the owner is selling or renting out the flat with furnitures/the store with all the goods, the bussines with its effects etc. So you usualy see two expression with it in an estate site: Devren kiralık: for rent (with all contents) Devren satılık: for sale (with all contents) Btw. This word is used more for stores/shops/bussiness than for flats/houses. (Esp. in general Turkish)