Office space, shops and industrial space are rented on average for 5 years in Bulgaria. In case of contracts with longer term, the rent is lower than the average and the tenants secure the use of the office for a long time. On the part of the owner long term rental contracts secure a guaranteed income from their property for a long time.  Rents in Bulgaria are updated by using a standard method of measuring of the inflation on the basis of the prices of goods, used within the EU. As in most countries the rent in Bulgaria is calculated on a monthly or on an annual basis. The terms for the extension of the contract are usually set in the contract but when the term of the contract expires and the tenant continues to use the space, it is considered that the contract has been extended indefinitely. In such case the contract is terminated by a notification given by any of the parties one month in advance.