The lease agreements contain an inflation clause so that rents are increased annually in line with inflation. In practice, this means that, all else being equal, the price of the property will increase by the rate of inflation year on year, too.
Inflation
Inflation is the general rise in the price level in an economy. Inflation is most often measured by the consumer price index, which compares the prices of selected goods and services weighted according to their importance in total household consumption. The inflation rate is obtained by comparing the value of this index at different times. Inflation results in a decline in the purchasing power of money because the same amount of money can buy fewer goods and services.
Source: penize.cz