At the current time, 254,600 sq m of new or fully-renovated office space is under construction. 174,600 sq m is planned for completion this year, but half of this amount is already occupied. Thus only around 85,000 sq m of free offices and premises releasing tenants for relocation will be entering the market. Class A buildings comprise the majority of modern office supply (73 %), while the proportion of the highest quality premises, assigned the AAA category has reached just under 22 % of total office space volume. The proportion of vacant office space to total supply came to 5.1 % in the fourth quarter of 2019, which represents a growth of 0.5 percentage points compared to the third quarter of 2019 results. The total volume of free office space came to 182,700 sq m. The highest volume of available office space was in Prague 4, at 52,100 sq m, with a vacancy rate of 7.2 %. The fewest free offices were in Prague 10 with 1,600 sq m (vacancy rate 1.1 %) and Prague 3 with 3,100 sq m (2.4 %).