The vacancy rate in the O'Hare submarket outside of Chicago has declined significantly since 2011, dropping from 26.9% to a low of 16.4% currently. The availability of large blocks of office space (50,000 square feet or more) has also declined sharply over the last eight months, with only eight blocks totaling 775,802 square feet available now compared to 11 blocks and 1,017,321 square feet available last June. As the market tightens further, rents are expected to rise for tenants and landlords may begin planning new developments in the submarket.