Houston's office sublease market saw a small decrease in sublease space in Q2 2018, though additional sublease listings have slowed the downward trend. Most sublease spaces currently available have 1-3 years left on their leases, though some large blocks have 5+ years remaining. The sublease vacancy rate was 2.5% in Q2 2018 and the total available sublease rate was 4.3%. Sublease leasing activity and net absorption both decreased in Q2 2018 compared to previous periods. The CBD and West Houston submarkets have the most concentrated sublease availability.