By Sam Tenenbaum and David Kahn CoStar Analytics October 28, 2021 | 10:06 AM The average square foot per office lease has rebounded over the past few quarters, reversing a pandemic-era drop. While the average size of office leases across the country is still below the pre-pandemic average, the recent increase is an indicator that the office sector is starting to return to normal. In the years leading up to the COVID pandemic, office leasing activity was relatively consistent.