Manhattan’s office market is showing renewed strength, with major tenants driving a surge in activity. Deloitte, Guggenheim Partners and Salesforce led the way in the third quarter, pushing total leasing volume to 9.4 million square feet, 27 percent above the five-year average, according to Colliers. Year-to-date activity has already exceeded 30 million square feet, the strongest since 2002, and could surpass 40 million by year-end.

Deloitte’s 807,000-square-foot lease at 70 Hudson Yards was the largest of the quarter, followed by major renewals from Guggenheim and Salesforce. Availability has dropped to its lowest point ...