Glossary

Second-Generation Space

Also known as: second-gen space

Office space that has been previously built out and occupied by at least one prior tenant, as distinguished from first-generation space, which has never been improved beyond base building shell condition.

Second-generation space is the workhorse of most office leasing activity and carries distinct economics from first-generation space: landlords typically offer a lower tenant improvement allowance because existing improvements (ceiling grid, HVAC distribution, some partitions, and finishes) may be reusable, which can shorten construction timelines materially if the incoming tenant's layout is compatible with the existing plan, but can also impose costly demolition and remediation expense if it is not. A key underwriting nuance is that "second-generation" says nothing about the quality or age of those existing improvements — space vacated after a short-term tenant's five-year lease looks very different from space vacated after a twenty-year occupant's departure — so landlords and tenants alike inspect the specific condition of existing improvements rather than relying on the second-generation label alone to estimate build-out cost.