Lab Demand Is Up 44% and Landlords Are Losing Anyway

The Signal:

• Demand recovery and landlord recovery are not the same event.
• Vacancy this deep converts rising demand into shorter, cheaper leases.
• Duration, not occupancy, is where lab value is being destroyed.

Lab leasing demand across Boston, the Bay Area, San Diego, and Raleigh-Durham surged 44% year over year to nearly 8 million square feet in Q1. On most tapes that is a recovery headline. Here it is not, because vacancy across Boston, San Diego, and the Bay Area sits near 32% — Boston alone around 33%.

When one in three feet is empty, incremental demand does not set price. It sets terms. Average lease terms for direct relocations have compressed to 62 months, roughly 30% shorter than at the market peak, alongside record free rent and pre-built space.

That is the number that matters for value. A 62-month weighted average lease term is a fundamentally different asset than the ten-year credit lease lab was underwritten as. Shorter duration means more frequent rollover, more recurring TI and leasing costs, and a higher cap rate on identical NOI.

San Diego shows where this lands: a sub-10% core against a sharply weaker outer ring. The recovery is real and it is narrow.

Implications: Owners should underwrite lab as a shorter-duration, higher-capex asset class and stop modeling peak-vintage lease terms. Tenants hold genuine leverage and should be trading term for concessions now. For lenders, the risk has moved from lease-up to re-lease frequency — the diligence question is what the rollover schedule and TI reserve look like in year five, not whether the building fills.