Absorption, Vacancy and Availability: Reading Market Fundamentals
Four statistics decide whether a market has pricing power. Three of them are routinely confused with each other.
Investing · 566 words · updated 2026-08-26
Market reports lead with vacancy because it is a single number. It is also the slowest and least forward-looking of the fundamentals. Understanding the difference between the measures is what turns a market report into a decision.
The definitions
- Vacancy rate — space that is physically unoccupied, divided by inventory. It says nothing about whether occupied space is being marketed.
- Availability rate — space being marketed for lease, whether or not it is currently occupied. Includes sublease space and space with a known future expiry. It leads vacancy, typically by two to four quarters.
- Net absorption — the change in occupied space over a period. Positive means tenants took more space than they gave back. It is a flow; vacancy is a stock.
- Deliveries and pipeline — space completed in the period and space under construction. New supply lands in inventory whether or not it is leased.
Why availability leads
A tenant that decides in March to leave in December puts the space on the market in April. Availability rises immediately; vacancy does not move until December. In a downturn, the gap between availability and vacancy widens — that gap is one of the earlier signals a market is turning. In a recovery it narrows as marketed space gets absorbed before it ever goes dark.
Sublease availability is the sharpest version of this signal. Sublease space is priced by tenants who want out, not by landlords protecting face rent, so it usually undercuts direct space and drags effective rents down well before direct asking rates move.
Reconciling the numbers
The identity that ties them together:
Δ Vacant SF = Deliveries − Net absorption + Demolitions/conversions (as a reduction of inventory)
If vacancy rose while absorption was positive, supply outran demand — that is a supply story, not a demand story, and it resolves when the pipeline empties. If vacancy rose while absorption was negative, demand contracted, which is a longer problem. A market report that reports vacancy without absorption cannot tell you which one you are looking at.
Months of supply and the rent inflection
Divide available space by the trailing twelve-month absorption rate to get months of supply. Combined with the construction pipeline as a percentage of inventory, it is the most practical read on pricing power:
- Low availability, positive absorption, thin pipeline → landlord market, concessions compress first, then face rents rise.
- Low availability, positive absorption, heavy pipeline → rents rise now, then flatten on delivery. Time the lease term against the delivery schedule.
- High availability, negative absorption → concessions widen well ahead of face rent falling. Ask for the concession data, not the asking rate.
Common measurement traps
- Inventory changes. If a data provider adds buildings to its tracked set, vacancy and absorption both move for reasons that have nothing to do with the market. Check whether a series is same-store.
- Owner-occupied space. Including or excluding it changes both inventory and vacancy materially in industrial markets.
- Class definitions. "Class A" is a judgement, not a standard, and it drifts as new supply resets the top of the market. Class A vacancy series are the least comparable across providers.
- Submarket boundaries. Different providers draw them differently. Comparing a submarket series across sources is usually comparing two different geographies.
Whichever provider you use, hold the definitions constant and read the trend rather than the level. The level is a definition; the trend is the market.