Net absorption is the net change in occupied space in a market over a set period, usually a quarter or a year. It equals space that tenants moved into minus space they vacated, adjusted for inventory changes. Positive net absorption signals expanding demand. Negative net absorption signals contraction.
How Is Net Absorption Calculated?
Net absorption is calculated by subtracting the square footage tenants vacated from the square footage they newly occupied over the period. The direct formula is Net Absorption = Occupied Space at End of Period - Occupied Space at Start of Period. An inventory-aware version adds space delivered and subtracts space removed, isolating true demand from supply swings.
Per Wall Street Prep, the fuller expression is Net Absorption = (Vacant space at start + New space delivered) minus (Space removed + Vacant space at end). Both forms produce the same demand signal. Analysts prefer the occupancy-change form for its simplicity and the inventory-aware form when demolitions or conversions distort the picture, as they did across the 2025 US office market.
Input | Definition |
Occupied space (start) | Total leased and occupied square footage at the period open |
Occupied space (end) | Total leased and occupied square footage at the period close |
New space delivered | Square footage added to inventory during the period |
Space removed | Square footage lost to demolition or conversion during the period |
Net absorption | The net change in occupied space, positive or negative |
Net absorption is reported at the submarket, market, and national level by data providers including CBRE, JLL, and Cushman & Wakefield. It is a flow measure over time, not a stock, which distinguishes it from vacancy rate, a point-in-time snapshot.
Why Net Absorption Matters
Net absorption matters because it is the cleanest read on whether a market is gaining or losing tenants, which drives rent direction and pricing power. Sustained positive absorption tightens vacancy and supports rent growth. Sustained negative absorption loosens the market and pressures rents lower, weakening the income assumptions behind any acquisition.
The operator-side use is directional, not decorative. Per CBRE, US office net absorption totaled 6.9 million square feet in Q1 2026, the eighth consecutive quarter of positive demand, coinciding with average asking rent rising 2.2% year over year to $37.21 per square foot. Absorption trends lead rent trends, so an underwriter watches the absorption curve to sanity-check whether a pro forma rent bump is supported by demand or invented.
Example
A submarket opens the quarter with 10,000,000 square feet of occupied office space. During the quarter, tenants take 250,000 square feet in a newly delivered tower and expansions, while other tenants give back 170,000 square feet. Occupied space closes at 10,080,000 square feet. Net absorption for the quarter is 80,000 square feet.
Component | Square Feet |
Occupied space at start | 10,000,000 |
Space newly occupied | 250,000 |
Space vacated | 170,000 |
Occupied space at end | 10,080,000 |
Net absorption | 80,000 |
The 80,000 square feet is positive, so demand outpaced move-outs. If the same 250,000 square feet had been taken while 300,000 square feet was vacated, net absorption would be negative 50,000 square feet, a contracting market even though leasing activity looked busy. Gross leasing volume alone hides that signal, which is why the net figure carries the meaning.
Variations and Edge Cases
Net absorption behaves differently depending on how inventory and sublease space are handled, so the same headline number can read as strength or noise. The table below covers the variants an analyst should confirm before trusting a market read.
Variant | Treatment |
Gross absorption | Total space leased in the period, ignoring move-outs; overstates demand |
Negative net absorption | Vacated space exceeds occupied space; a contracting market |
Sublease space | Space put back on the market by tenants can mask true occupancy loss |
New deliveries | A large delivery leased on day one inflates absorption without demand growth if not inventory-adjusted |
Inventory removal | Conversions and demolitions shrink supply and can flatter the vacancy rate independent of absorption |
The most common mistake is confusing gross absorption with net absorption. A market can post heavy gross leasing and still lose ground if move-outs exceed new occupancy. Per CBRE, 2025 was the first year since tracking began in 1988 that US office inventory removals outpaced new completions, a supply-side shift that changes how absorption should be read.
Net Absorption vs Vacancy Rate
Net absorption is often confused with vacancy rate, and they measure different things. Net absorption is a flow, the change in occupied space over a period. Vacancy rate is a stock, the share of total inventory sitting empty at a single point in time. One tells you the direction of demand; the other tells you the current level of emptiness.
The two move together but not mechanically. Positive net absorption usually pulls the vacancy rate down, but a wave of new deliveries can push vacancy up in the same quarter that absorption is strongly positive, because supply grew faster than demand. Analysts read them as a pair: absorption for momentum, vacancy for the current supply-demand balance.
Frequently Asked Questions
How do you calculate net absorption?Net absorption is occupied space at the end of the period minus occupied space at the start. Equivalently, it is the square footage tenants newly occupied minus the square footage they vacated. To isolate true demand, add space delivered and subtract space removed from inventory during the period.
What is the difference between gross and net absorption?Gross absorption is the total square footage leased during a period, counting only move-ins. Net absorption subtracts move-outs, so it measures the actual change in occupied space. A market can show high gross absorption and negative net absorption at the same time if vacated space exceeds new leasing.
Is positive net absorption good?Positive net absorption generally signals expanding demand, tightening vacancy, and support for rent growth. It is a favorable sign for landlords and a caution for tenants. Negative net absorption signals the opposite: contracting demand, rising vacancy, and downward pressure on rents.
Related Terms
Market Rent
Asking Rent
Loss to Lease
Rent Roll
Pro Forma