BOMA 2024 and NOI: Quantifying the Financial Impact of Remeasurement

The BOMA 2024 Office Standard — formally titled "Office Buildings: Standard Methods of Measurement" — represents the first major revision to how office space is measured in over a decade. For property controllers and asset managers, the question is not whether the standard is better (it is). The question is whether remeasuring your building improves your financial position or creates new problems.

This article walks through the measurement changes, quantifies the financial impact on a real building scenario, and identifies the decision points that determine whether remeasurement is worth the investment.

What Changed in BOMA 2024

BOMA 2024 expanded the definition of rentable area to capture spaces that generate value for tenants but were excluded from older measurement standards. The major additions fall into four categories.

Outdoor Amenity Spaces

Prior standards measured only enclosed areas. BOMA 2024 allows outdoor amenity spaces — rooftop terraces, courtyards, landscaped tenant patios — to be included in rentable area calculations. These spaces must be intentionally designed for tenant use (not just leftover roof area) and must have defined access points and boundaries.

For buildings that invested in outdoor amenity buildouts during 2020--2023, this is the most significant change. A 3,500 SF rooftop terrace that was previously unmeasured now contributes to the building's total RSF.

Single-Tenant Mechanical and Equipment Spaces

Under BOMA 1996 and 2010, vertical penetrations and mechanical shafts were either excluded or handled inconsistently. BOMA 2024 clarifies that mechanical spaces serving a single tenant — dedicated HVAC units, private server closets, supplemental cooling equipment — can be allocated to that tenant's rentable area.

Amenity and Service Areas

Fitness centers, conference centers, mother's rooms, and other shared amenity spaces are now explicitly addressed with a standardized allocation methodology. Under older standards, the treatment of these spaces varied by measurement firm, creating inconsistencies between buildings and even between floors of the same building.

Load Factor Methodology

The load factor calculation under BOMA 2024 uses a simplified allocation model that distributes common areas more consistently. The old system had multiple allocation tiers (floor common areas, building common areas, major vertical penetrations) that frequently created disagreements between landlords and tenants during audits. The 2024 model reduces allocation layers, which changes the load factor for most tenants — sometimes up, sometimes down.

The 100,000 SF Building Scenario

Consider a Class A suburban office building with the following profile:

Building characteristics:

• Original measurement (BOMA 1996): 100,000 RSF
• Floors: 5 (20,000 RSF per floor)
• Year built: 2005
• Renovations: Rooftop terrace added 2022, fitness center added 2021
• Current occupancy: 82% (82,000 SF leased)

Existing financial profile (pre-remeasurement):

Remeasurement Results

A certified BOMA measurement professional remeasures the building under BOMA 2024. The results:

The building grew by 4,800 RSF without a single square foot of construction. That 4.8% increase drives every financial metric that follows.

Impact on Existing Tenant Pro-Rata Shares

Every existing tenant's pro-rata share changes because the denominator changed. Take Tenant A, who leases 15,000 SF on the third floor:

Tenant A's CAM charge drops by $8,625 annually — not because expenses decreased, but because the denominator grew. Multiply this across all tenants and the total recovery shortfall becomes significant.

Recovery Dilution: The Short-Term Problem

With 82,000 SF of existing leases referencing the old 100,000 SF denominator, here is what happens to total recovery:

Scenario 1: Use old denominator for existing leases (contractual obligation)

• Existing tenant recovery: 82% of $1,250,000 = $1,025,000
• No change from pre-remeasurement — existing leases still reference 100,000 SF

Scenario 2: Update all tenants to new denominator (requires lease amendments)

• Total tenant share at new denominator: 82,000 / 104,800 = 78.24%
• Recovery: 78.24% of $1,250,000 = $978,000
• Annual recovery loss: $47,000

This is the core tension. If you update the denominator without adjusting anything else, you lose $47,000 in annual recovery. That flows directly to the bottom line. At a 6.5% cap rate, $47,000 in lost recovery translates to $723,000 in lost property value.

Rate Normalization: The Long-Term Opportunity

The financial benefit of remeasurement appears on the leasing side. When new leases are signed against the larger RSF, the per-SF rental rate adjusts downward, but the total rent can remain the same or increase.

New lease scenario — Suite 410 (currently vacant):

The tenant sees a lower rate per SF, which helps leasing velocity. The landlord collects essentially the same (or slightly more) total rent. This works because the additional RSF is not phantom — the tenant genuinely gets access to the terrace. The space is real, even if it was previously unmeasured.

Modeling the Break-Even Timeline

How long until remeasurement pays for itself? That depends on lease rollover.

Assumptions:

• Remeasurement cost: $12,000 (one-time)
• Annual recovery dilution on existing leases: $47,000
• Lease rollover rate: 20% of SF per year (average 5-year terms)
• New leases signed at BOMA 2024 measurement with proportionally higher base rent

The break-even point falls near the end of Year 3. By Year 5, the remeasurement produces a net benefit of approximately $45,800 annually. The cumulative break-even (recovering the initial losses) happens mid-Year 4.

This math shifts dramatically based on rollover timing. A building with 60% of leases expiring in the next 18 months reaches break-even much faster. A building with 80% of SF locked in 10-year leases may not break even for seven years.

Load Factor Changes

The load factor is the ratio between usable and rentable square footage. It determines how common areas are allocated to individual tenants. BOMA 2024 changes this calculation in ways that matter for reconciliation.

Under BOMA 1996, load factors for Class A office buildings typically ranged from 1.12 to 1.18. Under BOMA 2024, the same buildings tend to show load factors of 1.15 to 1.22, reflecting the inclusion of amenity spaces in the allocation.

A higher load factor means each tenant's rentable SF includes a larger share of common areas. For a 10,000 usable SF suite:

The tenant's rentable SF increases by 400 SF, but their pro-rata share actually decreases because the building denominator grew faster than the tenant's allocation. This is counterintuitive and is the single most common source of confusion in BOMA 2024 discussions.

Dual-Standard Transition Period

Most buildings will operate in a dual-standard environment for years after remeasurement. Some tenants have leases that specify "BOMA 1996 standard" or "ANSI/BOMA Z65.1-1996" by name. Others reference "the building's total rentable area as measured from time to time." The lease language determines which denominator applies to each tenant.

For the property controller, this means maintaining two measurement records:

1. Legacy RSF — for tenants whose leases reference a specific BOMA standard or a fixed RSF figure
2. Current RSF — for new leases and tenants whose leases allow floating denominators

Running two denominators simultaneously is operationally painful. Every reconciliation must apply the correct denominator per tenant. The gross-up calculation must use the correct total. Cap calculations must reference the correct per-SF figures. One wrong denominator choice cascades into every downstream number.

Decision Framework: When to Remeasure

Remeasurement makes financial sense when three or more of the following are true:

• More than 30% of leased SF expires within 24 months — enough rollover to realize the rate normalization benefit quickly
• The building has amenity spaces added after the last measurement — terraces, fitness centers, conference centers that BOMA 2024 can capture
• Comparable properties in the market have adopted BOMA 2024 — leasing brokers will show tenants buildings measured under the same standard
• Current occupancy is above 85% — recovery dilution is a smaller concern when most tenants are already paying
• The asset is being marketed for sale within 3 years — a higher RSF improves the property's competitive positioning

Remeasurement is premature when most leases are long-term (7+ year remaining terms), the building lacks amenity spaces that BOMA 2024 captures, or the market has not yet adopted the new standard.

Protecting NOI During Transition

If you proceed with remeasurement, protect your recovery position:

1. Do not update existing lease denominators without tenant agreement. If the lease says 100,000 RSF, you bill against 100,000 RSF until that lease expires or is amended.
2. Sign new leases at BOMA 2024 measurement. New tenants get their suite measured under the current standard. Their denominator is 104,800.
3. Track the weighted-average denominator. For financial reporting, calculate the blended recovery rate across both denominators to understand your true recovery position.
4. Adjust gross-up calculations per denominator group. The gross-up occupancy calculation should use the denominator that matches the tenant's lease. Mixing denominators in the gross-up formula is a common billing error and a guaranteed audit finding.
5. Document everything. When the next tenant audit arrives, the auditor will ask why two tenants on the same floor have different pro-rata shares. The answer needs to be documented before the question is asked.

Related Resources

• Denominator Drift: The Silent Revenue Killer — How denominator changes accumulate over time
• Pro-Rata Share Calculation — The math behind tenant share allocation
• Gross-Up Calculation Guide — How gross-up interacts with measurement changes
• CAM Reconciliation Timeline Checklist — Full reconciliation workflow

Sources

1. BOMA International — BOMA 2024 Office Standard — BOMA
2. BOMA International — Transitioning to the New BOMA Standard — BOMA Guidance
3. Cushman & Wakefield — Load Factor and Measurement Trends (2025) — C&W Research