Pick the right measurement standard to measure your building’s RSF

BOMA Building Measurement Standards Guide

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When you measure a building, accuracy matters. BOMA’s ANSI-certified standards are the most widely recognized way to calculate building area for leasing, valuation, benchmarking, and compliance. Each standard is written specifically to meet a leasing need in the marketplace. Choosing the correct one avoids disputes, keeps your data defensible, and builds trust between owners, managers, and tenants.

Below is a clear guide to the current BOMA International’s Building Measurement standards and how to choose the right one.

There are 6 currently maintained standards maintained by BOMA International.

Four are use specific:

  • Office Buildings

  • Industrial Buildings

  • Retail Buildings

  • Multi-Family & Hospitality Buildings

And two generic use standards:

  • Mixed-Use Buildings

  • Gross Building Areas

You will notice that each BOMA standard has multiple published versions. These standards are certified by the American National Standards Institute (ANSI), which means they must be written and updated by a committee of industry professionals who reach consensus on every change. ANSI also requires that each standard be reviewed and either reaffirmed or updated every five years.

Because of that process, BOMA updates follow a roughly five year cycle, and older versions remain available. There is no regulation that forces owners to use BOMA or to use the latest edition, which is why you may see several versions in use at the same time. Solid Tech can help you decide which version best supports your objectives.

Due to these many standards, it is highly recommended that all users site the standard used clearly in any documentation sighting a measurement, including the ANSI/BOMA number and date for clarity.

Please note that the guidance here comes from that written in the standards themselves by BOMA. The BOMA standards also state that “governing documents” may dictate a standard to be used. In this way, users may choose any standard they think best fits their subject property simply by sighting it in documents such as lease agreements or letters of intent.

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BOMA International Office Building Standard

Method of Measurement ANSI/BOMA Z65.1
Versions: 1996, 2010, 2017, 2024

Methods: A & B - load factor calculations

For use in buildings who’s dominant use is office tenants. But if there is significant mixed use, or any residential or hotel use, a mixed use approach is recommended.

Highlights:

  • Defines a loaded Rentable Area (RSF) and Load Factor

  • Provisions for Life Science MOBs

  • Full building measurement required

  • 2017 and 2024 versions allow flexible methods for allocating shared common space

  • 2024 adds improvements for amenity spaces and transparency

Best fit when:
You want defensible rentable square footage that aligns with industry expectations and leasing practice.

BOMA 2024 for Office Buildings - Standard Methods of Measurement (ANSI/BOMA Z65.1-2024) The primary purpose of this standard is to calculate Rentable Area, a crucial metric in office leasing, space utilization analysis, valuation, and benchmarking
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BOMA Industrial Building Standard

BOMA 2025 for Industrial Buildings - Standard Method of Measurement (ANSI/BOMA Z65.2-2025) which allocates shared space among occupants and calculates rentable area in Industrial and Flex Buildings, this standard goes to great detail to cover

Method of Measurement ANSI/BOMA Z65.2
Versions: 2009, 2012, 2019, 2025

Methods: A & B - Unified in 2019 and 2025

For use in buildings who’s dominant use is Industrial including warehouse and distribution centers as well as flex space that may sometimes include office area. But if there is significant mixed use, or any residential or hotel use, a mixed use approach is recommended.

Highlights:

  • Defines methods for determining Rentable Area (RSF) in industrial buildings.

  • Provisions for Life Science Manufacturing

  • Full building measurement required

  • Clarifies how to handle mezzanines, loading docks, and other industrial use dedicated space.

Best fit when:
You need accurate Rentable Area for an industrial leasing or valuation.

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BOMA Retail Standard

Method of Measurement ANSI/BOMA Z65.5
Versions: 1996, 2010, 2020, 2025

For use in buildings who’s dominant use is Retail such as shopping centers, street level retail, or retail suites.

Highlights:

  • Focuses on Gross Leasable Area (GLA)

  • Does NOT require a full building measurement

  • Updated to reflect the shift in modern retail layouts

Best fit when:
You are leasing retail suites or determining GLA.

BOMA 2025 for Retail Properties Standard Method of Measurement (ANSI/BOMA Z65.5-2025) - BOMA 2025 for Retail Properties: Standard Method of Measurement (ANSI/BOMA Z65.5-2025) is the update to the 2020 Retail Standard
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BOMA Multi-Unit Residential & Hospitality Standard

ANSI/BOMA Z65.4
Versions: 2010, 2023, 2026 (in development)

For use in Apartments, Condominiums, Senior Living, Hotels, and Hospitality Buildings. Many local jurisdictions have laws regarding measuring condominiums, so care is necessary when navigating those. If there is any Office or Flex / Industrial, a mixed use analysis is recommended to allocate mixed use common areas.

Highlights:

  • Finds Living and Non-living Area

  • Can be applied to an individual living unit

  • Can find proportionate shares of non-living area

Best fit when:
You need a standard that reflects living units, common areas, services, amenities, and building efficiency.

BOMA 2023 for Multi-Family and Hospitality Properties - Standard Methods of Measurement (ANSI/BOMA Z65.4-2023) features a Gross Area Method of measurement and a Net Area Method of measurement, with the Net Area Method
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BOMA Mixed-Use Standard

BOMA 2021 for Mixed-Use Properties - Standard Method of Measurement (ANSI/BOMA Z65.6-2021) is the update to the 2012 Mixed-Use Standard and is intended exclusively for Mixed-Use Properties and their associated structures.

ANSI/BOMA Z65.6
Versions: 2012, 2021, 2026 (in development)

Use this when measuring buildings with multiple asset types in one footprint.
Office + Retail
Multifamily + Retail
Hotel + Office

Highlights:

  • Provides rules for allocating shared space across different occupancies

  • Results are paired with other standards to provide Office, Hotel, Retail, and Multi-Family measurement results as desired.

Best fit when:
Your building has more than one asset class and you need a unified method to allocate common spaces. This standard sets a framework to measure all the common area shared among mixed use types and distributes them before then taking each use group and applying a use appropriate measurement for that share of the mixed use building. (confusing, I know. Just call us)

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BOMA Gross Areas Standard

BOMA 2024 Gross Areas - Standard Methods of Measurement (ANSI/BOMA Z65.3-2024) is to provide a comprehensive and consistent methodology for measuring all building types while presenting the data in various ways that are useful to the stakeholders

Standard Method of Measurement ANSI/BOMA Z65.3
Versions: 2009, 2018, 2024

This measurement standard can be used for leasing when a single tenant is occupying an entire building. It is also useful for planning, construction, and permitting. Of particular use is in energy benchmarking with the new 2024 standard including Energy Star compliant measurements.

Highlights:

  • Measures gross building area

  • Allocating campus common area

Best fit when:
You need a universal, whole-building square footage before tenant space allocation.

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