BOMA Standards

BOMA Measurement Standards

boma-standardsFor almost 100 years, BOMA International has set the standard for measuring buildings. In 1915, BOMA first published the Standard Method of Floor Measurement for Office Buildings, an accepted and approved methodology by the American National Standards Institute. Throughout the years, the standard has been revised to reflect the changing needs of the real estate market and the evolution of office building design. Today, BOMA International is the secretariat of a suite of measurement standards:


  • Office Buildings: Standard Methods of Measurement (ANSI/BOMA Z65.1 – 2010)
  • Industrial Buildings: Standard Methods of Measurement (ANSI/BOMA Z65.2 – 2012)
  • Gross Areas of a Building: Standard Methods of Measurement (ANSI/BOMA Z65.3 – 2009)
  • Multi-Unit Residential Buildings: Standard Methods of Measurement (ANSI/BOMA Z65.4 – 2010)
  • Retail Buildings: Standard Methods of Measurement (ANSI/BOMA Z65.5 – 2010)
  • Mixed-Use Properties: Standard Methods of Measurement (ANSI/BOMA Z65.6 – 2012)

For more information or to purchase these standards, visit BOMA International’s online bookstore at


BOMA Building Classification Guide

building-classification-guideWhat does a Class A Building mean? What are the differences between Class A, B and C buildings? When looking for new office space, a tenant will quickly realize most buildings are classified in one of those three categories. The factors that determine a building’s class vary in each market, so a Class A office building in a major urban city will be much different than a Class A office building in a small rural town of 30,000 people. There are no definitive formulas used to classify a building, but a general definition for each class is provided in the guide.



BOMA Building Classification Guide