Boma Method: A method of measurement of lettable areas; now superceded by a product produced by the Property Council of Australia (http://www.propertyoz.com.au). There has been a reprint of the 1997 Method of Measurement, the 2008 version provides guidelines for measuring floor space in leased premises. The guidelines, covering office, industrial and retail premises, aim to provide consistency by documenting a defined approach to floor space measurement that is both practical and cost effective.

The extract adjoining is a section out of the 1997 BOMA manual showing the extent that one needs to go to to measure lettable areas under this method. The pink areas are considered 'lettable areas'.