Rockwood Design, PC has been performing area verification for landlords, tenants and building owners for 10 years. We utilize a Disto laser measuring system which measures to 1/16" accuracy, then draw the plan in DataCAD V.X3 and calculate usable area. If the entire building is measured, we can also chart leaseable areas, assigning the common areas on a pro-rated basis to each tenant.
BOMA/ANSI standards are only standards and not law, written so tenants can compare apples to apples when comparing potential spaces. Landlords and Owners have the option to determine lease areas as they deem appropriate.