If you need an as-built for the purpose of BOMA useable/rentable sf calculations we recommend an As-Built survey. BOMA requirements depend on accuracy. Existing plans of your building may not be accurate. We don't recommend basing BOMA calculations on Field Verification of Existing plans.
Always check with your design professional before proceeding with any as-built decisons. If you have questions on this topic. Email: Info@ClearLogicGroup.com