Property Web Services

Additional attributes are required for federal properties, including Agency ID and Federal Real Property ID. What are these IDs, and how can I obtain them?
How can I create a space revision history for my property, building, or property use using web services? The API only allows one value for gross floor area.
When I try to add a property with the “post property” service, I receive an error stating that I did not provide values for the 'grossFloorArea' and 'primaryFunction'. The property schema does not appear to require these values. Are these values required?
When I try to associate an additional meter to a property use using a POST, the meters that I have associated previously seem to disappear. What's going on?
Is there a list of all Portfolio Manager data validations not represented in the XML schemas?
What does the "occupancyPercentage" field in the property.xsd represent? How do I calculate occupancy percentage?
What is the "constructionStatus" field in the property.xsd for?