Add PercentLeasedByOwner to Building.md

Building - Add PercentLeasedByOwner

Overview

Standard 211 requests collection of the percent of building leased.

Justification

Standard 211 needs a place for PercentLeasedByOwner

Implementation

Add //element(*,auc:SiteType)/auc:Buildings/auc:Building/auc:PercentLeasedByOwner

References

N/A