About 

EUI - Energy Use Intensity  = Total Building Energy Use per Year (measured in kBtu) / Total Gross Floor Area (measured in sqft)

Energy Star Score - A measure of the relative energy efficiency of a building, as compared to buildings of similar size, occupancy, and other parameters in the United States.  [cite the legislation creating and requiring]

Energy Grade - A letter score assigned to a building based on its energy star score. [cite the legislation creating and requiring]

Low-Income Housing QCT - A building classified as low-income housing via Qualified Census Tracts must have 50 percent of households with incomes below 60 percent of the Area Median Gross Income (AMGI) or have a poverty rate of 25 percent or more. 

Null - There is no information available from the data source.

Parent Property – The "parent" is the entire campus or complex. That is, the parent is the multi-building property for which you have also chosen to benchmark individual buildings separately. For example, a high school has 2 buildings: the main classroom building and a separate gymnasium. When you enter the high school you will designate it as a multi-building property with two buildings. If you choose to enter and track the classroom building and gymnasium individually, then your high school property is called the "parent property" while the classroom building and gymnasium are "children" properties.

Child Property – The "child" buildings are the individual buildings on a campus. In the example above, the two "child" buildings are the main school and the gymnasium. 

Note: A Child building can have 2 parents. But a building cannot be both a parent and a child (no nesting of campuses).

Standalone – Free-standing building