There are three terms on the County's Property Assessment Site I'm not sure what they mean.  Can anyone help?

The terms in the Residential Building Information section are:

Grade (It has a letter grade), What is it grading and what do the letter grades mean?

Condition (it has terms like fair, average, etc)  I assume that the terms refer to the shape of the building.

Garage ( I  see mostly "0" listed where there are garages on the property) Does this only refer to integral garages?

Thanks,

Ed Sullivan