Does anyone know how to read this diagram I pulled from the assessor site?

[Dan G.]

An appraiser I spoke to this morning showed me some benefits from making an account with the county Assessor site, and there is tons of useful information I can use but am having trouble understanding these diagrams. I understand the numbers circled represent sq footage but do not understand what any of the letters mean, or even the 1sFr or similar. Do they mean addition, garage, patio, porch, basement?

This is helpful to me,as I buy at sheriffs auction and rarely can go inside a property before I bid. This would help me determine how many bedrooms etc etc.

This is from Lake County, Indianas' Assesor site. Thanks in advance