That is a job for Shaping.
1. Depivot the data like this:

2. Compute Effective Rent = @Value@. Be sure to set a Filter on Concept Name =Effective Rent

3. Compute Vacancy = @Value@. Be sure to set a Filter on Concept Name = Vacancy

4. Finally, Group By Property Class Name, Geography Name, and QuarterYear (will be called "Columns" at this point)