So the official estimates of savings from both the centralized and decentralized plans are now up on the 2020 Vision Website. (Once again, I want to commend Dan Drake for his transparency throughout this process.) From one of the documents:
We estimate the centralized plan to save the DeKalb County School District approximately $150 million in operating costs over the next ten years; the decentralized option is estimated to realize gains of approximately $161 million over that same time period. Additionally, we can expect an extra $5 million in capital entitlement earnings over the ten year period from the centralized plan (and slightly less in the decentralized plan).
After studying the various documents and trying to understand how the savings are greater with the Decentralized Option, I have come to the following conclusion. Because the Centralized Plan utilizes Avondale Middle and Avondale High School, there is a loss of the 3 Million Dollars annually in savings from shuttering those schools. In addition, Nancy Creek is kept open in both models, so no savings is realized there. (In one model, it remains KMS, in the other it becomes a neighborhood school so the overhead costs remain the same.)
Fifteen million a year in the centralized plan and 16 million a year in the decentralized plan are the estimated savings. Neither analysis estimates ongoing maintenance costs, which given the age of these buildings are probably not insignificant.
Here are the links to the documents: