If he already has the donation confirmed and secured he should announce it asap.
Depending on the size of it, it could motivate others to donate for the project sooner rather than later. And of course the sooner the fund raising is done the sooner the project can start.
As to how it would get built, it does say in the BoR proposal that it will be a cost savings to do the upper deck at the same time and the lower.
You would not get that savings if the contractors had to pack up and clean up for a year and come back. I would guess it could be completed in a offseason.
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