from the MSBA website:

Templeton Center School - building complete.

MSBA paid to date - $21,137,638.00

MSBA remaining - $1,623,141.00

Total project budget - $45,058,033.00

These figures show the Town cost of project is $22,297,254.00 + borrowing / bonding costs.

Looks more like a 50% rate from MSBA rather than the ole 63.11% and you may confirm these numbers at MSBA web page.