In response to your draft letter, I have no comment/no comments.
Following discussion of all agenda's items, the Board meeting ended at 1pm as there were no other business/businesses.
You should use "no comments" in the first sentence.
In the second sentence, we use non-count "business" to mean "matters." "Businesses" usually means "companies." The typical collocation in meeting minutes is: ... as there was no further business to transact (= as there were no other matters to deal with).
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