basement reno: permit signoff needed?

So we obtained a permit to do basement work in our home, in brooklyn. we didn’t go exactly by the architect’s plans however, we did more work than permitted by the plans.

But, since our home doesn’t have a C of O, will that matter? Say a few years from now I wish to sell the building, will the new buyers have problems getting a mortgage? No, right, since there’s no C of O anyway?

The permit to do the reno expires in a few months. Should I have the architect sign off on the permit anyway, to keep the city from calling me and finding out that I did more work than allowed by the permit?

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