On Fifth Avenue stands a gem of a library. No, not the “one with the lions” that’s diagonally across from this other one, formerly known simply the Mid Manhattan Library, which had been going downhill in terms of its architecture, design and functionality for quite some time. Then it closed for renovations and I pretty much forgot about it. Until a week or so ago when it reopened. The completely resurrected and renovated Mid-Manhattan Stavros Niarchos Foundation Library is dramatic, bold and sun-filled. And, the rooftop terrace and soon-to-open cafe/coffee shop are the icing on the cake.