On the first floor of the Central Library’s Boylston Street Building, a modern and inviting space built in 1972 and renovated in 2016, people are browsing for books, working on laptops, and sipping macchiatos from the library’s Newsfeed Café, which sits just a few feet from the ground-floor radio studio built and operated by GBH. It’s 10 o’clock on a bright summer morning, and the Boston Public Library-175 years old and more vital and necessary than ever-is up and running, doing all the things that public libraries do, offering all the things that public libraries offer. Photo by Aram Boghosian for the Boston Public Library The BPL’s historical Central Library in Copley Square, the crown jewel of the system.