As an NYPL staffer and Hacker News junkie, I can't tell you how much I appreciate seeing this listed here.

Before I joined the library, I'd come here all the time just to get work done. Now I come here to work.

Anyway, if you go a few blocks south to the Science, Industry, and Business Library (34th & Madison Ave) there's access to tons of market research databases that have helped fill out many of my friends pitch decks.