All tours are free and open to the public. Walk in the 23rd street side and ask for a tour. I believe Monday-Friday 10am-5pm. Don't quote me on that. Midday should be fine. Full tour can take upwards of 2 hours(including library and all rooms).
Are they still giving tours in 2021
Tours are open to anyone and free 10 to 2
You should check out the info page here: https://nymasons.org/site/hall-tours/
Tours are free. And for non-masons too. Of course. Pictures of the rooms on the net, everywhere.
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