Ok so you’ve seen my guide to tipping in general which covers most things, but it’s not super specific about the doorman in your building.
Did you know that you’re meant to tip them at all? Well now you do, and it’s kinda important. They do lots for you throughout the year without much more than a smile and thank you all year, so now is your time to repay (and just be nice, it’s the holidays).
Here’s a handy calculator for how much to tip! Thanks, Sarah L for the great link.
P.S. Tips are cash, not any other form.