If it's December, it's time to think about holiday tips. A few years ago, we looked at the Holiday Tipping Guidelines from Tipping.org, where the guidelines were fuzzy lines. We came up with this advice:

The site's advice is not concrete - the word "depends" appears twice in only a few sentences - but it's a good place to start. It advises anywhere from $25 to $100 for each of your doormen and $30 to $100 for your super. That's a wide range, but what you decide to give will, um, depend on the amount of service you receive. So, start with a base of $25 and build from there. If one doorman is especially helpful - he brings your packages to your apartment door or quietly ushers in your mistress, for example - add a little more money for him. And if your super has been to your apartment to unclog the toilet or do other repairs in the past year, throw a few extra bucks his way.

Don't forget that your building's staff goes beyond the men and women who open your front door or hand your your dry cleaning. Valets, porters and other mainentence staff are also worthy of tips at this time of year. A base of $20 - $30 is a good place to start. You can work up from there, um, depending on the type of building in which you live.

You can ask your neighbors if you feel comfortable to get an idea of what other building residents generally give. But don't feel that you have to break the bank to keep up with the Joneses. As with any responsible gift giving, you'll have to balance your gratitude with your finances.

Of course, our readers had some good suggestions as well.

Naturally, New York is very different, with some building supervisors even sending their residents holiday tipping guidelines, as Curbed found. New York magazine polled various building employees, personal trainers, nannies and more to find out about holiday tipping guidelines.