OP here. In our somewhat sprawled out complex of 10 buildings at one location and several buildings up the road, there are no doormen. Maintenance did repair my refrigerator for me when the fan went out, but they don't do small things such as help fix a broken toilet seat, put the screen back on the rails of the slider when the dog pushes it out, or affix the dishwasher tabs so the machine doesn't fall out of the cabinet when the bottom rack is pulled out. These last three things I just dealt with myself--it isn't that I couldn't do it--but I didn't have my tools, and had to buy a couple things to effect the repairs. Not a biggie...but for this I'm going to give a yearly tip? Also, maintenance leaves a snow shovel and a bucket of rock salt in our entryways--they tell us we don't have to shovel the snow, but the complex is large, and they can't get to everybody first thing. So the reality is that we do shovel ourselves out the door and down the stairs to our vehicles, and salt our own stairs and sidewalks. Again, not a biggie, but it's not that helpful, either. And I keep my own snow shovel--better than theirs--and my own bag of rock salt, because theirs always runs out. The rental manager treats me with business courtesy and nothing more--she is not warm or schmoozy--and I see her at most once a month if she is in the office when I drop off the rent.
I am not cheap about tips--I pretty much tip people it's generally agreed we should--such as waitstaff in restaurants. (Not that I eat in restaurants much.) Just felt a little puzzled about apartment etiquette, and don't like to ask other residents, as I'm sure replies would differ widely...I'm sure some genuinely couldn't afford to tip if they wanted to.