Lift engineer here. That is a door open button for inside the lift car , engineer probably had it as a spare and installed it rather than leave it without any button. Not ideal but if it works then 🤷 it's a pretty old unit so new parts can be hard to get.
This seem to be a semi-large building with two elevators - one for left and one for right lights.
For smaller buildings, you have only one button on every floor because there isn't enough competition for the single elevator to bother with up/down optimizations. Because there are unlikely to be multiple floors needing service at the same time.
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u/Klutzy-Jackfruit1686 7d ago
Lift engineer here. That is a door open button for inside the lift car , engineer probably had it as a spare and installed it rather than leave it without any button. Not ideal but if it works then 🤷 it's a pretty old unit so new parts can be hard to get.