What is the ruling on refraining from paying the cost of shared services (elevator maintenance, electricity bill, cleaning) in a multi-apartment building, while benefiting from these services?

If the beneficiary benefits from the shared services, he must pay their value, and it is not permissible for him to refrain from doing so. As for someone who does not benefit from them, he is not obligated to pay unless he has contracted for that, or if the services are necessary for the building's upkeep. One who refuses to pay the costs of maintaining shared property is compelled to do so if there is a need for it.