Payment for Building Maintenance for a Separate Apartment

We live in a building where our apartment is built on the roof with stairs that are not connected to the building and were built in the apartment below (our apartment is relatively small compared to all the other apartments). We wanted to ask if we are allowed to demand from the building committee to clean the stairs up to our apartment even though we are the only ones living on the floor. Another question: In our building, the divided apartments pay half. Our apartment is 2.5 rooms with large balconies. Do we need to pay the full building maintenance fee [we are a couple with a child]?

Hello 

A. It is not possible to require the building committee to clean the stairs.

B. The rule is that any apartment from 50 square meters and above pays like a regular apartment. 

According to the instructions of the Gaon, Rabbi Amram Fried, shlita

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