Regarding payment of lift maintenance cost

Respected Sir/ Madam, I have purchased a flat in a small complex in South Kolkata in 2010. The complex has not got Completion Certificate / CC yet and there is no Housing Society. The complex has 2 buildings: Building A has 3 floors and Building B has 4 floors with a Lift. In 2012, CESC took away the Lift's Meter as the power charges were due for long time. Its been 6 years that the lift is left unused. Now we want to repair the lift and arrange power supply for it . But flat owners of Building A has refused to contribute any money since the lift is not in their building. And in Building B , the landlords & flat owners of 1st floor have refused to contribute any money for lift . Please suggest , what is the correct rule :- Q1> Should Building A's flat owners contribute for lift maintenance ? Q2> Is it right that , the landlords and 1st floor owners of Building B won't contribute for lift maintenance ?