Monthly common expenditure for an apartment.

Q: Can some one please post any details on any kind of analysis done on the monthly common expenditure for an apartment? So that looking at that report any new committee can visualize how much could be their apartments monthly common expenditure.

For example, for an apartment with 6 floors (60 flats) and having amenities like 2 lifts, a generator backup, 2 security guards, 2 bore wells, 2 watchmen what would be the monthly expenditure?

a. Expenditure towards electricity (common lighting, borewells, lifts).
b. Expenditure towards fuel for generator.
c. Expenditure towards salary for 2 security and 2 watchmen.
d. Expenditure towards servicing of the lifts, borewells and generator.

Thanks in advance.

Venkat