On top of it, you pay the society's upkeep charge separately, which covers staff, security, lifts, water and common area power. Landlords quote rent this way because the society sets and can change the maintenance amount, not the owner. Ask the landlord for last month's maintenance bill before you sign, so the real monthly outgo is clear to you from day one.
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Sources
No outside source: this is how the practice works, in words, with nothing to cite.