Those normal expenses associated with the operation of a standard office building, including, but not limited to: utilities, janitorial service, consumable supplies, taxes, insurance, maintenance and repair, etc.
A lease in which the tenant is responsible for all expenses and real estate taxes associated with its proportionate share of occupancy of the building.
A rental rate that includes only certain services provided by landlord. The tenant is usually responsible for cost of utilities and janitorial services.
A rental rate that includes normal building services (e.g. utilities, janitorial, repairs, payroll, etc.) as provided by the landlord within the base year rental.