Betriebskosten (Nebenkosten)
Running costs of a building that the landlord passes on to tenants.
Heating, water, waste, caretaker and more. Once a year comes the statement; objections are possible until the end of the twelfth month after receipt (§ 556 Abs. 3 S. 5 BGB).
How it appears in the letter
»Betriebskostenabrechnung für den Zeitraum …«