Church finances: What do you know?

What is the largest expense in our church budget?

It is the rental costs of the flat at 12 avenue de la Forêt Noire at 1800 € per month (21 600 € per year).  This is not only the home for our priest and his family; it also serves as an essential church office base, the legal siège de l’association cultuelle and for various church activities.