Frankfurt property tax

The property tax ("Grundsteuer") differs from town to town and can depend on various factors, so you better ask the local authorities there. However, it is generally low (usually a few hundred Euros per year for any property you own).

More impotant is the property sales tax ("Grunderwerbsteuer"), which is due at the time of purchase and amounts to 6% of the purchase price in Hessen and 6,5% in Brandenburg (both have a town called Frankfurt).

Since there are also transaction and registration fees, you should budget 10% of the purchase price (plus the agent fee, if one is involved) for associated costs, on top of the purchase price.