Investors & landlords

There are 2 structures on the property, a house in the front, and a building that has 3 separated units in it.  When we bought it, all 4 homes were rented. We have always lived in the front house and only rent the 3 units in the back. However, we only receive 1 property tax bill for the entire property. The tax preparer we had didn't put us down as living in a rental and only put a percentage of expenses that were not separated on the Schedule E, but never gave us the QBI deduction.  This is why I am confused.