12 Units/insurance estimates

[Shea Spinelli]

We're in negotiations to purchase our first property and its 12 units on 2 acres, low to moderate income houses and duplexes. I'm trying to estimate insurance cost and the current owner has the insurance below value. The property has been paid off for a long time, so I can't use his as an estimate. Mine will be higher for sure. His is roughly 1900/year, paid in full. What options do I have and what's a good estimation to calculate so I don't short myself on the net cash flow? I want real expectations prior to owning the property. He may owner finance some and bank lend some if that helps.