Assuming it's in a good area, a 7.8% cap rate isn't too bad right now. When I buy a property, I include a vacancy rate and verify all expenses. Call the city to verify taxes, call the electric, water, trash, insurance, plowing and oil/gas companies to verify expenses. Find out if rates are going up for 2020. They probably used rates for 2019. Assume a % for repairs/maintenance and CapEx. Once you get the real NOI, offer around an 8% cap rate. Years ago I offered 10%, but that's hard to get now. At least interest rates are lower to make up for it so your cash on cash return should be good. I look at % returns, not a certain $ amount per door. Also, don't expect to make much cash flow the first year because inevitably something will come up. Also, make sure there's nothing holding back the rent increase - such as a lack of parking, extremely small rooms, etc. Once you have all your data confirmed, make your offer with confidence.