Meaning, if there are no properties in your neighborhood and surrounding areas with a finished basement it would be extraordinarily difficult to estimate any value from your basement. 

Next up I believe to make sure when you run your numbers you get an accurate repair estimate and ARV then negotiate the best price for you from there. 

But if you do then include the estimated cost of monthly utilities into your rent that these companies are paying.You can write that tenants should keep the AC at a certain level but there's no guarantee any of them will do this. 

., $500k property requires ~$2500 rental income to breakeven):Unless your rent is real high, the cap ex/maintenance will be significantly higher than you estimated. 

4 - What would you estimate for average monthly power, gas, water, and trash (I know, this is going to be a wide range depending on # of occupants, climate sensitivity factors, etc)?

The rent is the market rate (in fact $50 less than the Zillow estimate) but still no luck.

Also, where could I find good estimates for property tax for 2022?

Based upon your numbers:Rent $950/month x 12 = $11,400Prop Tax $100/month x 12 = $1200 (this is just an estimate as you didn't supply!)

There was apparently supposed to be a tax abatement applied to the property but it never was so my taxes are a lot higher than what was estimated at closing.

I am not really sure what should be included in the expense estimates.