After all units are rented, it will bring in 3600 a month gross income.

And depending on the state, gross negligence damages can include punitive damages for up to four times actual damages. 

And hiring a property manager will cost you 20-40% of your gross.  

If your objective is a given gross profit then you may be forced into doing higher risk, but less competitive and higher profit flips to achieve your goal. 

He said that it’s unsanitary and gross to place TP in waste basket and that I should have included that in the lease that can’t flush TP.

I checked AirDNA, and there is a comparable nearby that grosses $80k annually.

This strategy can help reduce utility expenses.Mid-term and short-term rentals can have utility costs up to 10% of gross income, including electricity, water, gas, cable, lawn care, and pest control.

Then it's gross income minus every expense that equals the NOI.

Here's kinda what I have: (I usually really front load properties with alot of repairs and painting so that it pushes alot off into the future)+ Gross rent- property management 10%- vacancy rate 5%- cap ex savings (250/ month?)

So I started testing it out with specific addresses and potential gross rental income and was blown away how it was exactly the gross income that the market offered.