Utilize tools like BiggerPockets Rental Property Calculator and connect with local investors.

Consider utilities, internet, landscaping, and other expenses.

I would ensure utilities are transferred out of your name also.

If not, your case may be difficult to prove.They should take responsibility for the lawn, security, and utility abuse.

@John BertolonYou are in the customer service business.

In our24 years of experience, managing almost 100 S8 leases currently, the average S8 tenant has a FICO under 580, numerous collections from utility & cell phone companies, doesn't want to pay a security deposit, much less an application fee and claims they don't know how to fill out their S8 paperwork despite being in the program for several years - hint: they want YOU to do it for them.Most, not all, are eligible for government assistance due to a funeral-march of bad choices.REALITY: you are trust trading one set of problems for another.You can succeed with S8, but you need to understand the challenges and plan accordingly.

Rents were higher weekly, than if they paid monthly. 25 units in Knoxville, TN with a mix of cottages, duplexes and a six unit efficiency.We converted it to monthly renters, lowered expenses, billed back utilities  to the residents.

Purchase price: $1,150,000 Cash invested: $300,000 Sale price: $1,628,000 Built in 1890, this Old Victorian was converted into a duplex in the 70's by a talented architect who made some unique and extraordinary custom design choices (read vaulted skylights) that made this property truly one of a kind.

Also if he is just taking PITI into the equation, he is missing/withholding info about utility costs, stocking/supply costs, cleaning costs, etc. 

I think you covered a lot of things already I was going to say, especially amenities and customer avatar.