I am sure they are a good company that offers some great options but in all fairness if you are not using all of the banks and lenders in the US how can you say your are providing a customer with the best finance option?

Here's a detailed guide on how to screen applicants: Application Screening Guide 

They use financing. 

.✅ Professional Tenant Screening – Property managers have systems in place to screen applicants thoroughly, reducing the risk of bad tenants.✅ Knowledge of Chicago Rental Laws – A good property manager stays up to date on local laws, helping you avoid costly legal mistakes.✅ Maintenance & Repairs Handled – No more emergency calls at 2 AM about a broken water heater!

Often times, their approval processes are slow.Credit Unions - Their member structure also subsidizes their financial structure so they can also be a source of low-cost financing.

One with low cash, one with some owner financing and a little less price. 

However, without significant updates, they’re likely to reject your application outright without leniency. 

My issue is, it's been almost 3 months and I haven't be able to get good tenant applicants.

Challenge is where is their motivation to properly screen applicants and get rid of nonpayers?

but, my my first question with these posts is why can you not use conventional financing anymore?