A collection agency needs a legal basis on which to try to collect. 

(a) Notwithstanding Section 65852.2, a local agency may, by ordinance, provide for the creation of junior accessory dwelling units in single-family residential zones.

Hi Nicholas,I am looking to start an agency where I help property managers operate more efficiently and more profitably. 

Do different agency lenders have different spreads and interest rates?

Now the buyer's agent will get a Buyer Agency Agreement that details out the minimum compensation they will accept. 

The collection agency reports them to the credit reporting agencies, dinging the tenant's credit and showing the collection to anyone that runs a credit check on them.

This is not legal advice please consult with you attorney).Consider a step-by-step process increasing the pressure on the tenant with each step while accumulating documentation (which will be needed in Eviction Court):As per the prior comment, first contact the State Agency sponsoring/funding the Section 8 payments and document for them all the issues to see if a resolution can be reached.

It has helped me to network around and have multiple investors and even real estate agencies I can call to work out a deal with first. 

We haven't tried to work with any agencies yet, haven't needed to.

His average contract value is around 15-20k and his profit margins on these jobs are roughly 50%.I don't have an agency or any sort of business that provides this service.