Rate will be highly dependent on loan size, credit score, LTV, location, and property type, as well as a few other factors.

You said "100% of our funds were investors" then "my capital came from bank Lines of credit NO investors", so wondered exactly how much of the 100% was replaced. 

Run a credit/screening report on yourself.

I would like to learn more about seller financing, I see a lot of information on the internet about seller financing but honestly I am just confused.

This is the max it seems most "A" lenders will loan too, I might get 50% from a credit union but that still probably not help in the short term.How do people keep going?

. :)  these are not credit score loans ( I mean I have a credit score) but thats just a formality its all about capital and relationships with your bankers and deposit relationships thats key as well.Yes your relationships with sub contractors will be a huge factor in profitability, both direct and indirect. 

I'm wondering if a BLOC could help to build my business credit.

Developers will not be able to get these bonus building permits without providing such TDR credits.  

Many community banks will give you credit for proforma rents.  

You definitely want to use a thorough screening method like rentprep.com that gets their income, credit, background check, and call at least 3 references (make sure to verify them by address/job and then their name).